ICS75.020CCSE10/1921辽宁省地方标准DB21/T3899—2023地面煤层气井压裂效果评价规范Specificationforevaluationoffracturingeffectivenessofsurfacecoalbedmethanewells2023-12-30发布2024-01-30实施辽宁省市场监督管理局发布DB21/T3899—2023I目次前言..................................................................................II1范围......................................
