Expanding type intelligent measurement and control separate injection tubular column, intelligent measurement and control device thereof and use method of intelligent measurement and control device

Abstract

The expanding type intelligent measurement and control separate injection pipe column comprises a water injection oil pipe, and further comprises the intelligent measurement and control device, a cable-passing expansion packer and a constant-pressure sand setting well washing valve which are arranged on the water injection oil pipe; the constant-pressure sand setting well washing valve is arranged at the lower end of the water injection oil pipe; at least two intelligent measurement and control devices are arranged above the constant-pressure sand setting well washing valve, and each intelligent measurement and control device corresponds to one water injection layer; a cable-passing expansion packer is arranged between every two intelligent measurement and control devices; automatic measurement and control separate injection requirements of a water injection well are met, and the number of separate injection layers is not limited; stratum data are monitored and collected in real time; automatic testing and adjusting of each layer are achieved, and no extra instrument is needed; layered metering of flow is achieved, and the requirement for layered water distribution is met.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield water injection well split injection, in particular to an expandable intelligent measurement and control split injection pipe string and an intelligent measurement and control device and a use method thereof. Background Art

[0002] There are two ways to inject water into oil fields: general injection and stratified injection. General injection means that all layers in the whole well are not isolated and water is injected at the same pressure; stratified injection means that packers are placed in the injection well to separate the oil layers, and a water distributor is placed in each layer to inject water. Stratified injection wells mainly use integrated testing and adjustment and conventional casting and catching testing and adjustment processes. The workload of on-site testing, adjustment and sealing is large, resulting in a large waste of manpower and equipment resources. With the complexity of the injection well conditions and the influence of factors such as corrosion and scaling of the injection pipe, the workload and cost of testing and adjustment will increase. The testing and adjustment equipment and testing team face many challenges such as heavy tasks and high intensity.

[0003] Cable-based intelligent water injection is the process of transmitting underground production status parameters to the ground in real time via cables. After ground data processing and analysis, the ground control system issues instructions to adjust the intelligent water distributor to achieve water injection in each layer.

[0004] The purpose of the present invention is to provide a stratified water injection process that can control the water distribution of each layer underground from the ground through cables. The process can control the switch of each layer of water nozzles, realize the test of water volume in each layer, and collect injection parameters in each layer.

[0005] Publication (Announcement) No.: CN115680587A discloses an intelligent layered injection string for water-polymer injection wells, belonging to the technical field of oilfield production increase and injection. The layered injection string includes a double-layer oil pipe downhole, a downhole safety valve, a top packer, a cable positioning seal, a dual-medium injection working cylinder, an isolation packer, a cable insertion seal and a round plug. The dual-medium injection working cylinder is connected to the ground controller through a steel armored cable; its operation method is: well clearance; the dual-medium injection working cylinder is tested to be normal, and the string of the present invention and the steel armored cable are lowered; the string of the present invention is tested for sealing; different media are injected according to the requirements of the reservoir; and fixed-point acidification. This prior art can realize online stepless regulation of layered dual-medium injection in wells with arbitrary inclinations, and can also implement fixed-point acidification according to the requirements of the reservoir. This prior art can realize online stepless regulation of double pipes in the same well, simultaneous injection and layering of water and polymer multi-layer sections, and injection, and can also implement fixed-point acidification according to production requirements, solving many problems brought about by the previous water-polymer ground injection string.

[0006] The prior art has the problems of being unable to backwash and prevent sand, and the real-time injection data of layers is incomplete.

[0007] Publication (Announcement) No.: CN109025926B, discloses a centralized control type intelligent layered water injection string and control system, the string includes a wellhead acoustic communication device, a cable integrated intelligent water distribution packer, a cable packer, a cable monomer intelligent water distributor, an intelligent control system and a downhole acoustic communication device arranged in the downhole string along the oil injection pipe from top to bottom through cables and cable joints in series; the wellhead acoustic communication device and the downhole acoustic communication device build a downhole and ground wireless communication system; the integrated control module uniformly controls flow monitoring and regulation, pressure monitoring, and the intelligent control system optimizes the control sequence; the cable integrated intelligent water distribution packer integrates the functions of two intelligent water distributors and one packer. This prior art solves the problem of wireless two-way transmission of downhole data in the existing intelligent water distribution string, realizes data sharing between downhole intelligent water distribution devices, improves the allocation efficiency, simplifies the existing intelligent water distribution string structure, and improves the intelligence level of the injection well.

[0008] The prior art has the problems of being unable to backwash and prevent sand, and the real-time injection data of layers is incomplete.

[0009] Publication (announcement) number: CN113818850A, discloses a cable intelligent injection system capable of real-time monitoring and a method of using the system, including an injection wellhead, a cable anti-pressure mechanism is arranged on the outside of the injection wellhead, a hanger is fixedly connected to the bottom of the injection wellhead, a lifting short section is fixedly connected to the outside of the hanger, a pipe string is fixedly connected to the bottom of the lifting short section, a depth calibration short section is fixedly connected to the outside of the pipe string and below the lifting short section. The prior art has a compact structure, simple and convenient operation, and strong practicality. By arranging a near-electric alarm and a monitoring camera at the bottom of the well and connecting them to a ground control cabinet and a central control computer, the situation at the bottom of the well can be monitored and controlled in real time. At the same time, by arranging a cable anti-pressure mechanism at the injection wellhead, the signal cable can be prevented from being damaged or even squeezed off by the lifting card when the cable intelligent injection system lifts and lowers the oil pipe, thereby greatly reducing the maintenance time and saving costs, which is conducive to practical application.

[0010] The prior art has the problems of being unable to backwash and prevent sand, and the real-time injection data of layers is incomplete.

[0011] 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

[0012] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide an expandable intelligent measurement and control injection string and its intelligent measurement and control device and its use method, so as to meet the needs of automatic measurement and control of injection wells, with no limit on the number of injection layers; real-time monitoring and collection of formation data; automatic measurement and adjustment of each layer without the need for additional instruments; and stratified metering of flow to meet the needs of stratified water distribution.

[0013] In order to achieve the above object, the present invention adopts the following technical solutions:

[0014] An expandable intelligent measurement and control injection pipe string and its intelligent measurement and control device and its use method, comprising a water injection oil pipe, and also comprising an intelligent measurement and control device, a cable expansion packer, and a constant pressure sand settling well washing valve arranged on the water injection oil pipe;

[0015] The constant pressure sand settling well washing valve is arranged at the lower end of the water injection oil pipe;

[0016] At least two intelligent measurement and control devices are arranged above the constant pressure sand settling and well washing valve, and each intelligent measurement and control device corresponds to a water injection layer; and a cable expansion packer is arranged between every two intelligent measurement and control devices.

[0017] The intelligent measurement and control device comprises a first upper joint, a central tube, a measurement and control integrated nipple, an outer casing, a water outlet fixing ring, a water outlet adjustment ring, an anti-reverse spring, a spring adjustment ring, a fastening ring, and a first lower joint;

[0018] Taking the test integrated short section as the reference, the central tube is plugged into the upper end face of the test integrated short section, the outer casing is connected to the outer wall of the upper end of the test integrated short section through threads, and the upper joint is plugged into the central tube.

[0019] The lower end of the test integrated short section is connected to the water outlet fixing ring through a thread, the water outlet adjustment ring and the anti-reverse spring are inserted from the lower end of the test integrated short section in sequence, and the spring adjustment ring is connected to the lower end of the test integrated short section through a thread to compress the anti-reverse spring.

[0020] The lower end of the first upper joint is connected to the upper end of the central tube, and the upper end of the outer casing is provided with a union adjustment ring to fasten the first upper joint;

[0021] The first lower joint is plugged into the lower end of the test integrated short section, the fastening ring is inserted from the lower end of the lower joint, and is connected to the test integrated short section through threads to tighten the lower joint.

[0022] An axial flow test channel and a first mounting countersunk hole are arranged on the wall of the measurement and control integrated short section; a hole back pressure test module is arranged at the upper end of the flow test channel, a shaft shoulder is arranged at the bottom of the first mounting countersunk hole, and a rotary electric drive control short section is arranged on the shaft shoulder;

[0023] The flow test channel is connected to the inner cavity of the measurement and control integrated short section through a diversion hole. The side wall of the flow test channel is provided with a flow test water outlet hole connected to the first installation countersunk hole. The first installation countersunk hole is provided with a water outlet, and the water outlet is blocked by a water outlet regulating ring. The rotary electric drive regulating short section controls the connection between the flow test water outlet hole and the water outlet.

