CN109861162B - Underground cable high-temperature high-pressure sealing joint for oil shale - Google Patents

Abstract

The underground cable high-temperature high-pressure sealing joint for the oil shale comprises a soft sealing structure and a hard sealing structure, wherein the soft sealing structure comprises a soft sealing main body, a soft cable, a first gland, a first gasket, a rubber ball and a first airtight detection hole; the hard sealing structure comprises a hard sealing main body, a hard cable, a second gland, a second gasket, a hard sealing gasket and a second air tightness detection hole. The sealing device is suitable for sealing soft and hard cable joints in high-temperature, high-pressure and humid environments, and can effectively prevent the problem that the soft and hard cable sealing joints fail in high-temperature, high-pressure and high-tide environments. The structure is simple.

Description

A high-temperature and high-pressure sealing joint for downhole cables used in oil shale

Technical field

The invention relates to a high-temperature and high-pressure sealing joint for downhole cables used in oil shale, and in particular to a cable sealing joint used in high-temperature, high-pressure, and high-humidity environments.

Background technique

Downhole electric heaters are key equipment for downhole heat injection technology for in-situ cracking of oil shale. The working environment of downhole electric heaters in oil shale heat injection wells is complex working conditions such as high temperature, high pressure, and high humidity. Therefore, downhole electric heaters The power line sealing problem is a key technical link in downhole heat injection technology. Currently commonly used sealing methods include a leak-proof cable wiring sealing device (CN101232217) proposed by Zhejiang Dayuan Pump Industry Co., Ltd. This patent can achieve sealing problems in humid environments at normal temperatures and pressures, but is not suitable for high temperatures, high pressures, and high temperatures. Wet environment; China Yangtze Electric Power Co., Ltd. proposed an underwater cable sealing junction box (CN205092559U). This method realizes the sealing problem of underwater cable joints, but is not suitable for high temperature, high pressure, and high humidity environments. In order to solve the problems of difficult cable sealing and frequent failures in the high-temperature, high-pressure and humid environment of oil shale heat injection wells, a high-temperature and high-pressure sealing joint for downhole cables in oil shale is proposed to seal soft and hard cables in high-temperature and high-pressure environments. The modification was carried out to completely eliminate the problems with cable wiring.

Contents of the invention

The invention provides a high-temperature and high-pressure sealing joint for downhole cables used in oil shale, which is suitable for sealing joints of soft and hard cables in high-temperature, high-pressure, and humid environments, and can effectively prevent sealing joints of soft and hard cables in high-temperature, high-pressure, and high-tide environments. Failure problem.

A high-temperature and high-pressure sealing joint for downhole cables used in oil shale, consisting of a soft sealing structure and a hard sealing structure;

The soft sealing structure includes a soft sealing body, a soft cable, a first gland, a first gasket, a rubber ball and a first air tightness detection hole; an internal thread is provided on the upper part of the soft sealing body, and the internal thread is connected to the first gland. It is used to compress the first gasket; there is a spherical groove in the middle of the soft sealing body, which is used to limit the position of the rubber ball so that the rubber ball presses the soft cable and is close to the inner wall of the soft sealing body. The first gasket has a through hole; The lower part of the first gasket is provided with a spherical groove for compressing the rubber ball; the lower part of the soft seal body is provided with a first air tightness detection hole for detecting the air tightness of the soft seal.

The flexible cable is composed of copper bundles and rubber;

The hard sealing structure includes a hard sealing body, a hard cable, a second gland, a second gasket, a hard sealing pad and a second air tightness detection hole.

The upper part of the hard seal body is provided with internal threads, which are used to connect with the second gland and compress the second gasket; the hard seal body is provided with a step in the middle, and several sealing grooves are provided on the surface of the step, and the several sealing grooves are connected with the hard seal The gasket matches and plays a sealing role; the lower part of the hard seal body is provided with a second air tightness detection hole for testing the air tightness of the hard connection;

Hard cables are composed of copper core, insulation layer and copper skin;

The soft sealing body and the hard sealing body are welded together; the copper skin of the hard cable and the hard sealing pad are welded together; the copper core of the hard cable and the copper bundle of the soft cable are connected with copper tubes, and the rubber skin, copper tube, and hard cable of the soft cable are connected Apply a layer of sealant to the outside of the copper skin.

A high-temperature and high-pressure sealing joint for downhole cables used in oil shale. The sealing steps for a single flexible cable are as follows:

Step 1: Pass the soft sealing body, soft cable, first gland, first gasket and rubber ball through the soft cable respectively;

Step 2: Weld the soft sealing body at the location that needs to be sealed;

Step 3: Tighten the first gland;

Step 4: Inject high-pressure air into the first air tightness detection hole to detect the air tightness of the soft seal

Step 5: Seal the first air tightness detection hole.

