阅读说明：本技术 工艺管柱 (Process pipe column ) 是由 韩涛 韩岐清 赖学明 赵留阳 陈锐 郑小雄 于 2020-03-24 设计创作，主要内容包括：本申请公开了一种工艺管柱,属于油气开采领域。该工艺管柱由上至下依次包括：油管、采油机组、油水分离器、注水机组和止逆元件,采油机组包括第一潜油螺杆泵和第一导流管。油管的第一端用于固定在油气井的井口,油管的第二端通过止逆元件与第一潜油螺杆泵的第一端连接,第一潜油螺杆泵的第二端伸入第一导流管,油水分离器的出水口与注水机组的一端连接。第一潜油螺杆泵用于沿第一导流管抽吸分离得到的石油,并沿油管举升至地表,注水机组用于将分离得到的地层水注入注水层。通过本申请提供的工艺管柱,可以在油井内实现油水的分离,并将分离得到石油举升至地表,将分离得到的地层水注入注水层,因而降低了人员的劳动强度。(The application discloses technology tubular column belongs to the oil and gas exploitation field. The process pipe column sequentially comprises from top to bottom: the oil extraction unit comprises a first submersible screw pump and a first flow guide pipe. The first end of the oil pipe is used for being fixed at a wellhead of an oil-gas well, the second end of the oil pipe is connected with the first end of the first submersible screw pump through the non-return element, the second end of the first submersible screw pump extends into the first flow guide pipe, and the water outlet of the oil-water separator is connected with one end of the water injection unit. The first submersible screw pump is used for pumping the separated petroleum along the first flow guide pipe and lifting the petroleum to the ground surface along the oil pipe, and the water injection unit is used for injecting the separated stratum water into the water injection layer. Through the process pipe column provided by the application, the oil-water separation can be realized in an oil well, the separated petroleum is lifted to the ground surface, and the separated stratum water is injected into the water injection layer, so that the labor intensity of personnel is reduced.)

1. The utility model provides a technology tubular column, its characterized in that, technology tubular column includes from top to bottom in proper order: the oil extraction unit (2) comprises a first submersible screw pump (21) and a first flow guide pipe (22);

the first end of the oil pipe (1) is used for being fixed at a wellhead of an oil-gas well, the second end of the oil pipe (1) is connected with the first end of the first submersible screw pump (21) through the check element (5), the second end of the first submersible screw pump (21) extends into the first flow guide pipe (22) and is sealed in the first flow guide pipe (22), one end, far away from the oil pipe (1), of the first flow guide pipe (22) is communicated with an oil outlet of the oil-water separator (3), a water outlet of the oil-water separator (3) is connected with one end of the water injection unit (4), and the oil pipe (1), the first submersible screw pump (21), the first flow guide pipe (22), the oil-water separator (3) and the water injection unit (4) are all located in an inner cavity of the sleeve (01);

the oil-water separator (3) is used for separating an oil-water mixture in an inner cavity of the casing (01), the first submersible screw pump (21) is used for pumping oil obtained by separation of the oil-water separator (3) along the first guide pipe (22) and lifting the oil to the ground along the oil pipe (1), the non-return element (5) is used for preventing the oil lifted to the ground from falling back to the first submersible screw pump (21), and the water injection unit (4) is used for injecting formation water obtained by separation of the oil-water separator (3) into a water injection layer.

2. A process pipe column according to claim 1, characterized in that the oil-water separator (3) is a conical tubular structure, the cross-sectional area of the oil outlet is larger than that of the water outlet, and a first liquid inlet hole (31) is arranged at one end of the oil-water separator (3) close to the oil outlet.

3. A process column according to claim 2, wherein the centre line of the first inlet opening (31) is tangential to the outer surface of the separator (3) and perpendicular to the centre line of the separator (3).

4. The process string according to claim 1, wherein the first submersible screw pump (21) comprises: the first screw pump (211), the first motor (212) and the first coupling (213);

the first end of the first screw pump (211) is connected with the inlet end of the non-return element (5), the second end of the first screw pump (211) is connected with the motor shaft of the first motor (212) through the first coupler (213), the second end of the first screw pump (211) is also connected with one end of the first flow guide pipe (22), and the first coupler (213) and the first motor (212) are positioned in the first flow guide pipe (22);

and a second liquid inlet hole (2131) is formed in the first coupling (213), and the second liquid inlet hole (2131) is communicated with the central hole of the first coupling (213) and the first guide pipe (22).

