RU92082U1 - PREFABRICATOR REMOVABLE DISPLAY - Google Patents

Abstract

The invention relates to the oil and gas exploration and exploration industries and is intended for sealing the pipe channel of drill and tubing by cutting them in the liquidation of emergencies, as well as open gushing, in oil and gas wells that are being drilled or operated.

The aim of the invention is to enable reliable sealing of the pipe channel by cutting the pipe, stopping the leakage of the borehole medium into the atmosphere and then killing the well by injecting liquid into the barrel, when other methods of eliminating accidents or open gushing due to violation of the integrity of the thread of the sleeve connection or bending deformation of the pipe itself cannot be performed.

This goal is achieved in that the preventer, due to the detachable design of the support clamp and the housing, is installed on the pipe for cutting and sealing the pipe channel in a quick and efficient manner in any place accessible to it.

Description

The invention relates to the oil and gas exploration and exploration industries and is intended for sealing the pipe channel of drill and tubing by cutting them in the liquidation of emergencies, as well as open gushing, in oil and gas wells that are being drilled or operated.

A device of a preventer with cutting dies (1, p. 102 ... 110) is known, which is one of the elements in a set of blowout equipment mounted at the wellhead during drilling and designed to seal the wellhead during an accident (open flowing) the fastest and most effective way - cutting the pipe passing inside it, when other measures taken to eliminate emergency situations do not lead to the desired result.

However, the known device has the following disadvantages:

- according to the existing regulatory technical regulations for tying the wellhead with blowout equipment, a preventer with shear dies is installed only in wells with complicated (extreme) drilling conditions: at abnormally high reservoir pressures, during offshore drilling (1, p. 102), as well as before opening a productive horizon with the content of hydrogen sulfide and other aggressive substances (1, p. 244 ... 246);

- if it is not installed at the wellhead complete with mounted blowout equipment, it cannot be installed separately on the pipe from which the free flow of the borehole medium under pressure occurs, due to the integrity of its body, made in flange design;

The aim of the invention is to enable reliable sealing of the pipe channel by cutting the pipe, stopping the leakage of the borehole medium into the atmosphere and then killing the well by pumping liquid into the barrel (2, p. 143), when other methods of eliminating accidents (open flowing) due to integrity failure the threads of the coupling joint or the bending deformation of the pipe itself cannot be performed.

This goal is achieved by the fact that a detachable shear preventer, consisting of a support clamp, a housing, movable and fixed knives, a hydraulic cylinder and a locking element, is installed on the pipe for cutting and sealing the pipe channel in any accessible to it due to the detachable design of the support clamp and the housing location.

The design of the preventer is shown in figure 1; figure 2 - the position of its executive bodies after cutting the pipe.

It consists, Fig. 1, of two half-clamps 1 and 2, constituting the assembly of the support clamp, two parts of the body - the main 3 and the response 4, covers 5 and 6, the gate 7 with the knife fixed on it movable 8, the knife fixed 9, the hydraulic cylinder 10 with a piston rod 11 connected to the plunger 7. A support sleeve 12 with an internal square hole is screwed into the internal threaded hole of the piston rod. The latter can progressively move together with the piston rod over the square surface of the latching rod 13 installed in the cover of the hydraulic cylinder 14. The latching rod 13 can be rotated by the steering wheel 15. A shutter element 16, for example, a ball valve, is installed on the main part of the housing 3. The half-clips 1 and 2 are mounted on the pipe by bolted connections 17 and are held on it by wedge crackers 18 with a serrated notch installed in the nests 19 of the half-clips. The main part of the housing 3 and the return 4 are fastened to each other by threaded connections 20. To the clamp, the supporting housing assembly is fastened by threaded connections 21. The inner cavity of the housing is sealed by a detachable elastic seal 22 covering the pipe, seals 23 installed around the perimeter of the parts joining plane housing, as well as seals 24. In the lower part of the gate 7 is made an annular groove, forming a cavity A.

Sealing the pipe channel when the borehole medium expires from it under pressure and subsequent killing of the well is as follows, Fig.2.

On the free section of the emergency (gushing) pipe, half-clamps 1 and 2 are mounted, fastening to each other, on which the main 3 and the reciprocal 4 parts of the body are mounted, followed by pulling them together. The locking element 16, to which the pipeline for pumping in the injection fluid is connected, must be closed. A working fluid is supplied under pressure to the piston cavity of the hydraulic cylinder 10, from which the piston rod 11 moves together with the gate 7 by the stroke L, which will lead to cutting pipe, after which by turning the steering wheel 15 the piston rod is fixed in the engaged position. The cut-off part of the pipe is removed from the wellhead, through the pipeline to the shut-off element 16 (arrow B, Fig. 1), a pressurizing fluid is supplied under pressure, which, after opening the shut-off element, is pumped through the cavity A, which communicates with the pipe channel of the cut pipe, to well to its complete silencing.

Information sources

1. G.M.Gulyants "Blowout equipment of wells resistant to hydrogen sulfide", reference manual, Moscow, "Nedra", 1991

2. V.R. Radkovsky et al. “Equipment and tools for the prevention and elimination of fountains”, reference book, Moscow, “Nedra”, 1996

Claims (1)

A detachable split preventer, consisting of a support clamp, a housing, movable and fixed knives, a hydraulic cylinder and a locking element, characterized in that due to the detachable design of the support clamp and the housing, it can be installed on the pipe for cutting and sealing the pipe channel in any place accessible to it .