An eccentric valve type gas-proof rod type pump

Abstract

The application relates to an eccentric valve type gas-proof rod type pump and relates to the field of oilfield exploitation equipment technology, comprising a rod type pump body, an outer pipe assembly is arranged on the outer side of the rod type pump body, a primary gas-liquid separation structure is arranged at the bottom end of the rod type pump body, a secondary gas-liquid separation structure is arranged above the primary gas-liquid separation structure of the rod type pump body, a traveling control assembly is slidably connected to the inside of the secondary gas-liquid separation structure relative to the rod type pump body, the outer pipe assembly and the rod type pump body form a pump cylinder space at the secondary gas-liquid separation structure, and the traveling control assembly controls the communication between the medium in the pump cylinder space and the medium of the secondary gas-liquid separation structure. The application has the effects of improving pump efficiency, adapting to small liquid production, effectively lifting wells with high gas-liquid ratio and limited wellbore volume.

Description

Technical Field

[0001] This application relates to the field of oilfield extraction equipment technology, and in particular to an eccentric valve type anti-air rod pump. Background Technology

[0002] Gas injection is a major way to increase oil recovery. After gas injection, an increase in the gas-liquid ratio of the oil well is inevitable. Oil wells producing with gas present a challenge: how to improve pump efficiency and achieve normal production under high gas-liquid ratios is an industry-wide problem. Currently available tubular pumps and rod pumps are suitable for gas-liquid ratios ≤200m³. 3 / m 3 Once gas is encountered in the wellbore, only gas is produced and no liquid is produced. In order to solve the problem of effective lifting of wells with low liquid production and high gas-liquid ratio, an eccentric valve type anti-gas rod pump was designed.

[0003] Existing anti-gas pumps generally have an anti-gas valve designed at the top of the pump barrel. Through forced opening and closing during the lifting process, the normal lifting of gas after it enters the pump barrel is maintained. Alternatively, an air chamber section is designed in the upper part of the pump barrel. Utilizing the difference in gas and liquid density and the compressibility of gas, the gas entering the pump is discharged to the pump through the air chamber cavity. The gas does not pass through the traveling valve, thus avoiding the influence of the gas on opening the traveling valve and achieving forced exhaust.

[0004] Regarding the aforementioned technologies, the inventors believe that current designs for anti-gas rod pumps involve venting gas from inside the pump to the top, at the cost of liquid leakage into the pump chamber, but this still cannot solve the problem of producing only gas and no liquid under high gas-liquid ratios. Furthermore, for wells with low liquid production, high gas-liquid ratios, and limited wellbore volume, existing technologies are unusable due to their excessively large outer diameter. Summary of the Invention

[0005] In order to improve pump efficiency and adapt to the effective lifting of wells with small production volume, high gas-liquid ratio and limited well volume, this application provides an eccentric valve type anti-gas rod pump.

[0006] This application provides an eccentric valve type anti-pneumatic pump, which adopts the following technical solution:

[0007] An eccentric valve-type anti-gas rod pump includes a rod pump body, an outer tube assembly sleeved on the outer side of the rod pump body, a primary gas-liquid separation structure at the bottom end of the rod pump body, a secondary gas-liquid separation structure above the primary gas-liquid separation structure on the rod pump body, a sliding control component slidably connected to the rod pump body relative to the secondary gas-liquid separation structure, the outer tube assembly and the rod pump body forming a pump barrel space at the secondary gas-liquid separation structure, and the sliding control component controlling the communication between the medium inside the pump barrel space and the medium in the secondary gas-liquid separation structure.

[0008] Optionally, the rod pump body includes a long pump barrel, the primary gas-liquid separation structure is fixed at the bottom end of the long pump barrel, a fixed valve is provided inside the long pump barrel above the primary gas-liquid separation structure, the floating control component is slidably connected inside the long pump barrel, and the fixed valve controls the medium inside the primary gas-liquid separation structure and the medium in the long pump barrel between the floating control component and the fixed valve, thus connecting the two.

