Rod pumped well salt flushing and production integrated tubular column
By designing an integrated pipe column for the pumping machine well to flush salt and produce, the annular structure of the outer and inner pipe components is deepened, the problem of buried oil layer of the salt bridge in the oil well is solved, and the effect of simplifying the operation process, improving production efficiency and reducing oil production costs is achieved.
Patent Information
- Application Number
- CN202421572776.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-04
AI Technical Summary
During the middle and late stages of oil wells, the oil layer may be buried in the salt bridge, resulting in the failure of the production column of the oil pump. It is necessary to specially set up the production column for the salt flushing operation. The process is complicated, which increases the cost of oil production and reduces production efficiency.
A integrated pipe column for rinsing salt and producing oil pump wells is designed. By connecting the outer pipe and inner pipe components at the lower end of the oil pump, an annular structure is formed, and the lower end of the outer pipe is close to the upper boundary of the oil layer is deepened to ensure that the salt bridge is not easy to form, and the salt operation is flushed through the backwash well when necessary.
It is possible to perform the rinsing salt operation without the need for a special next time in the oil well, which reduces the operation process, improves production efficiency, and reduces the cost of oil production.
Smart Images
Figure CN222863322U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil well production pipe strings, in particular to an integrated pipe string for pumping well salt flushing and production. Background Art
[0002] In the middle and late stages of oil well development, salt or sand production may occur, resulting in pump failure of the production string of the pumping unit, or even the phenomenon of salt or sand burying the oil layer, causing the oil well to be unable to produce normally. Figure 1 As shown in the figure, it is mainly composed of a sucker rod 11, an oil pipe 10, a pump 8, a tail pipe 7, a screen 6, a plug 5 and other components. The sucker rod 11 is connected to the pump piston 9. The casing 3 is lowered into the wellbore, and the production string is lowered into the casing 3 to a designed depth. The oil in the oil layer 2 can enter the production string through the screen 6. The pump rod 11 drives the pump piston 9 to move up and down to pump the oil to the ground. When used, Figure 1 As shown in , the average depth of the oil pump 8 is 2200 meters, the depth of the screen 6 is 2280 meters, and the depth of the plug 5 is 2300 meters. The oil layer 2 of the oil well is 3100-3600 meters deep. The plug 5 at the bottom of the production string is far away from the oil layer 2 to avoid serious sand or salt production in the formation and blockage of the screen 6, affecting the normal oil supply. For salt-forming oil wells, a salt bridge 4 is easily formed in the section of the wellbore from below the plug 5 of the production string to the bottom of the well 1. The salt bridge 4 buries the oil layer 2 and affects the normal production of the oil well. For this, it is usually necessary to first pull out the production string, and then lower the salt flushing string to perform salt flushing operations. After the salt flushing operation is completed, the salt flushing string is pulled out, and finally the production string is re-inserted to resume production, resulting in complicated operation procedures, increased oil production costs, and reduced production efficiency. Utility Model Content
[0003] The utility model aims to provide an integrated salt flushing and production string for a pumping well, so as to solve the problem that when a salt bridge burying oil layer appears in an oil well, it is necessary to pull out the production string, lower a salt flushing string to perform a salt flushing operation, and then lower the production string again, which leads to complicated operation procedures, increased oil production costs, and reduced production efficiency.
[0004] In order to achieve the above purpose, the utility model of the pumping well salt flushing and production integrated pipe string adopts the following technical solutions:
[0005] The utility model discloses an integrated pipe string for flushing salt and producing in a pumping well, comprising a sucker rod, an oil pipe and an oil pump connected to the oil pipe, wherein the lower end of the oil pump is connected with a deepening outer pipe and an inner pipe assembly, the deepening outer pipe is located outside the inner pipe assembly and an annulus is formed between the two, the lower end of the deepening outer pipe extends downwardly beyond the lower end of the inner pipe assembly and is used to be lowered to a position close to the upper boundary of the oil layer, the lower end pipe opening of the deepening outer pipe forms a reflux port for backwashing fluid to enter, the inner pipe assembly is connected with the oil inlet of the oil pump, the bottom of the inner pipe assembly is blocked, and the inner pipe assembly is provided with a fluid channel connecting the inner cavity of the inner pipe assembly and the annulus.
