Forced lifting device for pump core of concentric pipe hydraulic jet pump

Abstract

According to the forced lifting device for the pump core of the concentric pipe hydraulic jet pump, a centralizing short section and a lifting short section are connected from top to bottom to form a pump core shell, and the inner diameter of the centralizing short section is smaller than that of the lifting short section; a nozzle and a throat pipe are arranged at the lower part of an inner hole of the lifting nipple; a one-way valve I for feeding liquid from top to bottom is arranged at the upper part of the centralizing nipple; the lifting device is arranged above the nozzle in the lifting nipple; a valve rod of the lifting device is arranged on the valve seat, and a rod body of the valve rod moves along an inner hole of the valve seat; the spring is sleeved outside the rod body of the valve rod and the shaft diameter of the upper end of the valve seat; when liquid enters the position above the valve seat through the axial liquid flow hole of the valve seat, the valve rod is jacked upwards, the head of the upper end of the valve rod is sealed with the centralizing short section, and the pump core is lifted to the ground. The invention has the beneficial effects that the design is reasonable, the structure is simple, a forced lifting structure is adopted, the problem that the pump core is difficult to lift out due to blockage of the pump core of the concentric pipe hydraulic jet pump is solved, the device is particularly suitable for high-salinity oil-gas well exploitation, the development cost is effectively reduced, and the exploitation efficiency is improved.

Description

Technical Field

[0001] The invention relates to a concentric tube hydraulic jet pump, in particular to a pump core forced lifting device of the concentric tube hydraulic jet pump, belonging to the technical field of oil and gas development. Background Art

[0002] With the continuous development of oil and gas, the number of highly deviated wells and horizontal wells is gradually increasing, and the problem of eccentric wear of rods caused by rod production technology is becoming more and more prominent. In order to solve this problem, rodless production technology came into being. The concentric tube hydraulic jet pump stands out among many technologies due to its outstanding advantages, especially the feature that the pump core can be lifted out (inspected) without operation, which has been favored by users. However, in highly mineralized oil wells, the pump core of the concentric tube hydraulic jet pump is prone to jamming due to severe scaling. When the pump core is jammed, it is necessary to lower a salvage tool, or even to lift the pipe string to lift the pump core out of the wellbore. The long non-production operation time has become a technical bottleneck restricting the promotion and application of concentric tube hydraulic jet pumps, resulting in increased development costs and reduced efficiency of highly mineralized oil wells. Summary of the invention

[0003] In order to overcome the drawbacks of the existing concentric tube hydraulic jet pump in high-mineralization oil wells, in which the pump core is stuck and the pump core cannot be lifted out, resulting in increased development costs and reduced efficiency, the present invention provides a concentric tube hydraulic jet pump pump core forced lifting device.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a concentric tube hydraulic jet pump pump core forced lifting device, comprising an outer pump barrel, an inner pump barrel, and a pump core, the outer pump barrel, the inner pump barrel, and the pump core are coaxially arranged from outside to inside, there is an annulus I between the outer pump barrel and the inner pump barrel, there is an annulus II between the inner pump barrel and the pump core housing, the righting pup joint and the lifting pup joint are connected from top to bottom to form a pump core housing, the inner diameter of the righting pup joint is smaller than the inner diameter of the lifting pup joint; a nozzle and a throat are arranged at the lower part of the inner hole of the lifting pup joint, and a one-way valve I for liquid intake from top to bottom is arranged at the upper part of the righting pup joint; the lifting device is arranged above the nozzle in the lifting pup joint.

[0005] The valve stem of the lifting device is arranged on the valve seat, and the rod body of the valve stem moves along the inner hole of the valve seat; the spring is sleeved on the rod body of the valve stem and the outer axial diameter of the upper end of the valve seat; when the liquid enters the upper part of the valve seat through the axial liquid flow hole of the valve seat, the valve stem is pushed upward, the upper end head of the valve stem is sealed with the straightening short joint, and the pump core is lifted to the ground.

[0006] The pump core housing is provided with a throat, a nozzle, a lifting device and a one-way valve in sequence from bottom to top.

[0007] The pump core housing above the one-way valve is provided with a radial through hole I; the pump core housing between the one-way valve and the lifting device is provided with a radial through hole II; and the pump core housing between the nozzle and the throat is provided with a radial through hole III.

[0008] The radial through hole I, radial through hole II and radial through hole III all connect the annulus II with the inner cavity of the pump core.

[0009] A radial through hole IV is provided at the corresponding position of the inner pump barrel and the pump core housing below the throat pipe, and the radial through hole IV connects the annulus I with the inner cavity of the pump core;

[0010] A sealing device is arranged between the inner pump barrel on the side of the radial through hole IV and the pump core housing to establish a passage between the annulus I and the inner cavity of the pump core.

