CN214303794U

CN214303794U - Oil extraction device

Info

Publication number: CN214303794U
Application number: CN202022510124.8U
Authority: CN
Inventors: 孙伟; 杨兴国; 付阳秋; 魏靖依; 张帆
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-09-28
Anticipated expiration: 2030-11-03

Abstract

The application discloses oil recovery device relates to oil field layering oil recovery field. The oil extraction device 10 comprises a sucker rod 11, an oil pumping pipe 12, a separate extraction device 13, a bridge plug 14 and a sealing element 15; the sucker rod 11 is arranged in the pipe cavity of the oil pumping pipe 12, and the bottom of the sucker rod 11 is fixedly connected with the separate mining device 13; the bridge plug 14 is fixedly sleeved on the outer wall of the oil extraction device 10, the oil separator 13 is detachably arranged in the pipe cavity of the oil pumping pipe 12 at the top of the bridge plug 14, and the sealing element 15 is detachably and hermetically connected with the bottom of the bridge plug 14. This application is through the sealing connection of sealing member and bridging plug for the oil recovery device can realize the regulation to the production flowing pressure of different oil reservoirs, improves the oil recovery efficiency of multilayer oil recovery.

Description

Oil extraction device

Technical Field

The application relates to the field of oil field layered oil extraction, in particular to an oil extraction device.

Background

In the process of oil field development, because oil field development layers have multiple layers, large interlayer spacing, strong heterogeneity and large pressure system difference, the problem of interlayer interference is particularly prominent, and the recovery ratio of the oil field is seriously influenced, therefore, the interlayer interference can be reduced, the ineffective water circulation can be controlled by adopting the related process technology of the layered oil recovery, and the effective development of the same well of the multiple layers can be realized.

In the related technology, in the process of layered oil production, a packer setting mode is usually used on a layered string to seal different oil layers and then layered oil production is carried out.

However, the whole pipe column is in a bending and compressing state for a long time due to the setting mode of the packer, so that serious friction is generated between the pipe column and the well wall of the oil production well, the problems of eccentric wear, rod falling, pipe leakage and the like of the oil production device are further caused, the oil production efficiency is seriously influenced, the maintenance-free period of the layered oil production process technology is short, and the service life of the oil production device is short.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an oil recovery device, can be used to in the oil recovery technology of layering, improves the oil recovery efficiency of multilayer oil recovery.

The technical scheme at least comprises the following scheme:

according to one aspect of the present application, there is provided an oil recovery device comprising a sucker rod, an oil extraction pipe, a production separator, a bridge plug and a seal;

the sucker rod is arranged in the pipe cavity of the oil pumping pipe, and the bottom of the sucker rod is fixedly connected with the separate mining device;

the bridge plug is fixedly sleeved on the outer wall of the oil extraction device, the separate oil extraction device is detachably arranged in a pipe cavity of the oil extraction pipe at the top of the bridge plug, and the sealing element is detachably and hermetically connected with the bottom of the bridge plug.

In one implementation of the present application, the seal is a sealing cannula, the sealing cannula including a tube body and a seal; the top of body and the bottom detachably sealing connection of bridging plug, the sealant sets up in the inside of body.

In one implementation of the present application, the oil recovery device further comprises a guiding device; the guiding device is sleeved on the outer wall of the oil pumping pipe, and the bottom of the guiding device is fixedly arranged at the top of the bridge plug.

In one realisable form of the present application, the guiding means is in the form of an inverted umbrella, the bottom opening of which is used to guide the production means downwards in the conduit.

Under this application realizable mode, divide and adopt the ware including the oil recovery pump with be no less than two oil recovery passageways, the liquid of different oil reservoir of different oil recovery passageway confession passes through.

In an implementation manner of the present application, the oil recovery device further includes a guide shoe, and the guide shoe is fixedly disposed at a bottom of the sealing member.

In one manner of realisation of the present application, the guide shoe is a cone.

Under this application realizable mode, oil recovery device still includes crosses liquid sand control device, crosses the fixed bottom that sets up in the sealing member of liquid sand control device.

Under this application realizable mode, the bottom of crossing liquid sand control device evenly is provided with a plurality of through-holes, and the through-hole is used for the liquid in the pipeline to pass through.

