An electro-hydraulic integrated layered polymer injection device, pipe string and use method

Abstract

This invention discloses an electro-hydraulic integrated layered polymer injection device, tubing, and method of use. The polymer injection device includes a polymer injection switch and a flow regulation and control device connected together. The flow regulation and control device includes an electrical control mechanism and a main body. The main body has a vertical channel and a horizontal channel. The vertical channel includes a main channel, an electrical control mechanism mounting cavity, a hydraulic pressure-pressurizing channel, and a cable passage channel. The horizontal channel includes an inner pressure-pressurizing channel. The electrical control mechanism is installed in the electrical control mechanism mounting cavity and is electrically connected to the cable. The electrical control mechanism mounting cavity is connected to the hydraulic pressure-pressurizing channel through the inner pressure-pressurizing channel. This invention features rapid response and precise adjustment, greatly simplifies the number of wellbore lines and improves the reliability of the adjustment drive, thereby increasing the success rate of construction.

Description

Technical Field

[0001] This invention relates to the field of single-tube layered polymer injection technology, specifically to an electro-hydraulic integrated layered polymer injection device, tubing, and method of use. Background Technology

[0002] To improve polymer injection efficiency, enhance displacement effects, and reduce inter-layer interference, polymer injection wells need to be subdivided for injection. Currently, the main stratified polymer injection technologies include concentric dual-tube stratified polymer injection and hollow single-tube stratified polymer injection. Concentric dual-tube stratified polymer injection strings use two independent injection channels, basically meeting the field requirements for stratified polymer injection. However, because concentric dual-tube strings can only inject up to two layers, and the initial investment cost is relatively high, large-scale promotion in various oilfields is limited. With continuous technological development, the hollow single-tube stratified polymer injection technology has been continuously improved in recent years, resulting in pre-installed cable direct-control electrically controlled stratified polymer injection strings and concentric adjustable single-tube stratified polymer injection strings, etc. The former achieves real-time monitoring of pre- and post-injection pressures without the need for instrument tripping during testing, direct surface reading of flow rate, direct control, and no-trace testing. Although it achieves no-trace testing, the lifespan of electronic components is difficult to guarantee. Furthermore, the adjustment using the polymer injector's internal downhole motor has low self-adjustment torque, making it difficult to adjust in the later stages of polymer injection. The latter injection volume adjustment mechanism has a spiral lifting and lowering injection core to adjust the injection volume of the polymer pressure reduction and adhesion retention mechanism; the polymer pressure reduction and adhesion retention mechanism has a shuttle-shaped wave injection channel with pressure reduction and adhesion retention characteristics; the injection core has sufficient inner diameter to ensure the operation of profile testing and other operations. However, relying solely on the lowering and adjusting instrument for testing and adjustment, especially in the later stage of polymer injection, when a lot of polymer adheres to the wellbore, it is very easy to cause the instrument to not be lowered into place or to be unable to be adjusted, resulting in a low success rate of testing and adjustment.

[0003] Chinese Patent 201710028171.9 discloses a large-capacity single-tube layered polymer injection adjustable device, including a testing and adjustment tool introduction mechanism, an injection volume adjustment mechanism, and a polymer pressure reduction and adhesion retention mechanism. The testing and adjustment tool introduction mechanism has a guiding and positioning function; the injection volume adjustment mechanism has a spirally lifting and lowering injection core to adjust the injection volume of the polymer pressure reduction and adhesion retention mechanism; the polymer pressure reduction and adhesion retention mechanism has a spindle-shaped wave injection channel with pressure reduction and adhesion retention characteristics; the injection core has a sufficient inner diameter to ensure the conduct of profile testing and other operations, and the layered polymer injection testing and adjustment working cylinder has a bridge-type channel, so that when testing is carried out in the current layer, it does not affect the polymer injection of other layers. It has the characteristics of large injection volume, good adhesion retention, and adjustable injection volume, realizing multi-segment injection of single-tube layered polymer injection testing and adjustment, solving the current difficulties faced by layered polymer injection in offshore oilfields, and effectively improving polymer utilization and oil displacement effect. However, this process requires the lowering of instruments, especially in the later stage of polymer injection, due to the inner wall structure of the tubing or polymer adhesion, it is difficult to lower the testing and adjustment instruments, ultimately leading to testing and adjustment failure.

