A downhole gas-liquid separation device

Abstract

The application provides a downhole gas-liquid separation device, which comprises a gas-liquid separation assembly, a gas reinjection assembly, a connecting assembly and a liquid sampling assembly; the gas-liquid separation assembly comprises a first communication component and a cyclone; the cyclone comprises an inner lining slide, an inner lining and a separation cavity; the inner lining can slide along the inner lining slide; the first communication component is used for conveying a gas-liquid mixture to the separation cavity; the separation cavity is used for separating the gas-liquid mixture; the liquid sampling assembly is driven by a lifting device to suck the liquid separated in the separation cavity; and the gas reinjection assembly is driven by the liquid sampling assembly to suck the gas separated in the separation cavity and discharge the separated gas. The downhole gas-liquid separation device provided by the application can improve the gas-liquid separation efficiency by changing the position of the inner lining to adjust the length of the gas core, and can adapt to different well conditions by changing the position of the inner lining to adapt to oil wells with different gas content of the gas-liquid mixture.

Description

Technical Field

[0001] This invention relates to the field of downhole gas-liquid separation equipment technology, and particularly to a downhole gas-liquid separation device. Background Technology

[0002] Gas inside the wellbore can negatively impact the stable, efficient, and normal operation of lifting equipment such as pumping units. To improve the application range and adaptability of pumping units to gas, downhole gas-liquid separators are needed to separate gas and liquid and discharge gas. Summary of the Invention

[0003] The existing technology has the following shortcomings: existing downhole gas-liquid separation devices have low gas-liquid separation efficiency and cannot adapt to different well conditions, thus having a limited scope of application. In view of the above problems, it is necessary to propose a downhole gas-liquid separation device to solve or partially solve these problems. The technical solution proposed in this invention is as follows:

[0004] This invention proposes a downhole gas-liquid separation device, comprising a gas-liquid separation component, a gas reinjection component, a connection component, and a fluid production component;

[0005] The gas-liquid separation assembly includes a first connecting component and a hydrocyclone; the hydrocyclone includes an inner liner slide, an inner liner, and a separation chamber; the inner liner slide is connected to the first connecting component, the inner liner is located between the first connecting component and the inner liner slide, and the inner liner is slidable along the inner liner slide; the separation chamber is connected to the first connecting component, the first connecting component is used to transport the gas-liquid mixture to the separation chamber, and the separation chamber is used to separate the gas-liquid mixture;

[0006] The first connecting component connects the gas reinjection assembly and the connecting assembly respectively, and the connecting assembly is connected to the gas reinjection assembly and the liquid collection assembly respectively; the first connecting component and the gas reinjection assembly form a first gas channel, and the gas reinjection assembly and the connecting assembly form a second gas channel; the first connecting component, the connecting assembly, and the liquid collection assembly form a liquid channel;

[0007] The liquid collection assembly is used to connect to an external lifting device to draw the liquid separated in the separation chamber through the liquid channel under the drive of the lifting device.

[0008] The gas reinjection assembly is connected to the liquid collection assembly and is used to draw the gas separated in the separation chamber through the first gas channel under the drive of the liquid collection assembly, and to discharge the separated gas through the second gas channel.

[0009] Furthermore, the inner lining slide includes a first boss and a cylindrical slide that are connected to each other. The end of the cylindrical slide away from the first boss is connected to the first communicating component. The inner lining slide is provided with a vent hole that passes through the first boss and the cylindrical slide. The vent hole connects the separation chamber and the first gas channel.

[0010] The hydrocyclone further includes a reset unit, which includes a first spring and an annular plate connected to one end of the first spring. The annular plate is connected to the inner liner. The first spring is located between the cylindrical slide and the inner liner. The end of the first spring away from the annular plate abuts against the first boss.

[0011] The first spring has the following two states: in the first state, the first spring is in a relaxed state; in the second state, the first spring is in a compressed state.

[0012] When the downhole gas-liquid separator is in use, if the gas content of the downhole gas-liquid mixture exceeds a first preset threshold, the liner slides down along the cylindrical slide under the pressure of the gas, lengthening the gas core, and the first spring switches from the first state to the second state.

[0013] Furthermore, the liner includes a straight tube and a conical tube coaxially connected. The straight tube is connected to the annular plate. A serrated slot is provided at the end of the conical tube away from the straight tube. A spiral flow channel is provided on the outer wall of the conical tube, extending to the serrated slot. A liquid-throwing through hole is provided on the spiral flow channel, penetrating the outer wall and side wall of the spiral flow channel.

[0014] Furthermore, the hydrocyclone also includes a first outer cylinder, a second outer cylinder and a base, as well as a guide cone, a plug, a liquid guiding groove seat, a third outer cylinder and a fourth outer cylinder disposed in the second outer cylinder;

[0015] The second outer cylinder is placed inside the first outer cylinder and is connected to the fourth outer cylinder;

[0016] The base is connected to the first outer cylinder, and a liquid storage annulus is formed between the base, the first outer cylinder, and the second outer cylinder. The liquid storage annulus is connected to the first connecting component.

[0017] The third outer cylinder and the fourth outer cylinder are funnel-shaped, and the large-diameter end of the third outer cylinder is connected to the first communicating component.

[0018] The small-diameter end of the fourth outer cylinder is connected to the small-diameter end of the third outer cylinder;

[0019] The plug is slidably connected to the liquid guiding groove seat, and the plug can move along the liquid guiding groove seat. The plug is placed in the fourth outer cylinder, and the plug is provided with a first through hole that allows the guide cone to pass through.

[0020] The liquid guiding groove seat is connected to the guide cone and the base respectively. The liquid guiding groove seat is provided with a liquid guiding through hole, which is connected to the separation chamber and the liquid storage annulus respectively.

[0021] Furthermore, the hydrocyclone also includes a second spring and at least one sliding pin, and the plug includes a frustum, a first cylinder and a first circular tube, with the frustum and the first circular tube disposed at both ends of the first cylinder;

[0022] The smaller diameter end of the frustum is close to the smaller diameter end of the fourth outer cylinder, and the cavity formed by the frustum, the third outer cylinder, and the fourth outer cylinder constitutes the separation cavity;

[0023] The end face of the first cylinder is used to limit the second spring, and the first through hole passes through the frustum and the first cylinder;

[0024] The first circular tube is provided with at least one radial first countersunk hole at the end away from the first cylinder, the liquid guiding slide seat is provided with at least one axial first slide groove, and the sliding pin is placed in the first countersunk hole and the first slide groove so that the first circular tube can move along the first slide groove.

[0025] The second spring is sleeved on the liquid guiding groove seat and placed between the first circular tube and the liquid guiding groove seat. The second spring has the following two states: in the third state, the second spring is in a relaxed state; in the fourth state, the second spring is in a compressed state.

[0026] When the downhole gas-liquid separator is in use, if the volume of liquid in the separation chamber exceeds a second preset threshold, the first circular tube slides down along the first groove under the pressure of the liquid, increasing the flow rate of the separated liquid out of the separation chamber, and the second spring switches from the third state to the fourth state.

[0027] Furthermore, the liquid guiding groove seat includes a first stepped boss and a second circular tube. The first stepped boss includes a second boss and a third boss. The third boss and the second circular tube are respectively located at both ends of the second boss. The liquid guiding through hole is disposed on the first stepped boss and passes through the second boss and the third boss. The first groove is disposed on the outer wall of the second circular tube. The second boss has a second countersunk hole at its center. The second countersunk hole is threadedly connected to the guide cone. The outer wall of the second boss is threadedly connected to the fourth outer cylinder. The center of the third boss is connected to a second cylinder, which is connected to the base.

[0028] Furthermore, a first axial hole is provided through the center of the first connecting component. The first axial hole connects to the gas reinjection component and forms the first gas channel. The sidewall of the first axial hole is provided with at least one first radial hole and at least one second axial hole. The first radial hole is used to transport the gas-liquid mixture to the separation chamber. The second axial hole connects to the connecting component and forms the liquid channel with the connecting component and the liquid sampling component.

[0029] Furthermore, the first axial hole is a stepped through hole, which includes a second through hole and a third through hole;

[0030] The inner wall of the second through hole is provided with a first internal thread, and the end of the cylindrical slide away from the first boss is provided with a first external thread. The cylindrical slide and the second through hole are assembled as one unit, and the first internal thread and the first external thread cooperate.

[0031] The first connecting component has a cylindrical protrusion at one end near the third through hole. The large-diameter end of the third outer cylinder is cylindrical. The third outer cylinder and the third through hole are assembled as one unit. The cylindrical protrusion cooperates with the large-diameter end of the third outer cylinder.

[0032] Furthermore, it also includes a first connecting rod and a first connecting pipe. The first connecting rod passes through the first connecting pipe and is connected to the gas reinjection assembly and the liquid collection assembly, respectively. The first connecting component is provided with a first annular protrusion at one end near the second through hole, and the first connecting pipe is provided with a first annular groove matching the first annular protrusion at one end, and the other end is connected to the gas reinjection assembly.

[0033] Furthermore, the gas reinjection assembly includes a first transmission assembly, a first fixed valve, a first cylindrical hollow cylinder, a first movable valve, and at least one second pin.

[0034] The first transmission assembly is connected to the first connecting rod and the first cylindrical hollow cylinder respectively, and is used to convert the linear motion of the first connecting rod into the rotational motion of the first cylindrical hollow cylinder.

