RU2243415C2 - Oil production plant - Google Patents

Abstract

FIELD: oil producing industry.

SUBSTANCE: invention can be used in wells with high content of gas and mechanical impurities for pumping out oil with submersible pumps. Said well oil production plant includes auxiliary tube with end insulating device lowered into well and pump lift installed inside. Holes are made in upper part of auxiliary tube under flowing level to communicate with well annulus. Spaces of lift and auxiliary tube at surface communicate with vacuum compressor to withdraw gas. Invention is aimed at enlarging operating capabilities of submersible pumps handling liquids containing gases and mechanical impurities.

EFFECT: improved reliability and increase service life of plant.

2 cl, 3 dwg

Description

The invention relates to the field of oil production and can be used in the operation of wells with a high content of gas and solids by submersible pumps.

A known installation comprising a pump installed in a production casing of a well equipped with a packer, on a casing of pump pipes, and an additional casing located coaxially with the latter, has an opening in which a membrane is installed connected with a flow switch for communicating annular cavities with a pump inlet (RU 213 8622 C1, 09/27/1999).

The disadvantages of the known installation should include a narrow scope - only for the selection of liquid that does not contain gas.

A well-known installation for the operation of wells, including the auxiliary pipe lowered into the well and the production lift installed inside the auxiliary pipe with an end isolation device (SU 1211460 A1, 02.15.1986).

A disadvantage of the known installation is that the cavity of the auxiliary pipe is used to accommodate a heated high thermal conductivity of the medium that transfers heat to the produced fluid to prevent the formation of deposits, and as a consequence, a narrow scope for the selection of a liquid that does not contain gas.

Closest to the invention is an installation for oil production from wells, including an auxiliary pipe lowered into the well with an end isolation device and an internal production pump elevator installed, with holes for communicating with the annulus of the well (DE) underneath the dynamic fluid level in the upper part of the auxiliary pipe 543770 A, 02/09/1932).

This installation ensures the removal of part of the gas and mechanical impurities, bypassing the pump, however, part of the gas still enters the pump inlet.

The problem to which the invention is directed, is to expand the possibilities of using submersible pumps when working with gassed liquid.

The technical result that can be obtained by carrying out the invention is to increase the operational reliability and durability of submersible pumps.

The technical result is achieved by the fact that in the installation for oil production from wells, including an auxiliary pipe lowered into the well with an end isolation device and a production pump hoist installed inside, while in the upper part of the auxiliary pipe, holes are made under the dynamic fluid level for communication with the annulus of the well , according to the invention, the space of the lift and auxiliary pipe on the surface are in communication with a vacuum compressor for gas extraction.

Improving operational reliability and durability is also achieved due to the fact that above the receiving grid of the pump a casing is fixed, lowering below the submersible motor.

Figure 1 shows the installation for oil production from wells with a lift equipped with a rodless pump with a submersible motor. Figure 2 - node I in figure 1, figure 3 - node II in figure 1.

Installation for oil production from wells includes a production pump lift 1, an auxiliary pipe 2 with an end isolation device 3 and holes 4 located below the dynamic level Nd, lowered into the well 5, a vacuum compressor 6 communicated on the surface by pipes 7 with annular spaces of the lift 1 and auxiliary pipe 2, the casing 8, secured with clamps 9 above the receiving grid 10 of the pump 11 and lowering below the submersible motor 12 to improve its heat transfer.

Installation for oil from wells works as follows. The reservoir fluid under the influence of reservoir pressure enters the annulus of the auxiliary pipe 2, and through the holes 4 it falls down the annulus of the elevator 1, flows around the casing 8 from the outside, washes the submersible motor 12, cooling it, and through the intake grid 10 enters the pump 11 and then to the surface. As the fluid rises along the annulus of the auxiliary pipe 2, the hydrostatic pressure of the liquid column decreases, and the dissolved gas rises and is released above the dynamic level Nd in the annular space of the auxiliary pipe 2. The remaining unreleased gas entering the auxiliary pipe along with the formation fluid through openings 4 pipe 2, rises along it, since it is lighter than liquid and cannot be captured by the flow of liquid going down to pump 11. At the same time, formation degassing occurs liquid before it arrives at the pump 11. The intensity of gas evolution is promoted by the vacuum in the annular cavities above the dynamic level created by the vacuum compressor 6 through the pipes 7. The sampled gas is sent to the collection manifold (not shown in the diagram).

Since the rate of rise of the liquid through the annulus of the auxiliary pipe 2 is low, particles of mechanical impurities present in the liquid are not carried out by the flow, and, consequently, do not enter the pump 11 in the future, which will reduce the likelihood of its failure due to abrasive-mechanical wear.

Claims (2)

1. Installation for oil production from wells, including an auxiliary pipe lowered into the well with an end isolation device and a production pump hoist installed inside, and openings for communication with the annular space of the well are made in the upper part of the auxiliary pipe under the dynamic fluid level, characterized in that the space of the elevator and auxiliary pipe on the surface are in communication with a vacuum compressor for gas extraction. 2. Installation according to claim 1, characterized in that a casing is fixed above the intake grid of the pump, lowering below the submersible motor.

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