Layered sand prevention and layered water injection real-time measurement and control tubular column and measurement and control device and construction method thereof

Abstract

The invention discloses a layered sand prevention and layered water injection real-time measurement and control pipe column and a measurement and control device and a construction method thereof. The layered sand prevention and layered water injection real-time measurement and control pipe column comprises a layered sand prevention pipe column and a cable real-time measurement and control separate injection pipe column. The cable real-time measurement and control separate injection tubular column is provided with underground equipment, and the underground equipment is arranged in the layered sand prevention tubular column. The underground equipment comprises a well completion oil pipe, small-diameter bridge type intelligent injection allocator and annular packers, at least two groups of small-diameter bridge type intelligent injection allocator and annular packers are arranged on the well completion oil pipe, and the annular packers in each group are arranged above the small-diameter bridge type intelligent injection allocator; and a water nozzle regulation and control assembly is arranged in the small-diameter bridge type intelligent injection allocation device and is used for regulating and controlling the water injection rate. According to the small-diameter bridge type intelligent injection allocation device, automatic testing and adjusting of all layers can be achieved, and extra instruments do not need to be put into the injection allocation device; the structure size can be normally put into the sand filter pipe, and the outer diameter of a common water distributor cannot be put into the sand filter pipe.

Description

Technical Field

[0001] The invention relates to the technical field of underground water injection in oil exploitation, in particular to a real-time monitoring and control pipe column for layered sand prevention and layered water injection, a monitoring and control device and a construction method thereof. Background Art

[0002] Shengli offshore oilfield is a high-porosity, high-permeability, sand-prone reservoir. The injection wells mainly adopt the separate prevention and injection process, first mechanical sand prevention, then separate injection completion. With the gradual deepening of multi-level subdivision and efficient development of offshore oilfields, the existing process has obvious constraints: it cannot meet the development needs of frequent dynamic regulation, and cannot realize the automatic monitoring of stratified water injection pressure, temperature, and flow; it is difficult to lower and dock the existing measurement and adjustment instruments in highly inclined wells, and it is easy to get stuck, so that the measurement and adjustment work cannot be carried out smoothly, resulting in difficulty or inability to inject in some inclined wells; the measurement and adjustment of offshore oilfields is costly and difficult, and is easily affected by sea conditions and weather. The measurement and adjustment cycle is long, which affects the development effect.

[0003] Cable real-time measurement and control injection technology can realize real-time testing and remote control of downhole production parameters. The current process is only suitable for injection in 5-1 / 2in and above casing, and cannot meet the requirements of intelligent injection in 5in sand control pipes in offshore oil fields.

[0004] Publication (Announcement) No.: CN108999576B, discloses an integrated pipe column and process for sand control by water injection. The integrated pipe column is located in the casing, and includes at least one section of water injection sand control pipe column connected from the wellhead downward through the oil pipe; the water injection sand control pipe column includes a water distributor, an upper sand retaining packer, a sand control pipe and a lower sand retaining packer connected in sequence from top to bottom; wherein the water distributor is connected to the upper sand retaining packer through the oil pipe; the sand control pipe includes a central pipe, an outer pipe and a metal felt mesh located outside the outer pipe, an annular cavity is provided between the central pipe and the outer pipe, and a flow hole is provided on the outer pipe; the upper sand retaining packer and the lower sand retaining packer are both provided with a flow channel for connecting the annular cavity of the sand control pipe with the annulus of the oil casing; the upper sand retaining packer and the lower sand retaining packer are respectively located at the upper and lower ends of the oil layer, and a closed sand control space can be formed between the upper sand retaining packer, the lower sand retaining packer, the outer pipe of the sand control pipe and the casing. The use of the pipe string can effectively prevent the water injection pipe string from being buried by sand, thereby increasing the working life of the water injection pipe string.

[0005] The prior art uses a common injector, which cannot meet the requirements of intelligent injection in the sand control pipe of offshore oil fields.

[0006] Publication (Announcement) No.: CN112709555B, discloses a water injection well high-efficiency divided prevention and injection pipe string and construction method, including: a sand control pipe string and a water injection pipe string, wherein the sand control pipe string includes at least two sand filter pipes arranged on the casing from top to bottom and corresponding to different oil layers, and sand control and water injection high-efficiency packers are arranged between the two sand filter pipes, above the top sand filter pipe, and below the bottom sand filter pipe; the water injection pipe string includes at least two adjustable water distributors arranged on the oil pipe from top to bottom and corresponding to different oil layers, and hydraulically controlled stratified packers are arranged between the two adjustable water distributors, above the top adjustable water distributor, and below the bottom adjustable water distributor. The sand control and water injection pipe string is lowered once, saving construction time, and then the hydraulically controlled pipeline is pressurized once to realize the setting of all packers. During the production process, all hydraulically controlled stratified packers are unsealed, which can clean the blasthole and reduce the water injection pressure. There is no risk of salvage in the later operation.

[0007] The prior art uses a common injector, which cannot meet the requirements of intelligent injection in the sand control pipe of offshore oil fields.

[0008] Publication (Announcement) No.: CN201679489U, discloses a dual-tube separate injection safety production string, including a ground control system, a hydraulic control pipeline, an annular space safety valve, an annular space packer, a positioning injection valve, a sealing plug, a string, an injection safety valve, a layered packer, an injection valve, a plug, a bottom sand filter, an anchor, a sand control packer, a sand control screen, a sand control string, a casing string and a water injection string, wherein the upper part of the water injection string is installed in the casing string, and the lower part is installed In the sand control column, the sand control column is installed in the casing column, the upper part of the sand control column is equipped with a hanging packer, the middle part is equipped with a sand control screen pipe and an injection layer packer, the lower part is equipped with an anchoring device and a bottom sand filter pipe and a plug, and the water injection column is sequentially equipped with an annular space safety valve, annular space packer, positioning injection valve, sealing plug, injection safety valve, injection layer packer, injection valve and plug, and the annular space safety valve is connected to the ground hydraulic control system by a hydraulic control pipeline. This existing technology has the characteristics of convenient and accurate deployment, large injection and distribution diameter, no risk of fishing, safe production, low shear and environmental protection, and is widely used in the stratified water injection process of oil production.

[0009] The prior art uses a common injector, which cannot meet the requirements of intelligent injection in the sand control pipe of offshore oil fields.

[0010] In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the beneficial effects produced are all different from the present invention. Regarding more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the invention

[0011] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a real-time measurement and control pipe string for layered sand control and layered water injection, a measurement and control device and a construction method thereof, so as to meet the needs of intelligent injection in a 5in sand control pipe in offshore oil fields.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] The real-time measurement and control string for layered sand control and layered water injection includes a layered sand control string and a cabled real-time measurement and control injection string;

[0014] The cable real-time measurement and control injection string is provided with downhole equipment, and the downhole equipment is arranged in the layered sand control string;

[0015] The downhole equipment includes a completion tubing, a small-diameter bridge-type intelligent injector, and an annulus packer. The small-diameter bridge-type intelligent injector and the annulus packer are arranged in at least two groups on the completion tubing, and the annulus packer in each group is arranged above the small-diameter bridge-type intelligent injector.

[0016] The small-diameter bridge-type intelligent dispenser is provided with a water nozzle regulating component for regulating the water injection volume.

[0017] The layered sand control pipe string includes a hanging and dropping packer, a sand control casing, a sand filter pipe string, a large-diameter packer, a large-diameter hydraulic slip, and a casing thread plug;

[0018] The large-diameter packer, the sand filter pipe string, and the large-diameter hydraulic slip are arranged on the sand control casing; at least two sand filter pipe strings are arranged on the sand control casing, and each sand filter pipe string corresponds to an oil layer; a large-diameter packer is arranged between every two sand filter pipe strings;

[0019] The large-diameter hydraulic slips are arranged at the bottom of the sand control casing;

[0020] The casing plug is arranged at the lower end of the sand control casing;

[0021] A hanging and releasing packer is arranged at the upper end of the sand control casing, and at least two groups of rubber cylinders and bidirectional slips are arranged on the hanging and releasing packer.

[0022] The sand filter pipe string is composed of sand filter pipes of different lengths connected together, and the length of the sand filter pipe string is greater than the thickness of the oil layer.

[0023] Wellhead equipment is also provided, including a water injection wellhead through which a cable can pass, a flow automatic controller, and a ground control cabinet;

[0024] The lower end wellhead of the water injection wellhead that can pass through the cable is connected to the upper end of the completion oil pipe;

[0025] The flow automatic controller is arranged at a detection port which can pass through the cable water injection wellhead;

[0026] The ground control cabinet is installed outside the wellhead, and a data acquisition control system is integrated in the cabinet.

[0027] The downhole equipment also includes a downhole safety valve, an electro-hydraulic composite control packer, an anti-creeping sealed packer, and a sand-proof bottom sealing device arranged on the completion oil pipe;

[0028] The downhole safety valve is arranged below the wellhead;

[0029] The cable annular safety packer is arranged between the downhole safety valve and the hanging release packer;

[0030] The number of the small-diameter bridge-type intelligent injection distributors is consistent with the number of sand filter pipe strings, and each small-diameter bridge-type intelligent injection distributor corresponds to one sand filter pipe string, that is, one water injection layer section;

[0031] The annular space packer is an electro-hydraulic composite control packer, and an electro-hydraulic composite control packer is arranged above each small-diameter bridge-type intelligent injector, and the electro-hydraulic composite control packer does not contact the sand filter tube string;

[0032] The anti-creep airtight packer is arranged below the lowest sand control pipe string;

[0033] The sand-proof bottom sealing device is arranged at the lower end of the completion oil pipe.

[0034] The anti-sand bottom sealing device includes a constant pressure sand settling well washing valve, a sand settling tail pipe, and a guide wire plug;

[0035] The constant pressure sand settling well washing valve is arranged at the lower end of the completion oil pipe; the sand settling tail pipe is arranged at the lower end of the constant pressure sand settling well washing valve; the guide wire plug is arranged at the lower end of the sand settling tail pipe, which is used to seal the bottom of the pipe column to make the oil pipe sealed as a whole.

[0036] The downhole equipment also includes a signal cable, a cable protector, a cable protection coupling, and a cable connector;

[0037] The signal cable is connected with the power supply line and signal line of the electro-hydraulic composite control packer and the small-diameter bridge-type intelligent injection device. The signal cable passes through the cable annulus safety packer and the cable-through water injection wellhead and then connects to the control cabinet to realize the two-way transmission of power supply and signal for the downhole device.

[0038] The cable protector is used to fix the signal cable on the outer wall of the completion tubing;

[0039] The cable protection coupling replaces the oil pipe coupling of the tool section in the sand control pipe, and is used to connect the segmented oil pipes of the completion oil pipe, and at the same time, the signal cable is passed through and fixed on the outer wall of the completion oil pipe;

[0040] The cable connector is used for connection and insulation sealing between the cable of an electro-hydraulic composite control packer and the cable of a small-diameter bridge-type intelligent injection dispenser.

[0041] The outer wall of the cable protection coupling body is provided with three centrally symmetrical through-going 'L'-shaped cable grooves;

[0042] The cable groove comprises a starting portion and a bent inner cavity, the signal cable is arranged in the bent inner cavity, and the fastening bolt is arranged at the starting portion, which can prevent the signal cable from falling off after being fastened.

