Underground hydraulic pressure regulating bottom-hole regulator for oil and gas well

Abstract

The invention relates to the technical field of oil and gas field development, and discloses an oil and gas downhole hydraulic pressure regulation bottom-hole regulator which comprises a barrel with an upper connector arranged at the end. The conical cylinder is communicated with one end, far away from the upper connector, of the cylinder body, a lower connector is arranged at one end, far away from the cylinder body, of the conical cylinder, and a support ring extending into the cylinder body is arranged at the end part of the conical cylinder; the throttling seat is arranged in the cylinder body and the conical cylinder, the outer wall of the throttling seat is in dynamic sealing connection with the inner wall of the supporting ring, a plurality of nozzles distributed in the length direction of the throttling seat are arranged on the side wall of the throttling seat in the cylinder body, and a plurality of flow guide grooves are formed in the side wall of the throttling seat in the conical cylinder; the guide conical head is connected in the upper connector, the piston rod is connected with the guide conical head, a plurality of guide grooves communicated with the cylinder body are formed in the guide conical head, and the piston rod is in dynamic sealing connection with the inner wall of the throttling seat; the hydraulic cylinder is arranged in the conical barrel and is connected with the throttling seat; the bottom-hole regulator can achieve pressure control and flow stabilization from the source close to an output layer, the purpose of stable production or yield increase is achieved, the adjusting process is stable, and reliability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development, and in particular to a hydraulic pressure regulating and production distributor for oil and gas wells. Background Art

[0002] During oil and gas well production, a three-phase flow of oil, gas, and water occurs within the wellbore. For self-flowing wells with high formation pressure, it's necessary to adjust gas and liquid production based on wellbore fluid pressure, temperature, flow rate, and other parameters to achieve sustained, stable production, or even increase production.

[0003] Existing methods for controlling wellbore pressure in oil and gas wells primarily employ surface pipeline throttling, heat exchange, and separation. These methods are not only costly, but also unable to achieve pressure control and stable flow close to the source of the production layer, making it difficult to adjust production strategies in a timely manner. Summary of the Invention

[0004] The present invention proposes a downhole hydraulic pressure regulating and production distributor for oil and gas to address the deficiencies in the above-mentioned prior art. The downhole hydraulic pressure regulating and production distributor for oil and gas can control pressure and stabilize flow from the source close to the production layer, and can adjust the mining strategy in time to achieve the purpose of stabilizing or increasing production.

[0005] The technical solution of the present invention is: a downhole hydraulic pressure regulating and production distribution device for oil and gas, comprising:

[0006] An upper connector is provided at the end of the cylinder;

[0007] The cone is connected to the end of the cylinder away from the upper connector, the end of the cone away from the cylinder is provided with a lower connector, and the end of the cone is provided with a support ring extending into the cylinder;

[0008] The throttle is provided in the cylinder and the cone, the outer wall of the throttle seat is dynamically sealed with the inner wall of the support ring, a plurality of nozzles are provided on the side wall of the throttle seat in the cylinder and arranged along the length direction of the throttle seat, the inner diameters of the plurality of nozzles are different, and a plurality of guide grooves are provided on the side wall of the throttle seat in the cone;

[0009] The regulating member includes a guide cone connected to the upper connector and a piston rod connected to the guide cone. The guide cone is provided with a plurality of guide grooves communicating with the cylinder. The end of the piston rod extends into the throttle seat and is dynamically sealed with the inner wall of the throttle seat.

[0010] The hydraulic cylinder is arranged in the conical cylinder, and the hydraulic piston and the throttle seat are used to drive the throttle seat to move axially in the cylinder body and the conical cylinder.

[0011] In at least one embodiment of the present invention, the end of the cone away from the cylinder body is provided with a sealing cylinder, the lower connector is connected to the end of the sealing cylinder away from the cone, and the hydraulic cylinder includes:

[0012] The hydraulic joint is arranged in the sealing cylinder, and a flow channel is provided on the hydraulic joint;

[0013] The closed end of the cylinder is connected to the throttle seat, and the piston head is slidably connected in the cylinder.