[0024] The rotary electric drive control sub comprises a rotary control valve and a drive mechanism;

[0025] The rotary regulating valve comprises a regulating fixed valve, a movable valve plate regulating shaft, a regulating valve spring, and a regulating valve sealing nipple; the upper end of the regulating fixed valve is closed, the upper end of the regulating valve sealing nipple is connected to the lower end of the regulating fixed valve, the front end of the movable valve plate regulating shaft is inserted into the central countersunk hole of the regulating fixed valve, and the rear end is inserted into or passes through the central hole of the regulating valve sealing nipple, a valve plate is arranged on the movable valve plate regulating shaft, the regulating valve spring is arranged between the valve plate and the regulating valve sealing nipple, and the upper end surface of the valve plate is in contact with the inner end surface of the regulating fixed valve;

[0026] The upper end of the regulating fixed valve is provided with a through fixed waist-shaped hole, the valve plate of the movable valve plate regulating shaft is provided with a movable waist-shaped hole, and the valve wall of the regulating fixed valve is provided with a water inlet groove;

[0027] The lower end of the movable valve plate regulating shaft is connected to the output shaft of the driving mechanism, and the upper end of the driving mechanism is connected to the lower end of the regulating valve sealing nipple.

[0028] The upper end surface of the measurement and control integrated short section is also threadedly connected with an external pressure test module, a rotary electric drive control short section, a backhole pressure test module, an internal pressure test module, and a temperature test module; and also includes a control circuit module installed in a plug-in manner;

[0029] The tail wires of all test modules are connected to the control circuit module; the external cables of the control circuit are aggregated into downhole signal cables;

[0030] An orifice plate is arranged in the flow test channel, and an orifice plate pressing ring is arranged above the orifice plate. The orifice plate pressing ring presses the orifice plate tightly onto the inner step of the flow test channel.

[0031] An internal pressure hole and an external pressure hole are provided on the wall of the measurement and control integrated short section; the internal pressure hole connects the internal pressure test module with the inside of the measurement and control integrated short section, and the external pressure hole connects the external pressure test module with the outside of the measurement and control integrated short section.

[0032] The driving mechanism includes a motor connector, a thrust transmission shaft, a motor adapter, a reduction motor, a protective sleeve, and an end cap;

[0033] The upper end of the motor connector is connected to the lower end of the regulating valve sealing nipple, the inner wall of the lower end of the motor connector is threadedly connected to the motor adapter, the outer wall of the lower end is threadedly connected to the protective sleeve, and the lower end of the protective sleeve is threadedly connected to the end cap;

[0034] The reduction motor is installed at the lower end of the motor adapter and fixed by screws;

[0035] The lower end of the movable valve plate adjusting shaft is connected to the upper end of the thrust transmission shaft through a first coupling, and the movable valve plate adjusting shaft and the thrust transmission shaft pass through the regulating valve sealing nipple and the motor connector in sequence; the lower end of the thrust transmission shaft is connected to the output shaft of the reduction motor through a second coupling, and the tail wire of the reduction motor passes through the end cap and is connected to the control circuit module; under the control of the control circuit module, the reduction motor drives the thrust transmission shaft and the movable valve plate adjusting shaft to rotate.

[0036] It also includes a wire passing module, which includes an external pin sealing head, a wire lead hole and an internal pin sealing module;

[0037] The outer pin sealing head is installed at the upper end of the lead hole by threaded connection, and the inner pin sealing module is installed at the lower end of the lead hole by plugging and fixed with screws;

[0038] The wire passing module is arranged on the first upper joint, the first lower joint, and the measurement and control integrated short section, so that the signal cable can pass through the intelligent measurement and control device.

[0039] It also includes a water injection wellhead that can be traversed by cables, a flow automatic controller, a ground control cabinet, and a remote measurement and control service terminal;

[0040] The upper end of the water injection oil pipe is connected to the water injection wellhead that can pass through the cable, the flow automatic controller is connected to the measurement port of the water injection wellhead that can pass through the cable, the ground control cabinet is set at the well site, and the remote transmission measurement and control service terminal is connected to the ground control cabinet through the network;

[0041] A cable connector and a cable protector are arranged between the topmost intelligent measurement and control device and the traversable cable water injection wellhead; the uphole signal cable of the ground control cabinet passes through the traversable cable water injection wellhead, is connected to the upper end of the cable connector through the cable protector, and an downhole signal cable is installed at the lower end of the cable connector.

[0042] A constant-pressure sand settling and well-washing valve is arranged at the lower end of the water injection oil pipe, a sand settling tail pipe is arranged at the lower end of the constant-pressure sand settling and well-washing valve, and a thread plug is arranged at the bottom of the sand settling tail pipe.

[0043] The constant-pressure sand settling and well-washing valve comprises a second upper joint, an outer pipe, a sand prevention valve, a connecting nipple, a flow divider, and a second lower joint.

[0044] The second upper joint, the outer tube, the flow divider, and the second lower joint are connected in sequence by threads; wherein the lower end of the outer tube is connected to the outer wall of the upper end of the flow divider, and the upper end of the second lower joint is connected to the outer wall of the lower end of the flow divider;

[0045] A second countersunk hole is arranged at the center of the upper end of the flow divider, an oil-washing well water inlet hole is arranged on the side wall of the countersunk hole to connect the second countersunk hole with the outside, and an axial sand settling channel is arranged on the hole wall of the flow divider;

[0046] The connecting short section is connected to the upper end of the second counterbore, and the sand prevention valve is arranged on the upper end of the connecting short section.

[0047] The anti-sand valve comprises a guide ball cover, a large spring, a valve ball, a valve seat, a valve seat sleeve, a ball cover and a small spring;

[0048] The guide ball cover is threadedly connected to the valve seat sleeve, the upper end of the guide ball cover is connected to the outer cone spring seat, and a large spring, a first valve ball, and a first valve seat are arranged under the outer cone spring seat in sequence;

[0049] A step is arranged inside the valve seat sleeve, and a ball retaining cover, a small spring, a valve ball and a second valve seat are arranged under the step;

[0050] The lower end of the valve seat sleeve is connected to the upper end of the connecting nipple;

[0051] The ball stop cover is provided with a through hole or the ball stop cover is a spoke wheel structure.

[0052] The method for using the expandable intelligent measurement and control injection string includes the following steps:

[0053] S1. Connect the tool and put it into the tool string

[0054] The tools are connected in sequence through the water injection oil pipes, and the distance between the tools is adjusted by the number of oil pipes, so that the cable expansion packer is located near the barrier between the two water injection layer sections. The intelligent measurement and control device corresponds to each water injection layer section. The signal cable is connected to the intelligent measurement and control device in sequence and passes through the cable expansion packer. Each oil pipe uses a cable protector to fix the signal cable on the outer wall of the oil pipe. The water injection oil pipe is hung on the water injection wellhead that can pass through the cable, and the cable passes through the wellhead and is connected to the ground control cabinet;

[0055] S 2. Trial injection and sealing

[0056] The remote measurement and control service terminal controls the intelligent measurement and control devices of each layer to turn on the water nozzle switch, and water injection begins on the ground. The incoming water enters the intelligent measurement and control device through the water injection oil pipe. The rotary electric drive control short section adjusts the water volume and then flows out from the water outlet. At this time, the spring force of the anti-reverse spring must be overcome to push open the water outlet adjustment ring before injection into the formation. The water injection process will generate a throttling pressure difference inside and outside the water injection oil pipe. The internal pressure is greater than the external pressure. Under the action of the throttling pressure difference, the rubber cylinder of the cable expansion packer automatically expands to complete the sealing and separate the water injection layer section.

[0057] S 3. Well washing

[0058] Stop water injection, the casing pressure is balanced, the throttling pressure difference inside and outside the tubing disappears, and the packer rubber tube is automatically retracted to complete the unsealing; adopt the reverse circulation well washing mode, the well washing fluid enters the water injection tubing from the casing through the constant pressure sand settling well washing valve and then returns to the ground;

[0059] S4, water injection, testing and adjustment

[0060] The sensors in the intelligent measurement and control device collect the pressure and temperature values ​​inside and outside the downhole oil pipe. The internal pressure test module is connected to the central flow channel through the internal pressure hole to collect the pressure data inside the oil pipe. The external pressure test module is connected to the casing through the external pressure hole to collect the pressure data of the oil pipe and the casing annulus. The post-hole pressure test module is connected to the flow test channel to collect the pressure data after the incoming water flows through the orifice plate. The temperature test module collects temperature data.

