Device and method for partial pressure commingling production of deep coal bed gas and shallow low-pressure tight gas

Abstract

The invention discloses a device and method for partial pressure commingling production of deep coal bed gas and shallow low-pressure tight gas. The device comprises fracturing pipes, connecting shaft shells, sealing expansion components, pressure monitors and commingling production devices; each fracturing pipe is of a multi-section spliced structure; the sealing expansion components are installed at the ends of the adjacent fracturing pipes; the connecting shaft shells are installed on the circular faces, close to the outer sides, of the sealing expansion components; the pressure monitors are installed on the side ring faces of the connecting shaft shells; the commingling production devices are installed between the adjacent connecting shaft shells; the commingling production devices are used for fracturing rock stratums where the commingling production devices are located; and the sealing expansion components and the pressure monitors are respectively used for carrying out sealing and pressure detection on a space layer cavity in which the commingling production devices are positioned.

Description

technical field [0001] The invention relates to the technical field of coalbed methane mining, in particular to a device and method for partial pressure combined production of deep coalbed methane and shallow low-pressure tight gas. Background technique [0002] Tight sandstone gas is referred to as tight gas for short. The natural gas distributed in tight sandstone refers to the reservoir rock where the tight gas is located with low porosity (<10%), low permeability, low gas saturation (<60%), and low water saturation. High (>40%), natural gas in sandstone formations where gas flows more slowly in sandstone formations. The exploitation of tight gas requires the use of fracturing technology, which is expensive to exploit and is sometimes classified as unconventional natural gas. The development and utilization of unconventional natural gas resources is not only a powerful supplement to the shortage of conventional natural gas resources, but also an economic replace...

AI Technical Summary

Problems solved by technology

At present, in the existing devices for coalbed methane partial pressure and co-production, it is not possible to fully fracture different rock formations, and after fracturing the rock formations, the cracks produced are narrow in width and small in number, and cannot fully fracture the coal seam. Exhaust gas, low collection efficiency, waste of resources

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