Electrically controlled hollow polymer injector and layered polymer injection string and method of use

Abstract

The application discloses an electrically-controlled hollow polymer injection device, a layered polymer injection pipe column and a use method. The electrically-controlled hollow polymer injection device comprises a sleeve, a hollow motor adjusting device and an adjustable polymer injection mechanism are arranged in the sleeve; the sleeve is provided with a polymer injection hole; the adjustable polymer injection mechanism comprises an adjusting core; an output shaft of the hollow motor adjusting device is connected with the adjusting core through a hollow reversing force-increasing transmission mechanism; and the flow-through diameter of the polymer injection hole is controlled by adjusting the position of the adjusting core. The application adopts an overall hollow structure design, meets the requirements of lowering a commonly-used testing tool, and meets the requirements of later testing; on the basis of keeping a large diameter, the overall tool has a small outer diameter, and the requirements of lowering the polymer injection well after sand prevention measures are realized. The hollow motor with large torque and the hollow reversing force-increasing transmission mechanism are adopted, large thrust adjustment is realized when the adjustment is difficult in the later polymer injection stage, and long-term adjustment of the polymer injection well is met.

Description

Technical Field

[0001] This invention relates to the field of downhole tool technology, specifically to an electrically controlled hollow polymerizer, a layered polymer injection string, and a method of using it. Background Technology

[0002] Polymer flooding is a crucial method for significantly improving oil recovery and increasing reserves and stabilizing production in oilfields. To enhance the efficiency of polymer injection wells, improve displacement effects, and reduce inter-layer interference, it is necessary to subdivide the injection process. Common polymer injectors include electrically controlled, hydraulically controlled, drop-and-retrieve, and adjustable types. Among them, electrically controlled polymer injectors offer advantages such as no need to trip instruments, direct flow reading from the ground, direct control, and real-time pressure monitoring. However, currently, electrically controlled polymer injectors mainly employ an eccentric structure, with the electrical control system running parallel to the flow channel; or the electrical control system is placed in the annulus between the central tube and the outer casing of the polymer injector. Both of these methods result in relatively low motor torque in current electrically controlled polymer injectors, leading to difficulty in adjustment during the later stages of polymer injection. Additionally, the small inner diameter makes it difficult to lower testing instruments, affecting subsequent testing operations.

[0003] Announcement No. CN102305056B discloses an eccentric electric dispensing device for polymer injection wells, including an electric drive assembly, a cable, a nut, a screw, and a valve core. A motor and a reducer are installed in a fifth longitudinal hole. The output end of the motor is connected to the input end of the reducer, and the output end of the reducer is connected to the screw. The nut is threadedly connected to the lower end of the screw. The valve core is located within a working chamber formed by the first and second longitudinal holes, with its upper end fixedly connected to the nut. The upper end of the adjusting body has a first radial hole along its radial direction, and the central tube has a second radial hole along its radial direction. The first and second radial holes communicate with each other. The lower end of the adjusting body has a radial outlet along its radial direction. The cable is installed in a cable mounting hole and is electrically connected to the motor.

[0004] Announcement No. CN111749663B discloses a layered polymer injection dispenser, an intelligent polymer injection system, and its application. The intelligent polymer injection system includes an intelligent polymer injection string and a ground control box. The intelligent polymer injection string includes tubing, several packers, and several layered polymer injection dispensers, which are alternately arranged on the tubing. Several packers and several layered polymer injection dispensers are connected to the ground control box via cables.

[0005] Announcement No. CN101936149B discloses an automatic circulation switch, a stratified water injection system, and an automatic circulation water injection method. The system includes two or more automatic circulation switches installed in the injection tubing corresponding to each oil layer. Each automatic circulation switch has a motor connected to a microprocessor for opening and closing the eccentric water distribution valve. The microprocessor on each automatic circulation switch is set with an opening and closing sequence. The automatic circulation switches automatically alternate opening and closing according to the set sequence to circulate water into each oil layer, achieving periodic pulse water injection into the downhole oil layer.

[0006] The injection structures of the three existing technologies mentioned above adopt an eccentric structure, with the electronic control adjustment device located on one side. The size of the motor is limited, resulting in a smaller torque. At the same time, the valve core and working chamber are small in size, which can easily cause polymer blockage.