[0035] The first cylindrical hollow tube is rotatably connected to the first fixed valve, and the outer wall of the first cylindrical hollow tube is provided with a first arc-shaped groove; one end of the first cylindrical hollow tube is open and the other end is closed;

[0036] The first fixed valve is a hollow cylinder, and the inner wall of the first fixed valve is provided with at least one second sliding groove along the axial direction; the first fixed valve is provided with a second annular protrusion at one end near the first ball seat hole, and the other end of the first connecting pipe is provided with a second annular groove that matches the second annular protrusion;

[0037] The first movable valve is cylindrical, with one end closed and the other end open. The open end of the first movable valve faces the open end of the first hollow cylindrical tube. The side wall of the first movable valve is provided with at least one fourth through hole. The outer wall of the first movable valve is provided with at least one first strip-shaped protrusion that matches the second sliding groove.

[0038] The second pin is placed in the fourth through hole and the first arc-shaped groove.

[0039] Furthermore, the closed end of the first cylindrical hollow tube is provided with at least one third axial hole; the two end faces of the first fixed valve are respectively provided with a fifth through hole and a first ball seat hole, the fifth through hole is used for the first connecting rod to pass through, and the first ball seat hole communicates with the second through hole; the closed end of the first movable valve is provided with a second ball seat hole;

[0040] The second through hole, the first ball seat hole, and the second ball seat hole form the first gas channel, and the third axial hole, the fifth through hole, and the connecting assembly form the second gas channel.

[0041] Furthermore, it also includes at least one third pin;

[0042] The inner wall of the first fixed valve is provided with a second stepped boss in the middle, the second stepped boss includes a fourth boss and a fifth boss; the protrusion height of the fourth boss is greater than that of the fifth boss, and the end face of the fourth boss is used to limit the first movable valve; the end face of the fifth boss abuts against the first cylindrical hollow cylinder, and the fifth boss is provided with at least one radial sixth through hole.

[0043] The outer wall of the first cylindrical hollow tube is provided with a first annular groove, and the third pin is placed in the sixth through hole and the first annular groove.

[0044] Furthermore, the first transmission component includes a first bevel gear and a second bevel gear. The first bevel gear is connected to the first connecting rod and the first fixed valve, respectively. The second bevel gear is connected to the first cylindrical hollow cylinder, and the second bevel gear meshes with the first bevel gear.

[0045] Furthermore, the first bevel gear is provided with a first mounting hole and a second mounting hole. The first mounting hole penetrates the center of the end face of the first bevel gear, and the second mounting hole is an eccentric hole that penetrates the end face of the first bevel gear.

[0046] The inner wall of the first fixed valve is provided with a first gear seat. The first gear seat includes a sixth boss and a third cylinder. The third cylinder is arranged radially along the first fixed valve. The first bevel gear is sleeved on the third cylinder, and the end face of the first bevel gear abuts against the sixth boss.

[0047] The closed end of the first cylindrical hollow cylinder is provided with a second gear seat. The second gear seat includes a first base plate and a fourth cylinder. The fourth cylinder is perpendicular to the center of the first base plate. The second bevel gear is sleeved on the fourth cylinder, and the end face of the second bevel gear abuts against the first base plate.

[0048] Furthermore, the outer wall of the third cylinder is provided with a second external thread, which is used to limit the first bevel gear by engaging with the second external thread through a bolt.

[0049] Furthermore, it also includes a second link, the connecting assembly including a second communicating component and a second connecting pipe;

[0050] The second link is connected to both the lifting device and the fluid collection assembly.

[0051] The second connecting component has a fourth axial hole through its center. The sidewall of the fourth axial hole has at least one second radial hole and at least one fifth axial hole. The second radial hole, the third axial hole, and the fifth through hole form the second gas channel. The fifth axial hole connects the second axial hole and the second connecting pipe.

[0052] The two ends of the second connecting pipe are respectively connected to the second communicating component and the liquid collection assembly. The second connecting pipe is provided with at least one third radial hole. The third radial hole, the fifth axial hole, the second axial hole and the liquid collection assembly form the liquid channel.

[0053] Furthermore, the fourth axial hole is a stepped through hole, which includes a seventh through hole and an eighth through hole;

[0054] The first fixed valve has a third annular protrusion at one end near the fifth through hole, and the second connecting component has a fourth annular protrusion at one end near the eighth through hole, and the fourth annular protrusion is connected to the third annular protrusion.

[0055] The second connecting pipe is a stepped pipe, which includes a third round pipe and a fourth round pipe. The third round pipe is placed in the seventh through hole, and the outer wall of the third round pipe is attached to the inner wall of the seventh through hole. The third radial hole is provided on the fourth round pipe. The end face of the fourth round pipe near the third round pipe abuts against the end face of the seventh through hole. The second connecting rod is attached to the inner wall of the third round pipe.

[0056] Furthermore, the liquid sampling assembly includes a push rod assembly, a second transmission assembly, a second fixed valve, a second cylindrical hollow cylinder, a second movable valve, and at least one fourth pin.

[0057] The second transmission assembly is connected to the second connecting rod and the second hollow cylindrical tube respectively, and is used to convert the linear motion of the second connecting rod into the rotational motion of the second hollow cylindrical tube;

[0058] The second cylindrical hollow tube is rotatably connected to the second fixed valve, and the outer wall of the second cylindrical hollow tube is provided with a second arc-shaped groove; one end of the second cylindrical hollow tube is open and the other end is closed;

[0059] The second fixed valve is a hollow cylinder, and the inner wall of the second fixed valve is provided with at least one third sliding groove along the axial direction; a fifth annular protrusion is provided at one end of the second fixed valve near the third ball seat hole, and a sixth annular protrusion is provided on the end face of the fourth tube away from the third tube, and the sixth annular protrusion is connected to the fifth annular protrusion.

[0060] The second movable valve is cylindrical, with one end closed and the other end open, the open end of the second movable valve facing the open end of the second cylindrical hollow cylinder; the outer wall of the second movable valve is provided with at least one second strip-shaped protrusion that matches the third sliding groove; at least one tenth through hole is provided on the side wall of the second movable valve.

[0061] The fourth pin is placed in the tenth through hole and the second arc-shaped groove;

[0062] The push rod assembly passes through the second movable valve and is connected to the second connecting rod.

[0063] Furthermore, it also includes at least one fifth pin;

[0064] The inner wall of the second fixed valve is provided with a third stepped boss, which includes a seventh boss and an eighth boss; the height of the seventh boss is greater than that of the eighth boss, and the end face of the seventh boss is used to limit the second movable valve; the end face of the eighth boss abuts against the second cylindrical hollow cylinder, and the eighth boss is provided with at least one radially eleventh through hole.

[0065] The outer wall of the second movable valve is provided with a second annular groove, and the fifth pin is placed in the eleventh through hole and the second annular groove.

[0066] Furthermore, the closed end of the second cylindrical hollow tube is provided with at least one sixth axial hole; the two end faces of the second fixed valve are respectively provided with a ninth through hole and a third ball seat hole, the ninth through hole is used for the second connecting rod to pass through, and the third ball seat hole is used for the push rod assembly to pass through; the closed end of the second movable valve is provided with a fourth ball seat hole;

[0067] The third radial hole, the fifth axial hole, the second axial hole, the third ball seat hole, the fourth ball seat hole, and the sixth axial hole form the liquid channel.

[0068] Furthermore, the push rod assembly includes a straight rod, and a first ball seat and a second ball seat respectively connected to both ends of the straight rod. The straight rod passes through the third ball seat hole, and the first ball seat and the second ball seat are located on both sides of the third ball seat hole. One end of the first connecting rod is connected to a ball claw, and the second ball seat is placed in the ball claw.

[0069] Furthermore, the second transmission assembly includes a third bevel gear and a fourth bevel gear. The third bevel gear is connected to the second connecting rod and the second fixed valve, respectively. The fourth bevel gear is connected to the second cylindrical hollow cylinder and meshes with the third bevel gear.

[0070] Furthermore, the third bevel gear is provided with a third mounting hole and a fourth mounting hole. The third mounting hole penetrates the center of the end face of the third bevel gear, and the fourth mounting hole is an eccentric hole that penetrates the end face of the third bevel gear.

[0071] The inner wall of the second fixed valve is provided with a third gear seat, the third gear seat includes a ninth boss and a fifth cylinder, the fifth cylinder is arranged radially along the second fixed valve, the third bevel gear is sleeved on the fifth cylinder, and the end face of the third bevel gear abuts against the ninth boss;

[0072] The closed end of the second cylindrical hollow cylinder is provided with a fourth gear seat. The fourth gear seat includes a second base plate and a sixth cylinder. The sixth cylinder is perpendicular to the center of the second base plate. The fourth bevel gear is sleeved on the sixth cylinder, and the end face of the fourth bevel gear abuts against the second base plate.

[0073] Furthermore, the outer wall of the fifth cylinder is provided with a third external thread, which is used to limit the movement of the third bevel gear by engaging with a bolt.