[0014] One end of the hydraulic piston extends into the hydraulic joint. A second sealing ring is provided on the hydraulic piston in the hydraulic joint. The second sealing ring abuts against the inner wall of the hydraulic joint to form a hydraulic seal. The other end of the hydraulic piston extends into the cylinder body and is connected to the piston head.

[0015] In at least one embodiment of the present invention, the inner cavities of the upper joint, cylinder, cone cylinder, sealing cylinder and lower connecting head are all eccentrically arranged, and the outer walls of the upper joint, cylinder, cone cylinder, sealing cylinder and lower connecting head are provided with interconnected wire grooves, and two hydraulic pipes are embedded in the wire grooves, and the two hydraulic pipes are respectively connected to the hydraulic joint and the cylinder body.

[0016] In at least one embodiment of the present invention, a straightening ring is provided on the outer wall of the throttle seat, and first sealing rings are provided on both sides of the straightening ring on the outer wall of the throttle seat. The straightening ring and the two first sealing rings are in contact with the inner wall of the support ring.

[0017] In at least one embodiment of the present invention, a plurality of annular grooves are provided around the piston rod in the throttle seat, and sealing fillers are installed in each of the plurality of annular grooves.

[0018] In at least one embodiment of the present invention, the plurality of guide grooves are divided into two groups, and the two groups of guide grooves are respectively arranged along the length direction of the throttle seat, and the guide grooves in each group are distributed in a ring shape around the circumference of the throttle seat, and each guide groove is a strip-shaped through groove arranged along the length direction of the throttle seat.

[0019] In at least one embodiment of the present invention, the plurality of nozzles are divided into multiple groups along the length direction of the throttle seat, each group of nozzles is arranged along the circumference of the throttle seat, and 4 to 6 groups of upper nozzles of the throttle seat are arranged along the length direction.

[0020] In at least one embodiment of the present invention, a sand-proof screen is provided in the upper connector, and the material of the sand-proof screen is hard alloy.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention is provided with a cylinder with an upper connecting head, a cone connected to the cylinder, a throttle seat with multiple nozzles, an adjusting member composed of a guide cone head and a piston rod, and a hydraulic cylinder for driving the throttle seat to move; when the oil and gas downhole hydraulic pressure regulating production distributor is in use, the upper connecting head and the lower connecting head are connected to the oil pipe with threads and lowered into the well together; during the production process, the produced oil, gas and water flow is guided to the guide groove inside the cone head, enters the annulus between the cylinder and the throttle seat, then enters the interior of the throttle seat through the nozzle, and then flows out through the guide groove into the annulus between the cone cylinder and the hydraulic cylinder, and flows into the downstream oil pipe through the flow channel; during the operation of the distributor, the throttle seat is driven to move between the cylinder and the cone by controlling the hydraulic cylinder The axial movement in the cylinder is carried out to change the length of the piston rod extending into the throttle seat, thereby adjusting the flow area of ​​the throttle nozzle and the flow pressure. Since the pressure drop of the three phases of oil, gas and water is different when passing through nozzles of different areas, the flow velocity and pressure of the three phases of oil, gas and water can be controlled to achieve the purpose of stable production or increased production. Compared with the existing technology, the production distributor adjusts the flow area of ​​the nozzle in the pipe through hydraulic control telescopic adjustment to achieve the flow pressure of the three-phase mixed medium of oil, gas and water in the pipe, meet the purpose of three-phase mixing, homogeneity, and increase gas-liquid carrying, can achieve pressure control and steady flow from close to the source of the production layer, can better understand the dynamic changes of the oil reservoir, and adjust the extraction strategy in time, such as reasonably arranging water injection, gas injection and other measures to improve the development efficiency of the entire oil field.

[0023] 2. The present invention comprises a hydraulic cylinder composed of a hydraulic joint, a cylinder body and a hydraulic piston. The hydraulic joint and the cylinder body are both connected to hydraulic pipelines extending to the ground. During the operation of the dispenser, the throttle seat can be quickly adjusted through the two hydraulic pipelines on the ground. The drive during the adjustment process is stable, the driving force is large, the adjustment process is smooth, and the reliability is high. In addition, the overall structure and control system of the present invention are simple, which reduces the manufacturing and control costs compared with the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main cross-sectional structure of the present invention.

