RU148534U1 - PIPE HEAD HOUSING CONTAINING A SEALED CABLE INPUT - Google Patents

Abstract

1. The cylindrical housing of the tube head containing an axial channel, openings with side bends communicating with the axial channel, connecting flanges, characterized in that it further comprises a hole in the lateral surface of the cylindrical housing for withdrawing at least one cable from the well and hermetically a closing hole mounted on the side surface of the cylindrical body for withdrawing at least one cable from the well a cable entry made in the form of a flange having at least measures e, one hole for the cable, inside of which are installed elements that provide sealing and fixation of the cable. 2. A cylindrical housing according to claim 1, characterized in that the elements providing for sealing and fixing the cable are installed inside at least one cable hole to the left and right of the axis of the cable hole. 3. The cylindrical housing according to claim 1, characterized in that the elements that provide sealing and fixing of the cable are hollow bolts, pressure conical washers, gaskets with holes for the cable, conical washers.

Description

The utility model relates to the oil and gas industry, to wellhead equipment for oil and gas wells, namely to the constituent elements of the pipe heads, which are part of the piping, and can be used to seal at least one cable at the wellhead.

When operating wells, use power, electrical, electro-optical cables that provide power to electric motors of submersible oil pumps; cables and distributed fiber optic sensor cables for geophysical surveys. Due to the presence of high pressure in the well, it becomes necessary to seal the cables at the wellhead.

Known devices for sealing one or more cables at the wellhead are cable glands installed in a pipe head sub. Cable entries include a housing, a sealant installed in the housing, having at least one cable hole, elements that secure the seal and cable.

A cable entry is known for sealing an electric cable at the wellhead, comprising a housing, a sealant installed in the housing with three holes for entering cable cores and side slots for entering cable cores into openings, a pressure nut applied to the housing, acting on the sealant through axle box, washer mounted on the seal. The side slots for the input of cable conductors and the holes for the input of cable conductors are located in the sealant as follows: the side slots are made to two holes, of the two holes there are side slots to the third hole. When removed from the housing, the seal becomes detachable (RF patent No. 87144, priority date: 05/04/2009, IPC: E21B 33/03).

The design of the known cable entry does not allow simultaneously with the electric cable to seal the additional cable at the wellhead. An additional cable may be a geophysical cable. The inability to simultaneously perform several operations in the well leads to an increase in the time required to perform these operations, and, consequently, to a decrease in the volume of oil or gas production, to an increase in the time for conducting geophysical surveys.

Known cable entry, the design of which allows simultaneously with the main cable to seal an additional cable at the wellhead. The cable entry comprises a nut having an inner annular protrusion; a housing in which a part of the inner surface is tapered, a thread is made on the outer surface for connection with a nut; a sealing sleeve having a tapered outer surface, cuts for the main cable and an axial hole for the additional cable; a metal sleeve with a rotation lock and a pressure washer installed between the inner annular protrusion of the nut and the upper part of the sealing sleeve; additional pressure washer installed under the sealing sleeve (RF patent No. 2465436, option 1, priority date: 10.06.2011, IPC: E21B 33/03).

Often, fountain fittings are installed in the well, in which the tube head sub is not large enough to install one of the known cable entries, but there is a need to withdraw at least one cable from the well. To equip the well’s fountain reinforcement with one of the well-known cable entries and output of at least one cable from the well:

- install a tube head sub having a larger diameter, which requires replacement of the tube head housing, tubing holder (suspension) of tubing installed in the tube head housing, column head housing to similar wellhead equipment having a larger diameter;

- in the pipe holder (suspension) of the tubing installed in the housing of the pipe head, make a hole for outputting at least one cable from the well.

Thus, in the event that fountain fittings are installed on the well, the design of which does not provide for the installation of a cable entry into the pipe head sub, the disadvantages of the known cable entries are:

- significant costs for the acquisition and installation of elements of wellhead equipment;

- the complexity of the output of at least one cable from the well.

The closest analogue of the claimed utility model is a cylindrical body of the tube head containing an axial channel, openings with lateral branches communicating with the axial channel, connecting flanges (RF patent No. 2170328, priority date: 29.11.2000, IPC: E21B 33/03).

The technical result of the claimed utility model consists in reducing the cost of acquiring and installing the elements of wellhead equipment necessary for outputting at least one cable from the well, and in reducing the complexity of outputting at least one cable from the well if installed fountain fittings, the design of which does not provide for the installation of a cable entry into the pipe head sub.

The technical result is achieved by the fact that a cylindrical housing of the tube head is declared, comprising an axial channel, openings with side bends communicating with the axial channel, connecting flanges, according to a useful model, the cylindrical housing of the tube head further comprises an opening for outputting at least at least one cable from the well and hermetically installed on the lateral surface of the cylindrical body closing hole for the output of at least m D, one cable from the cable entry hole, made in the form of a flange having at least one opening for a cable, which is installed inside the elements ensuring sealing and fixing of the cable.

Elements for cable sealing and fixing can be installed inside at least one cable hole to the left and right of the axis of the cable hole.

Elements that provide sealing and fixation of the cable can be hollow bolts, pressure conical washers, gaskets with holes for the cable, support conical washers.

An example of the design of the claimed utility model is illustrated by drawings.