[0009] Optionally, the floating control assembly includes a short plunger slidably connected inside the long pump barrel, the outer wall of the short plunger abutting and sealing against the inner wall of the long pump barrel, a first floating valve and a second floating valve respectively provided on the short plunger, a plunger space being formed inside the short plunger between the first floating valve and the second floating valve, and a drive assembly provided at the top of the short plunger, the drive assembly driving the short plunger to move.

[0010] Optionally, the drive assembly includes a valve stem fixedly connected to the short plunger, an annular valve ball is provided on the outer side of the valve stem, an annular valve seat is provided on the long pump barrel relative to the position of the annular valve ball, the annular valve seat is located below the annular valve ball, and a liquid outlet is provided between the annular valve seat and the annular valve ball, the liquid outlet communicating with the upper space of the short plunger.

[0011] Optionally, the secondary gas-liquid separation structure includes a gas-liquid flow hole on the side wall of the long pump barrel, the gas-liquid flow hole connecting the interior of the long pump barrel with the pump barrel space. When the short plunger is at its lowest end, the gas-liquid flow hole is located above the short plunger, and when the short plunger is at its highest end, the gas-liquid flow hole is located below the short plunger.

[0012] Optionally, the inlet direction of the first traveling valve and the second traveling valve is located at the bottom end of the rod pump body.

[0013] Optionally, multiple gas-liquid flow holes are provided along the height direction. When the short plunger is at its top, the top gas-liquid flow hole is lower than the bottom of the short plunger. When the short plunger is at its bottom, the bottom gas-liquid flow hole is higher than the top of the short plunger.

[0014] Optionally, the inlet of the short plunger is located at the bottom end and is connected to the inlet end of the first traveling valve, while the outlet of the short plunger is located at the top end and is connected to the outlet end of the second traveling valve.

[0015] Optionally, the primary gas-liquid separation structure includes a filter screen tube located at the bottom end of the rod pump body, with a liquid inlet hole on the surface of the filter screen tube. The outer tube assembly has a gas cavity on the outer side relative to the filter screen tube, and the gas cavity is in space communication with the pump barrel. The top of the gas cavity is higher than the top of the liquid inlet hole.

[0016] Optionally, a one-way valve is fixedly connected to the outer pipe assembly at the location of the gas cavity, and the one-way valve separates the gas cavity from the pump cylinder space.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. Through optimized pump structure design, two-stage gas-liquid separation is achieved, followed by mixing and lifting of the gas and liquid in the upper part of the pump casing. This improves pump efficiency, adapts to small liquid production volumes, and enables high gas-liquid ratios (applicable to gas-liquid ratios ≤ 800m). 3 / m 3 This provides a new type of eccentric valve anti-gas rod pump for oil and gas production, enabling effective lifting of wells with limited well volume. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an eccentric valve type anti-air rod pump according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the pump body of an eccentric valve type anti-air rod pump according to an embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the outer pipe assembly of an eccentric valve type anti-air rod pump according to an embodiment of this application.

[0022] Figure 4 This is a structural schematic diagram of the bottom sealing support joint position of an eccentric valve type anti-air rod pump according to an embodiment of this application.

[0023] Figure 5 This is a structural schematic diagram of the short plunger position of an eccentric valve type anti-air rod pump according to an embodiment of this application.