[0043] The small-diameter bridge-type intelligent dispenser also includes a middle joint, a detection component, and a main control circuit component;

[0044] The upper outer wall of the middle joint is connected to an upper outer casing, and the lower outer wall is connected to a lower outer casing. The faucet control assembly and the main control circuit assembly are installed on the upper end surface of the middle joint;

[0045] The detection component comprises a sensor component and an electromagnetic flowmeter component, wherein the sensor component is installed on the upper end surface of the middle joint, and the electromagnetic flowmeter component is installed on the lower end surface of the middle joint.

[0046] The small-diameter bridge-type intelligent dispenser also includes a first upper joint, an inner casing, and a first lower joint;

[0047] The lower end of the inner casing is connected to the upper end surface of the middle joint by plugging, covering the water nozzle control component, the main control circuit component, and the sensor component;

[0048] The lower end of the first upper joint is connected to the upper end of the upper outer casing through an upper union, the upper end of the inner casing is inserted into the lower end surface of the first upper joint, and a liquid hole is arranged at the upper end of the inner casing to form an upper bridge type flow passage;

[0049] The upper end of the first lower joint is connected to the lower end of the lower outer casing through a lower union, and the upper end surface of the first lower joint is connected to the electromagnetic flowmeter assembly by plugging;

[0050] The middle joint is provided with an annular flow hole, which connects the annular space between the upper outer casing and the inner casing with the interior of the lower outer casing.

[0051] The sensor assembly includes an internal pressure test module, an external pressure test module, and a temperature test module;

[0052] The first upper joint side wall is provided with an upper cable sealing head, and the first lower joint side wall is provided with a lower cable sealing joint;

[0053] The control cables of the sensor assembly and the faucet regulating assembly converge to the main control circuit assembly, the control line of the main control circuit assembly is connected to the signal cable, and the signal cable passes through the small-diameter bridge-type intelligent dispenser through the upper cable sealing head and the lower cable sealing head.

[0054] The faucet control assembly includes a motor, a switch sleeve, a travel switch, an upper fixing sleeve, a transmission rod, and a lower fixing sleeve;

[0055] The motor is arranged at the upper end of the upper fixing sleeve, the motor output shaft is a lead screw, a threaded hole is arranged at the upper end of the transmission rod, the transmission rod is connected to the motor output shaft and is threadedly driven by the lead screw;

[0056] The lower end of the transmission rod is provided with an adjusting piston, the lower fixed sleeve is inserted into the middle joint, the upper end of the lower fixed sleeve is provided with a water outlet, and the lower fixed sleeve is provided with a lower sealing sleeve below the water outlet;

[0057] The transmission rod is provided with a pressure balance hole, the upper end of which is on the upper end surface of the transmission rod, and the lower end is arranged above the regulating piston; the side wall of the middle joint is provided with a water injection port corresponding to the water outlet;

[0058] The lower end of the fixing sleeve is fixed to the upper end surface of the middle joint by a fixing screw, and a displacement sensor is arranged on the side wall of the fixing sleeve to detect the number of rotations of the lead screw;

[0059] The fixing sleeve is provided with a through slot below the displacement sensor, an upper travel switch is provided at the upper end of the through slot, and a lower travel switch is provided at the lower end; a switch sleeve is provided on the lead screw, and the switch sleeve is located between the upper travel switch and the lower travel switch.

[0060] The electro-hydraulic composite controlled packer comprises a central pipe and an electric control mechanism and a setting mechanism arranged on the central pipe;

[0061] The outer wall of the upper end of the central pipe is connected to a second upper joint, the lower end of the second upper joint is extended to form an electric drive annulus with the central pipe, and the inner wall of the lower end of the extended part of the second upper joint is connected to a connecting ring;

[0062] The electric control mechanism is arranged in the electric drive annulus, and the upper end of the sealing mechanism is connected to the outer wall of the lower end of the connecting ring.

[0063] The electric control mechanism is composed of a drive motor, a transmission shaft, and a control piston;

[0064] The drive motor is arranged on the upper end surface of the electric drive annulus, the upper end of the transmission shaft is connected to the output shaft of the drive motor, and the lower end is threadedly connected to the inner wall of the control piston;

[0065] The central tube is provided with a spring seat below the connecting ring, a spring is provided on the spring seat, a closed ring is provided on the spring, a switch ring is connected to the inner wall of the closed ring, the upper end surface of the switch ring contacts the control piston, a control hole is provided on the switch ring, and a pressure transmission hole is provided on the central tube;

[0066] When the spring pushes the sealing ring against the lower end surface of the connecting ring, the control hole is located above the pressure transmission hole; when the piston sits on the upper end surface of the connecting ring, the control hole coincides with the pressure transmission hole.

[0067] The sealing mechanism comprises an upper retaining bowl, an isolation piston, a hydraulic cylinder, a high-strength rubber cylinder, and a lower retaining bowl;

[0068] The outer wall of the lower end of the connecting ring is connected to the upper end of the upper retaining bowl, an annular space between the upper retaining bowl and the center tube is provided with an isolating piston below the spring seat, an inner wall of the upper retaining bowl is provided with an anti-slip convex ring below the isolating piston, the lower retaining bowl is sleeved on the lower end of the center tube, and the high-strength rubber cylinder is provided between the upper retaining bowl and the lower retaining bowl.

[0069] The lower end of the central tube is connected to the inner wall of the second lower joint, and the lower retaining bowl is sleeved on the outer wall of the second lower joint through a retaining sleeve.

[0070] The second upper joint and the second lower joint are each provided with a cable sealing head connected with the signal cable.

[0071] A measurement and control device for real-time measurement and control of the pipe string for layered sand control and layered water injection, including a middle joint, a water nozzle control component, a detection component, and a main control circuit component;

[0072] The upper outer wall of the middle joint is connected to an upper outer casing, and the lower outer wall is connected to a lower outer casing. The faucet control assembly and the main control circuit assembly are installed on the upper end surface of the middle joint;

[0073] The detection component comprises a sensor component and an electromagnetic flowmeter component, wherein the sensor component is installed on the upper end surface of the middle joint, and the electromagnetic flowmeter component is installed on the lower end surface of the middle joint.

[0074] It also includes a first upper joint, an inner casing, and a first lower joint;

[0075] The lower end of the inner casing is connected to the upper end surface of the middle joint by plugging, covering the water nozzle control component, the main control circuit component, and the sensor component;

[0076] The lower end of the first upper joint is connected to the upper end of the upper outer casing through an upper union, the upper end of the inner casing is inserted into the lower end surface of the first upper joint, and a liquid hole is arranged at the upper end of the inner casing to form an upper bridge type flow passage;

[0077] The upper end of the first lower joint is connected to the lower end of the lower outer casing through a lower union, and the upper end surface of the first lower joint is connected to the electromagnetic flowmeter assembly by plugging;

[0078] The middle joint is provided with an annular flow hole, which connects the annular space between the upper outer casing and the inner casing with the interior of the lower outer casing.

[0079] The sensor assembly includes an internal pressure test module, an external pressure test module, and a temperature test module;

[0080] The first upper joint side wall is provided with an upper cable sealing head, and the first lower joint side wall is provided with a lower cable sealing joint;

[0081] The control cables of the sensor assembly and the faucet regulating assembly converge to the main control circuit assembly, the control line of the main control circuit assembly is connected to the signal cable, and the signal cable passes through the small-diameter bridge-type intelligent dispenser through the upper cable sealing head and the lower cable sealing head.

[0082] The faucet control assembly includes a motor, a switch sleeve, a travel switch, an upper fixing sleeve, a transmission rod, and a lower fixing sleeve;

[0083] The motor is arranged at the upper end of the upper fixing sleeve, the motor output shaft is a lead screw, a threaded hole is arranged at the upper end of the transmission rod, the transmission rod is connected to the motor output shaft and is threadedly driven by the lead screw;

[0084] The lower end of the transmission rod is provided with an adjusting piston, the lower fixed sleeve is inserted in the middle joint, the upper end of the lower fixed sleeve is provided with a water outlet, and the lower fixed sleeve is provided with a lower sealing sleeve below the water outlet; the side wall of the middle joint is provided with a water injection port corresponding to the water outlet;

[0085] The transmission rod is provided with a pressure balance hole, the upper end of the pressure balance hole is on the upper end surface of the transmission rod, and the lower end is arranged above the regulating piston;

[0086] The lower end of the fixing sleeve is fixed to the upper end surface of the middle joint by a fixing screw, and a displacement sensor is arranged on the side wall of the fixing sleeve to detect the number of rotations of the lead screw;

[0087] The fixing sleeve is provided with a through slot below the displacement sensor, an upper travel switch is provided at the upper end of the through slot, and a lower travel switch is provided at the lower end; a switch sleeve is provided on the lead screw, and the switch sleeve is located between the upper travel switch and the lower travel switch.

[0088] The construction method of the layered sand control and layered water injection real-time monitoring and control pipe string comprises the following steps

[0089] S1. Run the layered sand control pipe string:

[0090] Connect the large-diameter hydraulic slips, large-diameter packers, and sand filter pipe strings in sequence through sand control casings, connect the casing plugs at the bottom, and adjust the distance between the tools by using the number of sand control casings, so that the large-diameter packers are located near the barrier between the two oil layers, and the sand filter pipe string is facing the oil layer. Put the sand control pipe string in, and temporarily hang it at the wellhead of the workover by using the elevators;

[0091] S2. Run the layered sealing service string to complete the sealing:

[0092] The layered setting service string is lowered into the layered sand control string to complete the setting of the layered sand control string, and the layered setting service string is lifted out by releasing the hand;

[0093] S201, run the layered sealing service string:

[0094] The layered sealing tools are connected in sequence through the tubing and lowered into the sand control string. The threaded plug at the bottom of the sealing string contacts the threaded plug of the casing at the bottom of the sand control string to complete the positioning. The distance between the tools is adjusted by the number of tubing roots so that the choke is located directly opposite the large-diameter packer and large-diameter hydraulic slip on the sand control string. The expansion packer is connected above and below the choke and its position should be near the sand control casing above and below the large-diameter packer and large-diameter hydraulic slip. The length of the tubing short section is adjusted by calculation, and finally the distance compensator is lowered so that the top of the sealing service string and the top of the sand control string are connected to the hanging drop packer and transported into the well together through the tubing.

