Dropping and fishing cable and oil extraction equipment

Abstract

The invention relates to the technical field of oil extraction equipment, and discloses a throwing and fishing cable and oil extraction equipment. The throwing and fishing cable comprises an outer pipe, an inner pipe and a power cable. The inner pipe penetrates through the outer pipe, a wire passing cavity is formed between the inner pipe and the outer pipe, the first end of the inner pipe is used for being communicated with an oil pipe, and the second end of the inner pipe is used for being communicated with a liquid supply device. The power cable penetrates through the wire passing cavity. In this way, the cleaning effect on the interior of the oil pipe can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil production equipment, and in particular to a casting and fishing cable and oil production equipment. Background Art

[0002] As oilfield development progresses, the proportion of heavy oil, sand-bearing, and medium- and low-yield wells continues to increase. Cleaning foreign matter and dirt from the tubing of oil production equipment has become a key factor affecting the efficient development of the oilfield and the long-term stable operation of the equipment. As oil production equipment continues to develop, the requirements for its tubing cleaning capabilities are becoming increasingly stringent. Summary of the Invention

[0003] In view of the problems existing in the background technology, the purpose of this application is to provide a cable casting and oil production equipment to overcome the above problems or at least partially solve the above problems.

[0004] According to a first aspect of the present application, a fishing cable is provided, comprising an outer tube, an inner tube, and a power cable. The inner tube is inserted into the outer tube, with a cable lumen defined between the inner and outer tubes. A first end of the inner tube is connected to an oil pipe, and a second end of the inner tube is connected to a fluid supply device. The power cable is inserted into the cable lumen.

[0005] In one or more of the above optional embodiments, the fishing cable includes a sealing sleeve, which is provided at one end of the outer tube, through which the first end of the inner tube passes, and the first end of the power cable passes. The sealing sleeve is used to isolate the cable cavity from the oil pipe.

[0006] In one or more of the above optional embodiments, the sealing sleeve is provided with a first through hole and a second through hole, the first through hole being connected to the through-line cavity, the first end of the power cable passing through the first through hole and extending to the outside of the outer tube, and the first end of the inner tube passing through the second through hole and extending to the outside of the outer tube.

[0007] In one or more of the above optional embodiments, the sealing sleeve includes a sleeve body, a first extension post, and a second extension post. The sleeve body is sleeved onto one end of the outer tube, and the first extension post and the second extension post extend from the sleeve body in a direction away from the outer tube. The first through hole is provided in the first extension post, and the second through hole is provided in the second extension post.

[0008] In one or more of the above optional embodiments, a first sealing layer is provided between the power cable and the first through hole; and / or a second sealing layer is provided between the inner tube and the second through hole.

[0009] In one or more of the above optional embodiments, the salvage cable also includes a connecting sleeve, one end of which is sleeved on the outer tube, the first end of the inner tube and the first end of the power cable respectively extend to the interior of the connecting sleeve, and the interior of the connecting sleeve is used to communicate with the oil pipe.

[0010] In one or more optional embodiments above, a communicating hole is provided on the side wall of the connecting sleeve, and the communicating hole is communicated with the interior of the connecting sleeve, and the communicating hole is also used to communicate with the oil pipe.

[0011] In one or more optional embodiments above, the casting cable further includes an electrical connector, which is provided at one end of the connecting sleeve away from the outer tube, and is electrically connected to the first end of the power cable.

[0012] In one or more optional embodiments above, the casting and salvaging cable further includes a transition sleeve, the transition sleeve is sleeved on the outer tube, and one end of the connecting sleeve is sleeved on the transition sleeve.

[0013] In one or more of the above optional embodiments, the casting cable further includes an adapter, one end of which is sleeved on the second end of the inner tube, and the other end of the adapter is used to connect to the liquid supply device.

[0014] According to the second aspect of the present application, an oil production equipment is provided, comprising: an oil pipe, a liquid supply device and the above-mentioned salvaging cable, wherein the first end of the inner tube of the salvaging cable is connected to the oil pipe, and the second end of the inner tube is connected to the liquid supply device.