[0024] Figure 6 This is a structural schematic diagram of the top sealing support joint position of an eccentric valve type anti-air rod pump according to an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Outer pipe assembly; 11. Bridge pipe; 12. Bottom sealing support joint; 13. Top sealing support joint; 14. Flared housing; 2. Rod pump body; 21. Bottom sealing support; 22. Top sealing support; 23. Filter screen tube; 24. Long pump barrel; 241. Gas-liquid flow hole; 25. Short plunger; 251. Upper space of plunger; 252. Lower space of plunger; 253. First traveling valve; 254. Second traveling valve; 255. Plunger space; 26. Valve stem; 261. Valve stem guide sleeve; 27. Liquid outlet; 28. Annular valve seat; 281. Annular valve ball; 3. Pump barrel space; 4. Check valve; 5. Fixed valve. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0028] Gas injection is a major way to increase oil recovery. After gas injection, an increase in the gas-liquid ratio of the oil well is inevitable. Oil wells producing with gas present a challenge: how to improve pump efficiency and achieve normal production under high gas-liquid ratios is an industry-wide problem. Currently available tubular pumps and rod pumps are suitable for gas-liquid ratios ≤200m³. 3 / m 3 Once gas is encountered in the wellbore, only gas is produced and no liquid is produced. In order to solve the problem of effective lifting of wells with low liquid production and high gas-liquid ratio, an eccentric valve type anti-gas rod pump was designed.

[0029] Existing anti-gas pumps generally have an anti-gas valve designed at the top of the pump barrel. Through forced opening and closing during the lifting process, the normal lifting of gas after it enters the pump barrel is maintained. Alternatively, an air chamber section is designed in the upper part of the pump barrel. Utilizing the difference in gas and liquid density and the compressibility of gas, the gas entering the pump is discharged to the pump through the air chamber cavity. The gas does not pass through the traveling valve, thus avoiding the influence of the gas on opening the traveling valve and achieving forced exhaust.

[0030] Regarding the aforementioned technologies, the inventors believe that current designs for anti-gas rod pumps involve venting gas from inside the pump to the top, at the cost of liquid leakage into the pump chamber, but this still cannot solve the problem of producing only gas and no liquid under high gas-liquid ratios. Furthermore, for wells with low liquid production, high gas-liquid ratios, and limited wellbore volume, existing technologies are unusable due to their excessively large outer diameter.

[0031] In order to improve pump efficiency and adapt to the effective lifting of wells with small production volume, high gas-liquid ratio and limited well volume, this application provides an eccentric valve type anti-gas rod pump.

[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0033] This application discloses an eccentric valve type anti-pneumatic pump. (Refer to...) Figure 1 An eccentric valve-type anti-air rod pump includes an outer pipe assembly 1, which includes an inlet end at the bottom, a valve stem end at the top, and a bridge pipe 11 between the inlet end and the valve stem end. The inlet end is fixedly connected to the bridge pipe 11, and the valve stem end is also fixedly connected to the bridge pipe 11. A rod pump body 2 is disposed inside the outer pipe assembly 1. The rod pump body 2 is sealed and fixedly connected to one side of the valve stem 26 end, and the rod pump body 2 is also sealed and fixedly connected to one side of the inlet end.

[0034] Reference Figure 2 , Figure 3 The outer pipe assembly 1 is provided with a bottom sealing support joint 12 at the bottom of the rod pump body 2. The rod pump body 2 is fixedly connected to the bottom sealing support joint 12 at the position of the bottom sealing support joint 12. The inside of the bottom sealing support joint 12 abuts against the bottom sealing support part 21 of the rod pump body 2 and is sealed and fixed.

[0035] The outer pipe assembly 1 is provided with a top sealing support joint 13 at the top of the rod pump body 2. The rod pump body 2 is fixedly connected to the top sealing support joint 13 at the position of the top sealing support joint 13. The interior of the top sealing support joint 13 abuts against the outer wall of the top sealing support part 22 of the rod pump body 2 and is sealed and fixed.

[0036] The bottom outer side and top outer side wall of the rod pump body 2 are sealed by the bottom sealing support joint 12 and the bottom sealing support part 21, the top sealing support joint 13 and the top sealing support part 22, and a gap is left between the outer side wall of the rod pump body 2 and the inner side wall of the outer pipe assembly 1 at the position relative to the bridge pipe 11. The rod pump body 2 and the outer pipe assembly 1 at the position relative to the bridge pipe 11 form an annular pump barrel space 3.

