Measurement and control integrated layered polymer injection tubular column and use method thereof

Abstract

The invention discloses a measurement and control integrated layered polymer injection pipe column and a using method thereof. The measurement and control integrated layered polymer injection pipe column comprises an oil pipe, a packer, a ground control cabinet, a cable and a quick return type electro-hydraulic composite polymer injection device. The oil pipe is provided with at least two quick return type electro-hydraulic composite polymer injection devices, and a packer is arranged between every two quick return type electro-hydraulic composite polymer injection devices; each quick return type electro-hydraulic composite polymer injection device corresponds to one oil layer; the packer is a cable control type high-thrust intelligent packer; and the ground control cabinet controls the quick return type electro-hydraulic composite polymer injection device and the cable control type high-thrust intelligent packer through cables. By adopting the quick return type electro-hydraulic composite polymer injection device and the cable control type high-thrust intelligent packer, intelligent control over the underground polymer injection device and the packer is achieved, and the digital level of the polymer injection process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of downhole layered injection equipment, in particular to a measurement and control integrated layered polymer injection string and a use method thereof. Background Art

[0002] Shengli Oilfield has abundant geological reserves after polymer flooding, but the recovery rate is low. After polymer flooding, the reservoir heterogeneity is stronger. Affected by the injection process, the recovery rate of existing chemical flooding is limited. Taking Chengdao Oilfield as an example, the tertiary oil recovery planning scope of this oilfield covers more than 220 million tons of geological reserves. Affected by factors such as the large number of small layers in the main reservoir, large permeability difference, and strong heterogeneity, joint injection is prone to interlayer interference, small layer blockage, and uneven injection between layers, which affects the development effect. Therefore, it is necessary to carry out fine injection.

[0003] At present, the main stratified polymer injection processes include concentric double-tube injection and hollow single-tube injection. Concentric double-tube polymer injection can only be injected in two layers, while the existing single-tube stratified polymer injection process has problems such as the failure of the measuring and adjusting instrument to be cast in place, the small torque of the measuring and adjusting instrument, the difficulty in adjusting the polymer dispenser, and the short effective period. The operation cost is high and it is not easy to promote. At the same time, the conventional Y341 well-washable packer is generally used as the polymer injection packer. During the application of the well-washing channel of this type of packer, the well-washing channel is small and the well-washing is not thorough, resulting in insufficient injection of the polymer injection well; secondly, after the well-washing channel is opened, it is easy to adsorb polymers, resulting in the well-washing channel being not tightly closed. Therefore, how to achieve reliable stratification, long-term regulation, and large-displacement backwashing wells is the main consideration at present.

[0004] Publication (Announcement) No.: CN106837275B, discloses a large-displacement single-tube layered polymer injection adjustable device, including a measuring and adjusting tool introduction mechanism, an injection volume adjustment mechanism and a polymer pressure reduction and viscosity preservation mechanism; the measuring and adjusting tool introduction mechanism has a guiding function and a positioning function; the injection volume adjustment mechanism has a spiral lifting and lowering injection core body, and the function of adjusting the injection volume of the polymer pressure reduction and viscosity preservation mechanism; the polymer pressure reduction and viscosity preservation mechanism has a shuttle wave injection flow channel with pressure reduction and viscosity preservation characteristics; the injection core body has a sufficient inner diameter to ensure the implementation of operations such as profile testing, and at the same time, the layered polymer injection and measurement and adjustment working cylinder has a bridge channel, which does not affect the polymer injection of other layers when the test operation is carried out in the current layer. The invention has the characteristics of large injection volume, good viscosity preservation, and adjustable injection volume, realizes single-tube layered polymer injection and measurement and adjustment of multi-layer segment injection, solves the difficulties currently faced by offshore oilfield layered polymer injection, and can effectively improve the utilization rate of polymers and oil recovery effect.

[0005] However, the prior art requires the tripping of instruments, especially in the late stage of polymer injection, because of the inner wall structure of the pipe string or polymer adhesion, it is difficult to run the measurement and adjustment instrument, which eventually leads to measurement and adjustment failure.

[0006] Publication (Announcement) No.: CN111663920B discloses a control method for controlling six-layer sliding sleeves by three pipelines, wherein three hydraulic pipelines are connected to the ground hydraulic control equipment and six downhole hydraulic control systems in sequence from the ground hydraulic station to the bottom of the well, wherein each downhole hydraulic control system corresponds to a reservoir to be mined, and a packer is arranged under each downhole hydraulic control system to separate the annulus in the wellbore so that each layer forms an independent space; the opening states of the decoders in the six downhole hydraulic control systems are controlled separately by controlling the oil pressure of the three hydraulic pipelines, after the decoder in the target downhole hydraulic control system is opened, according to the control requirement of controlling the moving direction of the sliding sleeve, the oil pressure supplied to the decoder by the corresponding hydraulic pipeline is controlled to be increased to the operating pressure required by the sliding sleeve, so that the passage between the decoder, the pressure relief valve, the sliding sleeve, the one-way valve and the oil pipe opening of the downhole hydraulic control system of the layer is connected, so as to promote the movement of the sliding sleeve and realize downhole layered control.

[0007] However, the existing technology has a complex structure, and the pipelines are numerous and long. Once damaged, the corresponding oil layer equipment will directly fail.

[0008] Publication (Announcement) No.: CN114482943A, discloses a layered polymer injection string for layered sand control wells and a method of use. It includes a thread plug, an electro-hydraulic integrated polymer distributor, a through-type sealing plug, a hydraulic control pipeline, an armored cable, a sand control casing, a polymer injection oil pipe, a positioner, a sand control cable-controlled high-thrust intelligent packer, a sand filter tube, and several pressure sensors. The invention adopts a single-tube layered injection method, and all supporting tools adopt a small-diameter design. The single-layer polymer distributor adopts a liquid-electric hybrid method to control the opening size. The interlayer packer adopts a multi-tube crossing method, and an electric control is used to adjust the liquid circuit to provide hydraulic pressure to the downhole tool. The DC stepper motor is controlled by a circuit board to rotate forward and reverse, and the liquid flow path is changed. Finally, the flow control of each oil and water layer is achieved through a ground hydraulic control pipeline + a signal cable.

[0009] This existing technology combines the advantages of rapid electric control and large hydraulic thrust regulation. However, after electric regulation in the application, the hydraulic control pressure of the underground electric-hydraulic integrated distributor is difficult to release, which prolongs the on-site construction period to a certain extent.

[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 measurement and control integrated stratified polymer injection string and a method of using the same. The string is provided with a cable-controlled large-thrust intelligent sealer, a fast-return hydraulic-electric composite polymer injection device, etc., and multiple sealer setting and downhole polymer injection adjustment are controlled simultaneously through one cable. Theoretically, the number of stratification levels is not limited, and all important tools are intelligently controlled, with the characteristics of quick and simple downhole stratification and rapid and convenient polymer injection adjustment.

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

[0013] A measurement and control integrated stratified polymer injection string, comprising an oil pipe, a packer, a ground control cabinet, a cable, and a quick-return hydraulic-electric composite polymer injection device; at least two quick-return hydraulic-electric composite polymer injection devices are arranged on the oil pipe, and a packer is arranged between every two quick-return hydraulic-electric composite polymer injection devices; each quick-return hydraulic-electric composite polymer injection device corresponds to an oil layer; the quick-return hydraulic-electric composite polymer injection device comprises a power mechanism, a transmission mechanism, and a graded polymer injection mechanism connected in sequence from top to bottom, and the ground control cabinet controls the power mechanism through a cable.