Under this application realizable mode, oil recovery device still includes the guide shoe, and the guide shoe is fixed to be set up in the bottom of crossing liquid sand control device.

In an implementation mode of the present application, the oil recovery device further comprises a centralizer, a top of the centralizer is detachably connected with the oil pumping pipe, and the centralizer penetrates through the bridge plug.

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

the oil extraction device is used for forming a sealing area by setting above the oil extraction layer to be extracted by detachably and hermetically connecting the bridge plug and the sealing element so as to extract oil from the oil extraction layer. The sealed connection of bridging plug and sealing member can realize the regulation to the production flowing pressure of different oil reservoirs for the production flowing pressure of every oil reservoir can all reach the standard of producing oil, avoids the unable oil recovery of realizing of a certain oil reservoir or the lower condition of oil output to appear, thereby improves the oil recovery efficiency of multilayer oil recovery.

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 block diagram of an oil recovery device provided in an exemplary embodiment of the present application;

FIG. 2 is a schematic diagram of the structure of an oil recovery device provided in an exemplary embodiment of the present application;

fig. 3 is a flowchart of a method of operating an oil recovery device according to an exemplary embodiment of the present application.

The various reference numbers in the drawings are illustrated below:

10-an oil recovery unit;

01-a pipeline;

11-a sucker rod;

12-an oil extraction pipe;

13-a separate mining device;

14-a bridge plug;

15-a seal;

16-a guide;

17-a guide shoe;

18-a liquid-passing sand control device;

19-a centralizer.

The specific implementation mode is as follows:

unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art.

In the embodiments of the present application, reference to "front" and "rear" is made to front and rear as shown in the drawings.

"first end" and "second end" are opposite ends.

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.

The embodiment of the application provides an oil recovery device, can be used to in the oil recovery technology of layering, improves the oil recovery efficiency of multilayer oil recovery. As shown schematically in FIG. 1, the oil recovery device 10 provided by the embodiment of the present application includes a sucker rod 11, a sucker rod 12, a production distributor 13, a bridge plug 14 and a sealing member 15.

Illustratively, the sucker rod 11 is arranged in the lumen of the oil pumping pipe 12, and the bottom of the sucker rod 11 is fixedly connected with the sub-extractor 13. Illustratively, the bridge plug 14 is fixedly sleeved on the outer wall of the oil extraction device 10, the sub-extractor 13 is detachably arranged in the pipe cavity of the oil pumping pipe 12 at the top of the bridge plug 14, and the sealing element 15 is detachably and hermetically connected with the bottom of the bridge plug 14.

In the oil extraction device 10, a sucker rod 11 and an oil pumping pipe 12 are used in cooperation for lifting liquid extracted from an oil layer, and a sub-extractor 13 is used as one of main components for oil extraction to provide lifting power for oil extraction operation. Illustratively, the branch adopts ware 13 to include the oil recovery pump and be no less than two oil recovery passageways, and different oil recovery passageways supply the liquid of different oil reservoirs to pass through, and the oil recovery passageway of being no less than two can realize producing oil to a plurality of oil reservoirs simultaneously. Illustratively, the production manifold 13 is removably disposed within the lumen of the oil extraction tubing 12. The detachable installation mode is convenient for replacing the separate mining device 13 with other process devices to realize other process technologies, such as a water plugging process.

As schematically shown in fig. 1, the sub-extractor 13 comprises a production pump and at least two production channels (the production pump and the production channels are not shown). The oil extraction pump provides oil extraction power, one oil extraction channel is used for liquid of an upper oil layer to pass through, the other oil extraction channel is used for liquid of a lower oil layer to pass through, and the two oil extraction channels are not interfered with each other and can operate simultaneously or not simultaneously.

The bridge plug 14 is a packer that can stay at a certain depth in the well and can be detached from the pipe string, and is a working tool for plugging a bottom layer, a well, a separate production truck water plugging layer, and the like. The packer is a special downhole tool for sealing and separating oil, gas and water layers in a downhole casing or an open hole. The packer principle is that the length of the packer is shortened and the diameter of the packer is increased under the action of external force, an oil layer is sealed, and an upper oil layer, a lower oil layer and a water layer of the packer are separated, so that the purpose of layered oil extraction is achieved.

