A cable seal joint for a cable packer and a packer

Abstract

The application provides a cable sealing joint for a cable-crossing packer. The sealing joint comprises a cable sealing joint body; a cable cavity arranged in the interior of the cable sealing joint body; a cable joint axially sealing the cable cavity and connected to the cable sealing joint body; a quick connector and a pressure cap assembly detachably receiving a cable and sealingly connecting two ends of the cable sealing joint body; wherein the cable cavity defines a first high-pressure sealing cavity and a second high-pressure sealing cavity, and is internally filled with high-temperature resistant sealing material for sealing. The cable sealing joint solves the problems in the prior art by sealing the sealing joint through multiple high-temperature sealing cavities filled with high-temperature resistant sealing material. The application also provides a cable-crossing packer comprising the cable sealing joint.

Description

Technical Field

[0001] This invention relates to the field of petroleum development technology, and more specifically to a cable sealing joint for a cable packer and a cable packer including the cable sealing joint. Background Technology

[0002] Currently, oilfield development technologies are gradually moving towards intelligent and refined processes. Pre-installed cable-based intelligent wellbore injection technology has significant technological advantages in real-time monitoring of production data and dynamic adjustment of production parameters, and is currently the main process in intelligent wellbore injection technology. Consequently, cable packers, which allow cables to pass through, have become a commonly used downhole tool in oilfield operations.

[0003] During on-site construction, the interior of the cable packer typically contains a plastic-sheathed cable running through the entire packer body, while the exterior is generally constructed using a steel conduit cable. The two types of cables are electrically connected by internal copper core welding. However, conventional cable joints cannot withstand the special environment of high temperature (approximately 120°C) and high pressure (approximately 80 MPa) inside water injection wells. During construction, water ingress into the cable joints frequently leads to short circuits or open circuits, which can range from affecting data transmission and requiring repeated construction to causing serious safety accidents.

[0004] Therefore, developing a cable joint with good sealing performance under high temperature and high pressure conditions has become an urgent technical problem to be solved in the field of petroleum development technology. Summary of the Invention

[0005] The purpose of this invention is to provide a cable sealing joint for use in cable packers, which solves the aforementioned problems in the prior art by using multiple high-temperature sealing cavities filled with high-temperature resistant sealing material to seal the joint. This invention also provides a cable packer incorporating this cable sealing joint.

[0006] According to the present invention, a cable sealing joint for use with a cable packer is provided, comprising:

[0007] The cable sealing joint body includes an upper open end and a lower open end that are opposite to each other along the axial direction;

[0008] The cable cavity is located inside the cable sealing joint body and extends axially to connect the upper opening end and the lower opening end;

[0009] A cable connector, which axially seals the cable cavity within the cable cavity and is connected to the cable sealing connector body;

[0010] Quick connectors detachably receive external cables and seal the opening at the connection point;

[0011] The clamping cap assembly detachably receives the built-in cable and seals the lower opening end of the connection;

[0012] The cable sealing joint body, cable joint, and quick connector define a first high-pressure sealing cavity, and the cable sealing joint body, cable joint, and cap assembly define a second high-pressure sealing cavity. The first and second high-pressure sealing cavities are filled with high-temperature resistant sealing material for sealing.

[0013] According to one embodiment of the present invention, the cable sealing joint body comprises:

[0014] The upper connector includes an upper open end and an upper connecting end opposite to the upper open end;

[0015] The lower connector includes a lower open end and a lower connecting end opposite the lower open end; and

[0016] The connecting section includes a first connecting end arranged along the axial direction, a section body, and a second connecting end.

[0017] The upper connecting end is detachably and sealed to the first connecting end, and the lower connecting end is detachably and sealed to the second connecting end.

[0018] According to one embodiment of the present invention, the cable sealing joint body includes a plurality of inner steps extending radially from the inner wall to define axial displacement of components located within the cable cavity, wherein the plurality of inner steps divide the cable cavity into a plurality of cable cavity segments with different radial dimensions.