[0015] In one or more optional embodiments above, the liquid supply device includes a liquid supply pump, a connecting pipe and a valve, the two ends of the connecting pipe are respectively connected to the liquid supply pump and the inner pipe, and the valve is arranged on the connecting pipe.

[0016] In one or more of the above optional embodiments, the oil production equipment also includes a submersible pump, which is connected to the end of the oil pipe away from the salvage cable, and the first end of the power cable is electrically connected to the submersible pump; and / or the oil production equipment also includes a control cabinet, and the second end of the power cable is electrically connected to the control cabinet.

[0017] The beneficial effects of the embodiments of the present application are as follows: the salvaging cable provided by the embodiments of the present application, by arranging an inner tube inside the outer tube of the salvaging cable, when applied to oil production equipment, the inner tube is located inside the oil pipe, and the heat loss is small when the cleaning fluid flows through the inner tube, and the heat of the cleaning fluid can be transferred to the oil pipe through the inner tube and the outer tube, thereby heating the dirt and foreign matter in the oil pipe. Compared with the method in the related art in which the well washing pipeline is separately arranged outside the oil pipe, this is beneficial to reducing the loss of heat of the cleaning fluid and improving the cleaning effect on the inside of the oil pipe. On the other hand, by integrating the inner tube into the outer tube of the salvaging cable, there is no need to set an additional well washing valve at the oil pipe, which is beneficial to reducing the problem of failure of the cleaning function of the oil production equipment due to the obstruction of the well washing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0019] Figure 1 A schematic diagram of an oil production equipment provided in an embodiment of the present application; Figure 2 A schematic cross-sectional view of a casting and fishing cable provided in an embodiment of the present application; Figure 3 A partial schematic diagram of a casting and fishing cable provided in an embodiment of the present application; Figure 4 A schematic diagram of the connection between a casting and fishing cable and components of a liquid supply device provided in an embodiment of the present application; Figure 5 A schematic diagram of a sealing sleeve for a fishing cable provided in an embodiment of the present application; Figure 6 A partial exploded view of a fishing cable provided in an embodiment of the present application; Figure 7 for Figure 1 Enlarged view of point A in the middle; Figure 8 A partial schematic diagram of a casting and fishing cable provided in an embodiment of the present application; Figure 9 A schematic cross-sectional view of an adapter for oil production equipment provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to facilitate understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0022] In this specification, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0023] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0024] In the related art, the oil pipe of the oil production equipment is divided into two sections, and a well washing valve is connected in the middle of the two sections of the oil pipe. The well washing pipe of the oil production equipment is connected to the well washing valve outside the oil pipe. When the oil pipe needs to be cleaned, the pressure pump of the oil production equipment delivers cleaning fluid to the well washing valve through the inner pipe. When the pressure of the cleaning fluid leading to the well washing valve reaches the pressure value for opening the well washing valve, the well washing valve connects the well washing pipe and the oil pipe, and the cleaning fluid enters the oil pipe to clean stains and foreign matter.

[0025] The inventors of this application have found that in order to improve the cleaning effect, high-temperature liquid is usually used as the cleaning fluid. However, since the well washing pipeline has a long distance from the ground to the side of the well washing valve, the cleaning fluid will lose a lot of heat in the process of flowing to the well washing valve, which in turn leads to a decrease in the cleaning effect. On the other hand, the well washing valve installed on the oil pipe is immersed in the well fluid for a long time, and foreign matter in the well fluid enters the well washing valve, which can easily cause the well washing valve to get stuck and unable to open, thereby causing the cleaning function of the oil production equipment to fail.

[0026] Based on this, see Figures 1-4 The present invention provides a fishing cable 100 comprising an outer tube 1, an inner tube 3, and a power cable 2. The inner tube 3 is inserted through the outer tube 1, with a cable lumen defined between the inner tube 3 and the outer tube 1. A first end 3a of the inner tube 3 is connected to an oil pipe 200, and a second end 3b of the inner tube 3 is connected to a fluid supply device 300. The power cable 2 is inserted through the cable lumen.

[0027] When applied to the oil production equipment 1000, the fishing cable 100 is arranged in the oil pipe 200 of the oil production equipment 1000. During operation, the cleaning liquid output by the liquid supply device 300 enters the oil pipe 200 through the inner tube 3 to clean stains and foreign matter.

