CN217481252U - Connector for oil extraction pump and oil extraction device - Google Patents

Abstract

The application discloses connector and oil recovery device for oil recovery pump belongs to oil and equips technical field. The connector comprises an inner pipe, an outer pipe and a connecting piece, wherein the inner pipe is arranged in the outer pipe, an oil conveying space is formed between the inner pipe and the outer pipe, at least part of the connecting piece is arranged in the inner pipe, a first sealing ring is arranged between the connecting piece and the inner pipe, the inner pipe is movably sleeved on the connecting piece through the first sealing ring, the inner ring of the first sealing ring is in sealing contact with the outer wall of the connecting piece, the outer ring of the first sealing ring is in sealing contact with the inner wall of the inner pipe, and the connecting piece is connected with the outer pipe so that the inner pipe can be movably connected with the outer pipe through the connecting piece. According to the scheme, the problem that in the related technology, the inner oil pipe and the outer oil pipe of the oil extraction device are both in threaded connection with the oil extraction pump, so that the maintenance steps of the inner oil pipe are complex is solved.

Description

Connector for oil extraction pump and oil extraction device

Technical Field

This application belongs to oil and equips technical field, concretely relates to connector and oil recovery device for oil recovery pump.

Background

The oil extraction pump is important equipment for completing oil extraction operation, the oil extraction pump is connected with an oil pipe, the lower pump operation of the oil extraction pump is completed by means of the oil pipe, the oil pipe comprises an inner oil pipe and an outer oil pipe, the inner oil pipe is arranged in the outer oil pipe, an annular cavity is formed between the inner oil pipe and the outer oil pipe, oil flows in the annular cavity in the oil extraction process, and the inner oil pipe and the outer oil pipe are both in threaded connection with the oil extraction pump.

In the correlation technique, interior oil pipe's wall thickness is less than outer oil pipe for interior oil pipe is corroded by corrosive gas or liquid in the oil well easily, or by impurity such as the grains of sand that mix with in the fluid wearing and tearing, lead to interior oil pipe damaged, when needing to overhaul after oil pipe damaged including, interior oil pipe, outer oil pipe and oil extraction pump are taken out together, need dismantle interior oil pipe, outer oil pipe and oil extraction pump before the maintenance, overhaul the completion after, still need install interior oil pipe again, outer oil pipe and oil extraction pump, lead to interior oil pipe's maintenance step comparatively complicated.

SUMMERY OF THE UTILITY MODEL

The purpose of the embodiment of the application is to provide a connector and oil recovery device for oil recovery pump, can solve in the correlation technique, oil recovery device's interior oil pipe and outer oil pipe all with oil recovery pump threaded connection, lead to the comparatively complicated problem of maintenance step of interior oil pipe.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, the application discloses connector for oil recovery pump, including inner tube, outer tube and connecting piece, wherein:

the inner pipe is arranged in the outer pipe, and an oil conveying space is formed between the inner pipe and the outer pipe;

at least part of the connecting piece is arranged in the inner pipe, a first sealing ring is arranged between the connecting piece and the inner pipe, the inner pipe is movably sleeved on the connecting piece through the first sealing ring, an inner ring of the first sealing ring is in sealing contact with the outer wall of the connecting piece, and an outer ring of the first sealing ring is in sealing contact with the inner wall of the inner pipe;

the connecting piece is connected with the outer pipe, so that the inner pipe is movably connected with the outer pipe through the connecting piece.

In a second aspect, the present application further provides an oil production device, including oil pipe, oil extraction pump and foretell connector, oil pipe includes interior oil pipe and outer oil pipe, interior oil pipe is located within the outer oil pipe, just interior oil pipe with form annular cavity between the outer oil pipe, the oil extraction pump with the first end of outer tube links to each other, the second end of outer tube with outer oil pipe links to each other, interior oil pipe with the inner tube links to each other.

In this application embodiment, oil pipe in the inner tube is used for connecting, the connecting piece is located to the movably cover of inner tube, when oil pipe need overhaul, oil pipe in can extracting outside to the oil well, interior oil pipe drives the inner tube and removes, make interior oil pipe drive the inner tube and break away from the connecting piece gradually, and remove outside the oil well, at this in-process, the connecting piece, outer tube and the oil recovery pump of connection on the outer tube are all stayed in the oil well, make the staff can directly overhaul interior oil pipe, and then simplify interior oil pipe's maintenance step. Therefore, the problem that in the related art, the inner oil pipe and the outer oil pipe of the oil extraction device are both in threaded connection with the oil extraction pump, and the maintenance steps of the inner oil pipe are complex is solved.