[0004] Chinese Patent 202010328374.1 discloses a pre-installed cable direct-control electrically controlled layered polymer injection process string and method. It relates to the field of layered polymer injection well technology, and particularly to a pre-installed cable direct-control electrically controlled layered polymer injection process string and method. The string includes a casing containing tubing. The annulus between the casing and tubing is divided into different layers by several cable-passing washable packers. A single-core steel cable passes through these cable-passing washable packers. A flow-direct reading downhole electrically controlled polymer injector is installed between adjacent packers. The injection volume of the flow-direct reading downhole electrically controlled polymer injector is controlled by a surface controller. The flow-direct reading downhole electrically controlled polymer injector contains two pressure sensors and an electromagnetic flowmeter. The provided polymer injection process string and method allow the surface control device to power and communicate with the downhole flow-direct reading electrically controlled polymer injector via a single-core steel cable. This enables interactive monitoring between the surface and the well, achieving real-time monitoring of flow rate, pre- and post-injection pressure without the need for instrument tripping during testing. While this process eliminates the need for drop-and-retrieve testing, the built-in motor torque is relatively low, making it difficult to achieve prolonged downhole adjustments.

[0005] How to control single-tube multi-layered polymer injection has become a challenge for polymer injection developers. Therefore, it is necessary to conduct research on single-tube multi-layered polymer injection design to improve the effective utilization of this type of reservoir. Summary of the Invention

[0006] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide an electro-hydraulic integrated layered polymer injection device, tubing, and method of use. This hydraulic multi-stage adjustment device achieves multi-stage polymer injection adjustment through a single cable and a hydraulic control line. The hydraulic control line provides hydraulic driving force, while the cable enables the operation of the electric pressure pump and the monitoring of testing devices (including pressure and flow rate). It features rapid response and precise adjustment, greatly simplifies the number of wellbore lines and the reliability of adjustment drive, and improves the success rate of construction.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An electro-hydraulic integrated layered polymer injection device includes a polymer injection switch and a flow regulation and control device connected to each other.

[0009] The flow regulation and control device includes an electronic control mechanism and a main body;

[0010] The main body has vertical and horizontal channels. The vertical channel includes a main channel, an electrical control mechanism mounting cavity, a hydraulic pressure channel, and a cable passage channel. The horizontal channel includes an inner pressure channel.

[0011] The electrical control mechanism is installed inside the electrical control mechanism mounting cavity, and the electrical control mechanism is electrically connected to the cable. The electrical control mechanism mounting cavity is connected to the hydraulic pressure channel through the pressure inner channel.

[0012] Furthermore, the upper end of the main channel of the main body is connected to the upper connector through the upper connecting pipe, and the lower end of the main channel is connected to the middle connector through the lower connecting pipe. The lower end of the middle connector is connected to the upper end of the middle connector of the injection switch.

[0013] Furthermore, the electrical control mechanism includes a PLC main board, a testing device, and a motor. The PLC main board is located at the top and is electrically connected to a cable. The testing device and the motor are both electrically connected to the PLC main board, and the motor is located at the bottom.

[0014] Furthermore, the upper port of the hydraulic pressure channel of the main body is connected to a hydraulic pipeline, and the lower port of the hydraulic pressure channel of the main body is connected to the piston chamber where the piston of the polymer injection switch is located through a pressure pipeline.

[0015] Furthermore, sealing material is placed at the location of the motor to prevent the power fluid from flowing up to the test device and PLC mainboard placed above.

[0016] Furthermore, the injection switch includes a piston mechanism and a water nozzle mechanism connected to each other.

[0017] Furthermore, the piston mechanism includes a piston, a central assembly, a retaining ring, a sealing assembly, an upper outer sleeve, an upper spring, and a connecting rod;

[0018] The upper outer sleeve is fitted outside the middle body, and the upper outer sleeve and the middle body form a piston chamber. The upper half of the piston extends into the piston chamber. The retaining ring and sealing assembly are also set in the piston chamber. The sealing assembly is located above the piston. The retaining ring is located above the sealing assembly. The middle body has a pressure transmission channel. The upper end of the pressure transmission channel is connected to the pressure-pressurizing pipeline of the flow regulation and control device, and the lower end of the pressure transmission channel is connected to the piston chamber.