[0007] Announcement No. CN108590608B discloses a downhole intelligent injector, including an injector housing, a flow meter, and an electric plugger. A central tube is located in the center of the injector. The electric plugger and its associated circuit module are installed within a closed space enclosed by the injector housing and the central tube. The downhole intelligent injector also includes a liquid flow generator, which is a screw generator. During injection, the flowing liquid drives the impeller inside the liquid flow generator to rotate, which in turn drives the gears on the generator to rotate, generating electricity. The electrical energy generated by the generator is stored in a battery, thus providing a stable power supply for the operation of the electric plugger and the flow meter.

[0008] Announcement No. CN114499040B discloses an integrated downhole power generation and flow measurement device for wireless stratified water injection, including a screw motor assembly, a magnetic coupling assembly, a generator assembly, and an electrical control circuit. The screw motor assembly and the generator assembly are connected through the magnetic coupling assembly to enable the screw motor assembly to drive the generator assembly to generate electricity. The electrical control circuit is connected to the generator assembly to obtain the stratified flow rate.

[0009] The two existing technologies mentioned above use downhole power generation, which is greatly affected by fluid flow. When the flow rate is low, the power generation is insufficient, affecting regulation.

[0010] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of the present invention. Regarding the 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 existing technology, the purpose of this invention is to provide an electrically controlled hollow polymerizer, a layered polymer injection column, and a method of use.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] On one hand, the present invention provides an electrically controlled hollow polymerizer, including an outer casing, inside which a hollow motor adjustment device and an adjustable polymer injection mechanism are disposed; the outer casing is provided with a polymer injection hole, and the adjustable polymer injection mechanism includes an adjustment core; the output shaft of the hollow motor adjustment device is connected to the adjustment core through a hollow reversing force-increasing transmission mechanism, and the flow diameter of the polymer injection hole is controlled by adjusting the position of the adjustment core.

[0014] Furthermore, the hollow motor adjustment device includes a hollow motor, which includes an outer stator and an internal hollow output shaft;

[0015] Specifically, the hollow reversing force-increasing transmission mechanism includes a hollow lead screw, a nut, and a push rod;

[0016] Specifically, the hollow lead screw is connected to the hollow output shaft, the inner wall of the nut is threadedly connected to the outer wall of the hollow lead screw, the push rod is connected to the nut, and the push rod is connected to the adjusting core.

[0017] Furthermore, the outer casing includes a motor casing and a polyurethane casing;

[0018] Specifically, the motor housing and the injection housing are connected by an upper connecting sleeve;

[0019] Specifically, a hollow motor adjustment device and a hollow reversing force-increasing transmission mechanism are provided inside the motor housing;

[0020] Specifically, the injection jacket is provided with injection holes, and an adjustable injection mechanism is provided inside the injection jacket.

[0021] Furthermore, the adjustable polymer injection mechanism includes an adjusting core, a valve core, and a lower connecting sleeve;

[0022] Specifically, the inner wall of the lower end of the injection sleeve is connected to the outer wall of the lower connecting sleeve;

[0023] Specifically, the adjusting core and the valve core are tubular, and the valve core is engaged in the annular space between the adjusting core and the injection sleeve;

[0024] Specifically, the outer wall of the regulating core is provided with an outer convex ring, the inner wall of the valve core is provided with an inner convex ring, the outer diameter of the outer convex ring is the same as the inner diameter of the inner convex ring, the annular space between the regulating core and the valve core is a flow passage, and the upper end of the valve core is provided with a flow hole corresponding to the injection hole;

[0025] Specifically, the inner wall of the lower connecting sleeve is provided with a sealing element. When the lower end of the adjusting core cooperates with the sealing element, the flow channel is sealed. The inner convex ring coincides with the corresponding outer convex ring. When the adjusting core leaves the sealing element, the space between the inner convex ring and the outer convex ring is the flow channel diameter.

[0026] Furthermore, the hollow motor adjustment device includes a hollow motor, a circuit board, and a circuit board support;

[0027] Specifically, the circuit board support includes a small-diameter tube and a large-diameter tube, which are connected by a transition step. The outer stator of the hollow motor is embedded in the large-diameter tube and sits on the transition step. The outer wall of the large-diameter tube mates with the inner wall of the motor jacket.