[0011] A sealing ring is arranged in the annulus between the inner pump barrel and the pump core housing between the radial through hole II and the radial through hole III.

[0012] The inner pump barrel below the pump core housing is provided with a one-way valve II, and the formation fluid enters the inner pump barrel through the one-way valve II.

[0013] When the concentric tube hydraulic jet pump is in normal production operation, the power fluid enters the inner pump barrel, opens the one-way valve I of the pump core downward in turn through the radial through hole I, pushes down the valve stem of the lifting device, and then the power fluid increases in speed through the nozzle, forming a low-pressure area in the inner cavity between the nozzle and the throat; at the same time, the one-way valve II at the bottom of the inner pump barrel opens, and the formation fluid enters the inner pump barrel through the one-way valve II, and then enters the inner cavity of the pump core between the nozzle and the throat through the radial through hole III, and mixes with the high-speed power fluid sprayed from the nozzle and passes downward through the throat; the mixed liquid that passes through the throat 14 enters the annulus I between the outer pump barrel and the inner pump barrel through the radial through hole IV and is discharged upward from the wellbore.

[0014] When the concentric tube hydraulic jet pump forcibly lifts the pump core, the one-way valve II at the bottom of the inner pump barrel is closed, and the power fluid is transported downhole from the annulus I between the outer pump barrel and the inner pump barrel, and the power fluid enters the inner cavity of the pump core through the radial through hole IV; the power fluid in the inner cavity of the pump core then passes through the throat and the nozzle upward in sequence, and enters above the valve seat through the axial liquid flow hole of the valve seat, and the power fluid pushes the valve stem to move upward, and the upper end of the valve stem is sealed with the straightening nipple, and the pressure is continuously applied until the pump core is lifted out of the wellbore.

[0015] The beneficial effects of the present invention are that it has a reasonable design and a simple structure, and adopts a forced lifting device to solve the problem of the pump core of the concentric tube hydraulic jet pump being stuck, which makes it difficult to remove the pump core. The present invention is particularly suitable for the exploitation of high-mineralization oil and gas wells, and promotes the promotion and application of the concentric tube hydraulic jet pump oil production technology in the development of high-mineralization oil wells, effectively reducing development costs and improving exploitation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the pump core forced lifting device of the present invention.

[0017] Figure 2It is a schematic diagram of normal production operation of the concentric tube hydraulic jet pump of the present invention.

[0018] Figure 3 It is a schematic diagram of the pump core lifting operation of the concentric tube hydraulic jet pump of the present invention.

[0019] In the figure: 1. righting nipple, 2. radial through hole II, 3. lifting nipple, 4. valve stem, 5. spring, 6. valve seat, 7. axial liquid flow hole, 8. annulus I, 9. outer pump barrel, 10. inner pump barrel, 11. non-return valve I, 12. sealing ring, 13. nozzle, 14. throat, 15. sealing device, 16. radial through hole IV, 17. annulus II, 18. non-return valve II, 19. lifting device, 20. radial through hole I, 21. pump core, 22. pump core housing, 23. radial through hole III. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, those skilled in the art should be aware that the present invention is not limited to the specific embodiments listed, and all embodiments should be included in the protection scope of the present invention as long as they conform to the spirit of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing or simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connection", and "seal" should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection, a direct connection, an indirect connection, or an integral connection; it can be a mechanical connection, an indirect connection through an intermediate medium, or a communication between the two components. The seal can be an oil seal, a packing seal, or other forms of seals. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See attached Figure 1-3, the arrows in the figure indicate the direction of liquid flow. A concentric tube hydraulic jet pump pump core forced lifting device of the present invention comprises an outer pump barrel 9, an inner pump barrel 10, and a pump core 21. The outer pump barrel 9, the inner pump barrel 10, and the pump core 21 are coaxially arranged from outside to inside. There is an annulus Ⅰ8 between the outer pump barrel 9 and the inner pump barrel 10, and there is an annulus Ⅱ17 between the inner pump barrel 10 and the pump core housing 22. The outer pump barrel 9 and the outer layer oil pipe are connected to the ground oil tree, and the inner pump barrel 10 and the inner layer oil pipe are connected to the ground oil tree.

[0024] The pump core 21 includes a pump core housing 22, a one-way valve Ⅰ11, a nozzle 13, a throat 14, and a lifting device 19. The bottom of the pump core housing 22 is a blocking structure. The righting nipple 1 and the lifting nipple 3 are connected from top to bottom to form the pump core housing 22. The inner diameter of the righting nipple 1 is smaller than the inner diameter of the lifting nipple 3; the lower part of the inner hole of the lifting nipple 3 is sequentially provided with a nozzle 13 and a throat 14 from top to bottom, and the upper part of the righting nipple 1 is provided with a one-way valve Ⅰ11 for liquid inlet from top to bottom; the lifting device 19 is arranged above the nozzle 13 in the lifting nipple 3.

