Inadaptability of high-rank CBM development engineering and its solution idea

It is common in the process of coalbed methane (CBM) development that the change of regional reservoirs is complex and the adaptability of engineering is diverse in different areas. To deal with these problems, the application results of engineering which was previously used for CBM development were analyzed based on the lateral variation characteristics of high-rank coal reservoirs in the Qinshui Basin. Then, based on abundant laboratory tests and field application, a complete set of CBM development engineering idea with the dredge development concept as the core was proposed. And a series of technologies with the controllable horizontal well and the dredge coal reservoir stimulation technology as the main parts were developed. The test results of field application are remarkable and CBM exploitation benefit is improved effectively. The drilling period of controllable horizontal wells drops by 20%-30%, the drilling cost declines by 30%-50%, and the average single-well gas production rate after vertical wells are stimulated in the dredge pattern rises by over 500 m³/d. The research results provide the technical support for the high-efficiency CBM development in the future.