Drawings

Fig. 1 is a schematic structural diagram of a connector disclosed in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an oil recovery device disclosed in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a coiled tubing disclosed in an embodiment of the present application.

Description of the reference numerals:

100-connector, 110-inner pipe, 111-pipe section, 112-first pipe clamp, 120-outer pipe, 130-core pipe, 140-oil transportation space, 150-first sealing ring, 160-joint, 161-first fluid channel, 162-second fluid channel, 170-connecting ring, 180-filter pipe, 190-second pipe clamp,

200-oil extraction pump,

300-coiled tubing, 310-inner coiled tubing, 320-outer coiled tubing,

400-coiled tubing truck, 410-injection head,

500-Christmas tree,

600-a third pipe hoop,

700-fourth pipe clamp.

Detailed Description

The technical solutions in the embodiments of the present application will be described below clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived from the embodiments in the present application by a person skilled in the art, are within the scope of protection of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

Referring to fig. 1, the present embodiment discloses a connector for a production pump, and the disclosed connector 100 includes an inner tube 110, an outer tube 120, and a connector.

The inner pipe 110 is disposed inside the outer pipe 120, and an oil transportation space 140 is formed between the inner pipe 110 and the outer pipe 120. The first end of outer tube 120 is used for being connected with oil recovery pump 200, and oil transportation space 140 is used for communicating with oil recovery pump 200, and inner tube 110 is used for connecting interior oil pipe, and the second end of outer tube 120 is used for connecting outer oil pipe, and in specific oil recovery process, fluid in the oil well gets into in oil transportation space 140 through oil recovery pump 200 to get into between the annular chamber that interior oil pipe and outer oil pipe formed through oil transportation space 140, finally make fluid be carried outside the oil well through the annular chamber.

At least part of the connecting member is disposed in the inner tube 110, a first sealing ring 150 is disposed between the connecting member and the inner tube 110, the inner tube 110 is movably sleeved on the connecting member through the first sealing ring 150, a moving direction of the inner tube 110 is the same as an extending direction of the oil transportation space 140, an inner ring of the first sealing ring 150 is in sealing contact with an outer wall of the connecting member, and an outer ring of the first sealing ring 150 is in sealing contact with an inner wall of the inner tube 110. In this structure, the inner cavity of the inner tube 110 is isolated from the oil transportation space 140, so that the oil in the oil transportation space 140 is prevented from entering the inner portion of the inner tube 110. Alternatively, the first seal ring 150 may be a Y-shaped seal ring.

The connector is connected to the outer tube 120, and the inner tube 110 is movably sleeved on the connector, so that the inner tube 110 is movably connected to the outer tube 120 through the connector.

It should be noted that, when the external force applied to the inner tube 110 is greater than the predetermined external force, the inner tube 110 can move relative to the connecting member, and further move relative to the outer tube 120, and finally the inner tube 110 can move relative to the outer tube 120 and be separated from the outer tube 120 during maintenance. When the preset external force is larger than the acting force of the oil liquid on the extension direction of the inner tube 110 in the oil transportation space 140 when the oil liquid flows in the oil transportation space 140, the inner tube 110 is prevented from generating displacement under the driving of the oil liquid when the oil liquid flows in the oil transportation space 140, and the smooth operation of oil extraction work is prevented from being influenced.

In this application embodiment, inner tube 110 is used for connecting interior oil pipe, the connecting piece is located to the movably cover of inner tube 110, when interior oil pipe needs to overhaul, can be to extracting interior oil pipe outside the oil well, interior oil pipe drives inner tube 110 and removes, make interior oil pipe drive inner tube 110 and break away from the connecting piece gradually, and remove outside the oil well, inner tube 110 also breaks away from with outer tube 120 this moment certainly, at this in-process, the connecting piece, outer tube 120 and the oil recovery pump 200 of being connected with outer tube 120 all are stayed in the oil well, make the staff can directly overhaul interior oil pipe, owing to need not to take out all members from the oil well, consequently, the maintenance step of interior oil pipe can be simplified. Therefore, the problem that in the related art, the inner oil pipe and the outer oil pipe of the oil extraction device are both in threaded connection with the oil extraction pump, and the maintenance steps of the inner oil pipe are complex is solved.