[0074] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0075] This invention proposes a downhole gas-liquid separation device. The liner can slide along the liner slideway. The length of the gas core can be adjusted by changing the position of the liner. When the gas content in the gas-liquid mixture is high, the position of the liner can be changed to increase the length of the gas core, so as to provide sufficient gas storage space and improve the gas-liquid separation efficiency. By changing the position of the liner, it can be adapted to oil wells with gas-liquid mixtures of different gas contents, and can adapt to different well conditions. Attached Figure Description

[0076] Figure 1 This is a cross-sectional view of the downhole gas-liquid separation device in an embodiment of the present invention;

[0077] Figure 2 This is an exploded view of the downhole gas-liquid separation device in an embodiment of the present invention;

[0078] Figure 3 This is a cross-sectional view of the gas-liquid separation component in an embodiment of the present invention;

[0079] Figure 4 This is a cross-sectional view of the first connecting component in an embodiment of the present invention;

[0080] Figure 5 This is a schematic diagram of the inner lining slide in an embodiment of the present invention;

[0081] Figure 6 This is a schematic diagram of the inner lining structure in an embodiment of the present invention;

[0082] Figure 7 This is a schematic diagram of the structure of the third outer cylinder in an embodiment of the present invention;

[0083] Figure 8 This is a schematic diagram of the guide cone structure in an embodiment of the present invention;

[0084] Figure 9 This is a schematic diagram of the structure of the fourth outer cylinder in an embodiment of the present invention;

[0085] Figure 10 This is a schematic diagram of the plug structure in an embodiment of the present invention;

[0086] Figure 11 This is a cross-sectional view of the plug in an embodiment of the present invention;

[0087] Figure 12 This is a schematic diagram of the structure of the liquid guiding groove seat in an embodiment of the present invention;

[0088] Figure 13 This is a cross-sectional view of the liquid guiding groove seat in an embodiment of the present invention;

[0089] Figure 14 This is a cross-sectional view of the gas reinjection assembly in an embodiment of the present invention;

[0090] Figure 15 This is a schematic diagram of the structure of the first bevel gear in an embodiment of the present invention;

[0091] Figure 16 This is a cross-sectional view of the first fixed valve in an embodiment of the present invention;

[0092] Figure 17 This is a schematic diagram of the structure of the first cylindrical hollow tube in an embodiment of the present invention;

[0093] Figure 18 This is a schematic diagram of the structure of the first movable valve in an embodiment of the present invention;

[0094] Figure 19 This is a cross-sectional view of the fluid collection assembly in an embodiment of the present invention;

[0095] Figure 20 This is a schematic diagram of the structure of the second bevel gear in an embodiment of the present invention;

[0096] Figure 21 This is a cross-sectional view of the second fixed valve in an embodiment of the present invention;

[0097] Figure 22 This is a schematic diagram of the structure of the second cylindrical hollow tube in an embodiment of the present invention;

[0098] Figure 23 This is a schematic diagram of the structure of the second movable valve in an embodiment of the present invention;

[0099] Figure 24 This is a cross-sectional view of the gas-liquid separation component in the first and third states in an embodiment of the present invention;

[0100] Figure 25 In an embodiment of the present invention, Figure 24 Enlarged view of part A in the middle;

[0101] Figure 26 In an embodiment of the present invention, Figure 24 Enlarged view of part B in the middle;

[0102] Figure 27 This is a cross-sectional view of the gas-liquid separation component in the second and fourth states in an embodiment of the present invention;

[0103] Figure 28 In an embodiment of the present invention, Figure 27 Enlarged view of a section in the middle C;

[0104] Figure 29 In an embodiment of the present invention, Figure 27 A magnified view of a section in part D;

[0105] Figure 30 This is a cross-sectional view of the first connecting pipe in an embodiment of the present invention;

[0106] Figure 31 This is a cross-sectional view of the second connecting component in an embodiment of the present invention;

[0107] Figure 32 This is a cross-sectional view of the second connecting pipe in an embodiment of the present invention.

[0108] The numbers in the attached diagram are as follows:

[0109] 00-Casing, 100-Oil-Casing Annulus, 200-First Liquid Annulus, 300-Second Liquid Annulus, 400-Gas Annulus, 500-First Isolator, 600-Second Isolator, 700-Third Isolator, 800-Fourth Isolator;

[0110] 1-Gas-liquid separation component, 4-First connecting component, 401-Cylindrical protrusion, 402-Third through hole, 403-First radial hole, 404-First internal thread, 405-Second through hole, 406-First annular protrusion, 407-Second axial hole, 5-Inner liner slide, 501-First external thread, 502-Cylindrical slide, 503-First boss, 504-Vent hole, 6-Inner liner, 61-Straight tube, 62-Conical tube, 601-Second internal thread, 602-Serrated slot, 603-Liquid-throwing through hole, 604-Helical flow channel, 7-Third outer cylinder, 701-Third internal thread, 8-Guide cone, 801-Fourth external thread, 802-Cylindrical part, 803-Conical part, 9-Fourth outer cylinder, 9 01-Large diameter end, 902-Fourth internal thread, 903-Reducing cylinder, 904-Fifth external thread, 10-Plug, 101-First countersunk hole, 102-First round tube, 103-First cylinder, 104-Frustum, 105-First through hole, 106-End face of first cylinder, 11-Liquid guiding groove seat, 111-First groove, 112-Liquid guiding through hole, 113-First stepped boss, 1131-Second boss, 1132-Third boss, 1133-Second countersunk hole, 114-Sixth external thread, 115-Seventh external thread, 116-Fifth internal thread, 117-Second round tube, 118-Second cylinder; 28-First outer cylinder, 29-Second outer cylinder, 30-Base, 31-Reset unit;

[0111] 2-Gas reinjection assembly, 12-First bevel gear, 121-Second mounting hole, 122-First mounting hole, 13-First fixed valve, 131-Fifth through hole, 132-Third annular protrusion, 133-First gear seat, 1331-Sixth boss, 1332-Third cylinder, 1333-Second external thread, 134-Fourth boss, 135-Fifth boss, 136-Second sliding groove, 137-Second annular protrusion, 138-First ball seat hole, 139-Sixth through hole, 14-First cylindrical hollow cylinder, 141-First arc-shaped groove, 142-First annular groove, 143-Second gear seat, 144-Third axial hole, 15-First movable valve, 151-First strip-shaped protrusion, 152-Fourth through hole, 153-Second ball seat hole;

[0112] 3-Sampling assembly, 16-Third bevel gear, 161-Fourth mounting hole, 162-Third mounting hole, 17-Second fixed valve, 171-Ninth through hole, 173-Third gear seat, 1731-Ninth boss, 1732-Fifth cylinder, 1733-Third external thread, 174-Seventh boss, 175-Eighth boss, 176-Third groove, 177-Fifth annular protrusion, 178-Third ball seat hole, 179-Eleventh through hole, 18-Second hollow cylindrical tube, 181-Second arc-shaped groove, 182-Second annular groove, 183-Fourth gear seat, 184-Sixth axial hole, 19-Second movable valve, 191-Second strip-shaped protrusion, 192-Tenth through hole 193-Fourth ball seat hole, 20-Second bevel gear, 21-Fourth bevel gear, 22-First connecting pipe, 221-First annular groove, 222-Second annular groove, 23-Second connecting component, 231-Fourth axial hole, 2311-Seventh through hole, 2312-Eighth through hole, 232-Second radial hole, 233-Fifth axial hole, 234-Fourth annular protrusion, 24-Second connecting pipe, 241-Third round tube, 242-Fourth round tube, 243-Third radial hole, 244-Sixth annular protrusion, 25-First connecting rod, 251-Ball claw, 26-Push rod assembly, 261-Straight rod, 262-First ball seat, 263-Second ball seat, 27-Second connecting rod. Detailed Implementation

[0113] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0114] This invention provides a downhole gas-liquid separation device, referring to... Figures 1-32 As shown, it includes a gas-liquid separation component 1, a gas reinjection component 2, a connection component, and a liquid sampling component 3;

[0115] The gas-liquid separation assembly 1 includes a first connecting component 4 and a hydrocyclone; the hydrocyclone includes an inner liner slide 5, an inner liner 6, and a separation chamber, the inner liner slide 5 is connected to the first connecting component 4, the inner liner 6 is located between the first connecting component 4 and the inner liner slide 5, and the inner liner 6 can slide along the inner liner slide 5; the separation chamber is connected to the first connecting component 4, the first connecting component 4 is used to transport the gas-liquid mixture to the separation chamber, and the separation chamber is used to separate the gas-liquid mixture.

[0116] The first connecting component 4 connects the gas reinjection component 2 and the connecting component, respectively. The connecting component is connected to the gas reinjection component 2 and the liquid collection component 3, respectively. The first connecting component 4 and the gas reinjection component 2 form a first gas channel, and the gas reinjection component 2 and the connecting component form a second gas channel. The first connecting component 4, the connecting component, and the liquid collection component 3 form a liquid channel.

[0117] The liquid sampling assembly 3 is used to connect to an external lifting device to draw the liquid separated in the separation chamber through the liquid channel under the drive of the lifting device.

[0118] The gas reinjection assembly 2 is connected to the liquid collection assembly 3 and is used to draw the gas separated in the separation chamber through the first gas channel under the drive of the liquid collection assembly 3, and discharge the separated gas through the second gas channel.

[0119] In this embodiment, the downhole gas-liquid separator is placed in the casing 00, and an annulus 100 is formed between the casing 00 and the downhole gas-liquid separator. The gas-liquid mixture enters the separation chamber from the annulus 100 through the first connecting component 4. The separation chamber separates the gas-liquid mixture. Under the drive of the lifting device, the liquid production assembly 3 draws the liquid separated in the separation chamber through the liquid channel. Under the drive of the liquid production assembly 3, the gas reinjection assembly 2 draws the gas separated in the separation chamber through the first gas channel and discharges the separated gas through the second gas channel.

[0120] This invention provides a downhole gas-liquid separation device. The inner liner 6 can slide along the inner liner slide 5. The length of the gas core can be adjusted by changing the position of the inner liner 6. When the gas content in the gas-liquid mixture is high, the position of the inner liner 6 is changed to increase the length of the gas core, so as to provide sufficient gas storage space and improve the gas-liquid separation efficiency. By changing the position of the inner liner 6, it can be adapted to oil wells with gas-liquid mixtures of different gas contents, and can adapt to different well conditions.

[0121] In one specific embodiment, refer to Figure 3 and Figure 5As shown, the inner lining slide 6 includes a first boss 503 and a cylindrical slide 502 connected to each other. The end of the cylindrical slide 502 away from the first boss 503 is connected to the first communicating component 4. The inner lining slide 6 is provided with a vent 504 that passes through the first boss 503 and the cylindrical slide 502. The vent 504 connects the separation chamber and the first gas channel. The cyclone separator also includes a reset unit 31. The reset unit 31 includes a first spring and an annular plate connected to one end of the first spring. The annular plate is connected to the inner lining 6. The first spring is located between the cylindrical slide 502 and the inner lining 6. The end of the first spring away from the annular plate abuts against the first boss 503.