[0028] Specifically, a fixing ring is connected to the outer wall of the small-diameter pipe, the outer wall of the fixing ring is connected to the inner wall of the motor jacket, the circuit board is sleeved on the outer wall of the small-diameter pipe and located between the large-diameter pipe and the fixing ring, the circuit board is electrically connected to the hollow motor, and the fixing ring is provided with a cable sealing plug.

[0029] Furthermore, a positioning protrusion ring is provided on the outer wall of the upper connecting sleeve, the lower inner wall of the motor outer sleeve is connected to the upper outer wall of the upper connecting sleeve and positioned by the positioning protrusion ring, and the upper end of the inner wall of the injection sleeve is connected to the lower outer wall of the upper connecting sleeve and positioned by the positioning protrusion ring.

[0030] Specifically, the push rod is located in the annular space between the motor outer sleeve and the adjusting core. The inner wall of the upper end of the push rod is connected to the outer wall of the nut, and the inner wall of the lower end of the push rod is connected to the outer wall of the upper end of the adjusting core. The upper end face of the upper connecting sleeve can contact the lower end face of the push rod.

[0031] Furthermore, the lower end of the upper connecting sleeve is provided with a concave annular groove, the upper end of the valve core is inserted into the concave annular groove, the upper end of the lower connecting sleeve is provided with an extension tube, the valve core is engaged with the inner wall of the extension tube and the upper end face of the lower connecting sleeve, the upper end face of the extension tube is in contact with the upper connecting sleeve, and the extension tube is provided with an intermediate hole corresponding to the injection hole.

[0032] Furthermore, the outer convex ring and the inner convex ring are arc-shaped convex rings. At least two outer convex rings and inner convex rings are provided and are distributed at equal intervals. The distribution spacing of the outer convex rings and inner convex rings is equal. The number of outer convex rings and inner convex rings may be the same or different, and there is at least one corresponding set of outer convex rings and inner convex rings.

[0033] Secondly, the present invention provides an intelligent layered polymer injection string, including an intelligent polymer injection unit connected by an oil pipe, wherein at least two intelligent polymer injection units are provided; the intelligent polymer injection unit includes a packer, an electrically controlled hollow polymerizer, and an electronic flow meter arranged sequentially from top to bottom; each electrically controlled hollow polymerizer corresponds to an oil layer, and the lower end of the lowest intelligent polymer injection unit is connected to a plug.

[0034] Thirdly, the present invention provides a method for using an intelligent layered polymer injection column, comprising the following steps:

[0035] S1. Prepare intelligent polymer injection units with the same number of oil layers to be injected. Connect the cable to the electrically controlled hollow polymer distributor and the electronic flow meter. Run the intelligent polymer injection units into the well through the tubing.

[0036] S2. On the ground, transmit signals via cable to close all electrically controlled hollow polymerizers, open the lowest electrically controlled hollow polymerizer until the flow rate of the lower layer reaches the injection requirements, open the upper layer electrically controlled hollow polymerizer and adjust it so that the flow rate of the upper layer reaches the injection requirements, and adjust the electrically controlled hollow polymerizers sequentially from bottom to top until the control of all electrically controlled hollow polymerizers is completed.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. This invention adopts an integral hollow structure design with an inner diameter of 46mm, which meets the requirements for the insertion of commonly used testing tools and the requirements for subsequent testing. While maintaining a large diameter, the overall outer diameter of the tool is relatively small, which meets the requirements for insertion into polymer injection wells after sand control measures.

[0039] 2. This invention uses a high-torque hollow motor and a hollow reversing force-increasing transmission mechanism to achieve high thrust adjustment when adjustment is difficult in the later stage of polymer injection, thus meeting the long-term adjustment of polymer injection wells. The hollow motor's step adjustment, combined with a hollow lead screw and nut, converts the angle into distance, achieving precise flow rate control.

[0040] 3. This invention requires only one cable to complete multi-layer flow control, enabling the injection of polymer into wells after sand control measures. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of an electrically controlled hollow polymerizer according to the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of an intelligent layered polymer injection column in this invention.

