Design and Evaluation of Mini-Frac Scheme in Shale Gas Exploration Well
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摘要: 由于各探区页岩气成藏条件、岩性、物性、含气性和有机地化指标等存在差异,具体压裂方案也大不相同。为正确认识压裂目的层的地质特征、明确主压裂设计目标,探井在正式加砂压裂之前有必要先进行测试压裂。在对比某页岩气探井(A井)关键地层参数指标与美国页岩气开发成熟参数指标的基础上,分析了页岩层可压性条件,提出了测试压裂具体设计思路及方案,并对测试压裂监测结果进行了系统解释与评价。分析评价可知,页岩气井测试压裂所需排量和用液量高于常规测试压裂设计水平;通过分析测试压裂,除了可以得到大量关于主压裂设计施工所需的地层压力、渗透性、闭合应力、裂缝起裂及扩展行为等参数信息外,还可用来判断页岩可压性和网络裂缝形成条件。Abstract: Regional shale gas reservoir has different accumulation conditions,lithologies,physical properties,gas bearing properties and organic geochemistry indices,which lead to different hydraulic fracturing treatment strategies.It is necessary to carry out the mini-frac testing before main fracturing,in order to correctly understand the geological characteristics and the aim of main fracturing.Based on the comparison between the key formation parameter indices of a shale gas exploratory well (Well A) and the mature development parameter indices of American shale gas,the shale frac-ability conditions were analyzed,the specific design ideas and scheme for fracturing test were presented,and the mini-frac monitoring results were interpreted and evaluated systematically.The analysis indicated that,the mini-frac of shale gas needs higher pumping rate and larger liquid volume than conventional mini-frac design; the analysis on mini-frac test not only provided parameters required by the main fracturing design,such as reservoir pressure,permeability,fracture closure stress,fracture initiation and extending,but also could be used to judge the shale formation frac-ability and fracture network forming conditions.
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Keywords:
- shale gas /
- exploratory well /
- mini-frac /
- fracturing design
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