[0122] The first spring has the following two states: In the first state, the first spring is in a relaxed state, such as... Figure 24 and Figure 25 As shown; in the second state, the first spring is in a compressed state, as... Figure 27 and Figure 28 As shown;

[0123] When the downhole gas-liquid separator is in use, if the gas content of the downhole gas-liquid mixture exceeds a first preset threshold, the liner 6 slides down along the cylindrical slide 502 under the pressure of the gas, lengthening the gas core, and the first spring switches from the first state to the second state.

[0124] In this embodiment, the annular plate is provided with a tenth external thread (not shown in the figure), and the inner liner is provided with a second internal thread 601. The tenth external thread is connected to the second internal thread 601, so that the inner liner is connected to the reset unit 31. When the gas content of the downhole gas-liquid mixture exceeds a first preset threshold, that is, when the gas pressure on the inner liner 6 is greater than the elastic force of the first spring, the inner liner 6 slides down along the cylindrical slide 502 under the pressure of the gas, lengthening the gas core and causing the first spring to switch from a relaxed state to a compressed state. The inner liner 6 slides along the cylindrical slide 502 to adapt to changes in the gas content of the downhole gas-liquid mixture, thereby achieving efficient separation of gas and liquid and discharging the gas.

[0125] In one specific embodiment, such as Figure 6 As shown, the inner liner 6 includes a straight tube 61 and a conical tube 62 that are interconnected and coaxial. The straight tube 61 is connected to the annular plate. The conical tube 62 has a serrated slot 602 at one end away from the straight tube 61. The outer wall of the conical tube 62 is provided with a spiral flow channel 604 that extends to the serrated slot 602. The spiral flow channel 604 is provided with a liquid-throwing through hole 603 that penetrates the outer wall and side wall of the spiral flow channel 604.

[0126] In this embodiment, the spiral channel 604 is used to generate a swirling flow of the gas-liquid mixture entering the separation chamber, thereby creating centrifugal force, which gathers the gas at the center of the separation chamber and the liquid near the side wall of the separation chamber. The serrated slot 602 acts as a guide, making it easier for the liquid to gather at the lower end of the serrated slot 602. Due to gravity, the liquid sinks and gathers along the side wall of the hydrocyclone. Through the liquid-throwing through hole 603, a small portion of the liquid gathered on the spiral channel 604 can be thrown onto the side wall of the hydrocyclone, which can fully separate the gas and liquid and improve the efficiency of gas-liquid separation.

[0127] In one specific embodiment, such as Figure 3 As shown, the hydrocyclone also includes a first outer cylinder 28, a second outer cylinder 29 and a base 30, as well as a guide cone 8, a plug 10, a liquid guiding slide seat 11, a third outer cylinder 7 and a fourth outer cylinder 9 disposed in the second outer cylinder 29;

[0128] The second outer cylinder 29 is placed inside the first outer cylinder 28 and is connected to the fourth outer cylinder 9;

[0129] The base 30 is connected to the first outer cylinder 28, and a liquid storage annulus is formed between the base 30, the first outer cylinder 28, and the second outer cylinder 29. The liquid storage annulus is connected to the first connecting component 4.

[0130] The third outer cylinder 7 and the fourth outer cylinder 9 are funnel-shaped, with the large-diameter end of the third outer cylinder 7 connected to the first connecting component 4; the middle part of the fourth outer cylinder 9 is a variable-diameter cylinder 903;

[0131] The small-diameter end of the fourth outer cylinder 9 is connected to the small-diameter end of the third outer cylinder 7. The small-diameter end of the third outer cylinder 7 is provided with a third internal thread 701, and the small-diameter end of the fourth outer cylinder 9 is provided with a fifth external thread 904. The third internal thread 701 and the fifth external thread 904 are connected to realize the connection between the fourth outer cylinder 9 and the third outer cylinder 7.

[0132] The plug 10 is slidably connected to the liquid guiding slide seat 11, and the plug 10 can move along the liquid guiding slide seat 11. The plug 10 is provided with a first through hole 105 that allows the guide cone 8 to pass through. The plug 10 is placed in the fourth outer cylinder 9.

[0133] The liquid guiding groove seat 11 is connected to the guide cone 8 and the base 30 respectively. The liquid guiding groove seat 11 is provided with a liquid guiding through hole 112, which is connected to the separation chamber and the liquid storage annulus respectively.

[0134] In this embodiment, the separated gas enters the first gas channel through the vent 504, and the separated liquid enters the first connecting component 4 through the liquid guiding hole 112 and the liquid storage annulus. By adjusting the gap between the plug 10 and the fourth outer cylinder 9, the flow rate of the liquid entering the liquid storage annulus can be adjusted, thereby controlling the efficiency of gas-liquid separation.

[0135] In one specific embodiment, refer to Figures 5-13 As shown, the hydrocyclone also includes a second spring and at least one sliding pin; the plug 10 includes a frustum 104, a first cylinder 103 and a first circular tube 102, the frustum 104 and the first circular tube 102 being disposed at both ends of the first cylinder 103;

[0136] The smaller diameter end of the frustum 104 is close to the smaller diameter end of the fourth outer cylinder 9, and the chamber formed by the frustum 104, the third outer cylinder 7 and the fourth outer cylinder 9 forms the separation chamber;

[0137] The end face 106 of the first cylinder is used to limit the second spring, and the first through hole 105 passes through the frustum 104 and the first cylinder 103.

[0138] The first circular tube 102 is provided with at least one radial first countersunk hole 101 at one end away from the first cylinder 103, and the liquid guiding slide seat 11 is provided with at least one axial first slide groove 111. The sliding pin is placed in the first countersunk hole 101 and the first slide groove 111 so that the first circular tube 102 can move along the first slide groove 111.

[0139] The second spring is sleeved on the liquid guiding groove seat 11 and positioned between the first circular tube 102 and the liquid guiding groove seat 11. The second spring has the following two states: In the third state, the second spring is in a relaxed state, such as... Figure 24 and Figure 26 As shown; in the fourth state, the second spring is in a compressed state, as... Figure 27 and Figure 29 As shown;

[0140] When the downhole gas-liquid separator is in use, if the volume of liquid in the separation chamber exceeds the second preset threshold, the first circular tube 102 slides down along the first chute 111 under the pressure of the liquid, increasing the flow rate of the separated liquid out of the separation chamber, and the second spring switches from the third state to the fourth state.

[0141] In this embodiment, when the liquid volume in the separation chamber exceeds the second preset threshold, that is, when the pressure of the liquid on the plug 10 is greater than the elastic force of the second spring, the first circular tube 102 slides down along the first slide groove 111 under the pressure of the liquid, increasing the flow rate of the separated liquid out of the separation chamber. The second spring switches from a relaxed state to a compressed state. By sliding the first circular tube 102 along the first slide groove 111, the gap between the plug 10 and the fourth outer cylinder 9 is adjusted, thereby adjusting the flow rate of the liquid entering the liquid storage annulus, adjusting the efficiency of liquid extraction, and thus adjusting the efficiency of gas-liquid separation.

[0142] In one specific embodiment, such as Figure 12 and Figure 13 As shown, the liquid guiding groove seat 11 includes a first stepped boss 113 and a second circular tube 117. The first stepped boss 113 includes a second boss 1131 and a third boss 1132. The third boss 1132 and the second circular tube 117 are respectively located at both ends of the second boss 1131. The liquid guiding through hole 112 is provided on the first stepped boss 113 and passes through the second boss 1131 and the third boss 1132. The first groove 111 is provided on the outer wall of the second circular tube 117. The second boss 1131 has a second countersunk hole 1133 at its center. The second countersunk hole 1133 is threadedly connected to the guide cone 8. The outer wall of the second boss 1131 is threadedly connected to the fourth outer cylinder 9. The center of the third boss 1132 is connected to a second cylinder 118, which is connected to the base 30.

[0143] In this embodiment, the second boss 1131 has a second countersunk hole 1133 at its center, and the inner wall of the second countersunk hole 1133 has a fifth internal thread 116. The guide cone 8 includes a cylindrical part 802 and a conical part 803, with the conical part 803 facing the separation cavity. The end of the cylindrical part 802 away from the conical part has a fourth external thread 801, which is connected to the fourth external thread 801 through the fifth internal thread 116, thus connecting the second countersunk hole 1133 to the guide cone 8. The second boss 1131 has a sixth external thread 114, and the fourth outer cylinder... The large-diameter end 901 of the 9 is provided with a fourth internal thread 902, which is connected to the fourth internal thread 902 through a sixth external thread 114, thereby connecting the outer wall of the second boss 1131 with the fourth outer cylinder 9; the second cylinder 118 is provided with a seventh external thread 115, and the base 30 is provided with an eleventh internal thread (not shown in the drawing). The connection between the seventh external thread 115 and the eleventh internal thread is achieved, thereby connecting the liquid guide slide seat 11 with the fourth outer cylinder 9 and the base 30.

[0144] In one specific embodiment, such as Figure 4As shown, the first connecting component 4 has a first axial hole through its center. The first axial hole connects to the gas reinjection component 2 and forms the first gas channel. The sidewall of the first axial hole has at least one first radial hole 403 and at least one second axial hole 407. The first radial hole 403 is used to transport the gas-liquid mixture to the separation chamber. The second axial hole 407 connects to the connecting component and forms the liquid channel with the connecting component and the liquid sampling component 3.