In addition, the structure is convenient for cleaning the outer wall of the inner oil pipe, the outer wall of the inner pipe 110, the inner wall of the outer oil pipe and the inner wall of the outer pipe 120, and avoids the phenomenon that when the heavy oil well or the high-condensation oil well is subjected to oil extraction, oil is adhered to the inner oil pipe, the outer oil pipe, the inner pipe 110 or the outer pipe 120 to influence the normal operation of the oil extraction operation.

When cleaning operation is carried out, the inner pipe 110 can move relative to the connecting piece in the direction far away from the oil extraction pump 200 and is separated from the connecting piece, after the inner pipe 110 is away from the connecting piece by a preset distance, cleaning water is introduced into the inner pipe 110 and flows in the direction close to the oil extraction pump 200, and because liquid is arranged in an oil conveying passage of the oil extraction pump 200 communicated with the oil conveying space 140, the cleaning water cannot continuously flow in the original direction after flowing to the oil extraction pump 200, so that the flow direction of the cleaning water is changed and flows in the direction far away from the oil extraction pump 200 and sequentially flows through the outer pipe 120, a cavity between the inner pipe 110 and the outer oil pipe and an annular cavity between the inner oil pipe and the outer oil pipe so as to clean the outer wall of the inner oil pipe, the outer wall of the inner pipe 110, the inner wall of the outer oil pipe and the inner wall of the outer pipe 120.

Of course, the oil transportation path of the oil extraction pump 200 communicating with the oil transportation space 140 may also be provided with a one-way valve, so that the oil transportation path of the oil extraction pump 200 can only flow in the direction from inside the oil well to outside the oil well, and the cleaning water is prevented from flowing into the oil well through the oil extraction pump 200. The cleaning water can be pure water or cleaning solution added with special cleaning solution.

The configuration of the connector is various and in an alternative embodiment the connector may be a solid rod-like structure.

In an alternative embodiment, the connecting member may also be a core tube 130, i.e. a hollow tubular structure, and the inner cavity of the core tube 130 is isolated from the oil transportation space 140. When the connector 100 is connected to the oil production pump 200, the inner cavity of the core tube 130 may communicate with the oil production pump 200, and thus power fluid may be delivered into the oil well through the core tube 130. In this case, the core tube 130 can serve to connect the inner tube 110 and the outer tube 120 and also to transport the power fluid into the oil well. Further, in order to prevent impurities in the power fluid from entering the well, a filtering structure, such as a screen, may be disposed in the core pipe 130.

The oil extraction pump 200 has an oil delivery passage for delivering oil and a power fluid passage for delivering power fluid, the oil delivery passage of the oil extraction pump 200 communicates with the oil delivery space 140 of the connector, and the power fluid passage of the oil extraction pump 200 communicates with the inner cavity of the core tube 130. The specific structure of the oil recovery pump 200 is conventional and will not be described herein.

When the connector 100 and the production pump 200 are assembled, the outer tube 120 and the core tube 130 may be screwed to the production pump 200, respectively. However, it is known that the oil recovery pump 200 has a plurality of models, and the oil recovery pumps 200 of different models need to be adapted to inner and outer oil pipes with different diameters, and when the model of the oil recovery pump 200 is changed, the inner and outer oil pipes with different diameters need to be replaced, so that the inner and outer oil pipes with different diameters need to be prepared in order to be adapted to the oil recovery pumps 200 of different models, which may increase the cost of oil recovery operation.

In order to solve the above problem, in the embodiment of the present application, the connector 100 may further include a joint 160, a first end of the joint 160 is used to be connected to the oil production pump 200, a second end of the joint 160 is connected to a first end of the outer tube 120, the joint 160 is provided with a first fluid passage 161, the first fluid passage 161 is communicated with the oil transportation space 140, the core tube 130 is connected to the joint 160 so that the core tube 130 is connected to the outer tube 120 through the joint 160, the joint 160 is provided with a second fluid passage 162, and the second fluid passage 162 is communicated with the inner cavity of the core tube 130.