[0028] The salvaging cable 100 provided in the embodiment of the present application, by arranging an inner tube 3 inside the outer tube 1 of the salvaging cable 100, when applied to the oil production equipment 1000, the inner tube 3 is located inside the oil pipe 200, and the heat loss of the cleaning fluid is small when flowing through the inner tube 3, and the heat of the cleaning fluid can be transferred to the oil pipe 200 through the inner tube 3 and the outer tube 1, thereby heating the dirt and foreign matter in the oil pipe 200. Compared with the method in which the well washing pipeline is separately arranged outside the oil pipe 200 in the related art, it is beneficial to reduce the loss of heat of the cleaning fluid and improve the cleaning effect of the inside of the oil pipe 200. On the other hand, by integrating the inner tube 3 into the outer tube 1 of the salvaging cable 100, there is no need to set an additional well washing valve at the oil pipe 200, which is beneficial to reducing the problem of failure of the cleaning function of the oil production equipment 1000 due to the obstruction of the well washing valve.

[0029] In some embodiments, the inner tube 3 is a steel tube. Compared with other materials, steel tubes have better compressive strength and corrosion resistance, which is conducive to improving the service life of the inner tube 3.

[0030] See also Figure 2 In some embodiments, the fishing cable 100 includes an insulating filler 4, which is filled in the wire cavity to seal the wire cavity and fix the power cable 2 and the inner tube 3.

[0031] In some embodiments, the insulating filler 4 is made of a material with insulating and thermally conductive properties, such as thermally conductive plastic. While meeting the insulation requirements, it is also beneficial for the heat of the cleaning fluid in the inner tube 3 to be transferred to the outside of the outer tube 1 to heat the oil in the oil pipe 200.

[0032] It can be understood that the insulating filler 4 can be a single integral structure as shown in the figure, or it can be a multi-layer arrangement made of the same material or a variety of different materials. The insulating filler 4 can be solid, or it can be a mixture of solid and liquid, such as filling insulating oil in a solid insulating structure, and can be set according to actual needs.

[0033] In some embodiments, there are three power cables 2 , and the three power cables 2 are arranged around the inner tube 3 along the circumference of the inner tube 3 .

[0034] In some embodiments, along the circumference of the inner tube 3 , the intervals between the three power cables 2 are the same, and along the radial direction of the inner tube 3 , the intervals between the three power cables 2 and the inner tube 3 are the same.

[0035] In some embodiments, the outer tube 1 is a steel tube. Steel tubes offer excellent compressive strength and corrosion resistance, protecting the power cable 2 from extrusion, impact, and abrasion. They also prevent the intrusion of moisture, chemicals, and other corrosive media, ensuring long-term, stable operation of the cable in harsh environments. The outer tube 1 is made of a high-strength material, such as stainless steel. While forming a channel for accommodating the power cable 2 and inner tube 3, it also serves as an armored protective structure for the power cable 2 and inner tube 3.

[0036] In some embodiments, the inner circumferential wall of the outer tube 1 is provided with a first insulating layer 5 ; and / or the outer circumferential wall of the power cable 2 is provided with a second insulating layer 6 .

[0037] In some embodiments, the first insulating layer 5 includes but is not limited to being made of fluoroethylene propylene (FEP) material.

[0038] In some embodiments, the second insulating layer 6 includes but is not limited to being made of fluoroethylene propylene (FEP) material.

[0039] See also Figure 3 and Figure 5 In some embodiments, the fishing cable 100 includes a sealing sleeve 7, which is disposed at the first end 1a of the outer tube 1. The first end 3a of the inner tube 3 passes through the sealing sleeve 7, and the first end 2a of the power cable 2 also passes through the sealing sleeve 7. The sealing sleeve 7 is used to isolate the cable lumen from the oil pipe 200. The provision of the sealing sleeve 7 helps reduce the risk of well fluid in the oil pipe 200 downhole entering the cable lumen in the outer tube 1 during use, and then seeping through gaps or holes in the lumen to the wellhead, causing environmental contamination.