[0145] In this embodiment, the outer walls of the first connecting component 4 are respectively connected to a first isolator 500 and a second isolator 600. The first isolator 500 is used to separate the separated gas from the gas-liquid mixture to prevent the separated gas from mixing with the gas-liquid mixture in the oil sleeve annulus 100 through the first radial hole 403. The annular cavity formed by the second isolator 600, the gas reinjection component 2, and the inner wall of the sleeve 00 forms a first liquid annulus 200. The gas reinjection component 2 is connected through the first axial hole to form the first gas channel. The gas-liquid mixture is transported to the separation chamber through the first radial hole 403. The connecting component is connected through the second axial hole 407 and forms the liquid channel with the connecting component and the liquid sampling component 3. The liquid enters the connecting component and the liquid sampling component 3 sequentially from the second axial hole 407 through the first liquid annulus 200.

[0146] In a further specific embodiment, such as Figure 4 As shown, the first axial hole is a stepped through hole, which includes a second through hole 405 and a third through hole 402; the inner wall of the second through hole 405 is provided with a first internal thread 404, and the end of the cylindrical slide 502 away from the first boss 503 is provided with a first external thread 501. The cylindrical slide 502 and the second through hole 405 are assembled as one unit, and the first internal thread 404 and the first external thread 501 are engaged; the end of the first connecting component 4 near the third through hole 402 is provided with a cylindrical protrusion 401, and the large-diameter end of the third outer cylinder 7 is cylindrical. The third outer cylinder 7 and the third through hole 402 are assembled as one unit, and the cylindrical protrusion 401 is engaged with the large-diameter end of the third outer cylinder 7.

[0147] In this embodiment, the cylindrical slide 502 is connected to the second through hole 405 by a thread, and the cylindrical protrusion 401 is engaged with the large diameter end of the third outer cylinder 7 to realize the connection between the third outer cylinder 7 and the first connecting component 4.

[0148] In one specific embodiment, such as Figure 1 , Figure 2 , Figure 4 and Figure 30As shown, the downhole gas-liquid separation device further includes a first connecting rod 25 and a first connecting pipe 22. The first connecting rod 25 passes through the first connecting pipe 22 and is connected to the gas reinjection assembly 2 and the liquid production assembly 3, respectively. The first connecting component 4 is provided with a first annular protrusion 406 at one end near the second through hole 405. The first connecting pipe 22 is provided with a first annular groove 221 that matches the first annular protrusion 406 at one end, and the other end is connected to the gas reinjection assembly 2.

[0149] In this embodiment, the gas reinjection assembly 2 and the liquid sampling assembly 3 are connected by a first connecting rod 25. The liquid sampling assembly 3 moves under the drive of the lifting device. The gas reinjection assembly 2 is driven by the liquid sampling assembly 3 through the first connecting rod 25, thereby drawing the gas separated in the separation chamber through the first gas channel and discharging the separated gas through the second gas channel. The first connecting pipe 22 connects the first connecting component 4 and the gas reinjection assembly 2, and is used to separate the separated gas and liquid. The gas enters the first gas channel from inside the first connecting pipe 22, and the liquid is isolated from the outside of the first connecting pipe 22.

[0150] In one specific embodiment, refer to Figure 14-18 As shown, the gas reinjection assembly 2 includes a first transmission assembly, a first fixed valve 13, a first cylindrical hollow cylinder 14, a first movable valve 15, and at least one second pin.

[0151] The first transmission assembly is connected to the first connecting rod 25 and the first cylindrical hollow cylinder 14 respectively, and is used to convert the linear motion of the first connecting rod 25 into the rotational motion of the first cylindrical hollow cylinder 14.

[0152] In one specific embodiment, such as Figure 14 As shown, the first transmission assembly includes a first bevel gear 12 and a second bevel gear 20. The first bevel gear 12 is connected to the first connecting rod 25 and the first fixed valve 13, respectively. The second bevel gear 20 is connected to the cylindrical hollow cylinder and meshes with the first bevel gear 12.

[0153] The first cylindrical hollow cylinder 14 is rotatably connected to the first fixed valve 13, and the outer wall of the first cylindrical hollow cylinder 14 is provided with a first arc-shaped groove 141; one end of the first cylindrical hollow cylinder 14 is open and the other end is closed.

[0154] The first fixed valve 13 is a hollow cylinder, and the inner wall of the first fixed valve 13 is provided with at least one second sliding groove 136 along the axial direction; the first fixed valve 13 is provided with a second annular protrusion 137 at one end near the first ball seat hole 138, and the other end of the first connecting pipe 22 is provided with a second annular groove 222 that matches the second annular protrusion 137.

[0155] The first movable valve 15 is cylindrical, with one end closed and the other end open. The open end of the first movable valve 15 faces the open end of the first cylindrical hollow cylinder 14. The side wall of the first movable valve 15 is provided with at least one fourth through hole 152. The outer wall of the first movable valve 15 is provided with at least one first strip-shaped protrusion 151 that matches the second sliding groove 136.

[0156] The second pin is placed in the fourth through hole 152 and the first arc-shaped groove 141.

[0157] In this embodiment, the first bevel gear 12 is driven to rotate by the first connecting rod 25, thereby driving the second bevel gear 20 to rotate. The second bevel gear 20 is connected to the first cylindrical hollow cylinder 14, so the first cylindrical hollow cylinder 14 and the second bevel gear 20 rotate coaxially. The first cylindrical hollow cylinder 14 is rotatably connected to the first fixed valve 13. The first cylindrical hollow cylinder 14 and the first movable valve 15 are connected by a second pin placed in the fourth through hole 152 and the first arc-shaped groove 141. During the rotation of the first cylindrical hollow cylinder 14, the first movable valve 15 is driven to move axially along the second sliding groove 136 on the inner wall of the first fixed valve 13, realizing the low-frequency to high-frequency motion. When the first movable valve 15 moves upward, it draws the gas separated in the separation chamber. When the first movable valve 15 moves downward, it compresses the gas and discharges the separated gas through the second gas channel.

[0158] In one specific embodiment, the closed end of the first cylindrical hollow tube 14 is provided with at least one third axial hole 144; the two end faces of the first fixed valve 13 are respectively provided with a fifth through hole 131 and a first ball seat hole 138, the fifth through hole 131 is used for the first connecting rod 25 to pass through, and the first ball seat hole 138 communicates with the second through hole 405; the closed end of the first movable valve 15 is provided with a second ball seat hole 153; the second through hole 405, the first ball seat hole 138 and the second ball seat hole 153 form the first gas channel, and the third axial hole 144, the fifth through hole 131 and the connecting assembly form the second gas channel.

[0159] In one specific embodiment, such as Figure 16As shown, the downhole gas-liquid separation device further includes at least one third pin; a second stepped protrusion is provided in the middle of the inner wall of the first fixed valve 13, the second stepped protrusion including a fourth protrusion 134 and a fifth protrusion 135; the protrusion height of the fourth protrusion 134 is greater than that of the fifth protrusion 135, and the end face of the fourth protrusion 134 is used to limit the first movable valve 15; the end face of the fifth protrusion 135 abuts against the first cylindrical hollow cylinder 14, and the fifth protrusion 135 is provided with at least one radially arranged sixth through hole 139; the outer wall of the first cylindrical hollow cylinder 14 is provided with a first annular groove 142, and the third pin is placed in the sixth through hole 139 and the first annular groove 142.

[0160] In this embodiment, the third pin is placed in the sixth through hole 139 and the first annular groove 142, so that the first cylindrical hollow cylinder 14 is rotatably connected to the first fixed valve 13, and the first cylindrical hollow cylinder 14 is restricted to rotating only along the first annular groove 142.

[0161] Of course, the connection method between the first cylindrical hollow cylinder 14 and the first fixed valve 13 is not limited to the method in this embodiment. As long as the first cylindrical hollow cylinder 14 and the first fixed valve 13 can be rotatably connected, it is acceptable.

[0162] In one specific embodiment, such as Figure 15 , Figure 16 and Figure 17 As shown, the first bevel gear 12 is provided with a first mounting hole 122 and a second mounting hole 121. The first mounting hole 122 passes through the center of the end face of the first bevel gear 12, and the second mounting hole 121 is an eccentric hole that passes through the end face of the first bevel gear 12.

[0163] The inner wall of the first fixed valve 13 is provided with a first gear seat 133. The first gear seat 133 includes a sixth boss 1331 and a third cylinder 1332. The third cylinder 1332 is arranged radially along the first fixed valve 13. The first bevel gear 12 is sleeved on the third cylinder 1332, and the end face of the first bevel gear 12 abuts against the sixth boss 1331.

[0164] The closed end of the first cylindrical hollow cylinder 14 is provided with a second gear seat 143. The second gear seat 143 includes a first base plate and a fourth cylinder. The fourth cylinder is perpendicular to the center of the first base plate. The second bevel gear 20 is sleeved on the fourth cylinder, and the end face of the second bevel gear 20 abuts against the first base plate.

[0165] In this embodiment, the third cylinder 1332 is arranged radially along the first fixed valve 13, the first bevel gear 12 is sleeved on the third cylinder 1332, the fourth cylinder is perpendicular to the center of the first base plate, and the second bevel gear 20 is sleeved on the fourth cylinder, so that the first bevel gear 12 and the second bevel gear 20 mesh, the first bevel gear 12 drives the second bevel gear 20 to rotate, and the second bevel gear 20 and the first cylindrical hollow cylinder 14 move coaxially.

[0166] In a further embodiment, such as Figure 16 As shown, the outer wall of the third cylinder 1332 is provided with a second external thread 1333. A bolt (not shown in the figure) engages with the second external thread 1333 to limit the movement of the first bevel gear 12. By providing the second external thread 1333 on the outer wall of the third cylinder 1332 and using a bolt to engage with the second external thread 1333, the first bevel gear 12 is prevented from moving along the third cylinder 1332 during operation. This prevents transmission failure caused by the first bevel gear 12 disengaging from the second bevel gear 20, thus improving the stability and reliability of the device.