[0014] Furthermore, the power mechanism comprises a power tube, an outer sealing sleeve, and an inner sealing sleeve;

[0015] Specifically, the power tube is a stepped tube with a thin top and a thick bottom, the lower end of the outer sealing sleeve is threadedly connected to the upper end of the thick part of the power tube, and the inner sealing sleeve is arranged in the annulus between the power tube and the outer sealing sleeve, and the lower end is in contact with the upper end surface of the thick part of the power tube;

[0016] Specifically, the inner sealing sleeve is provided with two axial through holes, which are divided into a first through hole and a second through hole. The high-pressure pump is provided in the first through hole, and the sealing body is provided in the second through hole.

[0017] Specifically, the annulus between the power tube and the outer sealing sleeve is provided with a first motor and an oil chamber above the high-pressure pump, and a pressure hole is provided on the upper end wall of the thick portion of the power tube in the area corresponding to the first through hole, and the first motor can drive the high-pressure pump to pressurize the hydraulic oil in the oil chamber and spray it out from the pressure hole;

[0018] Specifically, the annulus between the power tube and the outer sealing sleeve is provided with a second motor and a first controller above the sealing body;

[0019] Specifically, the inner sealing sleeve is provided with an annular groove at the lower end to connect the first through hole with the lower end of the second through hole, so that the lower part of the sealing body becomes a first pressure relief hole, the inner wall of the inner sealing sleeve is provided with a second pressure relief hole to connect the second through hole with the inner wall of the inner sealing sleeve, the detailed wall of the power tube is provided with a third pressure relief hole in the area corresponding to the second pressure relief hole, and the second motor can pull the inner sealing sleeve upward;

[0020] Specifically, a refueling connector is arranged above the oil cavity at the upper end of the outer sealing sleeve, and a first cable connector is arranged above the first controller.

[0021] Furthermore, the transmission mechanism includes an upper connector, a middle connector, a lower connector, a first piston, a connecting rod, and a pressing sleeve;

[0022] Specifically, the inner wall of the lower end of the thick part of the power tube is connected to the outer wall of the upper end of the upper connector, the upper connector is provided with an axial through hole that coincides with the punching hole, and the first piston is placed inside the axial through hole of the upper connector;

[0023] Specifically, the inner wall of the upper end of the middle connector is connected to the outer wall of the lower end of the upper connector, the connecting rod is arranged in the middle connector, and the upper end of the connecting rod is movably connected to the lower end of the first piston, the lower connector is threadedly connected to the middle connector, the inner wall of the upper end of the lower connector is provided with a step, the track sleeve is arranged on the step, and the middle connector is connected to the lower connector to press the track sleeve;

[0024] Specifically, the track sleeve is provided with track nails, the outer wall of the connecting rod is provided with tracks, and the tracks cooperate with the track nails;

[0025] Specifically, the outer wall of the upper end of the pressing sleeve is connected to the inner wall of the lower end of the connecting rod, the lower connecting body is provided with a disc spring seat below the connecting rod, a disc spring is provided between the disc spring seat and the lower end surface of the connecting rod, the disc spring is sleeved on the outer wall of the pressing sleeve, and a vulcanized sealing body is provided between the inner wall of the lower connecting body and the outer wall of the pressing sleeve.

[0026] Specifically, the connecting rod outer wall track is a multi-level track provided with at least two "Y" shapes.

[0027] Furthermore, the graded polymer injection mechanism includes a throttling sleeve and a polymer injection sleeve;

[0028] Specifically, the upper end of the throttling sleeve is connected to the lower end of the pressing sleeve, the upper end of the injection sleeve is connected to the lower end of the lower connector, the inner wall of the injection sleeve is provided with an injection hole, and the outside of the throttling sleeve is provided with at least two external throttling units;

[0029] Specifically, at least two internal throttling units are arranged inside the polymer injection sleeve below the polymer injection hole;

[0030] Specifically, the inner throttling unit and the outer throttling unit are both spindle-shaped, and the surfaces of the inner throttling unit and the outer throttling unit are coated with polytetrafluoroethylene.

[0031] Further, the upper end of the power tube is connected to a first upper joint, and the lower end of the injection sleeve is connected to a first lower joint;

[0032] Specifically, the power tube is sealed with the upper end and the lower end of the outer sealing sleeve, the inner and outer surfaces of the inner sealing sleeve are sealed with the outer sealing sleeve and the power tube, the power tube is sealed with the upper connector, the middle connector is sealed with the upper connector, the injection sleeve is sealed with the lower connector, and the first lower joint is sealed with the injection sleeve.

[0033] Specifically, a downhole pressure and flow monitoring component is placed inside the sealed space formed by the outer sealing sleeve, the power tube and the inner sealing sleeve, and is controlled by the first controller.

[0034] Furthermore, the packer is a cable-controlled high-thrust intelligent packer;

[0035] The cable-controlled high-thrust intelligent packer comprises a downhole oil supply mechanism, a pressure-boosting and pressure-relieving mechanism, and a hydraulic setting mechanism which are sequentially connected from top to bottom.

[0036] Furthermore, the downhole oil supply mechanism includes an upper central pipe, an upper sealing head, a movable piston, an upper sealing sleeve, and an upper pressure-transmitting joint;

[0037] Specifically, the upper sealing head is arranged on the inner wall of the upper end of the upper sealing sleeve, the upper pressure-uploading joint is arranged on the inner wall of the lower end of the upper sealing sleeve, the floating piston is arranged in the upper sealing sleeve, the floating piston is between the upper sealing head and the upper pressure-uploading joint, the upper center tube passes through the upper sealing head and the floating piston, and the lower end is connected to the inner wall of the upper pressure-uploading joint;

[0038] Specifically, a balancing hole is provided on the wall of the upper central tube, and the balancing hole is between the upper sealing head and the movable piston;

[0039] Specifically, the upper pressure-transmitting joint is provided with an axially through oil outlet hole and an oil return hole, an oil outlet joint is provided at the lower end of the oil outlet hole, and an oil return joint is provided at the lower end of the oil return hole.

[0040] Furthermore, the pressure-increasing and pressure-relieving mechanism comprises an intermediate central tube, an intermediate sealing head, an intermediate sealing sleeve, and an intermediate pressure-transmitting joint;

[0041] Specifically, the upper end of the intermediate center tube is connected to the inner wall of the upper pressure transmission joint, the intermediate sealing head is sleeved on the intermediate center tube, the intermediate sealing head is provided with a second cable joint, the inner wall of the middle pressure transmission joint is connected to the lower end of the intermediate center tube, the upper end of the intermediate sealing sleeve is connected to the outer wall of the intermediate sealing head, and the lower end is connected to the middle pressure transmission joint;

[0042] Specifically, the intermediate sealing sleeve is provided with a circuit skeleton, a third motor, a plunger pump, a fourth motor, and a rotating assembly between the intermediate sealing head and the intermediate pressure transmission joint, the circuit skeleton is provided on the intermediate central tube, and the circuit skeleton is provided with a second controller;

[0043] Specifically, the middle pressure transmission joint is provided with an axially through plunger counterbore hole and an adapter hole, a plunger is provided in the plunger counterbore, the rotating assembly is connected to the plunger, the fourth motor drives the rotating assembly, the plunger pump is connected to the adapter hole to expose the hydraulic oil input end and the hydraulic oil output end, the third motor drives the plunger pump, a third rubber ring is provided between the plunger and the plunger counterbore, a pressure relief input hole is provided on the bottom surface of the plunger counterbore to connect the plunger counterbore with the outside, a pressure relief output counterbore is provided on the bottom surface of the middle pressure transmission joint, and the pressure relief output counterbore is connected with the plunger counterbore through a pressure relief channel;

[0044] Specifically, the pressure relief output counterbore is connected to the oil return joint through a first pipeline, and the hydraulic oil input end is connected to the oil outlet joint through a second pipeline.