[0006] Beneficial effects: The utility model is an improved invention based on the existing production string of the oil pumping unit. The oil pipe is used as the oil delivery channel, the sucker rod is connected to the oil pump piston, and the sucker rod cooperates with the oil pump to pump the oil in the oil layer to the ground. On this basis, the lower end of the oil pump is connected with a deepening outer pipe and an inner pipe assembly, and the deepening outer pipe is located outside the inner pipe assembly to form an annulus between the two. After the oil in the oil layer enters the casing, it first enters the annulus of the deepening outer pipe and the inner pipe assembly through the lower end pipe opening of the deepening outer pipe, and enters the inner cavity of the inner pipe assembly through the fluid channel on the inner pipe assembly, and then continues to enter the oil pump and the oil pipe to be transported to the ground. When used, the tubing string (excluding the sucker rod and the oil pump piston) is connected and then lowered into the wellbore to the designed depth. The tubing string above the oil pump is pressure tested. After the pressure test is qualified, the sucker rod is connected to the oil pump piston and lowered into the tubing string together. Since the lower end of the deepening outer tube extends downward beyond the lower end of the inner tube assembly, the inner tube assembly is far away from the oil layer after the tubing string is lowered into the wellbore to the designed depth, thereby protecting the fluid channel on the inner tube assembly from being blocked, and the lower end of the deepening outer tube is close to the upper boundary of the oil layer, thereby ensuring that a salt bridge is not easily formed in the wellbore between the bottom of the deepening outer tube and the oil layer. During normal oil production, the oil in the oil layer enters the casing and first enters the annulus between the deepening outer tube and the inner tube assembly, and enters the inner cavity of the inner tube assembly through the fluid channel on the inner tube assembly, and then continues to be transported to the ground through the oil pump and the oil pipe. At this time, the tubing string serves as a production line. Use of tubing string; when salt bridge is found to be formed in the wellbore, only the sucker rod and the oil pump piston need to be pulled out to carry out backwash well and flush salt operation. The flushing fluid enters from the annulus of the oil casing. Since the lower end of the deepening outer pipe is close to the upper boundary of the oil layer, and the salt bridge is not far from the upper side of the oil layer, the lower end of the deepening outer pipe and the salt bridge are close to each other, which can ensure that the pressurized flushing fluid has a strong impact on the salt bridge after entering from the annulus of the oil casing, thereby ensuring the flushing effect of the salt bridge. The flushing fluid carries the flushed impurities into the annulus of the deepening outer pipe and the inner pipe assembly through the lower end pipe opening of the deepening outer pipe, and enters the inner cavity of the inner pipe assembly through the fluid channel on the inner pipe assembly, and then continues to pass through the oil pump and the oil pipe and returns to the ground. At this time, the tubing string is used as a salt flushing tubing string; after the salt flushing operation is completed, the sucker rod and the oil pump piston are re-lowered into the tubing string to resume production. The utility model discloses an integrated salt flushing and production pipe string for a pumping well, which takes into account the functions of a production pipe string and a salt flushing pipe string. When a salt bridge buried oil layer is formed in the wellbore, there is no need to specially flush the salt pipe string, and the salt flushing operation can be carried out, thereby reducing the operation process, improving the production efficiency and reducing the oil production cost.
[0007] Furthermore, the inner tube assembly includes a central tube, a screen tube connected to the central tube and a wire plug; the upper end of the central tube is connected to the oil pump; and the screen holes on the screen tube constitute the fluid channel.
[0008] Furthermore, a flushing head is provided at the bottom of the deepened outer pipe, and the flushing head has a downward pointed tip structure for piercing the salt bridge when the pipe string is lowered.
[0009] Furthermore, the flushing head is an oblique tip.
[0010] Furthermore, the flushing head is detachably connected to the deepening outer tube.
[0011] Furthermore, the deepened outer tube, the inner tube assembly and the oil pipe are coaxially arranged.
[0012] Furthermore, a joint is connected to the lower end of the oil pump, and the oil pump is connected to the inner pipe assembly and the deepened outer pipe through the joint.
[0013] Furthermore, the joint is threadedly connected to the inner tube assembly and the deepened outer tube.
[0014] Further, the outer pipe is deepened to have the same size as the oil pipe.
