深圳大学学报（理工版）2026，Vol.43Issue(3)：262-272,11.DOI:10.3724/SP.J.1249.2026.03262
煤岩-致密砂岩无隔层储层分层压裂测试工艺
Differentiated staged fracturing and testing for coal-tight sandstone composite reservoirs without interlayer barriers:a case study of Well WFD1
摘要
Abstract
Coal-tight sandstone composite reservoirs without interlayer barriers are prone to interlayer fracture interference,ineffective stimulation,and difficulties in production evaluation due to strong contrasts in lithology,petrophysical properties,and in-situ stress.To address these challenges in Well WFD1,a differentiated staged fracturing and testing strategy was proposed and implemented based on reservoir characteristics.The coal rock interval was treated using moderate pumping rates(6.0-10.0 m3/min)with medium-scale fracture network stimulation,combined with variable-rate control of fracture height and multi-size proppant placement to enhance conductivity while mitigating water sensitivity damage.The tight sandstone interval was fractured using a moderate-scale,low proppant concentration design with composite proppants(150 μm ceramic fines+212 to 425 μm quartz sand+300 to 850 μm quartz sand),coupled with liquid nitrogen-assisted injection to improve flowback efficiency.During the production stage,a dual-packer pumping string was deployed to achieve effective zonal isolation,enabling independent flowback and production testing of the coal and sandstone intervals.Field results indicate that fracture height growth was effectively controlled,no interlayer communication occurred,and both reservoir intervals were successfully stimulated.Reliable production capacity and fluid properties of the coal-tight sandstone were obtained for each layer.These results indicate that the proposed differentiated staged fracturing and testing technology is effective for coal-tight sandstone composite reservoirs without interlayer barriers and provides a practical reference for safe stimulation and accurate zonal evaluation of similar coal-measure gas reservoirs.关键词
水力压裂工程/南华北盆地/致密砂岩气/煤系气/无隔层储层/分层压裂/分层测试Key words
hydraulic fracturing/Southern North China Basin/tight sandstone gas/coal-measure gas/reservoirs without interlayer barriers/staged fracturing/staged testing分类
能源科技引用本文复制引用
朱迪斯,王胜建,赵洪波,薛宗安,胡宏,岳伟民,杨平洲,迟焕鹏,石砥石,刘恩然,徐秋晨..煤岩-致密砂岩无隔层储层分层压裂测试工艺[J].深圳大学学报（理工版）,2026,43(3):262-272,11.基金项目
Geological Survey Project Funded by China Gedogical Survey(DD20190725,DD20242400) 中国地质调查局地质调查资助项目(DD20190725,DD20242400) （DD20190725,DD20242400）