[0019] According to one embodiment of the present invention, a cable connector includes an external cable connection end arranged axially, a cable connector body, and an internal cable connection end, wherein the cable connector body includes:

[0020] The connection portion that connects to the inner wall of the cable sealing joint body; and

[0021] A sealing part for axially sealed cable cavities.

[0022] According to one embodiment of the invention, the cable sealing joint further includes a straightening block for electrically connecting an external cable to an external cable connection end, wherein at least a portion of the radial dimension of the straightening block matches the radial dimension of a corresponding cable cavity segment to define the radial displacement of the straightening block.

[0023] According to one embodiment of the present invention, the straightening block comprises:

[0024] The cable receiving section adjacent to the upper opening end has a maximum radial dimension of its outer wall that matches the radial dimension of the corresponding cable cavity section, and the cable receiving section has a receiving opening inside.

[0025] The straightening block body extends axially from the cable receiving part toward the cable joint. The radial dimension of the outer wall of the straightening block body is smaller than the radial dimension of the corresponding cable cavity section to define at least a portion of the first high-pressure sealing cavity. The interior of the straightening block body is provided with an axially extending wire hole, wherein the radial dimension of the wire hole is smaller than the radial dimension of the cable receiving part.

[0026] The conductive part is connected to the inner wall of the main body of the straightening block and circumferentially surrounds the wire hole; and

[0027] The protrusion extends radially adjacent to the main body of the straightening block so that the radial dimension of the protrusion matches the radial dimension of the corresponding cable cavity section.

[0028] In this configuration, at least a portion of the external cable is inserted into the wire hole from the receiving opening and makes electrical contact with the conductive part, and the connecting end of the external cable is inserted into the wire hole from the end opposite to the receiving opening and makes electrical contact with the conductive part.

[0029] According to one embodiment of the invention, the cable sealing joint further includes a cable welding head for electrically connecting the built-in cable to the built-in cable connection end.

[0030] According to one embodiment of the present invention, the cable welding joint comprises:

[0031] The weld end adjacent to the lower opening end; and

[0032] The receiving end, which is opposite to the welding end, has a receiving groove inside;

[0033] The built-in cable is welded to the welding end, and the built-in cable connection end is inserted into the receiving groove to make electrical contact with the receiving end.

[0034] According to one embodiment of the present invention, the cable sealing joint further includes a sealing sleeve that circumferentially wraps around a portion of the built-in cable connection end, the cable weld head, and a portion of the built-in cable.

[0035] According to one embodiment of the present invention, the cable sealing joint further includes a backstop cap circumferentially sleeved on the built-in cable, wherein the two axially opposite ends of the backstop cap abut against a sealing sleeve and one of a plurality of inner stepped portions.

[0036] According to one embodiment of the present invention, the pressure cap assembly includes:

[0037] A pressure cap connected to the inner wall of the cable sealing joint body; and

[0038] A seal for axially sealing cable cavities.

[0039] According to the present invention, a cable packer is provided, comprising an upper packer connector, a lower packer connector, and a cable sealing connector as described above, wherein,

[0040] The cable sealing joint includes fastening components located outside the cable sealing joint body to securely connect the cable sealing joint to the cable packer.

[0041] At least one of the upper and lower packer connectors is provided with an offset cable perforation that connects the interior and exterior of the packer and has a mounting portion extending parallel to the packer's axis near the exterior of the packer. The cable sealing connector is coaxially inserted into the mounting portion and securely connected to the mounting portion in a sealed manner.

[0042] According to one embodiment of the present invention, the cable sealing joint and the cable perforation define a third high-pressure sealing cavity inside the communication packer, and the third high-pressure sealing cavity is filled with a high-temperature resistant sealing material for sealing.