[0015] Furthermore, the oil pump is a bridge oil pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the existing pumping unit production string after it is lowered into the wellbore to the designed depth;
[0017] Figure 2 This is a schematic diagram of the utility model of the integrated pipe string for pumping well salt flushing and production after being lowered into the wellbore to the designed depth (the salt bridge is not shown in the figure);
[0018] In the figure: 1, bottom of the well; 2, oil layer; 3, casing; 4, salt bridge; 5, wire plug; 6, screen tube; 7, tail pipe; 8, oil pump; 9, oil pump piston; 10, oil pipe; 11, sucker rod; 12, flushing head; 13, outer pipe; 14, center pipe. DETAILED DESCRIPTION
[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.
[0020] When the existing production string of the oil pump is used, in order to avoid the clogging of the screen tube due to serious sand or salt production in the formation, the wire plug at the bottom of the production string is far away from the oil layer, and a salt bridge is easily formed in the wellbore from below the wire plug to the bottom of the well, burying the oil layer, affecting the normal production of the oil well. The production string needs to be pulled out and a salt flushing string needs to be specially lowered to flush the salt, which makes the operation process complicated, increases the oil production cost, and reduces the production efficiency.
[0021] In order to solve this problem, the utility model proposes an integrated pipe string for flushing salt and production in an oil well pumping machine, which can avoid the need for a special trip to flush the salt pipe string. The specific scheme principle is: a deepening outer pipe and an inner pipe assembly are connected at the lower end of the oil well pump, the deepening outer pipe is located outside the inner pipe assembly and an annulus is formed between the two, the lower end of the deepening outer pipe goes downwardly beyond the lower end of the inner pipe assembly, the lower end pipe opening of the deepening outer pipe forms a reflux port for backwashing fluid to enter and an inlet for oil fluid to enter, the inner pipe assembly is connected to the oil inlet of the oil well pump, the bottom of the inner pipe assembly is blocked, and the inner pipe assembly is connected to the oil well pump. The component is provided with a fluid passage connecting the inner cavity of the inner tube assembly and the annulus. After the pipe string is lowered into the wellbore to the designed depth, the lower end of the outer pipe is deepened to be close to the upper boundary of the oil layer, thereby ensuring that a salt bridge is not easily formed in the wellbore between the bottom of the outer pipe and the oil layer. During normal oil production, the pipe string is used as a production pipe string. When a salt bridge is found to be formed in the wellbore, only the sucker rod and the pump piston need to be pulled out to perform backwashing of the well and flushing of salt; after the salt flushing operation is completed, the sucker rod and the pump piston are re-lowered into the pipe string to resume production. Therefore, when a salt bridge is formed in the wellbore to bury the oil layer, there is no need to specially flush the salt pipe string, and the salt flushing operation can be performed, thereby achieving the purpose of reducing the operation process, improving production efficiency, and reducing oil production costs.
[0022] Based on the principle of the above scheme, the embodiment of the utility model of the integrated pipe string for pumping well salt flushing and production is specifically introduced below.
[0023] like Figure 2 As shown, the integrated string for flushing salt and production of pumping wells is lowered into the wellbore to a designed depth when in use, a casing 3 is lowered into the wellbore, and the bottom of the well 1 is located at the lower side of the oil layer 2. The integrated string for flushing salt and production of pumping wells includes a sucker rod 11, an oil pipe 10, and an oil pump 8 connected to the oil pipe 10. The lower end of the oil pump 8 is connected to a deepening outer pipe 13 and an inner pipe assembly. The deepening outer pipe 13 is located outside the inner pipe assembly and an annulus is formed between the two. The lower end of the deepening outer pipe 13 extends downward beyond the lower end of the inner pipe assembly and is used to be lowered to a position close to the upper boundary of the oil layer 2. The lower end of the deepening outer pipe 13 forms a reflux port for backwashing fluid to enter and an inlet for oil fluid to enter. The oil pump 8 includes components such as a pump barrel, a suction valve, a discharge valve, and an oil pump piston 9. The suction valve has an oil inlet, and the discharge valve is installed on the oil pump piston 9. The discharge valve has an oil outlet. After the pump barrel and the suction valve are assembled on the ground, they are lowered into the wellbore together with the oil pipe 10, and then the oil pump piston 9 is connected to the sucker rod 11 and lowered into the pump. The inner tube assembly has an inner tube assembly cavity for fluid to pass through, and the inner tube assembly cavity is connected to the oil inlet of the oil pump 8. The bottom of the inner tube assembly is blocked, and the inner tube assembly is provided with a fluid channel connecting the inner tube assembly cavity and the external annulus, so that the fluid in the external annulus can enter the inner tube assembly through the fluid channel, and then enter the pump through the oil inlet of the oil pump 8.
