CN102545135A - Cable sealing joint special for oil well - Google Patents

Abstract

The utility model relates to a special cable sealing joint for oil wells, which relates to a special high-pressure-resistant single-core cable sealing joint for oil wells. The present invention solves the problem that the existing cable joints cannot be well sealed, resulting in cable leakage under 30MPa high pressure, resulting in short circuit of equipment and great loss to production. The two sealing bodies of the present invention are symmetrically installed at both ends of the wire barrel, each sealing body and the wire barrel are sealed by an O-shaped sealing ring, and each sealing body and the wire barrel are connected by threads, and each sealing body At the center of the wire barrel, there are connected cable chambers, sealing chambers and nut installation chambers from one end of the wire barrel to the outer end. Several special-shaped gaskets are installed in each sealing chamber, and a compression nut is installed in each nut installation chamber. The compression nut is threadedly connected with the sealing main body, and the end face of each special-shaped sealing gasket is a convex-concave surface. The invention is used for connecting two sections of armored cables.

Description

Special cable gland for oil well

technical field

The invention relates to a high-pressure-resistant single-core cable sealing joint specially used for oil wells.

Background technique

At present, when connecting downhole equipment in oil fields, two sections of cables need to be connected between two different equipment; however, most of the existing cable joints are sealed with O-rings, and the sealing effect of this sealing method is not very good. Leakage sometimes occurs under the high pressure of 30MPa, causing a short circuit of the equipment and causing great losses to production. Although some cable joints can be reliably sealed, there are problems such as inconvenient operation and difficult disassembly.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing cable joints cannot be well sealed, resulting in leakage of the cable under 30MPa high pressure, causing short circuit of the equipment and bringing great losses to production, and to provide a special oil well special Cable glands.

The technical scheme that the present invention takes for solving the above problems is:

A special cable sealing joint for oil wells. The cable sealing joint includes a junction barrel, two sealing bodies, two compression nuts, several O-shaped sealing rubber rings and several special-shaped sealing gaskets. The two sealing bodies are symmetrically installed on the wiring The two ends of the barrel, each sealing body and the wiring barrel are sealed by O-rings, and each sealing body and the wiring barrel are connected by threads, and the center of each sealing body is set from one end of the wiring barrel to the outer end. There are connected cable chambers, sealing chambers and nut installation chambers. Several special-shaped gaskets are installed in each sealing chamber, and a compression nut is installed in each nut installation chamber, and the compression nut is threadedly connected with the sealing body. The shape of the end face of the special-shaped gasket is a convex-concave surface.

The beneficial effects of the present invention are: one, because the end face shape of the special-shaped gasket 2 of the present invention is a convex-concave curved surface, the special-shaped gasket 2 is deformed under the extrusion action of the compression nut 4, and the armored cable 6 is locked, thereby The reliable sealing of the joint of the armored cable 6 is ensured; the present invention can ensure that the cable does not leak under the high pressure of 30MPa, avoids the short circuit of the equipment, and reduces the potential safety hazard. 2. The present invention is small in volume, reliable in sealing, convenient in operation and easy in disassembly.

Description of drawings

FIG. 1 is a front sectional view of the overall structure of the present invention, and FIG. 2 is a front view of a special-shaped gasket 2 .

Detailed ways

Specific embodiment 1: This embodiment is described in conjunction with Fig. 1 and Fig. 2. The special cable sealing joint for oil wells in this embodiment includes a connection barrel 1, two sealing main bodies 3, two compression nuts 4, a An O-shaped sealing rubber ring 5 and several special-shaped sealing gaskets 2, two sealing bodies 3 are symmetrically installed at both ends of the wiring barrel 1, and each sealing body 3 and the wiring barrel 1 are sealed by an O-shaped sealing ring 5, and Each sealing body 3 is threadedly connected to the wiring barrel 1, and the center of each sealing body 3 is provided with a cable cavity 3-1, a sealing cavity 3-2 and a nut installation cavity connected from one end of the wiring barrel 1 to the outer end. 3-3, several special-shaped sealing gaskets 2 are housed in each sealing cavity 3-2, and a compression nut 4 is housed in each nut installation cavity 3-3, and the compression nut 4 is threadedly connected with the sealing main body 3, each The end face shape of each special-shaped gasket 2 is a convex-concave curved surface. The joints of the two sections of armored cables 6 are sealed in the junction barrel 1, and the surroundings of the armored cables 6 are sealed by special-shaped gaskets 2. When the cables are connected, first install the compression nut 4 at one end, the special-shaped gasket 2 and the sealing body 3 on one of the armored cables 6, and then tighten the compression nut 4 to realize the sealing of the armored cable 6; Install the compression nut 4 at the other end, the special-shaped gasket 2, the sealing body 3 and the wiring barrel 1 on another armored cable 6, and the compression nut 4 will not be tightened temporarily; after the wiring of the two sections of cables is completed, first Tighten the threaded connection between the wire barrel 1 and the sealing body 3, and finally tighten the compression nut 4 at the other end, that is, the connection of the two sections of armored cables 6 is completed.

Embodiment 2: This embodiment is described with reference to FIG. 1 . In this embodiment, there are at least two O-rings 5 between each sealing body 3 and the wire barrel 1 . This design makes the O-shaped seal between the sealing body 3 and the wire barrel 1 better. Other compositions and connections are the same as in the first embodiment.

Embodiment 3: This embodiment is described with reference to FIG. 2 . The material of each special-shaped gasket 2 in this embodiment is polytetrafluoroethylene. This design can make the entire cable joint easy to disassemble and use for many times. Other compositions and connections are the same as in the first embodiment.

Claims (3)

1. oil well private cable seal nipple; Said cable sealed joint comprises wiring tube (1), two sealed bodies (3), two clamp nuts (4), several O type sealing rubber rings (5) and several profiled seal pads (2); Two sealed bodies (3) symmetry is installed in the two ends of wiring tube (1); Lean on O RunddichtringO (5) sealing between each sealed body (3) and the wiring tube (1); And adopt between each sealed body (3) and the wiring tube (1) to be threaded, it is characterized in that: said cable sealed joint also comprises several profiled seal pads (2), and the center of each sealed body (3) is provided with cable chamber (3-1), annular seal space (3-2) and the nut installation cavity (3-3) that communicates by wiring tube (1) one end to outer end; Several profiled seal pads (2) are housed in each annular seal space (3-2); In each nut installation cavity (3-3) clamp nut (4) is housed, and clamp nut (4) is threaded with sealed body (3), the end surface shape of each profiled seal pad (2) is a concave and convex surface.

2. according to the said oil well private cable of claim 1 seal nipple, it is characterized in that: the quantity of the O RunddichtringO (5) between each sealed body (3) and the wiring tube (1) is provided with two at least.

3. according to claim 1 or 2 said oil well private cable seal nipples, it is characterized in that: the material of each profiled seal pad (2) is a polytetrafluoroethylene.

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