[0167] In one specific embodiment, such as Figure 1 , Figure 2 , Figure 31 and Figure 32 As shown, it also includes a second connecting rod 27, and the connecting assembly includes a second communicating component 23 and a second connecting pipe 24;

[0168] The second connecting rod 27 is connected to the lifting device and the liquid collection assembly 3 respectively;

[0169] The center of the second connecting component 23 is provided with a fourth axial hole 231. The sidewall of the fourth axial hole 231 is provided with at least one second radial hole 232 and at least one fifth axial hole 233. The second radial hole 232, the third axial hole 144 and the fifth through hole 131 form the second gas channel. The fifth axial hole 233 connects the second axial hole 407 and the second connecting pipe 24.

[0170] The two ends of the second connecting pipe 24 are respectively connected to the second communicating component 23 and the liquid collection component 3. The second connecting pipe 24 is provided with at least one third radial hole 243. The third radial hole 243, the fifth axial hole 233, the second axial hole 407 and the liquid collection component 3 form the liquid channel.

[0171] In this embodiment, the second radial hole 232, the third axial hole 144, and the fifth through hole 131 form the second gas channel, discharging gas to the gas annulus 400400. The outer walls of the second connecting member 23 are respectively connected to a third isolator 700 and a fourth isolator 800. The gas annulus 400400 is an annular cavity formed by the third isolator 700, the fourth isolator 800, the outer wall of the second connecting member 23, and the inner wall of the casing 00. The annular cavity formed by the fourth isolator 800, the liquid sampling assembly 3, and the inner wall of the casing 00 is... The second liquid annulus 300; the third radial hole 243, the fifth axial hole 233, the second axial hole 407 and the liquid collection assembly 3 form the liquid channel, which transports the liquid to the liquid collection assembly 3. After entering the second liquid annulus 300 through the fifth axial hole 233, the liquid enters the liquid collection assembly 3 through the third radial hole 243. It is connected to the lifting device and the liquid collection assembly 3 through the second connecting rod 27. The liquid collection assembly 3 is driven by the lifting device through the second connecting rod 27 and draws the liquid separated in the separation chamber through the liquid channel.

[0172] In a further embodiment, combined with Figure 16 , Figure 31 and Figure 32 As shown, the fourth axial hole 231 is a stepped through hole, which includes a seventh through hole 2311 and an eighth through hole 2312; the first fixing valve 13 has a third annular protrusion 132 at one end near the fifth through hole 131, and the second connecting component 23 has a fourth annular protrusion 234 at one end near the eighth through hole 2312, the fourth annular protrusion 234 being connected to the third annular protrusion 132; the second connecting pipe 24 is a stepped pipe, the second The connecting pipe 24 includes a third circular pipe 241 and a fourth circular pipe 242. The third circular pipe 241 is placed in the seventh through hole 2311, and the outer wall of the third circular pipe 241 is attached to the inner wall of the seventh through hole 2311. The third radial hole 243 is provided on the fourth circular pipe 242. The end face of the fourth circular pipe 242 near the end of the third circular pipe 241 abuts against the end face of the seventh through hole 2311. The second connecting rod 27 is attached to the inner wall of the third circular pipe 241.

[0173] In this embodiment, the fourth annular protrusion 234 is connected to the third annular protrusion 132 to connect the second communicating component 23 to the first fixed valve 13; the third circular tube 241 is placed in the seventh through hole 2311, and the outer wall of the third circular tube 241 is attached to the inner wall of the seventh through hole 2311; the end face of the fourth circular tube 242 near the end of the third circular tube 241 abuts against the end face of the seventh through hole 2311; the second connecting rod 27 is attached to the inner wall of the third circular tube 241 to connect the second connecting tube 24 to the second connecting component, and also to seal the inner hole of the second connecting tube 24, preventing gas from entering the liquid sampling assembly 3 from the second gas channel.

[0174] In one specific embodiment, such as Figure 1 , Figure 2 and Figure 19-23 As shown, the liquid collection assembly 3 includes a push rod assembly 26, a second transmission assembly, a second fixed valve 17, a second cylindrical hollow cylinder 18, a second movable valve 19, and at least one fourth pin.

[0175] The second transmission assembly is connected to the second connecting rod 27 and the second cylindrical hollow cylinder 18 respectively, and is used to convert the linear motion of the second connecting rod 27 into the rotational motion of the second cylindrical hollow cylinder 18.

[0176] In one specific embodiment, the second transmission component includes a third bevel gear 16 and a fourth bevel gear 21. The third bevel gear 16 is connected to the second connecting rod 27 and the second fixed valve 17, respectively. The fourth bevel gear 21 is connected to the second cylindrical hollow cylinder 18 and meshes with the third bevel gear 16.

[0177] The second cylindrical hollow cylinder 18 is rotatably connected to the second fixed valve 17, and the outer wall of the second cylindrical hollow cylinder 18 is provided with a second arc-shaped groove 181; one end of the second cylindrical hollow cylinder 18 is open and the other end is closed.

[0178] The second fixed valve 17 is a hollow cylinder, and the inner wall of the second fixed valve 17 is provided with at least one third sliding groove 176 along the axial direction; the second fixed valve 17 is provided with a fifth annular protrusion 177 at one end near the third ball seat hole 178, and the end face of the fourth round tube 242 away from the third round tube 241 is provided with a sixth annular protrusion 244, and the sixth annular protrusion 244 is connected to the fifth annular protrusion 177.

[0179] The second movable valve 19 is cylindrical, with one end closed and the other end open, the open end of the second movable valve 19 facing the open end of the second cylindrical hollow cylinder 18; the outer wall of the second movable valve 19 is provided with at least one second strip-shaped protrusion 191 that matches the third sliding groove 176; at least one tenth through hole 192 is provided on the side wall of the second movable valve 19.

[0180] The fourth pin is placed in the tenth through hole 192 and the second arc-shaped groove 181.

[0181] The push rod assembly 26 passes through the second movable valve 19 and is connected to the second connecting rod 27.

[0182] In this embodiment, the third bevel gear 16 is driven to rotate by the second connecting rod 27, thereby driving the fourth bevel gear 21 to rotate. The fourth bevel gear 21 is connected to the second cylindrical hollow cylinder 18, so the second cylindrical hollow cylinder 18 and the fourth bevel gear 21 rotate coaxially. The second cylindrical hollow cylinder 18 is rotatably connected to the second fixed valve 17. The second cylindrical hollow cylinder 18 and the second movable valve 19 are connected by the fourth pin placed in the tenth through hole 192 and the second arc-shaped groove 181. During the rotation of the second cylindrical hollow cylinder 18, the second movable valve 19 is driven to move axially along the third sliding groove 176 on the inner wall of the second fixed valve 17, realizing the low-frequency to high-frequency motion. When the second movable valve 19 moves upward, it draws the liquid separated in the separation chamber through the liquid channel.

[0183] In one specific embodiment, such as Figure 21 and Figure 23 As shown, the downhole gas-liquid separation device further includes at least one fifth pin; a third stepped protrusion is provided in the middle of the inner wall of the second fixed valve 17, the third stepped protrusion including a seventh protrusion 174 and an eighth protrusion 175; the protrusion height of the seventh protrusion 174 is greater than that of the eighth protrusion 175, and the end face of the seventh protrusion 174 is used to limit the second movable valve 19; the end face of the eighth protrusion 175 abuts against the second cylindrical hollow cylinder 18, and the eighth protrusion 175 is provided with at least one radially eleventh through hole 179; the outer wall of the second movable valve 19 is provided with a second annular groove 182, and the fifth pin is placed in the eleventh through hole 179 and the second annular groove 182.

[0184] In this embodiment, the fifth pin is placed in the eleventh through hole 179 and the second annular groove 182, so that the second cylindrical hollow cylinder 18 is rotatably connected to the second fixed valve, and the second cylindrical hollow cylinder 18 can only rotate along the second annular groove 182.

[0185] Of course, the connection method between the second cylindrical hollow cylinder 18 and the second fixed valve 17 is not limited to the method in this embodiment. As long as the second cylindrical hollow cylinder 18 and the second fixed valve 17 can be rotatably connected, it is acceptable.

[0186] In one specific embodiment, such as Figure 21 , Figure 22 and Figure 23 As shown, the closed end of the second cylindrical hollow tube 18 is provided with at least one sixth axial hole 184; the two end faces of the second fixed valve 17 are respectively provided with a ninth through hole 171 and a third ball seat hole 178, the ninth through hole 171 is used for the second connecting rod 27 to pass through, and the third ball seat hole 178 is used for the push rod assembly 26 to pass through; the closed end of the second movable valve 19 is provided with a fourth ball seat hole 193;

[0187] The third radial hole 243, the fifth axial hole 233, the second axial hole 407, the third ball seat hole 178, the fourth ball seat hole 193, and the sixth axial hole 184 form the liquid channel.

[0188] In one specific embodiment, such as Figure 2 As shown, the push rod assembly 26 includes a straight rod 261, and a first ball seat 262 and a second ball seat 263 connected to both ends of the straight rod 261, respectively. The straight rod 261 passes through the third ball seat hole 178, and the first ball seat 262 and the second ball seat 263 are located on both sides of the third ball seat hole 178, respectively. One end of the first connecting rod 25 is connected to a ball claw 251, and the second ball seat 263 is placed in the ball claw 251.

[0189] In this embodiment, the first ball seat 262 and the second ball seat 263 are respectively located on both sides of the third ball seat hole 178, and the second ball seat 263 is placed in the ball claw 251, thereby connecting the push rod assembly with the first connecting rod 25. When the second moving valve 19 moves upward, it draws the liquid separated in the separation chamber through the liquid channel, while simultaneously driving the push rod assembly to move upward; when the second moving valve 19 moves downward, it compresses the fluid, while simultaneously driving the push rod assembly to move downward, thereby realizing the linkage between the liquid sampling assembly 3 and the gas reinjection assembly 2.

