煤层气储层保护钻井关键技术研究

The Key Drilling Technique of Formation Protection for Coal-bed Methane

随着我国油气资源勘探开发工作的进一步深入,煤层气开发正进入规模化开发应用阶段。由于煤层气储层的特殊性,钻井过程中容易造成储层损害,因此对煤层气储层保护钻井关键技术进行研究具有重要的实际意义。分析了钻井过程中煤层气储层的损害机理,探讨了保护煤层气储层的钻井关键技术,认为采用欠平衡钻井方式,根据储层条件与施工情况优化钻井参数和计算最大允许下钻速度,可以有效保护煤层气储层,对于提高煤层气开发效率具有一定的指导意义。

With the further deepening of oil exploration and development in China,the development of CBM entered into development and application at large-scale stage.Because of the specificity of CBM reservoirs,it was easy to cause formation damage in drilling,therefore it was of important and practical significance to study the key drilling techniques for protecting CBM reservoirs.The drilling damage mechanism of CBM reservoir was analyzed,the key techniques of drilling for protecting CBM reservoirs were discussed.It is considered that under-balanced drilling methods can be used for optimizing drilling parameters and calculating maximum allowable pipe running in speed,therefore CBM reservoirs are effectively protected and it provides a guidance for improving the development efficiency of CBM reservoirs.