5. The process string according to claim 4, wherein the first submersible screw pump (21) further comprises: a first motor protector (214), the first motor protector (214) being connected in series between the first motor (212) and the first coupling (213).

6. A process string according to claim 1, characterised in that the water injection assembly (4) comprises: a second submersible screw pump (41) and a second flow guide pipe (42);

the first end of the second flow guide pipe (42) is communicated with the water outlet of the oil-water separator (3), one end of the second submersible screw pump (41) extends into the second flow guide pipe (42) and is sealed in the second flow guide pipe (42), and the second submersible screw pump (41) is used for pumping formation water obtained by separation of the oil-water separator (3) along the second flow guide pipe (42) and injecting a water injection layer.

7. The process string according to claim 6, wherein the second submersible screw pump (41) comprises: a second screw pump (411), a second coupling (412), and a second motor (413);

the first end of the second screw pump (411) is connected with the motor shaft of the second motor (413) through the second coupling (412), the first end of the second screw pump (411) is also connected with the second end of the second flow guide pipe (42), and the second coupling (412) and the second motor (413) are positioned in the second flow guide pipe (42);

and a third liquid inlet hole (4121) is formed in the second coupling (412), and the third liquid inlet hole (4121) is communicated with the central through hole of the second coupling (412) and the second guide pipe (42).

8. The process string according to claim 7, wherein the second submersible screw pump (41) further comprises: a second motor protector (414), the second motor protector (414) being connected in series between the second motor (413) and the second coupling (412).

9. The process column of claim 7 or 8, further comprising: a packer (6);

the packer (6) is sleeved at the second end of the second screw pump (411) and used for packing the inner cavity of the casing pipe (01), the upper layer space obtained by packing can be communicated with the reservoir in the oil-gas well, and the lower layer space obtained by packing can be communicated with the water injection layer in the oil-gas well.

10. The process column of claim 7 or 8, further comprising: a packer (6) and a cannula (7);

one end of the insertion pipe (7) is communicated with the second end of the water injection screw pump, the packer (6) is sleeved at the second end of the insertion pipe (7) and used for packing the inner cavity of the sleeve (01), the upper layer space obtained by packing can be communicated with the reservoir in the oil-gas well, and the lower layer space obtained by packing can be communicated with the water injection layer in the oil-gas well.

Technical Field

The application relates to the field of oil and gas exploitation, in particular to a process pipe column.

Background

At present, the domestic dominant oil field enters the later stage of high water content development, the average water content of petroleum in an oil well can reach more than 90 percent, after the high water content petroleum is lifted to the ground surface, the high water content petroleum is generally processed by a gathering and transportation processing system to separate the petroleum and formation water, then the petroleum is stored, and the formation water is injected into the formation through a formation water reinjection system. However, on the one hand, the labor intensity of personnel is high in the process of injecting the formation water into the formation through the formation water reinjection system, and on the other hand, the economic cost of the formation water reinjection system is high, so that economic waste is caused.

Disclosure of Invention

The application provides a technology tubular column, can solve the big problem of personnel intensity of labour. The technical scheme is as follows:

the application provides a technology tubular column, technology tubular column includes from top to bottom in proper order: the oil extraction unit comprises a first submersible screw pump and a first flow guide pipe;

the first end of the oil pipe is used for being fixed at a wellhead of an oil-gas well, the second end of the oil pipe is connected with the first end of the first submersible screw pump through the non-return element, the second end of the first submersible screw pump extends into the first flow guide pipe and is sealed in the first flow guide pipe, one end, far away from the oil pipe, of the first flow guide pipe is communicated with an oil outlet of the oil-water separator, a water outlet of the oil-water separator is connected with one end of the water injection unit, and the oil pipe, the first submersible screw pump, the first flow guide pipe, the oil-water separator and the water injection unit are all located in an inner cavity of a sleeve;

the oil-water separator is used for separating an oil-water mixture in the inner cavity of the sleeve, the first submersible screw pump is used for pumping the oil separated by the oil-water separator along the first guide pipe and lifting the oil to the ground surface along the oil pipe, the non-return element is used for preventing the oil lifted to the ground surface from falling back to the first submersible screw pump, and the water injection unit is used for injecting the formation water separated by the oil-water separator into the water injection layer.

