RU2280755C2 - Combined cable entry - Google Patents

Abstract

FIELD: oil industry, particularly to connect electric submersible pump cable with land-based station without plugs and sockets.

SUBSTANCE: cable entry comprises body, sealing means to provide insulated cable cords air-tightness, gasket and collar. Above components have inner channels corresponding to armored cable dimension. Pipe provided with lower channel, central cylindrical channel and upper conical cavity is installed over the channels. Lower channel has dimensions equal to armored cable dimension. The sealing means is provided with support and pressure gaskets and is arranged in conical pipe cavity. Cable entry also comprises nut arranged on outer body surface and flanged box connected with nut by means of pins.

EFFECT: increased safety and extended application range.

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Description

The invention relates to the oil industry and can be used for one-piece connection of the cable of an electric submersible pump with a ground station.

It is known a one-piece connection of an electric submersible pump with a ground station. In the faceplate of the fountain fittings installed at the wellhead, there is a cable entry [1]. In the cable entry area, the armor is removed from the cable. A split support pad, cuff, pressure pad is put on the cores in insulation. All this is embedded in the housing and is clamped with a nut through the sleeve. Cable entry provides tightness at a pressure of 21 MPa.

However, with this cable entry design, a cable with conductors without armor is in the well. During the operation of valves are possible:

- mechanical damage to the insulation of conductors during tripping;

- destruction of the core insulation by the well medium;

- decompression destruction of core insulation;

- twisting of veins when tightening the nut.

Known plug connection of an electric submersible pump with a ground station - the electrical system of the company "FMC" [2]. The bottom of the connector is sealed to the hole in the faceplate. The cable of the lower part of the connector is spliced with the cable coming from the electric submersible pump. Collect fountain fittings. Splices the top of the connector with a cable going to the ground station. Using a threaded nut, connect the upper and lower parts of the connector. The connector provides electrical and hydraulic safety for the connections.

However, it is difficult to manufacture and specially assembled electricians are required to assemble the connector and splice the cable. Splicing a cable in a well is a very laborious process.

Known selected as the closest analogue cable entry design [3]. In the area of the cable entry, the cable is removed from the cable, the wires covered with insulation are put on a seal and put it into the body welded to the faceplate. A flanged packing follower is put on the cable, which clamps the seal with studs and nuts. Cable entry provides tightness at a pressure of 14 MPa.

However, with this design of the cable entry, the disadvantages of the previous design remain, except for the absence of damage to the wires from twisting

The technical result of the invention is the ability to install an electrically and hydraulically safe combined cable entry on all types of fountain fittings.

The specified technical result is achieved by the fact that on the cable in the armor, passed through the cable entry housing, put on a gasket, cuff and put into the housing. Then, the armor is removed from the cable above the end of the case at a certain length. A nut with studs is screwed onto the body. The trunk is put on the cable, which enters the casing with the lower end and presses the cuff, the wires are laid out in isolation and successively install the support gasket, seal, pressure gasket and put them in the conical cavity of the top of the trunk, the flange chest box is put on the cable, it is installed on the barrel and studs tighten with nuts.

The combination of these features ensures the achievement of the goal. The presence of a cuff sealing the cable on the armor protects the cores in isolation from the effects of the well environment, reduces the likelihood of decompression destruction of the cores insulation, eliminates mechanical damage to the cores insulation during tripping.

Installing a seal on the conductors in isolation and clamping it with a flange packing follower ensure high tightness of the cable entry and damage to the conductors from twisting is eliminated.

The drawing shows a General view of the proposed combined cable entry.

The combined cable entry includes a housing 1 with a gasket 2 and a sleeve 3 in the inner cavity, having channels 4 by the size of the cable in the armor, on the outer surface a nut 5 with studs 6; a barrel 7 having a channel 8 in the lower part according to the cable dimensions in the armor, in the middle part a cylindrical channel 9, in the upper part a conical cavity 10 with a support gasket 11, a seal 12, a pressure gasket 13, a flange chest box 14 with nuts 15 is put on the studs 6 .

The combined cable entry is assembled as follows:

Housing 1 is sealed in the faceplate. The cable passes through the hole in the housing 1. A gasket 2 and a sleeve 3, having channels 4 by the size of the cable, are put on the cable in the armor, they fit into the internal cavity of the housing 1, the armor is removed from the cable at a certain length. A nut 5 with studs 6 is put on the cable and screwed onto the housing 1. The trunk 7, having a channel 8 in the lower part of the cable in the armor in the middle part, a cylindrical channel 9 in the middle part, a conical cavity 10 in the upper part, is put on the cable and presses with the lower end cuff 3. A support gasket 11, a seal 12, a pressure gasket 13 are sequentially put on the cores in insulation, and all this is inserted into the conical cavity 10 of the barrel 7, lastly on the cable, and then on the studs 6 the flanged packing follower 14 is put on and tightened with nuts 15.

The proposed design of the combined cable entry ensures tightness of the conductors in insulation with a seal 12, the presence of a flange packing follower 14 eliminates damage to the cores from twisting. The sleeve 3, which seals the cable along the armor, does not allow the borehole medium to enter the cable conductors and reduces the likelihood of decompression destruction of the insulation of the conductors. The absence of veins without armor in the well eliminates their damage during tripping.

The proposed combined cable entry can be manufactured and mounted on the faceplate of the fountain fittings by the same means as the known cable entries. This, together with a positive effect, indicates the industrial suitability of the invention.

The source of information

1. Cable entry AFK 210SU.300 SB.

2. General catalog of wellhead equipment for 1996-1997, "FMC".

3. Copyright certificate SU 1640360, 1991.

Claims (1)

A combined cable entry comprising a housing, a seal providing cable tightness over the conductors in insulation, characterized in that the housing is provided with a gasket and sleeve, the internal channels of which correspond to the size of the cable in the armor, the trunk installed on them, having a channel at the bottom for cable dimensions in the armor, in the middle part there is a cylindrical channel, and at the top there is a conical cavity, the seal is made with support and pressure gaskets and placed in the conical cavity of the barrel, and the cable entry is equipped with an outer surface and the housing with a nut and a flange packing follower connected by means of studs with a nut.