RU2049229C1 - Downhole device for separation of gas from fluid - Google Patents

Abstract

FIELD: well operation. SUBSTANCE: installed in body with slotted radial channels are suction pipe for supply of fluid to pump intake, gas discharge unit and regulating float valves. Float valves regulate admission of gas to pump intake by lower float, and admission of fluid to zone of gas separation from fluid by means of upper float. Gas discharge unit has vertical pipes with holes for drop trapping. EFFECT: higher efficiency. 3 dwg

Description

 The invention relates to the oil and gas industry, and in particular to means to combat the harmful effects of gas during deep-well pumping of oil wells.

A well-known device for separating gas from a liquid, comprising a housing with radial channels for the passage of a gas-liquid mixture, a suction pipe for supplying liquid to receive a deep pump [1]
A disadvantage of the known device is the low separation ability of the device due to the fact that the main volume of dissolved gas enters the intake of the deep pump together with the liquid and, creating gas pads, disrupts its normal operation.

It is also known a device for separating gas from a liquid in a well, comprising a housing (main pipe) with radial channels for transferring the gas-liquid mixture, a suction pipe (additional pipe) concentrically placed in the housing for supplying liquid to the pump intake, a gas outlet installed in the upper part Housings, control float valve, mounted with limited axial movement [2]
A disadvantage of the known device is that it has a low separation ability with high gas factors (above 200 m ³ / m ³ ).

 The purpose of the invention is to increase the separation ability of the device at high gas factors.

 The goal is achieved by the fact that the device is equipped with two floats installed in the upper and lower parts of the casing with the possibility of blocking the gas access to the pump intake with a lower float and blocking the liquid access to the region of gas separation from the liquid by the upper float. In addition, the casing in the middle part has a turbine inlet for changing the direction of flow of the gas-liquid mixture, and the gas outlet in the upper part is made tubular using the principle of droplet collection.

 Figure 1 shows a device for separating gas from a liquid in a well; figure 2 section aa in figure 1; figure 3 section BB in figure 1.

 A downhole device for separating gas from a liquid consists of a housing 1 with a turbine inlet for changing the direction of flow of a gas-liquid mixture 2, a suction pipe 3 for supplying liquid to a downhole pump, a perforated filter 4, and a lower float 5 for blocking gas access to the pump while lowering the liquid level below the critical upper float 6 to block access to the liquid in the gas outlet unit 7.

 The gas outlet unit 7 is made tubular with lateral branches for drying gas from the liquid, and the upper float 6, blocking the exhaust pipes at the moment of increasing the level inside the body 1, allows to increase the degree of gas separation in the annulus of the well, which prevents foam formation in the wellbore.

 The device operates as follows.

 During the descent of the borehole device together with the downhole pump to the required depth, the body is filled with the fluid contained in the wellbore. After the pump is put into operation, as it draws liquid from the lower part of the housing 1, the liquid level of the wellbore gradually decreases and the gas-liquid mixture from the reservoir begins to flow. The gas-liquid mixture from the wellbore begins to enter the body 1 through the turbine inlet of the change in the direction of flow of the mixture 2, from where the gas rises to the upper part of the body 1 and exits through the node 7 into the annulus of the well. The liquid flows down the annular space of the housing 1, through a perforated filter 4 it enters the suction pipe 3 and is sent to receive a deep pump. When the liquid level drops below a critical value, the lower float partially blocks the openings, reducing the flow of liquid into the pump intake. The flow of liquid stops when the gas approaches the perforated filter, the submersible pump is disconnected from reducing the load on the rod.

 Thus, along the path of the gas-liquid mixture, gas is separated at the liquid level, from where the latter is sent to the lower part of the housing 1 and to the pump intake, and the gas is taken up.

 The use of the wellbore as a separator and the presence of two control floats can increase the separation ability of the device with high gas factors.

Claims (1)

 A BOREHOLE DEVICE FOR GAS SEPARATION FROM LIQUID, comprising a housing with radial channels for the passage of a gas-liquid mixture, a suction pipe concentrically placed in the housing for supplying liquid to the pump intake, a gas outlet assembly installed in the upper part of the housing, and a control float valve installed with the possibility of limited axial movement, characterized in that, in order to prevent hydrate formation in the barrel, it is equipped with an additional control float valve, chippers and limited The gas outlet assembly is made in the form of vertical tubes with side openings mounted in a housing above the radial channels, an additional control float valve is installed between the limiter and the gas outlet assembly with the possibility of overlapping the vertical tubes of the gas outlet assembly in its upper position and interacting with the limiter in its lower position, while the bumpers are installed in the housing opposite the radial channels, and the radial channels are made in the form of vertical slots.

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