[0024] Specifically, Figure 2 As shown in the figure, the inner tube assembly includes a central tube 14, a screen tube 6 and a plug 5 connected to the central tube 14. The bottom of the inner tube assembly is blocked by connecting the plug 5 at the bottom. The upper end of the central tube 14 is connected to the oil pump 8. The inner cavity of the central tube 14 is connected to the oil inlet of the oil pump 8. When the suction valve of the oil pump 8 is opened, the fluid in the inner cavity of the central tube 14 can enter the oil pump 8 through the oil inlet. The sieve holes on the screen tube 6 constitute a fluid channel connecting the inner cavity of the inner tube assembly with the external annulus, so that the fluid in the external annulus can enter the inner tube assembly through the sieve holes on the screen tube 6. One of the main purposes of setting the screen tube 6 and the plug 5 is to filter the rubber fragments of the packer and other debris to prevent the debris in the wellbore from entering the pump barrel and affecting the performance and service life of the pump. Of course, in other embodiments, a separate screen tube 6 may no longer be used. For example, a through hole may be directly opened on the wall of the central tube 14 as a fluid passage connecting the inner cavity of the inner tube assembly and the external annulus. On this basis, a separate wire plug 5 may no longer be provided, so that the bottom of the central tube 14 can be a sealed structure. Alternatively, the wire plug 5 may no longer be provided, but a plug may be provided at the bottom of the central tube 14, and the plug may be welded and fixed to the bottom of the central tube 14 to seal the bottom of the central tube 14.
[0025] Preferably, if Figure 2 As shown in , the deepened outer tube 13 and the inner tube assembly below the oil pump 8 are coaxially arranged with the oil pipe 10 above. In this way, on the one hand, it can ensure that the center of gravity of the deepened outer tube 13, the inner tube assembly and the oil pipe 10 are on the same straight line, thereby ensuring that the overall balance is maintained during the lifting and lowering of the pipe string, and it is not easy to tilt and collide. On the other hand, it is conducive to ensuring the uniform pumping of oil in the pipe string during normal production and the smooth pumping process. Of course, it is also conducive to ensuring the uniform return of flushing liquid in the pipe string during salt flushing operations. Of course, in other embodiments, the central axis of the deepened outer tube 13 and the inner tube assembly can also be staggered, and the central axis of the deepened outer tube 13 and the oil pipe 10 can also be staggered.
[0026] More preferably, the size of the deepening outer tube 13 below the oil pump 8 is the same as that of the oil pipe 10 above. The advantages of such a setting are, first, that the overall radial size of the pipe string will not be increased, thus avoiding any trouble or increased difficulty in lowering the pipe string into the wellbore as a whole; second, the deepening outer tube 13 can use the existing oil pipe 10 in the oil field, which is more convenient for on-site material collection and assembly. Of course, in other embodiments, the size of the deepening outer tube 13 and the oil pipe 10 can also be different, for example, the outer diameter of the deepening outer tube 13 is smaller than or larger than the outer diameter of the oil pipe 10. Of course, it is understandable that the outer diameter of the deepening outer tube 13 cannot differ too much from the outer diameter of the oil pipe 10, so as to avoid the outer diameter of the deepening outer tube 13 being too large, which increases the difficulty of lowering the pipe string, or the outer diameter of the deepening outer tube 13 being too small, which leads to a smaller annulus between the deepening outer tube 13 and the inner pipe assembly, thereby causing the fluid to flow into the annulus and continue to flow into the inner pipe assembly. The flow rate slows down, affecting the efficiency of oil production or salt flushing operations.