[0045] Furthermore, the hydraulic setting mechanism includes a connector, a lower pressure transmission connector, a lower center pipe, a support sleeve, and a fixing ring;

[0046] Specifically, the upper end of the connector is connected to the inner wall of the middle pressure-transmitting joint, the lower end of the connector is connected to the inner wall of the lower pressure-transmitting joint, the upper end of the lower center tube is connected to the inner wall of the lower pressure-transmitting joint, the support sleeve is sleeved on the outer wall of the lower center tube, a concave ring is provided at the lower end of the lower pressure-transmitting joint, the support sleeve is connected to the concave ring of the lower pressure-transmitting joint, and the upper end of the inner wall of the fixing ring is connected to the lower end of the lower center tube;

[0047] Specifically, the support sleeve is covered with an adjusting ring, a setting rubber cylinder, and a starting piston;

[0048] Specifically, the upper end of the adjusting ring is connected to the lower end of the lower pressure transmission joint, the lower end of the starting piston is connected to the fixing ring through the starting shear pins, the upper end of the fixing ring is provided with an extension tube, the outer wall of the extension tube is in contact with the starting piston, the inner wall of the starting piston is provided with a force step, at least two setting rubber cylinders are provided between the adjusting ring and the starting piston, and a spacer ring is provided between every two setting rubber cylinders;

[0049] Specifically, the lower pressure transmission joint is provided with a sealing joint, a sealing passage is provided under the sealing joint, and the sealing passage is communicated with the annulus formed by the starting piston and the lower center pipe;

[0050] Furthermore, it also includes a tee, wherein the tee includes a collection pipeline, a pressure relief pipeline, and a sealing pipeline;

[0051] Specifically, the collecting pipeline is connected to the setting seal joint, the pressure relief pipeline is connected to the pressure relief input hole, and the setting seal pipeline is connected to the hydraulic oil output end of the plunger pump.

[0052] Further, a second upper joint is provided at the upper end of the upper central tube, and a second lower joint is provided at the lower end of the fixing ring;

[0053] Specifically, the second rubber ring is used to seal the upper center tube and the upper sealing head, the upper sealing head and the upper sealing sleeve, the movable piston and the upper sealing sleeve and the upper center tube, the upper pressure transmission joint and the upper sealing sleeve and the upper center tube, the middle sealing head and the middle center tube and the middle sealing sleeve, the middle pressure transmission joint and the middle sealing sleeve, the lower pressure transmission joint and the support sleeve, the support sleeve and the starting piston, and the starting piston and the fixed ring.

[0054] Furthermore, a guide wire plug is provided at the lower end of the oil pipe.

[0055] Specifically, the first controller is a first PLC programmable controller; the second controller is a second PLC programmable controller;

[0056] Specifically, the branch line of the cable is connected to the first cable connector of each fast-return type hydraulic-electric composite injection device and the second cable connector of the cable-controlled large-thrust intelligent packer, and the bus of the cable is connected to the ground control cabinet;

[0057] Specifically, the uppermost end of the oil pipe is connected to the wellhead, and a flow meter is provided at the wellhead input end.

[0058] A method for using a measurement and control integrated layered polymer injection column comprises the following steps:

[0059] S1. Fill the space between the floating piston and the pressure-uploading joint with hydraulic oil, lower the pipe string to the required position, make one fast-return hydraulic-electric composite injection device correspond to one oil layer, and finally connect the cable to the ground control cabinet;

[0060] S2, setting the pipe string;

[0061] S3. When the rapid return type liquid-electric composite injection device is required to adjust the pressure,

[0062] Through remote control of the ground control cabinet, the trigger command is transmitted to the first controller through the cable, the first motor is started to drive the high-pressure pump, the pressurized hydraulic oil is ejected, the first piston is directly pushed down, the connecting rod, the compression sleeve and the throttle sleeve are driven down, the disc spring is compressed, and the flow rate tested by the downhole pressure flow monitoring component is compared with the flow rate required for injection. When it is within the error, the current position is maintained;

[0063] When further adjustment is required, start the second motor, pull the sealing body out of the inner sealing sleeve, and the hydraulic oil passes through the first pressure relief hole, the second pressure relief hole, and the third pressure relief hole to the injection channel. At the same time, under the action of the disc spring, the connecting rod, the pressure sleeve, and the throttle sleeve move up quickly, and the first piston returns to the initial position quickly to complete the track change. If the required flow rate cannot be achieved, the track is changed again until the required opening is adjusted, that is, the required flow rate is achieved.

[0064] A1. When a cable-controlled high-thrust intelligent packer is required to be set,

[0065] Through remote control of the ground control cabinet, the trigger command is transmitted to the second controller of the cable-controlled high-thrust intelligent packer through the cable, and the third motor is controlled to drive the plunger pump to extract the hydraulic oil from the oil outlet joint, through the second pipeline and the hydraulic oil input end to the plunger pump. The plunger pump pumps the pressurized hydraulic oil through the hydraulic oil output end and the setting pipeline to the setting joint, and then acts on the force step of the starting piston through the setting channel until the starting shear pin is cut off, the starting piston moves upward, and the setting rubber cylinder is compressed to complete the setting of the packer;

[0066] A2. When the cable-controlled high-thrust intelligent packer is needed to release the seal,

[0067] Through remote control of the ground control cabinet, the trigger command is transmitted to the second controller of the cable-controlled high-thrust intelligent packer through the cable, the second motor is controlled to work, the plunger is driven to move through the rotating assembly, the pressure relief channel is opened, and the high-pressure hydraulic oil passes through the sealing channel, the sealing joint, the pressure relief pipeline, the pressure relief input hole, the pressure relief output counterbore, the first pipeline, and finally returns to the back pressure joint. The sealing rubber cylinder returns to its position with its own elastic force, completing the unsealing of the packer;

[0068] Furthermore, it is assumed that there are N fast-returning liquid-electric composite injection devices;

[0069] After setting the pipe string, according to the geological injection plan, combined with the ground flow meter and the downhole pressure flow monitoring component display of the fast return type hydraulic and electric composite injection device, the track is changed by pressure through the ground control cabinet;

[0070] Adjust the Nth fast-return type hydraulic-electric composite polymer injection device to the required injection volume, referring to the surface flow meter and the Nth downhole pressure flow monitoring component data of the Nth fast-return type hydraulic-electric composite polymer injection device;

[0071] Then adjust the N-1st fast-return type hydraulic-electric composite polymer injection device to the required injection volume, also referring to the surface flow meter and the N-1st downhole pressure flow monitoring component data of the N-1st fast-return type hydraulic-electric composite polymer injection device;

[0072] ……;

[0073] Finally, the injection volume of the first fast-return hydraulic-electric composite polymer injection device is adjusted, also referring to the surface flow meter and the first downhole pressure flow monitoring component data of the first fast-return hydraulic-electric composite polymer injection device.