The steps for sealing a single hard cable are as follows:

Step 1: Pass the hard sealing body, hard cable, second gland, second gasket, and hard sealing gasket through the hard cable respectively;

Step 2: Weld the hard sealing gasket and the copper on the outside of the hard cable together;

Step 3: Weld the hard seal body at the location that needs to be sealed;

Step 4: Tighten the second gland;

Step 5: Inject high-pressure air into the second air tightness detection hole to detect the air tightness of the hard seal;

Step 6: Seal the second air tightness detection hole.

The steps for sealing the connection between hard cables and soft cables are as follows:

Step 1: Pass the soft sealing body, soft cable, first gland, first gasket and rubber ball through the soft cable respectively; pass the hard sealing body, hard cable, second gland, second gasket and hard sealing gasket through the hard sealing gasket respectively. cable, which welds the soft sealing body and the hard sealing body together;

Step 2: Weld the copper sheath of the hard cable and the hard sealing gasket together;

Step 3: First connect the copper core of the hard cable and the copper bundle of the soft cable with a copper tube, then apply a layer of 504 sealant on the outside of the rubber sheath, copper tube and copper sheath of the hard cable;

Step 4: First seal one side of the hard cable, press the second gland, and then press the first gland;

Step 5: Inject high-pressure air into the first air tightness detection hole or the second air tightness detection hole to detect the sealing of the joint;

Step 6: Seal the first air tightness detection hole and the second air tightness detection hole.

Beneficial effects of the present invention:

It is suitable for sealing joints of soft and hard cables in high temperature, high pressure and humid environments, and can effectively prevent the failure of sealing joints of soft and hard cables in high temperature, high pressure and high tide environments.

Description of the drawings

Figure 1 is a schematic diagram of the high temperature and high pressure sealing joint of the flexible cable of the present invention.

Figure 2 is a schematic diagram of the high temperature and high pressure sealing joint of the hard cable of the present invention.

Figure 3 is a schematic diagram of a high-temperature and high-pressure sealing joint for connecting soft cables and hard cables according to the present invention.

In the picture: 1-soft seal body, 201-rubber, 202-copper bundle, 3-first gland, 4-first gasket, 5-rubber ball, 6-first air tightness detection hole, 7-hard seal Main body, 801-copper skin, 802-insulation layer, 803-copper core, 9-second gland, 10-second gasket, 11-hard sealing gasket, 12-second air tightness detection hole, 13-copper tube .

Detailed ways

Please refer to Figure 1, Figure 2 and Figure 3. A high temperature and high pressure sealing joint for downhole cables used in oil shale consists of a soft sealing structure and a hard sealing structure;

The soft sealing structure includes a soft sealing body 1, a soft cable, a first gland 3, a first gasket 4, a rubber ball 5 and a first air tightness detection hole 6; the upper part of the soft sealing body 1 is provided with internal threads, and the internal threads are connected to The first gland 3 is connected and used to compress the first gasket 4; the soft seal body 1 is provided with a spherical groove in the middle to limit the position of the rubber ball 5 so that the rubber ball 5 presses the soft cable and is close to the soft seal. On the inner wall of the main body 1, the first gasket 4 is provided with a through hole; the lower part of the first gasket 4 is provided with a spherical groove for compressing the rubber ball 5; the lower part of the soft sealing main body 1 is provided with a first air tightness detection hole 6 for Test the air tightness of the soft seal.

The flexible cable is composed of copper bundle 202 and rubber 201;

The hard seal structure includes a hard seal body 7 , a hard cable, a second gland 9 , a second gasket 10 , a hard seal 11 and a second air tightness detection hole 12 .

The upper part of the hard sealing body 7 is provided with internal threads, which are used to connect with the second gland 9 and compress the second gasket 10; the hard sealing body 7 is provided with a step in the middle, and several sealing grooves are provided on the surface of the step. The groove cooperates with the hard sealing gasket 11 to play a sealing role; the lower part of the hard sealing body 7 is provided with a second air tightness detection hole 12 for testing the air tightness of the hard connection;

The hard cable is composed of copper core 803, insulation layer 802 and copper skin 801;

The soft sealing body 1 and the hard sealing body 7 are welded together; the copper skin 801 of the hard cable and the hard sealing pad 11 are welded together; the copper core 803 of the hard cable and the copper bundle 202 of the soft cable are connected with a copper tube 13, and the Apply a layer of 504 sealant on the outside of the rubber 201, copper tube 13, and copper 801 of the hard cable.