Optionally, the oil-water separator is of a conical cylindrical structure, the sectional area of the oil outlet is larger than that of the water outlet, and a first liquid inlet hole is formed in one end, close to the oil outlet, of the oil-water separator.

Optionally, a center line of the first liquid inlet hole is tangent to an outer surface of the oil-water separator and perpendicular to the center line of the oil-water separator.

Optionally, the first submersible screw pump comprises: the first screw pump, the first motor and the first coupling;

the first end of the first screw pump is connected with the inlet end of the non-return element, the second end of the first screw pump is connected with a motor shaft of the first motor through the first coupler, the second end of the first screw pump is further connected with one end of the first flow guide pipe, and the first coupler and the first motor are positioned in the first flow guide pipe;

and a second liquid inlet hole is formed in the first coupler and communicated with the central hole of the first coupler and the first flow guide pipe.

Optionally, the first submersible screw pump further comprises: the first motor protector is connected between the first motor and the first coupler in series.

Optionally, the water injection unit comprises: the second submersible screw pump and the second flow guide pipe;

the first end of the second flow guide pipe is communicated with the water outlet of the oil-water separator, one end of the second submersible screw pump extends into the second flow guide pipe and is sealed in the second flow guide pipe, and the second submersible screw pump is used for pumping formation water obtained by the separation of the oil-water separator along the second flow guide pipe and injecting the formation water into a water injection layer.

Optionally, the second submersible screw pump comprises: the second screw pump, the second coupling and the second motor;

the first end of the second screw pump is connected with the motor shaft of the second motor through the second coupling, the first end of the second screw pump is also connected with the second end of the second flow guide pipe, and the second coupling and the second motor are positioned in the second flow guide pipe;

and a third liquid inlet hole is formed in the second coupling and is communicated with the central through hole of the second coupling and the second guide pipe.

Optionally, the second submersible screw pump further comprises: and the second motor protector is connected between the second motor and the second coupling in series.

Optionally, the process column further comprises: a packer;

the packer is sleeved at the second end of the second screw pump and used for packing the inner cavity of the sleeve, the upper layer space obtained by packing can be communicated with the reservoir in the oil-gas well, and the lower layer space obtained by packing can be communicated with the water injection layer in the oil-gas well.

Optionally, the process column further comprises: a packer and a cannula;

one end of the insertion pipe is communicated with the second end of the water injection screw pump, the packer is sleeved at the second end of the insertion pipe and used for packing the inner cavity of the sleeve, the upper layer space obtained by packing can be communicated with the reservoir in the oil-gas well, and the lower layer space obtained by packing can be communicated with the water injection layer in the oil-gas well.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least can comprise:

this application separates the water oil mixture in the cover through oil water separator to obtain oil and formation water, on the one hand, keep away from oil pipe's one end and oil-out intercommunication of oil water separator on the first honeycomb duct, the second end of the screw pump of diving into oil stretches into first honeycomb duct, and seal in first honeycomb duct, consequently, the oil of separating can get into in first honeycomb duct under the suction of the screw pump of diving into oil under this to through the entry end of non-return element, behind non-return element's the exit end, lift to the earth's surface along oil pipe. That is, the process column has a function of separating oil from water in crude oil containing water in an oil well, lifting the separated oil to the surface of the earth, and preventing the oil lifted to the surface of the earth from falling back to the first submersible screw pump. On the other hand, the water outlet of the oil-water separator is connected with one end of the water injection unit, and the water injection unit is used for injecting the formation water obtained by the separation of the oil-water separator into the water injection layer. That is, the process column has the function of injecting the separated formation water into the water injection layer. In addition, because the oil pipe, the first submersible screw pump, the first flow guide pipe, the oil-water separator and the water injection unit are all positioned in the inner cavity of the sleeve, namely, the function of lifting the oil to the ground surface and the function of injecting the formation water into the water injection layer are all realized in the inner cavity of the sleeve, in other words, the functions of lifting the oil to the ground surface and injecting the formation water into the water injection layer are realized in the oil well at the same time, therefore, the phenomenon that the oil-water mixture is lifted to the ground surface and the formation water obtained by separation is injected into the formation after the oil-water separation is carried out on the ground surface is avoided through the process pipe column provided by the application, and further, the high labor intensity of personnel brought in the process of injecting water into the formation from the ground surface is avoided. In addition, under the action of the non-return element included in the process string provided by the application, the phenomenon that the petroleum lifted to the surface falls back to the first submersible screw pump can be avoided, and therefore, the capacity of lifting the petroleum to the surface is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a process column according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of an oil-water separator according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a first submersible screw pump provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a second submersible screw pump provided in the embodiments of the present application;