[0074] Compared with the prior art, the present invention has the following beneficial effects:

[0075] 1. The intelligent layered polymer injection string adopts a fast-return hydraulic-electric composite polymer injection device and a cable-controlled high-thrust intelligent packer, which realizes the intelligent control of the downhole polymer injection device and the packer, and improves the digital level of the polymer injection process;

[0076] 2. The quick-return hydraulic-electric composite polymer injection device adopts the design of downhole hydraulic pressure direct discharge + disc spring large thrust return mechanism and multi-stage track changing mechanism, which greatly shortens the adjustment time of the downhole hydraulic-electric composite polymer injection device;

[0077] 3. The fast-return hydraulic-electric composite injection device and the cable-controlled high-thrust intelligent packer adopt the downhole oil chamber and downhole motor pressure-injection method, which abandons the downhole long-distance hydraulic oil transmission method and shortens the pressure-injection adjustment time of the downhole hydraulic-electric composite injection device;

[0078] 4. Use one cable to control the multi-layer liquid-electric composite injection device in real time, which reduces the number of wellbore pipelines and improves the level of intelligence;

[0079] 5. A spindle throttling unit with a special shape is designed to reduce the viscosity loss of polymer injection. At the same time, a special coating treatment is set to reduce the degree of polymer adsorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 It is a structural schematic diagram of a layered polymer injection string with integrated measurement and control according to the present invention;

[0081] Figure 2 It is a structural schematic diagram of a fast-returning liquid-electric composite polymer injection device for a layered polymer injection column with integrated measurement and control according to the present invention;

[0082] Figure 3 It is a structural schematic diagram of a cable-controlled high-thrust intelligent packer with integrated measurement and control of a layered polymer injection string according to the present invention;

[0083] Figure 4 yes Figure 2 Sectional view at AA in the middle;

[0084] Figure 5 It is a track schematic diagram of a track sleeve of a layered polymer injection string with integrated measurement and control according to the present invention;

[0085] Figure 6 It is a top view and a partial cross-sectional view of a middle pressure transmission joint of a layered polymer injection string with integrated measurement and control according to the present invention;

[0086] In the figure: 1. Guide wire plug; 2. Quick return type hydraulic and electric composite injection device; 3. Cable-controlled large-thrust intelligent packer; 4. Cable; 5. Oil pipe; 6. Ground control cabinet; 7. Wellhead; 8. Flow meter;

[0087] 201, upper joint; 202, power tube; 203, first rubber ring; 204, outer sealing sleeve; 205, first controller; 206, oil chamber; 207, first motor; 208, second motor; 209, inner sealing sleeve; 210, sealing body; 211, high-pressure pump; 212, pressure hole; 213, first pressure relief hole; 214, first piston; 215, upper connector; 216, connecting rod; 217, middle connector; 218, track sleeve; 219, track nail; 220, lower connector; 221, disc spring; 222, pressing sleeve; 223, vulcanized sealing body; 224, throttling sleeve; 225, injection sleeve; 226, first lower joint; 227, downhole pressure and flow monitoring assembly; 228, first through hole; 229, injection channel; 230, second through hole;

[0088] 301, second upper joint; 302, upper center tube; 303, second rubber ring; 304, upper sealing head; 305, floating piston; 306, upper sealing sleeve; 307, upper pressure-transmitting joint; 308, oil outlet joint; 309, balance hole; 310, oil return joint; 311, middle center tube; 312, middle sealing head; 313, circuit skeleton; 314, second controller; 315, middle sealing sleeve; 316, second cable joint; 317, third motor; 318, plunger pump; 319, fourth motor; 320, rotating assembly; 321, plunger; 322, third rubber ring; 323 , middle pressure transmission joint; 324, sealing pipeline; 325, pressure relief pipeline; 326, tee; 327, sealing joint; 328, connector; 329, sealing channel; 330, lower pressure transmission joint; 331, lower center pipe; 332, adjusting ring; 333, sealing rubber cylinder; 334, spacer ring; 335, support sleeve; 336, starting piston; 337, starting shear pin; 338, fixing ring; 339, second lower joint; 340, hydraulic oil input end; 341, hydraulic oil output end; 342, injection channel; 343, pressure relief input hole; 344, pressure relief output counterbore; 345, pressure relief channel. DETAILED DESCRIPTION

[0089] 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.

[0090] See also Figures 1 to 3The present invention provides a measurement and control integrated stratified polymer injection string, comprising a fast-return hydraulic-electric composite polymer injection device 2, a cable-controlled large-thrust intelligent packer 3, a cable 4, and an oil pipe 5. The lower end of the oil pipe 5 is provided with a guide wire plug 1, and at least two fast-return hydraulic-electric composite polymer injection devices 2 are provided on the oil pipe 5. A cable-controlled large-thrust intelligent packer 3 is provided between every two fast-return hydraulic-electric composite polymer injection devices 2, and each fast-return hydraulic-electric composite polymer injection device 2 corresponds to an oil layer; a ground control cabinet 6 is also provided on the ground, and the cable 4 is provided with a guide wire plug 1. The branch line is connected to the joint of each fast-return type hydraulic-electric composite polymer injection device 2 and the cable-controlled large-thrust intelligent packer 3, the bus of the cable 4 is connected to the ground control cabinet 6, the oil pipe 5 is connected to the wellhead 7 at the top, and the input end of the wellhead 7 is provided with a flow meter 8; by remotely controlling the ground control cabinet 6, the fast-return type hydraulic-electric composite polymer injection device 2 and the cable-controlled large-thrust intelligent packer 3 can be controlled in real time, and the polymer injection device and the packer simultaneously adopt a hydraulic-electric integrated structural design, realizing the purpose of underground large thrust regulation and fast power transmission.

[0091] Among them, the ground control cabinet 6 has the function of controlling the fast-return hydraulic-electric composite injection device 2 and the cable-controlled high-thrust intelligent packer 3. It can remotely command the injection device to pressurize and release the pressure to achieve track change adjustment, and can also pressurize and release the pressure of the packer to achieve the sealing and unsealing of the packer.

[0092] Embodiment 1:

[0093] See also Figure 2 , Figure 4 , Figure 5 , wherein a fast return type liquid-electric composite polymer injection device 2 comprises a power mechanism, a transmission mechanism, and a graded polymer injection mechanism connected in sequence from top to bottom;

[0094] The power mechanism includes a power tube 202, an outer sealing sleeve 204, and an inner sealing sleeve 209;

[0095] The power tube 202 is a stepped tube with a thin top and a thick bottom. The lower end of the outer sealing sleeve 204 is threadedly connected to the upper end of the thick part of the power tube 202. The inner sealing sleeve 209 is arranged in the annulus between the power tube 202 and the outer sealing sleeve 204, and the lower end is in contact with the upper end surface of the thick part of the power tube 202. The inner sealing sleeve 209 is provided with two axial through holes, which are divided into a first through hole 228 and a second through hole 230. The first through hole 228 is provided with a high-pressure pump 211, and the second through hole 230 is provided with a sealing body 210. The annular space between the power tube 202 and the outer sealing sleeve 204 is provided with a first motor 207 and an oil chamber 206 above the high-pressure pump 211. The upper end wall of the thick portion of the power tube 202 is provided with a pressure hole 212 in the area corresponding to the first through hole 228. The first motor 207 drives the high-pressure pump 211 to pressurize the hydraulic oil in the oil chamber 206 and spray it out from the pressure hole 212. The annular space between the power tube 202 and the outer sealing sleeve 204 is provided with a second motor 208 and a first controller 205 above the sealing body 210.

[0096] The inner sealing sleeve 209 is provided with an annular groove at the lower end to connect the first through hole 228 with the lower end of the second through hole 230, so that the bottom of the sealing body 210 becomes the first pressure relief hole 213, and the inner wall of the inner sealing sleeve 209 is provided with a second pressure relief hole to connect the second through hole 230 with the inner wall of the inner sealing sleeve 209, and the detailed tube wall of the power tube 202 is provided with a third pressure relief hole in the area corresponding to the second pressure relief hole, and the second motor 208 can pull the inner sealing sleeve 209 upward, and when the inner sealing sleeve 209 does not block the second pressure relief hole, the first pressure relief hole 213 and the second pressure relief hole are connected to start rapid pressure relief; the upper end of the outer sealing sleeve 204 is provided with a refueling connector above the oil chamber 206, and a first cable connector is provided above the first controller 205.