[0027] In order to further improve the efficiency of salt flushing, a flushing head 12 is provided at the bottom of the deepened outer tube 13. The flushing head 12 has a downward pointed structure. During the salt flushing operation, the pipe column can be controlled to be lowered so that the pointed structure of the flushing head 12 collides with the salt bridge and penetrates the salt bridge, thereby accelerating the rupture of the salt bridge and cooperating with the flushing effect of the pressurized flushing liquid to improve the flushing efficiency. In one preferred embodiment, the flushing head 12 is an oblique pointed structure, such as Figure 2 As shown in . The oblique tip structure is easy to process and shape, and when it collides with the salt bridge, it can produce a sharper cone thorn on the salt bridge, and the crushing effect is better. Of course, in other embodiments, the flushing head 12 can also be a serrated head, and the saw teeth of the serrated head collide with the salt bridge and pierce the salt bridge, which can also produce a better crushing effect on the salt bridge; the flushing head 12 can also be a conical head, and the cone tip of the conical head is used to cone-pierce and crush the salt bridge. Of course, in specific applications, the flushing head 12 can also be not set at the bottom of the deepened outer tube 13. At this time, the salt bridge is mainly flushed and crushed by the impact force of the pressurized flushing liquid.
[0028] In a preferred embodiment, the flushing head 12 is detachably connected to the deepening outer tube 13, and a threaded connection is specifically adopted to facilitate the separate processing and disassembly and replacement of the flushing head 12. Of course, the flushing head 12 and the deepening outer tube 13 can also be fixedly connected by bolts; or, the flushing head 12 can also be welded to the deepening outer tube 13.
[0029] In this embodiment, a joint is connected to the lower end of the oil pump 8, and the oil pump 8 is connected to the inner tube assembly and the deepened outer tube 13 through the joint. The joint has a first thread adapted to the inner tube assembly and a second thread adapted to the deepened outer tube 13. The joint is threadedly connected to the inner tube assembly and the deepened outer tube 13, which is convenient for connection and also convenient for replacing the inner tube assembly and the deepened outer tube 13 separately. Of course, if the connection structure provided at the lower end of the oil pump 8 can simultaneously connect the inner tube assembly and the deepened outer tube 13, the joint may not be provided, and the lower end of the oil pump 8 may be directly connected to the inner tube assembly and the deepened outer tube 13. Of course, when the lower end of the oil pump 8 is connected to the inner tube assembly and the deepened outer tube 13 through the joint, the joint and the inner tube assembly and the deepened outer tube 13 may also be welded, or relatively fixed by bolts, pins, etc.
[0030] In this embodiment, the oil pump 8 adopts a bridge oil pump. The lower end of the bridge oil pump is connected to the inner tube assembly and the deepened outer tube through a joint. The gravity of the inner tube assembly and the deepened outer tube acts on the bridge oil pump. The bridge oil pump can withstand a large weight of the pipe column without being easily damaged, and has better safety.
[0031] When the utility model is used for the integrated pipe string for flushing salt and producing in a pumping well, the pipe string (excluding the sucker rod 11 and the oil pump piston 9) is first connected on the ground, and after all the connections are completed, it is lowered into the wellbore to a designed depth, and the pipe string above the oil pump 8 is pressure tested. After the pressure test is qualified, the sucker rod 11 is connected with the oil pump piston 9 and lowered into the pipe string together. Since the lower end of the deepening outer pipe 13 is downwardly extended beyond the lower end of the inner pipe assembly, the lower end of the inner pipe assembly is far away from the oil layer 2 after the pipe string is lowered into the wellbore to a designed depth, thereby protecting the fluid channel on the inner pipe assembly from being blocked, and the lower end of the deepening outer pipe 13 is close to the upper boundary position of the oil layer 2, thereby ensuring that a salt bridge is not easily formed in the wellbore between the bottom of the deepening outer pipe 13 and the oil layer 2.
