Underground single-plug cable penetrating device

Abstract

The utility model relates to the technical field of cable penetrating devices, and discloses an underground single-plug cable penetrating device, which comprises a straight plug and a penetrating device main body detachably connected with the straight plug, and is characterized in that the penetrating device main body comprises a first shell with external threads and a first insulating conducting rod which is fixed in the first shell and protrudes outwards; and the straight plug comprises a second insulating conducting rod, a front joint connected with the second insulating conducting rod, and a connecting screw cap which is positioned on the outer side of the front joint and is provided with an internal thread. The beneficial effects of the underground single-plug cable penetrating device are that the straight plug and the cable penetrating device main body are in clamping threaded connection, so that rapid installation of the straight plug and the cable penetrating device main body is realized. According to the specific structure, rapid positioning is achieved through the first insulation conducting rod and the front connector, and the stability of structural connection is achieved through threaded matching connection of the first shell and the connecting screw cap.

Description

Technical Field

[0001] The utility model relates to the technical field of cable crossers, in particular to an underground single-plug cable crosser. Background Art

[0002] The electric pump wellhead device is a very common artificial lift oil production equipment. When there is not enough pressure at the bottom of the well to push the crude oil to form a self-flowing, it is necessary to put the electric submersible pump into the oil layer to work. The electric energy of the electric submersible pump is usually supplied by cables. When connecting the cables, they need to pass through the electric pump wellhead device. Passing through the wellhead device must be done with the help of a cable crosser to ensure the pressure bearing and sealing of the cable during the crossing process.

[0003] Cable crossings can be divided into wellhead cable crossings and downhole cable crossings according to their different locations of use. Wellhead cable crossings are mainly used to penetrate the tubing hanger and upper flange, and connect the downhole cable with the ground cable; downhole cable crossings are located at the downhole packer and are used to connect downhole cables with downhole cables. Downhole cable crossings are located underground in a harsh working environment, and require high sealing and insulation performance. At the same time, during the working process, the cable crossings need to be quickly installed and fixed to avoid unnecessary risks.

[0004] However, in the prior art, there is still room for improvement in the sealing, insulation and installation of the downhole cable transit device, and the quality of the downhole cable transit device can be further improved to meet the market demand. Summary of the invention

[0005] In order to overcome the shortcomings of the existing downhole cable penetration device, such as poor sealing and insulation performance and slow installation speed, the utility model proposes a downhole single-plug cable penetration device, and its detailed technical solution is as follows:

[0006] A downhole single-plug cable transit device comprises a straight plug and a transit device body detachably connected to the straight plug, wherein the transit device body comprises a first shell with external threads and a first insulating conductive rod fixed in the first shell and protruding outward; the straight plug comprises a second insulating conductive rod, a front joint connected to the second insulating conductive rod, and a connecting screw cover located outside the front joint and with internal threads; the first insulating conductive rod can be inserted into the front joint to connect the first insulating conductive rod and the second insulating conductive rod circuit, and the first shell is threadedly connected to the connecting screw cover.

[0007] Furthermore, the body of the device is a long hollow cylindrical structure, including a first shell with external threads at both ends, a second shell fixedly connected to one end of the first shell, and an adapter that is sleeved on the outside of the second shell and threadedly connected to the first shell.

[0008] Furthermore, a cylindrical connecting sleeve is provided on the outer surface of the first shell; the adapter is snap-connected with the connecting sleeve and is threadedly connected with the first shell.

[0009] Furthermore, a first insulating conductive rod connected to a three-phase cable is provided inside the body of the transmitter; a sealing layer is provided between the three-phase cable and the adapter, an epoxy resin layer is provided between the three-phase cable and the second shell, the first insulating conductive rod and the second shell, and an insulating layer is provided between the first insulating conductive rod and the first shell.

[0010] Furthermore, the sealing layer is a chloroprene rubber layer, and the insulating layer is an ethylene-propylene rubber layer.

[0011] Furthermore, the straight plug includes a front joint, a connecting nut cover with an internal thread, a front joint shell, an upper tail shell and a ferrule-type pipe joint; the front joint is threadedly connected to the front joint shell and protrudes from one end of the front joint shell, and the connecting nut cover is fixedly connected to the front joint shell; the upper tail shell is sleeved and fixed on the outer surface of the front joint shell, and one end is connected to the ferrule-type pipe joint.

[0012] Furthermore, an elastic electrode ring and a conductive tube connected to the elastic electrode ring are arranged inside the front joint; a second insulating conductive rod connected to the conductive tube is arranged inside the front joint shell, and the other end of the second insulating conductive rod is connected to a three-phase cable.