[0043] In the diagram: 1 Upper connector, 2 Circuit board bracket, 3 Cable sealing plug, 4 Circuit board, 5 Hollow motor, 501 Stator, 502 Hollow output shaft, 6 Hollow lead screw, 7 Motor sleeve, 8 Nut, 9 Push rod, 10 Adjusting core, 11 Upper connecting sleeve, 12 Polymer injection sleeve, 1201 Polymer injection hole, 13 Valve core, 14 Lower connecting sleeve, 15 Seal, 16 Lower connector;

[0044] A-1 Packer, A-2 Electrically Controlled Hollow Coefficient, A-3 Cable, A-4 Electronic Flow Meter. Detailed Implementation

[0045] 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.

[0046] Example 1:

[0047] Please see Figure 1 The present invention provides an electrically controlled hollow polymerizer, comprising an outer casing, a hollow motor adjustment device and an adjustable polymer injection mechanism disposed within the outer casing, a polymer injection hole 1201 disposed within the outer casing, and an adjustable polymer injection mechanism comprising an adjustment core 10. The output shaft of the hollow motor adjustment device is connected to the adjustment core 10 via a hollow reversing force-increasing transmission mechanism, and the flow diameter of the polymer injection hole 1201 is controlled by adjusting the adjustment core 10.

[0048] Furthermore, the hollow motor adjustment device includes a hollow motor 5, which includes an outer stator 501 and an inner hollow output shaft 502. The hollow reversing and force-increasing transmission mechanism includes a hollow lead screw 6, a nut 8, and a push rod 9. The hollow lead screw 6 is fixedly connected to the hollow output shaft 502 by a key. The inner wall of the nut 8 is threadedly connected to the outer wall of the hollow lead screw 6. The push rod 9 is connected to the nut 8 and the adjusting core 10, and is positioned by a step. The rotational motion of the hollow output shaft 502 inside the hollow motor 5 is converted into linear motion through the cooperation of the hollow lead screw 6 and the nut 8.

[0049] Specifically, the displacement distance of the adjusting core 10 corresponding to one revolution of the hollow output shaft 502 is controlled by controlling the pitch of the hollow lead screw 6 and the nut 8.

[0050] Furthermore, the outer casing includes a motor outer casing 7 and a polymer injection outer casing 12. The motor outer casing 7 and the polymer injection outer casing 12 are connected by an upper connecting sleeve 11. The motor outer casing 7 is provided with a hollow motor adjustment device and a hollow reversing force-increasing transmission mechanism. The polymer injection outer casing 12 is provided with a polymer injection hole 1201 and an adjustable polymer injection mechanism is provided inside the polymer injection outer casing 12.

[0051] Specifically, the outer wall of the upper connecting sleeve 11 is provided with a positioning protrusion ring, the lower inner wall of the motor outer sleeve 7 is threadedly connected to the upper outer wall of the upper connecting sleeve 11 and positioned by the positioning protrusion ring, the upper end of the inner wall of the injection sleeve 12 is threadedly connected to the lower outer wall of the upper connecting sleeve 11 and sealed by a sealing ring and positioned by the positioning protrusion ring.

[0052] Specifically, the push rod 9 is located in the annular space between the motor outer sleeve 7 and the adjusting core 10. The inner wall of the upper end of the push rod 9 is threaded to the outer wall of the nut 8, and the inner wall of the lower end of the push rod 9 is threaded to the outer wall of the upper end of the adjusting core 10. The push rod 9 is positioned by a step and sealed by a sealing ring. The outer wall of the push rod 9 is sealed to the inner wall of the motor outer sleeve 7 by a sealing ring. The upper end face of the upper connecting sleeve 11 can contact the lower end face of the push rod 9 to limit the position of the push rod 9 and prevent the nut from coming out of the hollow lead screw 6.

[0053] Further, the adjustable polymer injection mechanism includes an adjusting core 10, a valve core 13, and a lower connecting sleeve 14. The inner wall of the lower end of the polymer injection outer sleeve 12 is threadedly connected to the outer wall of the lower connecting sleeve 14. The adjusting core 10 and the valve core 13 are tubular. The valve core 13 is engaged in an annular space between the adjusting core 10 and the polymer injection outer sleeve 12. The outer wall of the adjusting core 10 is provided with an outer convex ring, and the inner wall of the valve core 13 is provided with an inner convex ring. The outer diameter of the outer convex ring is the same as the inner diameter of the inner convex ring. The annular space between the adjusting core 10 and the valve core 13 is a flow channel. The upper end of the valve core 13 is provided with a flow hole corresponding to the polymer injection hole 1201. The inner wall of the lower connecting sleeve 14 is provided with a sealing element 15. When the lower end of the adjusting core 10 is engaged with the sealing element 15, the flow channel is sealed, and the inner convex ring coincides with the corresponding outer convex ring. When the adjusting core 10 leaves the sealing element 15, the space between the inner convex ring and the outer convex ring is the flow channel diameter.

