Evaluation on Conductivity Performance of Proppant in Shale Gas Network Fracturing
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摘要: 页岩气水平井长缝网络压裂支撑剂铺置浓度低，嵌入伤害大，导流特性与常规油气藏不同，与北美页岩气水平井中短缝压裂也有明显差异。为评价不同类型支撑剂在低铺砂浓度下的导流特性，采集龙马溪组地层页岩露头制作试验岩样，使用 FCES-100 裂缝导流仪对陶粒、石英砂、覆膜砂3种类型支撑剂在不同粒径、不同铺砂浓度和不同闭合压力条件下的导流特性进行了评价。结果表明：支撑剂类型、闭合压力和铺砂浓度对页岩支撑裂缝的导流能力影响较大；中高闭合压力和低铺砂浓度条件下，覆膜砂的导流能力最大，陶粒次之，石英砂最小。评价结果可为页岩气ESRV（effective stimulation reservoir volume）网络压裂裂缝导流能力的优化、支撑剂的优选和压裂设计提供依据。Abstract: In shale gas development from horizontal well,network fracturing often has low sand concentration and serious embedment damage,which leads to different conductivity performance from conventional reservoirs and also it is different from short-medium hydraulic fracturing in North America.In order to obtain the conductivity performance of proppant in shale gas network fracturing,experiments were done and those rock samples were from Longmaxi shale outcrop.By use of FCES-100 Fracture Conductivity Evaluation System,three kinds of porppant(ceramic,sand and resin coated sand)were tested under different conditions in terms of proppant size,concentration and closure pressure.The results showed that sand concentration,closure pressure and proppant type had obvious effect on conductivity of propped fractures in shale.Under medium or high closure pressure and low sand concentration,resin coated sand featured the highest conductivity,followed by ceramic and sand.These evaluation results provided basis for optimizing conductivity in shale gas ESRV network fracturing,porppant selection and stimulation design.
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Keywords:
- shale gas /
- network fracturing /
- proppant /
- flow conductivity /
- laboratory testing
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