In this case, the size of the joint 160 can be changed to connect different types of the oil recovery pumps 200 and different diameters of the inner and outer oil pipes, so that the oil recovery pumps 200 can be more flexibly adapted to the inner and outer oil pipes.

Optionally, the second end of the joint 160 and the outer tube 120 may be connected by a second pipe clamp 190, one end of the second pipe clamp 190 is in threaded fit with the joint 160, the other end of the second pipe clamp 190 is in threaded fit with the outer tube 120, a second sealing ring may be disposed between the joint 160 and the second pipe clamp 190, a second annular groove may be formed in the second pipe clamp 190, and the second sealing ring may be disposed in the second annular groove. The first fluid passage 161 may be an annular passage that opens onto the fitting 160 and is disposed about the axis of the fitting 160. The second fluid passageway 162 may be an internal cavity that opens into the center of the fitting 160.

To accomplish the coupling of the core tube 130 to the coupling 160, the connector 100 may further include a coupling ring 170, the coupling 160 may be provided at an inner portion thereof with a mounting chamber, an outer ring of the coupling ring 170 is screw-engaged with an inner wall of the mounting chamber to couple the coupling ring 170 to the coupling 160, and an inner ring of the coupling ring 170 is screw-engaged with an outer wall of the core tube 130 such that the core tube 130 is coupled to the coupling 160 through the coupling ring 170. The axial direction of the connection ring 170 coincides with the axial direction of the core tube 130. The inner ring of the connection ring 170 communicates with the second fluid passage such that the cartridge tube 130 communicates with the second fluid passage 162.

Under the condition, the connection between the joint 160 and the connecting ring 170 and the connection between the connecting ring 170 and the core tube 130 are realized through a connection mode of threaded fit, the operation is simple and convenient, the disassembly and the assembly are convenient, and the overhaul of the joint 160, the connecting ring 170 and the core tube 130 is further facilitated.

In a further embodiment, the connector 100 may further include a filter tube 180, a filter structure, such as a filter screen, or other components with filtering function is disposed in the filter tube 180, a first end of the filter tube 180 is disposed in the connection ring 170 and is threadedly engaged with an inner wall of the connection ring 170, the first end of the filter tube 180 is communicated with the core tube 130, and a second end of the filter tube 180 is communicated with the second fluid passage 162. Under this kind of circumstances, compare in the technical scheme who sets up filter structure in core pipe 130, set up solitary filter tube 180 installation filter structure, more be convenient for to the maintenance of filter structure, and filter tube 180 threaded connection in go-between 170, the dismouting of filter tube 180 of being convenient for, and then the maintenance of filter tube 180 of being convenient for.

In the above solution, the inner tube 110 is movably sleeved on the connecting member through the first sealing ring 150, and when assembling, the connecting member can be sleeved with the first sealing ring 150 at first, and then the inner tube 110 is sleeved on the connecting member and the first sealing ring 150. However, this assembly method has many steps, and it is difficult to avoid the displacement of the first sealing ring 150 along with the movement of the inner tube 110 during the assembly of the inner tube 110.

To this end, in the embodiment of the present application, the inner pipe 110 may include a plurality of pipe segments 111 and a plurality of first pipe clamps 112, the plurality of pipe segments 111 may be sequentially connected by the first pipe clamps 112 (that is, two adjacent pipe segments 111 may be connected by the first pipe clamps 112, so as to realize the butt joint of the plurality of pipe segments 111), the first sealing ring 150 may be connected to an inner wall of the first pipe clamps 112, and the first sealing ring 150 and the first pipe clamps 112 are fixed relative to each other in an axial direction of the first pipe clamps 112. Alternatively, the number of the pipe sections 111 may be four, the number of the first pipe clamps 112 may be three, and each of the first pipe clamps 112 may be provided with a plurality of first sealing rings 150. In this case, it is possible to prevent the first seal ring 150 from being displaced by the movement of the inner tube 110 or the core tube 130 during the assembly of the inner tube 110 and the core tube 130, thereby preventing the sealing effect from being affected.

The first sealing ring 150 may be provided on the first pipe clamp 112 in various ways, for example, the first sealing ring 150 may be adhesively fixed to the inner wall of the first pipe clamp 112. Alternatively, a first annular groove may be formed in the inner wall of the first pipe clamp 112, the first annular groove is disposed around the axis of the first pipe clamp 112, and the first sealing ring 150 may be disposed in the first annular groove. Under the condition, the first sealing ring 150 is more convenient to mount, the first sealing ring 150 is arranged in the first annular groove, the first sealing ring 150 is more convenient to position and mount, and the distance between every two adjacent first sealing rings 150 can be more accurately controlled.

