RU2713062C1 - Device for removal of gas from annular space of oil production well - Google Patents

Abstract

FIELD: oil industry.SUBSTANCE: invention relates to oil industry and can be used for bleeding of annular by-produced gas from an oil well. Device includes engine and compressor. Compressor suction pipe is connected with annular space of production well. Discharge branch pipe is connected with discharge pipeline. Compressor is made up of centrifugal pump. Its shaft is connected to the motor. Engine is made in the form of turbine. Its blades are fitted on the shaft. At that turbine inlet is communicated with steam generator while its outlet is communicated with injection well for injection of steam into formation. At that centrifugal pump and turbine can operate at temperatures higher than 75 °C.EFFECT: technical result is possibility of gas removal from annular space of oil well at high temperatures.1 cl, 1 dwg

Description

The invention relates to the oil industry and may find application in etching annular associated gas from an oil well.

It is known that an increase in pressure of associated gas in the annulus of a producing well leads to a decrease in the dynamic level of the fluid. With a significant increase in pressure, it can lead to a breakdown in the supply of pumps due to the ingress of gas into them. In order to prevent disruption of the pump operation, the annular space of the well is communicated with a flow line at the wellhead through a check valve.

The well-known "Wellhead equipment of pumping oil wells" (patent RU No. 2309240, IPC E21B 33/03, published on 10/27/2007 in Bull. No. 30), containing a faceplate mounted on the flange of the production string with an eccentrically located coupling part, designed for connection under the injection a line with a tubing string on one side and under the tee with a wellhead seal, radial and vertical holes in the flange of the faceplate connected to the annulus and provided for installation of an accelerating device, as well as for working with research instruments, respectively, characterized in that the faceplate has a safety valve located in the radial hole made in the flange part of the faceplate with the possibility of communication with the annulus and the discharge line through channels laid in the body, respectively , flange and coupling parts of the faceplate, and the safety valve is made of a seat and a valve spring-loaded under the seat, installed with the possibility of maintaining it in working position and shutdown by clamping screw.

Also known is the “Wellhead check valve of an oil, oil and gas well” (patent RU No. 2367775, IPC E21B 34/02, E21B 33/03, published on September 20, 2009 in Bull. No. 26), characterized in that it includes a hollow body equipped with the inlet pipe of the main component - formation fluid, mainly oil, oil and gas mixture and the inlet pipe of the discharge component, mainly annular gas, as well as the discharge pipe for the mixture of the main and discharge component, an indoor unit mounted in the check valve body with a body in the form of Akana with at least one hole or channel in its side wall for annular gas removal, mounted at an angle to the formation fluid flow vector and intersecting it with the formation of an annular cavity communicating with the reservoir fluid with the inner surface of the walls of the check valve body; and outlet pipes, wherein the check valve also includes at least one locking member located in the cup having a movable and fixed part and dividing its cavity into an inlet in front of the locking ganom and a worker behind the shutoff member in the direction of the annular gas flow, in communication with the reservoir fluid flow through the said hole or channel in the side wall of the cup located in the radial volume sector of the viewing angle of the said wall from the axial point of the cross section of the outlet mouth of the outlet pipe of the mixture of reservoir fluid and the annulus gas, and the locking element is mounted in the glass, at least with a contour support of its fixed part on the said side wall of the glass of the internal block of the inverse to Apana.

However, the use of both of the above devices to implement the method of bleeding annular associated gas produced is ineffective at elevated liquid pressures in the flow line. Since the gas pressure does not overcome the pressure in the flow line, which leads to a decrease in the dynamic level of the liquid, and to a failure of the pump.