[0040] In some embodiments, the sealing sleeve 7 is provided with a first through hole 71 and a second through hole 72. The first through hole 71 communicates with the wire passage cavity between the inner tube 3 and the outer tube 1. The first end 2a of the power cable 2 passes through the first through hole 71 and extends to the outside of the outer tube 1. The first end 3a of the inner tube 3 passes through the second through hole 72 and extends to the outside of the outer tube 1.

[0041] In some embodiments, the sealing sleeve 7 includes a sleeve body 73, a first extension post 74, and a second extension post 75. The sleeve body 73 is sleeved on the first end 1a of the outer tube 1. The first extension post 74 and the second extension post 75 extend from the sleeve body 73 in a direction away from the outer tube 1. The first through hole 71 is provided in the first extension post 74, and the second through hole 72 is provided in the second extension post 75.

[0042] In some embodiments, the insulating filler 4 fills the internal space of the sleeve 73 to resist the pressure exerted by the external oil on the sleeve 73, which helps to reduce the problem of deformation and damage of the sleeve 73 due to pressure.

[0043] In some embodiments, the number of power cables 2 is three, the number of first through holes 71 is correspondingly set to three, the number of first extension columns 74 is the same as the number of power cables 2, the three first extension columns 74 are arranged around the second extension column 75 along the axial direction of the second through hole 72, and the three power cables 2 are correspondingly passed through the three first through holes 71.

[0044] In some embodiments, a first sealing layer (not shown) is provided between the power cable 2 and the first through hole 71, and / or a second sealing layer (not shown) is provided between the inner tube 3 and the second through hole 72. The provision of the first sealing layer facilitates improved sealing between the first through hole 71 and the power cable 2, while the provision of the second sealing layer facilitates improved sealing between the second through hole 72 and the inner tube 3.

[0045] In some embodiments, the first sealing layer is a waterproof tape, and the first sealing layer is wound around the outer wall of the power cable 2 in the first through hole 71 along the extension direction of the power cable 2 .

[0046] In some embodiments, the second sealing layer is a waterproof tape, and the second sealing layer is wound around the outer wall of the inner tube 3 in the second through hole 72 along the extension direction of the inner tube 3 .

[0047] See also Figure 6 and Figure 7 In some embodiments, the fishing cable 100 further includes a connecting sleeve 9. The first end 9a of the connecting sleeve 9 is sleeved onto the outer tube 1. The first end 3a of the inner tube 3 and the first end 2a of the power cable 2 extend into the interior of the connecting sleeve 9. The interior of the connecting sleeve 9 is configured to communicate with the oil pipe 200. During operation, the connecting sleeve 9 is placed within the oil pipe 200. The cleaning fluid provided by the liquid supply device 300 flows through the first end 3a of the inner tube 3, enters the interior of the connecting sleeve 9, and then enters the oil pipe 200 through the connection between the interior of the connecting sleeve 9 and the oil pipe 200.

[0048] In some embodiments, a connecting hole 92 is provided on the side wall of the connecting sleeve 9 . The connecting hole 92 is connected to the interior of the connecting sleeve 9 . The connecting hole 92 is also used to connect to the oil pipe 200 .

[0049] See also Figure 1 、 Figure 7 and Figure 8 In some embodiments, the salvage cable 100 further includes an electrical connector 10, which is disposed at the second end 9b of the connecting sleeve 9. The electrical connector 10 is electrically connected to the first end 2a of the power cable 2, and the electrical connector 10 is used to electrically connect to the submersible pump 400.

[0050] See also Figure 8 and Figure 9In some embodiments, the electrical connector 10 is provided with jacks 101, the number of which is the same as the number of the power cables 2 and they are electrically connected one-to-one. The jacks 101 are used to connect with pins 9021 on the socket 902 of the submersible pump 400, which are the same in number and correspond one-to-one to the jacks 101, so as to electrically connect the power cable 2 with the submersible pump 400.

[0051] See also Figure 6 and Figure 7 In some embodiments, the fishing cable 100 further includes a transition sleeve 8 , which is sleeved on the outer tube 1 , and the first end 9 a of the connecting sleeve 9 is sleeved on the transition sleeve 8 .

