RU2312985C1 - Gas separator of insert oil-well pump - Google Patents

Abstract

FIELD: oil industry, particularly to operate oil wells with high gas factor and with the use of inserted tubing pumps.

SUBSTANCE: body with conical seat is connected to flow string. Liner provided with suction valve in lower part thereof is joined to the body. Deep-well sucker-rod pump is installed in conical seat provided with seals. Arranged in receiving chamber of the sucker-rod pump is sliding piston with injection valve. Receiving chamber has suction valve. Cavities separated from hole clearance with membranes are arranged in the body. The membranes may sustain extreme pressure. Cavity is hydraulically communicated with liner interior through channel. Fishing chamber is arranged in the body.

EFFECT: possibility of emulsified oil and gas mixtures having increased gas factor production with the use of inert oil-well pumps provided with liners.

2 cl, 2 dwg

Description

The invention relates to the oil industry and is intended for the operation of oil wells with a high gas factor and the use of plug-in tube pumps.

A well-known sucker rod installation (RU 2186949 C2, 04/10/2000), in which during the oil production from the beginning of the upward stroke of the plunger free gas accumulated in the annulus of the well is introduced into the inner cavity of the cylinder to pump it together with the gas-liquid mixture, and at the end upward stroke of the plunger to increase the filling factor of the installation and ensure pumping of free gas into the internal cavity of the cylinder under the action of pressure of a liquid column located in the column of tubing, and annulus administered the separated liquid, which is sent to it on the walls of the tubing upstream under the action of gravitational force, wherein the separated liquid is throttled to further separation of gas therefrom and reducing the pressure in the inner cavity of the cylinder.

The disadvantage of this design is that during operation of the pump installation there is a constant hydraulic connection between the tubing cavity above the plunger of the well pump and the receiving cavity under the discharge valve of the plunger, which leads to the fact that due to a significant excess of the hydrostatic pressure of the liquid in the tubing string over the suction pressure the process of opening the suction valve is difficult, and the fact that it is the same hydrostatic pressure and prevents the removal of free gas from under the pump plunger.

Also known is a deep sucker rod pump (RU 2165010 C1, 08/16/1999), which includes a cylinder located in the cylinder with the possibility of reciprocating movement of the plunger with a discharge valve, a sleeve stop of the plunger, a suction valve located on the side, outside the range of the plunger.

The disadvantage of this design is that when the gas factor of the well is increased, a “cap” of free gas builds up above the pump plunger, which significantly reduces the pump filling factor and has an undesirable effect on the operation of the sucker rod pump unit. In addition, when the plunger moves downward, fluid from the oil pipe string flows freely into the annulus through the radial hole, thereby reducing pump performance.

Closest to the proposed technical solution is a borehole sucker-rod pumping unit (RU 2196249 C1, 05/11/2001) for pumping emulsion oils and gas-liquid mixtures, containing a tubing string with a shank, a sucker-rod pump with main and additional suction valves. The column has a supporting conical seat, in which a rod pump cylinder is mounted with its seating conical surface. Radial openings and the channel communicate with the cylinder cavity with an additional suction valve.

The disadvantage of this pump installation is that the design does not allow to pump out the water or liquid there from the bottom of the well. In addition, the problem of discharging free gas accumulating under the pump plunger has not been solved.

The objective of the invention is to provide the possibility of extraction of emulsion oils and gas-liquid mixtures with a high gas factor plug-in pumps equipped with shanks and the exclusion from operation of the shank after pumping the killing fluid.

The task is achieved in that in the gas separator of the insertion pump containing the tubing string having a conical seat, a shank, a sucker rod pump, an additional suction valve, according to the invention, the tapered seat is located in a housing having a tubing string connected to the tubing at least one cavity separated from the annulus by a diaphragm made with the possibility of destruction from the ultimate pressure, and a fishing chamber for fragments of the diaphragm s, is connected to the bottom of the housing with a shaft mounted in its lower part an additional valve, wherein the body cavity is connected with the interior of the liner through the channel.

