Coal bed gas U-shaped well staged fracturing exploitation technology

Abstract

The invention relates to the technical field of coal bed gas exploration and development, in particular to a coal bed gas U-shaped well staged fracturing exploitation technology. The technology includes the steps of firstly, performing U-shaped well completion; secondly, performing U-shaped horizontal well horizontal section staged hydraulic spraying and sand fracturing; thirdly, communicating the U-shaped horizontal well with a vertical shaft again; fourthly, pumping and exploiting. The technology has the advantages that beneficial well sections can be selected, compaction zone pollution can be eliminated, crack turning can be avoided, crack extension can be guaranteed, crack with sufficient width can be achieved, stratum crack initiation pressure is lowered, coal bed modification volume is increased, coal bed permeability is increased effectively, oil draining area is increased, shaft seepage velocity is increased, output is increased, post exploitation process is simplified, operation cost is lowered, and coal bed gas exploitation effect is increased effectively.

Description

Technical field: [0001] The invention relates to the technical field of coalbed methane exploration and development, in particular to a coalbed methane U-shaped well staged fracturing mining technology. Background technique: [0002] High-order anthracite is affected by tectonic stress, and the original structure is destroyed, forming crushed coal and mylonitic coal. The permeability of coal is extremely poor, and the coal powder is developed. The drainage channel is easy to be blocked, and the drainage equipment is affected, resulting in a short drainage cycle. and other adverse effects. For areas where structural coal is developed, the traditional surface vertical well development technology can no longer achieve good results. The main disadvantages are: (1) Open hole wells and conventional perforated wells are easy to form compaction zone pollution, and the diversion of fracturing fractures in the near-wellbore area affects the amount of liquid flowing from the formation...

AI Technical Summary

Problems solved by technology

It overcomes the disadvantages that the existing vertical well fracturing cannot select favorable well intervals, the compaction zone is polluted, the fracturing fractures turn around in the near wellbore area, the fractures are not wide enough, the single main fracture cannot fully extend far away from the formation, and the formation fracture initiation pressure is high.

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