[0043] By adopting the above technical solution, the present invention has at least the following beneficial effects:

[0044] 1. The cable sealing joint according to the present invention uses a first high-temperature sealing cavity and a second high-temperature sealing cavity filled with high-temperature resistant sealing material to effectively seal, ensuring sealing stability under high temperature and high pressure environment, preventing water ingress, and effectively avoiding short circuits;

[0045] 2. The components of the cable sealing joint according to the present invention are connected by a combination of fixed connection and plug-in connection, which results in a compact structure that is not easy to detach and effectively avoids circuit breakage;

[0046] 3. The cable sealing joint according to the present invention ensures effective connection of downhole cables and has a long service life;

[0047] 4. According to the present invention, the cable packer forms a third high-temperature sealing cavity filled with sealing material outside the installed cable sealing joint, further ensuring the sealing performance of the entire cable packer. Attached Figure Description

[0048] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0049] Figure 1 This is a schematic diagram of a packer according to an embodiment of the present invention;

[0050] Figure 2a This is a partially enlarged view of the upper half of a cable sealing joint according to an embodiment of the present invention;

[0051] Figure 2b This is a partially enlarged view of the lower half of a cable sealing joint according to an embodiment of the present invention;

[0052] Figure 3a This is a schematic diagram of the cable sealing joint body according to an embodiment of the present invention;

[0053] Figure 3b This is a cross-sectional view of the cable sealing joint body according to an embodiment of the present invention;

[0054] Figure 4 This is a schematic diagram of a cable connector according to an embodiment of the present invention;

[0055] Figure 5 This is a schematic diagram of a straightening block according to an embodiment of the present invention;

[0056] Figure 6 This is a schematic diagram of a welded joint according to an embodiment of the present invention.

[0057] In the picture,

[0058] 1. Cable sealing connector body, 11. Upper connector, 111. Upper open end, 112. Upper connecting end, 113. First inner step, 114. Second inner step, 115. First main body sealing groove, 12. First main body sealing element, 13. Connecting section, 131. First connecting end, 132. Section body, 133. Second connecting end, 134. First outer step, 14. Second main body sealing element, 15. Fastening component, 16. Third main body sealing element, 17. Lower connector, 171. Lower open end, 172. Lower connecting end, 173. Third inner step, 174. Fourth inner step, 175. Fifth inner step, 176. Sixth inner step, 177. Second outer step, 178. Second main body sealing groove, 179. Third main body sealing groove, 2. Cable connector, 21. External cable connection end, 22. Cable connector body, 221. Threaded connection. 222 Sealing part, 23 Built-in cable connection end, 3 Quick connector, 4 Pressure cap assembly, 41 Pressure cap, 42 Seal, 5 Straightening block, 51 Cable receiving part, 511 Receiving opening, 521 Wire hole, 52 Straightening block body, 53 Conductive part, 54 Protrusion, 6 Cable welding head, 61 Welding end, 62 Receiving end, 621 Receiving groove, 7 Sealing sleeve, 8 Anti-reverse cap, 9 Upper / lower connector for cable packer, 91 Cable perforation, A First high-pressure sealing cavity, B Second high-pressure sealing cavity, C Third high-pressure sealing cavity, H Cable cavity, H0 Middle section of cable cavity, H1 First section of cable cavity, H2 Second section of cable cavity, H3 Third section of cable cavity, H4 Fourth section of cable cavity, H5 Fifth section of cable cavity, H6 Sixth section of cable cavity, H7 Seventh section of cable cavity, H8 Eighth section of cable cavity, Cab1 External cable, Cab2 Built-in cable. Detailed Implementation

