Integrated drainage and gas recovery system for low pressure and low production wells

Abstract

The invention discloses a comprehensive drainage and gas recovery system for low-pressure and low-yield wells, and belongs to the technical field of natural gas exploitation equipment design and manufacture. A comprehensive drainage and gas production system for low-pressure and low-production wells is provided, which can effectively input the drainage and gas production medium into the liquid accumulation section below the gas production surface, so as to effectively improve the effect of drainage and gas production. The integrated drainage and gas recovery system includes gas production tubing that can extend into the gas production surface of the wellbore and an oil casing that is sleeved outside the gas production tubing, and also includes a multifunctional delivery device and a packer, the end of which can be extended into The multi-functional conveying device below the gas production surface of the wellbore is sheathed in the gas production tubing, and the gap between the gas production tubing and the oil casing at the end of the wellbore gas production surface is sealed by the packer The drainage and gas production medium used to remove the liquid accumulation below the wellbore gas production surface of the low-pressure low-production well is directly input into the liquid accumulation below the gas production surface through the multifunctional conveying device with the cooperation of the gas production tubing.

Description

technical field [0001] The invention relates to a comprehensive drainage and gas recovery system, in particular to a comprehensive drainage and gas recovery system for low-pressure and low-yield wells, and belongs to the technical field of natural gas exploitation equipment design and manufacture. Background technique [0002] Most of the low-production and low-pressure gas wells at home and abroad are in the early stage of production, especially in the middle and late stages, because hydrocarbon condensate or formation water often flow into the bottom of the well. When it is small, the water will be completely carried to the surface by the air flow. With the progress of the mining process, the energy of the formation naturally weakens, and the gas-liquid flow rate also decreases, which makes the liquid-carrying capacity of the gas worse and worse, and cannot effectively bring the bottomhole liquid to the surface in time, resulting in a gradual increase in wellbore fluid acc...

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Problems solved by technology

[0003] At present, the foam drainage gas recovery technology is widely used at home and abroad to solve the problem of fluid accumulation in the wellbore of low-pressure and low-production wells with water gas reservoirs, and to improve the recovery factor. Filling, can not effectively reach the wellbore liquid accumulation section, seriously affecting the drainage effect, it is urgent to explore a new drainage and gas recovery method to solve the problems faced

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