[0054] Specifically, the lower inner wall of the upper connecting sleeve 11 is provided with a concave annular groove, the upper end of the valve core 13 is inserted into the concave annular groove, and the upper end of the lower connecting sleeve 14 is provided with an extension tube. The valve core 13 mates with the inner wall of the extension tube and the upper end face of the lower connecting sleeve 14, and the upper end face of the extension tube contacts the upper connecting sleeve 11. The extension tube has an intermediate hole corresponding to the injection hole 1201. The extension tube fills the annular space between the valve core 13 and the injection sleeve 12, improving the strength of the valve core 13. The valve core 13 is connected by a snap-fit ​​method, which can avoid the direct force of the tubing acting on the valve core 13, reduce the deformation of the valve core 13, and improve the injection accuracy.

[0055] Specifically, the outer and inner convex rings are arc-shaped convex rings, which reduces the shearing of the polymer.

[0056] Specifically, at least two outer convex rings and two inner convex rings are provided, and they are equidistantly distributed. The distribution spacing between the outer convex rings and the inner convex rings is equal. The number of outer convex rings and inner convex rings may be the same or different, and there is at least one corresponding pair of outer convex rings and inner convex rings. By adjusting the gap between multiple outer convex rings and inner convex rings by adjusting the displacement of the adjusting core 10, more precise adjustment of the injection volume can be achieved.

[0057] Specifically, the number of injection holes 1201, intermediate holes, and flow holes is the same, with at least two of each, and they are evenly distributed along the circumference of the injection jacket 12.

[0058] Specifically, the lower end of the lower connecting sleeve 14 is threadedly connected to the lower connector 16, and the lower connector 16 is connected to the oil pipe of the tubing string.

[0059] Specifically, the lower connecting sleeve 14, the injection sleeve 12, and the lower connector 16 are all sealed by sealing rings, and the sealing element 15 is a sealing ring.

[0060] Furthermore, the hollow motor adjustment device includes a hollow motor 5, a circuit board 4, and a circuit board support 2. The circuit board support 2 includes a small-diameter pipe and a large-diameter pipe, which are connected by a transition step. The outer stator 501 of the hollow motor 5 is embedded in the large-diameter pipe and sits on the transition step. The outer wall of the large-diameter pipe fits with the inner wall of the motor outer sleeve 7 and is sealed by a sealing ring. The outer wall of the small-diameter pipe is threadedly connected to a fixing ring, and the outer wall of the fixing ring is threadedly connected to the upper inner wall of the motor outer sleeve 7. The circuit board 4 is sleeved on the outer wall of the small-diameter pipe and located between the large-diameter pipe and the fixing ring. The circuit board 4 is electrically connected to the hollow motor 5. The fixing ring is provided with a cable sealing plug 3. The cable enters the loop between the small-diameter pipe and the motor outer sleeve 7 through the hole on the cable sealing plug 3. The cable is connected to the circuit board 4, and the upper end of the cable is connected to the ground control device.

[0061] Specifically, the annular space between the small-diameter pipe and the motor housing 7 is filled with sealant to ensure the safety of the circuit board 4.

[0062] Specifically, a stepper coil group is provided inside the external stator 501, and a stepper magnetic group is connected to the outer wall of the hollow output shaft 502. The stepper magnetic group is driven by the stepper coil group to make the hollow output shaft 502 rotate. The hollow motor 5 is a stepper motor, which can improve the control accuracy of the regulating core 10. The coil uses enameled wire to prevent leakage and corrosion.

[0063] Specifically, the upper end of the small-diameter tube of the circuit board bracket 2 is threaded to the connector 1 and sealed by a sealing ring.

