A jet pump well reversing wellhead device

Abstract

A jet pump well reversing wellhead device. This invention includes a Christmas tree, a jet pump, and a power pump; a gate valve III is installed at the upper end of the Christmas tree, and gate valves I and II are respectively installed on both sides of the Christmas tree; the power pump is connected to gate valve I via a power fluid pipeline, and a reversing manifold I is installed on the power fluid pipeline; the power pump is connected to gate valve II via a produced fluid pipeline, and a reversing manifold II is installed on the produced fluid pipeline; the control system switches the operating mode of the jet pump well reversing device by controlling the power pump, reversing manifold I, and reversing manifold II. Its advantages are: a reasonable structural design; partial modification of existing hydraulic jet pump wellhead process manifolds; simplification of the gas production tree structure; optimization of on-site manual operation; and improved production efficiency; the jet pump well reversing wellhead device, combined with automated control technology, can complete well cleaning operations through both local and remote control modes, facilitating maintenance operations, reducing safety risks, and improving operational efficiency.

Description

Technical Field

[0001] This invention relates to a wellhead device for a jet pump well, and more particularly to a reversing wellhead device for a jet pump well, belonging to the field of oil and gas development technology. Background Technology

[0002] With the continuous exploitation of oil and gas fields, the increasing number of highly deviated and sand-bearing wells has rendered traditional rod-operated drainage processes inadequate, leading to the emergence of various new rodless drainage technologies and processes. Concentric tube hydraulic jet pumps, with their advantages of having no moving parts, simple structure, reliable operation, ease of use, low maintenance costs, and wide applicability, are increasingly widely used in rodless oil production operations. However, the pump core of concentric tube hydraulic jet pumps is prone to scaling, requiring regular maintenance, which is relatively complex and poses a higher safety hazard, becoming a technical bottleneck for the widespread application of concentric tube hydraulic jet pump oil production technology.

[0003] Currently, depending on the quality of the produced water, concentric tube hydraulic jet pumps require regular shutdowns for reverse well cleaning and pump core lifting maintenance to prevent pump core jamming and other malfunctions caused by scaling. These routine maintenance operations are scheduled twice or once a week, depending on the well conditions. Routine maintenance such as reverse well cleaning and pump core lifting requires on-site personnel, who must overcome factors such as poor road conditions and time conflicts to complete the maintenance work on time. In extreme weather, slippery and difficult-to-access roads to the well site make timely maintenance extremely challenging, leading to the inability to clean scale from the concentric tube hydraulic jet pump valve core in a timely manner, resulting in pump jamming accidents. This disrupts the normal production and drainage operations, requiring more time, manpower, and resources to troubleshoot the problem, increasing extraction costs. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings in the conventional maintenance of existing concentric tube hydraulic jet pumps, the present invention provides a jet pump well reversing wellhead device.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a jet pump well reversing wellhead device, including a production tree, a jet pump, and a power pump that provides power fluid; the downhole pipeline includes a casing, a production tubing, and a central tubing arranged from the outside to the inside, and the pump barrel of the jet pump is installed at the lower end of the production tubing.

[0006] A gate valve III is installed at the upper end of the wellhead, and gate valves I and II are installed on the two wings of the wellhead respectively; the power pump is connected to gate valve I through a power fluid pipeline, and a reversing manifold I is installed on the power fluid pipeline; the power pump is connected to gate valve II through a produced fluid pipeline, and a reversing manifold II is installed on the produced fluid pipeline.

[0007] The control system switches the operating mode of the jet pump well reversing device by controlling the power pump, reversing manifold I, and reversing manifold II.

[0008] The electric valve I of the reversing manifold I is installed axially along the power fluid pipeline, and the electric valve II of the reversing manifold I is installed on a branch of the power fluid pipeline.

[0009] The outlet end of the electric valve II is connected to the circulation pipeline I, and the other end of the circulation pipeline I is connected to the extracted water tank.

