沁水盆地南部高煤阶煤层气井排采工艺研究与实践

中国石油华北油田公司在沁水盆地南部进行高煤阶煤层气开发5年来，已实现年外输气量4×10⁸ m³，排采工艺和技术取得了一定成效。但是，目前还存在对该区煤储层认识不深入，没有成熟的排采技术可以借鉴，井底流压与产气量、产水量的关系认识不清，缺乏专用排采工具等问题。为此，开展了气、水、煤粉多相流动态变化对煤储层的敏感性研究，揭示出了不同开发方式下的煤层气排采规律，并制订出相应的排采技术规范--“五段三压”法（排水段、憋压段、控压段、高产稳产段和衰竭段；井底流压、解吸压力、地层压力）；研发配套的排采工具，形成了拥有自主知识产权的平稳、高效、低成本的煤层气井排采技术系列--排采设备及工艺优化技术、内置防砂管技术和煤层气井智能控制技术；深化产气规律认识，建立了半定量科学排采工作制度，从而降低了对煤储层的伤害，提高了单井产气量。该工艺为沁水盆地南部煤层气田樊庄、郑庄区块15×10⁸ m³煤层气产能建设提供了技术支撑。

Technologies in the CBM drainage and production of wells in the southern Qinshui Basin with high-rank coal beds

Since the CBM fields in the Qinshui Basin with high-rank coal beds,operated by the PetroChina North China Oilfield Company,was put into production five years ago,about 400million m3 of CBM gas per year has been transported outside and the related technologies of CBM drainage and production have been developed as well.However,the CBM production there still faces many other challenges such as a poor understanding of coal reservoirs,no mature techniques available,vague relationships between bottomhole flow pre...