[0064] Example 2:

[0065] like Figure 2 As shown, based on Embodiment 1, this embodiment provides an intelligent layered polymer injection string, including intelligent polymer injection units connected by oil pipes. At least two intelligent polymer injection units are provided. Each intelligent polymer injection unit includes a packer A-1, an electrically controlled hollow polymerizer A-2 as described in Embodiment 1, and an electronic flow meter A-4 arranged sequentially from top to bottom. Each electrically controlled hollow polymerizer A-2 corresponds to one oil layer, and the lower end of the lowest intelligent polymer injection unit is connected to a plug.

[0066] The packer A-1 is used for interlayer sealing. The packer A-1 is a cable packer. The electrically controlled hollow cohesive unit A-2 and the electronic flow meter A-4 are electrically connected to the surface control equipment via cable A3.

[0067] Example 3:

[0068] Based on Example 2, this example provides a method for using an intelligent layered polymer injection column, including the following steps:

[0069] S1. Prepare intelligent polymer injection units with the same number of oil layers to be injected. Connect the cable to the electrically controlled hollow polymer distributor A-2 and the electronic flow meter A-4. Lower the intelligent polymer injection units into the well through the tubing.

[0070] S2. On the ground, transmit signals via cable to close all electrically controlled hollow polymerizers A-2, open the lowest electrically controlled hollow polymerizer A-2 until the flow rate of the lower layer reaches the injection requirement, open the upper layer electrically controlled hollow polymerizer A-2 and adjust it so that the flow rate of the upper layer reaches the injection requirement. Adjust the electrically controlled hollow polymerizers A-2 sequentially from bottom to top until the control of all electrically controlled hollow polymerizers A-2 is completed.

[0071] The electronic flow meter A-4 transmits flow information to the ground in real time via cable, and flow data can also be measured by lowering a test instrument.

[0072] During the regulation of the electrically controlled hollow polymerizer A-2, the ground transmits signals to the circuit board 4 via a cable, driving the hollow output shaft 502 of the hollow motor 5 to rotate. This rotation is converted into linear motion by the hollow lead screw 6 and nut 8, pushing the push rod 9 and causing the regulating core 10 to move linearly. The outer protrusion on the outer wall of the regulating core 10 and the inner protrusion on the inner wall of the valve core 13 cooperate to regulate the flow rate. When the regulating core 10 moves to cooperate with the seal 15, the electrically controlled hollow polymerizer A-2 is in the closed state.

[0073] 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. They can be directly applied and will not be elaborated further.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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 electrically controlled hollow polymerizer comprising a jacket, characterized in that, The outer casing is equipped with a hollow motor adjustment device and an adjustable injection mechanism; The outer casing is provided with a polymer injection hole, and the adjustable polymer injection mechanism includes an adjustment core; The output shaft of the hollow motor adjustment device is connected to the adjustment core through a hollow reversing and force-increasing transmission mechanism. The flow diameter of the injection hole is controlled by adjusting the position of the adjustment core.

2. An electrically controlled hollow concentrator according to claim 1, characterized in that, The hollow motor adjustment device includes a hollow motor, which includes an outer stator and an inner hollow output shaft; The hollow reversing force-increasing transmission mechanism includes a hollow lead screw, a nut, and a push rod; The hollow lead screw is connected to the hollow output shaft, the inner wall of the nut is threaded to the outer wall of the hollow lead screw, the push rod is connected to the nut, and the push rod is connected to the adjusting core.

3. The electrically controlled hollow polymerizer according to claim 2, characterized in that, The outer casing includes a motor casing and a polyurethane casing; The motor jacket and the injection jacket are connected by an upper connecting sleeve; The motor housing is equipped with a hollow motor adjustment device and a hollow reversing and force-increasing transmission mechanism. The injection jacket is provided with injection holes, and an adjustable injection mechanism is provided inside the injection jacket.