[0095] S202, Sealing:

[0096] After the string is lowered to the designed depth, hydraulic pressure is applied through the tubing, and the rubber tube of the expansion packer on the sealing service string expands and seals on the inner wall of the sand control casing. The two sets of expansion packers will form a relatively closed space inside the sand control casing. After the hydraulic pressure continues to rise and reaches the throttle opening pressure, the throttle water outlet will open, and the pressure in the sealing service string will be transmitted to the closed space. When the pressure in the closed space reaches the rated sealing pressure of the large-diameter packer and the large-diameter hydraulic slip, the sealing mechanism placed inside the tool starts to work. Under the action of hydraulic pressure, the rubber tube of the large-diameter packer is compressed and expanded, and the slip teeth of the large-diameter hydraulic slips are extended, and both are anchored on the inner wall of the wellbore; while this process is working, the setting mechanism inside the hanging and releasing packer in the same pressure system also starts to work, compressing and expanding the rubber tube, extending the two-way slip teeth, and anchoring on the inner wall of the wellbore, finally realizing the oil layer isolation and sealing and the upper and lower double metal support anchoring of the sand control pipe string; during the setting process of the sand control pipe string, the pressure must always be kept above the rated setting pressure value and maintained for a period of time;

[0097] S203, Throwing:

[0098] After the sand control string is set, the oil pipe is continuously pressurized to the opening pressure of the sliding sleeve, so that the seal of the water outlet hole of the sliding sleeve is separated from the sealing surface, and the setting service pipe string is connected with the formation to complete the pressure relief. After the pressure relief, the morning rubber cylinder of the expansion packer is automatically retracted and separated from the inner wall of the sand control casing; then a steel ball is put into the setting service pipe string, and the steel ball sits on the releasing ball seat inside the hanging releasing packer, and the oil pipe is hydraulically pumped to the rated releasing pressure of the hanging releasing packer, and the releasing mechanism inside the hanging releasing packer works, and the releasing anchor claw is separated from the internal connector of the packer, so that the sand control pipe string is separated from the setting service pipe string, and the setting service pipe string can be taken out by pulling out the oil pipe, and the sand control pipe string remains in the well, realizing the stratified mechanical sand control of the oil layer.

[0099] S3. Run the cabled real-time measurement and control injection string:

[0100] The various parts of the cable real-time measurement and control injection string are connected in sequence through the completion tubing, and the distance between the completion tools is adjusted according to the number of completion tubings, so that the positions of the electro-hydraulic composite control packer and the anti-creeping closed packer are near the sand control casing between the two groups of sand control pipe strings. The small-diameter bridge-type intelligent injector corresponds to each sand control section. The signal cable is connected to the small-diameter bridge-type intelligent injector and the electro-hydraulic composite control packer in sequence. The cable inside the sand control pipe is protected and fixed by a cable protection coupling. A cable protector is used to fix the cable to the outer wall of each tubing above the sand control section. A cable annulus safety packer and a downhole safety valve are installed at the wellhead. The completion tubing is connected to the wellhead, and the signal cable passes through the cable-through water injection wellhead and is connected to the ground control cabinet.

[0101] Run it into the layered sand control string, make the small-diameter bridge-type intelligent injector correspond to each sand control section, start the electro-hydraulic composite control packer to complete the setting;

[0102] S4, Layered Notes:

[0103] The sensor component in the small-diameter bridge-type intelligent dispenser collects the internal and external pressure and temperature values ​​of the downhole oil pipe, and the electromagnetic flowmeter component collects the incoming water flow data;

[0104] During water injection, the injection liquid flows into the upper bridge-type flow channel through the first upper joint, then enters the lower bridge-type flow channel through the annular flow port of the middle joint, and then enters the first lower joint; the injection liquid is divided into two in the first lower joint, one part enters the water inlet of the middle joint water nozzle regulating assembly through the measuring pipe inside the electromagnetic flowmeter assembly, and is injected into the corresponding oil layer from the water injection port after adjustment, and the other part flows to the next-level intelligent dispenser through the first lower joint;

[0105] According to the injection requirements of each layer, control instructions are issued through the ground control system to adjust the water volume of the intelligent injectors on each layer until the injection requirements are met.

[0106] During stratified injection, the sensor component in the small-diameter bridge-type intelligent injector collects the internal and external pressure and temperature values ​​of the downhole oil pipe. The internal pressure test module is connected to the upper bridge-type flow channel through the internal pressure hole to collect the internal pressure data of the oil pipe. The external pressure test module is connected to the casing through the external pressure hole to collect the annular pressure data of the oil pipe and the casing. The temperature test module collects temperature data; the internal conductive medium of the electromagnetic flowmeter component, that is, the injected water flows through the measuring pipeline to collect the incoming water flow data; the collected data is processed by the main control circuit component and uploaded to the ground control system through a cable.

[0107] In one embodiment of the present invention, the layered setting service string comprises an oil pipe, and the oil pipe is provided with a distance compensator, an oil pipe nipple, an expansion packer, a throttle, a sliding sleeve, a backwash valve, and a plug;

[0108] The oil pipe is provided with the same number of throttles as the sand filter pipe string, and each throttle corresponds to a large-diameter packer or a large-diameter hydraulic slip;

[0109] The expansion packer is arranged above and below each choke, and the expansion packer does not contact with the sand filter tube string;

[0110] The lower end of the hanging release packer is provided with an inner joint and an outer joint, the inner joint is connected to the setting service pipe string, and the outer joint is connected to the upper end of the sand control casing;

[0111] The distance compensator is arranged below the suspended release packer; the sliding sleeve is arranged at the lowest oil layer; the backwash valve is arranged at the bottom of the oil pipe; and the corresponding thread plug is arranged at the lower end of the oil pipe.

[0112] In one embodiment of the present invention, the electro-hydraulic composite control packer has two modes: mode 1: the packer is automatically set when water is injected, and automatically released when injection is stopped;

[0113] A101 packer setting: The ground control drive motor runs, and the control piston is pushed down through the transmission shaft. The control piston overcomes the resistance of the spring and pushes open the switch ring and the sealing ring, so that the pressure transmission hole is always kept open; during the water injection process, the packer setting mechanism is connected to the pressure in the center tube, and the hydraulic pressure pushes the isolation piston down to compress the hydraulic oil in the hydraulic cylinder. The hydraulic pressure generated by the hydraulic oil compression expands the rubber cylinder, realizing the automatic packer setting;

[0114] A102 unsealing: The control piston is always kept in the right position and does not move. The sealing mechanism and the center tube are always in pressure communication. When the injection is stopped, the pressure in the sealing mechanism is lower than the pressure in the hydraulic cylinder, and the isolation piston moves upward to release the pressure in the hydraulic cylinder. The rubber cylinder is automatically unsealed by depressurization.

[0115] In this working mode, the packer can be automatically set when water is injected and automatically released when injection stops.

[0116] Mode 2: The packer is automatically set by water injection and released by electric control;

[0117] A201 Setting: The ground control driving motor is running, and the control piston is pulled upward through the transmission shaft. Under the action of the spring force, the switch ring and the sealing ring are always in a closed and sealed state, and the pressure transmission hole is also kept closed; during the water injection process, the pressure in the center tube overcomes the resistance of the spring to push open the switch ring and the sealing ring, the pressure transmission hole is opened, the setting mechanism is connected with the pressure in the center tube, the hydraulic pressure pushes the isolation piston downward, compresses the hydraulic oil in the hydraulic cylinder, and the hydraulic pressure generated by the hydraulic oil compression expands the rubber tube to realize automatic setting of the packer; when stopping injection, the pressure in the center tube cannot overcome the spring force of the spring, and the switch ring and the sealing ring are instantly moved upward and closed. At this time, the setting pressure is still maintained in the setting mechanism, the isolation piston keeps compressing the hydraulic oil in the hydraulic cylinder, the rubber tube remains in an expanded state, and the packer is not unsealed when injection is stopped;

[0118] A202 unsealing: When the injection is stopped, the ground control drive motor runs, and the control piston is pushed down through the transmission shaft. The control piston pushes the switch ring and the sealing ring to open the pressure transmission hole, and the sealing mechanism releases pressure. If the pressure in the sealing mechanism is less than the pressure in the hydraulic cylinder, the isolation piston moves up to release the pressure in the hydraulic cylinder, and the rubber cylinder is automatically unsealed after the pressure is released;

[0119] In this working mode, the packer can be automatically set by water injection and automatically released by manual electric control.

[0120] In mode 1 or mode 2, when the rubber cartridge is damaged, the unsealing of the rubber cartridge fails, and the liquid in the wellbore is isolated by the isolation piston and cannot enter the interior of the tubing string, thereby ensuring the stability of the normal water injection pressure system inside the tubing string.

[0121] Compared with the prior art, the present invention has the following beneficial effects:

[0122] 1. It meets the requirements of real-time measurement and control of injection in the sand control pipe of the stratified water injection well. The matching small-diameter completion tool can meet the requirements of running into the sand control pipe; the stratified water injection pipe string can be inspected and replaced separately, which is convenient for later construction.

[0123] 2. The small-diameter bridge-type intelligent water distributor can realize automatic measurement and adjustment of each layer without the need for additional instruments. The variable-range electromagnetic flowmeter can meet the needs of differentiated water distribution at different flow rates and ensure accurate measurement of the flow at each layer. It has a self-settling sand flow test function to meet the long-term stable and accurate measurement of flow under complex water quality. The structural size can be normally lowered into the sand filter pipe, and it has the same functions as ordinary water distributors. The outer diameter of ordinary water distributors cannot be lowered.

[0124] 3. The electro-hydraulic composite controlled packer adopts an expandable rubber cylinder, and completes the setting and unsealing through electro-hydraulic composite control. The setting mechanism can realize a variety of setting and unsealing modes, and the packer can be stopped without unsealing. The isolation setting mechanism can ensure that the pipe string still has sealing ability when the rubber cylinder is damaged.

[0125] 4. The cable protection coupling body has three centrally symmetrical grooves, which can protect and fix the cable in the compact space of the sand filter tube. Its small diameter structural size design can be normally inserted into the sand filter tube, while ordinary cable protectors cannot be inserted. BRIEF DESCRIPTION OF THE DRAWINGS

[0126] Figure 1 It is a structural schematic diagram of a layered sand control column of a layered sand control and layered water injection real-time monitoring column of the present invention;

[0127] Figure 2 It is a structural schematic diagram of a layered setting service pipe column in a construction method of a layered sand control pipe column for layered sand control and layered water injection real-time measurement and control of the pipe column of the present invention;

[0128] Figure 3 It is a schematic diagram of the structure of the real-time measurement and control column for layered sand control and layered water injection of the present invention;

[0129] Figure 4 It is a structural schematic diagram of a small-diameter bridge-type intelligent dispenser of the measurement and control device of the present invention;

[0130] Figure 5 It is a schematic diagram of the structure of the water nozzle control component of the small-diameter bridge-type intelligent dispenser of the measurement and control device of the present invention;

[0131] Figure 6 It is a schematic diagram of the working principle of the electromagnetic flowmeter assembly of the small-diameter bridge-type intelligent dispenser of the measurement and control device of the present invention;

[0132] Figure 7 It is a structural schematic diagram of a cable protection coupling in a real-time measurement and control column for layered sand control and layered water injection of the present invention;

[0133] Figure 8 The structure and working schematic diagram of the electro-hydraulic composite control packer in the real-time measurement and control column for layered sand control and layered water injection of the present invention;