[0059] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0061] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0062] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] Figure 1 A schematic diagram of a cable packer according to an embodiment of the present invention is shown, comprising, as Figures 2a-2bThe cable sealing connector shown is illustrated. As shown, the cable sealing connector according to the present invention generally includes a cable sealing connector body 1, a cable cavity H disposed inside the cable sealing connector body 1, a cable connector 2 connected to the inner wall of the cable sealing connector body 1 within the cable cavity H, quick connectors 3 and a cap assembly 4 detachably connected to both ends of the cable sealing connector body 1, and a fastening member 15 disposed outside the cable sealing connector body 1 for connecting it to a cable packer. Specifically, the cable sealing connector body 1 includes an upper open end 111 and a lower open end 171 that are axially opposite to each other, and the cable cavity H extends axially to communicate with the upper and lower openings. The quick connector 3 detachably receives an external cable Cab1 and seals it to the upper open end 111, and the cap assembly 4 detachably receives an internal cable Cab2 and seals it to the lower open end 171. The cable sealing joint body 1, cable connector 2, and quick connector 3 define a first high-pressure sealing cavity A, and the cable sealing joint body 1, cable connector 2, and pressure cap assembly 4 define a second high-pressure sealing cavity B. Both the first high-pressure sealing cavity A and the second high-pressure sealing cavity B are sealed with a high-temperature resistant sealing material. In this embodiment of the invention, the high-temperature resistant sealing material can be high-temperature sealing silicone grease, ensuring both insulation and sealing performance. Using a high-temperature resistant sealing material effectively prevents high-pressure liquid from entering the sealing cavity in the high-temperature environment at the bottom of the well, avoiding failure of the cable sealing joint due to cable short circuits.

[0064] refer to Figure 3a and Figure 3bThe schematic diagram and cross-sectional view of the cable sealing connector body 1 shown indicate that the cable sealing connector body 1 may include an upper connector 11, a connecting section 13, and a lower connector 17 connected sequentially along the axial direction. The upper connector 11 includes an upper open end 111 and an upper connecting end 112 opposite to the upper open end 111; the lower connector 17 includes a lower open end 171 and a lower connecting end 172 opposite to the lower open end 171; the connecting section 13 includes a first connecting end 131 detachably and sealingly connected to the upper connecting end 112, a second connecting end 133 detachably and sealingly connected to the lower connecting end 172, and a section body 132 between the two. In an embodiment of the invention, the upper connector 11 has an external thread and a first body sealing groove 115 radially recessed from its outer wall near the upper connecting end 112. On one hand, the first connecting end 131 of the connecting segment 13 can be provided with a thread that matches the external thread at the upper connecting end 112, so that the upper connector 11 can be fixedly connected to the connecting segment 13 by the thread. On the other hand, a first main sealing member 12 can be provided in the first main sealing groove 115 of the upper connector 11, so that the first main sealing member 12 abuts against the inner wall of the connecting segment 13 when the connecting segment 13 and the upper connector 11 are threadedly connected, so as to achieve a seal between the outer wall of the upper connector 11 and the inner wall of the connecting segment 13. Similarly, the lower connecting end 172 of the lower connector 17 can also be configured to be threadedly connected to the second connecting end 133 of the connecting segment 13, and the seal between the outer wall of the lower connector 17 and the inner wall of the connecting segment 13 is achieved by the second main sealing member 14 provided in the second main sealing groove 178. The first main sealing member 12 and the second main sealing member 14 include, but are not limited to, sealing rings.

[0065] Further as Figure 3b As shown, the cable sealing joint body 1 may include a plurality of inner stepped portions extending radially from its inner wall. These inner stepped portions can be used to limit the axial displacement of components located within the cable cavity H, which may include a portion of the pressure cap assembly 4 as described above, as well as other components located within the cable cavity H as described in detail below. Furthermore, the plurality of inner steps can divide the cable cavity H into a plurality of cable cavity H segments with different radial dimensions to limit the radial displacement of components located within their respective cable cavity H segments, or to define different high-pressure sealing cavities.