[0019] The connecting rod is located inside the upper jacket. The upper end of the connecting rod is connected to the piston, and the lower end of the connecting rod is connected to the movable water nozzle of the water nozzle mechanism. The upper spring is fitted outside the connecting rod. The upper end of the upper spring abuts against the lower end of the piston, and the lower end of the upper spring abuts against the limiting shoulder of the outer wall of the connecting rod.

[0020] Furthermore, the sealing assembly includes an upper copper ring, an upper polytetrafluoroethylene layer, an adhesive ring, a lower polytetrafluoroethylene layer, and a lower copper ring stacked together from top to bottom, wherein at least one upper or lower polytetrafluoroethylene layer is provided.

[0021] Furthermore, the water tap mechanism includes an inner outer sleeve, a movable water tap, a lower spring, a valve, a support sleeve, a lower outer sleeve, a lower connector, and a sealing gasket;

[0022] The lower outer sleeve is fitted over the movable water nozzle. The upper end of the lower outer sleeve is connected to the upper outer sleeve of the piston mechanism through the middle outer sleeve. The lower end of the lower outer sleeve is connected to the lower connector. The upper end of the movable water nozzle is connected to the connecting rod of the piston mechanism. The lower half of the movable water nozzle is a multi-stage bellows structure. The inner wall of the lower connector is also provided with a multi-stage bellows structure corresponding to the lower half of the movable water nozzle. The inner wall of the lower connector is also provided with a diameter reduction step. The sealing gasket is placed on the diameter reduction step facing the lower end face of the movable water nozzle above.

[0023] The lower outer sleeve and the movable water nozzle form a valve cavity. The lower spring, valve, and support sleeve are arranged sequentially from top to bottom in the valve cavity. The lower outer sleeve has an injection hole that can connect to the valve cavity.

[0024] To achieve the above objectives, the present invention adopts the following technical solution:

[0025] An electro-hydraulic integrated layered polymer injection string includes a downhole hydraulic packer, tubing, a layered packer, and a surface control cabinet. The tubing is connected to the downhole hydraulic packer and the electro-hydraulic integrated layered polymer injection device. Each oil layer is equipped with one electro-hydraulic integrated layered polymer injection device. The downhole hydraulic packer is placed at the upper boundary of the uppermost oil layer. The electro-hydraulic integrated layered polymer injection device includes a polymer injection switch and a flow regulation control device connected to it.

[0026] The flow regulation and control device includes an electronic control mechanism and a main body;

[0027] The main body has vertical and horizontal channels. The vertical channel includes a main channel, an electrical control mechanism mounting cavity, a hydraulic pressure channel, and a cable passage channel. The horizontal channel includes an inner pressure channel.

[0028] The electrical control mechanism is installed inside the electrical control mechanism mounting cavity, and the electrical control mechanism is electrically connected to the cable. The electrical control mechanism mounting cavity is connected to the hydraulic pressure channel through the pressure inner channel.

[0029] Furthermore, the upper end of the main channel of the main body is connected to the upper connector via an upper connecting pipe, and the lower end of the main channel is connected to the middle connector via a lower connecting pipe. The lower end of the middle connector is connected to the upper end of the middle assembly of the polymer injection switch. The electrical control mechanism includes a PLC main board, a testing device, and a motor. The PLC main board is located at the top and is electrically connected to the cable. The testing device and the motor are both electrically connected to the PLC main board. The motor is located at the bottom. The upper port of the hydraulic pressure channel of the main body is connected to the hydraulic control pipeline, and the lower port of the hydraulic pressure channel of the main body is connected to the piston chamber where the piston of the polymer injection switch is located via the pressure pipeline. Sealing material is placed at the location of the motor to prevent the power fluid from flowing upwards to the upper-placed testing device and PLC main board.