[0097] The transmission mechanism includes an upper connector 215, a middle connector 217, a lower connector 220, a first piston 214, a connecting rod 216, and a pressing sleeve 222;

[0098] The inner wall of the lower end of the thick part of the power tube 202 is connected to the outer wall of the upper end of the upper connector 215. The upper connector 215 is provided with an axial through hole that coincides with the punching hole 212. The first piston 214 is placed inside the axial through hole of the upper connector 215; the inner wall of the upper end of the middle connector 217 is connected to the outer wall of the lower end of the upper connector 215. The connecting rod 216 is arranged in the middle connector 217, and its upper end is movably connected to the lower end of the first piston 214. The lower connector 220 is threadedly connected to the middle connector 217. The inner wall of the upper end of the lower connector 220 is provided with a step, and the track sleeve 218 is arranged on the step. On the top, the middle connector 217 is connected with the lower connector 220 to press the track sleeve 218, the track sleeve 218 is provided with a track nail 219, the outer wall of the connecting rod 216 is provided with a track, and the track cooperates with the track nail 219; the upper outer wall of the pressing sleeve 222 is connected to the lower inner wall of the connecting rod 216, the lower connector 220 is provided with a disc spring seat below the connecting rod 216, a disc spring 221 is provided between the disc spring seat and the lower end face of the connecting rod 216, the disc spring 221 is sleeved on the outer wall of the pressing sleeve 222, and a vulcanized sealing body 223 is provided between the inner wall of the lower connector 220 and the outer wall of the pressing sleeve 222.

[0099] The outer wall track of the connecting rod 216 is a multi-level track with at least two "Y" shapes;

[0100] The graded polymer injection mechanism includes a throttling sleeve 224 and a polymer injection sleeve 225;

[0101] The upper end of the throttling sleeve 224 is connected to the lower end of the pressing sleeve 222, the upper end of the injection sleeve 225 is connected to the lower end of the lower connector 220, the inner wall of the injection sleeve 225 is provided with an injection hole, the outside of the throttling sleeve 224 is provided with at least two external throttling units, the inside of the injection sleeve 225 is provided with at least two internal throttling units below the injection hole, the internal throttling units and the external throttling units are both spindle-shaped, and the surfaces of the internal throttling units and the external throttling units are coated with polytetrafluoroethylene; the injection resistance is adjusted by adjusting the overlap between the throttling sleeve 224 and the injection sleeve 225, thereby adjusting the injection flow rate.

[0102] The upper end of the power tube 202 is connected to a first upper joint 201 , and the lower end of the injection sleeve 225 is connected to a first lower joint 226 .

[0103] The power tube 202 is sealed with the upper and lower ends of the outer sealing sleeve 204, the inner and outer surfaces of the inner sealing sleeve 209 are sealed with the outer sealing sleeve 204 and the power tube 202, the power tube 202 and the upper connector 215, the middle connector 217 and the upper connector 215, the injection sleeve 225 and the lower connector 220, and the first lower joint 226 and the injection sleeve 225, all through rubber rings 203.

[0104] At the same time, all the polymer inflow channels are rounded;

[0105] The cable 4 is connected to the first controller 205 through a first cable connector. The first controller 205 is a PLC programmable controller, which can directly control the first motor 207 and the second motor 208. The first motor 207 is connected to the high-pressure pump 211, which can output a hydraulic control pressure of 20-30MPa. The output pressure end is connected to the pressure hole 212 and the first pressure relief hole 213 through the first through hole 228 and the ring groove at the lower end of the inner sealing sleeve. The second motor 208 is connected to the sealing body 210 and can drive the sealing body 210 to move axially. At the same time, a downhole pressure flow monitoring component 227 is also placed inside the sealed space formed by the outer sealing sleeve 204, the power tube 202 and the inner sealing sleeve 209, and is controlled by the first controller 205.

[0106] It should be noted that the PLC programmable controller, high-pressure pump 211, and downhole pressure flow monitoring component 227 are all existing technologies, and their usage and arrangement methods are clear to those skilled in the art, so they will not be elaborated.

[0107] Embodiment 2:

[0108] See also Figure 3 , Figure 6 , wherein a cable-controlled high-thrust intelligent packer 3 includes a downhole oil supply mechanism, a pressure-boosting and pressure-relieving mechanism, and a hydraulic setting mechanism;

[0109] The downhole oil supply mechanism includes an upper central pipe 302, an upper sealing head 304, a movable piston 305, an upper sealing sleeve 306, and an upper pressure-transmitting joint 307;

[0110] The upper sealing head 304 is arranged on the inner wall of the upper end of the upper sealing sleeve 306, the upper pressure-uploading joint 307 is arranged on the inner wall of the lower end of the upper sealing sleeve 306, the floating piston 305 is arranged in the upper sealing sleeve 306, the floating piston 305 is between the upper sealing head 304 and the upper pressure-uploading joint 307, the upper center tube 302 passes through the upper sealing head 304 and the floating piston 305, and the lower end is connected to the inner wall of the upper pressure-uploading joint 307, the tube wall of the upper center tube 302 is provided with a balancing hole 309, and the balancing hole 309 is between the upper sealing head 304 and the floating piston 305, the upper pressure-uploading joint 307 is provided with an axially through oil outlet hole and an oil return hole, the lower end of the oil outlet hole is provided with an oil outlet joint 308, and the lower end of the oil return hole is provided with an oil return joint 310.

[0111] The pressure boosting and pressure relief mechanism includes an intermediate central tube 311, an intermediate sealing head 312, an intermediate sealing sleeve 315, and an intermediate pressure transmission joint 323;

[0112] The upper end of the intermediate central tube 311 is connected to the inner wall of the pressure transmitting joint 307, the intermediate sealing head 312 is sleeved on the intermediate central tube 311, the intermediate sealing head 312 is provided with a second cable joint 316, the inner wall of the intermediate pressure transmitting joint 323 is connected to the lower end of the intermediate central tube 311, the upper end of the intermediate sealing sleeve 315 is connected to the outer wall of the intermediate sealing head 312, and the lower end is connected to the intermediate pressure transmitting joint 323;

[0113] The intermediate sealing sleeve 315 is provided with a circuit skeleton 313, a third motor 317, a plunger pump 318, a fourth motor 319, and a rotating assembly 320 between the intermediate sealing head 312 and the intermediate pressure transmission joint 323. The circuit skeleton 313 is provided on the intermediate central tube 311. The circuit skeleton 313 is provided with a second controller 314. The center of the intermediate pressure transmission joint 323 is an injection channel 342.

[0114] The middle pressure transmission joint 323 is provided with an axially through plunger counterbore hole and an adapter hole, a plunger 321 is provided in the plunger counterbore, the rotating assembly 320 is connected to the plunger 321, the fourth motor 319 drives the rotating assembly 320, the plunger pump 318 is connected to the adapter hole to expose the hydraulic oil input end 340 and the hydraulic oil output end 341, the third motor 317 drives the plunger pump 318, a third rubber ring 322 is provided between the plunger 321 and the plunger counterbore, a pressure relief input hole 343 is provided on the bottom surface of the plunger counterbore to connect the plunger counterbore with the outside, a pressure relief output counterbore 344 is provided on the bottom surface of the middle pressure transmission joint 323, the pressure relief output counterbore 344 is connected to the plunger counterbore through the pressure relief channel 345, the pressure relief output counterbore 344 is connected to the return oil joint 310 through the first pipeline, and the hydraulic oil input end 340 is connected to the oil outlet joint 308 through the second pipeline.