FIG. 5 is a schematic diagram of another process column according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of yet another process column according to an embodiment of the present disclosure.

Reference numerals:

01: a sleeve;

1: an oil pipe; 2: an oil extraction unit; 3: an oil-water separator; 4: a water injection unit; 5: a non-return element; 6: a packer; 7: inserting a tube;

21: a first submersible screw pump; 22: a first draft tube; 31: a first liquid inlet hole; 41: a second submersible screw pump; 42: a second draft tube;

211: a first screw pump; 212: a first motor; 213: a first coupling; 214: a first motor protector; 411: a second screw pump; 412: a second coupling; 413: a second motor; 414: a second motor protector;

2131: a second liquid inlet hole; 4121: and a third liquid inlet hole.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a process column according to an embodiment of the present disclosure. Referring to fig. 1, the process column may include, in order from top to bottom: the oil extraction unit 2 comprises a first submersible screw pump 21 and a first flow guide pipe 22. The first end of oil pipe 1 is used for fixing at the well head of oil gas well, the second end of oil pipe 1 is connected with the first end of the first oil-submersible screw pump 21 through check element 5, the second end of the first oil-submersible screw pump 21 stretches into first honeycomb duct 22, and seal in first honeycomb duct 22, the one end of keeping away from oil pipe 1 on the first honeycomb duct 22 communicates with the oil-out of oil water separator 3, the delivery port of oil water separator 3 is connected with the one end of water injection unit 4, oil pipe 1, the first oil-submersible screw pump 21, first honeycomb duct 22, oil water separator 3 and water injection unit 4 all are located the inner chamber of sleeve pipe 01. The oil-water separator 3 is used for separating an oil-water mixture in an inner cavity of the casing 01, the first submersible screw pump 21 is used for pumping oil separated by the oil-water separator 3 along the first guide pipe 22 and lifting the oil to the ground surface along the oil pipe 1, the non-return element 5 is used for preventing the oil lifted to the ground surface from falling back to the first submersible screw pump 21, and the water injection unit 4 is used for injecting formation water separated by the oil-water separator 3 into a water injection layer.

This application separates the oil-water mixture in the sleeve through oil water separator 3 to obtain oil and formation water, on the one hand, the one end of keeping away from oil pipe on the first honeycomb duct 22 communicates with oil-out of oil water separator 3, the second end of the first screw pump 21 of diving stretches into first honeycomb duct 22, and sealed in first honeycomb duct 22, consequently, the oil of separating can get into in the first honeycomb duct 22 under the suction of the first screw pump 21 of diving to with this through check member 5's entry end, check member 5's exit end after, lift to the earth's surface along oil pipe 1. That is, the process string has a function of separating oil and water from crude oil containing water in an oil well, lifting the separated oil to the surface, and preventing the oil lifted to the surface from falling back to the first submersible screw pump 21. On the other hand, because the water outlet of the oil-water separator 3 is connected with one end of the water injection unit 4, the water injection unit 4 is used for injecting the formation water obtained by the separation of the oil-water separator 3 into the water injection layer. That is, the process column has the function of injecting the separated formation water into the water injection layer. In addition, because the oil pipe 1, the first submersible screw pump 21, the first flow guide pipe 22, the oil-water separator 3 and the water injection unit 4 are all positioned in the inner cavity of the casing, that is, the function of lifting oil to the ground surface and the function of injecting formation water into the water injection layer are both realized in the inner cavity of the casing, in other words, the functions of lifting oil to the ground surface and injecting formation water into the water injection layer are simultaneously realized in an oil well, therefore, the phenomenon that an oil-water mixture is lifted to the ground surface and the separated formation water is injected into the formation after oil-water separation is carried out on the ground surface is avoided through the process pipe column provided by the application, and further, the high labor intensity of personnel brought in the process of injecting water into the formation from the ground surface is avoided. In addition, the process string provided by the present application can prevent the oil lifted to the surface from falling back to the first submersible screw pump 21 by the check member 5, thereby improving the ability to lift the oil to the surface.

