SU1470935A1 - Device for well coverage - Google Patents

Abstract

The invention relates to the oil and gas industry. The goal is to increase the efficiency of the device. It consists of a housing 1 with a central bore (K) 2 and a saddle 3 under which the locking member 4 is fixed, fixed in the hull 1 by the locking clamp 5. In the hull the chamber 6 is hydraulically connected to K 2 to accommodate the locking member 4 in which a guide element 7 for moving the closure member 4. Under the saddle 3 there is an additional eccentric channel (EC) 8 in the form of a diffuser for accommodating the float 9 with negative buoyancy. The diameter of the inlet 10 and outlet 11 of the diffuser holes is smaller than the outer diameter of the float 9. Under the seat 3, there is a disk-shaped valve 12 connected to the retainer 5. The well output enters the EC 8 and keeps the float 9 in suspension. In doing so, the valve 12 closes K 2, and the locking member 4 is in the lower position. When exposed to a critical flow rate, the float 9 closes the opening 11, the production flow leads from the retainer 5 to the locking body 4, which sits in the saddle 3 and closes the K 2. To open the device, pressurized fluid is injected into the well, which diverts Ø 4 through element 7 and retainer 5 At the same time, the valve 12 opens, and the float 9 closes the opening 10. After stopping the injection, the valve 12 closes and the lock 5 locks the locking member 4 in the lower position. 1 il.

Description

one

The invention relates to an oil and gas industry, namely, devices that prevent the open flow of wells in emergency situations,

The purpose of the invention is povypenie efficiency of the device,

Figure; shows a device for blocking a well, general view

The device consists of a body 1 s; a central passageway 2 and a saddle 3. Underneath the saddle is a zgaporny body 4 having negative buoyancy that can be coded in the housing in the open position with a 4x housing 5. In the housing 1 there is a chamber 6 for accommodating the closure member hydraulically connected channel.2. In the chamber 6 there is a guide element 7 for moving the locking member 4. Under the saddle 3: an additional eccentric passageway 8 is made in the housing in the form of a diffuser, in which the heat 9 is placed, which has negative buoyancy. The diameter of the inlet 10 and outlet 11 of the diffuser holes is smaller than the outer diameter of the float 9.

Under the saddle 3 is installed with the possibility of closing the channel 2, the disc valve 12, kinematically connected with the latch 5.

The device works as follows.

Before the device is lowered into the well, the geometrical dimensions of the diffuser of the channel 8, the float 9 and the holes -10 and 11 are determined by calculation depending on the planned flow rate of the well and the production density. At the same time, a range of expenses in the operating mode and a critical flow rate are set at which the device should operate and block the wellbore. The device is lowered into the well and secured in the casing 13 in a known manner above the perforation zone in a known manner. By smoothly opening the bottom; vyzhki at the wellhead causes the flow of fluid from the reservoir and the required flow rate from the range of costs in the operating mode. The SCF of the reservoir enters the well and enters the channel 8, raises the float 9. and, keeping it in suspension, rises to the surface through the central channel 2. At the same time, the rotary valve 12 closes the center of the al nal channel 2, and the locking member 4 - the opening 14. The greater the flow rate of the well bore liquid through the channel 8, the more the float 9 rises, approaching the opening 11.

In the chamber 6, the opening 14 at the lower position of the locking member 4 ensures its washing with an insignificant flow rate of the well fluid. For a closed well, it is necessary to ensure critical flow through channel 8. In this case, the float 9 overlap ief hole 11. The entire pg of tonnage to the wells

The liquid rushes through the hole 14 into the chamber 6, disengages from the lock 5, if present, the locking member 4, which sits in the saddle 3 and overlaps the well. After the central channel 2 is blocked by the locking member 4, the float 9 under its own weight returns to the lower position, blocking the opening 10. To open the well from the surface, the locking organ 4 is affected by a pressure that exceeds the reservoir. For example, a liquid is pumped from the surface under pressure, the locking member 4 opens the central channel 2 and rolls down or to the latch 5 along the guiding element 7, the fluid flow opens the valve 12, which by means of the lever 15 lifts the spring-loaded latch 5, making space for the locking organ 4 which moves to the lowest position, closing a large part of the hole 14. After stopping the injection of fluid from the surface, the spring-loaded latch 5 returns to the lower position, loosens the plug 4, akryvaet valve 12. Further, a smooth opening of the valve at the wellhead is set desired flow rate skva- zhinnoy liquid and apparatus pro

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935

should work in that order. The penetration into the perforation zone by means of a tool, instruments or a pipe tip is performed through the central channel 2. At the same time, the valve 12 opens mechanically.

Claims (1)

Invention Formula ten g A device for blocking a well, comprising a housing with a central bore and a saddle, a negative buoyancy organ, spliced under the saddle, and 1t is a chamber in the housing that is hydraulically connected to the central bore, which is characterized by the fact that it is equipped with a negative buoyancy float located under the saddle to move it under the saddle; locking organ and installed with the possibility of overlapping the central bore duct with a poppet valve, and in the case under the saddle, an additional eccentric bore duct in placing the float, and the diameter inlet and outlet diffi fusor is smaller than outer diameter the float.