[0061] Part of the injected water enters the flow test channel through the diversion hole at the lower end of the central flow channel of the intelligent measurement and control device, and part of it continues to be injected into the lower intelligent measurement and control device; the incoming water enters the flow test channel and passes through the orifice plate, which is pressed tightly in the flow test channel by the orifice plate pressure ring. Two different pressure values ​​are formed before and after the orifice plate. The pressure value before the orifice plate is equal to the pressure value inside the oil pipe, which is Pinner, collected by the internal pressure test module, and the pressure value behind the orifice plate Phole is collected by the back-hole pressure test module. The inner hole area of ​​the orifice plate is a different fixed value A0 according to different flow test ranges. The flow rate q of this layer can be calculated using the differential pressure flow calculation formula v :

[0062]

[0063] The outflow coefficient C can be expressed as:

[0064] C=0.5961+0.0261β 2 -0.216β 8 (2)

[0065] β=d / D (3)

[0066] Where: C-discharge coefficient; β-diameter ratio; d-throttle diameter; D-flow channel diameter, i.e. the inner diameter of the flow test channel; ΔP-pressure difference, ΔP=P内 -P 孔 ; A 0 -orifice area; ρ-fluid density.

[0067] According to the allocation requirements of each layer, the remote measurement and control service terminal issues control instructions to adjust the water volume of the intelligent measurement and control devices on each layer until the allocation requirements are met. After the collected data is processed by the processor, it is uploaded to the ground control cabinet through the signal cable, and the ground control cabinet then sends it to the remote measurement and control service terminal via wired or wireless means.

[0068] In the intelligent measurement and control device, the incoming water flows out from the flow test water outlet and enters the rotary electric drive control short section through the water inlet tank. There are two symmetrical waist-shaped holes on the adjusting shaft of the fixed valve and the movable valve plate. The fixed valve and the movable valve plate are completely fitted, and a metal seal is adopted. The adjusting valve spring is used to tighten the movable valve plate adjusting shaft, and the movable valve plate adjusting shaft is driven by the reduction motor to rotate radially.

[0069] When the two waist-shaped holes on the adjustment shaft of the fixed valve and the movable valve plate are completely overlapped, the water volume is the largest. As the movable valve plate adjustment shaft continues to rotate, the overlapping area of ​​the two waist-shaped holes will become smaller and smaller, and the water volume will also decrease accordingly. When the two waist-shaped holes on the adjustment shaft of the fixed valve and the movable valve plate do not overlap at all, the water volume is zero.

[0070] As the water volume changes, the differential pressure before and after the orifice plate will also change. Different flow values ​​can be obtained according to the flow calculation formula.

[0071] Finally, the incoming water flows out from the water outlet after passing through the movable waist-shaped hole and the fixed waist-shaped hole, pushing open the water outlet regulating ring and injecting into the formation.

[0072] The intelligent measurement and control device dedicated to the expansion type intelligent measurement and control injection pipe string includes a central pipe, a measurement and control integrated short joint, an outer casing, a water outlet fixing ring, a water outlet adjustment ring, an anti-reverse spring, a spring adjustment ring, and a fastening ring;

[0073] Taking the test integrated short section as the reference, the central tube is plugged into the upper end face of the test integrated short section, the outer casing is connected to the outer wall of the upper end of the test integrated short section through threads, and the upper joint is plugged into the central tube.

[0074] The lower end of the test integrated short section is connected to the water outlet fixing ring through a thread, the water outlet adjustment ring and the anti-reverse spring are inserted from the lower end of the test integrated short section in sequence, and the spring adjustment ring is connected to the lower end of the test integrated short section through a thread to compress the anti-reverse spring;

[0075] An axial flow test channel and a first mounting countersunk hole are arranged on the wall of the measurement and control integrated short section; a hole back pressure test module is arranged at the upper end of the flow test channel, a shaft shoulder is arranged at the bottom of the first mounting countersunk hole, and a rotary electric drive control short section is arranged on the shaft shoulder;

[0076] The flow test channel is connected to the inner cavity of the measurement and control integrated short section through a diversion hole. The side wall of the flow test channel is provided with a flow test water outlet hole connected to the first installation countersunk hole. The first installation countersunk hole is provided with a water outlet, and the water outlet is blocked by a water outlet regulating ring. The rotary electric drive regulating short section controls the connection between the flow test water outlet hole and the water outlet.

[0077] The rotary electric drive control sub comprises a rotary control valve and a drive mechanism;

[0078] The rotary regulating valve comprises a regulating fixed valve, a movable valve plate regulating shaft, a regulating valve spring, and a regulating valve sealing nipple; the upper end of the regulating fixed valve is closed, the upper end of the regulating valve sealing nipple is connected to the lower end of the regulating fixed valve, the front end of the movable valve plate regulating shaft is inserted into the central countersunk hole of the regulating fixed valve, and the rear end is inserted into or passes through the central hole of the regulating valve sealing nipple, a valve plate is arranged on the movable valve plate regulating shaft, the regulating valve spring is arranged between the valve plate and the regulating valve sealing nipple, and the upper end surface of the valve plate is in contact with the inner end surface of the regulating fixed valve;

[0079] The upper end of the regulating fixed valve is provided with a through fixed waist-shaped hole, the valve plate of the movable valve plate regulating shaft is provided with a movable waist-shaped hole, and the valve wall of the regulating fixed valve is provided with a water inlet groove;

[0080] The lower end of the movable valve plate regulating shaft is connected to the output shaft of the driving mechanism, and the upper end of the driving mechanism is connected to the lower end of the regulating valve sealing nipple.

[0081] The upper end surface of the measurement and control integrated short section is also threadedly connected with an external pressure test module, a rotary electric drive control short section, a backhole pressure test module, an internal pressure test module, and a temperature test module; and also includes a control circuit module installed in a plug-in manner;

[0082] The tail wires of all test modules are connected to the control circuit module.

[0083] An orifice plate is arranged in the flow test channel, an orifice plate pressure ring is arranged above the orifice plate, and the orifice plate pressure ring presses the orifice plate tightly against the inner step of the flow test channel;

[0084] An internal pressure hole and an external pressure hole are provided on the wall of the measurement and control integrated short section; the internal pressure hole connects the internal pressure test module with the inside of the measurement and control integrated short section, and the external pressure hole connects the external pressure test module with the outside of the measurement and control integrated short section.

[0085] Compared with the prior art, the present invention has the following beneficial effects:

[0086] 1. The pipe string meets the requirements of automatic measurement and control of water injection wells, with no limit on the number of injection layers.

[0087] 2. The intelligent measurement and control device involved in the pipe string has built-in pressure and temperature sensors that can monitor and collect formation data in real time.

[0088] 3. The intelligent measurement and control device involved in the pipe string can realize automatic measurement and adjustment of each layer without the need for additional instruments.

[0089] 4. The intelligent measurement and control device involved in the pipe string can realize stratified flow metering to meet the needs of stratified water distribution.

[0090] 5. The intelligent measurement and control device involved in the pipe string can meet the use of the expansion packer, the process pipe string is not limited, and the selection range is wider.

[0091] 6. The pipe column has the function of self-sand flow test, which can meet the long-term stable and accurate measurement of flow in complex water quality.