As shown schematically in fig. 1, the bridge plug 14 is a drillable bridge plug, and the bridge plug 14 is fixedly sleeved on the outer wall of the oil production device 10. When a lower oil layer needs to be plugged, the bridge plug 14 is set above the lower oil layer. The drillable bridge plug is a bidirectional slip support, is a plugging tool for realizing hydraulic setting and drill-grinding deblocking, and has the following working principle: connecting the drillable bridge plug at the lower end of a hydraulic setting tool, connecting the hydraulic setting tool to a pipe column and lowering the hydraulic setting tool to a preset position to be set in a well, pumping hydraulic pressure into the pipe column through a pump truck, and realizing setting of the drillable bridge plug when the pressure is suddenly zero.

The drillable bridge plug can effectively avoid the risk of well jamming of the conventional packer, can solve the problem by locally maintaining the drillable bridge plug when the setting of an oil layer is invalid, reduces the maintenance difficulty, and indirectly improves the efficiency of multilayer oil extraction. Meanwhile, the conventional packer setting mode enables the whole oil extraction device 10 to be in a state of upper part extension and lower part compression bending, so that the sucker rod, the oil pumping pipe and the like can be abraded, and the repair-free period of the layered oil extraction process technology is influenced. The drillable bridge plug can effectively avoid the problems, reduce the influence of the creeping of the pipe column on the bridge plug, prolong the service life of the bridge plug, ensure that the oil extraction device 10 is always in an extended state and avoid the abrasion of the oil extraction device 10.

In the oil extraction operation, the oil extraction channel is arranged above the packer, and after the packer is sealed, the opening and closing of the oil extraction channel can be controlled through the difference of the pressures of the upper layer and the lower layer of the packer, so that the operation without killing a well and blowing out is realized. Illustratively, the sub-extractor 13 is detachably disposed above the bridge plug 14, and is configured to lift the liquids extracted from the upper oil layer and the lower oil layer to the ground through different oil extraction channels thereof, respectively, through the oil extraction pipe 12, so as to achieve multi-layer oil extraction.

The sealing element 15 is used in cooperation with the bridge plug 14 to achieve the purpose of sealing the oil layer. The sealing member 15 is made of a sealing material having corrosion resistance, high temperature resistance, and high tensile strength, such as a rubber tube made of a rubber material. Illustratively, the seal 15 may be made of a resilient sealing material to avoid abrasion against the inner wall of the oil extraction pipe 12 or the bottom of the bridge packing 14.

There are many alternative ways of constructing the seal 15, such as a cylindrical cup or the like. The embodiment of the application provides an achievable mode as follows: the sealing member 15 is a sealing cannula including a tube body and a sealing object; the top of the pipe body is detachably connected with the bottom of the bridge plug 14 in a sealing mode, and the sealing object is arranged inside the pipe body. Illustratively, the sealant is a sealing rubber ring which is arranged on the sealing insertion pipe, so that the bridge plug 14 can be recycled during pump inspection operation.

As schematically shown in fig. 1, the seal 15 is a sealed cannula. The top of the sealed intubation tube is detachably and hermetically connected with the bridge plug 14, so that the position of the sealed intubation tube can be conveniently adjusted, and effective sealing of an oil layer to be set is realized. The use of the bridge plug 14 and the sealing member 15 in cooperation divides the oil extraction device 10 into two sections, the upper layer is a lifting channel with the same flowing pressure, and the lower layer is a lifting channel with the other flowing pressure. Wherein, the upper layer flow pressure is suitable for the upper oil layer, the lower layer flow pressure is suitable for the lower oil layer, and the liquid of the two layers is mixed in the oil pipe and lifted to the ground after being lifted by different oil extraction channels of the separate oil extractor 13.

As shown schematically in fig. 1, taking an example that the bridge plug 14 is a drillable bridge plug and the sealing element 15 is a sealing insertion tube, the operation principle of the oil production device provided by the embodiment of the present application for layered oil production is as follows:

the drillable bridge plug is connected to the lower end of the hydraulic setting tool on the ground, the hydraulic setting tool is connected to the pipe column and is lowered to a preset position to be set in the pipeline 01, namely the upper side of a lower oil layer, and the drillable bridge plug is set by a tool releasing tool after being pressed into the pipe column by a pump truck.

