适合中国煤层气藏特点的开发技术

分析了常规煤层气开发技术的特点,认为常规技术对中国煤层气藏开发有很大的局限性。因为中国煤层气藏具有低渗透、难脱附、驱动力不足和构造煤发育等6个方面的重要特性,所以要求其相应的开发技术要在提高导流能力、建立有效压差、加快脱附速度、利用应力释放场、规避构造煤等5个方面给予配套。为此,设计了适合中国煤层气藏特点的3个开发技术系列,包括:煤矿采动影响区特殊采气技术,多井眼多分支水平井与洞穴技术,常规技术。

NEW TECHNOLOGY SERIES FAVORABLE TO DEVELOP COAL BED METHANE RESERVOIRS

The commonly used technology for exploitation of coal bed methane (CBM) is not so working for CBM reservoir in China.Six particularities,including poor permeability,low reservoir pressure,poor desorptionability,regionally appeared pulverized coal lenses,etc.,are summarized to characterize China CBM reservoirs.It is pointed out that five items are very important in developing China CBM resources.They are:①enhancing reservoir permeability;②cultivating adequate pressure difference from the production wellbore to far away; ③speeding up gas desorption;④making use of the relief zone;⑤avoiding pulverized coal lenses.To develop various particular CBM reservoirs in China, three technology series are proposed.They are as follows:①relief zone related gas production technology;②multilateral horizontal well pattern plus cavitation technology;③commonly used surface drilling technology.