It is also known “Device for removing gas from the annulus of an oil well” (patent RU No. 2567571, IPC E21B 43/00, published on November 10, 2015 in Bull. No. 31), including a pump cylinder for entering and leaving the pumped liquid, a plunger in the cylinder non-return valves located on both sides of the cylinder and communicating the cylinder cavity with the annulus of the well, characterized in that the plunger in the cylinder placed on the day surface of the well is made in the form of two pistons connected by a rod passing through the cylinder gland, on both sides to The lines to enter and exit the produced products are connected to the cylinder through the flow switch, one of which is connected to the flow collector of the well to the discontinuous valve in the manifold, and the other after it, gas lines from the annulus are connected to both ends of the cylinder through one pair of check valves, and through another pair of valves, the ends of the cylinder are connected to the discharge manifold after an explosive valve, and at the ends of the cylinder there are electrical contacts connected to the electromagnetic actuator of the switch body flow.

The disadvantage of this installation is the inability to operate the equipment at high temperatures and the need for individual selection of equipment for specific operating conditions of the producing well.

Closest to the proposed invention, in technical essence, is the "Oil Production System" (patent RU No. 2102584, IPC E21B 43/00, publ. 01.20.1998 in Bull. No. 2), including a submersible pump with a drive, a well, a compressor, the suction pipe of which is connected to the annulus of the well, the inlet and outlet pipelines of liquid and gas, characterized in that the suction pipe of the compressor is connected by a common manifold to the annulus of two or more wells, and at least one of the wells is connected to a common reservoir rum and flow compressor gas line through pressure regulators.

The disadvantage of this system is the narrow scope due to the inability to operate the equipment at high temperatures (more than 75 ° C), as well as the difficulty in setting up and maintenance due to the need for individual selection of equipment for specific working conditions of production wells.

The technical task of the invention is the creation of a device for removing gas from the annulus of an oil well operating at high temperatures (more than 75 ° C), while being easy to tune and maintain.

The technical problem is solved by a device for removing gas from the annulus of an oil producing well, including an engine and a compressor, the suction pipe of which is in communication with the annular space of the producing well, and the discharge pipe is connected to a discharge pipe.

What is new is that the compressor is made in the form of a centrifugal pump, the shaft of which is connected to an engine made in the form of a turbine, the blades of which are mounted on the shaft, while the turbine inlet is in communication with a steam generator, and the outlet with an injection well for injecting steam into the formation.

The drawing shows a diagram of a device in section.

A device for removing gas from the annular space of an oil producing well (not shown) includes an engine 1 and a compressor 2, the suction pipe 3 of which is in communication with the annular space (not shown) of the producing well, and the discharge pipe 4 with a discharge pipe (not shown). The compressor 2 is made in the form of a centrifugal pump, the shaft 5 of which is connected to the engine 1. The engine 1 is made in the form of a turbine, the blades 6 of which are mounted on the shaft 5. The input 7 of the turbine 1 is in communication with a steam generator (not shown), and the output 8 is connected to an injection well (not shown) for injecting steam into the formation (not shown).

The device operates as follows.

Steam is pumped from the steam generator into the injection well, which, passing under pressure from the inlet 7 to the outlet 8 of the engine 1, rotates the blades 6 of the turbine 1 together with the shaft 5. The shaft 5 in turn rotates the impeller 9 of the compressor 2, which takes gas from the annulus of the producing well through the suction pipe 3 and pumps it into the outlet pipe through the discharge pipe 4.

The proposed device for removing gas from the annulus of an oil producing well is easy to set up and maintain, since it has a small number of parts and can work at high temperatures (more than 75 ° C) due to the fact that the turbine and centrifugal pump tolerate high temperature.

Claims (1)

A device for removing gas from the annular space of an oil producing well, including an engine and a compressor, the suction pipe of which is connected to the annular space of the producing well, and the discharge pipe is connected to a discharge pipe, characterized in that the compressor is in the form of a centrifugal pump, the shaft of which is connected to the engine made in the form of a turbine, the blades of which are mounted on the shaft, while the turbine inlet is in communication with the steam generator, and the output is with an injection well for injecting steam into the formation, and centrifugal pump and turbine are made with the ability to work at temperatures above 75 ° C.

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