[0066] Figure 4 A schematic diagram of a cable connector 2 according to an embodiment of the present invention is shown. The cable connector 2 generally comprises, in sequence along the axial direction: an external cable connection end 21 for electrically connecting an external cable Cab1, a cable connector body 22, and an internal cable connection end 23 for electrically connecting an internal cable Cab2. The cable connector body 22 may include a connecting portion connected to the inner wall of the cable sealing connector body 1 and a sealing portion 222 for axially sealing the cable cavity H. Figure 4In the illustrated embodiment, the connecting portion is adjacent to the external cable connection end 21 and is provided with an external thread. It can be threadedly connected to the cable sealing connector body 1 through the internal thread provided on the inner wall of the upper connector 11. The radial dimension of the sealing portion 222 can be matched with the radial dimension of the corresponding cable cavity H section (i.e., the cable cavity H section where the sealing portion 222 is located in the assembled state). The sealing performance between the cable connector 2 and the inner wall of the cable sealing connector body 1 is ensured by one or more sealing grooves that are radially recessed from the outer wall and sealing rings located in the sealing grooves, thereby achieving axial sealing of the cable cavity H.

[0067] Preferably, the cable sealing joint further includes a straightening block 5 that electrically connects the external cable Cab1 to the external cable connection end 21, wherein at least a portion of the radial dimension of the straightening block 5 matches the radial dimension of the corresponding cable cavity H section to limit the radial displacement of the straightening block 5. Figure 5 A schematic diagram of a straightening block 5 according to an embodiment of the present invention is shown. In this embodiment, the straightening block 5 includes a cable receiving portion 51 adjacent to an upper opening end 111, a straightening block body 52 extending axially from the cable receiving portion 51 toward a cable connector 2, a conductive portion 53, and a protrusion 54 extending radially from the straightening block body 52 adjacent to the cable connector 2. The maximum radial dimension of the outer wall of the cable receiving portion 51 matches the radial dimension of the corresponding cable cavity H segment, and the radial dimension of the protrusion 54 matches the radial dimension of its corresponding cable cavity H segment, thereby defining the radial displacement of the straightening block 5. The cable receiving portion 51 has a receiving opening 511 inside for receiving an external cable Cab1. The straightening block body 52 has an axially extending wire-passing hole 521 inside, which communicates with the receiving opening 511 and has a radial dimension smaller than that of the cable receiving opening. In embodiments of the present invention, the cable receiving portion 51, the straightening block body 52, and the protrusion 54 may be made of an insulating material such as polytetrafluoroethylene (PTFE). A conductive part 53, made of conductive material, is connected to the inner wall of the straightening block body 52 and circumferentially surrounds the wire hole 521. At least a portion of the external cable Cab1 is inserted into the wire hole 521 through the receiving opening 511 and makes electrical contact with the conductive part 53. The external cable connection end 21 is inserted into the wire hole 521 from the end opposite to the receiving opening 511 and makes electrical contact with the conductive part 53. Figure 5As shown, the portion of the external cable Cab1 near its end is needle-shaped, which is inserted into the threading hole 521 that matches its radial dimension and makes circumferential contact with the conductive part 53; the external cable connection end 21 of the cable connector 2 is also needle-shaped, inserted from the other end of the threading hole 521 and making circumferential contact with the conductive part 53. Thus, the external cable Cab1 and the cable connector 2 can achieve electrical connection without direct contact. Even if the external cable Cab1 undergoes axial displacement relative to the cable connector 2 due to vibration or other reasons during use, the electrical connection between them will not be affected. Further as... Figure 5 As shown, the radial dimension of the outer wall of the straightening block body 52 may be smaller than the radial dimension of the corresponding cable cavity H section, so as to define at least a portion of the first high-pressure sealing cavity A.

