RU2321771C1 - Oil-well sucker-rod pump unit for simultaneous separate production of oil from two beds - Google Patents

Abstract

FIELD: oil producing industry.

SUBSTANCE: proposed device is designed for use at simultaneous separate production of oil from two beds by means of deep-well sucker-rod pump units. It contains plunger with cylinder, suction and delivery valves, side valve to take off liquid from upper bed, packer separating said beds and arranged lower than pump intake. Plunger of pump is provided with smaller diameter plunger arranged lower and furnished with delivery valve. Side valve is located in lower end face part of larger size cylinder. Additional delivery valve arranged in upper part of smaller diameter plunger communicates with space formed by outer surface of smaller diameter plunger and larger diameter cylinder of pump.

EFFECT: provision of operation of plant irrespective of location of bed with larger formation pressure.

1 dwg

Description

The present invention relates to technical means for simultaneous and separate oil production from two reservoirs using sucker rod pumping units.

The closest set of essential features is a borehole sucker-rod pumping unit containing a cylinder with suction and discharge valves, an outer pipe forming a sealed chamber with a pump cylinder and having a side channel for entering the oil phase and an upper poppet valve, a shank with a valve in the upper area for receiving water phase / Aut. St. 1236161, IPC F04B 47/02, 1984 /.

Closest to the proposed invention is a rod installation / RF patent No. 2221136, IPC F04B 47/02 /, which allows you to select oil from two layers using an additional side pump valve, an opening in the pump cylinder, a packer installed below the pump inlet valve. The installation has a significant drawback, namely, that it has operability only in the case of an overhead formation with high pressure. Otherwise, after the plunger passes through the side opening, fluid from the lower reservoir will continue to flow into the pump cylinder due to the greater pressure. The side valve will be closed and no liquid will flow from the upper layer into the pump cylinder.

The aim of the invention is to ensure the independence of the installation from the location of the formation with high reservoir pressure.

This goal is achieved by the fact that in the known device comprising a sucker rod pump with a plunger, a side valve for withdrawing fluid from the upper formation, a packer separating the layers and located below the pump intake, the pump plunger is equipped with a lower diameter plunger located below, having a discharge valve, a side valve placed in the lower end of the larger cylinder, and in the upper part of the smaller diameter plunger there is an additional discharge valve in communication with the space formed by the outer the surface of the plunger of small diameter and the pump cylinder of larger diameter.

The drawing shows a diagram of the proposed device.

A pumping unit was lowered into the well on the tubing string 1, consisting of articulated cylinders of large 2 and small 3 diameters, articulated plungers of large 4 and small 5 diameters, suction 6 and pressure 7 valves, side 8 and additional pressure 9 valves, pipe 10 with a packer 11 separating the layers A and B. The side valve 8 has an opening 12 in the lower end part of the larger diameter pump.

The operation of the installation is as follows. Formation fluid from the lower reservoir B is sucked through valve 6 and injected through valve 7 and the internal cavity into the tubing string 1.

When the plungers move upward, the volume of the cavity formed by the plunger 5 and pump cylinder 2 increases. Therefore, fluid from the reservoir A will be sucked into this cavity through the side valve 8 and the hole 12. When the plungers move downward, the volume of the cavity decreases, and the reservoir fluid is forced out tubing string through an optional discharge valve 9.

Changing the ratio of the diameters of the plungers 4 and 5 of the pumping unit achieves the required ratio of liquid withdrawals from formations A and B.

Thus, the technical advantage of the proposed device is that the pumping of formation fluids from formations A and B is carried out by independent plunger systems and does not depend on which formation has the highest energy.

Claims (1)

A downhole sucker-rod pumping unit for simultaneous and separate oil production from two reservoirs, including a plunger with a cylinder, suction and discharge valves, a packer separating the upper and lower reservoirs and located below the pump intake, a side valve for withdrawing fluid from the upper reservoir, characterized in that the pump plunger is equipped with a lower diameter plunger located below, having a discharge valve, a side valve is located in the lower end of the cylinder of a larger diameter, and in the upper part of the smaller plunger ametra placed extra pressure valve, communicated with the space formed by the outer surface of the smaller diameter of the plunger and the cylinder of larger diameter pump.