[0134] In the figure: 1. hanging and dropping packer; 2. sand control casing; 3. sand filter string; 4. large diameter packer; 5. large diameter hydraulic slip; 6. casing plug; 7. oil pipe; 8. distance compensator; 9. oil pipe short joint; 10. expansion packer; 11. throttle; 12. sliding sleeve; 13. backwash valve; 14. plug; 15. downhole safety valve; 16. signal cable; 17. cable annulus safety packer; 18. cable protector; 19. cable protection coupling; 20. Electro-hydraulic composite control packer; 21. Small diameter bridge-type intelligent injection device; 22. Completion tubing; 23. Cable connector; 24. Anti-creeping sealed packer; 25. Constant pressure sand settling well washing valve; 26. Sand settling tail pipe; 27. Guide wire plug; 28. Cable-through water injection wellhead; 29. ​​Flow automatic controller; 30. Ground control cabinet; 31. Upper cable sealing head; 32. First upper joint; 33. Upper union; 34. Upper bridge-type flow passage; 35. Upper outer casing; 36. Inner casing cylinder; 37, main control circuit assembly; 38, water nozzle control assembly; 39, sensor assembly; 40, middle joint; 41, electromagnetic flowmeter assembly; 42, lower bridge flow passage; 43, lower outer casing; 44, lower union; 45, first lower joint; 46, lower cable sealing head; 47, motor; 48, displacement sensor; 49, switch sleeve; 50, travel switch; 51, fixing screw; 52, pressure balance hole; 53, water outlet; 54, water inlet; 55, cable Groove; 56, fastening bolt; 57, second upper joint; 58, driving motor; 59, transmission shaft; 60, control piston; 61, switch ring; 62, connecting ring; 63, pressure transmission hole; 64, sealing ring; 65, spring; 66, upper retaining bowl; 67, isolation piston; 68, hydraulic cylinder; 69, center tube; 70, high-strength rubber cylinder; 71, lower retaining bowl; 72, retaining sleeve; 73, second lower joint; 74, upper fixing sleeve; 75, transmission rod; 76, lower fixing sleeve. DETAILED DESCRIPTION

[0135] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0136] Embodiment 1:

[0137] The invention provides a layered sand control and layered water injection real-time measurement and control pipe string and a measurement and control device and a construction method thereof, comprising a layered sand control pipe string, a layered sealing service pipe string, and a cabled real-time measurement and control injection pipe string.

[0138] The layered sand control column is shown in Figure 1The pipe string includes a hanging and dropping packer 1, a sand control casing 2, a sand filter pipe string 3, a large-diameter packer 4, a large-diameter hydraulic slip 5, and a casing thread plug 6.

[0139] The large-diameter packer 4 , the sand filter pipe string 3 , and the large-diameter hydraulic slips 5 are arranged on the sand control casing 2 .

[0140] At least two sand filter pipe strings 3 are arranged on the sand control casing, each sand filter pipe string 3 corresponds to an oil layer and is used to isolate formation sand; the sand filter pipe string 3 is composed of sand filter pipes of different lengths, and the length of the sand filter pipe string 3 is greater than the thickness of the oil layer.

[0141] A large-diameter packer 4 is arranged between every two sand filter tube strings 3 to isolate the oil layer.

[0142] The large-diameter hydraulic slips 5 are arranged at the bottom of the layered sand control pipe column. Through hydraulic control, the metal slip teeth are extended and anchored on the inner wall of the wellbore to support the layered sand control pipe column.

[0143] The casing plug 6 is arranged at the bottom of the layered sand control string, and is used for supporting and positioning the layered sealing service string and the cabled real-time measurement and control injection string.

[0144] A hanging and releasing packer 1 is arranged at the upper end of the sand control casing 2. At least two groups of rubber tubes and two-way slips are arranged on the hanging and releasing packer 1. The rubber tubes are compressed and expanded and the two-way slip teeth are extended through hydraulic control, and are anchored on the inner wall of the wellbore for hanging the layered sand control pipe column and sealing the oil layer.

[0145] See also Figure 2 A layered sealing service pipe is arranged in the layered sand control pipe string, and the pipe string includes an oil pipe 7, and the oil pipe 7 is provided with a distance compensator 8, an oil pipe short joint 9, an expansion packer 10, a throttle 11, a sliding sleeve 12, a backwash valve 13, and a wire plug 14.

[0146] The oil pipe 7 is provided with the same number of throttles 11 as the sand filter tube string 3, each throttle 11 corresponds to a large-diameter packer 4 or a large-diameter hydraulic slip 5, and the throttle 11 is opened at a fixed pressure to transmit hydraulic pressure to the large-diameter packer 4 and the large-diameter hydraulic slip 5 to seal them.

[0147] The expansion packer 10 is arranged above and below each throttle 11, and the expansion packer 10 does not contact the sand filter tube string 3; it is sealed on the inner wall of the oil pipe 7 to form a closed space, ensuring that the throttle 11 effectively transmits hydraulic pressure, and the hydraulic pressure can be increased to meet the rated setting pressure of the large-diameter packer 4 and the large-diameter hydraulic slip 5.

[0148] The lower end of the hanging release packer 1 is provided with an inner joint and an outer joint, the inner joint is connected to the setting service pipe string, and the outer joint is connected to the upper end of the sand control casing 2.

[0149] The distance compensator 8 is arranged below the suspended release packer 1 and is used to compensate for the length of the setting service string so that the layered sand control string and the setting string are integrated and connected together.

[0150] The sliding sleeve 12 is arranged at the bottom oil layer position and is used for depressurizing the entire service string after the sealing is completed.

[0151] The backwash valve 13 is arranged at the bottom of the oil pipe 7 and has the function of backwashing the well.

[0152] The corresponding thread plug 14 is arranged at the lower end of the oil pipe 7 to seal the layered sealing pipe string as a whole.

[0153] The layered sand control string and the layered sealing service string are transported together to a predetermined depth.

[0154] See also Figure 3 The cabled real-time measurement and control injection string includes wellhead equipment and downhole equipment;

[0155] The wellhead equipment includes a cable-traversable water injection wellhead 28, a flow automatic controller 29, and a ground control cabinet 30; the cable-traversable water injection wellhead 28 can enable the downhole cable to pass through the oil pipe hanger and pass through the upper flange, and has a pressure-bearing sealing function for the cable.

[0156] The flow automatic controller 29 is arranged at the detection port of the cable-penetrable water injection wellhead 28 to control the water injection volume of the entire well, and can cooperate with the small-diameter bridge-type intelligent injection device 21 to complete the calibration of the flow of each layer underground.

[0157] The ground control cabinet 30 is installed outside the wellhead, and a data acquisition control system is integrated in the cabinet to control the small-diameter bridge-type intelligent injection dispensers at each layer of the well, thereby realizing the ground control over the well.

[0158] The downhole equipment includes a completion tubing 22 and a downhole safety valve 15 arranged on the completion tubing 22, an electro-hydraulic composite control packer 20, a small-diameter bridge-type intelligent injector 21, a cable annular safety packer 17, an anti-creeping sealed packer 24, and a sand-proof bottom sealing device.

[0159] The downhole safety valve 15 is arranged at a distance of 100-150 meters below the wellhead, and is used for emergency closure when the production facilities are in abnormal conditions, so as to prevent blowouts and ensure the safety of oil and gas well measures and production.

[0160] The cable annular safety packer 17 is arranged between the downhole safety valve 15 and the hanging release packer 1, and belongs to the well control safety matching tool. When the pressure difference between the inside and outside of the oil pipe exceeds 0.8MPa during normal water injection, the packer rubber cylinder automatically expands and seals to protect the casing.

[0161] The number of the small-diameter bridge-type intelligent injectors 21 is consistent with the number of the sand filter pipe strings 3. Each small-diameter bridge-type intelligent injector 21 corresponds to a sand filter pipe string 3, that is, corresponds to a water injection layer segment, and is used to monitor and collect data on pressure, temperature, and flow of each layer, and control the injected water volume through the ground water volume control short section.

[0162] An electro-hydraulic composite control packer 20 is arranged above each small-diameter bridge-type intelligent injection device 21. The electro-hydraulic composite control packer 20 does not contact the sand filter tube string 3 and is used to isolate the water injection layer. The setting and release of the packer are completed by electro-hydraulic composite control.

[0163] The anti-creep airtight packer 24 is arranged below the lowest sand control pipe string 3 to balance the force on the pipe string and extend the service life of the pipe string.

[0164] The anti-sand bottom sealing device is arranged at the lower end of the completion oil pipe 22, and includes a constant pressure sand settling well washing valve 25, a sand settling tail pipe 26, and a guide wire plug 27;

[0165] The constant pressure sand settling well-washing valve 25 is arranged at the lower end of the completion oil pipe 22, and has the functions of well washing and sand settling. The formation return vomit falls into the tail pipe through the sand settling channel of the well washing valve, so as to avoid the valve ball being buried and causing the well washing to be blocked;

[0166] The sand settling tail pipe 26 is arranged at the lower end of the constant pressure sand settling well washing valve 25, and is used to deposit formation sand and other impurities to ensure the quality of water injection;

[0167] The guide wire plug 27 is arranged at the lower end of the sand settling tail pipe 26 and is used to seal the bottom of the pipe string to seal the oil pipe as a whole.

[0168] The downhole equipment also includes a signal cable 16, a cable protector 18, a cable protection coupling 19, and a cable connector 23;

[0169] The signal cable 16 is connected to the power supply line and signal line of the electro-hydraulic composite control packer 20 and the small-diameter bridge-type intelligent injector 21. The signal cable 16 passes through the cable annulus safety packer 17 and the cable-through water injection wellhead 28 and then connects to the control cabinet 30 to realize two-way transmission of power supply and signals for the downhole device.

[0170] The cable protector 18 is used to fix the signal cable on the outer wall of the completion tubing 22 .

[0171] The cable protection coupling 19 replaces the oil pipe coupling of the tool section in the sand control pipe and is used to connect the completion oil pipes 22. At the same time, the signal cable 16 is passed through and fixed on the outer wall of the oil pipe to ensure the safety of the signal cable 16 in the sand control pipe.

[0172] The cable connector 23 is used for connection and insulation sealing between the cable of the electro-hydraulic composite control packer 20 and the cable of the small-diameter bridge-type intelligent dispenser 21 .

[0173] It should be noted that the cable-traversable water injection wellhead 28, flow automatic controller 29, and ground control cabinet 30 are wellhead equipment, measuring equipment, and control equipment commonly used in a well site, and those skilled in the art are aware of this.

[0174] The specific usage of this embodiment is as follows:

[0175] S1. Run the layered sand control pipe string:

[0176] The large-diameter hydraulic slips 5, the large-diameter packer 4, and the sand filter pipe string 3 are sequentially connected through the sand control casing 2, and the casing thread plug 6 is connected at the bottom. The distance between the tools is adjusted by the number of sand control casings 2, so that the large-diameter packer 4 is located near the barrier between the two oil layers, and the sand filter pipe string 3 is facing the oil layer. The layered sand control pipe string is lowered and temporarily suspended at the wellhead of the well repair by using an elevator.

[0177] S2. Run the layered sealing service string:

[0178] The layered sealing tools are connected in sequence through the oil pipe 7 and lowered into the layered sand control pipe column. The bottom thread plug 14 of the sealing pipe column contacts the bottom casing thread plug 6 of the layered sand control pipe column to complete the positioning. The distance between the tools is adjusted by the number of oil pipes 7 so that the throttle 11 is located opposite to the large-diameter packer 4 and the large-diameter hydraulic slip 5 on the layered sand control pipe column. The expansion packer 10 is connected above and below the throttle 11, and its position should be near the sand control casing 2 above and below the large-diameter packer 4 and the large-diameter hydraulic slip 5. The length of the oil pipe short section 9 is adjusted by calculation, and finally the distance compensator 8 is lowered so that the top of the sealing service pipe column and the top of the layered sand control pipe column are connected to the hanging release packer 1 together, and are transported through the oil pipe 7 and lowered into the well together.