[0010] The electric valve IV of the reversing manifold II is installed along the axial direction of the produced fluid pipeline, and the electric valve III of the reversing manifold II is installed on a branch of the produced fluid pipeline.

[0011] The outlet end of the electric valve III is connected to the circulation pipeline II, and the other end of the circulation pipeline II is connected to the extracted water tank.

[0012] The electric valves I, II, III, and IV, the power pump, and the control system are connected. The control system controls the forward and reverse working modes of the jet pump well reversing device through a PLC program.

[0013] In the forward production mode of the jet pump well, gate valves I and II are open, and gate valve III is closed; electric valves I and III are open, and electric valves II and IV are closed. When the power pump is started, high-pressure power fluid sequentially passes through electric valve I, the power fluid pipeline, gate valve I, and the annulus of the central pipeline into the well. The mixture formed by the high-pressure power fluid and formation fluid enters the produced water tank through the jet pump, the annulus, gate valve II, the produced fluid pipeline, electric valve III, and circulation pipeline II.

[0014] In the reverse circulation well-washing operation mode of the jet pump well, gate valves I and II are open, and gate valve III is closed; electric valves II and IV are open, and electric valves I and III are closed. When the power pump is started, the high-pressure power fluid flows in reverse through electric valve IV, the produced fluid pipeline, gate valve II, and the oil-oil annulus to the area below the jet pump core, pushing the pump core upward and opening the backwashing channel. Afterward, the power fluid flows in sequence through the central oil pipe, gate valve I, the power fluid pipeline, electric valve II, and circulation pipeline I into the produced water tank.

[0015] In the jet pump core maintenance / replacement mode, the pressure of the power fluid is increased to lift the jet pump core to the upper gate valve III of the gas production tree; the power pump stops running, gate valve III is opened and the pump core is removed; then the pump core is inserted into the central oil pipe into the lower jet pump.

[0016] The beneficial effects of this invention are that it has a reasonable structural design, makes partial modifications to the existing hydraulic jet pump wellhead process manifold, simplifies the gas production tree structure, optimizes on-site manual operation, and improves production efficiency; the jet pump well reversing wellhead device, combined with automated control technology, can complete well washing operations through local / remote control modes, which facilitates maintenance operations, reduces safety risks, and improves operational efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the jet pump well reversing wellhead device of the present invention.

[0018] Figure 2 This is a schematic diagram of the downhole device structure of the present invention.

[0019] In the diagram: 1. Electric valve I, 2. Electric valve II, 3. Electric valve III, 4. Electric valve IV, 5. Power fluid line, 6. Produced fluid line, 7. Gate valve I, 8. Gate valve II, 9. Gate valve III, 10. Central line, 11. Power pump, 12. Circulation line I, 13. Circulation line II; 21. Jet pump, 22. Casing, 23. Production tubing, 24. Central tubing, 25. Pump barrel, 26. Casing annulus, 27. Oil-to-oil annulus, 31. Reversing manifold I, 32. Reversing manifold II, 100. Reversing assembly, 200. Christmas tree. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that the present invention is not limited to the specific embodiments listed, and any embodiment that conforms to the spirit of the present invention should be included within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "seal" should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components. A seal can be an oil seal, a packing seal, or other forms of seal. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] See appendix Figure 1 , 2 The present invention discloses a jet pump well reversing wellhead device, comprising a reversing assembly 100, a tree trunk 200, a jet pump 21, and a power pump 11 for providing power fluid; the downhole pipeline 10 includes a casing 22, a production tubing 23, and a center tubing 24 arranged from the outside to the inside, and the pump barrel 25 of the jet pump 21 is installed at the lower end of the production tubing 23.

[0024] A gate valve Ⅲ9 is installed at the upper end of the tree 200, and gate valves Ⅰ7 and Ⅱ8 are installed on the two wings of the tree 200 respectively.

[0025] The power pump 11 is connected to the gate valve I7 via the power fluid pipeline 5, and a reversing manifold I31 is installed on the power fluid pipeline 5.