[0030] To achieve the above objectives, the present invention adopts the following technical solution:

[0031] A method for using an electro-hydraulic integrated stratified polymer injection device includes the following steps: During routine injection, a command is sent to the electro-hydraulic integrated stratified polymer injection device via armored cable through a surface display and control cabinet. When the downhole electro-hydraulic integrated stratified polymer injection device receives the command, it starts the motor. The power fluid is transmitted through the pressure fitting and pressure line to the piston chamber, pushing the piston downward, compressing the spring, and driving the connecting rod and movable nozzle downward. The flow rate is adjusted by adjusting the gap between the movable nozzle and the lower fitting. When the preset flow rate is reached, the motor automatically stops, completing the adjustment of this layer. The polymer flows from the tubing through the gap of the movable nozzle at the bottom of the electro-hydraulic integrated stratified polymer injection device, pushing the valve and compressing the lower spring, so that the polymer flows out from the injection port to the formation. The motor stops working, and the nozzle stops moving.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. By using a combination of downhole motor micro-drive and hydraulically controlled high-power drive, the accuracy of polymer injection switch adjustment is improved;

[0034] 2. By using two pipelines in the oil layer and one pipeline above the oil layer, independent control and regulation of multiple layers downhole can be achieved, simplifying the number of wellbore pipelines and improving construction efficiency.

[0035] 3. The water tap adopts a multi-stage corrugated pipe design, which improves the polymer viscosity retention rate and flow resistance;

[0036] 4. An anti-backflow mechanism is installed to reduce the risk of polymer clogging the faucet. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the electro-hydraulic integrated layered polymer injection column structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the upper structure of the electro-hydraulic integrated layered polymerization device of the present invention;

[0039] Figure 3 This is a schematic diagram of the lower structure of the electro-hydraulic integrated layered polymerization device of the present invention;

[0040] Figure 4 This is a top view of the electro-hydraulic integrated layered polymerization device of the present invention from direction AA;

[0041] Figure 5 This is a cross-sectional view along line BB of the electro-hydraulic integrated layered polymerization device of the present invention;

[0042] Figure 6 This is a magnified view of part C of the electro-hydraulic integrated layered polymer injection device.

[0043] In the diagram: 1. Plug, 2. Electro-hydraulic integrated layered polymer injection device, 3. Hydraulic control pipeline, 4. Armored cable, 5. Layered packer, 6. Hydraulic control tee, 7. Cable tee, 8. Downhole hydraulic packer, 9. Tubing, 10. Surface control cabinet;

[0044] 201 Upper connector, 202 Rubber ring, 203 Upper connecting pipe, 204 Body, 205 PLC main board, 206 Testing device, 207 Motor, 208 Pressure testing connector, 209 Pressure testing pipeline, 210 Lower connecting pipe, 211 Middle connector, 212 Middle assembly, 213 Retaining ring, 214 Sealing assembly, 215 Upper outer sleeve, 216 Piston, 217 Adjusting shim, 218 Upper spring, 219 Connecting rod, 220 Middle outer sleeve, 221 Movable water nozzle, 222 Lower spring, 223 Valve, 224 Support sleeve, 225 Lower outer sleeve, 226 Lower connector, 227 Sealing gasket, 228 Pressure cap;

[0045] 2041 Main channel, 2042 Main circuit connector, 2043 Hydraulic pressure testing connector, 2044 Cable passage channel;

[0046] 2045 Pressurize the inner channel; 2046 Plug. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Example 1:

[0049] Please see Figure 1 An electro-hydraulic integrated layered polymer injection string includes a plug 1, an electro-hydraulic integrated layered polymer injection device 2, a hydraulic control line 3, an armored cable 4, a layered packer 5, a hydraulic control tee 6, a cable tee 7, a downhole hydraulic packer 8, tubing 9, and a surface control cabinet 10. The plug is placed at the bottom of the string. The layered packer is used to seal oil layers. Each oil layer corresponds to one electro-hydraulic integrated layered polymer injection device. The downhole hydraulic packer is placed at the upper boundary of oil layer 1. The plug, the electro-hydraulic integrated layered polymer injection device, and the layered packer are connected to the wellhead through the tubing. The hydraulic control line and the armored cable are connected to the lower electro-hydraulic integrated layered polymer injection device, and then connected to the upper electro-hydraulic integrated layered polymer injection device through the hydraulic control tee and the cable tee, respectively. Finally, the hydraulic control line is connected to the downhole hydraulic packer, and the armored cable is led out to the surface display and control cabinet.

[0050] The layered packer is equipped with a pipeline crossing channel;

[0051] The lower end of the downhole hydraulic unit is equipped with a hydraulic control pipeline joint.