[0037] Reference Figure 4 , Figure 5 A flared housing 14 is provided on the side wall of the outer tube assembly 1 relative to the bottom sealing support joint 12. The interior of the flared housing 14 is in communication with the interior of the outer tube assembly 1. A one-way valve 4 is fixedly connected inside the flared housing 14. One end of the one-way valve 4 is fixedly connected to the inner side wall of the flared housing 14, and the other end of the one-way valve 4 is fixedly connected to the outer side wall of the bottom sealing support joint 12.

[0038] The inlet end of the check valve 4 is connected to the liquid inlet end at the bottom of the outer pipe assembly 1, and the outlet end of the check valve 4 is connected to the upper pump cylinder space 3. This allows the check valve 4 to guide the medium located at the bottom of the check valve 4 into the interior of the pump cylinder space 3, and to prevent the medium located inside the pump cylinder space 3 from being discharged from the bottom of the check valve 4 in the opposite direction.

[0039] The rod pump body 2 includes a filter screen tube 23 located at the bottom end of the bottom sealing support 21. The filter screen tube 23 has a hollow structure, and its interior is in communication with the interior of the bottom sealing support 21. Multiple liquid inlet holes are provided on the side wall of the filter screen tube 23, completely penetrating the side wall and thus connecting the interior of the inlet end of the outer pipe assembly 1 with the interior of the filter screen tube 23. The height of the topmost liquid inlet hole is lower than the height of the one-way valve 4, allowing the medium inside the inlet end to undergo primary gas-liquid separation through the filter screen tube 23. Liquid enters the interior of the filter screen tube 23 through the liquid inlet hole, while gas remains below the one-way valve 4.

[0040] A fixed valve 5 is fixedly connected to one end of the bottom sealing support 21 away from the filter screen tube 23. A long pump cylinder 24 is fixedly connected to one end of the fixed valve 5 away from the bottom sealing support 21. The long pump cylinder 24 is coaxially arranged with the bottom sealing support 21. The long pump cylinder 24 has a tubular structure, and one end of the long pump cylinder 24 is connected to the fixed valve 5. The other end of the long pump cylinder 24 is fixedly connected to the top sealing support. The outer wall diameter of the long pump cylinder 24 is smaller than the inner wall diameter of the bridge pipe 11, so that the pump cylinder space 3 is formed between the outer wall of the long pump cylinder 24 and the inner side of the bridge pipe 11.

[0041] The inlet end of the fixed valve 5 is in relative communication with the interior of the bottom sealing support 21, and the outlet end of the fixed valve is in relative communication with the interior of the long pump cylinder 24. The fixed valve 5 controls the medium that enters the bottom sealing support 21 through the bottom filter screen 23 to enter the interior of the long pump cylinder 24.

[0042] Reference Figure 5 , Figure 6A short plunger 25 is slidably connected inside the long pump barrel 24. A valve stem 26 is fixedly connected to the end of the short plunger 25 away from the fixed valve 5. The outer diameter of the valve stem 26 is smaller than the inner diameter of the long pump barrel 24, so that the outer side of the valve stem 26 and the inner side of the long pump barrel 24 form a plunger upper space 251. The end of the valve stem 26 extends from the end of the outer tube assembly 1 and is connected to the outside. A reducing connector is fixedly connected to the outer end of the valve stem 26. The outside moves the valve stem 26 up and down, which in turn moves the short plunger 25 inside the long pump barrel 24 up and down. The outer wall of the short plunger 25 is slidably and sealingly connected to the inside of the long pump barrel 24, so that the short plunger 25 divides the inside of the long pump barrel 24 into a plunger upper space 251 located above the short plunger 25 and a plunger lower space 252 located below the short plunger 25. The valve stem 26 drives the short plunger 25 to move up and down, thereby adjusting the pressure inside the space above and below the short plunger 25.