Specifically, an oil-water mixture produced from the reservoir enters the casing under the formation pressure and then enters the oil-water separator 3, so that the oil-water mixture is separated by the oil-water separator 3, and further, oil on the upper layer and formation water on the lower layer are obtained. The separated oil then enters the first flow conduit 22 and can be lifted to the surface along the tubing 1 by the first submersible screw pump 21. Meanwhile, the formation water can be injected into the water injection layer under the action of the water injection unit 4. Thus, the functions of lifting the oil to the surface and injecting the formation water into the water injection layer are simultaneously realized in the casing 01.

It should be noted that the second end of the oil pipe 1 and the first end of the first submersible screw pump 21 may be connected by a screw thread, or may be connected by other methods, which is not specifically limited in the embodiment of the present application. In addition, the water outlet of the oil-water separator 3 can be connected with one end of the water injection unit 4 through threads, and can also be connected with one end of the water injection unit 4 through other modes. In addition, one end of the first flow guide pipe 22 close to the oil pipe 1 may be fixed to the first submersible screw pump 21 by a screw, or may be fixed by other methods.

The non-return element 5 may be a non-return valve, and of course, the non-return element 5 may also be another device capable of limiting the oil to flow only along the direction from the first submersible screw pump 21 to the oil pipe 1, and the non-return element 5 is not specifically limited in the embodiment of the present application.

In the embodiment of the present application, referring to fig. 2, the oil-water separator 3 may be a tapered cylindrical structure, the sectional area of the oil outlet is greater than the sectional area of the water outlet, and a first liquid inlet hole 31 is disposed at one end of the oil-water separator 3, which is close to the oil outlet. Like this, when the oil water mixture in the sleeve pipe 01 inner chamber gets into oil water separator 3's inner chamber through first feed liquor hole 31, can form the whirl, because the density of oil is less than the density of formation water, therefore makes oil suspension to the upper strata, and formation water deposits to the lower floor, and then has realized the separation of formation water and oil among the oil water mixture.

In some embodiments, with continued reference to FIG. 2, the centerline of the first inlet opening 31 is tangential to the outer surface of the oil water separator 3 and perpendicular to the centerline of the oil water separator 3. Like this, the oil water mixture enters into oil water separator 3 through first feed liquor hole 31 after, can form the whirl along oil water separator 3's inner wall, and then at the in-process of oil water mixture whirl, the mutual collision that takes place between the profit realizes the purpose of the separation of oil and stratum water.

In other embodiments, the center line of the first liquid inlet hole 31 is tangent to the outer surface of the oil-water separator 3, and the center line of the first liquid inlet hole 31 is inclined downward. Thus, after the oil-water mixture enters the oil-water separator 3 through the first liquid inlet hole 31, compared with the embodiment corresponding to fig. 2, the oil-water mixture can better form a rotational flow along the inner wall of the oil-water separator 3, and thus the purpose of separating oil and formation water in the oil-water mixture can be better achieved.

Because the central line of the first liquid inlet hole 31 is inclined downwards, when the oil-water mixture enters the inner cavity of the oil-water separator 3, the flowing direction of the oil-water mixture is inclined downwards, and compared with the mode that the oil-water mixture flows into the oil-water separator 3 in the horizontal direction, the oil-water mixture has a faster flow speed under the action of gravity, so that the function of separating the oil-water mixture can be better realized.

In the embodiment of the present application, referring to fig. 3, the first submersible screw pump 21 may include: a first screw pump 211, a first motor 212, and a first coupling 213. The first end of the first screw pump 211 is connected with the inlet end of the non-return element 5, the second end of the first screw pump 211 is connected with the motor shaft of the first motor 212 through the first coupling 213, the second end of the first screw pump 211 is further connected with one end of the first flow guide pipe 22, and the first coupling 213 and the first motor 212 are positioned in the first flow guide pipe 22. The first coupling 213 is provided with a second liquid inlet hole 2131, and the second liquid inlet hole 2131 is communicated with the central hole of the first coupling 213 and the first flow guide pipe 22.

