渝东南地区龙潭组煤层气高效压裂及排采工艺探索

Exploration of Efficient Fracturing and Drainage Technology for CoalbedMethane in Longtan Formation of Southeast Chongqing

渝东南地区面临煤层改造不充分、排采见气周期长、产量低等问题。为提高气井开发效率,以该地区D1井龙潭组开发为例,采用以“远支撑”为核心理念的大排量、大规模、多轮次压裂技术体系进行储层改造试验,并辅以“快排上产、达产稳压”排采工作制度。研究结果表明,此压裂技术的应用可显著改善储层导流能力,压完即见气,且在快速返排过程中气量日趋上涨,直至稳定于5000 m^(3)/d以上。

Problems such as inadequate coal seam reconstruction,long period of gas production and low yield that existed in the Southeast Chongqing area.In order to improve the efficiency of gas well development,the innovative test,taking the Longtan formation development of well D1 in this area as an example,adopts the large-displacement,large-scale,multi-round fracturing technology system with"far support"as the core concept and supplemented by the drainage system of"starting production after rapid discharge and stabilizing pressure after reaching production target".The research results show that the application of this fracturing technology can significantly improve the permeability of the reservoir,and gas is found immediately after pressure completion,and the gas volume increases gradually during the rapid flowback process until it is stable above 5000 m^(3)/d.