[0052] In some embodiments, the outer wall of the first end 1a of the outer tube 1 is welded to the inner wall of the adapter sleeve 8. It is understood that in other embodiments, the adapter sleeve 8 can also be connected to the outer tube 1 by threaded connection, bonding, fastener connection, etc.

[0053] In some embodiments, the outer wall of the adapter sleeve 8 is provided with an external thread, and the first end 9a of the connecting sleeve 9 is provided with an internal thread. The external thread of the outer wall of the adapter sleeve 8 is threadedly fixed to the internal thread of the first end 9a of the connecting sleeve 9.

[0054] It can be understood that the connection method between the adapter sleeve 8 and the connecting sleeve 9 is not limited to the above-mentioned method. For example, in other embodiments, the inner wall of the adapter sleeve 8 is provided with an internal thread, and the outer wall of the first end 9a of the connecting sleeve 9 is provided with an external thread, and the internal thread of the adapter sleeve 8 is threadedly fixed to the external thread of the connecting sleeve 9; or in other embodiments, the adapter sleeve 8 can also be fixed to the connecting sleeve 9 by welding, bonding, fastener connection, etc.

[0055] It can also be understood that the first end 1a of the outer tube 1 is not limited to being indirectly connected to the first end 9a of the connecting sleeve 9 through the adapter sleeve 8. In other embodiments, the first end 1a of the outer tube 1 can also be directly connected to the first end 9a of the connecting sleeve 9, for example, the outer wall of the first end 1a of the outer tube 1 is directly welded to the inner wall of the first end 9a of the connecting sleeve 9.

[0056] In other embodiments, an elastic tube clamp (not shown) is provided on the inner wall of the first end 9a of the connecting sleeve 9. The first end 1a of the outer tube 1 is inserted into the first end 9a of the connecting sleeve 9. The outer wall of the first end 1a of the outer tube 1 stretches the elastic tube clamp, which applies an elastic force toward the outer tube 1 along the radial direction of the outer tube 1 to secure the outer tube 1. Furthermore, in some embodiments, the surface of the elastic tube clamp facing the outer tube 1 is provided with a serrated protrusion, which is used to increase friction between the outer wall of the first end 1a of the outer tube 1 and the elastic tube clamp.

[0057] In some embodiments, the connecting sleeve 9 is generally a tubular structure with openings at both ends. The connecting sleeve 9 is provided with a first connecting cavity 91. The openings at both ends of the connecting sleeve 9 are respectively connected to the first connecting cavity 91. The connecting sleeve 9 is sleeved on the adapter sleeve 8 through the opening provided at the first end 9a of the connecting sleeve 9, and the electrical connector 10 is provided at the opening of the second end 9b of the connecting sleeve 9.

[0058] In some embodiments, the first end 1a of the outer tube 1 extends into the first communicating cavity 91 , the sealing sleeve 7 is located in the first communicating cavity 91 , and the first end 3a of the inner tube 3 extends out of the sealing sleeve 7 to communicate with the first communicating cavity 91 .

[0059] See also Figure 1 and Figure 4 In some embodiments, the fishing cable 100 further includes an adapter 11 , one end of the adapter 11 is sleeved on the second end 3 b of the inner tube 3 , and the other end of the adapter 11 is used to connect to the liquid supply device 300 .

[0060] In some embodiments, a sealing ring (not shown) is provided between the inner wall of the end of the adapter 11 away from the liquid supply device 300 and the outer wall of the second end 3b of the inner tube 3, and / or the outer wall of the second end 3b of the inner tube 3 is welded to the inner wall of the end of the sealing joint away from the liquid supply device 300.

[0061] See also Figure 1 、 Figure 4 and Figure 7 Based on the same inventive concept, the present application also provides an oil production equipment 1000, including an oil pipe 200, a liquid supply device 300 and a salvage cable 100 in any of the above embodiments, wherein the first end 3a of the inner tube 3 of the salvage cable 100 is connected to the oil pipe 200, and the second end 3b of the inner tube 3 is connected to the liquid supply device 300.

[0062] In some embodiments, the liquid supply device 300 includes a liquid supply pump 330 , a connecting pipe 340 and a valve 310 . The two ends of the connecting pipe 340 are respectively connected to the liquid supply pump 330 and the inner tube 3 . The valve 310 is arranged on the connecting pipe 340 .