The sealed cannula is lowered into the pipeline 01 to be sealed with the drillable bridge plug, and the scour prevention distance is adjusted at the same time. The anti-impact distance is the distance that the piston on the sucker rod 11 is lifted to prevent the fixed valve or the one-way valve from being impacted in the descending process of the oil extraction device 10, and the value of the anti-impact distance is approximately equal to the sum of elastic expansion deformation (namely, the stroke loss) of the sucker rod 11 and the oil pumping pipe 12 under the action of liquid column load and is increased by 5-10 cm.

An oil pumping pipe 12 is used for sequentially connecting an oil pumping rod 11 and a separate oil extraction device 13 and is arranged at a specified position in the pipeline 01, and the separate oil extraction is started after the anti-impact distance is adjusted. When the oil recovery device 10 goes down, the liquid of the upper and lower oil layers flows through different fixed valve passages in the sub-separator 13, and is sucked into the respective pump chambers. When the oil extraction device 10 moves upwards, the liquid in the two pump cavities flows through different traveling valves and plunger inner hole channels in the separate oil extraction device 13, and the liquid is pressed into an oil pipe to be mixed and then is discharged to the ground.

To sum up, the oil recovery device that this application embodiment provided uses through the cooperation of bridging plug 14 and sealing member 15, can improve the sealed effect to the oil reservoir, through the regulation to the production flowing pressure of different oil reservoirs for the production flowing pressure of every oil reservoir all can reach the standard of producing oil, avoids the unable oil recovery of realizing of a certain oil reservoir or the lower condition of oil production volume to appear. The oil recovery device that this application embodiment provided can prevent to produce the interference between the layer for original multilayer oil reservoir can produce oil simultaneously, and then improves the oil production of oil well, solves the plane contradiction and the layer contradiction of oil reservoir.

In the actual use process of oil recovery device 10, because the underground depth of different oil reservoirs is different, the downhole depth that leads to oil recovery device 10 is different, and when lower oil reservoir was in darker stratum, oil recovery device 10 also can be longer in the journey distance in the pit, causes the collision of oil recovery device 10 and pipeline 01 easily this moment. As schematically shown in fig. 2, to solve the above problem, the embodiment of the present application provides an oil recovery device 10, which can effectively avoid collision between the oil recovery device 10 and the pipeline 01.

Illustratively, the oil recovery device 10 further comprises a guiding device 16, and the guiding device 16 plays a role of guiding and protecting during the downhole process of the oil recovery device 10, on one hand guiding the oil recovery device 10 downwards and on the other hand protecting the oil recovery device 10 from colliding with the pipeline 01.

Illustratively, the guiding device 16 is sleeved on the outer wall of the oil extraction pipe 12, and the bottom of the guiding device 16 is fixedly arranged at the top of the bridge plug 14. In the process of oil production by the multilayer oil production process, the bridge plug 14 is used for setting, and then the oil production device 10 is lowered into the pipeline 01. At this time, the guide 16 fixedly installed on the top of the bridge plug 14 can guide the downward movement of the oil recovery device 10 so that it can precisely pass through the hollow area of the bridge plug 14. Illustratively, the guide 16 is made of an elastic material to avoid wear of the production unit 10. Illustratively, the shape, size and structure of the guiding device 16 can be adjusted according to actual needs, without limitation, on the premise that the oil recovery device 10 can be accommodated to descend.

Illustratively, the guide 16 is a tubular structure with through holes at both ends, and the diameter of the through holes at both ends of the guide 16 may be uniform or different. As schematically shown in fig. 2, the guiding device 16 is in the form of an inverted umbrella structure with its bottom opening for guiding the production unit 10 downward in the pipeline 01. The diameter of the upper end through hole of the inverted umbrella-shaped structure is larger than that of the lower end through hole, and the diameter of the lower end through hole is not larger than that of the hollow area of the bridge plug 14, so that the oil extraction device 10 can smoothly pass through the bridge plug 14 to move downwards.

As an example, the guiding device 16 may be composed of a plurality of layers of petal-shaped structures in sequence, and during the process of descending the oil production device 10 through the bridge plug 14, the descending direction of the oil production device 10 is continuously adjusted through the gradual contraction of the plurality of layers of petal-shaped structures, and finally the guiding device is guided to enter the lower layer oil layer through the bridge plug 14.

