RU2481500C2 - Plant for fluid pull out from well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: plant for fluid pulling out from the well is obtained via tubing string filled with material absorbing fluid. The bottom end of the string is mounted in fluid layer and the top one - in vacuum tank equipped with air and drain valves connected by the rod, in which there moves a float gauge that opens and closes the valves under the influence of float gauge movement on the top and bottom limiters.

EFFECT: possibility to perform fluid pulling out of the well without application of downhole pumping equipment.

3 dwg

Description

The invention relates to methods and devices for lifting liquids from wells and can be used to lift both oil and water from underground sources.

Known substitution pump for pumping oil from a well, containing a borehole string, the lower end of which is installed in a liquid, a pneumatic chamber with a lower valve, a gas or air main pipe, a discharge pipe for the exit of the gas-liquid mixture, operating as an airlift (SU 41346 A, 31.01. 1935).

A disadvantage of the known invention is the complexity of the design of the pump and its manufacture, the need to supply gas or air for the operation of the pump. In this case, a gas-liquid mixture is supplied to the surface.

Closest to the claimed one is a pneumatic deep pump containing a borehole string, the lower end of which is installed in a liquid, a spool connected to a rod with a float installed on it and having an upper limit for it (SU 40719 A, 12.31.1934).

The disadvantage of this invention is the use of expensive pumping equipment, the need for compressed air or gas for pump operation.

The objective of the claimed invention is the exclusion of the use of downhole pumping equipment and the supply of compressed air or gas for pump operation.

The technical result is achieved by the fact that in a pneumatic deep pump containing a borehole string, the lower end of which is installed in a liquid, a spool connected to a rod with a float installed on it and having an upper limiter for it, the borehole string is filled with material that absorbs the liquid and its upper end placed in a vacuum container equipped with air and drain valves, the float is freely mounted on the rod with the ability to open and close the valves when moving and acting on the upper and lower limiters of movement, while the vacuum tank in its upper part is connected to the vacuum pump, in the lower - with the receiving tank.

The technical result is achieved in that the vacuum tank is connected to the receiving tank by means of a drain valve, and the air drawn from the vacuum tank is supplied to the receiving tank.

Figure 1 shows the installation, General view:

figure 2 is a section aa of figure 1. (valves are closed);

figure 3 is a section aa of figure 1. (valves open).

Installation for lifting liquids from a well contains: a borehole string 1 with absorbent material 2, a liquid 3, a vacuum tank 4 with an air 5 and a drain 6 valve equipped with spools 7 and openings 8, a float 9 freely moving along the rod 10, the upper rod is installed on the rod 11 and lower 12 limiters of movement of the float.

The upper part of the vacuum tank 4 is connected to the vacuum pump 13, and the lower part to the receiving tank 14, through the drain valve 6.

The vacuum pump 13 through the pipe 15 takes air from the vacuum tank and delivers it through the pipe 16 to the receiving tank 14.

The receiving tank 14 is connected to the atmosphere by an air tube 17; a pipe 18 serves to collect liquid from the receiving tank.

Installation works as follows.

In the well string 1, the liquid 3 rises through the absorbent material 2 into the vacuum container 4, which is caused by the capillary phenomenon, since high capillary pressure is created in the thin pores of the absorbent material.

The low pressure in the vacuum container provides the separation of the liquid from the absorbent material and its selection. As the liquid accumulates in the vacuum container, the float 9 rises after the liquid level and abuts against the upper limiter 11 and raises the rod 10 and spools 7 in the air 5 and drain 6 valves, opening holes 8. Thus, atmospheric air is opened into the vacuum container and draining the liquid into the receiving tank 14.

The operation of the vacuum pump 13 is connected with the air valve 5. When the air valve 5 is opened, the pump is turned off, when closed, it is turned on using the limit switches (not shown in the figures). Thus, the installation works in automatic mode: filling the vacuum tank - the pump works, draining the liquid from the vacuum tank - the pump does not work.

Since oil vapor is contained in the vacuum container together with air, the pump ejects air from the vacuum system through the pipe 16 to the receiving tank 14. From the receiving tank, the liquid is pumped through the pipe 18.

The present invention allows the lifting of fluid from the well to the surface without the use of sophisticated downhole equipment, which will significantly reduce the cost of production costs for the production of fluids.

Claims (1)

Installation for lifting liquids from a well, comprising a downhole string, the lower end of which is installed in the fluid, a vacuum container, air and drain valves, a spool connected to the rod and a float mounted thereon, having an upper limit stop for it, characterized in that the downhole string filled with liquid-absorbing material, and its upper end is placed in a vacuum container equipped with air and drain valves, the float is freely mounted on the rod with the possibility of opening and closing valves When moving it and acting on the upper and lower limiters of movement, the vacuum tank in its upper part is connected to the vacuum pump, and in the lower to the receiving tank, the vacuum tank connected to the receiving tank using a drain valve, and taken from the vacuum tank air is supplied to the receiving tank.

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