[0063] In some embodiments, the liquid supply device 300 includes a one-way valve 320 , which is disposed between the inner tube 3 and the liquid supply pump 330 . The one-way valve 320 is used to allow the cleaning liquid output by the liquid supply pump 330 to flow to the inner tube 3 .

[0064] In some embodiments, one end of the valve 310 is connected to the second end 3b of the inner tube 3 , one end of the one-way valve 320 is connected to the other end of the valve 310 , and the other end of the one-way valve 320 is connected to the liquid supply pump 330 through the connecting pipe 340 .

[0065] In some embodiments, the valve 310 is provided with a connector (not shown) at one end facing the inner tube 3, and the adapter 11 is sleeved on the end away from the inner tube 3. The connector is provided with a mounting hole, and the second end 3b of the inner tube 3 is inserted into the mounting hole in the adapter 11.

[0066] In some embodiments, the oil production equipment 1000 further includes a submersible pump 400 , which is connected to the end of the oil pipe 200 away from the casting cable 100 , and the first end 2 a of the power cable 2 is electrically connected to the submersible pump 400 .

[0067] In some embodiments, the oil production equipment 1000 further includes a control cabinet 500 , and the second end 2 b of the power cable 2 is electrically connected to the control cabinet 500 .

[0068] In some embodiments, the oil production equipment 1000 further includes a junction box 600 , and the second end b of the power cable 2 extends out of the outer tube 1 through the second end 1 b of the outer tube 1 and is connected to the junction box 600 , which is connected to the control cabinet 500 .

[0069] In some embodiments, oil production equipment 1000 includes casing 700 and a Christmas tree 800. Casing 700 is installed in an oil well, and the space within casing 700 provides operating space for a submersible pump 400. Christmas tree 800 is installed at the wellhead of the oil well. One end of Christmas tree 800 is connected to the end of casing 700 located at the wellhead. Submersible pump 400 and oil pipe 200 are installed within casing 700. One end of oil pipe 200 is connected to Christmas tree 800, and the other end of oil pipe 200 is connected to submersible pump 400. The outer pipe 1, inner pipe 3, and power cable 2 all pass through Christmas tree 800 and into oil pipe 200.

[0070] See also Figure 1 and Figure 9 In some embodiments, the oil production equipment 1000 includes an adapter 900, a first end of the adapter 900 is connected to the submersible pump 400, a second end of the adapter 900 is connected to an end of the oil pipe 200 away from the oil tree 800, and the adapter 900 is provided with a second connecting cavity 901, which connects the oil outlet of the submersible pump 400 with the end of the oil pipe 200 away from the oil tree 800.

[0071] In some embodiments, an isolation sleeve 903 is provided in the second communication cavity 901 , the socket 902 is provided in the isolation sleeve 903 , and the electrical connector 10 is plugged into the socket 902 in the isolation sleeve 903 .

[0072] In some embodiments, the inner wall of the second end of the adapter 900 is provided with an internal thread, and the outer wall of the end of the oil pipe 200 away from the oil tree 800 is provided with an external thread. The external thread of the outer wall of the end of the oil pipe 200 away from the oil tree 800 is screwed and fixed to the inner thread of the inner wall of the second end of the adapter 900.

[0073] To facilitate readers' understanding of the present invention, the following fully describes the working principle of an oil production device 1000 provided in an embodiment of the present application: During operation, the control cabinet 500 controls the submersible pump 400 to extract well fluid from the casing 700. The fluid then passes through the second connecting chamber 901 of the adapter 900 and enters the end of the oil pipe 200 away from the Christmas tree 800. The well fluid then flows from the end of the oil pipe 200 away from the Christmas tree 800 to the end of the oil pipe 200 near the Christmas tree 800. When the oil pipe 200 needs to be cleaned, the valve 310 is opened, and the liquid supply pump 330 pressurizes the cleaning fluid. The fluid then flows through the connecting pipe 340, the one-way valve 320, and the valve 310, and enters the second end 3b of the inner tube 3. After reaching the first end 3a of the inner tube 3, the cleaning fluid enters the first connecting chamber 91 at the mouth of the first end 3a of the inner tube 3, and then enters the end of the oil pipe 200 away from the Christmas tree 800 through the connecting hole 92. The cleaning fluid mixes with the well fluid and flows together with the well fluid toward the end of the oil pipe 200 near the Christmas tree 800. After entering the Christmas tree 800, the cleaning fluid is ultimately discharged together. When the well cleaning work is completed, valve 310 is closed.