[0179] S3, Sealing:

[0180] After the string is lowered to the designed depth, hydraulic pressure is applied through the oil pipe 7, and the rubber tube of the expansion packer 10 on the setting service string expands and seals itself, and is sealed on the inner wall of the sand control casing 2. The two sets of expansion packers will form a relatively closed space inside the sand control casing 2. After the hydraulic pressure continues to rise and reaches the opening pressure of the throttle 11, the water outlet of the throttle 11 opens, and the pressure in the setting service string will be transmitted to the closed space. When the pressure in the closed space reaches the rated setting pressure of the large-diameter packer 4 and the large-diameter hydraulic slip 5, the pressure in the closed space will be transferred to the closed space. After the force is applied, the sealing mechanism placed inside the tool starts to work. Under the action of continuous hydraulic pressure, the rubber tube of the large-diameter packer 4 is compressed and expanded, and the slip teeth of the large-diameter hydraulic slip 5 are extended, and both are sealed and anchored on the inner wall of the wellbore; while this process is working, the sealing mechanism inside the hanging release packer 1 in the same pressure system also starts to work, compressing and expanding the rubber tube, extending the two-way slip teeth, and anchoring on the inner wall of the wellbore, finally realizing the oil layer isolation sealing and the upper and lower double metal support anchoring of the stratified sand control pipe column. During the stratified sand control pipe column sealing process, the pressure must always be kept above the rated sealing pressure value and maintained for a period of time.

[0181] S4, Lose Hand:

[0182] After the stratified sand control pipe column is set, since the set service pipe column is a closed pipe column, the expansion packer 10 cannot be unsealed even if the pressure is stopped. At this time, it is necessary to continue to pressurize the oil pipe 7 until the sliding sleeve 12 opens the pressure, so that the water outlet seal of the sliding sleeve 12 is separated from the sealing surface, and the set service pipe column is connected with the formation to complete the pressure relief. After the pressure relief, the rubber cylinder of the expansion packer 10 is automatically retracted in the morning and is separated from the inner wall of the sand control casing 2. Then, a steel ball is put into the set service pipe column, and the steel ball is seated on the release ball seat inside the hanging release packer 1. The oil pipe 7 is hydraulically pumped to the rated release pressure of the hanging release packer 1, and the release mechanism inside the hanging release packer 1 works, and the release anchor claw is separated from the internal connector of the packer, so that the stratified sand control pipe column is separated from the set service pipe column, and the oil pipe 7 can be pulled out to take out the set service pipe column, and the stratified sand control pipe column remains in the well, realizing the stratified mechanical sand control of the oil layer.

[0183] S5. Run the cabled real-time measurement and control injection string:

[0184] The completion tools are connected in sequence through the completion oil pipe 22, and the distance between the completion tools is adjusted by the number of completion oil pipes 22, so that the positions of the electro-hydraulic composite control packer 20 and the anti-creeping sealed packer 24 are near the sand control casing 2 between the two groups of sand control pipe strings. The small-diameter bridge-type intelligent injector 24 corresponds to each sand control section. The signal cable 16 connects the small-diameter bridge-type intelligent injector 24 and the electro-hydraulic composite control packer 20 in sequence. The cable is protected and fixed inside the sand control pipe by a cable protection coupling 19. A cable protector 18 is used to fix the cable on the outer wall of each oil pipe above the sand control section. A cable annulus safety packer 17 and a downhole safety valve 15 are installed at the wellhead. The completion oil pipe 22 is connected to the wellhead, and the signal cable 16 passes through the cable-through water injection wellhead 28 and is connected to the ground control cabinet 30.

[0185] Embodiment 2:

[0186] This embodiment describes in detail the structure of the small-diameter bridge-type intelligent dispenser 21 in the pipe string described in Embodiment 1.

[0187] like Figure 4 As shown, the small-diameter bridge-type intelligent dispenser 21 includes an upper cable sealing head 31, a first upper joint 32, an upper union 33, an upper bridge-type flow channel 34, an upper outer casing 35, an inner casing 36, a main control circuit component 37, a faucet control component 38, a sensor component 39, a middle joint 40, an electromagnetic flowmeter component 41, a lower bridge-type flow channel 42, a lower outer casing 43, a lower union 44, a first lower joint 45, and a lower cable sealing head 46.

[0188] The connection method is:

[0189] Taking the fixed middle joint 40 as a reference, the main control circuit assembly 37, the faucet regulating assembly 38, and the sensor assembly 39 are all installed on the upper end surface of the middle joint 40.

[0190] The lower end of the inner casing 36 is connected to the upper end surface of the middle joint 40 by plugging.

[0191] The lower end of the upper outer casing 35 is externally threadedly connected to the upper end of the middle joint 40.

[0192] The upper end of the inner casing 36 is inserted into the lower end surface of the upper joint, and the lower end of the upper joint is connected to the upper end of the upper outer casing 35 through the upper union 33. The upper end of the inner casing 36 is provided with a liquid hole to form an upper bridge type flow channel 34.

[0193] The electromagnetic flowmeter assembly 41 is installed on the lower end surface of the middle joint 40.

[0194] The upper end of the lower outer casing 43 is externally threadedly connected to the lower end of the middle joint 40.

[0195] The upper end surface of the first lower joint 45 is connected to the electromagnetic flowmeter assembly 41 by plugging, and the upper end of the first lower joint 45 is connected to the lower end of the lower outer casing 43 through a lower union 44 .

[0196] The middle joint 40 is provided with an annular flow hole to connect the annular space between the upper outer casing 35 and the inner casing 36 with the interior of the lower outer casing 43;

[0197] The sensor assembly 39 includes an internal pressure test module, an external pressure test module, and a temperature test module.

[0198] The upper cable sealing head 31 is arranged on the side wall of the first upper joint 32, and the lower cable sealing joint 46 is arranged on the side wall of the first lower joint 45;

[0199] The control cables of the sensor assembly 39 and the faucet control assembly 38 converge to the main control circuit assembly 37. The control line of the main control circuit assembly 37 is connected to the signal cable 16. The signal cable 16 passes through the small-diameter bridge-type intelligent dispenser 21 through the upper cable sealing head 31 and the lower cable sealing head 46.

[0200] like Figure 5 As shown, the faucet control component 38 of the device also includes a motor 47, a displacement sensor 48, a switch sleeve 49, a travel switch 50, a pressure balance hole 52, a water outlet 53, a water inlet 54, an upper fixing sleeve 74, a transmission rod 75, and a lower fixing sleeve 76; the faucet control component 38 is installed on the upper end surface of the middle joint 40 by a fixing screw 51.

[0201] The motor 47 is arranged at the upper end of the upper fixed sleeve 74, the output shaft of the motor 47 is a lead screw, the upper end of the transmission rod 75 is provided with a threaded hole, the transmission rod 75 is connected to the output shaft of the motor 47, and is transmitted by the lead screw thread, the lower end of the transmission rod 75 is provided with an adjusting piston, the lower fixed sleeve 76 is inserted in the middle joint 40, the upper end of the lower fixed sleeve 76 is provided with a water outlet 53, and a lower sealing sleeve is provided below the water outlet 53; the transmission rod 75 is provided with a pressure balance hole 52, the upper end of the pressure balance hole 52 is on the upper end surface of the transmission rod 75, and the lower end is provided above the adjusting piston; the side wall of the middle joint 40 is provided with a water injection port corresponding to the water outlet 53.

[0202] The lower end of the upper fixing sleeve 74 is fixed to the upper end surface of the middle joint 40 by a fixing screw 51. The upper fixing sleeve 74 is provided with a displacement sensor 48 on the side wall to detect the number of rotations of the lead screw. The upper fixing sleeve 74 is provided with a through slot below the displacement sensor 48. The upper end of the through slot is provided with an upper travel switch, and the lower end is provided with a lower travel switch. The lead screw is provided with a switch sleeve 49, and the switch sleeve 49 is located between the upper travel switch and the lower travel switch.

[0203] Under the control of the main control circuit assembly 37, the motor 47 can rotate forward or reverse. The forward and reverse rotation of the motor 47 drives the lead screw to rotate in different directions, realizing the axial reciprocating motion of the switch sleeve 49. There is a travel switch 50 on each side of the switch sleeve 49. When the nut triggers the switch, the motor 47 will be powered off and the motor 47 will stop rotating, thereby realizing the water tap switch limit. The displacement sensor 48 measures the number of turns of the lead screw and can obtain the size of the water tap opening through conversion. The rotation of the lead screw causes the transmission rod 75 to move axially. An adjusting piston is installed at the lower end of the connecting rod. The axial movement of the adjusting piston is coordinated with the area of ​​the water outlet 53 to adjust the amount of water. The pressure balance hole 52 connects the upper part of the adjusting piston with the upper bridge-type flow passage 34. The pressure acts on the upper and lower ends of the adjusting piston at the same time and the force area is the same, realizing pressure balance, and ensuring that the adjusting piston is not affected by the high pressure underground when it is opened and closed underground.

[0204] like Figure 6 As shown, the electromagnetic flowmeter assembly 41 of the device is a prior art, and is mainly composed of an excitation coil, ferromagnetic material, electrodes, a measuring pipe, etc.

[0205] The electromagnetic flowmeter uses Faraday's law of induction to detect flow. It has the characteristics of large flow range ratio and small starting displacement. Inside the electromagnetic flowmeter, the conductive medium (injected water) flows through the measuring pipe, and the power supply provides current to the excitation coil. The excitation current flows through the coil to generate a magnetic field. The magnetic field acts on the conductive medium (injected water) to form an induced potential, and a voltage signal proportional to the flow rate is obtained from the electrode. Finally, the voltage signal is output by the converter as a unified DC signal to display the flow. When the inner diameter of the pipeline and the magnetic field strength are determined, the electromotive force captured by the electrode will also change as the flow changes. The electromagnetic flowmeter can change the range by changing the size of the excitation current, and realize the segmented flow measurement of large and small volume fine water injection. Those skilled in the art are clear about the use of the electromagnetic flowmeter assembly 41.

[0206] This embodiment describes in detail the test and adjustment method of the small-diameter bridge-type intelligent dispenser 21 described in Embodiment 3. Figure 4 , Figure 5 , Figure 6 .

[0207] The sensor assembly 39 in the intelligent dispenser collects the internal and external pressure and temperature values ​​of the downhole oil pipe. The internal pressure test module is connected to the upper bridge-type flow channel 34 through the internal pressure hole to collect the internal pressure data of the oil pipe. The external pressure test module is connected to the casing through the external pressure hole to collect the annular pressure data of the oil pipe and the casing. The temperature test module collects temperature data. The internal conductive medium (injected water) of the electromagnetic flowmeter assembly 41 flows through the measuring pipeline to collect the incoming water flow data.