[0043] A valve stem guide sleeve 261 is fixedly connected to the top end of the top sealing support 22. The valve stem guide sleeve 261 is slidably connected to the valve stem 26 and is used to guide the movement of the valve stem 26. A liquid outlet 27 is provided between the top sealing support 22 and the valve stem guide sleeve 261. The interior of the liquid outlet 27 is in communication with the interior of the pump barrel space 3, so that the medium inside the pump barrel space 3 can flow out from the interior of the liquid outlet 27.

[0044] An annular valve seat 28 is fixedly connected at the top sealing support 22. A flow channel is opened inside the annular valve seat 28, completely penetrating the interior of the annular valve ball 281 and connecting the interior of the pump cylinder space 3 to the outlet 27. An annular valve ball 281 is positioned at the top of the annular valve seat 28, opposite the outlet 27. The annular valve ball 281 is sleeved on the outside of the valve stem 26 and is fixedly connected to the valve stem 26.

[0045] By moving the valve stem 26 up and down, the valve stem 26 drives the annular valve ball 281 to move synchronously. When the valve stem 26 moves upward, it drives the annular valve ball 281 to move upward, causing the annular valve ball 281 to disengage from the annular valve seat 28. The medium inside the pump cylinder space 3 is then discharged from the position between the annular valve ball 281 and the annular valve seat 28 through the outlet 27. When the valve stem 26 moves downward, it drives the annular valve ball 281 to move downward, causing the annular valve ball 281 to abut against the annular valve seat 28. The annular valve ball 281 seals the annular valve seat 28, closing the flow channel inside the annular valve seat 28, and thus sealing the top of the pump cylinder space 3.

[0046] The short plunger 25 has a hollow internal structure, and a first traveling valve 253 and a second traveling valve 254 are respectively provided at both ends of the short plunger 25. The first traveling valve 253 is fixedly connected to the short plunger 25 and is located at the top of the short plunger 25. The inlet end of the first traveling valve 253 communicates with the internal space of the short plunger 25, and the outlet end of the first traveling valve 253 communicates with the upper space 251 of the plunger. The second traveling valve 254 is located at the lower part of the short plunger 25. The second traveling valve 254 is fixedly connected to the short plunger 25, and the inlet end of the second traveling valve 254 communicates with the lower space 252 of the plunger. The outlet end of the second traveling valve 254 communicates with the internal space of the plunger.

[0047] The first traveling valve 253 and the second traveling valve 254 form a plunger space 255 that is closed at both ends inside the plunger. When the pressure inside the lower space 252 of the plunger is greater than the opening pressure of the second traveling valve 254, the medium inside the lower space 252 of the plunger opens the second traveling valve 254 and enters the plunger space 255. When the pressure inside the upper space 251 of the plunger is less than the opening pressure of the first traveling valve 253, the medium inside the plunger space 255 opens the first traveling valve 253 and enters the upper space 251 of the plunger.

[0048] A gas-liquid flow hole 241 is provided on the side wall of the long pump cylinder 24 at a position relative to the short plunger 25. The gas-liquid flow hole 241 completely penetrates the side wall of the long pump cylinder 24 and connects the interior of the long pump cylinder 24 with the interior of the bridge pipe 11, that is, the interior of the long pump cylinder 24 is connected with the pump cylinder space 3.

[0049] Multiple gas-liquid flow holes 241 are equidistantly arranged along the height direction. When the short plunger 25 moves to the top, the gas-liquid flow hole 241 at the top is located at the bottom of the short plunger 25, so that the space 252 below the short plunger 25 is connected to the pump barrel space 3 through the gas-liquid flow hole 241. When the short plunger 25 moves to the bottom, the gas-liquid flow hole 241 at the bottom is located at the top of the short plunger 25, so that the space above the short plunger 25 is connected to the pump barrel space 3 through the gas-liquid flow hole 241.

[0050] The sucker rod drives the reducing joint of the valve stem 26 to move downward, causing the valve stem 26 and the short plunger 25 to move downward as a whole. The annular valve ball 281 contacts the annular valve seat 28 and the seat seal is closed. The pump body space of the long pump barrel 24 is compressed to form positive pressure. The first floating valve 253 and the second floating valve 254 open successively, the fixed valve 5 closes, and the lateral check valve 4 closes.

