煤层群条件下合层多段压裂技术研究

贵州地区普遍发育薄—中厚煤层群,煤层气开发地质条件复杂特殊,需要与之相匹配的工艺技术。在具体分析贵州地区煤层群发育特点的基础上,提出煤层气合层多段压裂技术。合层多段压裂是从煤层群的角度出发,从同一口井中优选多个压裂段,每个压裂段包含相邻的多个煤层及煤层之间的夹层;通过小层射孔,投球封堵,填砂封隔,可降低施工难度,提高合层多段压裂施工效果。合层多段压裂技术已在盘江矿区松河矿煤层气地面开发示范工程中应用实施并取得一定成效。

Study on the Technology of Full-zone and Multi-stage Fracturing under Condition of Coal Seams

Thin and medium-thickness coal seams are developed commonly in Guizhou, the geologic conditions of coalbed methane (CBM) exploration are complicated and special. Based on the analysis on the characteristics of coal seams development in Guizhou, the technology of full-zone and multi-stage fracturing was suggested. Several fractured segments are optimized in one same well, each segment comprises a plurality of adjacent coal seams and interlays between coal seams. Construction difficulty can be reduced by ball plugging and sand filling & sealing. Full-zone and multi-stage fracturing technology has been applied in CMB ground development demonstration project of Songhe mine of Liupanshui coalfield with some success.