Industrialized development method for coal district coal-bed gas wells

Abstract

The invention belongs to the field of coal-bed gas development geology and engineering and non-conventional gas development engineering and geological engineering, and provides an industrialized development method for coal district coal-bed gas wells so as to enable singular and dispersive drilling, fracturing, discharging and mining and gathering and transportation operation modes for coal district coal-bed gas development to be developed to modular layout-centralized operation for the coal district coal-bed gas wells. The method includes the steps that coal-bed gas well pattern design is carried out on a to-be-mined coal district, well pattern drill sites are arranged along panel main roadways, L-shaped wells are adopted, and drilling along working face coal pillars is conducted for horizontal wells; the coal-bed gas wells are arranged in a modularized mode, horizontal wells are arranged along the left and right sides of stope face coal pillars in each drill site, and for multiple coal beds, horizontal wells are drilled along coal-bed coal pillars of the working face, so that the modular layout purpose of the coal-bed gas wells is achieved; and a plurality of coal-bed gas wells are constructed at the same time in a centralized mode by adopting the operation mode that multiple technical processes including drilling, fracturing, discharge and mining and gathering and transportation are integrated. Accordingly, the industrialized development purpose of the coal district coal-bed gas is achieved.

Description

technical field [0001] The invention belongs to the fields of coalbed methane development geology and engineering, unconventional gas development engineering and geological engineering, and specifically relates to a factory-style development method for coalbed methane wells in coal mining areas. Background technique [0002] The geological structure of my country's coal fields is complex, and there are many high-gas mines and coal and gas outburst mines. With the increase of coal mining depth, the problem of coal seam gas is becoming more and more serious. Therefore, the development of coalbed methane before or during coal mining is an effective way to solve the problem of coal mine gas safety. [0003] In the 1970s, some coal mine owners in the United States tried to use oil and gas extraction technology for gas drainage in order to reduce coal mine gas disasters. After a period of experiments, they succeeded. Afterwards, the ground commercial development of coalbed methan...

AI Technical Summary

Problems solved by technology

At present, the output of coalbed methane wells in coal mining areas is generally low, unstable, and decays quickly. At present, they are facing many major development key technical problems. High density, difficult pipeline network collection and transportation, low mining efficiency, and difficult commercial operation; and the supporting technology for coalbed methane development in coal mining areas is not yet perfect, the promotion area is limited, and development benefits need to be improved

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