Downhole same-well injection-production gas-liquid separator

Abstract

The invention provides a downhole same-well injection-production gas-liquid separator. The gas-liquid separator is combined with an electric submersible pump, an overhead type electric submersible pump drainage gas production lifting system is adopted, and downhole separation of gas-liquid mixed flow can be achieved. The downhole same-well injection-production gas-liquid separator is characterized in that the gas-liquid separator is further provided with a gas-liquid separator body, a gas-liquid separating cover and a gas-liquid outer spiral body; the gas-liquid separator body is located in a cavity body surrounded by an upper housing, a liquid inlet housing and a lower housing, and formed in the mode that a gas-liquid separating body upper transmission shaft, a gas-liquid separating guide section, a gas-liquid separating body reverse cone section and a gas-liquid separating body lower transmission shaft are connected in sequence from top to bottom; a guide vane is welded outside the gas-liquid separating guide section; a gas inlet is formed in the gas-liquid separating body reverse cone section, and the outlet of a gas hole channel is located in the inner cavity of the upper housing; the gas-liquid separating cover is a hollow inverted frustum, and the gas-liquid outer spiral body is also the hollow inverted frustum.

Description

technical field [0001] The invention relates to a downhole gas-liquid separation device used in the field of natural gas development and used for the production and injection of a submersible electric pump in the same well. Background technique [0002] During the production process of gas wells, the phenomenon of simultaneous production of gas and water is easy to occur. The water production of gas wells will cause liquid accumulation in gas wells, which will seriously damage the production of gas wells, and eventually cause the gas wells to stop production due to water flooding. For the problem of liquid accumulation in gas wells, drainage gas recovery technology is usually used. The electric submersible pump drainage and gas recovery lifting system has the advantages of large displacement range, high lift and convenient management. At present, the electric submersible pump drainage and gas recovery lifting system discharges the separated liquid to the ground for treatmen...

AI Technical Summary

Problems solved by technology

However, when the electric submersible pump drainage and gas recovery lifting system is applied to a liquid-loaded gas well with a high gas-liquid ratio, due to the influence of the free gas contained in the well fluid on the lifting capacity of the multi-stage centrifugal pump, the phenomenon of air lock will occur. extreme phenomenon

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