欠平衡钻井技术在煤层气勘探开发中的应用

Application of the Under-balance Driiling Technology in CBM Exploration and Development

摘要:

分析了当前国内外开发利用煤层气的现状;指出中国煤层气藏具有低压低渗、难脱附、驱动力不足和构造煤发育等重要特殊性,这种特殊性使常规煤层气开发技术有很大的局限性;提出了适合低压低渗煤层气藏特点的开发技术系列,包括欠平衡钻井与洞穴完井技术和欠平衡钻多分支水平井与洞穴技术.

Abstract:

The present situation of CBM development around the world is analyzed. It is pointed out that CBM reservoirs in China are featured with low pressure, low permeability, poor desorptionability, insufficient drive power and regionally appeared pulverized coal lenses etc., which makes the commonly used CBM development technology severely limited in the development of CBM in China. A series of development technologies which are suitable for low pressure and low permeability of CBM resources in China are presented, including under-balance drilling and cavity completion technology, and multi-lateral horizontal well and cavity completion technology.