SU1629465A1 - Device for running pipes into well under pressure - Google Patents

Abstract

The invention relates to the mining industry and is intended for the mechanization of auxiliary drilling operations. The goal is to simplify the design and reduce the complexity of operation of the device. To do this, the cylinder (C) installed at the wellhead is made of two telescopically connected lower fixed 1 and upper partially movable 2 hours

Description

The invention relates to the mining industry, in particular, to devices for the mechanization of auxiliary operations in the drilling of wells, and can be used to carry out tripping operations with drill pipes under conditions of oil and gas production and well flowing.

The purpose of the invention is to simplify the structures and reduce the labor intensity of the device operation.

Fig. 1 shows the device at the time of the expansion of the next pipe, the section; figure 2 - the same, when descending the column.

The device comprises a cylinder adapted for mounting at the wellhead, made of two telescopically connected parts 1 and 2. Part 1 is the lower stationary part and 2 is the upper partly limited moving part of the cylinder, installed with coverage of part 1a. Limited movement of the movable part 2 is ensured by the presence restrictive rings 3 and 4, made respectively in the upper and lower ends of the movable part 2, and placed between them restrictive ring 5, made on the fixed part 1. The cylinder zhnoy its part 1 is mounted on the wellhead sealing head 6 through node 7 annulus.

The upper partly movable part 2 is spring-loaded relative to the fixed part 1 by a spring 8 of compression 5

0

five

0

five

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five

In the upper direction of Part 2, there is a back disk valve 9, and in the lower position is a stuffing box 10. The cylinder cavity is connected by means of valves to a high pressure source and a pressure release line (not shown). As a high pressure source, for example, a cementing unit can be used, connected by means of a three-way valve 1t to a cylinder cavity. A backward flap valve 9 serves to pass the discharge pipe 12. The upper end of the partially movable part 2 is adapted for mounting an elevator 13 onto it. As a device for installing an elevator 13, a guide cone 14 is used. The compression spring 8 is designed so that the weights installed on the upper end of part 2 of the elevator 13 was enough to set part 2 in motion and move it to the lower position.

The amount of movement of part 2 is selected from the condition that the upper part of the descent pipe 12 is located below the upper end of part 2 in the lower position of the descent pipe 12 and the upper position of part 2.

In the lower stationary part 1 of the cylinder there is a mechanism for holding a pipe string, made in the form of two horizontal rows of clamping dies 15 and power cylinders 16.

The device works as follows.

The first pipe of the descending column, holding it by the elevator 13 by the upper end (sub-lock), is lowered by the lower end into the guide cone 14. At this, the pipe, pressing on the plate of the check valve 9, opens it and enters the cylinder cavity. In the process of further lowering the pipe 12, the elevator 13 rests on the upper edge of the guide cone 14 and part 2, compressing the compression spring 8, is displaced down until the lower lock of the pipe passes the upper row of clamp dies 15, which are both dah are maximally moved apart by the power cylinders 16. Thereafter, the upper row of dies 15 are shifted, clamping the pipe 1 2 and releasing it from the elevator 13, which is retracted to the side. In this case, part 2 under the action of the spring 8 squeezes back to the upper initial position, and the valve plate 9, extending beyond the upper edge of the pipe 12, closes. All these operations are carried out with the dies of the wellhead head b (preventer) closed. The three-way valve 11 communicates the cylinder cavity with a high pressure source and at the same time the force cylinders 16 weaken the clamping of the pipe 12 by the upper row of dies 15. The pipe 12 lowers under its own weight, the passage with tension goes through the opening of the sealing element of the annular seal assembly 7, until it stops the lower lock into the wellhead plate dies 6. Thereafter, the bottom row of dies 15 are fully diluted, the wellhead die plates are opened & and, increasing the pressure in the cylinder cavity, push the pipe 12 into the well until the lower edge of the upper pipe lock stops in the upper row of dies 15. Lower the lower row of dies 4 and scout the upper row, deliver the pipe 12 to the corner of its upper the lock in the bottom row of dies and clamp in them the pipe 12,

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from 5 0 0 5 0

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whereupon a cylinder cavity with a pressure relief line is communicated via a three-way valve 11.

Elevator 13 seize the next pipe 12 and lower it into the cavity of the cylinder before landing it on the previous pipe. Rotating the upper pipe 12 with a mechanical key with a grip on the upper lock (above the elevator), screw it with the lower pipe and, in the same sequence of operation as for the first pipe, lower the pipes into the well again until the upper lock stops in the lower row of clamp dies. In this way, the whole column is raised and lowered.

F o rm ula invention

A device for lowering pipes into a well under pressure, comprising a cylinder installed at the wellhead, the cavity of which is connected by means of valves to a high pressure source and a pressure relief line, a retaining mechanism for the pipe string and an annular sealing assembly, characterized in that simplifying the design and reducing the laboriousness of operating the device; mutually spring-loaded in the direction of movement of the restrictedly movable part to the upper position, the upper end of the restrictedly movable part is equipped with a back plate valve to pass the pipe and configured to install an elevator on it to move the restrictedly movable part to the lower position so that the upper part of the retractable pipe can be located below the upper end part of the movable part in the lower position of the descent pipe and the upper position of the movable part of the cylinder.

FIG. I

Claims (1)

F about r'm ula inventions 20 A device for lowering pipes into a well under pressure, comprising a cylinder configured to be installed at the wellhead, a cavity 25 of which is connected by means of a fan with a high pressure source and a pressure relief line, a pipe string holding mechanism and an annulus sealing assembly, 30 the fact that, in order to simplify the design and reduce the complexity of the operation of the device, the cylinder is made of two telescopically connected parts 25 of the lower, stationary, and upper - limited movable, which they are mutually spring-loaded in the direction of movement of the limited movable part to the upper position, the upper 40 end of the limited movable part being equipped with a check valve to allow the pipe to pass through and configured to install an elevator on it to move the limited 45 of the movable part to the lower position with the possibility of arranging the location of the upper part the lowering pipe below the upper end of the restrictedly movable part with the lower position 5Q of the lowering pipe and the upper position of the moving part of the cylinder. 1/7