[0115] The hydraulic setting mechanism includes a tee 326, a connector 328, a lower pressure transmission connector 330, a lower center pipe 331, a support sleeve 335, and a fixing ring 338;

[0116] The upper end of the connector 328 is connected to the inner wall of the middle pressure-transmitting connector 323, the lower end of the connector 328 is connected to the inner wall of the lower pressure-transmitting connector 330, the upper end of the lower center tube 331 is connected to the inner wall of the lower pressure-transmitting connector 330, the support sleeve 335 is sleeved on the outer wall of the lower center tube 331, the lower end of the lower pressure-transmitting connector 330 is provided with a concave ring, the support sleeve 335 is connected to the concave ring of the lower pressure-transmitting connector 330, the upper end of the inner wall of the fixing ring 338 is connected to the lower end of the lower center tube 331, and the outer sleeve of the support sleeve 335 is provided with an adjusting ring 332 , a setting rubber cylinder 333, a starting piston 336, the upper end of the adjusting ring 332 is connected to the lower end of the lower pressure transmission joint 330, the lower end of the starting piston 336 is connected to the fixing ring 338 through the starting shear pin 337, the upper end of the fixing ring 338 is provided with an extension tube, the outer wall of the extension tube is in contact with the starting piston, the inner wall of the starting piston 336 is provided with a force step, at least two setting rubber cylinders 333 are provided between the adjusting ring 332 and the starting piston 336, and a spacer ring 334 is provided between every two setting rubber cylinders 333;

[0117] The lower pressure transmission joint 330 is provided with a sealing joint 327, and a sealing channel 329 is provided under the sealing joint 327, and the sealing channel 329 is connected to the annulus formed by the starting piston 336 and the lower center pipe 331; the sealing joint 327 is connected to the tee 326, and the tee 326 includes a collecting pipeline, a pressure relief pipeline 325, and a sealing pipeline 324; the collecting pipeline is connected to the sealing joint 327, the pressure relief pipeline 325 is connected to the pressure relief input hole 343, and the sealing pipeline 324 is connected to the hydraulic oil output end 341 of the plunger pump 318.

[0118] By pressurizing the annulus formed by the starting piston 336 and the lower center pipe 331, the starting piston 336 cuts off the starting shear pins 337 and moves up along the extension pipe to seal.

[0119] The upper end of the upper central tube 302 is provided with a second upper joint 301 , and the lower end of the fixing ring 338 is provided with a second lower joint 339 .

[0120] The second rubber ring 303 is used to seal the upper center tube 302 and the upper sealing head 304, the upper sealing head 304 and the upper sealing sleeve 306, the movable piston 305 and the upper sealing sleeve 306 and the upper center tube 302, the pressure transmission joint 307 and the upper sealing sleeve 306 and the upper center tube 302, the intermediate sealing head 312 and the intermediate center tube 311 and the intermediate sealing sleeve 315, the intermediate pressure transmission joint 323 and the intermediate sealing sleeve 315, the lower pressure transmission joint 330 and the supporting sleeve 335, the supporting sleeve 335 and the starting piston 336, and the starting piston 336 and the fixing ring 338.

[0121] The second controller 314 is a PLC programmable controller, and the cable 4 is connected to the second controller 314 via a second cable connector 314 .

[0122] Embodiment 3:

[0123] In combination with Examples 1 and 2, during construction, the specific method of using the present invention is:

[0124] S1. According to Figure 1 As shown, the space between the movable piston 305 and the upper pressure-transmitting joint 307 is filled with hydraulic oil, and the pipe string is lowered to the required position, so that one fast-returning hydraulic-electric composite injection device 2 corresponds to one oil layer, and finally the cable 4 is connected to the ground control cabinet 6;

[0125] S2, setting the pipe string;

[0126] S3. When the rapid return type liquid-electric composite injection device is required to adjust the pressure,

[0127] Through remote control of the ground control cabinet, the trigger command is used to control the first controller 205 through the cable 4, the first motor 207 is started to drive the high-pressure pump 211, and the pressurized hydraulic oil directly pushes the first piston 214 downward, drives the connecting rod 216, the pressing sleeve 222 and the throttle sleeve 224 downward, compresses the disc spring 221, and compares the flow rate tested by the downhole pressure flow monitoring component 227 with the flow rate required for injection. When it is within the error, the current position is maintained;

[0128] When further adjustment is required, a trigger command is sent through cable 4 to control the first controller 205, start the second motor 208, pull the sealing body 210 out of the inner sealing sleeve 209, and the hydraulic oil passes through the first pressure relief hole 213, the second pressure relief hole, and the third pressure relief hole of the power tube 202 to the injection channel 229, thereby realizing the rapid direct discharge of the hydraulic oil underground. At the same time, under the action of the disc spring 221, the connecting rod 216, the pressing sleeve 222, the vulcanized sealing body 223 and the throttling sleeve 224 can be quickly moved upward, and the first piston 214 can be quickly returned to its initial position, completing this track change and adjusting the relative axial position of the throttling sleeve 224 and the injection sleeve 225. If the required flow rate cannot be achieved, the track is changed again until it is adjusted to the required opening, that is, the required flow rate is achieved.

[0129] The specific flow regulation method is: according to the geological injection plan, combined with the ground flow meter and the display of the downhole pressure flow monitoring component 227 of the quick-return type hydraulic-electric composite injection device 2, the ground control cabinet 6 is used to pressurize the change track to adjust the lowermost quick-return type hydraulic-electric composite injection device 2 to the required injection volume, and then adjust the middle quick-return type hydraulic-electric composite injection device 2 to the required injection volume (also refer to the ground flow meter 8 and the display of the downhole pressure flow monitoring component 227 of the quick-return type hydraulic-electric composite injection device 2), and finally adjust the injection volume of the uppermost quick-return type hydraulic-electric composite injection device 2 (also refer to the ground flow meter 8 and the display of the downhole pressure flow monitoring component 227 of the quick-return type hydraulic-electric composite injection device 2).

[0130] A1. When the cable-controlled high-thrust intelligent packer 3 is required to be set,

[0131] Through remote control of the ground control cabinet 6, the trigger command is transmitted to the second controller 314 of the cable-controlled high-thrust intelligent packer 3 through the cable 4, the third motor 317 is started to drive the plunger pump 318 to work, and the hydraulic oil is extracted from the oil outlet joint 308, through the second pipeline and the hydraulic oil input end 340 to the plunger pump 18, and the plunger pump 18 transfers the pressurized hydraulic oil through the hydraulic oil output end 341 and the sealing pipeline 324 to the sealing joint 327, and through the sealing channel 329, acts on the force step of the starting piston 336 until the starting shear pin 337 is cut off, the starting piston 336 moves upward, compresses the sealing rubber cylinder 333, and completes the sealing of the packer;

[0132] A2. When the cable-controlled high-thrust intelligent packer is needed to release the seal,

[0133] By remotely controlling the ground control cabinet 6, the trigger command is transmitted to the second controller 314 of the cable-controlled large-thrust intelligent packer 3 through the cable 4, the second motor 319 is started, and the plunger 321 is driven to move through the rotating component 320 to open the pressure relief channel 343. The high-pressure hydraulic oil passes through the sealing channel 329, the sealing joint 327, the pressure relief pipeline 325, the pressure relief input hole 343, the pressure relief output counterbore 344, and the first pipeline, and finally returns to the back pressure joint 310. The sealing rubber cylinder 333 returns to its position by its own elastic force, and the packer is unsealed;

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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 measurement and control integrated layered polymer injection string, comprising a tubing, a packer, a ground control cabinet, and a cable, characterized in that: It also includes a fast-return type liquid-electric composite injection device; At least two fast-return hydraulic-electric composite polymer injection devices are arranged on the oil pipe, and a packer is arranged between every two fast-return hydraulic-electric composite polymer injection devices; each fast-return hydraulic-electric composite polymer injection device corresponds to an oil layer; The rapid return type hydraulic-electric composite polymer injection device comprises a power mechanism, a transmission mechanism, and a graded polymer injection mechanism which are sequentially connected from top to bottom, and the ground control cabinet controls the power mechanism through cables.

