SU1490257A1 - Gas-lift valve - Google Patents

Abstract

The invention relates to the oil industry. The purpose of the invention is to increase the reliability of the device. The valve consists of a housing (K) 1, a saddle 2 with a flow channel that forms the upper and lower communicating cavities 3 and 4 with K 1, and a check valve 5 located under the saddle 2. In the cavity 3 there is a main bellows 6, which forms a chamber with K 1 7 for compressed gas. In K 1 there is a rod (W) 8 with a bolt 9. At the top of W 8, it is associated with a bellows 6, under which an additional bellows 10 is located, forming a chamber 11 with the bellows 6. The top of the bellows 10 is connected to K 1 and the bottom is connected to W 8, in which channels 12 are made to connect the cavity 4 with the chamber 11. The shutter 9 has a shank 13, the lower end of which is located in the cavity 4 above the valve 5. The outer diameter of the bore of the seat 2, the outer diameter Ø 8 and the average diameter of the bellows 10 are equal to each other . Before descending into the well, chamber 7 is charged with compressed gas. The charging pressure is equal to the pressure of the control medium, which through the cavity 4 and channels 12 acts on the entire area of the bellows 6 with a force equal to the product of the control pressure and the area of the bellows 6. This force compresses the bellows 6 and 10 and moves W 8 up. In the seat 2, an inlet passage for the injected gas is formed. When the gas is supplied through the annulus, the control is the pressure of the gas-liquid mixture in the riser pipe. When gas is supplied through the riser string, the control pressure is the gas pressure. 1 il.

Description

The invention relates to the oil industry and, in particular, to the operation of wells by a gas-lift method.

The purpose of the invention is to increase the reliability of the gas-lift valve operation by opening the shutter by the pressure of the liquid in the column of lifting pipes

The drawing shows a schematic diagram of the gas-lift valve.

The device consists of a housing 1, a saddle 2 with a flow channel forming with the housing 1 an upper 3 and a lower 4 hydraulically connected cavities, and a check valve 5 located under the saddle 2. The main bellows 6 is installed in the upper cavity 3, forming a chamber 7 with the housing for compressed gas, in the case there is a rod 8 with a shutter 9, a rod 8 with an upper end rigidly connected to the main bellows 6, under which an additional bellows 10 is located, with the main chamber 11, the upper end of the pin 10 is connected to the case 1, and bottom - with a rod 8, in which The channels 12 are in communication with the cavity 4 with the chamber 11. The valve 9 has a shank 13, the lower end of which is located in the cavity 4 of the housing above the check valve 5. The outer diameter of the bore channel of the seat 2, the outer diameter of the rod 8 and the average diameter of the additional bellows 10 are equal by myself.

The valve operates as follows.

Before running into the well, the valve chamber 7 is charged with compressed gas, for example, nitrogen. Under this pressure

charging the main bellows 6 is determined by the ratio

PC

v.

(one)

where is pj. - pressure in chamber A of the main bellows 6 (charging pressure);

P is the pressure created by the control medium (gas-liquid mixture or injected gas) at the calculated depth.

Under the pressure of charging the main bellows 6, the valve is closed and in this position is lowered into the well. The pressure of the control medium through the holes 14 and the channels 12 acts on the entire area of the main bellows 6.

The force created by this is defined by the expression:

PV-SO.

(2)

where F is the force generated by the control medium (gas-liquid mixture or injected gas);

BO - the area of the main bellows. Under the action of this force, the bellows 6 and 10 are compressed, the rod 8 moves upwards, and in the saddle 2 a passage for the injected gas is formed, which enters the pipe lifting column (when gas is supplied through the annulus) and aerates the well fluid. surface. When the gas is supplied through the annulus, the control is the pressure of the gas-liquid mixture in the crown of the riser. When gas is supplied at the crown of the riser tubes, the control pressure is the discharge gas pressure.

Claims (1)

1. A gas-lift valve comprising a housing, a saddle with a flow channel, forming upper and lower hydraulically connected cavities with the housing, a check valve located under the saddle, a main bellows mounted in the upper cavity and forming a compressed gas chamber with the housing the casing with a bolt, the upper end rigidly connected with the main bellows, and an additional bellows, located under the main chamber and with a chamber, the upper end of which is connected to the body, and the lower one with the rod, differing the fact that, in order to increase the reliability of its operation due to the opening of the shutter by the pressure of the liquid in the riser column, to communicate the lower cavity with the chamber between the bellows, and the shutter has a shank, the lower end of which is located in the lower cavity of the housing above the check valve. 2, a valve according to claim 1, characterized in that the outer diameter of the bore channel of the seat, the outer diameter of the rod and the average diameter of the additional bellows are equal.