[0068] More preferably, the cable sealing joint further includes a cable welding head 6 that electrically connects the built-in cable Cab2 to the built-in cable connection end 23. Figure 6 A schematic diagram of a welding joint according to an embodiment of the present invention is shown. In this embodiment, the cable welding head 6 is made of a conductive material and includes: a welding end 61 adjacent to the lower opening end 171; and a receiving end 62 opposite to the welding end 61. The receiving end 62 has a receiving groove 621 inside. In use, the built-in cable Cab2 can be welded to the welding end 61, and the built-in cable connecting end 23 can be needle-shaped and inserted into the receiving groove 621 to make electrical contact with the receiving end 62. Figure 2b As shown, the cable sealing joint may further include a sealing sleeve 7 and a backlash cap 8 circumferentially fitted onto the built-in cable Cab2. The cable sealing sleeve 7 circumferentially wraps around a portion of the built-in cable connection end 23, the cable welding head 6, and a portion of the built-in cable Cab2 to ensure the stability of the connection between the three. The two axially opposite ends of the backlash cap 8 abut against the sealing sleeve 7 and an inner step, respectively, preventing axial movement of the sealing sleeve 7 and ensuring an effective connection between the cable joint 2, the cable welding head 6, and the built-in cable Cab2, thus preventing open circuits.

[0069] Return to Appendix Figure 2a and Figure 2b In an embodiment of the invention, the quick connector 3 can be threadedly connected to the upper open end 111 of the cable sealing connector body 1 to securely fasten the external cable Cab1 within the cable cavity H. The cap assembly 4 may include a cap 41 connected to the inner wall of the cable sealing connector body 1; and a seal 42 for axially sealing the cable cavity H. The cap 41 allows the internal cable Cab2 to pass through and is threadedly connected to the lower open end 171 of the cable sealing connector body 1; the seal 42, located in the cable cavity H section adjacent to the cap 41, may be in the form of a sealing ring, ensuring a seal between the internal cable Cab2 and the inner wall of the cable cavity H by radially abutting against them.

[0070] Combined with appendix Figure 2a and Figure 2b Continue to refer to Figure 3a and Figure 3b In this example of the invention, the inner wall of the upper connector 11 is provided with a first inner step portion 113 and a second inner step portion 114 sequentially from the upper opening end 111 toward the upper connecting end 112. The upper opening end 111 and the first inner step portion 113 define a cable cavity section H1, which accommodates the quick connector 3, the external cable Cab1, and a portion of the straightening block 5. The first inner step portion 113 and the second inner step portion 114 define a cable cavity section H2, which accommodates another portion of the straightening block 5 and the external cable connection end 21 of the cable connector 2. The radial dimension of the cable cavity section H2 is smaller than the radial dimension of the cable cavity section H1. The radial movement of the straightening block 5 is limited by the inner wall of the upper connector 11 at the cable cavity section H1, and the radial displacement is jointly limited by the external cable and the second inner step portion 114. The second inner step portion 114 and the upper connecting end 112 define a cable cavity section H3. The inner wall of the short section body 132 of the connecting short section 13 defines a middle section H0 of the cable cavity. The inner wall of the lower connector 17, from the lower connecting end 172 to the lower opening end 171, is provided with a third inner step portion 173, a fourth inner step portion 174, a fifth inner step portion 175, and a sixth inner step portion 176 in sequence. The lower connecting end 172 and the third inner step portion 173 define four sections H4 of the cable cavity. The radial dimensions of the three sections H3, the middle section H0, and the four sections H4 of the cable cavity are approximately the same, collectively accommodating the cable connector body 22 of the cable connector 2, the built-in cable connection end 23, the cable welding head 6, the sealing sleeve 7, the anti-reverse cap 8, and a portion of the built-in cable Cab2. The threaded connection portion 221 of the cable connector body 22 can be threaded to the inner wall of the upper connector 11 at the three sections H3 of the cable cavity. The end of the anti-reverse cap 8 away from the sealing sleeve 7 can abut against the third inner step portion 173 of the lower connector 17 to limit the axial movement of the cable connector 2, the cable welding head 6, the sealing sleeve 7, and the anti-reverse cap 8. The third inner step portion 173 and the fourth inner step portion 174 define five cable cavity segments H5, which can form part of the second high-pressure sealing cavity B. The fourth inner step portion 174 and the fifth inner step portion 175 define six cable cavity segments H6 that allow only the internal cable Cab2 to pass through. The fifth inner step and the sixth inner step define seven cable cavity segments H7, in which the seal 42 of the pressure cap assembly 4 is received. The sixth inner step and the lower opening end 171 define eight cable cavity segments H8, in which the pressure cap 41 is threaded to the lower connector 17. Alternatively, those skilled in the art can make adaptive adjustments to the types, shapes, and structures of the cable sealing joint components according to actual conditions.