[0092] 7. The pipe string can achieve circumferential water discharge to prevent backflow and reduce the erosion effect of water injection on the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] Figure 1 It is a structural schematic diagram of the expandable intelligent measurement and control injection string of the present invention;

[0094] Figure 2 It is a structural schematic diagram of the intelligent measurement and control device of the present invention;

[0095] Figure 3 It is a structural schematic diagram of the first upper joint of the intelligent measurement and control device of the present invention;

[0096] Figure 4 It is a structural schematic diagram of the upper end of the measurement and control integrated short section of the intelligent measurement and control device of the present invention;

[0097] Figure 5 It is a structural schematic diagram of a rotary electric drive control subsection of an intelligent measurement and control device of the present invention;

[0098] Figure 6 It is a schematic diagram of the water injection flow direction of the intelligent measurement and control device of the present invention;

[0099] Figure 7 It is a structural schematic diagram of a constant-pressure sand settling and well-washing valve of an expandable intelligent measurement and control injection pipe column of the present invention;

[0100] Figure 8 It is a structural schematic diagram of the inner and outer pressure transmission holes on the measurement and control integrated short section of the intelligent measurement and control device of the present invention;

[0101] In the figure: 1. Plug; 2. Sand settling tail pipe; 3. Constant pressure sand settling well washing valve; 4-1. Intelligent measurement and control device; 5. Cable expansion packer; 4-2. Intelligent measurement and control device; 6. Cable connector; 7. Cable protector; 8. Signal cable; 9. Water injection oil pipe; 10. Casing; 11. Cable-through water injection wellhead; 12. Flow automatic controller; 13. Ground control cabinet; 14. Remote measurement and control service terminal; 15. First upper joint; 16. Union adjustment ring; 17. Center pipe ; 18. Outer casing; 19. Measurement and control integrated short section; 20. Water outlet fixing ring; 21. Water outlet adjustment ring; 22. Anti-reverse spring; 23. Spring adjustment ring; 24. Fastening ring; 25. First lower joint; 26. External pin sealing head; 27. Lead hole; 28. Internal pin sealing module; 29. ​​External pressure test module; 30. Control circuit module; 31. Rotary electric drive control short section; 32. Hole back pressure test module; 33. Internal pressure test module; 34. Temperature test module ;35, regulating fixed valve;36, moving valve plate regulating shaft;37, regulating valve spring;38, regulating valve sealing nipple;39-1, first coupling;40, motor connector;41, thrust drive shaft;39-2, second coupling;42, motor adapter;43, reduction motor;44, protective cover;45, end cap;46, water inlet groove;47, moving waist-shaped hole;48, fixed waist-shaped hole;49, central flow passage;50, diverter hole;51, flow test passage; 52. Orifice plate; 53. Orifice plate pressure ring; 54. Flow test water outlet hole; 55. Water outlet; 56. Inner pressure hole; 57. Outer pressure hole; 58. Second upper joint; 59. Outer pipe; 60. Guide ball cover; 61. Large spring; 62. Valve ball; 63. Valve seat; 64. Valve seat sleeve; 65. Ball retaining cover; 66. Small spring; 67. Connecting short section; 68. Diverter body; 69. Second lower joint; 70. Well washing water inlet hole; 71. Sand settling channel; 72. Well washing channel. DETAILED DESCRIPTION

[0102] 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.

[0103] Embodiment 1:

[0104] See also Figure 1The expandable intelligent measurement and control injection string in the present invention includes a water injection oil pipe 9, and also includes an intelligent measurement and control device 4, a cable expansion packer 5, and a constant pressure sand settling and well washing valve 3 arranged on the water injection oil pipe; the constant pressure sand settling and well washing valve 3 is arranged below the water injection oil pipe 9; at least two intelligent measurement and control devices 4 are arranged above the constant pressure sand settling and well washing valve 3, and each intelligent measurement and control device 4 corresponds to a water injection layer; a cable expansion packer 5 is arranged between every two intelligent measurement and control devices 4. In this embodiment, for the convenience of explanation, two intelligent measurement and control devices 4 are arranged, namely, a first intelligent measurement and control device 4-1 and a second intelligent measurement and control device 4-2;

[0105] See also Figure 1 The pipe string includes, connected from bottom to top in sequence, a wire plug 1, a sand settling tail pipe 2, a constant pressure sand settling well washing valve 3, a first intelligent measurement and control device 4-1, a cable expansion packer 5, a second intelligent measurement and control device 4-2, a cable connector 6, a cable protector 7, a signal cable 8, a water injection oil pipe 9, a cable-through water injection wellhead 11, a flow automatic controller 12, a ground control cabinet 13, and a remote measurement and control service terminal 14.

[0106] Among them, the cable expansion packer 5, cable connector 6, cable protector 7, cable-through water injection wellhead 11, flow automatic controller 12, ground control cabinet 13, and remote measurement and control service terminal 14 are all existing technologies and can be purchased from the market, and those skilled in the art are aware of this.

[0107] The plug 1 is used to seal the bottom of the pipe column to make the pipe column as a whole sealed.

[0108] The sand settling tail pipe 2 is a part of the water injection oil pipe 9, and is designed between the wire plug 1 and the constant pressure sand settling well washing valve 2, and is used to deposit formation sand and other impurities to ensure the quality of water injection.

[0109] The working principle of the constant pressure sand settling well washing valve 3 is similar to that of the check valve. The tool is designed with a backwash well channel and a sand settling channel, and has the functions of well washing and sand settling. The tool adopts a double valve design, the valve ball is made of titanium carbide, and the valve ball seat is made of tungsten carbide, which has good corrosion resistance and acid resistance. One set of the valve design is installed with a spring, which can press the ball tightly on the ball seat, and the backwash well has an opening pressure (1-5MPa). This design not only enhances the sealing during normal water injection, but also effectively prevents formation spitting when injection is stopped.

[0110] An intelligent measurement and control device 4 is installed corresponding to each water injection layer segment, which is used to monitor and collect data on pressure, temperature and flow of each layer, and control the injection water volume by controlling the operation of the rotary electric drive regulating short section 31 on the ground.

[0111] The cable expansion packer 5 is used for layered sealing between water injection layers. When water is injected, the pressure difference between the inside and outside of the oil pipe exceeds 0.8MPa, and the packer rubber cylinder automatically expands and sets. When injection is stopped or the well is backwashed, the packer rubber cylinder automatically retracts and releases the setting state. The cable expansion packer 5 is provided with cable crossing devices above and below to realize the overall crossing, fixing and sealing of the steel pipe cable, and this process will not affect the normal operation of the packer rubber cylinder.

[0112] The cable connector 6 is used for connection and insulation sealing between cables.

[0113] The cable protector 7 is used to fix the signal cable on the outer wall of the oil pipe.

[0114] The signal cable 8 is used to connect the control cabinet and the underground intelligent measurement and control water distribution device to realize the power supply and signal bidirectional transmission of the underground device.

[0115] The cable-traversable water injection wellhead 11 is a special wellhead device that can enable the downhole cable to pass through the upper flange from the oil pipe hanger and has a pressure-bearing sealing function for the cable.

[0116] The ground control cabinet 13 is installed near the wellhead, and the cabinet integrates a data acquisition control system to control the intelligent measurement and control devices 4 at each layer underground, thereby realizing ground control over the underground. It should be noted that the ground control cabinet 13 is a commonly used control equipment in the well site, and technicians in this field are clear about this.

[0117] The flow automatic controller 12 is used to control the water injection volume of the entire well, and can cooperate with the downhole intelligent measurement and control device 4 to complete the calibration of the flow of each layer downhole.

[0118] Example 2

[0119] This embodiment describes in detail the structure of the intelligent measurement and control device 4 in the pipe string described in Embodiment 1.

[0120] like Figure 2 As shown, the first intelligent measurement and control device 4-1 and the second intelligent measurement and control device have the same structure and are collectively referred to as the intelligent measurement and control device 4. The intelligent measurement and control device 4 includes an upper joint 15, a union adjustment ring 16, a center tube 17, an outer casing 18, a measurement and control integrated short joint 19, a water outlet fixing ring 20, a water outlet adjustment ring 21, an anti-reverse spring 22, a spring adjustment ring 23, a fastening ring 24, and a lower joint 25.

[0121] The connection method is as follows: taking the test integrated short section 19 as a reference, the central tube 17 is plugged into the upper end surface of the test integrated short section 19, the outer casing 18 is connected to the outer wall of the upper end of the test integrated short section 19 through threads, the upper joint 15 is plugged into the central tube 17, the union adjustment ring 16 is inserted from the upper end, and is connected to the outer casing 18 through threads;

[0122] The lower end of the test integrated short section 19 is connected to the water outlet fixing ring 20 by means of threads, the water outlet adjusting ring 21 and the anti-reverse spring 22 are inserted from the lower end of the test integrated short section 19, the spring adjusting ring 23 is connected to the test integrated short section 19 by means of threads to tighten the anti-reverse spring 22, the lower joint 25 is plugged into the test integrated short section 19, the fastening ring 24 is inserted from the lower end of the lower joint 25, and is connected to the test integrated short section 19 by means of threads to tighten the lower joint 25.