[0208] During water injection, the injection liquid flows into the upper bridge-type flow channel 34 through the first upper joint 32, then enters the lower bridge-type flow channel 42 through the annular flow port of the middle joint 40, and then enters the first lower joint 45. The injection liquid is divided into two parts in the first lower joint 45, one part enters the water inlet 54 of the water nozzle regulating component 38 of the middle joint 40 through the measuring pipe inside the electromagnetic flowmeter component 41, and is injected into the corresponding oil layer from the water injection port after adjustment, and the other part flows into the next-level intelligent dispenser through the first lower joint 45.

[0209] According to the allocation requirements of each layer, control instructions are issued through the ground control system to adjust the water volume of the intelligent dispenser on each layer until the allocation requirements are met. The collected data is processed by the main control circuit component and uploaded to the ground control system via cable.

[0210] Embodiment 3:

[0211] This embodiment describes in detail the structure of the cable protection coupling 19 in the pipe column described in Embodiment 1.

[0212] like Figure 7 As shown, the cable protection coupling 19 includes a cable groove 55 and a fastening bolt 56;

[0213] In order to meet the requirements of the running-in size in the sand control pipe and ensure that the signal cable 16 can smoothly pass through the coupling, the outer wall of the cable protection coupling 19 is provided with three centrally symmetrical through-going 'L'-shaped cable grooves 55. The cable groove 55 includes a starting portion and a bent inner cavity. The signal cable 16 is arranged in the bent inner cavity. The fastening bolt 56 is arranged at the starting portion. After fastening, it can prevent the signal cable 16 from being detached, thereby completing the fixing and protection of the cable. The purpose of the three grooves is to prevent the upper tool from being misplaced and causing the cable to be entangled in the oil pipe. When in use, remove the tool section oil pipe coupling and replace it with the cable protection coupling 19, and place the signal cable 16 in the bent inner cavity.

[0214] Embodiment 4:

[0215] This embodiment describes in detail the structure and working method of the electro-hydraulic composite controlled packer 20 in the pipe string described in Embodiment 1.

[0216] like Figure 8 As shown, the electro-hydraulic composite control packer 20 includes a central tube 69 and an electric control mechanism and a setting mechanism arranged on the central tube;

[0217] The outer wall of the upper end of the central tube 69 is connected to a second upper joint 57, the lower end of the second upper joint 57 is extended to form an electric drive annulus with the central tube 69, and the inner wall of the lower end of the extended part of the second upper joint 57 is connected to a connecting ring 62;

[0218] The electric control mechanism is arranged in the electric drive annulus, and is composed of a drive motor 58, a transmission shaft 59, and a control piston 60; the drive motor 58 is arranged on the upper end surface of the electric drive annulus, the upper end of the transmission shaft 59 is connected to the output shaft of the drive motor 58, and the lower end is threadedly connected to the inner wall of the control piston 60, and can drive the control piston 60 to move up and down;

[0219] The central tube 69 is provided with a spring seat below the connecting ring 62, a spring 65 is provided on the spring seat, a sealing ring 64 is provided on the spring 65, a switch ring 61 is connected to the inner wall of the sealing ring 64, the upper end surface of the switch ring 61 contacts the control piston 60, a control hole is provided on the switch ring 61, and a pressure transmission hole is provided on the central tube 69;

[0220] The spring 65 pushes the sealing ring 64 against the lower end surface of the connecting ring 62. At the same time, the lower end surface of the control piston 60 does not contact the upper end surface of the connecting ring 62, the switch ring 61 is pushed up, and the upper end surface of the switch ring contacts the lower end surface of the control piston 60. At this time, the control hole is located above the pressure transmission hole 63; when the drive motor 58 drives the control piston 60 to sit on the upper end surface of the connecting ring 62, the switch ring 61 moves downward, the control hole coincides with the pressure transmission hole, and the sealing ring 64 detaches from the lower end surface of the connecting ring 62.

[0221] The sealing mechanism comprises an upper retaining bowl 66, an isolation piston 67, a hydraulic cylinder 68, a high-strength rubber cylinder 70, and a lower retaining bowl 71;

[0222] The outer wall of the lower end of the connecting ring 62 is connected to the upper end of the upper retaining bowl 66, and the annular space between the upper retaining bowl 66 and the center tube 69 is provided with an isolation piston 67 below the spring seat, and the inner wall of the upper retaining bowl 66 is provided with an anti-slip convex ring below the isolation piston 67, and the lower retaining bowl 71 is sleeved on the lower end of the center tube 69, and the high-strength rubber cylinder 70 is provided between the upper retaining bowl 66 and the lower retaining bowl 71;

[0223] The lower end of the central tube 69 is arranged on the inner wall of the second lower joint 73, and the lower retaining bowl 71 is mounted on the outer wall of the second lower joint 73 through the retaining sleeve 72.

[0224] The second upper connector 57 and the second lower connector 73 are each provided with a cable sealing head for connection with the cable.

[0225] Working principle: The electro-hydraulic composite controlled packer 20 realizes the opening and closing of the pressure transmission hole 63 by means of electric control, and utilizes two pressure systems of two media, namely, the hydraulic pressure in the pipe string and the hydraulic oil in the hydraulic cylinder 68, to complete the expansion or retraction of the high-strength rubber cylinder 70, thereby realizing the automatic setting and unsealing of the packer.

[0226] Specific working process:

[0227] Mode 1: The packer is automatically set when water is injected and automatically released when injection stops.

[0228] A101 Setting: The ground control drive motor 58 is running, and the control piston 60 is pushed down through the transmission shaft 59. The control piston 60 overcomes the resistance of the spring 65 to push open the switch ring 61 and the sealing ring 64, so that the pressure transmission hole 63 is always kept open. During the water injection process, the setting mechanism is connected to the pressure in the center pipe 69, and the hydraulic pressure pushes the isolation piston 67 downward to compress the hydraulic oil in the hydraulic cylinder 68. The hydraulic pressure generated by the hydraulic oil compression expands the rubber cylinder, and the packer is automatically set.

[0229] A102 unsealing: The control piston 67 is always kept in the right position, and the sealing mechanism is always in pressure communication with the center tube 69. When the injection is stopped, the pressure in the sealing mechanism is less than the pressure in the hydraulic cylinder 68, and the isolation piston 67 moves upward to release the pressure in the hydraulic cylinder 68, and the rubber cylinder is automatically unsealed by decompression. In this working mode, the packer can be automatically set when water is injected and automatically unsealed when injection is stopped.

[0230] Mode 2: Automatic setting of the packer by water injection and electric control of release mode

[0231] A201 Setting: The ground control driving motor 58 is running, and the control piston 60 is pulled upward through the transmission shaft 59. Under the spring force of the spring 65, the switch ring 61 and the sealing ring 64 are always in a closed and sealed state, and the pressure transmission hole 63 also remains closed. During the water injection process, the pressure in the central tube 69 overcomes the resistance of the spring 65 to push open the switch ring 61 and the sealing ring 64, and the pressure transmission hole 63 is opened. The setting mechanism is connected with the pressure in the central tube 69, and the hydraulic pressure pushes the isolation piston 67 downward to compress the hydraulic oil in the hydraulic cylinder 68. The hydraulic pressure generated by the compression of the hydraulic oil expands the rubber cylinder, and the packer is automatically set. When the injection is stopped, the pressure in the central tube 69 cannot overcome the spring force of the spring 65, and the switch ring 61 and the sealing ring 64 are instantly moved upward and closed. At this time, the setting pressure is still maintained in the setting mechanism, and the isolation piston 67 keeps compressing the hydraulic oil in the hydraulic cylinder 68. The rubber cylinder remains in an expanded state, and the packer is not unsealed when the injection is stopped.

[0232] A202 Unsealing: When the injection is stopped, the ground control drive motor 58 is running, and the control piston 60 is pushed down through the transmission shaft 59. The control piston 60 pushes the switch ring 61 and the sealing ring 64 to open the pressure transmission hole 63, and the setting mechanism is depressurized. If the pressure in the setting mechanism is less than the pressure in the hydraulic cylinder 68, the isolation piston 67 moves up, releasing the pressure in the hydraulic cylinder 68, and the rubber cylinder is depressurized and automatically unsealed. In this working mode, the packer can be automatically set by water injection, and the packer can be automatically unsealed by manual electric control.

[0233] In addition, the electro-hydraulic composite controlled seal 20 in this embodiment realizes two sets of pressure systems before and after the piston by setting an isolation piston 67. When the rubber sleeve is damaged during operation, the rubber sleeve unsealing fails, and the liquid in the wellbore is isolated by the isolation piston 67 and cannot enter the interior of the tubing, thereby ensuring the stability of the normal water injection pressure system inside the tubing.

[0234] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0235] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0236] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0237] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0238] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A real-time monitoring and control column for layered sand control and layered water injection, including a layered sand control column, characterized in that: It also includes a cable-based real-time measurement and control injection string; The cable real-time measurement and control injection string is provided with downhole equipment, and the downhole equipment is arranged in the layered sand control string; The downhole equipment includes a completion tubing, a small-diameter bridge-type intelligent injector, and an annulus packer. The small-diameter bridge-type intelligent injector and the annulus packer are arranged in at least two groups on the completion tubing, and the annulus packer in each group is arranged above the small-diameter bridge-type intelligent injector. The small-diameter bridge-type intelligent dispenser is provided with a water nozzle regulating component.

2. A real-time monitoring and control string for layered sand control and layered water injection according to claim 1, characterized in that: The layered sand control pipe string includes a hanging and dropping packer, a sand control casing, a sand filter pipe string, a large-diameter packer, a large-diameter hydraulic slip, and a casing thread plug; The large-diameter packer, the sand filter pipe string, and the large-diameter hydraulic slip are arranged on the sand control casing; at least two sand filter pipe strings are arranged on the sand control casing, and each sand filter pipe string corresponds to an oil layer; a large-diameter packer is arranged between every two sand filter pipe strings; The large-diameter hydraulic slips are arranged at the bottom of the sand control casing; The casing plug is arranged at the lower end of the sand control casing; A hanging and releasing packer is arranged at the upper end of the sand control casing, and at least two groups of rubber cylinders and bidirectional slips are arranged on the hanging and releasing packer.

3. A real-time monitoring and control string for layered sand control and layered water injection according to claim 2, characterized in that: The sand filter pipe string is composed of sand filter pipes of different lengths connected together, and the length of the sand filter pipe string is greater than the thickness of the oil layer.

4. A real-time monitoring and control string for layered sand control and layered water injection according to claim 2, characterized in that: Wellhead equipment is also provided, including a water injection wellhead through which a cable can pass, a flow automatic controller, and a ground control cabinet; The lower end wellhead of the water injection wellhead that can pass through the cable is connected to the upper end of the completion oil pipe; The flow automatic controller is arranged at a detection port which can pass through the cable water injection wellhead; The ground control cabinet is installed outside the wellhead, and a data acquisition control system is integrated in the cabinet.