In connection with the above embodiment, after the oil enters the first fluid guide pipe 22, since the first coupling 213 is provided with the second fluid inlet hole 2131, and the second fluid inlet hole 2131 communicates with the central hole of the first coupling 213 and the first fluid guide pipe 22, the oil enters the central hole of the first coupling 213 through the second fluid inlet hole 2131. Then, since the second end of the first screw pump 211 is connected to the motor shaft of the first motor 212 through the first coupling 213, the first motor 212 is started to drive the screw of the first screw pump 211 to start rotating, and further, when the screw of the first screw pump 211 starts rotating, crude oil in the central hole of the first coupling 213 is pumped. Finally, because the first end of the first screw pump 211 is connected with the second end of the oil pipe 1, and the first end of the oil pipe 1 is used for being fixed at the wellhead of the oil-gas well, after the first screw pump 211 pumps the crude oil, the crude oil can be lifted to the surface along the oil pipe 1, and the production of the crude oil is realized. The screw pump lifts the petroleum to the ground surface through the rotation of the screw, and the screw pump does not lift the petroleum to the ground surface through the rod pump, so that the screw pump is suitable for a narrower space and a large-inclination oil well, and is wider in application range.

It should be noted that the second end of the first screw pump 211 may be connected to one end of the first flow pipe 22 through a screw, or may be connected to one end of the first flow pipe 22 through another manner, which is not specifically limited in the embodiment of the present invention.

Further, in some embodiments, with continued reference to fig. 3, the first submersible screw pump 21 may further comprise: a first motor protector 214, the first motor protector 214 being connected in series between the first motor 212 and the first coupling 213. In this way, the first motor protector 214 may protect the first motor 212 from mechanical and electrical damage. Such as to avoid damage to the first motor 212 from moisture, overload, or over-current.

In the embodiment of the present application, with continuing reference to fig. 1, the water injection unit 4 may include: a second submersible screw pump 41 and a second flow conduit 42. The first end of the second draft tube 42 is communicated with the water outlet of the oil-water separator 3, one end of the second submersible screw pump 41 extends into the second draft tube 42 and is sealed in the second draft tube 42, and the second submersible screw pump 41 is used for pumping the formation water separated by the oil-water separator 3 along the second draft tube 42 and injecting the formation water into the water injection layer.

After the oil-water separator 3 separates out the formation water, because the first end of the second draft tube 42 is communicated with the water outlet of the oil-water separator 3, and one end of the second submersible screw pump 41 extends into the second draft tube 42 and is sealed in the second draft tube 42, the formation water can enter into the second draft tube 42. Since the second submersible screw pump 41 is used to pump the formation water separated by the oil-water separator 3 along the second flow guide pipe 42 and to inject the formation water into the water injection layer, the second submersible screw pump 41 can inject the formation water entering the second flow guide pipe 42 into the water injection layer. Thus, the function of injecting the formation water into the water layer is completed.

In some embodiments, referring to fig. 4, the second submersible screw pump 41 may comprise: a second screw pump 411, a second coupling 412, and a second motor 413. A first end of the second screw pump 411 is connected with a motor shaft of the second motor 413 through a second coupling 412, a first end of the second screw pump 411 is further connected with a second end of the second delivery pipe 42, and the second coupling 412 and the second motor 413 are located in the second delivery pipe 42. The second coupling 412 is provided with a third liquid inlet 4121, and the third liquid inlet 4121 is communicated with the central through hole of the second coupling 412 and the second flow guide pipe 42.

Obviously, after the formation water enters the second guide pipe 42, since the second coupling 412 and the second motor 413 are located in the second guide pipe 42, the second coupling 412 is provided with a third liquid inlet 4121, and the third liquid inlet 4121 communicates the central through hole of the second coupling 412 with the second guide pipe 42, so the formation water enters the central hole of the second coupling 412 through the third liquid inlet 4121. Then, since the first end of the second screw pump 411 is connected to the motor shaft of the second motor 413 through the second coupling 412, the formation water continues to enter the second screw pump 411, and when the second motor 413 starts to rotate, the screw of the second screw pump 411 starts to rotate, so that the formation water is injected into the water injection layer. Wherein, because the screw pump passes through the rotation of screw rod and pours into the water injection layer with the stratum water into, not through the rod-type pump with the water injection layer of stratum water injection, therefore be fit for narrower and small space, also be fit for using in the oil well of big inclination, the range of application is wider.