[0051] As the short plunger 25 descends, before its lowest point passes through the gas-liquid flow hole 241, the lower space 252 of the plunger and the pump space 3 are connected via the gas-liquid flow hole 241. The gas in the lower part of the pump is compressed, with most of it entering the inner cavity of the side check valve 4 and a small portion merging with the liquid. When the pressure at the lower part of the second traveling valve 254 exceeds the pressure at the upper part, the second traveling valve 254 opens to allow liquid inlet, and gas and liquid enter the plunger space 255. As the gas and liquid continuously rise, and the pressure exceeds that of the first traveling valve 253, the traveling valve opens, and gas and liquid enter the upper space 251 of the plunger. The pressure in the upper pump space 3 continuously increases, and the gas is continuously compressed.

[0052] When the short plunger 25 passes through the gas-liquid flow hole 241, the pump barrel space 3 is independent of the internal space of the long pump barrel 24. The first floating valve 253 and the second floating valve 254 continuously supply liquid to the short plunger 25 and the upper space 251 of the plunger.

[0053] When the uppermost end of the short plunger 25 passes through the lowermost end of the gas-liquid flow hole 241, the pump body space and the upper space 251 of the plunger are connected through the gas-liquid flow hole 241, and the gas in the pump barrel space 3 escapes upward to the upper space 251 of the plunger through the gas-liquid flow hole 241.

[0054] The short plunger 25 continues to move downwards, and the short plunger 25 is filled with liquid until the end of the stroke, completing the downstroke process.

[0055] The sucker rod drives the valve stem 26 reducing joint to move upward, causing the valve stem 26 and short plunger 25 to move upward as a whole. The annular valve ball 281 on the valve stem 26 opens, and the oil pipe space, the upper plunger space 251 and the pump barrel space 3 at the position of the annular valve ball 281 are in a connected state. The compressed gas accumulated in the pump barrel space 3 during the downstroke enters the upper plunger space 251 and is discharged to the upper oil pipe through the outlet 27 of the annular valve ball 281.

[0056] The short plunger 25 moves upward from the bottom. Before the bottom end of the short plunger 25 passes through the bottom end of the gas-liquid flow hole 241, a negative pressure is formed in the space between the short plunger 25 and the fixed valve 5. The fluid in the oil well flows through the filter screen tube 23 and performs the first gas-liquid separation. The gas enters the pump barrel and the annulus of the oil pipe, and the liquid enters the lower pump barrel. The fixed valve 5 opens to allow liquid inlet, and the pressure system of the side check valve 4 remains unchanged and is in the closed state.

[0057] As the short plunger 25 continues to move upward, its lowermost end passes through the uppermost end of the gas-liquid flow hole 241. The pump body space and the lower plunger space 252 then connect through the flow hole. With the short plunger 25 continuing to rise, negative pressure is created in both the pump body space and the lower plunger space 252. The fixed valve 5 remains closed due to the presence of liquid above it. The lateral check valve 4 opens due to the negative pressure. The gas in the pump barrel space 3 and the liquid in the lower plunger space 252 undergo convection under the influence of gravity due to their density difference. The gas mixes and rises to the top, resulting in a gas-to-liquid distribution within the pump barrel, lifting the fluid to the ground.

[0058] In this application, the term "multiple" refers to at least two or more, unless otherwise expressly defined. The terms "installed," "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "linked" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. An eccentric valve type anti-air rod pump, characterized in that: The device includes a rod-type pump body (2), an outer tube assembly (1) sleeved on the outside of the rod-type pump body (2), a primary gas-liquid separation structure at the bottom end of the rod-type pump body (2), a secondary gas-liquid separation structure above the primary gas-liquid separation structure of the rod-type pump body (2), a sliding control component slidably connected to the rod-type pump body (2) relative to the secondary gas-liquid separation structure, the outer tube assembly (1) and the rod-type pump body (2) forming a pump barrel space (3) at the secondary gas-liquid separation structure, and the sliding control component controlling the communication between the medium inside the pump barrel space (3) and the medium of the secondary gas-liquid separation structure.