In addition, to improve the efficiency of descending the oil recovery device 10, as schematically shown in fig. 2, the oil recovery device 10 provided in the embodiment of the present application further includes a guide shoe 17. The guide shoe 17 is a guide tool for preventing the bottom of the oil recovery device 10 from scratching or being inserted into the wall of the well, and facilitates the guiding of the oil recovery device 10 smoothly through the well and finally down to the bottom of the pipeline 01.

Illustratively, the guide shoe 17 is fixedly disposed at the bottom of the seal member 15. The guide shoe 17 can be mainly divided into three types according to the difference of manufacturing materials, namely a wooden guide shoe, a pig iron guide shoe and a cement guide shoe, the three types of guide shoes can all achieve the effect of guiding the oil extraction device 10 to move downwards, and the oil extraction device 10 provided by the embodiment of the application can be guided by the cement guide shoe.

Illustratively, to better guide the downward movement of the oil extraction device 10, the guide shoe 17 may be a cone, the tip of which is a smooth tip, and the bottom of which is fixedly connected to the bottom of the sealing member 15. Illustratively, the bottom of the cone and the bottom of the sealing member 15 are both circular, the diameter of the bottom of the cone is smaller than that of the bottom of the sealing member 15, and the bottom of the cone is fixedly arranged at the center of the bottom of the sealing member 15. The shape, size and relative position of the bottom of the cone and the bottom of the sealing member 15 can be adjusted according to actual needs, and the application is not limited herein.

The use of the guide device 16 and the guide shoe 17, or the cooperation of the guide device 16 and the guide shoe 17, can effectively avoid the collision of the oil extraction device 10 with the pipeline 01 during the descending process, especially the cooperation of the guide device 16 and the guide shoe 17. The oil extraction device 10 provided by the utility model can reduce the abrasion of the oil extraction device 10, further prolong the service life of the oil extraction device 10, improve the well descending efficiency of the oil extraction device 10, and save the preparation time in the early stage for the oil extraction operation.

In the oil extraction operation, because the reservoir stratum of the oil reservoir is mostly loose cemented sandstone, and certain damage is caused to the framework of the reservoir stratum in the production process, or long-term water injection exploitation or gas injection exploitation is carried out, the problem of sand production exists in the oil reservoir. Gravel all can cause the erosive wear to equipment, valves, pipelines and the like along with highly flowing gas or liquid, causes great potential safety hazard, easily causes the problem of oil well production reduction or production stop, also can influence the aggravation wearing and tearing of ground and downhole equipment, the situation that the stratum collapses appears easily, consequently needs to solve the sand production problem in the oil and gas field development process.

As schematically shown in fig. 2, the oil recovery device 10 provided in the embodiment of the present application further includes a liquid-passing sand control device 18, where the liquid-passing sand control device 18 is fixedly disposed at the bottom of the sealing member 15. The setting of crossing liquid sand control device 18 can effectively reduce the inside that the gravel got into oil recovery device 10 under the prerequisite that the liquid in the assurance pipeline 01 passed through, avoids the wearing and tearing that cause oil recovery device 10.

As schematically shown in fig. 2, the fluid sand control device 18 includes a device body having a hollow cylindrical shape and an outer wall having a certain thickness, and a joint for filtering gravel. The fluid-passing sand control device 18 may include a device body and a joint that are fixedly connected or integrally formed. Illustratively, the bottom of the liquid-permeable sand control device 18 is provided with a component for preventing gravel from passing through, such as a screen, a mesh or filtering holes, and the mesh or filtering holes can be set according to actual needs.

Illustratively, the bottom of crossing liquid sand control device 18 evenly is provided with a plurality of through-holes, the through-hole is used for the liquid in the pipeline 01 to pass through, prevents that the gravel from getting into to the liquid that makes to adopt smoothly gets into the pump chamber of branch ware 13. Illustratively, the diameter of the through-hole may be set according to the sand conditions of the oil reservoir from which the oil is produced, and the present application is not limited thereto.

As schematically shown in fig. 2, the oil recovery device 10 may also be provided with a guide shoe 17 and a fluid-through sand control device 18. That is, the oil recovery device 10 that this application embodiment provided still includes guide shoe 17 and crosses liquid sand control device 18, and the guide shoe is fixed to be set up in the bottom of crossing liquid sand control device 18, crosses liquid sand control device 18 and fixes to be set up in the bottom of sealing member 15.