It should be noted that the first end of the second screw pump 411 may be connected to the second end of the second delivery pipe 42 through a screw, or may be connected to the second end of the second delivery pipe 42 through another way, which is not specifically limited in the embodiment of the present application.

Further, in some embodiments, with continued reference to fig. 4, the second submersible screw pump 41 may further comprise: a second motor protector 414, the second motor protector 414 being connected in series between the second motor 413 and the second coupling 412. In this way, the second motor protector 414 may protect the second motor 413 from mechanical and electrical damage. For example, the second motor 413 may be protected from being damaged by moisture, overload, or overcurrent.

In some embodiments, referring to fig. 5, the process column may further comprise: a packer 6. The packer 6 is sleeved at the second end of the second screw pump 411 and used for packing the inner cavity of the casing 01, the upper layer space obtained by packing can be communicated with a reservoir in an oil-gas well, and the lower layer space obtained by packing can be communicated with a water injection layer in the oil-gas well. Thus, since the upper space and the lower space are separated by the packer 6, the formation water separated by the oil-water separator 3 is directly injected into the water injection layer through the lower space without affecting the upper space. The formation water separated by the oil-water separator 3 is prevented from entering the oil-water separator 3 again through the upper space, and the working efficiency of the oil-water separator 3 is further reduced.

In other embodiments, referring to fig. 6, the process column may further comprise: a cannula 7 and a packer 6. One end of the insertion pipe 7 is communicated with the second end of the water injection screw pump, the packer 6 is sleeved at the second end of the insertion pipe 7 and used for packing the inner cavity of the sleeve 01, the upper-layer space obtained by packing can be communicated with a reservoir stratum in an oil-gas well, and the lower-layer space obtained by packing can be communicated with a water injection layer in the oil-gas well. That is, the packer 6 separates the inner cavity of the casing 01 into an upper space communicating with the reservoir in the oil and gas well and a lower space communicating with the water injection layer in the oil and gas well by being sleeved on the second end of the insertion pipe 7. In this way, the situation that the packer 6 is directly sleeved on the second end of the second screw pump 411 can be avoided, so that the packer 6 does not damage the second screw pump 411.

This application separates the oil-water mixture in the sleeve through oil water separator 3 to obtain oil and formation water, on the one hand, the one end of keeping away from oil pipe on the first honeycomb duct 22 communicates with oil-out of oil water separator 3, the second end of the first screw pump 21 of diving stretches into first honeycomb duct 22, and sealed in first honeycomb duct 22, consequently, the oil of separating can get into in the first honeycomb duct 22 under the suction of the first screw pump 21 of diving to with this through check member 5's entry end, check member 5's exit end after, lift to the earth's surface along oil pipe 1. That is, the process string has a function of separating oil and water from crude oil containing water in an oil well, lifting the separated oil to the surface, and preventing the oil lifted to the surface from falling back to the first submersible screw pump 21. On the other hand, because the water outlet of the oil-water separator 3 is connected with one end of the water injection unit 4, the water injection unit 4 is used for injecting the formation water obtained by the separation of the oil-water separator 3 into the water injection layer. That is, the process column has the function of injecting the separated formation water into the water injection layer. In addition, because the oil pipe 1, the first submersible screw pump 21, the first flow guide pipe 22, the oil-water separator 3 and the water injection unit 4 are all positioned in the inner cavity of the casing, that is, the function of lifting oil to the ground surface and the function of injecting formation water into the water injection layer are both realized in the inner cavity of the casing, in other words, the functions of lifting oil to the ground surface and injecting formation water into the water injection layer are simultaneously realized in an oil well, therefore, the phenomenon that an oil-water mixture is lifted to the ground surface and the separated formation water is injected into the formation after oil-water separation is carried out on the ground surface is avoided through the process pipe column provided by the application, and further, the high labor intensity of personnel brought in the process of injecting water into the formation from the ground surface is avoided. In addition, the process string provided by the present application can prevent the oil lifted to the surface from falling back to the first submersible screw pump 21 by the check member 5, thereby improving the ability to lift the oil to the surface.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.