RU2305747C1 - Dual-channel flow head equipment - Google Patents

Abstract

FIELD: oil production industry, well heads and setting-up thereof.

SUBSTANCE: flow head equipment comprises the first row pipe holder provided with two channels and the second row pipe holder having upper and lower threads. One of upper and low channels has upper and lower threads. The first row pipe holder is made as disc with orifices to be fastened to well head. The second row pipe holder is formed as hollow bush and may be directly secured inside the second channel of the first row pipe holder in air-tight manner.

EFFECT: increased reliability and decreased costs.

3 cl, 1 dwg

Description

The invention relates to the oil and gas industry, in particular to equipment wellhead with simultaneous separate operation of oil and gas wells.

The well-known "Wellhead equipment with parallel suspension of pipes" (AS SU No. 375369, ЕВВ 33/03, publ. Bull. No. 16 of 03/23/1973), including the pipe holder of the first row of pipes, the pipe holder of the second row of pipes with flanges , a coil with flanges, a sealing nipple, while the upper flange of the coil is eccentric relative to the axis of the coil, and the lower flange of the pipe holder of the second row of pipes is eccentric relative to the axis of the holder of the second row of pipes.

The disadvantages of this device are:

firstly, high metal consumption and design complexity due to the large number of parts, which reduces the reliability of the entire device as a whole;

secondly, the complexity of tripping operations, since it is necessary to disconnect at least one of the flanges of one pipe holder for carrying out tripping operations even with one row of pipes attached to the pipe holders;

thirdly, the difficulty of connecting ground equipment to the device due to the small interaxial distance between the axes, limited by the internal diameter of the well casing pipes and the diameter of the pipes in rows, for example, if two rocking machines are installed, they can touch each other with balancer heads.

The technical task of the invention is to reduce material costs and increase reliability by simplifying the design, reducing technological operations during tripping of rows of pipes, as well as simplifying docking with ground equipment.

The technical problem is solved by wellhead double-barrel fittings, including a pipe holder of the first row of pipes with two channels, one of which is equipped with upper and lower threads, and a pipe holder of the second row of pipes with upper and lower threads.

New is that the pipe holder of the first row of pipes is made in the form of a disk with holes for fastening to the wellhead, and the pipe holder of the second row is in the form of a hollow sleeve with the possibility of hermetic fixation directly in the second channel of the pipe holder of the first row of pipes.

It is also new that at least one of the axes of the upper threads of the pipe holders is offset or deviated relative to the corresponding axis of the lower thread.

Also new is the fact that on the pipe holder of the first row of pipes, samples are made above the part of the holes above the perimeter.

The drawing shows a diagram of the wellhead double-barreled reinforcement in axial section.

The double-barrel wellhead contains a pipe holder 1 of the first row of pipes 2 with two channels 3 and 4, one 3 of which is equipped with upper 5 and lower 6 threads, and a pipe holder 7 of the second row of pipes 8 with upper 9 and lower 10 threads. The pipe holder 1 is made in the form of a disk, and the pipe holder 7 is in the form of a hollow sleeve with the possibility of tight sealing directly in the second channel 4 of the pipe holder 1 using, for example, a threaded sleeve 11 with stuffing box 12, as well as sealing rings 13. To increase the center distance A between the flow lines 14 and 15 connected to the corresponding upper threads 5 and 9, at least one of the axes of the upper threads 5 and / or 9 of the pipe holders 1 and / or 7 is offset by a and / or b or rejected relative to the corresponding axis lower thread 6 and / or 10 at an angle α and / or β to the outside. To fix the pipe holder 1 (disk) after the first row of pipes 2 has been lowered, which does not interfere with the installation of, for example, a mechanical key (not shown), samples 16 are made around the perimeter of the disk 1 above its holes 17 for shortened studs 18 that fasten the wellhead double-barrel reinforcement to the wellhead 19.

The device operates as follows.

The first row of pipes 2, equipped with a bottom, for example a packer (not shown), is lowered into the well 19. Upon reaching the specified interval, the packer is installed in the well 19 by any known method, the first row of pipes 2 is connected to the lower thread 6 of the first channel 3 of the disk 1, and the last fixed at the wellhead 19 with shortened pins 18 installed in holes 17 with samples 16. Next, a second row of pipes 8 is lowered into the second hole 4 of the disk 1, the second hole 4 being made so that the second row of pipes 8 passes into it together with the couplings 20 . By Upon reaching the required interval, another row of pipes 8 is connected to the lower thread 10 of the second pipe holder 7 (hollow sleeve), which is sealed and fixed directly in the second channel 4 of the disk 1 using a threaded sleeve 11 with stuffing box 12 and O-rings 13.

To increase the axle distance A between flow lines 14 and 15 (for example, wellhead glands of the rod pump) connected to the corresponding upper threads 5 and 9, at least one of the axes of the upper threads 5 and / or 9 of the pipe holders 1 and / or 7 is shifted by the distance a and / or b or is deviated relative to the corresponding axis of the lower thread 6 and / or 10 by an angle α and / or β to the outside.

To produce the products of the well 19 using a sucker rod pump (not shown) from a sub-packer zone (not shown), the axial displacement and in the first channel 3 was about 8 mm.

To pump fluid into the over-packer zone (not shown) of the well 19, the deviation of the β axes in the second channel 4 was 7 °. The execution of the disk 1 with samples 16 after lowering the first row of pipes 2 and fixing the disk 1 with shortened studs 18 allows you to form a flat plane 21 on top of the disk 1 for installation and fastening with a standard stud 22 of a mechanical key or spider (not shown) for lowering the second row of pipes 8.

The proposed implementation of the wellhead double-barrel fittings allows to reduce material costs and increase its reliability by simplifying the design, reducing technological operations during tripping of rows of pipes, as well as simplifying docking with ground equipment.

Claims (3)

1. Wellhead double-barrel fittings, including the pipe holder of the first row of pipes with two channels, one of which is equipped with upper and lower threads, and the pipe holder of the second row of pipes with upper and lower threads, characterized in that the pipe holder of the first row of pipes is made in the form of a disk with holes for fastening to the wellhead, and the pipe holder of the second row - in the form of a hollow sleeve with the possibility of hermetic fixation directly in the second channel of the pipe holder of the first row of pipes. 2. Wellhead double-barrel valves according to claim 1, characterized in that at least one of the axes of the upper threads of the pipe holders is offset or rejected relative to the corresponding axis of the lower thread in the outer side. 3. Wellhead double-barrel fittings according to claim 1 or 2, characterized in that on the pipe holder of the first row of pipes, samples are made above the part of the holes above the perimeter.