煤层气排采工艺技术研究和展望

Research and Prospect About the CBM Drainage Technology

煤层气勘探开发的主要工艺技术流程是钻井、压裂和排采,排采是煤层气开发的重要环节。作为开发链条上的重要环节,很长时期并未受到足够的重视。根据煤层气的排采机理,重点阐述了国内外煤层气排采工艺技术,提出煤层气井压裂裂缝三维延伸模型和产量动态预测模型,分析了煤层气排采不合理所造成的问题,可以通过控制生产压差和排采速度,调整排采组合方式,采用定压排采和定产排采相结合的方法来解决或缓解。实现煤层气排采定量化和自动化,对合理开发煤层气、提高煤层气藏开采规模、降低成本和优化中国能源结构具有重要意义,是十分必要和紧迫的。

The main technology of exploitation and development of CBM is drilling, fracturing and draining, The draining is the important part of the CBM development, but it has not be recognized for the long time. Based on the draining mechanism of the CBM, the 3D extend models and performance prediction models of the induced fracture of the CBM were presented in this paper, and some unreasonale problems of the CBM draining were analyzed. The drainage array mode can be adjusted by controlling the production pressure drop and the drainage speed. It is necessary and compulsory for our country to develop CBM reasonably, improve the level of CBM reservoir, low the cost and optimize the construction of our national energy.