[0025] Figure 2 The main cross-sectional view of the present invention is a schematic diagram of the local structure Figure 1 .

[0026] Figure 3 The main cross-sectional view of the present invention is a schematic diagram of the local structure Figure 2 .

[0027] Figure 4 It is a structural schematic diagram of the throttle seat and hydraulic cylinder of the present invention.

[0028] Figure 5 This is a schematic diagram of the lower connector structure of the present invention.

[0029] Figure 6This is a schematic structural diagram of the guide cone head and piston rod of the present invention.

[0030] Description of reference numerals:

[0031] 1. Cylinder body; 11. Upper connector; 2. Conical cylinder; 21. Lower connector; 22. Support ring; 3. Throttle seat; 31. Nozzle; 32. Guide groove; 33. Stabilizer; 34. First sealing ring; 4. Guide cone head; 41. Guide groove; 5. Piston rod; 51. Annular groove; 52. Sealing packing; 6. Hydraulic cylinder; 61. Hydraulic joint; 611. Flow channel; 62. Cylinder body; 621. Piston head; 63. Hydraulic piston; 631. Second sealing ring; 7. Sealing cylinder; 8. Wire groove; 9. Sand control screen. DETAILED DESCRIPTION

[0032] The drawings in the present invention are not drawn strictly to scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic structural diagrams.

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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 described 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.

[0034] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "up", "down", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0035] This dispenser regulates the flow pressure of the three-phase oil, gas, and water mixture within the pipe by adjusting the flow area through hydraulically controlled expansion and contraction. Combined with a regulation algorithm, it achieves the goal of achieving homogeneous mixing and increased gas-liquid carrying capacity. The intermittent, graded throttle structure significantly controls gas pressure while also regulating the oil-water flow rate.

[0036] Controlling pressure and stabilizing flow close to the source of the producing layer facilitates refined reservoir management. Precise control of pressure and flow allows for a better understanding of reservoir dynamics and timely adjustments to production strategies, such as the rational arrangement of water and gas injections. This results in more scientific and rational reservoir development and improved overall oilfield efficiency.

[0037] Controlling pressure and stabilizing flow at the source of the production layer can ensure the smooth progress of the oil extraction process, reduce oil spills that may be caused by pressure loss or abnormal flow, thereby reducing pollution to the environment and meeting the requirements of sustainable development.

[0038] Combine Figures 1 to 6 As shown, a downhole hydraulic pressure regulating and production distribution device for oil and gas wells comprises:

[0039] An upper connector 11 is provided at the end of the cylinder 1 ; the cylinder 1 is threadedly connected to the upper connector 11 .

[0040] The cone 2 is connected to the end of the cylinder 1 away from the upper connector 11. The end of the cone 2 away from the cylinder 1 is provided with a lower connector 21. The end of the cone 2 is provided with a support ring 22 extending into the cylinder 1.

[0041] The throttle seat 3 is disposed within the cylinder 1 and the conical cylinder 2. The outer wall of the throttle seat 3 is dynamically sealed with the inner wall of the support ring 22, and no fluid is allowed to flow between the throttle seat 3 and the support ring 22. A plurality of nozzles 31 are provided on the side wall of the throttle seat 3 within the cylinder 1 and arranged along the length of the throttle seat 3. The plurality of nozzles 31 have different inner diameters. A plurality of guide grooves 32 are provided on the side wall of the throttle seat 3 within the conical cylinder 2.

[0042] The adjusting part includes a guide cone head 4 connected to the upper connecting head 11 and a piston rod 5 connected to the guide cone head 4. The outer wall of the guide cone head 4 is threadedly fixed to the upper connecting head 11. The guide cone head 4 is provided with a plurality of guide grooves 41 connected to the cylinder 1. The end of the piston rod 5 extends into the throttle seat 3 and is dynamically sealed with the inner wall of the throttle seat 3; the male thread at the other end of the piston rod 5 is fastened to the built-in female thread of the guide cone head 4.

