Unconventional gas reservoir horizontal well gas lift water draining gas production device and method

Abstract

The invention relates to an unconventional gas reservoir horizontal well gas lift water draining gas production device. The device comprises multiple casings (1), multiple oil pipes (2), a compressor(4), a pressurizing main pipe (5), multiple pressurizing branch pipes (3) and a control main unit. One oil pipe (2) and one pressurizing branch pipe (3) are inserted in each casing (1), an annulus isformed between each oil pipe (2) and the inner wall of the corresponding casing (1), the pressurizing branch pipes (3) are connected with the compressor (4) through the pressurizing main pipe (5), a pressure sensor is mounted in each annulus, electromagnetic valves are mounted on each oil pipe (2) and each pressurizing branch pipe (3), the signal output ends of the pressure sensors are electrically connected with the control main unit, and the signal output end of the control main unit is electrically connected with multiple electromagnetic valves. The control main unit is used for carrying out circular pressurizing on the casings (1), the gas production rate of multiple gas wells on one platform can be ensured, the production cost is reduced, production efficiency can be improved, and meanwhile, progressive decreasing of formation pressure can be relieved.

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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