[0071] In embodiments of the present invention, such as Figure 2b and Figure 3aAs shown, the fastening component 15 can be a fastening nut that is slidably fitted onto the outside of the cable sealing joint body 1, wherein the fastening nut can slide axially between a first outer step portion 134 and a second outer step portion 177 provided on the outer wall of the cable sealing joint body 1. The lower outer wall of the fastening nut is provided with external threads, which can be threaded to the cable packer. In this embodiment, the first outer step portion 134 on the outer wall of the cable sealing joint body 1 can be provided by the end face of the connecting section 13 adjacent to the lower joint 17, and the second outer step portion 177 can be provided by a protrusion extending radially from the outer wall of the lower joint 17. Further, one or more radially recessed third body sealing grooves can be provided on the outer wall of the lower joint 17 between the fastening component 15 and the lower opening. When the fastening component 15 is connected to the cable packer, the seal between the outer wall of the lower joint 17 and the cable packer can be achieved by a third body seal 16 provided in the third body sealing groove. The third body seal 16 includes, but is not limited to, a sealing ring.

[0072] Return to Figure 1 The present invention also provides a cable packer including the above-described cable sealing joint. The cable packer may include an upper packer joint and a lower packer joint, and the cable sealing joint according to the invention may be installed to at least one of the upper and lower packer joints. Taking the upper packer joint 9 as an example, it may have an offset cable through-hole 91 communicating between the interior and exterior of the packer and having a mounting portion extending parallel to the axis of the cable packer near the exterior of the packer, wherein the cable sealing joint is coaxially inserted into the mounting portion and securely connected to the mounting portion in a sealing manner. Preferably, the cable sealing joint and the cable through-hole 91 may together define a third high-pressure sealing cavity C communicating with the interior of the packer, and the third high-pressure sealing cavity C may be filled with a high-temperature resistant sealing material for sealing.

[0073] According to the present invention, the cable packer is sealed and protected by a first high-pressure sealing chamber A, a second high-pressure sealing chamber B and a third high-pressure sealing chamber C. In the high-temperature environment at the bottom of the well, it can effectively prevent high-pressure fluid from flowing into the joint and the cable packer, avoid short circuits and open circuits, and significantly increase the service life.

[0074] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0075] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0076] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A cable sealing joint for use with a cable packer, characterized in that, Include: A cable sealing joint body, the cable sealing joint body comprising an upper open end and a lower open end that are axially opposed to each other; A cable cavity is disposed inside the cable sealing joint body and extends axially to connect the upper opening end and the lower opening end. The cable cavity is divided into multiple cable cavity segments with different radial dimensions. A cable connector axially seals the cable cavity within the cable cavity and is connected to a cable sealing connector body. The cable connector includes an external cable connection end arranged along the axial direction, a cable connector body, an internal cable connection end, and a straightening block for electrically connecting the external cable to the external cable connection end. The radial dimension of at least a portion of the straightening block matches the radial dimension of a corresponding cable cavity segment to limit the radial displacement of the straightening block. Quick connector, which detachably receives an external cable and seals the upper opening; and A cap assembly that detachably receives an internal cable and seals the lower opening end; The cable sealing joint body, the cable joint, and the quick connector define a first high-pressure sealing cavity, and the cable sealing joint body, the cable joint, and the cap assembly define a second high-pressure sealing cavity. The first high-pressure sealing cavity and the second high-pressure sealing cavity are filled with high-temperature resistant sealing material for sealing. The straightening block includes: The cable receiving part adjacent to the upper opening end has a maximum radial dimension of the outer wall that matches the radial dimension of the corresponding cable cavity section, and the cable receiving part has a receiving opening inside. A straightening block body extending axially from the cable receiving part toward the cable joint, wherein the radial dimension of the outer wall of the straightening block body is smaller than the radial dimension of the corresponding cable cavity section to define at least a portion of the first high-pressure sealing cavity, and an axially extending wire hole is provided inside the straightening block body, wherein the radial dimension of the wire hole is smaller than the radial dimension of the cable receiving part. A conductive part, the conductive part being connected to the inner wall of the straightening block body and circumferentially surrounding the wire hole; and A protrusion that extends radially adjacent to the main body of the straightening block, such that the radial dimension of the protrusion matches the radial dimension of the corresponding cable cavity section; In this configuration, at least a portion of the external cable is inserted into the wire hole from the receiving opening and makes electrical contact with the conductive part, and the connecting end of the external cable is inserted into the wire hole from the end opposite to the receiving opening and makes electrical contact with the conductive part.

