SU651120A1 - Well closure device - Google Patents

Description

one

The invention relates to a technique for extracting oil, in particular, devices for shutting off an oil well in order to prevent open spouting in case of a leak in the wellhead and repairing above-ground and underground equipment.

A well shut-off device is known, comprising a packer with a check valve, a cylinder mounted above the packer with a spring-loaded piston and a rod attached to the piston abutting the checker check valve 1. In it, in order to allow the well to shut off automatically when the pump stops, the bypass valve tube cylinder communicated with the column pipe above the installation site Hfcoca.

However, such a device has a limited scope, is complex in design and is not reliable enough in operation. When it is lowered into the well, a small diameter bypass pipe hits the walls of the well, is removed, loses tightness. In the process of oil production, the tube is clogged with sand and paraffin, and the spring supporting the piston changes the force

characteristic, corrodes and goes out of order.

A device for blocking a well is known, comprising a packer with a check valve, a nozzle with radial channels, a cylinder rigidly connected to the nozzle and a piston with a rod, forming a chamber 2 with the cylinder.

The life of this device is limited by the service life of the packer check valve. If the check valve is not tight, it is necessary to shut down the well and remove the packer.

The purpose of the invention is to increase the reliability of the device in case of a leakage check valve.

The goal is achieved by the fact that it is equipped with a sleeve rigidly connected to the nozzle and a valve placed below the nozzle channels, the valve of which is rigidly connected to the stem.

Claims (2)

This design of the device has a significantly longer service life, since in it the automatic opening and closing of the well is provided by a valve attached to the nozzle, which can be removed together with the cylinder without killing the well. The drawing shows the proposed device in the position when the well is not covered. The device includes a packer 1 with a spring-loaded check valve 2. A cylinder 3 with a piston 4 and a pipe 5 is installed on the packer. A valve consisting of seat b and valve 7 is attached to the lower part of the pipe. The valve is attached to the bottom end of the rod 8 screwed into the piston 4, a collar 9 with a ring 10 is attached to the saddle b for sealing in the packer. The cavity of the cylinder under the piston and the passage of the sleeve 9 through the holes 11 in the pipe ke 5 communicated with nadpaknerny space. The cylinder cavity above the piston is filled with compressed gas. Cylinder 3 with parts attached to it is lowered into the well and removed from it on a string of pipes 12 separately from the packer. When planting the pipe string on the packer, the sleeve 9 fits tightly into the barrel of the packer 1 all the way into the check valve 2 and opens it. At the same time, the piston 4 with the rod 8. under the action of the hydrostatic pressure of the well fluid occupies the uppermost position, and the locking element 7 closes the saddle 6, preventing the possibility of open flow of the well during the installation of the wellhead equipment. After the well is put into operation (i.e., the pump, compressor lift, or fountain is turned on), the pressure at the depth of the packer is reduced. In this case, under the action of compressed gas in the cylinder, the piston with the rod moves downwards and opens the saddle 6, ensuring that the reservoir does not flow from the reservoir into the over-pack space. When the tubing with the cylinder and bushing is raised, the packer check valve closes under the action of the spring and prevents the well from flowing. The device allows extending the service life of its packer with a check valve, reducing the cost of repairing wells, increasing the efficiency of their operation and increasing the oil production from them. The invention The device for blocking the well, including a packer with, a check valve, a nozzle with radial channels, a cylinder rigidly connected to the nozzle, and a piston with a rod, forming a chamber with the cylinder, so as to increase the reliability of the device when the tightness of the check valve is impaired, it is provided with a sleeve rigidly connected to the nozzle and a valve placed below the nozzle channels, the valve of which is rigidly connected to the stem. Sources of information taken into account in the examination 1. Yu.V.Zaytsev. and others. Equipment for preventing open fountains of oil and gas wells. M., Nedra, 1973, p. 148. 2. Forward number 2137394, according to which the decision to issue an author's certificate was made.