2. The layered polymer injection string with integrated measurement and control according to claim 1, characterized in that: The power mechanism comprises a power tube, an outer sealing sleeve, and an inner sealing sleeve; The power tube is a stepped tube with a thin top and a thick bottom. The lower end of the outer sealing sleeve is threadedly connected to the upper end of the thick part of the power tube. The inner sealing sleeve is arranged in the annulus between the power tube and the outer sealing sleeve, and the lower end is in contact with the upper end surface of the thick part of the power tube. The inner sealing sleeve is provided with two axial through holes, which are divided into a first through hole and a second through hole. A high-pressure pump is provided in the first through hole, and a sealing body is provided in the second through hole. The annular space between the power tube and the outer sealing sleeve is provided with a first motor and an oil chamber above the high-pressure pump, and a pressure hole is provided on the upper end wall of the thick portion of the power tube in the area corresponding to the first through hole, and the first motor can drive the high-pressure pump to pressurize the hydraulic oil in the oil chamber and spray it out from the pressure hole; The annular space between the power tube and the outer sealing sleeve is provided with a second motor and a first controller above the sealing body; The inner sealing sleeve is provided with an annular groove at the lower end thereof to connect the first through hole with the lower end of the second through hole, so that the lower part of the sealing body becomes a first pressure relief hole, the inner wall of the inner sealing sleeve is provided with a second pressure relief hole to connect the second through hole with the inner wall of the inner sealing sleeve, the detailed wall of the power tube is provided with a third pressure relief hole in the area corresponding to the second pressure relief hole, and the second motor can pull the inner sealing sleeve upward; The upper end of the outer sealing sleeve is provided with a refueling connector above the oil cavity, and a first cable connector is provided above the first controller.

3. The layered polymer injection string with integrated measurement and control according to claim 2, characterized in that: The transmission mechanism comprises an upper connector, a middle connector, a lower connector, a first piston, a connecting rod, and a pressing sleeve; The inner wall of the lower end of the thick part of the power tube is connected to the outer wall of the upper end of the upper connector, the upper connector is provided with an axial through hole that coincides with the punching hole, and the first piston is placed inside the axial through hole of the upper connector; The inner wall of the upper end of the middle connector is connected to the outer wall of the lower end of the upper connector, the connecting rod is arranged in the middle connector, and the upper end of the connecting rod is movably connected to the lower end of the first piston, the lower connector is threadedly connected to the middle connector, the inner wall of the upper end of the lower connector is provided with a step, the track sleeve is arranged on the step, and the middle connector is connected to the lower connector to press the track sleeve; The track sleeve is provided with track nails, the outer wall of the connecting rod is provided with tracks, and the tracks cooperate with the track nails; The outer wall of the upper end of the pressing sleeve is connected to the inner wall of the lower end of the connecting rod, the lower connecting body is provided with a disc spring seat below the connecting rod, a disc spring is provided between the disc spring seat and the lower end surface of the connecting rod, and the disc spring is sleeved on the outer wall of the pressing sleeve; The connecting rod outer wall track is a multi-level track provided with at least two "Y" shapes.

4. The layered polymer injection string with integrated measurement and control according to claim 3, characterized in that: The graded polymer injection mechanism comprises a throttling sleeve and a polymer injection sleeve; The upper end of the throttling sleeve is connected to the lower end of the pressing sleeve, the upper end of the injection sleeve is connected to the lower end of the lower connector, the inner wall of the injection sleeve is provided with an injection hole, and the outside of the throttling sleeve is provided with at least two external throttling units; At least two internal throttling units are arranged inside the polymer injection sleeve below the polymer injection hole; The inner throttling unit and the outer throttling unit are both spindle-shaped, and the surfaces of the inner throttling unit and the outer throttling unit are coated with polytetrafluoroethylene.

5. The layered polymer injection string with integrated measurement and control according to claim 4, characterized in that: The upper end of the power tube is connected to a first upper joint, and the lower end of the injection sleeve is connected to a first lower joint; The power tube is sealed with rubber rings between the upper and lower ends of the outer sealing sleeve, between the inner and outer surfaces of the inner sealing sleeve and the outer sealing sleeve and the power tube, between the power tube and the upper connector, between the middle connector and the upper connector, between the injection sleeve and the lower connector, and between the first lower joint and the injection sleeve; A vulcanized sealing body is provided between the inner wall of the lower connector and the outer wall of the compression sleeve; A downhole pressure and flow monitoring component is also placed inside the sealed space formed by the outer sealing sleeve, the power tube and the inner sealing sleeve, and is controlled by the first controller.

6. The measurement and control integrated layered polymer injection string according to claim 2, characterized in that: The packer is a cable-controlled high-thrust intelligent packer; The cable-controlled high-thrust intelligent packer comprises a downhole oil supply mechanism, a pressure-boosting and pressure-relieving mechanism, and a hydraulic setting mechanism which are sequentially connected from top to bottom.

7. The measurement and control integrated layered polymer injection string according to claim 6, characterized in that: The downhole oil supply mechanism comprises an upper central pipe, an upper sealing head, a movable piston, an upper sealing sleeve, and an upper pressure-transmitting joint; The upper sealing head is arranged on the inner wall of the upper end of the upper sealing sleeve, the upper pressure-uploading joint is arranged on the inner wall of the lower end of the upper sealing sleeve, the floating piston is arranged in the upper sealing sleeve, the floating piston is between the upper sealing head and the upper pressure-uploading joint, the upper center tube passes through the upper sealing head and the floating piston, and the lower end is connected to the inner wall of the upper pressure-uploading joint; The upper central tube wall is provided with a balancing hole, and the balancing hole is between the upper sealing head and the floating piston; The upper pressure-transmitting joint is provided with an axially through oil outlet hole and an oil return hole, an oil outlet joint is provided at the lower end of the oil outlet hole, and an oil return joint is provided at the lower end of the oil return hole.

8. The layered polymer injection string with integrated measurement and control according to claim 7, characterized in that: The pressure boosting and pressure relief mechanism comprises an intermediate central tube, an intermediate sealing head, an intermediate sealing sleeve, and an intermediate pressure transmission joint; The upper end of the intermediate central tube is connected to the inner wall of the pressure transfer joint, the intermediate sealing head is sleeved on the intermediate central tube, the intermediate sealing head is provided with a second cable joint, the inner wall of the intermediate pressure transfer joint is connected to the lower end of the intermediate central tube, the upper end of the intermediate sealing sleeve is connected to the outer wall of the intermediate sealing head and the lower end is connected to the intermediate pressure transfer joint; The intermediate sealing sleeve is provided with a circuit skeleton, a third motor, a plunger pump, a fourth motor, and a rotating assembly between the intermediate sealing head and the intermediate pressure transmission joint. The circuit skeleton is provided on the intermediate central tube, and a second controller is provided on the circuit skeleton. The middle pressure transmission joint is provided with an axially through plunger counterbore hole and an adapter hole, a plunger is provided in the plunger counterbore, the rotating assembly is connected to the plunger, the fourth motor drives the rotating assembly, the plunger pump is connected to the adapter hole to expose the hydraulic oil input end and the hydraulic oil output end, the third motor drives the plunger pump, a third rubber ring is provided between the plunger and the plunger counterbore, a pressure relief input hole is provided on the bottom surface of the plunger counterbore to connect the plunger counterbore with the outside, a pressure relief output counterbore is provided on the bottom surface of the middle pressure transmission joint, and the pressure relief output counterbore is connected with the plunger counterbore through a pressure relief channel; The pressure relief output counterbore is connected to the oil return joint through a first pipeline, and the hydraulic oil input end is connected to the oil outlet joint through a second pipeline.