2. The cable sealing joint according to claim 1, characterized in that, The cable sealing joint body includes: The upper connector includes the upper open end and the upper connecting end opposite to the upper open end; The lower connector includes the lower open end and the lower connecting end opposite to the lower open end; as well as A connecting section, the connecting section comprising a first connecting end, a section body, and a second connecting end arranged along the axial direction; The upper connecting end is detachably and sealed to the first connecting end, and the lower connecting end is detachably and sealed to the second connecting end.

3. The cable sealing joint according to claim 1 or 2, characterized in that, The cable sealing joint body includes a plurality of inner steps extending radially from the inner wall to limit the axial displacement of components located within the cable cavity, wherein the plurality of inner steps divide the cable cavity into a plurality of cable cavity segments with different radial dimensions.

4. The cable sealing joint according to claim 3, characterized in that, The cable connector body includes: The connection portion connected to the inner wall of the cable sealing connector body; and The sealing part axially seals the cable cavity.

5. The cable sealing joint according to claim 1, characterized in that, The cable sealing joint further includes a cable welding head for electrically connecting the built-in cable to the built-in cable connection end.

6. The cable sealing joint according to claim 5, characterized in that, The cable welding joint includes: The welding end adjacent to the lower opening end; and The receiving end, which is opposite to the welding end, has a receiving groove inside. The built-in cable is welded to the welding end, and the connecting end of the built-in cable is inserted into the receiving groove and makes electrical contact with the receiving end.

7. The cable sealing joint according to claim 6, characterized in that, The cable sealing joint further includes a sealing sleeve that circumferentially wraps around a portion of the built-in cable connection end, the cable weld head, and a portion of the built-in cable.

8. The cable sealing joint according to claim 7, characterized in that, The cable sealing joint further includes a backstop cap circumferentially sleeved on the built-in cable, with the two axially opposite ends of the backstop cap abutting against the sealing sleeve and one of the plurality of inner stepped portions, respectively.

9. The cable sealing joint according to claim 3, characterized in that, The pressure cap assembly includes: A pressure cap connected to the inner wall of the cable sealing connector body; and A seal that axially seals the cable cavity.

10. A cable packer, characterized in that, It includes an upper packer connector, a lower packer connector, and a cable sealing connector according to any one of claims 1-9, wherein, The cable sealing joint includes a fastening component disposed outside the cable sealing joint body to securely connect the cable sealing joint to the cable packer. At least one of the upper and lower connectors of the packer is provided with an offset cable perforation, the cable perforation communicating between the interior and exterior of the packer and having a mounting portion extending parallel to the axis of the packer near the exterior of the cable packer, the cable sealing connector being coaxially inserted into the mounting portion and sealingly and securely connected to the mounting portion.

11. The cable packer according to claim 10, characterized in that, The cable sealing joint and the cable perforation define a third high-pressure sealing cavity inside the packer, which is filled with a high-temperature resistant sealing material for sealing.

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