5. A real-time monitoring and control string for layered sand control and layered water injection according to claim 4, characterized in that: The downhole equipment also includes a downhole safety valve, an electro-hydraulic composite control packer, an anti-creeping sealed packer, and a sand-proof bottom sealing device arranged on the completion oil pipe; The downhole safety valve is arranged below the wellhead; The cable annular safety packer is arranged between the downhole safety valve and the hanging release packer; The number of the small-diameter bridge-type intelligent injection distributors is consistent with the number of sand filter pipe strings, and each small-diameter bridge-type intelligent injection distributor corresponds to one sand filter pipe string, that is, one water injection layer section; The annular space packer is an electro-hydraulic composite control packer, and an electro-hydraulic composite control packer is arranged above each small-diameter bridge-type intelligent injector, and the electro-hydraulic composite control packer does not contact the sand filter tube string; The anti-creep airtight packer is arranged below the lowest sand control pipe string; The sand-proof bottom sealing device is arranged at the lower end of the completion oil pipe.

6. A real-time monitoring and control string for layered sand control and layered water injection according to claim 5, characterized in that: The anti-sand bottom sealing device includes a constant pressure sand settling well washing valve, a sand settling tail pipe, and a guide wire plug; The constant pressure sand settling well washing valve is arranged at the lower end of the completion oil pipe; the sand settling tail pipe is arranged at the lower end of the constant pressure sand settling well washing valve; the guide wire plug is arranged at the lower end of the sand settling tail pipe, which is used to seal the bottom of the pipe column to make the oil pipe sealed as a whole.

7. A real-time monitoring and control string for layered sand control and layered water injection according to claim 5, characterized in that: The downhole equipment also includes a signal cable, a cable protector, a cable protection coupling, and a cable connector; The signal cable is connected with the power supply line and signal line of the electro-hydraulic composite control packer and the small-diameter bridge-type intelligent injection device. The signal cable passes through the cable annulus safety packer and the cable-through water injection wellhead and then connects to the control cabinet to realize the two-way transmission of power supply and signal for the downhole device. The cable protector is used to fix the signal cable on the outer wall of the completion tubing; The cable protection coupling replaces the oil pipe coupling of the tool section in the sand control pipe, and is used to connect the segmented oil pipes of the completion oil pipe, and at the same time, the signal cable is passed through and fixed on the outer wall of the completion oil pipe; The cable connector is used for connection and insulation sealing between the cable of an electro-hydraulic composite control packer and the cable of a small-diameter bridge-type intelligent injection dispenser.

8. A real-time monitoring and control string for layered sand control and layered water injection according to claim 7, characterized in that: The outer wall of the cable protection coupling body is provided with three centrally symmetrical through-going 'L'-shaped cable grooves; The cable groove comprises a starting portion and a bent inner cavity, the signal cable is arranged in the bent inner cavity, and the fastening bolt is arranged at the starting portion, which can prevent the signal cable from falling off after being fastened.

9. A real-time monitoring and control string for layered sand control and layered water injection according to claim 7, characterized in that: The small-diameter bridge-type intelligent dispenser also includes a middle joint, a detection component, and a main control circuit component; The upper outer wall of the middle joint is connected to an upper outer casing, and the lower outer wall is connected to a lower outer casing. The faucet control assembly and the main control circuit assembly are installed on the upper end surface of the middle joint; The detection component comprises a sensor component and an electromagnetic flowmeter component, wherein the sensor component is installed on the upper end surface of the middle joint, and the electromagnetic flowmeter component is installed on the lower end surface of the middle joint.

10. A real-time monitoring and control string for layered sand control and layered water injection according to claim 9, characterized in that: The small-diameter bridge-type intelligent dispenser also includes a first upper joint, an inner casing, and a first lower joint; The lower end of the inner casing is connected to the upper end surface of the middle joint by plugging, covering the water nozzle control component, the main control circuit component, and the sensor component; The lower end of the first upper joint is connected to the upper end of the upper outer casing through an upper union, the upper end of the inner casing is inserted into the lower end surface of the first upper joint, and a liquid hole is arranged at the upper end of the inner casing to form an upper bridge type flow passage; The upper end of the first lower joint is connected to the lower end of the lower outer casing through a lower union, and the upper end surface of the first lower joint is connected to the electromagnetic flowmeter assembly by plugging; The middle joint is provided with an annular flow hole, which connects the annular space between the upper outer casing and the inner casing with the interior of the lower outer casing.

11. A real-time monitoring and control string for layered sand control and layered water injection according to claim 10, characterized in that: The sensor assembly includes an internal pressure test module, an external pressure test module, and a temperature test module; The first upper joint side wall is provided with an upper cable sealing head, and the first lower joint side wall is provided with a lower cable sealing joint; The control cables of the sensor assembly and the faucet regulating assembly converge to the main control circuit assembly, the control line of the main control circuit assembly is connected to the signal cable, and the signal cable passes through the small-diameter bridge-type intelligent dispenser through the upper cable sealing head and the lower cable sealing head.

12. The real-time monitoring and control string for layered sand control and layered water injection according to claim 9, characterized in that: The faucet control assembly includes a motor, a switch sleeve, a travel switch, an upper fixing sleeve, a transmission rod, and a lower fixing sleeve; The motor is arranged at the upper end of the upper fixing sleeve, the motor output shaft is a lead screw, a threaded hole is arranged at the upper end of the transmission rod, the transmission rod is connected to the motor output shaft and is threadedly driven by the lead screw; The lower end of the transmission rod is provided with an adjusting piston, the lower fixed sleeve is inserted into the middle joint, the upper end of the lower fixed sleeve is provided with a water outlet, and the lower fixed sleeve is provided with a lower sealing sleeve below the water outlet; The transmission rod is provided with a pressure balance hole, the upper end of which is on the upper end surface of the transmission rod, and the lower end is arranged above the regulating piston; the side wall of the middle joint is provided with a water injection port corresponding to the water outlet; The lower end of the upper fixing sleeve is fixed to the upper end surface of the middle joint by a fixing screw, and a displacement sensor is arranged on the side wall of the upper fixing sleeve to detect the number of rotations of the lead screw; The upper fixed sleeve is provided with a through slot below the displacement sensor, an upper travel switch is provided at the upper end of the through slot, and a lower travel switch is provided at the lower end; a switch sleeve is provided on the lead screw, and the switch sleeve is located between the upper travel switch and the lower travel switch.

13. The real-time monitoring and control string for layered sand control and layered water injection according to claim 7, characterized in that: The electro-hydraulic composite controlled packer comprises a central pipe and an electric control mechanism and a setting mechanism arranged on the central pipe; The outer wall of the upper end of the central pipe is connected to a second upper joint, the lower end of the second upper joint is extended to form an electric drive annulus with the central pipe, and the inner wall of the lower end of the extended part of the second upper joint is connected to a connecting ring; The electric control mechanism is arranged in the electric drive annulus, and the upper end of the sealing mechanism is connected to the outer wall of the lower end of the connecting ring.

14. A real-time monitoring and control string for layered sand control and layered water injection according to claim 13, characterized in that: The electric control mechanism is composed of a drive motor, a transmission shaft, and a control piston; The drive motor is arranged on the upper end surface of the electric drive annulus, the upper end of the transmission shaft is connected to the output shaft of the drive motor, and the lower end is threadedly connected to the inner wall of the control piston; The central tube is provided with a spring seat below the connecting ring, a spring is provided on the spring seat, a closed ring is provided on the spring, a switch ring is connected to the inner wall of the closed ring, the upper end surface of the switch ring contacts the control piston, a control hole is provided on the switch ring, and a pressure transmission hole is provided on the central tube; When the spring pushes the sealing ring against the lower end surface of the connecting ring, the control hole is located above the pressure transmission hole; when the piston sits on the upper end surface of the connecting ring, the control hole coincides with the pressure transmission hole.

15. A real-time monitoring and control string for layered sand control and layered water injection according to claim 14, characterized in that: The sealing mechanism comprises an upper retaining bowl, an isolation piston, a hydraulic cylinder, a high-strength rubber cylinder, and a lower retaining bowl; The outer wall of the lower end of the connecting ring is connected to the upper end of the upper retaining bowl, an annular space between the upper retaining bowl and the center tube is provided with an isolating piston below the spring seat, an inner wall of the upper retaining bowl is provided with an anti-slip convex ring below the isolating piston, the lower retaining bowl is sleeved on the lower end of the center tube, and the high-strength rubber cylinder is provided between the upper retaining bowl and the lower retaining bowl.

16. A real-time monitoring and control string for layered sand control and layered water injection according to claim 15, characterized in that: The lower end of the central tube is connected to the inner wall of the second lower joint, and the lower retaining bowl is sleeved on the outer wall of the second lower joint through a retaining sleeve. The second upper joint and the second lower joint are each provided with a cable sealing head connected with the signal cable.

17. A measuring and controlling device for real-time measuring and controlling a pipe string for layered sand control and layered water injection, characterized in that: Including middle joint, faucet control component, detection component, main control circuit component; The upper outer wall of the middle joint is connected to an upper outer casing, and the lower outer wall is connected to a lower outer casing. The faucet control assembly and the main control circuit assembly are installed on the upper end surface of the middle joint; The detection component comprises a sensor component and an electromagnetic flowmeter component, wherein the sensor component is installed on the upper end surface of the middle joint, and the electromagnetic flowmeter component is installed on the lower end surface of the middle joint.

18. The measuring and controlling device for real-time measuring and controlling the pipe string for layered sand control and layered water injection according to claim 17, characterized in that: It also includes a first upper joint, an inner casing, and a first lower joint; The lower end of the inner casing is connected to the upper end surface of the middle joint by plugging, covering the water nozzle control component, the main control circuit component, and the sensor component; The lower end of the first upper joint is connected to the upper end of the upper outer casing through an upper union, the upper end of the inner casing is inserted into the lower end surface of the first upper joint, and a liquid hole is arranged at the upper end of the inner casing to form an upper bridge type flow passage; The upper end of the first lower joint is connected to the lower end of the lower outer casing through a lower union, and the upper end surface of the first lower joint is connected to the electromagnetic flowmeter assembly by plugging; The middle joint is provided with an annular flow hole, which connects the annular space between the upper outer casing and the inner casing with the interior of the lower outer casing.

19. The device for real-time monitoring and controlling the pipe string for layered sand control and layered water injection according to claim 18, characterized in that: The sensor assembly includes an internal pressure test module, an external pressure test module, and a temperature test module; The first upper joint side wall is provided with an upper cable sealing head, and the first lower joint side wall is provided with a lower cable sealing joint; The control cables of the sensor assembly and the faucet regulating assembly converge to the main control circuit assembly, the control line of the main control circuit assembly is connected to the signal cable, and the signal cable passes through the small-diameter bridge-type intelligent dispenser through the upper cable sealing head and the lower cable sealing head.

20. The device for real-time monitoring and controlling the pipe string for layered sand control and layered water injection according to claim 19, characterized in that: The faucet control assembly includes a motor, a switch sleeve, a travel switch, an upper fixing sleeve, a transmission rod, and a lower fixing sleeve; The motor is arranged at the upper end of the upper fixing sleeve, the motor output shaft is a lead screw, a threaded hole is arranged at the upper end of the transmission rod, the transmission rod is connected to the motor output shaft and is threadedly driven by the lead screw; The lower end of the transmission rod is provided with an adjusting piston, the lower fixed sleeve is inserted in the middle joint, the upper end of the lower fixed sleeve is provided with a water outlet, and the lower fixed sleeve is provided with a lower sealing sleeve below the water outlet; the side wall of the middle joint is provided with a water injection port corresponding to the water outlet; The transmission rod is provided with a pressure balance hole, the upper end of which is on the upper end surface of the transmission rod, and the lower end is arranged above the regulating piston; The lower end of the upper fixing sleeve is fixed to the upper end surface of the middle joint by a fixing screw, and a displacement sensor is arranged on the side wall of the upper fixing sleeve to detect the number of rotations of the lead screw; The upper fixed sleeve is provided with a through slot below the displacement sensor, an upper travel switch is provided at the upper end of the through slot, and a lower travel switch is provided at the lower end; a switch sleeve is provided on the lead screw, and the switch sleeve is located between the upper travel switch and the lower travel switch.