[0026] The power pump 11 is connected to the gate valve II 8 through the produced fluid pipeline 6, and the produced fluid pipeline 6 is equipped with a reversing manifold II 32.

[0027] The control system switches the working mode of the jet pump well reversing device by controlling the power pump 11, reversing manifold I 31, and reversing manifold II 32.

[0028] Furthermore, the electric valve I1 of the reversing manifold I31 is arranged axially along the power fluid pipeline 5, and the electric valve II2 of the reversing manifold I31 is arranged on a branch of the power fluid pipeline 5.

[0029] The outlet end of the electric valve II2 is connected to the circulation pipeline I12, and the other end of the circulation pipeline I12 is connected to the extracted water tank.

[0030] Furthermore, the electric valve IV4 of the reversing manifold II 32 is axially arranged along the produced fluid pipeline 6, and the electric valve III3 of the reversing manifold II 32 is arranged on a branch of the produced fluid pipeline 6.

[0031] The outlet end of the electric valve Ⅲ3 is connected to the circulation pipeline Ⅱ13, and the other end of the circulation pipeline Ⅱ13 is connected to the extracted water tank.

[0032] Furthermore, the electric valve I1, electric valve II2, electric valve III3, electric valve IV4, and power pump 11 are connected to the control system, and the control system controls the working mode of the jet pump through a PLC program.

[0033] The forward production mode of the jet pump well: Gate valve I7 and gate valve II8 are open, and gate valve III9 is ​​closed; electric valve I1 and electric valve III3 are in the open state, and electric valve II2 and electric valve IV4 are in the closed state.

[0034] When the power pump 11 is started, the high-pressure power fluid enters the well through the annulus 26 of the oil casing via the electric valve I1, power fluid pipeline 5, gate valve I7, and central pipeline 11. The mixture formed by the high-pressure power fluid and formation fluid enters the produced water tank through the jet pump 21, oil-oil annulus 27, gate valve II8, produced fluid pipeline 6, electric valve III3, and circulation pipeline II13.

[0035] The reverse circulation well washing operation mode of the jet pump well: Gate valve I7 and gate valve II8 are open, and gate valve II9 is ​​closed; electric valve II2 and electric valve IV4 are in the open state, and electric valve I1 and electric valve III3 are in the closed state.

[0036] When the power pump 11 is started, the high-pressure power fluid flows in reverse through the electric valve IV4, the produced fluid pipeline 6, the gate valve II8, and the oil-oil annulus 27 to the bottom of the jet pump 21 pump core, pushing the pump core upward and opening the backwash channel. Then the power fluid flows in sequence through the central oil pipe 24, the gate valve I7, the power fluid pipeline 5, the electric valve II2, and the circulation pipeline I12 into the produced water tank.

[0037] Jet pump 21 core maintenance / replacement mode: In the reverse circulation well washing mode of the jet pump well, increase the pressure of the power fluid to lift the core of the jet pump 21 to the upper gate valve III9 of the gas production tree 200; the power pump 11 stops running, and the gate valve III9 is ​​opened to remove the core; then the core is inserted into the jet pump 21 at the lower end of the central tubing 24.

[0038] like Figure 1 As shown, the jet pump well reversing device of the present invention mainly includes a wellhead device, a downhole device and a control system. The wellhead device includes a reversing assembly 100, a tree trunk 200 and a power pump 11 that provides power fluid; the downhole device includes a jet pump 21 and a downhole pipeline 10.

[0039] The upper end of the wellhead 200 is provided with gate valve III9, and the wellhead 200 is provided with left and right wings, with gate valve I7 and gate valve II8 respectively provided on the left and right wings. Preferably, gate valve I7 is located above gate valve II8.

[0040] The reversing assembly 100 includes reversing valve group I 31 and reversing valve group II 32.

[0041] The power pump 11 is connected to the gate valve I7 of the tree 200 via the power fluid pipeline 5, and the reversing manifold I31 is installed on the power fluid pipeline 5.