4. The electrically controlled hollow polymerizer according to claim 3, characterized in that, The adjustable polymer injection mechanism includes an adjusting core, a valve core, and a lower connecting sleeve; The lower inner wall of the injection sleeve is connected to the outer wall of the lower connecting sleeve; The regulating core and the valve core are tubular, and the valve core is engaged in the annular space between the regulating core and the injection sleeve; The outer wall of the regulating core is provided with an outer convex ring, and the inner wall of the valve core is provided with an inner convex ring. The outer diameter of the outer convex ring is the same as the inner diameter of the inner convex ring. The annular space between the regulating core and the valve core is a flow passage. The upper end of the valve core is provided with a flow hole corresponding to the injection hole. The inner wall of the lower connecting sleeve is provided with a sealing element. When the lower end of the adjusting core cooperates with the sealing element, the flow channel is sealed. The inner convex ring coincides with the corresponding outer convex ring. When the adjusting core leaves the sealing element, the space between the inner convex ring and the outer convex ring is the flow channel diameter.

5. An electrically controlled hollow polymerizer according to claim 4, characterized in that, The hollow motor adjustment device includes a hollow motor, a circuit board, and a circuit board support; The circuit board support includes a small-diameter tube and a large-diameter tube, which are connected by a transition step. The outer stator of the hollow motor is embedded in the large-diameter tube and sits on the transition step. The outer wall of the large-diameter tube mates with the inner wall of the motor casing. The outer wall of the small-diameter pipe is connected to a fixing ring, the outer wall of the fixing ring is connected to the inner wall of the motor jacket, the circuit board is sleeved on the outer wall of the small-diameter pipe, located between the large-diameter pipe and the fixing ring, the circuit board is electrically connected to the hollow motor, and the fixing ring is provided with a cable sealing plug.

6. The electrically controlled hollow polymerizer according to claim 3, characterized in that, The outer wall of the upper connecting sleeve is provided with a positioning protrusion ring, the inner wall of the lower end of the motor outer sleeve is connected to the outer wall of the upper end of the upper connecting sleeve and is positioned by the positioning protrusion ring, and the upper end of the inner wall of the injection sleeve is connected to the outer wall of the lower end of the upper connecting sleeve and is positioned by the positioning protrusion ring. The push rod is located in the annular space between the motor outer sleeve and the adjusting core. The inner wall of the upper end of the push rod is connected to the outer wall of the nut, and the inner wall of the lower end of the push rod is connected to the outer wall of the upper end of the adjusting core. The upper end face of the upper connecting sleeve can contact the lower end face of the push rod.

7. The electrically controlled hollow polymerizer according to claim 4, characterized in that, The lower end of the upper connecting sleeve is provided with a concave annular groove, the upper end of the valve core is inserted into the concave annular groove, the upper end of the lower connecting sleeve is provided with an extension tube, the valve core is engaged with the inner wall of the extension tube and the upper end face of the lower connecting sleeve, the upper end face of the extension tube is in contact with the upper connecting sleeve, and the extension tube is provided with an intermediate hole corresponding to the injection hole.

8. The electrically controlled hollow polymerizer according to claim 4, characterized in that, The outer convex ring and the inner convex ring are arc-shaped convex rings. At least two outer convex rings and two inner convex rings are provided and are distributed at equal intervals. The distribution spacing of the outer convex rings and the inner convex rings is equal. The number of outer convex rings and inner convex rings may be the same or different. There is at least one corresponding set of outer convex rings and inner convex rings.

9. A smart layered polymer injection string, characterized in that, Includes intelligent polymer injection units connected via oil pipes, and at least two intelligent polymer injection units are provided; The intelligent polymer injection unit includes, from top to bottom, a packer, an electrically controlled hollow polymerizer as described in any one of claims 1-8, and an electronic flow meter; Each electrically controlled hollow polymerizer corresponds to one oil layer, and the bottommost intelligent polymer injection unit is connected to a plug.

10. A method for using an intelligent layered polymer injection string, characterized in that, Using the intelligent layered polymer injection string of claim 9 includes the following steps: S1. Prepare intelligent polymer injection units with the same number of oil layers to be injected. Connect the cable to the electrically controlled hollow polymer distributor and the electronic flow meter. Run the intelligent polymer injection units into the well through the tubing. S2. On the ground, transmit signals via cable to close all electrically controlled hollow polymerizers, open the lowest electrically controlled hollow polymerizer until the flow rate of the lower layer reaches the injection requirements, open the upper layer electrically controlled hollow polymerizer and adjust it so that the flow rate of the upper layer reaches the injection requirements, and adjust the electrically controlled hollow polymerizers sequentially from bottom to top until the control of all electrically controlled hollow polymerizers is completed.

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