A gas recovery device and method for horizontal wells in unconventional gas reservoirs by gas lift and drainage

Abstract

The invention relates to an unconventional gas reservoir horizontal well gas lift drainage gas recovery device, which comprises multiple casings (1), multiple oil pipes (2), compressors (4), booster main pipes (5), multiple booster tubes Compression branch pipe (3) and control main engine; an oil pipe (2) and booster branch pipe (3) are inserted into each casing (1), and a ring is formed between the oil pipe (2) and the inner wall of the casing (1) empty, the multiple booster branch pipes (3) are connected to the compressor (4) through the booster main pipe (5), a pressure sensor is set in each annular space, and each oil pipe (2) is connected to the booster The branch pipes (3) are all provided with electromagnetic valves, the signal output end of the pressure sensor is electrically connected to the control host, and the signal output end of the control host is electrically connected to a plurality of electromagnetic valves. The control host of the present invention performs cyclic pressurization on each casing (1) to ensure the gas production of multiple gas wells on one platform, reduce production costs and improve production efficiency, and at the same time ease the gradual decrease of formation pressure.

Description

technical field [0001] The invention relates to the technical field of natural gas drainage and gas recovery, in particular to a gas lift drainage gas recovery device and method for horizontal wells in unconventional gas reservoirs. Background technique [0002] my country has abundant reserves of unconventional natural gas resources. If they can be developed reasonably and effectively, unconventional natural gas will provide a very stable energy guarantee for the sustainable development of my country's national economy. Compared with conventional natural gas, unconventional natural gas reserves, including shale gas, are higher, but unconventional natural gas needs to be volume-fractured to obtain industrial gas flow, in order to obtain industrial value mining. [0003] Conventional natural gas wells refer to gas wells with good formation properties and high permeability. Natural gas and shale gas in rocks in such gas wells can easily penetrate into the well. Unconventional...

AI Technical Summary

Problems solved by technology

However, the gas production efficiency in conventional gas wells is stable, and the gas lift and drainage can be evacuated once. There are 3-6 gas wells on one platform, and the distance between each gas well is 5-10 meters. After gas lift and drainage of a gas well, it is necessary to manually connect the next gas well, which is inefficient and requires a lot of manual garrison.

The cost of artificial garrison is high, and in the process of formation gas production, the formation pressure will gradually decrease

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