To facilitate connection of the connector 100 to the inner and outer tubing, respectively, the second end of the outer tube 120 may be provided with a third collar 600, the outer tube 120 may be connected to the outer tubing by the third collar 600, the inner tube 110 may be provided with a fourth collar 700, and the inner tube 110 may be connected to the inner tubing by the fourth collar 700.

Based on the connector of the above-mentioned embodiment of this application, this application embodiment still discloses an oil recovery device. Referring to fig. 2 to 3, the disclosed oil production apparatus includes an oil pipe, an oil production pump 200 and the connector 100 of any of the above embodiments, the oil pipe includes an inner oil pipe and an outer oil pipe, the inner oil pipe is disposed inside the outer oil pipe, an annular chamber is formed between the inner oil pipe and the outer oil pipe, oil circulates in the annular chamber, the oil production pump 200 is connected to a first end of the outer pipe 120, a second end of the outer pipe 120 is connected to the outer oil pipe, and the inner oil pipe is connected to the inner pipe 110. The derivation process of the beneficial effect generated by the oil extraction device is substantially similar to the derivation process of the beneficial effect brought by the connector, and therefore, the description is omitted here.

In a further embodiment, the connecting member is a core tube 130, and the inner cavity of the core tube 130 is isolated from the oil transportation space 140. The connector 100 further includes a joint 160, a first end of the joint 160 is adapted to be connected to the oil recovery pump 200, a second end of the joint 160 is connected to a first end of the outer tube 120, the joint 160 is provided with a first fluid passage 161, the first fluid passage 161 is communicated with the oil transfer space 140, the core tube 130 is connected to the joint 160 so that the core tube 130 is connected to the outer tube 120 through the joint 160, the joint 160 is provided with a second fluid passage 162, and the second fluid passage 162 is communicated with an inner cavity of the core tube 130. A first end of the joint 160 may be connected to the oil recovery pump 200 through a flange.

The inner oil pipe and the outer oil pipe can comprise a plurality of conventional oil pipes, and adjacent conventional oil pipes can be connected through the oil pipes by using joints.

In a specific pump-down process, firstly, a plurality of conventional oil pipes are conveyed to an oil well mouth from a pipe station through a pipe conveying vehicle to be distributed in a well site, the conventional oil pipes are sequentially placed at the oil well mouth, one conventional oil pipe is pulled up through a workover rig and then conveyed into a casing pipe in the oil well, and a worker manually connects two adjacent conventional oil pipes through a joint for the oil pipes. Whole pump operation down is consuming time longer, and needs the cooperation of a plurality of staff, wastes time and energy, and if the oil recovery pump needs to overhaul, still need to carry conventional oil pipe out to the oil well mouth according to above-mentioned step to demolish the joint of connecting two adjacent conventional oil pipes, the operation is complicated, and the maintenance degree of difficulty of oil recovery pump 200 is big.

To this end, in an alternative embodiment, the tubing may be coiled tubing 300, the inner tubing may be inner coiled tubing 310, and the outer tubing may be outer coiled tubing 320. The length of coiled tubing 300 is longer, can omit the process of connecting conventional oil pipe through the joint, and then promotes the pump unloading efficiency of oil production pump 200, reduces the degree of difficulty of pump unloading operation of oil production pump 200, reduces the maintenance degree of difficulty of oil production pump 200.

In addition, the conventional oil pipe is usually made of steel, the coiled oil pipe 300 is made of low-carbon alloy steel, the corrosion resistance of the coiled oil pipe 300 is superior to that of the conventional oil pipe, the weight of the coiled oil pipe 300 with the same length is smaller than that of the conventional oil pipe, the pumping depth can be increased by using the coiled oil pipe 300 under the condition that the maximum hanging weight of an oil well wellhead is fixed, a joint is not needed by using the coiled oil pipe 300, the overall weight of the coiled oil pipe 300 is further reduced, and the pumping depth of the coiled oil pipe 300 is further increased.