[0190] In one specific embodiment, such as Figure 20 , Figure 21 and Figure 22 As shown, the third bevel gear 16 is provided with a third mounting hole 162 and a fourth mounting hole 161. The third mounting hole 162 passes through the center of the end face of the third bevel gear 16, and the fourth mounting hole 161 is an eccentric hole that passes through the end face of the third bevel gear.

[0191] The inner wall of the second fixed valve 17 is provided with a third gear seat 173. The third gear seat 173 includes a ninth boss 1731 and a fifth cylinder 1732. The fifth cylinder 1732 is arranged radially along the second fixed valve 17. The third bevel gear 16 is sleeved on the fifth cylinder 1732, and the end face of the third bevel gear 16 abuts against the ninth boss 1731.

[0192] The closed end of the second cylindrical hollow cylinder 18 is provided with a fourth gear seat 183. The fourth gear seat 183 includes a second base plate and a sixth cylinder. The sixth cylinder is perpendicular to the center of the second base plate. The fourth bevel gear 21 is sleeved on the sixth cylinder, and the end face of the fourth bevel gear 21 abuts against the second base plate.

[0193] In this embodiment, the fifth cylinder 1732 is arranged radially along the second fixed valve 17, the third bevel gear 16 is sleeved on the fifth cylinder 1732, the sixth cylinder is perpendicular to the center of the second base plate, and the fourth bevel gear 21 is sleeved on the sixth cylinder, so that the third bevel gear 16 and the fourth bevel gear 21 mesh, the third bevel gear 16 drives the fourth bevel gear 21 to rotate, and the fourth bevel gear 21 moves coaxially with the second cylindrical hollow cylinder 18.

[0194] In a further embodiment, such as Figure 21 As shown, the outer wall of the fifth cylinder 1732 is provided with a third external thread 1733. A bolt engages with the third external thread 1733 to limit the movement of the third bevel gear 16. By providing the third external thread 1733 on the outer wall of the fifth cylinder 1732 and engaging the bolt with the third external thread 1733, the third bevel gear 16 is prevented from moving along the fifth cylinder 1732 during operation. This prevents transmission failure caused by the third bevel gear 16 disengaging from the fourth bevel gear 21, thus improving the stability and reliability of the device.

[0195] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0196] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A downhole gas-liquid separation device, characterized in that, It includes a gas-liquid separation assembly, a gas reinjection assembly, a connection assembly, and a liquid collection assembly; The gas-liquid separation assembly includes a first connecting component and a hydrocyclone; the hydrocyclone includes an inner liner slide, an inner liner, and a separation chamber; the inner liner slide is connected to the first connecting component, the inner liner is located between the first connecting component and the inner liner slide, and the inner liner is slidable along the inner liner slide; the separation chamber is connected to the first connecting component, the first connecting component is used to transport the gas-liquid mixture to the separation chamber, and the separation chamber is used to separate the gas-liquid mixture; The first connecting component connects the gas reinjection assembly and the connecting assembly respectively, and the connecting assembly is connected to the gas reinjection assembly and the liquid collection assembly respectively; the first connecting component and the gas reinjection assembly form a first gas channel, and the gas reinjection assembly and the connecting assembly form a second gas channel; the first connecting component, the connecting assembly, and the liquid collection assembly form a liquid channel; The liquid collection assembly is used to connect to an external lifting device to draw the liquid separated in the separation chamber through the liquid channel under the drive of the lifting device. The gas reinjection assembly is connected to the liquid collection assembly and is used to draw the gas separated in the separation chamber through the first gas channel under the drive of the liquid collection assembly, and to discharge the separated gas through the second gas channel.

2. The downhole gas-liquid separation device as described in claim 1, characterized in that, The inner lining slide includes a first boss and a cylindrical slide that are connected to each other. The end of the cylindrical slide away from the first boss is connected to the first communicating component. The inner lining slide is provided with a vent hole that passes through the first boss and the cylindrical slide. The vent hole connects the separation chamber and the first gas channel. The hydrocyclone further includes a reset unit, which includes a first spring and an annular plate connected to one end of the first spring. The annular plate is connected to the inner liner. The first spring is located between the cylindrical slide and the inner liner. The end of the first spring away from the annular plate abuts against the first boss. The first spring has the following two states: in the first state, the first spring is in a relaxed state; in the second state, the first spring is in a compressed state. When the downhole gas-liquid separator is in use, if the gas content of the downhole gas-liquid mixture exceeds a first preset threshold, the liner slides down along the cylindrical slide under the pressure of the gas, lengthening the gas core, and the first spring switches from the first state to the second state.

3. The downhole gas-liquid separation device as described in claim 2, characterized in that, The liner includes a straight tube and a conical tube coaxially connected. The straight tube is connected to the annular plate. A serrated slot is provided at the end of the conical tube away from the straight tube. A spiral flow channel is provided on the outer wall of the conical tube, extending to the serrated slot. A liquid-throwing through hole is provided on the spiral flow channel, penetrating the outer wall and side wall of the spiral flow channel.

4. The downhole gas-liquid separation device as described in claim 3, characterized in that, The hydrocyclone also includes a first outer cylinder, a second outer cylinder and a base, as well as a guide cone, a plug, a liquid guiding slide seat, a third outer cylinder and a fourth outer cylinder disposed in the second outer cylinder; The second outer cylinder is placed inside the first outer cylinder and is connected to the fourth outer cylinder; The base is connected to the first outer cylinder, and a liquid storage annulus is formed between the base, the first outer cylinder, and the second outer cylinder. The liquid storage annulus is connected to the first connecting component. The third outer cylinder and the fourth outer cylinder are funnel-shaped, and the large-diameter end of the third outer cylinder is connected to the first connecting component. The small-diameter end of the fourth outer cylinder is connected to the small-diameter end of the third outer cylinder; The plug is slidably connected to the liquid guiding groove seat, and the plug can move along the liquid guiding groove seat. The plug is placed in the fourth outer cylinder, and the plug is provided with a first through hole that allows the guide cone to pass through. The liquid guiding groove seat is connected to the guide cone and the base respectively. The liquid guiding groove seat is provided with a liquid guiding through hole, which is connected to the separation chamber and the liquid storage annulus respectively.

5. The downhole gas-liquid separation device as described in claim 4, characterized in that, The hydrocyclone also includes a second spring and at least one sliding pin. The plug includes a frustum, a first cylinder, and a first circular tube, with the frustum and the first circular tube disposed at both ends of the first cylinder. The smaller diameter end of the frustum is close to the smaller diameter end of the fourth outer cylinder, and the cavity formed by the frustum, the third outer cylinder, and the fourth outer cylinder constitutes the separation cavity; The end face of the first cylinder is used to limit the second spring, and the first through hole passes through the frustum and the first cylinder; The first circular tube is provided with at least one radial first countersunk hole at the end away from the first cylinder, the liquid guiding slide seat is provided with at least one axial first slide groove, and the sliding pin is placed in the first countersunk hole and the first slide groove so that the first circular tube can move along the first slide groove. The second spring is sleeved on the liquid guiding groove seat and placed between the first circular tube and the liquid guiding groove seat. The second spring has the following two states: in the third state, the second spring is in a relaxed state; in the fourth state, the second spring is in a compressed state. When the downhole gas-liquid separator is in use, if the volume of liquid in the separation chamber exceeds a second preset threshold, the first circular tube slides down along the first groove under the pressure of the liquid, increasing the flow rate of the separated liquid out of the separation chamber, and the second spring switches from the third state to the fourth state.

6. The downhole gas-liquid separation device as described in claim 5, characterized in that, The liquid guiding groove seat includes a first stepped boss and a second circular tube. The first stepped boss includes a second boss and a third boss. The third boss and the second circular tube are located at opposite ends of the second boss. The liquid guiding through hole is provided on the first stepped boss and passes through the second boss and the third boss. The first groove is provided on the outer wall of the second circular tube. The second boss has a second countersunk hole at its center, which is threaded to the guide cone. The outer wall of the second boss is threaded to the fourth outer cylinder. The center of the third boss is connected to a second cylinder, which is connected to the base.

7. The downhole gas-liquid separation device as described in claim 6, characterized in that, The first connecting component has a first axial hole through its center. The first axial hole connects to the gas reinjection component and forms the first gas channel. The sidewall of the first axial hole has at least one first radial hole and at least one second axial hole. The first radial hole is used to transport the gas-liquid mixture to the separation chamber. The second axial hole connects to the connecting component and forms the liquid channel with the connecting component and the liquid sampling component.

8. The downhole gas-liquid separation device as described in claim 7, characterized in that, The first axial hole is a stepped through hole, which includes a second through hole and a third through hole; The inner wall of the second through hole is provided with a first internal thread, and the end of the cylindrical slide away from the first boss is provided with a first external thread. The cylindrical slide and the second through hole are assembled as one unit, and the first internal thread and the first external thread cooperate. The first connecting component has a cylindrical protrusion at one end near the third through hole. The large-diameter end of the third outer cylinder is cylindrical. The third outer cylinder and the third through hole are assembled as one unit. The cylindrical protrusion cooperates with the large-diameter end of the third outer cylinder.

9. The downhole gas-liquid separation device as described in claim 8, characterized in that, It also includes a first connecting rod and a first connecting pipe. The first connecting rod passes through the first connecting pipe and is connected to the gas reinjection assembly and the liquid collection assembly, respectively. The first connecting component is provided with a first annular protrusion at one end near the second through hole. The first connecting pipe is provided with a first annular groove matching the first annular protrusion at one end, and the other end is connected to the gas reinjection assembly.