[0052] Example 2:

[0053] Please see Figures 2 to 6 The electro-hydraulic integrated layered polymerization device includes an upper connector 201, a rubber ring 202, an upper connecting pipe 203, a main body 204, a PLC main board 205, a testing device 206, a motor 207, a pressure testing connector 208, a pressure testing pipeline 209, a lower connecting pipe 210, a middle connector 211, a middle connecting body 212, a retaining ring 213, a sealing assembly 214, an upper outer sleeve 215, a sealing piston 216, an adjusting shim 217, an upper spring 218, a connecting rod 219, a middle outer sleeve 220, and a movable water nozzle 221. The components include a lower spring 222, a valve 223, a support sleeve 224, a lower outer sleeve 225, a lower connector 226, and a sealing gasket 227. The upper connector and the upper connecting rod are fixed together by a pressure cap 228, which is threaded to the upper connector. The upper and lower connecting pipes are threaded to the body. The body has multiple axial channels, namely a main channel 2041, an electrical control mechanism channel 2047, a hydraulic pressure channel 2048, and a cable passage channel 2044. The PLC main board, testing device, and motor are also included. The electrical control mechanism channel 2047, which is the electrical control mechanism mounting cavity, is located inside the main body. The pressure connector 208 and pressure line 209 are connected to the motor output end. The lower connecting pipe is threaded to the lower end of the main body. The middle connector is threaded to the lower connecting pipe. The middle connector is threaded to the middle connecting body 212. The retaining ring 213 fixes the sealing component 214 inside the piston 216. The connecting rod 219 is threaded to the piston. The connecting rod is threaded to the movable water nozzle 221. The water nozzle adopts a multi-stage corrugated pipe form, which improves the polymer viscosity retention rate and flow resistance. The connecting rod and the upper outer sleeve 215 are annularly arranged with the spring 218 and the adjusting shim 217. The upper outer sleeve and the middle outer sleeve 220 are threaded to each other. The middle outer sleeve and the lower outer sleeve 225 are threaded to each other. The lower connector 226 is threaded to the lower outer sleeve. The lower spring 222, the valve 223, and the support sleeve 224 are placed in the annular space between the movable water nozzle and the lower outer sleeve.

[0054] The rubber rings are provided between the upper connector and the pressure cap, between the lower connecting rod and the middle connector, between the middle connecting body and the upper outer sleeve, between the connecting rod and the piston, between the upper outer sleeve and the middle outer sleeve, and between the middle outer sleeve and the lower outer sleeve.

[0055] The sealing gasket 227 is provided between the movable water nozzle and the lower connector;

[0056] The sealing assembly includes a copper ring 2141, a polytetrafluoroethylene (graphite) layer 2142, and a high-hardness rubber ring 2143;

[0057] The upper part of the main body includes a main channel 2041, a main circuit connector 2042, a hydraulic pressure connector 2043, and a cable passage channel 2044, with each channel arranged axially parallel.

[0058] The body section is provided with a pressure inner channel 2045 and a plug 2046. The pressure inner channel connects the motor and the corresponding electrical control mechanism channel 2047 of the hydraulic pressure connector. Each channel is vertically aligned. The hydraulic oil pumped by the motor needs to be input from channel 2043, and finally the hydraulic oil is pressurized to the input end of the lower device.

[0059] The main connector of the circuit is connected to the PLC main board 205, and the PLC main board is also connected to the control and testing device 206 and the motor 207.

[0060] The testing device includes, but is not limited to, temperature sensors and flow sensors;

[0061] The motor can transmit the power fluid in the downhole hydraulic pack to the piston chamber at the lower end through the pressure connector and pressure pipeline. At the same time, sealing material is placed in the motor part to prevent the power fluid from flowing up to the PLC main board and testing device at the upper end.

[0062] The connecting rod has a step at its outer end, and a sealing assembly is provided between the connecting rod and the movable water nozzle; the diameter of the sealing surface between the connecting rod and the movable water nozzle is larger than the diameter of the sealing surface between the central body and the piston.

[0063] The lower outer sleeve is provided with multiple injection ports, and the outer end of the valve is provided with two sealing rings to seal the injection ports when the injection is stopped.

[0064] An anti-backflow mechanism is incorporated to reduce the risk of polymer clogging the nozzle. The anti-backflow mechanism includes a lower spring 222, a valve 223, and a support sleeve 224. When injection stops, the valve moves downward under the action of the spring, blocking the injection port. When injection occurs, the valve moves upward under pressure, compressing the spring and opening the injection port to allow polymer injection.