Through the setting of the liquid-passing sand control device 18, the erosion abrasion of gravel entering the pipe cavity of the oil extraction device 10 or equipment, valves, pipelines and the like caused by gas or liquid flowing along with the height can be effectively reduced, so that the abrasion of ground and underground equipment is reduced, the potential safety hazard is avoided, the purity of oil mass is improved, and the production reduction or the production stop of an oil well is avoided.

In the process of oil and gas drilling, because the pipeline 01 is not a completely vertical channel, the oil extraction device 10 needs to be inclined to a certain degree to move downwards in the descending process, and especially in a highly-deviated well, the oil extraction device 10 needs to be inclined for multiple times at different angles.

As schematically shown in fig. 2, the oil recovery device 10 provided by the embodiment of the present application further includes a centralizer 19. Illustratively, the top of centralizer 19 is removably attached to sucker rod 12, and centralizer 19 extends through bridge plug 14.

The centralizer 19 is a centralizing frame provided to ensure that the casing string being run in is centered in the wellbore, and mainly serves to prevent the tubing string from tilting, and to prevent eccentric wear of the production unit 10 and tubing 01, especially eccentric wear of the sucker rod 11 and sucker rod 12. Centralizer 19 may be made of a resilient material and may be spring-loaded, or may be a lantern-like, or other shaped frame, and is not limited in this application.

Illustratively, the removable connection of centralizer 19 to sucker rod 12 allows for the addition of one or more centralizers 19 to production unit 10 as needed. For example, in a highly deviated well, after the bridge plug 14 is seated, the oil recovery device 10 needs to be adjusted by installing a plurality of centralizers 19 because of the large inclination angle of the well, so that the oil recovery device 10 can be accurately lowered to a specified position of the pipeline 01 to perform oil recovery operation. Illustratively, the number of the centralizers 19 can be adjusted according to actual needs, and the application is not limited herein.

As shown in fig. 3 schematically, taking the oil recovery device 10 shown in fig. 2 as an example, the operation steps of the oil recovery device 10 provided by the embodiment of the present application for performing stratified oil recovery are specifically as follows:

step 302: connecting the guide 16 and the bridge packing 14.

Step 304: the guide 16 and the bridge plug 14 are set using a hydraulic setting tool into a predetermined position to be set.

The guide 16 is connected to the bridge plug 14 at the surface while the bridge plug 14 is connected to the lower end of the hydraulic setting tool with the guide 16 in an unopened state.

The hydraulic setting tool is connected to the pipe column and is lowered to a preset position to be set in the pipeline 01, namely the position above a lower oil layer, the hydraulic setting tool is pressed into the pipe column through the pump truck until the hydraulic setting tool is released, and setting of the bridge plug 14 on the lower oil layer is achieved. After the bridge packings 14 are set, the guides 16 are opened to provide a path for movement of the production unit 10 downstream. Taking the example where the guide is an inverted umbrella structure, the inverted umbrella structure is contracted prior to lowering the well and, after the bridge packings 14 are seated, the inverted umbrella structure opens to form the descent passage.

Step 306: the pumping pipe 12 is used for connecting a pumping rod 11, a separate production device 13, a centralizer 19, a sealing element 15, a liquid-passing sand control device 18 and a guide shoe 17 in sequence and is lowered into a specified position in the pipeline 01.

Step 308: and adjusting the anti-impact distance and starting oil extraction operation.

Use oil extraction pipe 12 to connect gradually sucker rod 11, branch adopt 13, centralizer 19, sealing member 15, cross liquid sand control device 18 and guide shoe 17 to with its assigned position of going into in the pipeline 01, seal sealing member 15 and bridging plug 14, then adjust the scour protection apart from, begin the layering oil recovery operation after the scour protection apart from adjusting.

The anti-impact distance is the distance that the piston on the sucker rod 11 is lifted to prevent the fixed valve or the one-way valve from being impacted in the descending process of the oil extraction device 10, and the value of the anti-impact distance is approximately equal to the sum of elastic expansion deformation (namely, the stroke loss) of the sucker rod 11 and the oil pumping pipe 12 under the action of liquid column load and is increased by 5-10 cm.