10. The downhole gas-liquid separation device as described in claim 9, characterized in that, The gas reinjection assembly includes a first transmission assembly, a first fixed valve, a first cylindrical hollow cylinder, a first movable valve, and at least one second pin. The first transmission assembly is connected to the first connecting rod and the first cylindrical hollow cylinder respectively, and is used to convert the linear motion of the first connecting rod into the rotational motion of the first cylindrical hollow cylinder. The first cylindrical hollow tube is rotatably connected to the first fixed valve, and the outer wall of the first cylindrical hollow tube is provided with a first arc-shaped groove. The first cylindrical hollow tube is open at one end and closed at the other end; The first fixed valve is a hollow cylinder, and the inner wall of the first fixed valve is provided with at least one second sliding groove along the axial direction; the two end faces of the first fixed valve are respectively provided with a fifth through hole and a first ball seat hole, and the end of the first fixed valve near the first ball seat hole is provided with a second annular protrusion, and the other end of the first connecting pipe is provided with a second annular groove that matches the second annular protrusion. The first movable valve is cylindrical, with one end closed and the other end open. The open end of the first movable valve faces the open end of the first hollow cylindrical tube. The side wall of the first movable valve is provided with at least one fourth through hole. The outer wall of the first movable valve is provided with at least one first strip-shaped protrusion that matches the second sliding groove. The second pin is placed in the fourth through hole and the first arc-shaped groove.

11. The downhole gas-liquid separation device as described in claim 10, characterized in that, The closed end of the first cylindrical hollow tube is provided with at least one third axial hole; the fifth through hole is used for the first connecting rod to pass through, and the first ball seat hole communicates with the second through hole; the closed end of the first movable valve is provided with a second ball seat hole; The second through hole, the first ball seat hole, and the second ball seat hole form the first gas channel, and the third axial hole, the fifth through hole, and the connecting assembly form the second gas channel.

12. The downhole gas-liquid separation device as described in claim 10, characterized in that, It also includes at least one third pin; The inner wall of the first fixed valve is provided with a second stepped boss in the middle, the second stepped boss includes a fourth boss and a fifth boss; the protrusion height of the fourth boss is greater than that of the fifth boss, and the end face of the fourth boss is used to limit the first movable valve; the end face of the fifth boss abuts against the first cylindrical hollow cylinder, and the fifth boss is provided with at least one radial sixth through hole. The outer wall of the first cylindrical hollow tube is provided with a first annular groove, and the third pin is placed in the sixth through hole and the first annular groove.

13. The downhole gas-liquid separation device as described in claim 10, characterized in that, The first transmission assembly includes a first bevel gear and a second bevel gear. The first bevel gear is connected to the first connecting rod and the first fixed valve, respectively. The second bevel gear is connected to the first hollow cylindrical tube and meshes with the first bevel gear.

14. The downhole gas-liquid separation device as described in claim 13, characterized in that, The first bevel gear is provided with a first mounting hole and a second mounting hole. The first mounting hole passes through the center of the end face of the first bevel gear, and the second mounting hole is an eccentric hole that passes through the end face of the first bevel gear. The inner wall of the first fixed valve is provided with a first gear seat. The first gear seat includes a sixth boss and a third cylinder. The third cylinder is arranged radially along the first fixed valve. The first bevel gear is sleeved on the third cylinder, and the end face of the first bevel gear abuts against the sixth boss. The closed end of the first cylindrical hollow cylinder is provided with a second gear seat. The second gear seat includes a first base plate and a fourth cylinder. The fourth cylinder is perpendicular to the center of the first base plate. The second bevel gear is sleeved on the fourth cylinder, and the end face of the second bevel gear abuts against the first base plate.

15. The downhole gas-liquid separation device as described in claim 14, characterized in that, The outer wall of the third cylinder is provided with a second external thread, which is used to limit the first bevel gear by engaging with the second external thread through a bolt.

16. The downhole gas-liquid separation device as described in claim 11, characterized in that, It also includes a second link, and the connecting assembly includes a second communicating component and a second connecting pipe; The second link is connected to both the lifting device and the fluid collection assembly. The second connecting component has a fourth axial hole through its center. The sidewall of the fourth axial hole has at least one second radial hole and at least one fifth axial hole. The second radial hole, the third axial hole, and the fifth through hole form the second gas channel. The fifth axial hole connects the second axial hole and the second connecting pipe. The two ends of the second connecting pipe are respectively connected to the second communicating component and the liquid collection assembly. The second connecting pipe is provided with at least one third radial hole. The third radial hole, the fifth axial hole, the second axial hole and the liquid collection assembly form the liquid channel.

17. The downhole gas-liquid separation device as described in claim 16, characterized in that, The fourth axial hole is a stepped through hole, which includes a seventh through hole and an eighth through hole; The first fixed valve has a third annular protrusion at one end near the fifth through hole, and the second connecting component has a fourth annular protrusion at one end near the eighth through hole, and the fourth annular protrusion is connected to the third annular protrusion. The second connecting pipe is a stepped pipe, which includes a third round pipe and a fourth round pipe. The third round pipe is placed in the seventh through hole, and the outer wall of the third round pipe is attached to the inner wall of the seventh through hole. The third radial hole is provided on the fourth round pipe. The end face of the fourth round pipe near the third round pipe abuts against the end face of the seventh through hole. The second connecting rod is attached to the inner wall of the third round pipe.

18. The downhole gas-liquid separation device as described in claim 17, characterized in that, The fluid collection assembly includes a push rod assembly, a second transmission assembly, a second fixed valve, a second cylindrical hollow cylinder, a second movable valve, and at least one fourth pin. The second transmission assembly is connected to the second connecting rod and the second hollow cylindrical tube respectively, and is used to convert the linear motion of the second connecting rod into the rotational motion of the second hollow cylindrical tube; The second cylindrical hollow tube is rotatably connected to the second fixed valve, and the outer wall of the second cylindrical hollow tube is provided with a second arc-shaped groove; one end of the second cylindrical hollow tube is open and the other end is closed; The second fixed valve is a hollow cylinder, and at least one third sliding groove along the axial direction is provided on the inner wall of the second fixed valve; the two end faces of the second fixed valve are respectively provided with a ninth through hole and a third ball seat hole, and a fifth annular protrusion is provided at the end of the second fixed valve near the third ball seat hole, and a sixth annular protrusion is provided on the end face of the fourth tube away from the third tube, and the sixth annular protrusion is connected to the fifth annular protrusion; The second movable valve is cylindrical, with one end closed and the other end open, the open end of the second movable valve facing the open end of the second cylindrical hollow cylinder; the outer wall of the second movable valve is provided with at least one second strip-shaped protrusion that matches the third sliding groove; at least one tenth through hole is provided on the side wall of the second movable valve. The fourth pin is placed in the tenth through hole and the second arc-shaped groove; The push rod assembly passes through the second movable valve and is connected to the second connecting rod.

19. The downhole gas-liquid separation device as described in claim 18, characterized in that, It also includes at least one fifth pin; The inner wall of the second fixed valve is provided with a third stepped boss, which includes a seventh boss and an eighth boss; the height of the seventh boss is greater than that of the eighth boss, and the end face of the seventh boss is used to limit the second movable valve; the end face of the eighth boss abuts against the second cylindrical hollow cylinder, and the eighth boss is provided with at least one radially eleventh through hole. The outer wall of the second movable valve is provided with a second annular groove, and the fifth pin is placed in the eleventh through hole and the second annular groove.

20. The downhole gas-liquid separation device as described in claim 18, characterized in that, The closed end of the second cylindrical hollow tube is provided with at least one sixth axial hole; the ninth through hole is used for the second connecting rod to pass through, and the third ball seat hole is used for the push rod assembly to pass through; the closed end of the second movable valve is provided with a fourth ball seat hole; The third radial hole, the fifth axial hole, the second axial hole, the third ball seat hole, the fourth ball seat hole, and the sixth axial hole form the liquid channel.

21. The downhole gas-liquid separation device as described in claim 20, characterized in that, The push rod assembly includes a straight rod, and a first ball seat and a second ball seat respectively connected to both ends of the straight rod. The straight rod passes through the third ball seat hole, and the first ball seat and the second ball seat are located on both sides of the third ball seat hole. One end of the first connecting rod is connected to a ball claw, and the second ball seat is placed in the ball claw.

22. The downhole gas-liquid separation device as described in claim 18, characterized in that, The second transmission assembly includes a third bevel gear and a fourth bevel gear. The third bevel gear is connected to the second connecting rod and the second fixed valve, respectively. The fourth bevel gear is connected to the second cylindrical hollow cylinder and meshes with the third bevel gear.

23. The downhole gas-liquid separation device as described in claim 22, characterized in that, The third bevel gear is provided with a third mounting hole and a fourth mounting hole. The third mounting hole penetrates the center of the end face of the third bevel gear, and the fourth mounting hole is an eccentric hole that penetrates the end face of the third bevel gear. The inner wall of the second fixed valve is provided with a third gear seat, the third gear seat includes a ninth boss and a fifth cylinder, the fifth cylinder is arranged radially along the second fixed valve, the third bevel gear is sleeved on the fifth cylinder, and the end face of the third bevel gear abuts against the ninth boss; The closed end of the second cylindrical hollow cylinder is provided with a fourth gear seat. The fourth gear seat includes a second base plate and a sixth cylinder. The sixth cylinder is perpendicular to the center of the second base plate. The fourth bevel gear is sleeved on the sixth cylinder, and the end face of the fourth bevel gear abuts against the second base plate.

24. The downhole gas-liquid separation device as described in claim 23, characterized in that, The outer wall of the fifth cylinder is provided with a third external thread, which is used to limit the third bevel gear by engaging with a bolt.

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