预制裂缝角度对页岩水力压裂效果影响分析

发布时间：2018-03-09 05:07

本文选题：页岩气　切入点：水力压裂　出处：《应用基础与工程科学学报》2017年04期 　论文类型：期刊论文

【摘要】：水力压裂是页岩气储层增透开采核心技术,预制裂缝是提高水力压裂效果的主要手段.为了分析不同预制裂缝角度对水力压裂效果影响规律,建立页岩气水平井预制裂缝二维力学模型,考虑水力压裂压强、气藏埋深及侧压比因素,提出了最佳预制裂缝角度区间概念.以水力压裂有效影响面积为指标,确定了最佳预制裂缝角度区间.结果表明:水力压裂压强、侧压比、不同气藏深度下水力压裂有效影响面积均随预制裂缝角度而变化,且变化规律具有一致性.最佳预制裂缝角度区间为55°~65°,水力压裂效果最好;预制裂缝角度为90°时,水力压裂效果次之;预制裂缝角度40°、70°时,对压裂效果影响面积最小,水力压裂效果最差.随水力压裂压强增大,有效压裂影响面积增大,但压裂影响的增加幅度逐渐减小.
[Abstract]:Hydraulic fracturing is the core technology of antipenetration exploitation in shale gas reservoir, and prefabricated fracture is the main means to improve hydraulic fracturing effect. In order to analyze the influence of different prefabricated fracture angles on hydraulic fracturing effect, A two-dimensional mechanical model of prefabricated fractures in shale gas horizontal wells is established. Considering the factors of hydraulic fracturing pressure, gas reservoir burial depth and lateral pressure ratio, the concept of optimal prefabricated fracture angle interval is proposed. The effective area affected by hydraulic fracturing is taken as the index. The results show that the hydraulic fracturing pressure, lateral pressure ratio and the effective area of hydraulic fracturing vary with the prefabricated fracture angle under different gas reservoir depths. The optimum prefabricated fracture angle interval is 55 掳/ 65 掳, the hydraulic fracturing effect is the best, when the preform fracture angle is 90 掳, the hydraulic fracturing effect is the second, and when the prefabricated fracture angle is 40 掳/ 70 掳, the area affected by the fracturing effect is the least. The effect of hydraulic fracturing is the worst. With the increase of hydraulic fracturing pressure, the effective fracturing effect area increases, but the increasing range of fracturing effect decreases gradually.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金面上项目(51374119) 辽宁省百千万人才工程资助项目(2013921056) 辽宁省自然科学基金优秀人才培育项目(2014020156) 辽宁省高等学校优秀人才支持计划(LR2015028)
【分类号】：TE377

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