[0042] The power pump 11 is connected to the gate valve II 8 of the wellhead 200 through the produced fluid pipeline 6, and the reversing manifold II 32 is installed on the produced fluid pipeline 6.

[0043] like Figure 2As shown, the downhole device includes a downhole pipeline 10 and a jet pump 21.

[0044] The casing 22, production tubing 23, and center tubing 24 of the downhole pipeline 10 are coaxially arranged from the outside to the inside. The jet pump 21 is located at the lower end of the production tubing 23 and the center tubing 24, and the pump barrel 25 of the jet pump 21 is fixedly installed at the lower end of the production tubing 23.

[0045] The control system switches the working mode of the jet pump well reversing device by controlling the power pump 11, reversing manifold I 31, and reversing manifold II 32.

[0046] The reversing manifold I31 includes electric valve I1 and electric valve II2. Electric valve I1 is axially arranged along the power fluid pipeline 5, and electric valve II2 is arranged on a branch of the power fluid pipeline 5. The outlet end of electric valve II2 is connected to circulation pipeline I12, and the other end of circulation pipeline I12 is connected to the produced water tank (not shown in the figure).

[0047] The reversing manifold II 32 includes electric valve III 3 and electric valve IV 4. Electric valve IV 4 is arranged axially along the produced fluid pipeline 6, and electric valve III 3 is arranged on a branch of the produced fluid pipeline 6.

[0048] The outlet end of the electric valve Ⅲ3 is connected to the circulation pipeline Ⅱ13, and the other end of the circulation pipeline Ⅱ13 is connected to the extracted water tank.

[0049] The electric valves I1, II2, III3, and IV4, as well as the power pump 11, are connected to the control system. The PLC program of the control system sets the control program according to the well conditions, sets the backwashing operation time and the time for replacing the valve core of the jet pump 21; it can also determine the working status of the jet pump and control the working mode of the jet pump well reversing device based on the real-time feedback of the jet pump working data.

[0050] The forward production working mode of the jet pump well, i.e. the normal working mode, is as follows: gate valves I7 and II8 of the production tree 200 are open, and gate valve III9 is ​​closed; electric valves I1 and III3 of the reversing assembly 100 are in the open state, and electric valves II2 and IV4 are in the closed state.

[0051] When the power pump 11 is started, the high-pressure power fluid delivered by the power pump 11 passes through the electric valve I1, the power fluid pipeline 5, the gate valve I7, and the annulus 26 of the central pipeline 11 (the annular space between the casing 22 and the production tubing 23) into the well. The mixture formed by the high-pressure power fluid and the formation fluid then passes through the jet pump 21, the oil-oil annulus 27 (the annular space between the production tubing 23 and the central tubing 24), the gate valve II8, the produced fluid pipeline 6, the electric valve III3, and the circulation pipeline II13 into the produced water tank.

[0052] The reverse circulation well washing working mode of the jet pump well, namely the reverse well washing working mode: the gate valve I7 and gate valve II8 of the production tree 200 are open, and the gate valve II9 is ​​closed; the electric valve II2 and electric valve IV4 of the reversing assembly 100 are in the open state, and the electric valve I1 and electric valve III3 are in the closed state.

[0053] Start the power pump 11. The high-pressure power fluid delivered by the power pump 11 flows in reverse through the electric valve IV4, the produced fluid pipeline 6, the gate valve II8, and the oil-oil annulus 27 to the bottom of the jet pump 21 pump core, pushing the pump core upward and opening the backwash channel. Then, the high-pressure power fluid flows in sequence through the central oil pipe 24, the gate valve I7, the power fluid pipeline 5, the electric valve II2, and the circulation pipeline I12 into the produced water tank until the backwashing well operation is completed.

[0054] When the core of the jet pump 21 needs maintenance / replacement, in the reverse circulation well washing mode of the jet pump well, the output pressure of the power pump 11 is increased, the pressure of the power fluid is increased, and the core of the jet pump 21 is lifted to the gate valve III9 at the upper end of the gas production tree 200. After that, the power pump 11 stops running, the gate valve III9 is ​​opened to take out the valve core, and the valve core is maintained or replaced. Then, the maintained or new pump core is put into the central tubing 24 and falls into the lower jet pump 21.