9. The layered polymer injection string with integrated measurement and control according to claim 8, characterized in that: The hydraulic setting mechanism includes a connector, a lower pressure transmission connector, a lower center pipe, a support sleeve, and a fixing ring; The upper end of the connector is connected to the inner wall of the middle pressure-transmitting joint, the lower end of the connector is connected to the inner wall of the lower pressure-transmitting joint, the upper end of the lower center tube is connected to the inner wall of the lower pressure-transmitting joint, the support sleeve is sleeved on the outer wall of the lower center tube, a concave ring is provided at the lower end of the lower pressure-transmitting joint, the support sleeve is connected to the concave ring of the lower pressure-transmitting joint, and the upper end of the inner wall of the fixing ring is connected to the lower end of the lower center tube; The support sleeve is covered with an adjusting ring, a sealing rubber cylinder and a starting piston; The upper end of the adjusting ring is connected to the lower end of the lower pressure transmission joint, the lower end of the starting piston is connected to the fixing ring through the starting shear pins, the upper end of the fixing ring is provided with an extension tube, the outer wall of the extension tube is in contact with the starting piston, the inner wall of the starting piston is provided with a force step, at least two setting rubber cylinders are provided between the adjusting ring and the starting piston, and a spacer ring is provided between every two setting rubber cylinders; The lower pressure transmission joint is provided with a sealing joint, a sealing passage is provided under the sealing joint, and the sealing passage is communicated with the annulus formed by the starting piston and the lower center pipe.

10. The layered polymer injection string with integrated measurement and control according to claim 9, characterized in that: It also includes a tee, which includes a collection pipeline, a pressure relief pipeline, and a sealing pipeline; The collecting pipeline is connected to the sealing joint, the pressure relief pipeline is connected to the pressure relief input hole, and the sealing pipeline is connected to the hydraulic oil output end of the plunger pump.

11. The layered polymer injection string with integrated measurement and control according to claim 10, characterized in that: The upper end of the upper central tube is provided with a second upper joint, and the lower end of the fixing ring is provided with a second lower joint; The second rubber ring is used to seal the upper center tube and the upper sealing head, the upper sealing head and the upper sealing sleeve, the movable piston and the upper sealing sleeve and the upper center tube, the pressure transmission joint and the upper sealing sleeve and the upper center tube, the middle sealing head and the middle center tube and the middle sealing sleeve, the middle pressure transmission joint and the middle sealing sleeve, the lower pressure transmission joint and the supporting sleeve, the supporting sleeve and the starting piston, and the starting piston and the fixing ring.

12. The layered polymer injection string with integrated measurement and control according to claim 11, characterized in that: A guide wire plug is provided at the bottom of the oil pipe. The first controller is a first PLC programmable controller; the second controller is a second PLC programmable controller; The branch line of the cable is connected to the first cable connector of each fast-return type hydraulic-electric composite injection device and the second cable connector of the cable-controlled large-thrust intelligent packer, and the bus of the cable is connected to the ground control cabinet; The uppermost end of the oil pipe is connected to the wellhead, and a flow meter is provided at the wellhead input end.

13. A method for using a layered polymer injection column with integrated measurement and control, characterized in that: The following steps are included: S1. Fill the space between the floating piston and the pressure-uploading joint with hydraulic oil, lower the pipe string to the required position, make one fast-return hydraulic-electric composite injection device correspond to one oil layer, and finally connect the cable to the ground control cabinet; S2, setting the pipe string; S3. When the rapid return type liquid-electric composite injection device is required to adjust the pressure, Through remote control of the ground control cabinet, the trigger command is transmitted to the first controller through the cable, the first motor is started to drive the high-pressure pump, the pressurized hydraulic oil is ejected, the first piston is directly pushed down, the connecting rod, the compression sleeve and the throttle sleeve are driven down, the disc spring is compressed, and the flow rate tested by the downhole pressure flow monitoring component is compared with the flow rate required for injection. When it is within the error, the current position is maintained; When further adjustment is required, start the second motor, pull the sealing body out of the inner sealing sleeve, and the hydraulic oil passes through the first pressure relief hole, the second pressure relief hole, and the third pressure relief hole to the injection channel. At the same time, under the action of the disc spring, the connecting rod, the pressure sleeve, and the throttle sleeve move up quickly, and the first piston returns to the initial position quickly to complete the track change. If the required flow rate cannot be achieved, the track is changed again until the required opening is adjusted, that is, the required flow rate is achieved.

14. The method for using the integrated measurement and control layered polymer injection string according to claim 13, characterized in that: A1. When a cable-controlled high-thrust intelligent packer is required to be set, Through remote control of the ground control cabinet, the trigger command is transmitted to the second controller of the cable-controlled high-thrust intelligent packer through the cable, and the third motor is controlled to drive the plunger pump to extract the hydraulic oil from the oil outlet joint, through the second pipeline and the hydraulic oil input end to the plunger pump. The plunger pump pumps the pressurized hydraulic oil through the hydraulic oil output end and the setting pipeline to the setting joint, and then acts on the force step of the starting piston through the setting channel until the starting shear pin is cut off, the starting piston moves upward, and the setting rubber cylinder is compressed to complete the setting of the packer; A2. When the cable-controlled high-thrust intelligent packer is needed to release the seal, Through remote control of the ground control cabinet, the trigger command is transmitted to the second controller of the cable-controlled high-thrust intelligent packer through the cable, the second motor is controlled to work, the plunger is driven to move through the rotating assembly, the pressure relief channel is opened, and the high-pressure hydraulic oil passes through the sealing channel, the sealing joint, the pressure relief pipeline, the pressure relief input hole, the pressure relief output counterbore, the first pipeline, and finally returns to the back-pressure joint. The sealing rubber cylinder returns to its position with the help of its own elastic force, completing the unsealing of the packer.

15. The method for using the integrated measurement and control layered polymer injection string according to claim 13, characterized in that: Assume that there are N fast-returning liquid-electric composite injection devices; After setting the pipe string, according to the geological injection plan, combined with the ground flow meter and the downhole pressure flow monitoring component display of the fast return type hydraulic and electric composite injection device, the track is changed by pressure through the ground control cabinet; Adjust the Nth fast-return type hydraulic-electric composite polymer injection device to the required injection volume, referring to the surface flow meter and the Nth downhole pressure flow monitoring component data of the Nth fast-return type hydraulic-electric composite polymer injection device; Then adjust the N-1st fast-return type hydraulic-electric composite polymer injection device to the required injection volume, also referring to the surface flow meter and the N-1st downhole pressure flow monitoring component data of the N-1st fast-return type hydraulic-electric composite polymer injection device; ……； Finally, the injection volume of the first fast-return hydraulic-electric composite polymer injection device is adjusted, also referring to the surface flow meter and the first downhole pressure flow monitoring component data of the first fast-return hydraulic-electric composite polymer injection device.

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