The conical seat can be equipped with seals. Figure 1 presents the operation diagram of the gas separator of the plug-in pump, operating during well development, figure 2 - operation diagram of the gas separator during oil production.

A housing 2 with a conical seat 3 is attached to the tubing string 1, a shank is attached to the bottom of it, the suction valve 5 is installed at the bottom of it. In the conical seat 3, equipped with seals 6 and 7, a deep-well rod pump 8 is installed, inside which the receiving chamber 9 moves a plunger 10 with a discharge valve 11. The receiving chamber 9 is equipped with a suction valve 12. In the housing 2 there are cavities 13 that are separated from the annulus 14 of the well by diaphragms 15 that are designed for ultimate pressure. The cavity 13 is hydraulically connected to the inner space 16 of the shank 4 by means of a channel 17, a fishing chamber 18 is arranged in the housing 2. The plunger 10 is connected to a rocking machine (not shown in the diagram) using a string of pump rods 19.

The gas separator works as follows (Fig. 1) During well development after drilling or overhaul, killing fluid is pumped out of the bottom of the well. With the upward stroke of the plunger 10, the pressure in the intake chamber 9 of the pump 8 decreases, the suction valves 12 and 5 open and the intake chamber 9 is filled with liquid from the bottom of the well through the shank 4. The discharge valve 11 of the plunger 10 is closed and the liquid located above the plunger 10 along the tubing string 1 is fed to the wellhead. With the downward stroke of the plunger 10, the pressure in the receiving chamber 9 increases, the suction valve 12 is closed, and the liquid through the open discharge valve 11 flows into the cavity 20 located above the plunger 10.

Next, the cycle repeats. The process continues until complete killing fluid is extracted from the bottom of the well.

After that (figure 2) the annulus 14 to the mouth is filled with oil. And with the help of a pump unit (not shown) in the annulus 14 a pressure pulse is created that destroys the diaphragm, fragments of the destroyed diaphragm 21 fall into the fishing chamber 18 of the housing 2. Thus, a hydraulic connection between the annular space 14 and the inner cavity 16 of the shank opens 4 through the cavity 13 and the channel 17 of the housing 2, while the suction valve 5 of the shank 4 is excluded from work and remains constantly closed.

From this moment, the installation works as follows (figure 2).

During the upward stroke of the plunger 10, the pressure in the receiving chamber 9 of the pump 8 decreases and the suction valve 12 opens. The formation fluid from the bottom of the well rises along the annulus 14 to a dynamic level, while associated gas naturally rises from it, which rises to the wellhead and disposed of. The formation fluid freed from gas through the cavities 13 of the housing 2 through the channels 17 flows into the internal cavity 16 of the liner 4, then through the open suction valve 12 it enters the receiving chamber 9 of the pump 8, filling it. The plunger 10 with a closed discharge valve 11, moving up, pumps the formation fluid into the tubing string 1 and further at the wellhead.

During the downward stroke of the plunger 10, the pressure in the receiving chamber 9 increases and the suction valve 12 closes, at the same time, the discharge valve 11 opens and the formation fluid flows into the cavity 20 located above the plunger 10.

Next, the cycle repeats.

Thus, the proposed design of the gas separator can significantly reduce the influence of the gas factor during oil production, increase the fill factor of the deep-well sucker rod pump.

Claims (2)

1. The gas separator of the insertion pump containing a tubing string having a cone seat, a shank, a sucker rod pump, an additional suction valve, characterized in that the cone seat is located in the housing attached to the tubing string having at least one cavity, separated from the annulus by a diaphragm made with the possibility of destruction from ultimate pressure, and a fishing chamber for fragments of the diaphragm, a shank connected to the bottom of the housing Formation in its lower part an additional valve, wherein the body cavity is connected with the interior of the liner through the channel. 2. The gas separator according to claim 1, characterized in that the conical seat is equipped with seals.

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