[0055] This invention relates to a jet pump wellhead reversing device, which simplifies the original gas production tree structure. Normal production and reverse circulation do not require closing the valves on the left and right wings of the gas production tree, simplifying on-site manual operations and improving efficiency and safety. The device allows for remote control of the jet pump's operating mode. After well cleaning and valve core replacement maintenance, the pump core is pushed down to the pump barrel, where it sets under pressure, allowing for normal production operations. This invention combines automatic control and wireless communication technologies, enabling the entire device to perform well cleaning remotely even when personnel cannot reach the site on time. This facilitates maintenance while reducing safety risks and improving operational efficiency.

[0056] It should be noted that the above embodiments are examples and not limitations of the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A jet pump wellhead reversing device, comprising a Christmas tree, a jet pump, and a power pump for providing power fluid; the downhole piping includes a casing, a production tubing, and a central tubing arranged from the outside to the inside, and the jet pump barrel is installed at the lower end of the production tubing, characterized in that: Gate valve III is installed at the top of the wellhead, and gate valve I and gate valve II are installed on the two wings of the wellhead respectively; The power pump is connected to gate valve I via a power fluid pipeline, and a reversing manifold I is installed on the power fluid pipeline; The power pump is connected to gate valve II via a produced fluid pipeline, and a reversing manifold II is installed in the produced fluid pipeline; The control system switches the working mode of the jet pump well reversing device by controlling the power pump, reversing manifold I, and reversing manifold II. The electric valve I of the reversing manifold I is installed along the axial direction of the power fluid pipeline, and the electric valve II of the reversing manifold I is installed on a branch of the power fluid pipeline. The outlet end of the electric valve II is connected to the circulation pipeline I, and the other end of the circulation pipeline I is connected to the extracted water tank. The electric valve IV of the reversing manifold II is installed along the axial direction of the produced fluid pipeline, and the electric valve III of the reversing manifold II is installed on a branch of the produced fluid pipeline. The outlet end of the electric valve III is connected to the circulation pipeline II, and the other end of the circulation pipeline II is connected to the extracted water tank. The electric valves I, II, III, and IV, the power pump, and the control system are connected. The control system controls the forward and reverse working modes of the jet pump well reversing device through a PLC program. In the forward production operation mode of the jet pump well, gate valve I and gate valve II are open, and gate valve III is closed; electric valve I and electric valve III are in the open state, and electric valve II and electric valve IV are in the closed state. When the power pump is started, the high-pressure power fluid enters the well through the annular space between the casing and the production tubing of the downhole pipeline in sequence through electric valve I, power fluid pipeline, gate valve I, and the casing and production tubing of the downhole pipeline. The mixture formed by the high-pressure power fluid and the formation fluid enters the produced water tank through the jet pump, the annular space between the production tubing and the central tubing, gate valve II, produced fluid pipeline, electric valve III, and circulation pipeline II. In the reverse circulation well washing operation mode of the jet pump well, gate valve I and gate valve II are open, and gate valve III is closed; electric valve II and electric valve IV are in the open state, and electric valve I and electric valve III are in the closed state. Start the power pump. The high-pressure power fluid flows in reverse through the electric valve IV, the produced fluid pipeline, the gate valve II, and the oil-oil annulus to the bottom of the jet pump core, pushing the pump core upward and opening the backwash channel. Then the power fluid flows in sequence through the central oil pipe, the gate valve I, the power fluid pipeline, the electric valve II, and the circulation pipeline I into the produced water tank. In the jet pump core maintenance / replacement mode, the pressure of the power fluid is increased to lift the jet pump core to the upper gate valve III of the production tree; the power pump stops running, gate valve III is opened to remove the pump core; then the pump core is inserted into the jet pump at the lower end of the central tubing.

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