Volume fracturing treatment method for coal layer

Abstract

The invention relates to the technical field of coal bed gas exploitation, in particular to a volume fracturing treatment method for a coal layer. The method includes the steps that geological featureinformation of a target area is acquired, and a coal reservoir hydraulic fracturing fracture propagation model is established on the basis of destination geological feature information; the interaction of hydraulic fractures and natural joints is simulated based on the coal reservoir hydraulic fracturing fracture propagation model, and a simulation result is obtained; factors influencing the interaction of hydraulic fractures and natural joints are analyzed according to the simulation result, various factors are evaluated, and an evaluation result is obtained; and the volume fracturing process and construction parameters of a construction site are optimized according to the evaluation result and the coal reservoir hydraulic fracturing fracture propagation model. In this way, the efficiency of coal bed gas exploitation is improved by optimizing the volume fracturing process and the construction parameters.

Description

technical field [0001] The invention relates to the technical field of coal bed gas exploitation, in particular to a volume fracturing treatment method of coal seams. Background technique [0002] In recent years, my country has abundant reserves of coalbed methane resources, and coalbed methane is also called gas, which refers to methane as the main component in coal seams, and most of the coalbed methane is adsorbed on the surface of coal matrix particles, and a small part of coalbed methane is free In addition, coalbed methane is also called unconventional natural gas, which is a kind of hydrocarbon gas and an associated mineral resource of coal. Its development and utilization can obtain great economic benefits. Clean, high-quality energy and chemical raw materials that have risen internationally in the past ten years are of great significance to coal mine disaster reduction, protection of the atmospheric environment, and improvement of energy consumption structure. [00...

AI Technical Summary

Problems solved by technology

[0003] Coal reservoirs contain a large number of joints and natural micro-cracks, which need to be treated by fracturing. However, in the prior art, there is a large difference in construction pressure during hydraulic fracturing, and there is a risk of adding sand to wells with high fracture pressure. After the wells with low fracture pressure are put into production due to blockage, the water volume is large and the gas volume is small

Some of the wells are difficult to construct, and the fracture pressure exceeds 45MPa. After many attempts, they have not been successfully fractured. There are also some wells whose fracture pressure is less than 20MPa. After construction, the water gushes seriously and cannot be put into production.

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