In FIG. 1 shows the housing of the tube head, side view, where:

1 - hole;

2 - hole for the output of cables from the well;

3 - cable entry;

4 - hairpins (2 pcs.);

5 - upper mounting flange;

6 - lower connecting flange;

7 - side surface;

8 - holes for studs (8 pcs.);

9 - groove;

10 - a metal sealing ring;

11 - a hollow bolt (4 pcs.);

12 - pressure conical washer (4 pcs.);

13 - a sealant (4 pieces);

14 - supporting conical washer (4 pcs.);

15 - nut (2 pcs.).

In FIG. 2 shows a sealed cable entry, type A, where:

4 - hairpins (8 pcs.);

11 - a hollow bolt (2 pcs.);

15 - nut (8 pcs.).

The axial channel, side bends including connecting flanges, cable holes and stud holes located in the cable entry made in the form of a flange are not shown in FIG. 1 and FIG. 2.

The cylindrical body of the tube head contains an axial channel, holes 1 with lateral branches communicating with the axial channel, a hole 2 for outputting cables from the well, a cable entry 3 made in the form of a flange having two holes for the cable and holes for the studs 4, the upper connecting flange 5, lower mounting flange 6.

In order to hermetically connect the connecting flange of the lateral outlet to the cylindrical body of the pipe head, holes 8 for the studs and a groove 9 for the metal sealing ring are made around the hole 1 in the side surface 7 of the cylindrical body of the pipe head.

In order to tightly connect the cable entry 3, made in the form of a flange, with the cylindrical body of the pipe head in the side surface 7 of the cylindrical body of the pipe head around the hole 2, holes for the studs 4 and a groove for the metal sealing ring 10 are made.

Inside each hole for the cable to the left and right of the axis of the hole for the cable are elements that provide sealing and fixing of the cable: a hollow bolt 11, a pressure conical washer 12, a seal 13, a support conical washer 14. As a seal 13, a gas-oil-resistant rubber or polyurethane can be used sealant.

The inventive cylindrical body of the pipe head is made by supplementing the cylindrical body of the pipe head, which is part of the fountain fittings installed in the well, with a cable entry 3 made in the form of a flange. To do this, the fountain fittings installed on the well are dismantled; on the side surface 7 of the cylindrical body of the tube head, a flat platform is drilled with a cutter, in which a hole 2 is drilled to bring two cables out of the well, holes for the studs 4 and a groove for the metal sealing ring 10. Fountain fittings are installed on the well.

Cable entry 3, made in the form of a flange, is collected as follows. An electric cable that provides power to the submersible oil pump motor and a distributed fiber-optic sensor cable for geophysical surveys are removed from the borehole through hole 2. Elements that provide sealing and fixing of the cable are strung on the electric cable: hollow bolt 11, pressure conical washer 12, seal 13, the conical washer 14. The electric cable is pulled through the hole for the electric cable made in the cable entry 3. The hollow bolt 11 is screwed into the hole for electric cable. In the same way, the distributed fiber-optic cable-sensor is sealed and fixed in the hole for the distributed fiber-optic cable-sensor made in the cable entry 3. A metal sealing ring 10, lubricated on both sides with a mixture of solidol and graphite, is installed in the groove. The cable entry 3, made in the form of a flange, is hermetically attached to the side surface 7 of the cylindrical body of the tube head with studs 4 and nuts 15. Elements that provide sealing and fixing of the cable are strung on the electric cable: support conical washer 14, seal 13, pressure conical washer 12, the hollow bolt 11. The hollow bolt 11 is screwed into the hole for the electric cable. In the same way, the distributed fiber optic sensor cable is sealed and fixed in the hole for the distributed fiber optic sensor cable made in the cable entry 3.

Variants of the design of the utility model are possible, in which the cable entry is made in the form of a flange having one, three, or four holes for the cable. At the same time, inside each hole for the cable, elements are installed that provide sealing and fixation of the cable.

The use of the inventive housing of the pipe head containing a sealed cable entry in a fountain fitting, the design of which does not provide for the installation of a cable entry in the sub of the pipe head, provides:

- reduction in the cost of acquiring and installing wellhead equipment elements necessary for outputting at least one cable from the well (replacement of a pipe head sub, a tubing holder of tubing, a column head housing is not required);

- reducing the complexity of the output of at least one cable from the well (it is not necessary to make an opening for outputting at least one cable from the well in the tubing holder of the tubing and pulling at least one cable through this hole).

Claims (3)

1. The cylindrical housing of the tube head containing an axial channel, openings with side bends communicating with the axial channel, connecting flanges, characterized in that it further comprises a hole in the lateral surface of the cylindrical housing for withdrawing at least one cable from the well and hermetically a closing hole mounted on the side surface of the cylindrical body for withdrawing at least one cable from the well a cable entry made in the form of a flange having at least measures e, one hole for the cable, inside of which are installed elements that provide sealing and fixation of the cable. 2. A cylindrical housing according to claim 1, characterized in that the elements that provide sealing and fixing of the cable are installed inside at least one cable hole to the left and right of the axis of the cable hole. 3. The cylindrical housing according to claim 1, characterized in that the elements providing sealing and fixing of the cable are hollow bolts, pressure conical washers, seals with holes for the cable, support conical washers.

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