[0065] Example 3:

[0066] like Figures 1 to 6During routine injection, commands are sent to the electro-hydraulic integrated stratified polymer injection device via armored cables through the ground display and control cabinet. When the downhole electro-hydraulic integrated stratified polymer injection device receives the command, it starts the motor. The power fluid is transmitted to the piston chamber through the pressure joint and pressure pipeline, pushing the piston down, compressing the spring, and driving the connecting rod and movable nozzle down. The flow rate is adjusted by adjusting the gap between the movable nozzle and the lower joint. When the preset flow rate is reached, the motor automatically stops, completing the adjustment of the layer. The polymer flows from the tubing through the gap of the movable nozzle at the bottom of the electro-hydraulic integrated stratified polymer injection device, pushing the valve, compressing the lower spring, and realizing the polymer flowing out from the injection port to the formation. The motor stops working, and the nozzle stops moving.

[0067] Taking three-layer polymer injection as an example, the specific flow rate adjustment method is as follows: based on the geological injection plan, the test data from the downhole flow sensor is transmitted to the PLC mainboard. After judgment and analysis, the motor is controlled to drive the movable water nozzle to adjust the flow rate of that layer. Then, commands are sent to adjust the flow rate of other layers to a suitable level until all layers are adjusted. The electrical control mechanism of the flow rate adjustment control device is itself a conventional technology in this field and will not be described in detail.

[0068] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field and will not be elaborated upon further. Examples include welding and threaded connections.

[0069] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0071] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electro-hydraulic integrated layered polymer injection device, comprising a polymer injection switch and a flow regulation and control device connected to each other; characterized in that The flow regulation and control device includes an electronic control mechanism and a main body; The main body has vertical and horizontal channels. The vertical channel includes a main channel, an electrical control mechanism mounting cavity, a hydraulic pressure channel, and a cable passage channel. The horizontal channel includes an inner pressure channel. The electrical control mechanism is installed in the electrical control mechanism mounting cavity and is electrically connected to the cable. The electrical control mechanism mounting cavity is connected to the hydraulic pressure channel through the pressure inner channel. The upper end of the main channel of the main body is connected to the upper connector through the upper connecting pipe, and the lower end of the main channel is connected to the middle connector through the lower connecting pipe. The lower end of the middle connector is connected to the upper end of the middle connector of the injection switch. The electrical control mechanism includes a PLC main board, a testing device, and a motor. The PLC main board is located at the top and is electrically connected to the cable. The testing device and the motor are both electrically connected to the PLC main board. The motor is located at the bottom. The upper port of the hydraulic pressure channel of the main body is connected to the hydraulic pipeline, and the lower port of the hydraulic pressure channel of the main body is connected to the piston chamber where the piston of the injection switch is located through the pressure pipeline. The polymer injection switch includes a piston mechanism and a water nozzle mechanism connected together; The piston mechanism includes a piston, a central assembly, a retaining ring, a sealing assembly, an upper outer sleeve, an upper spring, and a connecting rod; The upper outer sleeve is fitted outside the middle body, and the upper outer sleeve and the middle body form a piston chamber. The upper half of the piston extends into the piston chamber. The retaining ring and sealing assembly are also set in the piston chamber. The sealing assembly is located above the piston. The retaining ring is located above the sealing assembly. The middle body has a pressure transmission channel. The upper end of the pressure transmission channel is connected to the pressure-pressurizing pipeline of the flow regulation and control device, and the lower end of the pressure transmission channel is connected to the piston chamber. The connecting rod is located inside the upper sleeve. The upper end of the connecting rod is connected to the piston, and the lower end of the connecting rod is connected to the movable water nozzle of the water nozzle mechanism. The upper spring is sleeved on the outside of the connecting rod. The upper end of the upper spring abuts against the lower end of the piston, and the lower end of the upper spring abuts against the limiting shoulder of the outer wall of the connecting rod. The water tap mechanism includes an inner jacket, a movable water tap, a lower spring, a valve, a support sleeve, an inner jacket, a lower connector, and a sealing gasket; The lower outer sleeve is fitted over the movable water nozzle. The upper end of the lower outer sleeve is connected to the upper outer sleeve of the piston mechanism through the middle outer sleeve. The lower end of the lower outer sleeve is connected to the lower connector. The upper end of the movable water nozzle is connected to the connecting rod of the piston mechanism. The lower half of the movable water nozzle is a multi-stage bellows structure. The inner wall of the lower connector is also provided with a multi-stage bellows structure corresponding to the lower half of the movable water nozzle. The inner wall of the lower connector is also provided with a diameter reduction step. The sealing gasket is placed on the diameter reduction step facing the lower end face of the movable water nozzle above. The lower outer sleeve and the movable water nozzle form a valve cavity. The lower spring, valve, and support sleeve are arranged in sequence from top to bottom in the valve cavity. The lower outer sleeve has an injection hole that can connect to the valve cavity. When the downhole electro-hydraulic integrated layered polymer injection device receives an instruction, it starts the motor. The power fluid is transmitted to the piston chamber through the pressure joint and pressure pipeline, pushing the piston down, compressing the spring, and driving the connecting rod and movable water nozzle down. By adjusting the gap between the movable water nozzle and the lower joint, the flow rate is adjusted. When the preset flow rate is reached, the motor automatically stops, and the adjustment is completed.