[0123] like Figure 4 As shown, the upper end of the integrated measuring and controlling short section 19 of the intelligent measuring and controlling device 4 is also threadedly connected with an external pressure test module 29, a rotary electric drive regulating short section 31, a back hole pressure test module 32, an internal pressure test module 33, and a temperature test module 34; it also includes a central tube 17 installed in a plug-in manner, an internal pin sealing module 28, and a control circuit module 30. The tail wires of all the test modules are connected to the control circuit module 30.

[0124] like Figure 6 As shown, the wall of the measurement and control integrated short section 19 is provided with an axial flow test channel 51 and a first mounting countersunk hole, the hole back pressure test module 32 is arranged at the upper end of the flow test channel 51, the bottom of the first mounting countersunk hole is provided with a shaft shoulder, and the rotary electric drive control short section 31 is inserted into the first mounting countersunk hole and sits on the shaft shoulder;

[0125] The flow test channel 51 is connected to the inner cavity of the measurement and control integrated short section 19 through the diversion hole 50. The side wall of the flow test channel 51 is provided with a flow test water outlet hole 54 connected to the first installation countersunk hole. The first installation countersunk hole is provided with a water outlet 55. The water outlet 55 is blocked by the water outlet adjustment ring 21. The rotary electric drive control short section 31 can control the communication between the flow test water outlet hole 54 and the water outlet 55.

[0126] An orifice plate 52 is disposed in the flow test channel 51 , and an orifice plate pressing ring 53 is disposed above the orifice plate 52 . The orifice plate pressing ring 53 presses the orifice plate 52 onto the inner step of the flow test channel 51 .

[0127] like Figure 8 As shown, an internal pressure hole 56 and an external pressure hole 57 are provided on the wall of the measurement and control integrated short section 19; the internal pressure test module 33 is connected with the internal pressure hole 56 for testing the internal pressure, and the external pressure test module 29 is connected with the external pressure hole 57 for testing the external pressure. The internal pressure hole 56 connects the internal pressure test module 33 with the inside of the measurement and control integrated short section 19, and the external pressure hole 57 connects the external pressure test module 29 with the outside of the measurement and control integrated short section 19.

[0128] like Figure 5As shown, the rotary electric drive control short section 31 of the intelligent measurement and control device 4 also includes an adjusting fixed valve 35, a movable valve plate adjusting shaft 36, a regulating valve spring 37, a regulating valve sealing short section 38, a coupling 39, a motor connector 40, a thrust drive shaft 41, a motor adapter 42, a reduction motor 43, a protective cover 44, an end cap 45, a water inlet groove 46, a movable waist-shaped hole 47, and a fixed waist-shaped hole 48.

[0129] The connection method is as follows: the upper end of the regulating fixed valve 35 is closed, the regulating fixed valve 35, the regulating valve sealing nipple 38, and the motor connector 40 are connected by threads from top to bottom in sequence, the inner wall of the lower end of the motor connector 40 is threadedly connected to the motor adapter 42, the outer wall of the lower end is threadedly connected to the protective sleeve 44, and the lower end of the protective sleeve 44 is threadedly connected to the end cap 45; the reduction motor 43 is installed at the lower end of the motor adapter 42 and fixed by screws; a countersunk hole is provided at the center of the inner wall of the upper end of the regulating fixed valve 35, and the movable valve plate regulating shaft 36 is inserted into the movable valve plate regulating shaft 36. In the countersunk hole, the regulating valve spring 37 is installed on the lower end of the movable valve plate regulating shaft 36 and is compressed by the regulating valve sealing short section 38. The lower end of the movable valve plate regulating shaft 36 is connected to the upper end of the thrust transmission shaft 41 through the first coupling 39-1. The movable valve plate regulating shaft 36 and the thrust transmission shaft 41 pass through the regulating valve sealing short section 38 and the motor connector 40 in turn; the lower end of the thrust transmission shaft 41 is connected to the output shaft of the reduction motor 43 through the second coupling 39-2, and the tail wire of the reduction motor 43 passes through the end cap and is connected to the control circuit module 30.

[0130] The upper end of the regulating fixed valve 35 is provided with a through fixed waist-shaped hole 48 , the valve plate of the movable valve plate regulating shaft 36 is provided with a movable waist-shaped hole 47 , and the valve wall of the regulating fixed valve 35 is provided with a water inlet groove 46 .

[0131] Under the control of the control circuit module 30 , the reduction motor 43 works to drive the thrust transmission shaft 41 and the movable valve plate adjustment shaft 36 to rotate.

[0132] like Figure 3 As shown, a wire passing module is also provided, and the wire passing module includes an outer pin sealing head 26, a lead hole 27 and an inner pin sealing module 28;

[0133] The outer pin sealing head 26 is installed at the upper end of the lead hole 27 by threaded connection, and the inner pin sealing module 28 is installed at the lower end of the lead hole by plugging and fixed with screws;

[0134] The wire passing module is arranged on the first upper joint 15 , the first lower joint 25 , and the measurement and control integrated short section 19 , so that the signal cable can pass through the intelligent measurement and control device 4 .

[0135] The specific configuration on the first upper connector 15 is as follows: Figure 3As shown, the lead-in hole 27 is arranged on the wall of the first upper joint 15, and the axis is parallel to the upper joint 15, so that the upper end face and the lower end face of the first upper joint 15 are connected, the outer pin sealing head 26 is installed on the upper end of the lead-in hole 27 by threaded connection, and the inner pin sealing module 28 is installed on the lower end of the lead-in hole 27 by plugging and fixed with screws. The tail of the outer pin sealing head 26 is connected to the wire, and the wire is connected to the inner pin sealing module 28 after passing through the lead-in hole 27.

[0136] Example 3

[0137] This embodiment is a detailed description of the method for using the expandable intelligent measurement and control injection string in Embodiment 1 and Embodiment 2. Figure 1 , Figure 6 .

[0138] S1. Run the tool string

[0139] The tools are connected in sequence through the water injection oil pipe 9, and the distance between the tools is adjusted by the number of oil pipes, so that the cable expansion packer 5 is located near the barrier between the two water injection layer sections. The intelligent measurement and control device 4 corresponds to each water injection layer section. The signal cable 8 is connected to the first intelligent measurement and control device 4-1 and the second intelligent measurement and control device 4-2 in sequence, and passes through the cable expansion packer 5. Each oil pipe uses a cable protector 7 to fix the signal cable 8 on the outer wall of the oil pipe. The water injection oil pipe 9 is suspended at the water injection wellhead 11 that can pass through the cable, and the cable passes through the wellhead and is connected to the ground control cabinet 13;

[0140] S2, Trial injection and sealing

[0141] The remote measurement and control service terminal 14 controls the intelligent measurement and control device 4 at each layer to turn on the water nozzle switch, and water begins to be injected into the ground. The incoming water enters the intelligent measurement and control device 4 through the water injection oil pipe 9, and the rotary electric drive control short section 31 adjusts the water volume and then flows out from the water outlet 55. At this time, it is necessary to overcome the spring force of the anti-reverse spring 22 to push the water outlet adjustment ring 21 to inject into the formation. The water injection process will generate a throttling pressure difference between the inside and outside of the water injection oil pipe 9 (the internal pressure is greater than the external pressure). Under the action of the throttling pressure difference, the rubber cylinder of the cable expansion seal 5 automatically expands to complete the sealing and separate the water injection layer section.

[0142] S3. Well washing

[0143] Stop water injection, the casing pressure is balanced, the throttling pressure difference inside and outside the tubing disappears, and the packer rubber tube is automatically retracted to complete the unsealing. Adopt the reverse circulation well washing mode, the well washing fluid enters the water injection tubing 9 from the casing 10 through the constant pressure sand settling well washing valve 3 and then returns to the ground.

[0144] S4. Test and Adjustment

[0145] The sensors in the intelligent measurement and control device 4 collect the pressure and temperature values ​​inside and outside the downhole oil pipe. The internal pressure test module 33 is connected with the central flow channel 49 through the internal pressure hole 56 to collect the pressure data inside the oil pipe. The external pressure test module 29 is connected with the casing 10 through the external pressure hole 57 to collect the pressure data of the oil pipe and the casing annulus. The post-hole pressure test module 32 is connected with the flow test channel 51 to collect the pressure data after the incoming water flows through the orifice plate 52. The temperature test module 34 collects temperature data.