[0074] It is understandable that the destination of the cleaning fluid after discharge can be set according to actual needs. It can be discharged to a specially set storage device, or returned to the liquid supply device 300 after being separated from the well fluid, etc.

[0075] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A fishing cable, characterized in that: include: External control; An inner tube is passed through the outer tube, a wire passage cavity is provided between the inner tube and the outer tube, a first end of the inner tube is used to communicate with the oil pipe, and a second end of the inner tube is used to communicate with the liquid supply device; The power cable is passed through the cable cavity.

2. The fishing cable according to claim 1, characterized in that: The fishing cable includes a sealing sleeve, which is provided at one end of the outer tube, the first end of the inner tube passes through the sealing sleeve, and the first end of the power cable passes through the sealing sleeve; The sealing sleeve is used to isolate the wire passage cavity from the oil pipe.

3. The fishing cable according to claim 2, characterized in that: The sealing sleeve is provided with a first through hole and a second through hole, wherein the first through hole is connected to the wire passage cavity; The first end of the power cable passes through the first through hole and extends to the outside of the outer tube, and the first end of the inner tube passes through the second through hole and extends to the outside of the outer tube.

4. The fishing cable according to claim 3, characterized in that: The sealing sleeve includes a sleeve body, a first extension column and a second extension column, wherein the sleeve body is sleeved on one end of the outer tube, and the first extension column and the second extension column extend from the sleeve body in a direction away from the outer tube respectively; The first through hole is disposed on the first extension column, and the second through hole is disposed on the second extension column.

5. The fishing cable according to claim 3, characterized in that: A first sealing layer is provided between the power cable and the first through hole; and / or A second sealing layer is provided between the inner tube and the second through hole.

6. The fishing cable according to any one of claims 1 to 5, characterized in that: The casting and salvaging cable also includes a connecting sleeve, one end of which is sleeved on the outer tube, the first end of the inner tube and the first end of the power cable respectively extend into the interior of the connecting sleeve, and the interior of the connecting sleeve is used to communicate with the oil pipe.

7. The fishing cable according to claim 6, characterized in that: A communicating hole is provided on the side wall of the connecting sleeve. The communicating hole is communicated with the interior of the connecting sleeve and is also used to communicate with the oil pipe.

8. The fishing cable according to claim 6, characterized in that: The casting cable further includes an electrical connector, which is provided at one end of the connecting sleeve away from the outer tube, and is electrically connected to the first end of the power cable.

9. The casting and fishing cable according to claim 6, characterized in that: The casting and fishing cable further comprises a transition sleeve, which is sleeved on the outer tube, and one end of the connecting sleeve is sleeved on the transition sleeve.

10. The fishing cable according to any one of claims 1 to 5, characterized in that: The casting and fishing cable further comprises an adapter, one end of which is sleeved on the second end of the inner tube, and the other end of which is used to be connected to a liquid supply device.

11. An oil production equipment, characterized in that: include: oil pipelines; Liquid supply device; The salvage cable according to any one of claims 1 to 10, wherein a first end of an inner tube of the salvage cable is connected to the oil pipe, and a second end of the inner tube is connected to the liquid supply device.

12. The oil production equipment according to claim 11, characterized in that: The liquid supply device includes a liquid supply pump, a connecting pipe and a valve. The two ends of the connecting pipe are respectively connected to the liquid supply pump and the inner pipe. The valve is arranged on the connecting pipe.

13. The oil production equipment according to any one of claims 11 to 12, characterized in that: The oil production equipment further includes a submersible pump, the submersible pump is connected to an end of the oil pipe away from the casting cable, and the first end of the power cable is electrically connected to the submersible pump; and / or The oil production equipment further includes a control cabinet, and the second end of the power cable is electrically connected to the control cabinet.

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