[0013] Furthermore, the straight plug is provided with a hydrogenated nitrile rubber layer between the ferrule pipe joint and the three-phase cable, and an epoxy resin layer is provided between the front joint shell and the second insulating conductive rod, and between the front joint shell and the three-phase cable.

[0014] The utility model has the following beneficial effects: the utility model provides a downhole single-plug cable passer, which can realize the fast installation of the straight plug and the passer body through the snap-fit ​​threaded connection between the straight plug and the cable passer body. In terms of specific structure, the first insulating conductive rod and the front joint are used to realize fast positioning, and the first shell and the connection screw cover are used to realize the stability of the structural connection through the threaded matching connection.

[0015] In terms of insulation and sealing performance, a chloroprene rubber sealing layer, an epoxy resin layer and an EPDM rubber layer are arranged in sequence on the main body of the penetrater according to the direction in which the cable passes through; an EPDM rubber layer and an epoxy resin layer are arranged in the straight plug to ensure the insulation and sealing of the mechanism respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of an underground single-plug cable penetrator.

[0017] Figure 2 It is an exploded view of the shell of the main body of the utility model crosser.

[0018] Figure 3 It is a cross-sectional view of the main body of the utility model crosser.

[0019] Figure 4 It is an exploded view of the shell of the straight plug of the utility model.

[0020] Figure 5 It is a cross-sectional view of the straight plug of the utility model.

[0021] in:

[0022] 100—transmitter body; 200—straight plug;

[0023] 110—first housing; 120—second housing; 130—adapter; 140—first insulating conductive rod;

[0024] 150—insulating layer; 160—epoxy resin layer; 170—sealing layer;

[0025] 111—connecting sleeve;

[0026] 210—front connector; 220—connecting screw cap; 230—front connector housing; 240—upper tail housing;

[0027] 250—Compression fittings;

[0028] 211—elastic electrode ring; 212—conductive tube; 213—second insulating conductive rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] A single-plug cable pass-through device for underground wells, the structure of which is as follows Figure 1 As shown, the piercing device body 100 and the straight plug 200 are detachably connected, and the piercing device body 100 and the straight plug 200 are threadedly connected. Figure 1 In the figure, a downhole cable is inserted into the lower end of the transit body 100, and the upper end is connected to the straight plug 200; another section of downhole cable is inserted into the upper end of the straight plug 200, and the connection between the straight plug 200 and the transit body 100 is realized internally.

[0031] The main body 100 of the device includes a shell, the structure of which is as follows: Figure 1 and Figure 2 As shown, it is a long hollow cylindrical structure, including a first shell 110, a second shell 120 fixedly connected to one end of the first shell 110, and an adapter 130 that is sleeved on the outside of the second shell 120 and threadedly connected to the first shell 110. The first shell 110 is provided with external threads at both ends, and a cylindrical connecting sleeve 111 is fixedly provided on the outer surface; one end of the adapter 130 is provided with an external thread for connecting with other external components, and the inner surface is provided with an internal thread matching the external thread of the first shell 110, and the other end of the adapter 130 is snapped into the connecting sleeve 111, so that the outer surface of the adapter 130 is flush with the outer surface of the connecting sleeve 111 and is threadedly connected to the first shell 110 through the internal thread. The length of the adapter 130 is greater than the length of the second shell 120. The internal structure of the traverser body 100 is shown in FIG. Figure 3 As shown, three parallel and non-collinear first insulating conductive rods 140 are also arranged inside the main body 100 of the through-device. The three-phase cable is inserted from the end of the adapter 130 away from the first shell 110, and the exposed cable head is inserted into the first insulating conductive rod 140 in the first shell 110, thus completing the connection between the three-phase cable and the main body of the through-device. In order to ensure the insulation and sealing of the main body 100 of the through-device, the outer surface of the three-phase cable and the inner surface of the adapter 130 are filled with a sealing layer 170, and the sealing layer 170 is chloroprene rubber; between the three-phase cable and the second shell 120, and between the first insulating conductive rod 140 and the second shell 120, an epoxy resin layer 160 is filled; between the first insulating conductive rod 140 and the first shell 110, an insulating layer 150 is arranged, and the insulating layer is an ethylene-propylene rubber layer.