[0146] Part of the injected water enters the flow test channel 51 through the diversion hole 50 at the lower end of the central flow channel 49 of the second intelligent measurement and control device 4-2, and part of the injected water continues to be injected into the first intelligent measurement and control device 4-1 of the lower layer; the incoming water enters the flow test channel 51 and passes through the orifice plate 52, and the orifice plate 52 is pressed tightly in the flow test channel 51 by the orifice plate pressure ring 53. Two different pressure values ​​are formed before and after the orifice plate 52. The pressure value before the orifice plate 52 is equal to the pressure value inside the oil pipe, which is Pinner, and is collected by the internal pressure test module 33. The pressure value Phole after the orifice plate 52 is collected by the post-orifice pressure test module 32. The inner hole area of ​​the orifice plate 52 is a different fixed value A0 according to different flow test ranges. The flow rate q of this layer can be calculated using the differential pressure flow calculation formula v :

[0147]

[0148] The outflow coefficient C can be expressed as:

[0149] C=0.5961+0.0261β 2 -0.216β 8 (2)

[0150] β=d / D (3)

[0151] Where: C-outflow coefficient;

[0152] β-diameter ratio;

[0153] d-throttle hole diameter;

[0154] D-flow channel diameter (inner diameter of flow test channel 51);

[0155] ΔP-pressure difference, ΔP=P 内 -P 孔 ;

[0156] A 0 - Orifice area;

[0157] ρ - fluid density.

[0158] After the incoming water flows out of the flow test water outlet 54, it enters the rotary electric drive control short section 31 through the water inlet trough 46. There are two symmetrical waist-shaped holes on the adjustment fixed valve 35 and the movable valve plate adjustment shaft 36. The fixed valve and the movable valve plate are completely fitted, and the metal seal is adopted. The adjustment valve spring 37 is pressed, and the movable valve plate adjustment shaft 36 is driven by the reduction motor 43 to rotate radially. When the two waist-shaped holes of the adjustment fixed valve 35 and the movable valve plate adjustment shaft 36 are completely overlapped, the water volume is the largest. As the movable valve plate adjustment shaft 36 continues to rotate, the overlap area of ​​the two waist-shaped holes will become smaller and smaller, and the water volume will also decrease accordingly. When the two waist-shaped holes on the adjustment fixed valve 35 and the movable valve plate adjustment shaft 36 do not overlap at all, the water volume is zero. When the water volume changes, the differential pressure before and after the orifice plate 52 will also change accordingly, and different flow values ​​can be obtained according to the flow calculation formula. Finally, the incoming water flows out from the water outlet 55 through the movable waist-shaped hole 47 and the fixed waist-shaped hole 48, pushes open the water outlet regulating ring 21 and is injected into the stratum.

[0159] According to the allocation requirements of each layer, the remote measurement and control service terminal 14 issues control instructions to adjust the water volume of the intelligent measurement and control device 4 on each layer until the allocation requirements are met. After the collected data is processed by the processor, it is uploaded to the ground control cabinet 13 through the signal cable 8, and the ground control cabinet 13 then sends it to the remote measurement and control service terminal 14 by wired or wireless means.

[0160] Example 4

[0161] This embodiment describes in detail the structure of the constant-pressure sand settling and well-washing valve 3 in the pipe string described in Embodiment 1.

[0162] like Figure 7 As shown, the constant pressure sand settling and well washing valve 3 includes a second upper joint 58 , an outer pipe 59 , a sand control valve, a connecting nipple 67 , a flow divider 68 , and a second lower joint 69 .

[0163] The connection method is that the second upper joint 58, the outer tube 59, the diverter 68, and the second lower joint 69 are connected in sequence by threads; wherein the lower end of the outer tube 59 is connected to the outer wall of the upper end of the diverter 68, and the upper end of the second lower joint 69 is connected to the outer wall of the lower end of the diverter 68.

[0164] A second sink hole is provided at the center of the upper end of the flow divider 68, a well-washing water inlet hole 70 is provided on the side wall of the sink hole to connect the second sink hole with the outside, and an axial sand settling channel 71 is provided on the hole wall of the flow divider 68;

[0165] The connecting short section 67 is connected to the upper end of the second counterbore, and the sand prevention valve is arranged at the upper end of the connecting short section 67 .

[0166] The anti-sand valve comprises a flow guide ball cover 60, a large spring 61, a valve ball 62, a valve seat 63, a valve seat sleeve 64, a ball stop cover 65, a small spring 66,

[0167] The guide ball cover 60 is threadedly connected to the valve seat sleeve 64. The upper end of the guide ball cover 60 is connected to the outer cone spring seat. The large spring 61, the first valve ball, and the first valve seat are arranged in sequence under the outer cone spring seat. The valve seat sleeve 64 is provided with a step, and the ball cover 65, the small spring 66, the valve ball 62, and the second valve seat are arranged under the step. The lower end of the valve seat sleeve 64 is connected to the upper end of the connecting short section 67.

[0168] The ball blocking cover 65 is provided with through holes or is a spoke wheel structure.

[0169] When this embodiment is used:

[0170] like Figure 7 As shown in the direction of the solid arrow in the middle, during reverse circulation well washing, the well washing fluid flows from the casing 10 through the well washing water inlet 70 of the constant pressure sand settling well washing valve 3 into the well washing channel 72, overcomes the spring force and opens the valve ball 62 at a constant pressure, allowing the well washing fluid to flow out, enter the water injection oil pipe 9, and then return to the ground.

[0171] like Figure 7 As shown in the direction of the hollow arrow, when well washing or water injection is stopped, the formation return material or the granular impurities during water injection are guided by the outer cone spring seat and fall into the sand settling tail pipe 2 through the sand settling channel 71, thereby preventing the valve ball from being buried and causing well washing to be blocked.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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. An expandable intelligent measurement and control injection string, including a water injection oil pipe, characterized in that: It also includes an intelligent measurement and control device, a cable expansion packer, and a constant pressure sand settling and well washing valve arranged on the water injection oil pipe; The constant pressure sand settling well washing valve is arranged at the lower end of the water injection oil pipe; At least two intelligent measurement and control devices are arranged above the constant pressure sand settling and well washing valve, and each intelligent measurement and control device corresponds to a water injection layer; a cable expansion packer is arranged between every two intelligent measurement and control devices; The intelligent measurement and control device comprises a measurement and control integrated short section and a water control device arranged on the measurement and control integrated short section.

2. The expandable intelligent measurement and control injection string according to claim 1 is characterized in that: The intelligent measurement and control device also includes a first upper joint, a central tube, an outer casing, a water outlet fixing ring, a water outlet adjustment ring, an anti-reverse spring, a spring adjustment ring, a fastening ring, and a first lower joint; Taking the test integrated short section as the reference, the central tube is plugged into the upper end face of the test integrated short section, the outer casing is connected to the outer wall of the upper end of the test integrated short section through threads, and the upper joint is plugged into the central tube. The lower end of the test integrated short section is connected to the water outlet fixing ring through a thread, the water outlet adjustment ring and the anti-reverse spring are inserted from the lower end of the test integrated short section in sequence, and the spring adjustment ring is connected to the lower end of the test integrated short section through a thread to compress the anti-reverse spring. The lower end of the first upper joint is connected to the upper end of the central tube, and the upper end of the outer casing is provided with a union adjustment ring to fasten the first upper joint; The first lower joint is plugged into the lower end of the test integrated short section, the fastening ring is inserted from the lower end of the lower joint, and is connected to the test integrated short section through threads to tighten the lower joint.

3. The expandable intelligent measurement and control injection string according to claim 2 is characterized in that: An axial flow test channel and a first mounting countersunk hole are arranged on the wall of the measurement and control integrated short section; a hole back pressure test module is arranged at the upper end of the flow test channel, a shaft shoulder is arranged at the bottom of the first mounting countersunk hole, and a rotary electric drive control short section is arranged on the shaft shoulder; The flow test channel is connected to the inner cavity of the measurement and control integrated short section through a diversion hole. The side wall of the flow test channel is provided with a flow test water outlet hole connected to the first installation countersunk hole. The first installation countersunk hole is provided with a water outlet, and the water outlet is blocked by a water outlet regulating ring. The rotary electric drive regulating short section controls the connection between the flow test water outlet hole and the water outlet.