When the oil recovery device 10 goes down, the liquid of the upper and lower oil layers flows through different fixed valve passages in the sub-separator 13, and is sucked into the respective pump chambers. When the oil extraction device 10 moves upwards, the liquid in the two pump cavities flows through different traveling valves and plunger inner hole channels in the separate oil extraction device 13, and the liquid is pressed into an oil pipe to be mixed and then is discharged to the ground.

To sum up, the oil recovery device 10 that this application embodiment provided, through guider 16 and the use of guide shoe 17, perhaps uses through guider 16 and the cooperation of guide shoe 17, effectively avoids oil recovery device 10 at the collision of going down in-process and pipeline 01, and then improves oil recovery device 10's life, has also improved oil recovery device 10's efficiency of going into the well simultaneously, has saved the preparation time of earlier stage for the oil recovery operation.

In addition, the oil recovery device 10 that this application embodiment provided sets up through liquid sand control device 18 in the bottom of sealing member 15, effectively reduces the grit and gets into the intracavity of oil recovery device 10 to reduce the wearing and tearing of ground and downhole equipment, avoided the appearance of potential safety hazard. Meanwhile, the oil extraction device 10 provided by the embodiment of the application centralizes the downward movement of the oil extraction device 01 through the centralizer 19, so that the eccentric abrasion generated between the oil extraction device 10 and the pipeline 01 is avoided.

In the present application, it is to be understood that the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.

All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.

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.

Claims

1. An oil extraction device (10), characterized in that the oil extraction device (10) comprises an oil pumping rod (11), an oil pumping pipe (12), a separate oil extractor (13), a bridge plug (14) and a sealing element (15);

the sucker rod (11) is arranged in a pipe cavity of the oil pumping pipe (12), and the bottom of the sucker rod (11) is fixedly connected with the separate mining device (13);

the bridge plug (14) is fixedly sleeved on the outer wall of the oil extraction device (10), the oil extraction separator (13) is detachably arranged in the pipe cavity of the oil extraction pipe (12) at the top of the bridge plug (14), and the sealing element (15) is detachably and hermetically connected with the bottom of the bridge plug (14).

2. The oil recovery device (10) according to claim 1, characterized in that the seal (15) is a sealing cannula comprising a tube and a seal;

the top of the pipe body is detachably connected with the bottom of the bridge plug (14) in a sealing mode, and the sealing object is arranged inside the pipe body.

3. The oil recovery device (10) according to claim 1, characterized in that the oil recovery device (10) further comprises a guiding device (16);

the guiding device (16) is sleeved on the outer wall of the oil pumping pipe (12), and the bottom of the guiding device (16) is fixedly arranged at the top of the bridge plug (14).

4. The oil recovery device (10) according to claim 3, characterized in that the guiding device (16) is an inverted umbrella structure, the bottom opening of which is used to guide the oil recovery device (10) to move downwards in the pipeline (01).

5. A production unit (10) according to any of claims 1 to 4, characterized in that the sub-producer (13) comprises a production pump and not less than two production channels, different production channels being provided for the passage of liquids of different oil layers.

6. The oil recovery device (10) according to any of claims 1 to 4, characterized in that the oil recovery device (10) further comprises a guide shoe (17), the guide shoe (17) being fixedly arranged at the bottom of the seal (15).

7. The oil recovery device (10) according to claim 6, characterized in that the guide shoe (17) is a cone.

8. The oil recovery device (10) according to any of claims 1 to 4, characterized in that the oil recovery device (10) further comprises a liquid-passing sand control device (18), the liquid-passing sand control device (18) being fixedly arranged at the bottom of the sealing element (15).

9. The oil recovery device (10) according to claim 8, characterized in that the bottom of the liquid-passing sand control device (18) is uniformly provided with a plurality of through holes for the liquid in the pipeline (01) to pass through.

10. The oil recovery device (10) according to claim 8, characterized in that the oil recovery device (10) further comprises a guide shoe (17), the guide shoe (17) being fixedly arranged at the bottom of the liquid-permeable sand control device (18).

11. The production unit (10) according to any of claims 1 to 4, wherein the production unit (10) further comprises a centralizer (19), the top of the centralizer (19) being detachably connected to the oil extraction pipe (12), the centralizer (19) extending through the bridge packings (14).