[0043] The hydraulic cylinder 6 is arranged in the conical cylinder 2, and the hydraulic piston 61 of the hydraulic cylinder 6 is connected to the throttle seat 3. The hydraulic cylinder 6 is used to drive the throttle seat 3 to move axially in the cylinder body 1 and the conical cylinder 2 to adjust the flow area of ​​the nozzle 31 in the throttle seat 3; the area of ​​the nozzle 31 can be the same or different. The difference is that the nozzles 31 with the same area adjust the flow linearly, and the nozzles 31 with different areas adjust the flow nonlinearly. Specifically, the area of ​​the nozzle 31 can be selectively adjusted according to production requirements.

[0044] As an alternative embodiment, the end of the conical cylinder 2 away from the cylinder body 1 is provided with a sealing cylinder 7 connected, and the lower connecting head 22 is connected to the end of the sealing cylinder 7 away from the conical cylinder 2. The hydraulic cylinder 6 includes: a hydraulic cylinder 6, a cylinder body 62 and a hydraulic piston 63. The hydraulic joint 61 is arranged in the sealing cylinder 7. The hydraulic joint 61 is provided with a flow channel 611, and the flow channel 611 allows fluid to pass through; the closed end of the cylinder body 62 is connected to the throttle seat 3, and a piston head 621 is slidably connected in the cylinder body 62. One end of the hydraulic piston 63 extends into the hydraulic joint 61, and a second sealing ring 631 is provided on the hydraulic piston 63 in the hydraulic joint 61. The second sealing ring 631 abuts against the inner wall of the hydraulic joint 61 to form a hydraulic seal. The other end of the hydraulic piston 61 extends into the cylinder body 62 and is connected to the piston head 621; this type of hydraulic cylinder has stable driving, large driving force, smooth adjustment process and high reliability during the adjustment process.

[0045] As an alternative embodiment, the inner cavities of the upper joint 11, the cylinder 1, the cone 2, the sealing cylinder 7 and the lower connecting head 21 are all eccentrically arranged, and the outer walls of the upper joint 11, the cylinder 1, the cone 2, the sealing cylinder 7 and the lower connecting head 21 are provided with interconnected wire grooves 8, and two hydraulic pipes are embedded in the wire grooves 8, which are respectively connected to the hydraulic joint 62 and the cylinder body 63. The setting of the wire grooves 8 can accommodate the hydraulic pipes, thereby ensuring the stable connection between the hydraulic pipes and the hydraulic joint 62 and the cylinder body 63, and avoiding damage to the hydraulic pipes during the process of lowering the production device into the well.

[0046] As an alternative embodiment, a straightening ring 33 is provided on the outer wall of the throttle seat 3, and first sealing rings 34 are provided on both sides of the straightening ring 33 on the outer wall of the throttle seat 3, and the straightening ring 33 and the two first sealing rings 34 are all in contact with the inner wall of the support ring 22; the setting of the straightening ring 33 can ensure that the movement of the throttle seat 3 is smoother, so that the throttle seat 3 can be precisely matched with the piston rod 5 to achieve the adjustment of the flow area of ​​the nozzle 31; the setting of the two first sealing rings 34 can ensure that there is sufficient dynamic sealing between the throttle seat 3 and the support ring 22, thereby completely avoiding the fluid from flowing between the throttle seat 3 and the branch ring 22, and fully ensuring the stable operation of the dispenser.

[0047] As an alternative embodiment, a plurality of annular grooves 51 are provided on the circumference of the piston rod 5 in the throttle seat 3, and sealing fillers 52 are installed in each of the plurality of annular grooves 51; the filling of the sealing fillers 52 ensures sufficient dynamic sealing between the piston rod 5 and the inner wall of the throttle seat 3, thereby ensuring that during the process of adjusting the flow area of ​​the nozzle 31, the closed nozzle 31 will no longer allow fluid to pass through, thereby ensuring the accuracy of the adjustment.

[0048] As an alternative embodiment, multiple guide grooves 32 are divided into two groups, and the two groups of guide grooves 32 are respectively arranged along the length direction of the throttle seat 3. Each group of guide grooves 32 is distributed in a ring shape on the circumference of the throttle seat 3, and each guide groove 32 is a strip-shaped through groove arranged along the length direction of the throttle seat 3; an intermittent graded throttle nozzle structure is adopted, which is effective in controlling the gas pressure and can also adjust the oil-water flow rate.