4. The expandable intelligent measurement and control injection string according to claim 3 is characterized in that: The rotary electric drive control sub comprises a rotary control valve and a drive mechanism; The rotary regulating valve comprises a regulating fixed valve, a movable valve plate regulating shaft, a regulating valve spring, and a regulating valve sealing nipple; the upper end of the regulating fixed valve is closed, the upper end of the regulating valve sealing nipple is connected to the lower end of the regulating fixed valve, the front end of the movable valve plate regulating shaft is inserted into the central countersunk hole of the regulating fixed valve, and the rear end is inserted into or passes through the central hole of the regulating valve sealing nipple, a valve plate is arranged on the movable valve plate regulating shaft, the regulating valve spring is arranged between the valve plate and the regulating valve sealing nipple, and the upper end surface of the valve plate is in contact with the inner end surface of the regulating fixed valve; The upper end of the regulating fixed valve is provided with a through fixed waist-shaped hole, the valve plate of the movable valve plate regulating shaft is provided with a movable waist-shaped hole, and the valve wall of the regulating fixed valve is provided with a water inlet groove; The lower end of the movable valve plate regulating shaft is connected to the output shaft of the driving mechanism, and the upper end of the driving mechanism is connected to the lower end of the regulating valve sealing nipple.

5. The expandable intelligent measurement and control injection string according to claim 4 is characterized in that: The upper end surface of the measurement and control integrated short section is also threadedly connected with an external pressure test module, a rotary electric drive control short section, a backhole pressure test module, an internal pressure test module, and a temperature test module; and also includes a control circuit module installed in a plug-in manner; The tail wires of all test modules are connected to the control circuit module; the external cables of the control circuit are aggregated into downhole signal cables; An orifice plate is arranged in the flow test channel, and an orifice plate pressing ring is arranged above the orifice plate. The orifice plate pressing ring presses the orifice plate tightly onto the inner step of the flow test channel.

6. The expandable intelligent measurement and control injection string according to claim 5 is characterized in that: An internal pressure hole and an external pressure hole are provided on the wall of the measurement and control integrated short section; the internal pressure hole connects the internal pressure test module with the inside of the measurement and control integrated short section, and the external pressure hole connects the external pressure test module with the outside of the measurement and control integrated short section.

7. The expandable intelligent measurement and control injection string according to claim 6 is characterized in that: The driving mechanism includes a motor connector, a thrust transmission shaft, a motor adapter, a reduction motor, a protective sleeve, and an end cap; The upper end of the motor connector is connected to the lower end of the regulating valve sealing nipple, the inner wall of the lower end of the motor connector is threadedly connected to the motor adapter, the outer wall of the lower end is threadedly connected to the protective sleeve, and the lower end of the protective sleeve is threadedly connected to the end cap; The reduction motor is installed at the lower end of the motor adapter and fixed by screws; The lower end of the movable valve plate adjusting shaft is connected to the upper end of the thrust transmission shaft through a first coupling, and the movable valve plate adjusting shaft and the thrust transmission shaft pass through the regulating valve sealing nipple and the motor connector in sequence; the lower end of the thrust transmission shaft is connected to the output shaft of the reduction motor through a second coupling, and the tail wire of the reduction motor passes through the end cap and is connected to the control circuit module; under the control of the control circuit module, the reduction motor drives the thrust transmission shaft and the movable valve plate adjusting shaft to rotate.

8. The expandable intelligent measurement and control injection string according to claim 7 is characterized in that: It also includes a wire passing module, which includes an external pin sealing head, a wire lead hole and an internal pin sealing module; The outer pin sealing head is installed at the upper end of the lead hole by threaded connection, and the inner pin sealing module is installed at the lower end of the lead hole by plugging and fixed with screws; The wire passing module is arranged on the first upper joint, the first lower joint, and the measurement and control integrated short section, so that the signal cable can pass through the intelligent measurement and control device.

9. The expandable intelligent measurement and control injection string according to claim 8 is characterized in that: It also includes a water injection wellhead that can be traversed by cables, a flow automatic controller, a ground control cabinet, and a remote measurement and control service terminal; The upper end of the water injection oil pipe is connected to the water injection wellhead that can pass through the cable, the flow automatic controller is connected to the measurement port of the water injection wellhead that can pass through the cable, the ground control cabinet is set at the well site, and the remote transmission measurement and control service terminal is connected to the ground control cabinet through the network; A cable connector and a cable protector are arranged between the topmost intelligent measurement and control device and the traversable cable water injection wellhead; the uphole signal cable of the ground control cabinet passes through the traversable cable water injection wellhead, is connected to the upper end of the cable connector through the cable protector, and an downhole signal cable is installed at the lower end of the cable connector.

10. The expandable intelligent measurement and control injection string according to any one of claims 1 to 9, characterized in that: A constant-pressure sand settling and well-washing valve is arranged at the lower end of the water injection oil pipe, a sand settling tail pipe is arranged at the lower end of the constant-pressure sand settling and well-washing valve, and a thread plug is arranged at the bottom of the sand settling tail pipe.

11. The expandable intelligent measurement and control injection string according to claim 10, characterized in that: The constant-pressure sand settling and well-washing valve comprises a second upper joint, an outer pipe, a sand prevention valve, a connecting nipple, a flow divider, and a second lower joint. The second upper joint, the outer tube, the flow divider, and the second lower joint are connected in sequence by threads; wherein the lower end of the outer tube is connected to the outer wall of the upper end of the flow divider, and the upper end of the second lower joint is connected to the outer wall of the lower end of the flow divider; A second countersunk hole is arranged at the center of the upper end of the flow divider, an oil-washing well water inlet hole is arranged on the side wall of the countersunk hole to connect the second countersunk hole with the outside, and an axial sand settling channel is arranged on the hole wall of the flow divider; The connecting short section is connected to the upper end of the second counterbore, and the sand prevention valve is arranged on the upper end of the connecting short section.

12. The expandable intelligent measurement and control injection string according to claim 11, characterized in that: The anti-sand valve comprises a guide ball cover, a large spring, a valve ball, a valve seat, a valve seat sleeve, a ball cover and a small spring; The guide ball cover is threadedly connected to the valve seat sleeve, the upper end of the guide ball cover is connected to the outer cone spring seat, and a large spring, a first valve ball, and a first valve seat are arranged under the outer cone spring seat in sequence; A step is arranged inside the valve seat sleeve, and a ball retaining cover, a small spring, a valve ball and a second valve seat are arranged under the step; The lower end of the valve seat sleeve is connected to the upper end of the connecting nipple; The ball stop cover is provided with a through hole or the ball stop cover is a spoke wheel structure.

13. The method for using the expandable intelligent measurement and control injection string is characterized in that: The following steps are involved: S1. Connect the tool and put it into the tool string The tools are connected in sequence through the water injection oil pipe, and the intelligent measurement and control device is connected in sequence with the signal cable, and passes through the cable expansion packer. The water injection oil pipe is hung at the water injection wellhead that can pass through the cable, and the cable passes through the wellhead and is connected to the ground control cabinet; S2, Trial injection and sealing Turn on the water nozzle switch, and water starts to be injected on the ground. The incoming water enters the intelligent measurement and control device through the water injection oil pipe. The rotary electric drive control short section adjusts the water volume and then flows out from the water outlet. At this time, the spring force of the anti-reverse spring must be overcome to push the water outlet adjustment ring open before it can be injected into the formation. The internal pressure is greater than the external pressure. Under the action of the throttling pressure difference, the rubber cylinder of the cable expansion packer automatically expands to complete the sealing and separate the water injection layer section. S 3. Well washing Stop water injection, the casing pressure is balanced, the throttling pressure difference inside and outside the tubing disappears, and the packer rubber tube is automatically retracted to complete the unsealing; adopt the reverse circulation well washing mode, the well washing fluid enters the water injection tubing from the casing through the constant pressure sand settling well washing valve and then returns to the ground; S4, water injection, testing and adjustment The sensors in the intelligent measurement and control device collect the pressure and temperature values ​​inside and outside the downhole oil pipe. The ground control cabinet calculates the flow rate of the formation where the intelligent measurement and control device is located, and adjusts the water volume until the injection requirements are met.