[0032] During normal oil production, the oil in the oil layer 2 enters the casing 3 and first enters the annulus between the deepening outer pipe 13 and the inner pipe assembly through the lower end of the deepening outer pipe, and enters the inner cavity of the inner pipe assembly through the fluid channel on the inner pipe assembly, and then continues to be transported to the ground through the oil pump 8 and the oil pipe 10. At this time, the pipe string is used as a production pipe string; when a salt bridge is found to be formed in the wellbore ( Figure 2When the pump is in the well, the pump rod 11 and the pump piston 9 are pulled out, and the backwash well can be backwashed and the salt can be flushed. The flushing liquid enters from the oil casing annulus at the wellhead. Since the lower end of the deepening outer tube 13 is close to the upper boundary of the oil layer 2, and the salt bridge is not far from the upper side of the oil layer 2, the lower end of the deepening outer tube 13 and the salt bridge are close to each other, which can ensure that the pressurized flushing liquid has a strong impact on the salt bridge after entering from the oil casing annulus, thereby ensuring the flushing effect of the salt bridge. The flushing liquid carries the flushed impurities through the lower end of the deepening outer tube and enters the annular space between the deepening outer tube 13 and the inner tube assembly. The fluid in the inner pipe assembly is empty and enters the inner cavity of the inner pipe assembly through the fluid channel on the inner pipe assembly, and then continues to pass through the oil pump 8 and the oil pipe 10 to return to the ground. At this time, the pipe string is used as a salt flushing pipe string. It should be noted here that after the sucker rod 11 and the oil pump piston 9 are lifted out, the pipe string can be lowered for a distance so that the flushing head 12 at the lower end of the deepening outer pipe 13 can impact the salt bridge, and cooperate with the flushing effect of the pressurized flushing fluid to improve the efficiency of the salt flushing operation; after the salt flushing operation is completed, the sucker rod 11 and the oil pump piston 9 are re-lowered in the pipe string to resume production.
[0033] The utility model discloses the integrated salt flushing and production pipe string for oil pumping well can be used as the production pipe string when the oil well is producing normally, and can also form a salt bridge to bury the oil layer in the wellbore, and can be used as the salt flushing pipe string when the salt flushing operation is needed, without the need for a special trip to flush the salt pipe string, and the salt flushing operation can be carried out without the original well pipe string, thereby reducing the operation process, improving the production efficiency and reducing the oil production cost.
[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.
Claims
1. A pumping well salt flushing and production integrated pipe string, comprising a sucker rod, an oil pipe and an oil pump connected to the oil pipe, characterized in that: The lower end of the oil pump is connected to a deepening outer tube and an inner tube assembly. The deepening outer tube is located on the outside of the inner tube assembly to form an annulus between the two. The lower end of the deepening outer tube extends downward beyond the lower end of the inner tube assembly and is used to be lowered to a position close to the upper boundary of the oil layer. The lower end pipe opening of the deepening outer tube forms a reflux port for backwashing fluid to enter. The inner tube assembly is connected to the oil inlet of the oil pump, the bottom of the inner tube assembly is blocked, and the inner tube assembly is provided with a fluid channel connecting the inner cavity of the inner tube assembly with the annulus.
2. The integrated salt flushing and production string for pumping wells according to claim 1, characterized in that: The inner tube assembly comprises a central tube, a screen tube connected to the central tube and a wire plug; the upper end of the central tube is connected to the oil pump; the screen holes on the screen tube constitute the fluid channel.
3. The integrated salt flushing and production string for pumping wells according to claim 1, characterized in that: A flushing head is arranged at the bottom of the deepened outer pipe. The flushing head has a downward pointed tip structure for piercing the salt bridge when the pipe string is lowered.
4. The integrated salt flushing and production string for pumping wells according to claim 3, characterized in that: The flushing head has an oblique tip.
5. The integrated salt flushing and production string for pumping wells according to claim 3 or 4, characterized in that: The flushing head is detachably connected to the deepened outer tube.
6. The integrated salt flushing and production string for pumping wells according to claim 1 or 2, characterized in that: The deepened outer tube, the inner tube assembly and the oil pipe are coaxially arranged.
7. The integrated salt flushing and production string for pumping wells according to claim 1 or 2, characterized in that: A joint is connected to the lower end of the oil pump, and the oil pump is connected to the inner pipe assembly and the deepened outer pipe through the joint.
8. The integrated salt flushing and production string for pumping wells according to claim 7, characterized in that: The joint is threadedly connected with the inner pipe assembly and the deepened outer pipe.
9. The integrated salt flushing and production string for pumping wells according to claim 1, characterized in that: The outer tube is deepened to the same size as the oil pipe.
10. The integrated salt flushing and production string for pumping wells according to claim 1, characterized in that: The oil pump is a bridge oil pump.