SU1283439A1 - Gas lift hoist for well pipes - Google Patents

Abstract

The invention relates to the field of gas dynamics and can improve performance by more fully sealing the annular space between the sealing element (CI) 5 and the internal cavity of the pipes. The piston 3 is agitated upwards, the liquid is driven into the working cavity of the UE 5. The rod 4, which has a shock absorber, is fixed by a lock 8 and sealed. inside the pipes. The radial channels 2 overlap, ensuring the tightness of the overlap of the cavity between the UE 5 and the pipe string. The remaining liquid penetrates through the holes 6 into the cavity of the piston 3 and hits the diaphragm 7, which damps its oscillations. 1 hp f-ly, 1 ill. (L h o 00 with 4; 00; o

Description

This invention relates to a technique for raising bottomhole fluids from greater depths using formation energies such as gas.

. The purpose of the invention is to increase the air flow through a more complete sealing of the annular space between the sealing element and the internal cavity of the pipes.

The drawing shows the proposed lift.

The gas lift for well pipes includes a housing 1 with radial channels 2, a piston 3 mounted inside it with a stem 4 and a fixing unit and an outside elastic sealing element 5, and the piston 3 is made with a hole 6 in its upper part and provided with a damping diaphragm 7, and the fixing unit can be made in the form of a spring-loaded ball lock 8, and recesses 9 are made on the rod 4, while the rod 4 is provided with a shock absorber made in the form of a toroidal elastic chamber 10 filled with boiling liquid.

The lift works as follows.

The device is freely lowered into the tubing string and drops to the face under the weight. During the fall, the piston 3 is in the lower position, the working cavity of the elastic sealing element i5 is mostly empty and therefore the outer diameter of the riser is smaller than the internal diameter of the column. After the fall on the bottom, the lifter hits and sinks into the water. Due to the impact force, the piston 3 moves up, the liquid is pushed into the working cavity of the sealing element 5, the rod is fixed by the lock 8 and is installed inside the housing 1. At this time, the liquid left in the housing 1 enters the hollow piston 3 through the holes 6, presses on the diaphragm 7, deform it, and squeeze,

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This allows air to close the radial channels 2 when the weight of the piston 3 is increased and to ensure the tightness of the cavity between the sealing element 5 and the tubing, at which time the piston oscillator turns into a plug.

The downhole temperature acts on the light boiling liquid, uses it and inflates the chamber 10, increasing the baking force. During this time, the gas flow from the reservoir begins to press the lift from the bottom upwards and at a certain value of the gas bottomhole pressure the lift begins to rise with a water column located above the lift. A raised volume of water, when it reaches the level of the wellhead equipment, is poured into the drainage channel, and. The lift hits the upper shock absorber. The rod 4 is bent down, the sealing element is emptied, and the device falls. The water lift cycle is repeated.

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Claims (2)

1. Gas-lift for well pipes, comprising a housing with radial channels, an internal piston with a rod and a fixing unit, and an elastic outside a sealing element, characterized in that, in order to increase productivity by more completely sealing the annular space between the sealing the element and the internal cavity of the pipes, the piston is made hollow with holes in its upper part and provided with a damping diaphragm „ 2. Gas lift according to claim 1, characterized in that the rod is provided with a shock absorber formed in the form of a toroidal elastic chamber filled with light boiling liquid.