14. The method for using the expandable intelligent measurement and control injection string according to claim 13, characterized in that: Follow these steps to make the adjustment: S1. Connect the tool and put it into the tool string The tools are connected in sequence through water injection oil pipes, and the distance between the tools is adjusted according to the number of oil pipes, so that the cable expansion packer is located near the barrier between the two water injection layer sections. The intelligent measurement and control device corresponds to each water injection layer section. The signal cable is connected to the intelligent measurement and control device in sequence and passes through the cable expansion packer. A cable protector is used for each oil pipe to fix the signal cable on the outer wall of the oil pipe. The water injection oil pipe is hung at the water injection wellhead that can pass through the cable, and the cable passes through the wellhead and is connected to the ground control cabinet.

15. The method for using the expandable intelligent measurement and control injection string according to claim 13, characterized in that: Follow these steps to make the adjustment: S2, Trial injection and sealing The remote measurement and control service terminal controls the intelligent measurement and control devices on each layer to turn on the water faucet switch, and water begins to be injected on the ground. The incoming water enters the intelligent measurement and control device through the water injection oil pipe. The rotary electric drive control short section adjusts the water volume and then flows out from the water outlet. At this time, it is necessary to overcome the spring force of the anti-reverse spring to push open the water outlet adjustment ring before injecting into the formation. The water injection process will generate a throttling pressure difference inside and outside the water injection oil pipe. The internal pressure is greater than the external pressure. Under the action of the throttling pressure difference, the rubber cylinder of the cable expansion packer automatically expands to complete the sealing and separate the water injection layer section.

16. The method for using the expandable intelligent measurement and control injection string according to claim 13, characterized in that: Follow these steps to make the adjustment: S4, water injection, testing and adjustment The sensors in the intelligent measurement and control device collect the pressure and temperature values ​​inside and outside the downhole oil pipe. The internal pressure test module is connected to the central flow channel through the internal pressure hole to collect the pressure data inside the oil pipe. The external pressure test module is connected to the casing through the external pressure hole to collect the pressure data of the oil pipe and the casing annulus. The post-hole pressure test module is connected to the flow test channel to collect the pressure data after the incoming water flows through the orifice plate. The temperature test module collects temperature data. Part of the injected water enters the flow test channel through the diversion hole at the lower end of the central flow channel of the intelligent measurement and control device, and part of it continues to be injected into the lower intelligent measurement and control device; the incoming water enters the flow test channel and passes through the orifice plate, which is pressed tightly in the flow test channel by the orifice plate pressure ring. Two different pressure values ​​are formed before and after the orifice plate. The pressure value before the orifice plate is equal to the pressure value inside the oil pipe, which is Pinner, collected by the internal pressure test module, and the pressure value behind the orifice plate Phole is collected by the back-hole pressure test module. The inner hole area of ​​the orifice plate is a different fixed value A0 according to different flow test ranges. The flow rate q of this layer can be calculated using the differential pressure flow calculation formula v : The outflow coefficient C can be expressed as: C＝0.5961+0.0261β 2 -0.216β 8 (2) β=d / D (3) Where: C-discharge coefficient; β-diameter ratio; d-throttle diameter; D-flow channel diameter, i.e. the inner diameter of the flow test channel; ΔP-pressure difference, ΔP=P 内 -P 孔 ; A0-throttling orifice area; ρ-fluid density. According to the allocation requirements of each layer, the remote measurement and control service terminal issues control instructions to adjust the water volume of the intelligent measurement and control devices on each layer until the allocation requirements are met. After the collected data is processed by the processor, it is uploaded to the ground control cabinet through the signal cable, and the ground control cabinet then sends it to the remote measurement and control service terminal via wired or wireless means.

17. The method for using the expandable intelligent measurement and control injection string according to claim 16, characterized in that: In the intelligent measurement and control device, the incoming water flows out from the flow test water outlet and enters the rotary electric drive control short section through the water inlet tank. There are two symmetrical waist-shaped holes on the adjusting shaft of the fixed valve and the movable valve plate. The fixed valve and the movable valve plate are completely fitted, and a metal seal is adopted. The adjusting valve spring is used to tighten the movable valve plate adjusting shaft, and the movable valve plate adjusting shaft is driven by the reduction motor to rotate radially. When the two waist-shaped holes on the adjustment shaft of the fixed valve and the movable valve plate are completely overlapped, the water volume is the largest. As the movable valve plate adjustment shaft continues to rotate, the overlapping area of ​​the two waist-shaped holes will become smaller and smaller, and the water volume will also decrease accordingly. When the two waist-shaped holes on the adjustment shaft of the fixed valve and the movable valve plate do not overlap at all, the water volume is zero. As the water volume changes, the differential pressure before and after the orifice plate will also change. Different flow values ​​can be obtained according to the flow calculation formula. Finally, the incoming water flows out from the water outlet after passing through the movable waist-shaped hole and the fixed waist-shaped hole, pushing open the water outlet regulating ring and injecting into the formation.

18. The expansion type intelligent measurement and control device for injection pipe string is characterized by: The intelligent measurement and control device includes a central tube, a measurement and control integrated short joint, an outer casing, a water outlet fixing ring, a water outlet adjustment ring, an anti-reverse spring, a spring adjustment ring, and a fastening ring; Taking the test integrated short section as the reference, the central tube is plugged into the upper end face of the test integrated short section, the outer casing is connected to the outer wall of the upper end of the test integrated short section through threads, and the upper joint is plugged into the central tube. The lower end of the test integrated short section is connected to the water outlet fixing ring through a thread, the water outlet adjustment ring and the anti-reverse spring are inserted from the lower end of the test integrated short section in sequence, and the spring adjustment ring is connected to the lower end of the test integrated short section through a thread to compress the anti-reverse spring; An axial flow test channel and a first mounting countersunk hole are arranged on the wall of the measurement and control integrated short section; a hole back pressure test module is arranged at the upper end of the flow test channel, a shaft shoulder is arranged at the bottom of the first mounting countersunk hole, and a rotary electric drive control short section is arranged on the shaft shoulder; The flow test channel is connected to the inner cavity of the measurement and control integrated short section through a diversion hole. The side wall of the flow test channel is provided with a flow test water outlet hole connected to the first installation countersunk hole. The first installation countersunk hole is provided with a water outlet, and the water outlet is blocked by a water outlet regulating ring. The rotary electric drive regulating short section controls the connection between the flow test water outlet hole and the water outlet.

19. The expandable intelligent measurement and control device for injection pipe string according to claim 18, characterized in that: The rotary electric drive control sub comprises a rotary control valve and a drive mechanism; The rotary regulating valve comprises a regulating fixed valve, a movable valve plate regulating shaft, a regulating valve spring, and a regulating valve sealing nipple; the upper end of the regulating fixed valve is closed, the upper end of the regulating valve sealing nipple is connected to the lower end of the regulating fixed valve, the front end of the movable valve plate regulating shaft is inserted into the central countersunk hole of the regulating fixed valve, and the rear end is inserted into or passes through the central hole of the regulating valve sealing nipple, a valve plate is arranged on the movable valve plate regulating shaft, the regulating valve spring is arranged between the valve plate and the regulating valve sealing nipple, and the upper end surface of the valve plate is in contact with the inner end surface of the regulating fixed valve; The upper end of the regulating fixed valve is provided with a through fixed waist-shaped hole, the valve plate of the movable valve plate regulating shaft is provided with a movable waist-shaped hole, and the valve wall of the regulating fixed valve is provided with a water inlet groove; The lower end of the movable valve plate regulating shaft is connected to the output shaft of the driving mechanism, and the upper end of the driving mechanism is connected to the lower end of the regulating valve sealing nipple.

20. The expandable intelligent measurement and control device for injection pipe string according to claim 19, characterized in that: The upper end surface of the measurement and control integrated short section is also threadedly connected with an external pressure test module, a rotary electric drive control short section, a backhole pressure test module, an internal pressure test module, and a temperature test module; and also includes a control circuit module installed in a plug-in manner; The tail wires of all test modules are connected to the control circuit module. An orifice plate is arranged in the flow test channel, an orifice plate pressure ring is arranged above the orifice plate, and the orifice plate pressure ring presses the orifice plate tightly against the inner step of the flow test channel; An internal pressure hole and an external pressure hole are provided on the wall of the measurement and control integrated short section; the internal pressure hole connects the internal pressure test module with the inside of the measurement and control integrated short section, and the external pressure hole connects the external pressure test module with the outside of the measurement and control integrated short section.

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