[0025] The valve stem 4 of the lifting device 19 is arranged on the valve seat 6, and the body of the valve stem 4 moves up and down along the inner hole of the valve seat 6; preferably, the upper end of the valve stem 4 is a sphere or a cone; the valve seat 6 is provided with more than two axial liquid flow holes 7; the spring 5 is sleeved on the body of the valve stem 4 and the outer axial diameter of the upper end of the valve seat 6. When the liquid enters the upper part of the valve seat 6 through the axial liquid flow hole 7 of the valve seat 6, the valve stem 4 is pushed upward, and with the help of the liquid flow, the upper end of the valve stem 4 forms a seal with the straightening nipple 1, and the pump core 21 is lifted to the ground.

[0026] Furthermore, the pump core housing 22 is provided with a throat 14 , a nozzle 13 , a lifting device 19 , and a one-way valve 11 in sequence from bottom to top; preferably, the throat 14 , the nozzle 13 , and the lifting device 19 are located in the lifting short section 3 .

[0027] The pump core housing 22 above the one-way valve 11 is provided with a radial through hole I20; the pump core housing 22 between the one-way valve 11 and the lifting device 19 is provided with a radial through hole II2; the pump core housing 22 between the nozzle 13 and the throat 14 is provided with a radial through hole III23. Preferably, the number of radial through hole I20, radial through hole II2 and radial through hole III23 can be one or more, and when the number is more than one, they are evenly distributed along the circumference of the pump core housing 22.

[0028] The radial through hole I 20 , the radial through hole II 2 and the radial through hole III 23 all connect the annulus II 17 with the inner cavity of the pump core 21 .

[0029] An annular sealing ring 12 is arranged in the annulus between the inner pump barrel 10 and the pump core housing 22 between the radial through hole II2 and the radial through hole III23.

[0030] A radial through hole IV16 is provided at the corresponding position of the inner pump barrel 10 and the pump core housing 22 below the throat 14, and the radial through hole IV16 connects the annulus I8 with the inner cavity of the pump core 21. A sealing device 15 is provided between the inner pump barrel 10 and the pump core housing 22 on the side of the radial through hole IV16, to establish a passage between the annulus I8 and the inner cavity of the pump core 21, so as to achieve the purpose that the radial through hole IV16 does not directly communicate with the annulus II17. Preferably, a sealing ring is provided at the outer circumference of the radial through hole IV16 of the pump core housing 22.

[0031] The inner pump barrel 10 below the pump core housing 22 is provided with a one-way valve II 18 , and formation fluid can enter the inner pump barrel 10 through the one-way valve II 18 .

[0032] The concentric tube hydraulic jet pump of the present invention is as follows during normal oil and gas production and forced lifting of the pump core:

[0033] During normal production operation of the concentric tube hydraulic jet pump of the present invention,

[0034] The power fluid enters the inner pump barrel 10, opens the one-way valve Ⅰ11 of the pump core 21 downward through the radial through hole Ⅰ20, and pushes the valve stem 4 of the lifting device 19 downward. Then, the power fluid increases in speed through the nozzle 13, and a low-pressure area is formed in the inner cavity between the nozzle 13 and the throat 14.

[0035] At the same time, the one-way valve II18 at the bottom of the inner pump barrel 10 opens, and the formation fluid enters the inner pump barrel 10 through the one-way valve II18, and then enters the inner cavity of the pump core 21 between the nozzle 13 and the throat 14 through the radial through hole III23, and then mixes with the power fluid accelerated by the nozzle 13 and passes downward through the throat 14;

[0036] The mixed liquid passing through the throat 14 enters the annulus Ⅰ8 between the outer pump barrel 9 and the inner pump barrel 10 through the radial through hole Ⅳ16 and is discharged upwardly out of the wellbore. The mixed liquid discharged from the wellbore is output through the Christmas tree.

[0037] When the concentric tube hydraulic jet pump of the present invention is forced to lift the pump core due to pump core jamming,

[0038] The one-way valve II18 at the bottom of the inner pump barrel 10 is closed, and the power fluid is transported downhole through the annulus I8 between the outer pump barrel 9 and the inner pump barrel 10, and the power fluid enters the inner cavity of the pump core 21 through the radial through hole IV16;

[0039] The power fluid entering the inner cavity of the pump core 21 then passes through the throat 14 and the nozzle 13 upward in sequence, and enters the upper part of the valve seat 6 through the axial liquid flow hole 7 of the valve seat 6. The power fluid pushes the valve stem 7 to move upward, and the upper end of the valve stem 7 is sealed with the straightening nipple 1, and the pressure is continuously applied until the pump core 21 is lifted out of the wellbore.