A high-temperature and high-pressure sealing joint for downhole cables used in oil shale. The sealing steps for a single flexible cable are as follows:

Step 1: Pass the soft sealing body 1, the soft cable, the first gland 3, the first gasket 4 and the rubber ball 5 through the soft cable respectively, as shown in Figure 1;

Step 2: Weld the soft sealing body 1 at the location that needs to be sealed;

Step 3: Tighten the first gland 3;

Step 4: Inject high-pressure air into the first air tightness detection hole 6 to detect the air tightness of the soft seal. Step 5: Seal the first air tightness detection hole 6 .

The steps for sealing a single hard cable are as follows:

Step 1: Pass the hard sealing body 7, the hard cable, the second gland 9, the second gasket 10, and the hard sealing gasket 11 through the hard cable respectively, as shown in Figure 2;

Step 2: Weld the hard sealing gasket 11 and the copper sheet 801 on the outside of the hard cable together;

Step 3: Weld the hard sealing body 7 at the location that needs to be sealed;

Step 4: Tighten the second gland 9;

Step 5: Inject high-pressure air into the second air tightness detection hole 12 to detect the air tightness of the hard seal;

Step 6: Seal the second air tightness detection hole 12.

The steps for sealing the connection between hard cables and soft cables are as follows:

Step 1: As shown in Figure 3, pass the soft sealing body 1, the soft cable, the first gland 3, the first gasket 4 and the rubber ball 5 through the soft cable respectively; the hard sealing body 7, the hard cable, the second gland 9. The second gasket 10 and the hard sealing gasket 11 pass through the hard cable respectively, and the soft sealing body 1 and the hard sealing body 7 are welded together;

Step 2: Weld the copper sheath 801 of the hard cable and the hard sealing gasket 11 together;

Step 3: First connect the copper core 803 of the hard cable and the copper bundle 202 of the soft cable with a copper tube 13, and then apply a layer of 504 sealant on the outside of the rubber sheath 201, copper tube 13, and copper sheath 801 of the hard cable;

Step 4: First seal one side of the hard cable, press the second gland 9, and then press the first gland 3;

Step 5: Inject high-pressure air into the first air tightness detection hole 6 or the second air tightness detection hole 12 to detect the tightness of the joint;

Step 6: Seal the first air tightness detection hole 6 and the second air tightness detection hole 12.

Claims (1)

1. The utility model provides an oil shale is with cable high temperature high pressure seal joint in pit which characterized in that: consists of a soft sealing structure and a hard sealing structure;

the soft sealing structure comprises a soft sealing main body (1), a soft cable, a first gland (3), a first gasket (4), a rubber ball (5) and a first air tightness detection hole (6); the upper part of the soft sealing main body (1) is provided with an internal thread which is connected with the first gland (3) and used for compressing the first gasket (4); the middle part of the soft sealing main body (1) is provided with a spherical groove for limiting the position of the rubber ball (5), so that the rubber ball (5) presses the soft cable tightly and clings to the inner wall of the soft sealing main body (1), and the first gasket (4) is provided with a through hole; the lower part of the first gasket (4) is provided with a spherical groove for compacting the rubber ball (5); the lower part of the soft sealing main body (1) is provided with a first air tightness detection hole (6) for detecting the air tightness of the soft sealing;

the flexible cable consists of copper bundles (202) and rubber sheets (201);

the hard sealing structure comprises a hard sealing main body (7), a hard cable, a second gland (9), a second gasket (10), a hard sealing gasket (11) and a second air tightness detection hole (12);

the upper part of the hard sealing main body (7) is provided with an internal thread which is used for being connected with a second gland (9) to compress a second gasket (10); a step is arranged in the middle of the hard sealing main body (7), a plurality of sealing grooves are arranged on the surface of the step, and the plurality of sealing grooves are matched with the hard sealing gasket (11) to play a sealing role; the lower part of the hard sealing main body (7) is provided with a second air tightness detection hole (12) for detecting the air tightness of the hard connection;

the hard cable consists of a copper core (803), an insulating layer (802) and a copper sheet (801);

the soft sealing main body (1) and the hard sealing main body (7) are welded together; the copper sheet (801) of the hard cable and the hard sealing gasket (11) are welded together; the copper core (803) of the hard cable and the copper bundle (202) of the soft cable are connected by the copper pipe (13), and the rubber (201) of the soft cable, the copper pipe (13) and the outer side of the copper sheet (801) of the hard cable are coated with a layer of 504 sealant.