2. The eccentric valve type anti-air rod pump according to claim 1, characterized in that: The rod pump body (2) includes a long pump barrel (24). The first-stage gas-liquid separation structure is fixed at the bottom end of the long pump barrel (24). A fixed valve (5) is provided inside the long pump barrel (24) above the first-stage gas-liquid separation structure. The floating control component is located inside the long pump barrel (24) and is slidably connected. The fixed valve (5) controls the medium inside the first-stage gas-liquid separation structure and the medium between the floating control component and the fixed valve (5) in the long pump barrel (24), and the two are connected.

3. The eccentric valve type anti-air rod pump according to claim 2, characterized in that: The movement control assembly includes a short plunger (25) slidably connected inside the long pump barrel (24). The outer wall of the short plunger (25) abuts and seals against the inner wall of the long pump barrel (24). A first moving valve (253) and a second moving valve (254) are respectively provided on the short plunger (25). A plunger space (255) is formed inside the short plunger (25) between the first moving valve (253) and the second moving valve (254). A drive assembly is provided at the top of the short plunger (25), and the drive assembly drives the short plunger (25) to move.

4. The eccentric valve type anti-air rod pump according to claim 3, characterized in that: The drive assembly includes a valve stem (26) fixedly connected to the short plunger (25). An annular valve ball (281) is provided on the outer side of the valve stem (26). An annular valve seat (28) is provided on the long pump cylinder (24) relative to the position of the annular valve ball (281). The annular valve seat (28) is located below the annular valve ball (281). An outlet (27) is provided between the annular valve seat (28) and the annular valve ball (281). The outlet (27) communicates with the upper space of the short plunger (25).

5. The eccentric valve type anti-air rod pump according to claim 3, characterized in that: The secondary gas-liquid separation structure includes a gas-liquid flow hole (241) on the side wall of a long pump barrel (24). The gas-liquid flow hole (241) connects the interior of the long pump barrel (24) with the pump barrel space (3). When the short plunger (25) is at its lowest point, the gas-liquid flow hole (241) is located above the short plunger (25). When the short plunger (25) is at its highest point, the gas-liquid flow hole (241) is located below the short plunger (25).

6. The eccentric valve type anti-air rod pump according to claim 3, characterized in that: The liquid inlet direction of the first traveling valve (253) and the second traveling valve (254) is located at the bottom end of the rod pump body (2).

7. The eccentric valve type anti-air rod pump according to claim 5, characterized in that: Multiple gas-liquid flow holes (241) are arranged along the height direction. When the short plunger (25) is at the top, the top gas-liquid flow hole (241) is lower than the bottom of the short plunger (25). When the short plunger (25) is at the bottom, the bottom gas-liquid flow hole (241) is higher than the top of the short plunger (25).

8. The eccentric valve type anti-air rod pump according to claim 6, characterized in that: The inlet of the short plunger (25) is located at the bottom end and is connected to the inlet of the first moving valve (253). The outlet of the short plunger (25) is located at the top end and is connected to the outlet of the second moving valve (254).

9. The eccentric valve type anti-air rod pump according to claim 1, characterized in that: The primary gas-liquid separation structure includes a filter screen tube (23) located at the bottom end of the rod pump body (2). The filter screen tube (23) has an inlet hole on its surface. The outer tube assembly (1) has a gas cavity on the outside of the filter screen tube (23). The gas cavity is connected to the pump cylinder space (3). The top of the gas cavity is higher than the top of the inlet hole.

10. An eccentric valve type anti-air rod pump according to claim 9, characterized in that: The outer pipe assembly (1) is fixedly connected to a one-way valve (4) at the location of the gas cavity, and the one-way valve (4) separates the gas cavity from the pump cylinder space (3).

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