[0040] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that 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 concentric tube hydraulic jet pump pump core forced lifting device, comprising an outer pump barrel, an inner pump barrel, and a pump core, wherein the outer pump barrel, the inner pump barrel, and the pump core are coaxially arranged from outside to inside, an annulus I is provided between the outer pump barrel and the inner pump barrel, and an annulus II is provided between the inner pump barrel and the pump core housing, wherein: The righting nipple and the lifting nipple are connected from top to bottom to form a pump core housing, and the inner diameter of the righting nipple is smaller than that of the lifting nipple; a nozzle and a throat are arranged at the lower part of the inner hole of the lifting nipple, and a one-way valve I for liquid intake from top to bottom is arranged at the upper part of the righting nipple; the lifting device is arranged above the nozzle in the lifting nipple.

2. The pump core forced lifting device of the concentric tube hydraulic jet pump according to claim 1 is characterized in that: The valve stem of the lifting device is arranged on the valve seat, and the rod body of the valve stem moves along the inner hole of the valve seat; the spring is sleeved on the rod body of the valve stem and the outer axial diameter of the upper end of the valve seat; when the liquid enters the upper part of the valve seat through the axial liquid flow hole of the valve seat, the valve stem is pushed upward, the upper end head of the valve stem is sealed with the straightening short joint, and the pump core is lifted to the ground.

3. The pump core forced lifting device of the concentric tube hydraulic jet pump according to claim 2 is characterized in that: The pump core housing is provided with a throat, a nozzle, a lifting device and a one-way valve in sequence from bottom to top; The pump core housing above the one-way valve is provided with a radial through hole I; the pump core housing between the one-way valve and the lifting device is provided with a radial through hole II; the pump core housing between the nozzle and the throat is provided with a radial through hole III; The radial through hole I, radial through hole II and radial through hole III all connect the annulus II with the inner cavity of the pump core.

4. The pump core forced lifting device of the concentric tube hydraulic jet pump according to claim 3 is characterized by: A radial through hole IV is provided at the corresponding position of the inner pump barrel and the pump core housing below the throat pipe, and the radial through hole IV connects the annulus I with the inner cavity of the pump core; A sealing device is arranged between the inner pump barrel on the side of the radial through hole IV and the pump core housing to establish a passage between the annulus I and the inner cavity of the pump core.

5. The pump core forced lifting device of the concentric tube hydraulic jet pump according to claim 4 is characterized in that: A sealing ring is arranged in the annulus between the inner pump barrel and the pump core housing between the radial through hole II and the radial through hole III.

6. The pump core forced lifting device of the concentric tube hydraulic jet pump according to claim 5 is characterized in that: The inner pump barrel below the pump core housing is provided with a one-way valve II, and the formation fluid enters the inner pump barrel through the one-way valve II.

7. The pump core forced lifting device of the concentric tube hydraulic jet pump according to claim 1 is characterized by: When the concentric tube hydraulic jet pump is in normal production operation, the power fluid enters the inner pump barrel, opens the one-way valve I of the pump core downward through the radial through hole I in turn, pushes down the valve stem of the lifting device, and then the power fluid increases in speed through the nozzle, forming a low-pressure area in the inner cavity between the nozzle and the throat; At the same time, the one-way valve II at the bottom of the inner pump barrel opens, and the formation fluid enters the inner pump barrel through the one-way valve II, and then enters the inner cavity of the pump core between the nozzle and the throat through the radial through hole III, and mixes with the high-speed power fluid sprayed from the nozzle and passes downward through the throat; The mixed liquid passes through the throat 14 and then enters the annulus I between the outer pump barrel and the inner pump barrel through the radial through hole IV and is discharged upward from the wellbore.

8. The pump core forced lifting device of the concentric tube hydraulic jet pump according to claim 1 is characterized in that: When the concentric tube hydraulic jet pump forcibly lifts the pump core, the one-way valve II at the bottom of the inner pump barrel is closed, and the power fluid is transported downhole through the annulus I between the outer pump barrel and the inner pump barrel, and the power fluid enters the inner cavity of the pump core through the radial through hole IV; The power fluid in the inner cavity of the pump core then passes through the throat and nozzle upward in turn, and enters the top of the valve seat through the axial liquid flow hole of the valve seat. The power fluid pushes the valve stem to move upward, and the upper end of the valve stem is sealed with the straightening nipple, and the pressure is continuously applied until the pump core is lifted out of the wellbore.

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