RU80191U1 - Borehole Rod Installation for Simultaneous Separate Oil Production - Google Patents

Abstract

The utility model can be used for simultaneous and separate oil production from two reservoirs.

The purpose of the utility model is to simplify the design and increase the reliability of the pump unit.

The essence of the utility model is that in the known device, the plungers are interconnected by a rod, passing in the upper part into a short pipe with side openings for the flow of liquids of both layers through the discharge valve of the higher pressure plunger.

1 p. Fs; 1 ill.

Description

The proposed utility model relates to the oil industry and can be used for simultaneous and separate oil production from two layers.

Oil production from wells that opened two formations with different reservoir pressures, in some cases is complicated by the cessation of drainage of fluid from the reservoir with lower pressure. Downhole pressure in the productive section of this formation may exceed its reservoir value. Therefore, independent pumping of liquids from both layers is required, provided by special pumping equipment.

A device for a borehole sucker-rod pump for simultaneous and separate oil production, including a packer, uncoupled formations, a plunger with an additional side valve located, through which the fluid enters the hole made in the pump cylinder / 1 /. In the case of a lower location of the formation with high reservoir pressure, the side valve is connected through the tube with the sub-packer zone of the well. Also known installation, in which the liquid inlet into the side hole in the pump cylinder is made in the space between the pump housing and the additional pipe / 2 /.

Known devices have a significant drawback, namely, that the opening of the side hole in the pump cylinder occurs at the time the plunger has set already high (or even maximum) speed. The suddenly released volume in the pump cylinder cannot be immediately filled with liquid through the side opening. There is a degassing, a rupture of the jet and a breakdown in the filling of the pump.

Closest to the proposed utility model is a borehole sucker-rod pumping unit for simultaneous and separate oil production from two layers / 3 /. Installation is complex and unreliable

design due to the small diameters of the additional discharge valve and the need for a concentric channel in the upper part of the small diameter plunger.

The purpose of the proposed utility model is to simplify the design and increase the reliability of the pump unit.

This goal is achieved by the fact that in the known device containing plungers of large and small diameters arranged in series, a side valve, a tube connecting the side valve inlet with a sub-packer zone in the case of a lower location of the formation with high pressure, the plungers are interconnected by a rod passing in the upper part in a short pipe with side openings for the flow of fluids of both layers through the discharge valve of a large diameter plunger.

Figure 1 shows a diagram of the proposed utility model. A pumping unit consisting of articulated cylinders of large 2 and small 3 diameters is lowered into the well on a string of tubing 1. The cylinder of small diameter through the pipe 4 is connected to the packer 5, separating the upper A and lower B layers. Plungers 6 and 7 have valves 8 and 9 and are interconnected by a rod 10, passing in the upper part into a short pipe 11 with side holes. The cylinder of small diameter has a receiving valve 12, and the upper part of the side valve 13.

The scheme shown in Fig. 1 assumes an upper location of the reservoir with high reservoir pressure.

In the case of a lower location of the formation with high pressure (Fig. 2), a tube 14 with an opening 15 is located under the side valve 13 for the flow of fluid from the lower formation. To enter the pump fluid from the upper layer provided holes 16 in the pipe 4.

The operation of the installation is as follows. In the case of the upper location of formation A with high pressure during the upward movement of the plungers

through the valve 12, the liquid of the lower layer B. enters the cylinder of small diameter B. The volume of liquid enters the cylinder 2 to be released, which is the difference between the areas of the upper and lower cylinders

the upper layer A through the side valve 13. When the plungers move down, a mixed volume of liquids enters the cavity 6 through the discharge valve 8. The higher pressure of the upper layer through the valve 13 ensures that the valve 9 closes when the plungers move up and the liquid is sucked through the valve 12 from the formation B with a small reservoir pressure.

With a lower location of the high-pressure formation (Fig. 2), the upward movement of the plungers may be accompanied by the closing of valve 13 and the termination of the flow of fluid from the formation A to the pump. Therefore, according to the diagram in Fig. 2, when the plungers move upward, the fluid of the formation B enters the pump through the opening 15 , tube 14 and side valve 13. Fluid of the upper layer enters the cylinder of small diameter through the hole 16.

The technical and economic advantage of the proposed utility model is the simplicity and reliability of the design.

Literature

1. Patent of the Russian Federation No. 2221136. Rod installation for the WEM of two objects of development.

2. RF patent No. 2293215. Well sucker rod pumping unit.

3. RF patent №2321771. Well sucker rod pumping unit for simultaneous and separate oil production from two layers.

Claims (1)

A downhole sucker-rod pumping unit for simultaneous and separate oil production, including successively plungers of large and small diameters, a side valve, a pipe connecting the inlet of the side valve with the sub-packer zone in the case of a lower location of the formation with high pressure, characterized in that, in order to simplify the design and increase its reliability, the plungers are interconnected by a rod passing in the upper part into a short pipe with side openings for the flow of fluids of both layers through the air pressure valve of the plunger of greater pressure.