21. A construction method for real-time monitoring and control of pipe columns for layered sand control and layered water injection, characterized in that: The following steps are involved: S1. Run the layered sand control pipe string: Assemble the layered sand control pipe string, make the sand filter string face the oil layer, lower the sand control pipe string, and temporarily hang it at the wellhead of the workover with the elevator; S2. Run the layered sealing service string to complete the sealing: The layered setting service string is lowered into the layered sand control string to complete the setting of the layered sand control string, and the layered setting service string is lifted out by releasing the hand; S3. Run the cabled real-time monitoring and injection string: Connect the various parts of the cable real-time measurement and control injection string in sequence through the completion tubing, put them into the layered sand control string, make the small-diameter bridge-type intelligent injector correspond to each sand control section, start the electro-hydraulic composite control packer to complete the setting; S4, Layered Notes: The sensor component in the small-diameter bridge-type intelligent dispenser collects the internal and external pressure and temperature values ​​of the downhole oil pipe, and the electromagnetic flowmeter component collects the incoming water flow data; During water injection, the injection liquid flows into the upper bridge-type flow channel through the first upper joint, then enters the lower bridge-type flow channel through the annular flow port of the middle joint, and then enters the first lower joint; the injection liquid is divided into two in the first lower joint, one part enters the water inlet of the middle joint water nozzle regulating assembly through the measuring pipe inside the electromagnetic flowmeter assembly, and is injected into the corresponding oil layer from the water injection port after adjustment, and the other part flows to the next-level intelligent dispenser through the first lower joint; According to the injection requirements of each layer, control instructions are issued through the ground control system to adjust the water volume of the intelligent injectors on each layer until the injection requirements are met.

22. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 21, characterized in that: When assembling the layered sand control pipe string: connect the large-diameter hydraulic slips, large-diameter packers, and sand filter pipe strings in sequence through the sand control casing, connect the casing plug at the bottom, and use the number of sand control casings to adjust the distance between the tools so that the large-diameter packers are located near the barrier between the two oil layers, and the sand filter pipe string is facing the oil layer.

23. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 22, characterized in that: The layered setting service string includes an oil pipe, and the oil pipe is provided with a distance compensator, an oil pipe nipple, an expansion packer, a throttle, a sliding sleeve, a backwash valve, and a plug; The oil pipe is provided with the same number of throttles as the sand filter pipe string, and each throttle corresponds to a large-diameter packer or a large-diameter hydraulic slip; The expansion packer is arranged above and below each choke, and the expansion packer does not contact with the sand filter tube string; The lower end of the hanging release packer is provided with an inner joint and an outer joint, the inner joint is connected to the setting service pipe string, and the outer joint is connected to the upper end of the sand control casing; The distance compensator is arranged below the suspended release packer; the sliding sleeve is arranged at the lowest oil layer; the backwash valve is arranged at the bottom of the oil pipe; and the corresponding thread plug is arranged at the lower end of the oil pipe.

24. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 23, characterized in that: Step S2, running the layered sealing service string to complete the sealing includes: S201, run the layered sealing service string: The layered sealing tools are connected in sequence through the tubing and lowered into the sand control string. The threaded plug at the bottom of the sealing string contacts the threaded plug of the casing at the bottom of the sand control string to complete the positioning. The distance between the tools is adjusted by the number of tubing roots so that the choke is located directly opposite the large-diameter packer and large-diameter hydraulic slip on the sand control string. The expansion packer is connected above and below the choke and its position should be near the sand control casing above and below the large-diameter packer and large-diameter hydraulic slip. The length of the tubing short section is adjusted by calculation, and finally the distance compensator is lowered so that the top of the sealing service string and the top of the sand control string are connected to the hanging drop packer and transported into the well together through the tubing. S202, Sealing: After the string is lowered to the designed depth, hydraulic pressure is applied through the tubing, and the rubber tube of the expansion packer on the sealing service string expands and seals on the inner wall of the sand control casing. The two sets of expansion packers will form a relatively closed space inside the sand control casing. After the hydraulic pressure continues to rise and reaches the throttle opening pressure, the throttle water outlet will open, and the pressure in the sealing service string will be transmitted to the closed space. When the pressure in the closed space reaches the rated sealing pressure of the large-diameter packer and the large-diameter hydraulic slip, the sealing mechanism placed inside the tool starts to work. Under the action of hydraulic pressure, the rubber tube of the large-diameter packer is compressed and expanded, and the slip teeth of the large-diameter hydraulic slips are extended, and both are anchored on the inner wall of the wellbore; while this process is working, the setting mechanism inside the hanging and releasing packer in the same pressure system also starts to work, compressing and expanding the rubber tube, extending the two-way slip teeth, and anchoring on the inner wall of the wellbore, finally realizing the oil layer isolation and sealing and the upper and lower double metal support anchoring of the sand control pipe string; during the setting process of the sand control pipe string, the pressure must always be kept above the rated setting pressure value and maintained for a period of time; S203, Throwing: After the sand control string is set, the oil pipe is continuously pressurized to the opening pressure of the sliding sleeve, so that the seal of the water outlet hole of the sliding sleeve is separated from the sealing surface, and the setting service pipe string is connected with the formation to complete the pressure relief. After the pressure relief, the morning rubber cylinder of the expansion packer is automatically retracted and separated from the inner wall of the sand control casing; then a steel ball is put into the setting service pipe string, and the steel ball sits on the releasing ball seat inside the hanging releasing packer, and the oil pipe is hydraulically pumped to the rated releasing pressure of the hanging releasing packer, and the releasing mechanism inside the hanging releasing packer works, and the releasing anchor claw is separated from the internal connector of the packer, so that the sand control pipe string is separated from the setting service pipe string, and the setting service pipe string can be taken out by pulling out the oil pipe, and the sand control pipe string remains in the well, realizing the stratified mechanical sand control of the oil layer.

25. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 21, characterized in that: When the cable-connected real-time measurement and control injection string is connected: The completion tools are connected in sequence through the completion tubing, and the distance between the completion tools is adjusted by the number of completion tubings, so that the positions of the electro-hydraulic composite control packer and the anti-creeping sealed packer are near the sand control casing between the two groups of sand control pipe strings. The small-diameter bridge-type intelligent injector corresponds to each sand control section. The signal cable is connected to the small-diameter bridge-type intelligent injector and the electro-hydraulic composite control packer in sequence. The cable inside the sand control pipe is protected and fixed by a cable protection coupling. A cable protector is used to fix the cable to the outer wall of each tubing above the sand control section. A cable annulus safety packer and a downhole safety valve are installed at the wellhead. The completion tubing is connected to the wellhead, and the signal cable passes through the cable-through water injection wellhead and is connected to the ground control cabinet.

26. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 21, characterized in that: The electro-hydraulic composite controlled packer has a mode 1: the packer is automatically set when water is injected, and automatically released when water injection is stopped; Mode 2: The packer is automatically set by water injection and released by electric control; In mode 1 or mode 2, when the rubber cartridge is damaged, the unsealing of the rubber cartridge fails, and the liquid in the wellbore is isolated by the isolation piston and cannot enter the interior of the tubing string, thereby ensuring the stability of the normal water injection pressure system inside the tubing string.

27. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 26, characterized in that: Mode 1: the packer is automatically set when water is injected and automatically released when injection is stopped, including the following steps: A101 packer setting: The ground control drive motor runs, and the control piston is pushed down through the transmission shaft. The control piston overcomes the resistance of the spring and pushes open the switch ring and the sealing ring, so that the pressure transmission hole is always kept open; during the water injection process, the packer setting mechanism is connected to the pressure in the center tube, and the hydraulic pressure pushes the isolation piston down to compress the hydraulic oil in the hydraulic cylinder. The hydraulic pressure generated by the hydraulic oil compression expands the rubber cylinder, realizing the automatic packer setting; A102 unsealing: The control piston is always kept in the right position and does not move. The sealing mechanism and the center tube are always in pressure communication. When the injection is stopped, the pressure in the sealing mechanism is lower than the pressure in the hydraulic cylinder, and the isolation piston moves upward to release the pressure in the hydraulic cylinder. The rubber cylinder is automatically unsealed by depressurization. In this working mode, the packer can be automatically set when water is injected and automatically released when injection stops.

28. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 27, characterized in that: Mode 2: The packer is automatically sealed by water injection and released by electric control; A201 Setting: The ground control driving motor is running, and the control piston is pulled upward through the transmission shaft. Under the action of the spring force, the switch ring and the sealing ring are always in a closed and sealed state, and the pressure transmission hole is also kept closed; during the water injection process, the pressure in the center tube overcomes the resistance of the spring to push open the switch ring and the sealing ring, the pressure transmission hole is opened, the setting mechanism is connected with the pressure in the center tube, the hydraulic pressure pushes the isolation piston downward, compresses the hydraulic oil in the hydraulic cylinder, and the hydraulic pressure generated by the hydraulic oil compression expands the rubber tube to realize automatic setting of the packer; when stopping injection, the pressure in the center tube cannot overcome the spring force of the spring, and the switch ring and the sealing ring are instantly moved upward and closed. At this time, the setting pressure is still maintained in the setting mechanism, the isolation piston keeps compressing the hydraulic oil in the hydraulic cylinder, the rubber tube remains in an expanded state, and the packer is not unsealed when injection is stopped; A202 unsealing: When the injection is stopped, the ground control drive motor runs, and the control piston is pushed down through the transmission shaft. The control piston pushes the switch ring and the sealing ring to open the pressure transmission hole, and the sealing mechanism releases pressure. If the pressure in the sealing mechanism is less than the pressure in the hydraulic cylinder, the isolation piston moves up to release the pressure in the hydraulic cylinder, and the rubber cylinder is automatically unsealed after the pressure is released; In this working mode, the packer can be automatically set by water injection and automatically released by manual electric control.

29. The construction method of the real-time monitoring and control pipe string for layered sand control and layered water injection according to claim 21, characterized in that: During stratified injection, the sensor component in the small-diameter bridge-type intelligent injector collects the internal and external pressure and temperature values ​​of the downhole oil pipe. The internal pressure test module is connected to the upper bridge-type flow channel through the internal pressure hole to collect the internal pressure data of the oil pipe. The external pressure test module is connected to the casing through the external pressure hole to collect the annular pressure data of the oil pipe and the casing. The temperature test module collects temperature data; the internal conductive medium of the electromagnetic flowmeter component, that is, the injected water flows through the measuring pipeline to collect the incoming water flow data; the collected data is processed by the main control circuit component and uploaded to the ground control system through a cable.

Images