2. The electro-hydraulic integrated layered polymer injection device according to claim 1, characterized in that, Sealing material is placed at the location of the motor to prevent the power fluid from flowing up to the test device and PLC mainboard placed above.

3. The electro-hydraulic integrated layered polymer injection device according to claim 1, characterized in that, The sealing assembly includes, from top to bottom, an upper copper ring, an upper polytetrafluoroethylene layer, an adhesive ring, a lower polytetrafluoroethylene layer, and a lower copper ring stacked together, with at least one upper or lower polytetrafluoroethylene layer provided.

4. An electro-hydraulic integrated layered polymer injection tubing string, comprising a downhole hydraulic package, a tubing, a layered packer, a ground control cabinet, the tubing is connected with the downhole hydraulic package and the electro-hydraulic integrated layered polymer injection device, one electro-hydraulic integrated layered polymer injection device is arranged for each oil layer, and the downhole hydraulic package is placed at the upper boundary of the uppermost oil layer; characterized in that, The electro-hydraulic integrated layered polymerization device is the electro-hydraulic integrated layered polymerization device as described in claim 1.

5. The electro-hydraulic integrated layered polymer injection pipe string according to claim 4, characterized in that, The upper end of the main channel of the main body is connected to the upper connector via an upper connecting pipe, and the lower end of the main channel is connected to the middle connector via a lower connecting pipe. The lower end of the middle connector is connected to the upper end of the middle assembly of the polymer injection switch. The electrical control mechanism includes a PLC main board, a testing device, and a motor. The PLC main board is located at the top and is electrically connected to the cable. The testing device and the motor are both electrically connected to the PLC main board. The motor is located at the bottom. The upper port of the hydraulic pressure channel of the main body is connected to the hydraulic control pipeline, and the lower port of the hydraulic pressure channel of the main body is connected to the piston chamber where the piston of the polymer injection switch is located via the pressure pipeline. Sealing material is placed at the location of the motor to prevent the power fluid from flowing upwards to the upper-placed testing device and PLC main board.

6. A method for using an electro-hydraulic integrated layered polymer injection device, characterized in that, Using the electro-hydraulic integrated stratified polymer injection string as described in claim 4 includes the following steps: During routine injection, a command is sent to the electro-hydraulic integrated stratified polymer injection device via armored cable through a surface display and control cabinet. When the downhole electro-hydraulic integrated stratified polymer injection device receives the command, it starts the motor. The power fluid is transmitted to the piston chamber through the pressure joint and pressure pipeline, pushing the piston downward, compressing the spring, and driving the connecting rod and movable nozzle downward. The flow rate is adjusted by adjusting the gap between the movable nozzle and the lower joint. When the preset flow rate is reached, the motor automatically stops, completing the adjustment of this layer. The polymer flows from the tubing through the gap of the movable nozzle at the bottom of the electro-hydraulic integrated stratified polymer injection device, pushing the valve and compressing the lower spring, so that the polymer flows out from the injection port to the formation. The motor stops working, and the nozzle no longer moves.

Images