In a further embodiment, the oil extraction device comprises a coiled tubing truck 400, the coiled tubing truck 400 comprises a roller around which the coiled tubing 300 is wound and an injection head 410 for gripping and transporting the coiled tubing 300. The coiled tubing cart 400 is prior art and will not be described further herein.

In the specific pump-down process, drive coiled tubing truck 400 near the oil well, rise injection head 410, through injection head 410 automatic conveying coiled tubing 300, make coiled tubing 300 get into in the oil well behind production tree 500 through the setting of oil well wellhead, it is swift convenient, degree of automation is high, and the security is higher.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.

Claims (10)

1. A connector for a production pump, characterized in that the connector comprises an inner tube (110), an outer tube (120) and a connection, wherein:

the inner pipe (110) is arranged in the outer pipe (120), and an oil conveying space (140) is formed between the inner pipe (110) and the outer pipe (120);

at least part of the connecting piece is arranged in the inner pipe (110), a first sealing ring (150) is arranged between the connecting piece and the inner pipe (110), the inner pipe (110) is movably sleeved on the connecting piece through the first sealing ring (150), the inner ring of the first sealing ring (150) is in sealing contact with the outer wall of the connecting piece, and the outer ring of the first sealing ring (150) is in sealing contact with the inner wall of the inner pipe (110);

the connector is connected with the outer pipe (120) so that the inner pipe (110) is movably connected with the outer pipe (120) through the connector.

2. The connector of claim 1, wherein the connecting member is a core tube (130), and an inner cavity of the core tube (130) and the oil transportation space (140) are isolated from each other.

3. The connector according to claim 2, wherein the connector (100) further comprises a joint (160), a first end of the joint (160) is used for connecting with the oil production pump (200), a second end of the joint (160) is connected with a first end of the outer tube (120), the joint (160) is provided with a first fluid passage (161), the first fluid passage (161) is communicated with the oil delivery space (140), the core tube (130) is connected with the joint (160) so that the core tube (130) is connected with the outer tube (120) through the joint (160), the joint (160) is provided with a second fluid passage (162), and the second fluid passage (162) is communicated with an inner cavity of the core tube (130).

4. The connector according to claim 3, wherein the connector (100) further comprises a connection ring (170), the joint (160) is provided with a mounting chamber inside, an outer ring of the connection ring (170) is threadedly engaged with an inner wall of the mounting chamber, and an inner ring of the connection ring (170) is threadedly engaged with an outer wall of the core tube (130) such that the core tube (130) is connected to the joint (160) through the connection ring (170).

5. The connector of claim 4, wherein the connector (100) further comprises a filter tube (180), a filter structure being provided in the filter tube (180), a first end of the filter tube (180) being located in the connection ring (170) and being in threaded engagement with an inner wall of the connection ring (170), a first end of the filter tube (180) being in communication with the core tube (130), and a second end of the filter tube (180) being in communication with the second fluid passage (162).

6. The connector according to claim 1, wherein the inner pipe (110) comprises a plurality of pipe segments (111) and a plurality of first pipe clamps (112), the plurality of pipe segments (111) are sequentially connected through the first pipe clamps (112), the first sealing ring (150) is connected to the inner wall of the first pipe clamp (112), and the first sealing ring (150) and the first pipe clamp (112) are fixed relatively in the axial direction of the first pipe clamp (112).

7. The connector of claim 6, wherein the inner wall of the first pipe clamp (112) defines a first annular groove disposed about the axis of the first pipe clamp (112), the first sealing ring (150) being disposed within the first annular groove.

8. An oil recovery device comprising a tubing, a production pump (200) and a connector (100) according to any one of claims 1 to 7, the tubing comprising an inner tubing and an outer tubing, the inner tubing being arranged within the outer tubing and forming an annular chamber therebetween, the production pump (200) being connected to a first end of the outer tube (120), a second end of the outer tube (120) being connected to the outer tubing, and the inner tubing being connected to the inner tube (110).

9. The production unit of claim 8, wherein the tubing is coiled tubing (300), the inner tubing is inner coiled tubing (310), and the outer tubing is outer coiled tubing (320).

10. The production unit according to claim 9, characterized in that the production unit comprises a coiled tubing truck (400), the coiled tubing truck (400) comprising a drum around which the coiled tubing (300) is wound and an injection head (410), the injection head (410) being adapted to grip and transport the coiled tubing (300).

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