[0049] As an alternative embodiment, multiple nozzles 31 are divided into multiple groups along the length direction of the throttle seat 3, and each group of nozzles 31 is arranged along the circumference of the throttle seat 3. The upper nozzles 31 of the throttle seat 3 are provided with 4 to 6 groups along the length direction; preferably, the number of groups of nozzles 31 is 5, so that one small stage adjustment of the hydraulic cylinder 6 can open one more group of nozzles 31.

[0050] As an alternative embodiment, a sand-proof screen 9 is provided in the upper connector 11, and the sand-proof screen 9 is threadedly connected to the upper connector 11. The material of the sand-proof screen 9 is cemented carbide; the choice of this material enables the guide cone head 4 and the nozzle 31 to withstand long-term sand erosion.

[0051] The working principle and usage of this embodiment:

[0052] The present invention provides a downhole hydraulic pressure regulating and distributing device for oil and gas. When the downhole hydraulic pressure regulating and distributing device is in use, the upper connector 11 and the lower connector 21 are fastened to the oil pipe or other tools using threads and lowered into the well together with the oil pipe. The hydraulic oil in two hydraulic pipelines is pressurized on the ground in both directions to pressurize the two left and right chambers in the hydraulic piston 63. The control cylinder 62 and the throttle seat 3 move together along the axial direction of the tool to adjust the flow area of ​​the nozzle 31 in the throttle seat 3 and adjust the flow pressure. During operation, the produced oil, gas and water flow through the sand-proof screen 9 to filter solid sand particles, flow through the guide groove 41 inside the guide cone head 4, enter the annulus between the cylinder 1 and the throttle seat 3, pass through the nozzle 31 to enter the inside of the throttle seat 3, and then flow out through the guide groove 32 to enter the annulus between the cone 2 and the hydraulic cylinder 6, and flow into the downstream oil pipe through the flow channel 611.

[0053] Since the pressure drops of the three phases of oil, gas and water are different when passing through the nozzles 31 of different areas, the flow rate and pressure of the three phases of oil, gas and water can be controlled to achieve the purpose of stabilizing or increasing production.

[0054] If you want to reduce the oil flow rate, you can choose a nozzle 31 that causes a larger pressure drop in the oil, so that the oil flow rate will be reduced; if you want to increase the gas flow rate, you can choose a nozzle 31 that causes a smaller pressure drop in the gas, so that the gas flow rate will be increased.

[0055] At the same time, the nozzle's pressure drop also affects the three-phase pressure. When nozzle 31 produces a large pressure drop, the pressure of the fluid after passing through nozzle 31 decreases, and vice versa. This pressure change can be used to adjust the pressure state of the oil, gas, and water three-phases during subsequent production.

[0056] In the process of oil and gas extraction, stable production is very important. By properly controlling the flow rate and pressure of the three phases of oil, gas and water, the oil and gas production process can be kept stable. For example, when it is found that the oil production has a downward trend, the oil flow rate and pressure can be changed by adjusting the area of ​​the nozzle 31 to restore its production to a stable level. For increased production, the appropriate selection of nozzle 31 can optimize the flow state of the three phases of oil, gas and water. For example, by optimizing the nozzle 31, the flow rate and pressure of the gas can be optimized, thereby better carrying oil and water from the formation to the wellhead, increasing the production of oil and gas. At the same time, reasonable pressure control can avoid the decline in oil and gas production caused by too low formation pressure, or avoid safety hazards caused by too high pressure.

[0057] The above embodiments are only specific implementation methods of the patent of the present invention, which are used to illustrate the technical solutions of the patent of the present invention rather than to limit it. The protection scope of the patent of the present invention is not limited thereto. Although the patent of the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions implemented by the patent of the present invention, and should all be covered by the protection scope of the present invention.

