绒囊工作液在煤层气勘探开发中的应用前景

选择合适的井筒工作流体用于勘探开采煤层气迫在眉睫。泡沫类工作液已成为煤层气作业的重要选择之一，在国内外煤层气作业中应用广泛。在泡沫类工作液基础上研发的绒囊工作液，不但解决了泡沫类工作液在液柱压力下泡沫消失问题，而且在煤层气钻井过程中表现出密度可调、承压能力强、封堵性能好、储层保护效果明显等特点。实例还表明绒囊工作液匹配地层裂缝、孔道大小或形状的自适应能力强，全面封堵渗流通道。这种自适应地层渗流通道的作用机理表明，绒囊工作液在煤层气欠平衡钻井、低密度水泥浆固井、提高地层承压能力以及储层改造等方面应该有很好的应用前景。要实现这些作业环节成功应用绒囊工作液，应加强绒囊工作液在钻井液、水泥浆、射孔液和压裂液等方面的应用研究，满足煤层气勘探开发需要。

APPLICATION PROSPECT OF FUZZY BALL WORKING FLUID IN COALBED METHANE EXPLORATION

It is urgent to choose an appropriate working fluid for coalbed methane exploration and development. The foam working fluid as one choice of coalbed exploration has been used extensively worldwide. The fuzzy-ball working fluid which is based on foam working fluid not only prevent vanishment of foam, but also bears of adjustable fluid density, pressure-bearing capacity, good sealing capability and excellent reservoir protection. It is proven to be of a strong self-adapting capability in sealing strata fissures, channels sizes and shapes, which show a good application prospect in coalbed methane unbalance drilling, low-density cement slurry, increasing strata pressure-bearing capability and reservoir reconstruction. To achieve this application of fuzzy-ball working fluid, research shall be enhanced in drilling fluid, cement slurry, perforating fluid and fracturing fluid.