[0032] The structure of the straight plug 200 is as follows: Figure 1 and Figure 4 As shown, it includes a front joint 210, a connecting screw cap 220 with internal threads, a front joint housing 230, an upper tail housing 240 and a ferrule-type pipe joint 250. The front joint 210 is threadedly connected to the front joint housing 230 and protrudes from one end of the front joint housing 230. The connecting screw cap 220 is fixed to one end of the front joint housing 230 close to the front joint 210 and there is a gap between the front joint 210 and the upper tail housing 240. The upper tail housing 240 is fitted and fixed to the outer surface of the front joint housing 230, one end of which is adjacent to the connecting screw cap 220 and the other end is connected to the ferrule-type pipe joint 250. The internal structure of the straight plug 200 is shown in FIG. Figure 5As shown, the front connector 210 is provided with an elastic electrode ring 211 and a conductive cylinder 212 connected to the elastic electrode ring 211; the front connector housing 230 is provided with a second insulating conductive rod 213 connected to the conductive cylinder 212, and the other end of the second insulating conductive rod 213 is connected to the single-phase cable. The straight plug 200 is filled with a sealing layer 170 between the ferrule-type pipe joint 250 and the three-phase cable, and the sealing layer 170 is made of hydrogenated nitrile rubber; the straight connector 200 is filled with an epoxy resin layer 160 between the front connector housing 230 and the second insulating conductive rod 213, and between the front connector housing 230 and the three-phase cable.

[0033] In the present invention, the connection between the two sections of three-phase cables is achieved by connecting the three-phase cable to the first insulating conductive rod 140 in the traversing device body 100, connecting the three-phase cable to the second insulating conductive rod 213 in the straight plug 200, and then inserting the first insulating conductive rod 140 into the elastic electrode ring 211 of the straight plug 200. During the structural assembly process, the exposed first insulating conductive rod 140 and the front connector 210 are used to achieve rapid positioning, and the external thread provided on the first housing 110 matches the internal thread of the connecting screw cover 220 to achieve rapid connection between the traversing device body 100 and the straight plug 200.

[0034] In terms of sealing and insulating performance, a chloroprene rubber sealing layer, an epoxy resin layer and an ethylene propylene rubber layer are sequentially arranged on the penetration body 100 according to the cable passing direction; an ethylene propylene rubber layer and an epoxy resin layer are arranged in the straight plug 200.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A downhole single-plug cable passer, comprising a straight plug and a passer body detachably connected to the straight plug, characterized in that: The main body of the transmitter includes a first shell with an external thread and a first insulating conductive rod fixed in the first shell and protruding outward; the straight plug includes a second insulating conductive rod, a front joint connected to the second insulating conductive rod, and a connecting screw cover located on the outside of the front joint and with an internal thread; the first insulating conductive rod can be inserted into the front joint to connect the first insulating conductive rod and the second insulating conductive rod circuit, and to enable the first shell to be threadedly connected to the connecting screw cover.

2. The underground single-plug cable pass-through device according to claim 1, characterized in that: The main body of the device is a long hollow cylindrical structure, including a first shell with external threads at both ends, a second shell fixedly connected to one end of the first shell, and an adapter that is sleeved on the outside of the second shell and threadedly connected to the first shell.

3. The downhole single-plug cable pass-through device according to claim 2, characterized in that: A cylindrical connecting sleeve is arranged on the outer surface of the first shell; the adapter is snap-connected with the connecting sleeve and is threadedly connected with the first shell.

4. The underground single-plug cable pass-through device according to claim 3 is characterized in that: A first insulating conductive rod connected to a three-phase cable is arranged inside the body of the transmitter; a sealing layer is arranged between the three-phase cable and the adapter, an epoxy resin layer is arranged between the three-phase cable and the second shell, the first insulating conductive rod and the second shell, and an insulating layer is arranged between the first insulating conductive rod and the first shell.

5. The downhole single-plug cable pass-through device according to claim 4, characterized in that: The sealing layer is a chloroprene rubber layer, and the insulating layer is an ethylene-propylene rubber layer.

6. The underground single-plug cable pass-through device according to claim 1, characterized in that: The straight plug comprises a front joint, a connecting nut cover with internal threads, a front joint shell, an upper tail shell and a ferrule-type pipe joint; the front joint is threadedly connected to the front joint shell and protrudes from one end of the front joint shell, and the connecting nut cover is fixedly connected to the front joint shell; the upper tail shell is sleeved and fixed on the outer surface of the front joint shell, and one end is connected to the ferrule-type pipe joint.

7. The downhole single-plug cable pass-through device according to claim 6, characterized in that: An elastic electrode ring and a conductive cylinder connected to the elastic electrode ring are arranged inside the front joint; a second insulating conductive rod connected to the conductive cylinder is arranged inside the front joint shell, and the other end of the second insulating conductive rod is connected to a three-phase cable.

8. The downhole single-plug cable pass-through device according to claim 7, characterized in that: The straight plug is provided with a hydrogenated nitrile rubber layer between the ferrule pipe joint and the three-phase cable, and an epoxy resin layer is provided between the front joint shell and the second insulating conductive rod, and between the front joint shell and the three-phase cable.

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