Claims

1. A hydraulic pressure regulating and production distribution device for oil and gas wells, characterized in that: include: A cylindrical body (1) having an upper connector (11) at its end; The conical cylinder (2) is connected to the end of the cylinder (1) away from the upper connector (11), the end of the conical cylinder (2) away from the cylinder (1) is provided with a lower connector (21), and the end of the conical cylinder (2) is provided with a support ring (22) extending into the cylinder (1); A throttle seat (3) is arranged in the cylinder (1) and the cone (2), the outer wall of the throttle seat (3) is dynamically sealed with the inner wall of the support ring (22), a plurality of nozzles (31) arranged along the length direction of the throttle seat (3) are provided on the side wall of the throttle seat (3) in the cylinder (1), the plurality of nozzles (31) having different inner diameters, and a plurality of guide grooves (32) are provided on the side wall of the throttle seat (3) in the cone (2); The regulating member comprises a guide cone head (4) connected to the upper connecting head (11) and a piston rod (5) connected to the guide cone head (4), wherein the guide cone head (4) is provided with a plurality of guide grooves (41) communicating with the cylinder (1), and the end of the piston rod (5) extends into the throttle seat (3) and is dynamically sealed with the inner wall of the throttle seat (3); The hydraulic cylinder (6) is arranged in the conical cylinder (2) and is connected to the throttle seat (3) for driving the throttle seat (3) to move axially in the cylinder body (1) and the conical cylinder (2).

2. The oil and gas downhole hydraulic pressure regulating and production distribution device according to claim 1, characterized in that: The end of the cone cylinder (2) away from the cylinder body (1) is provided with a sealing cylinder (7) connected thereto, the lower connecting head (22) is connected to the end of the sealing cylinder (7) away from the cone cylinder (2), and the hydraulic cylinder (6) comprises: A hydraulic joint (61) is arranged in the sealing cylinder (7), and a flow channel (611) is provided on the hydraulic joint (61); The cylinder (62) has a closed end connected to the throttle seat (3), and a piston head (621) is slidably connected in the cylinder (62). One end of the hydraulic piston (63) extends into the hydraulic joint (61). A second sealing ring (631) is provided on the hydraulic piston (63) in the hydraulic joint (61). The second sealing ring (631) abuts against the inner wall of the hydraulic joint (61) to form a hydraulic seal. The other end of the hydraulic piston (61) extends into the cylinder body (62) and is connected to the piston head (621).

3. The oil and gas downhole hydraulic pressure regulating and production distribution device according to claim 2, characterized in that: The inner cavities of the upper joint (11), the cylinder (1), the conical cylinder (2), the sealing cylinder (7) and the lower connecting head (21) are all eccentrically arranged, and the outer walls of the upper joint (11), the cylinder (1), the conical cylinder (2), the sealing cylinder (7) and the lower connecting head (21) are all provided with mutually communicating wire grooves (8), and two hydraulic pipes are embedded in the wire grooves (8), and the two hydraulic pipes are respectively connected to the hydraulic joint (62) and the cylinder body (63).

4. The oil and gas downhole hydraulic pressure regulating and production distribution device according to claim 1, characterized in that: A stabilizing ring (33) is provided on the outer wall of the throttle seat (3), and first sealing rings (34) are provided on both sides of the stabilizing ring (33) on the outer wall of the throttle seat (3). The stabilizing ring (33) and the two first sealing rings (34) are in contact with the inner wall of the support ring (22).

5. The oil and gas downhole hydraulic pressure regulating and production distribution device according to claim 1, characterized in that: A plurality of annular grooves (51) are provided on the circumference of the piston rod (5) in the throttle seat (3), and sealing fillers (52) are installed in the plurality of annular grooves (51).

6. The oil and gas downhole hydraulic pressure regulating and production distribution device according to claim 1, characterized in that: The plurality of guide grooves (32) are divided into two groups. The two groups of guide grooves (32) are respectively arranged along the length direction of the throttle seat (3). The guide grooves (32) of each group are distributed in an annular shape in the circumference of the throttle seat (3). Each guide groove (32) is a strip-shaped through groove arranged along the length direction of the throttle seat (3).

7. The oil and gas downhole hydraulic pressure regulating and production distribution device according to claim 1, characterized in that: The plurality of nozzles (31) are divided into a plurality of groups along the length direction of the throttle seat (3), and each group of the nozzles (31) is arranged along the circumference of the throttle seat (3). Four to six groups of upper nozzles (31) of the throttle seat (3) are arranged along the length direction.

8. The oil and gas downhole hydraulic pressure regulating and production distribution device according to claim 1, characterized in that: A sand-proof screen (9) is provided in the upper connector (11), and the material of the sand-proof screen (9) is hard alloy.

Images