川西须五裂缝性气藏压裂技术研究

发布时间：2019-02-22 09:20

【摘要】：川西新场构造须五段气藏为泥页岩、粉-细砂岩多层系叠置的特低孔超致密储层,埋深2500-3500m,天然裂缝发育。水力压裂是须五气藏投产的必要手段,由于川西须五气藏天然裂缝发育,裂缝破裂方式与裂缝扩展模式与常规砂岩气藏有本质区别。因此,有必要开展针对须五裂缝性气藏的裂缝起裂及延伸模式的研究,对于指导现场压裂工程设计具有重要的意义。本文主要完成了以下工作： (1)分析了须五裂缝性致密砂岩气藏的地质特征,总结了与压裂相关的储层物性、岩石力学参数和裂缝产状及分布规律。 (2)利用弹性力学理论及几何变换,建立了斜井井筒围岩和孔眼壁面的应力分布模型；根据断裂力学理论,考虑孔眼与天然裂缝相交的情况,建立了不同起裂方式下的破裂压力计算模型,并使用须五气藏地质参数计算分析了破裂压力的影响因素。 (3)运用经典的水力裂缝与天然裂缝的相交准则分析计算了水力裂缝与天然裂缝相交的影响因素,包括天然裂缝张开、剪切滑移和被穿过的条件,针对性分析了须五储层压裂改造中可能产生的相交行为。 (4)依据川西须五气藏前期改造经验及本文的研究成果,设计了XC32井压裂方案并进行了现场实施；利用施工数据及微地震监测结果分析了XC32的改造效果,获得了须五裂缝性气藏压裂的相关技术认识。论文以川西须五裂缝性气藏为研究对象,在压裂裂缝起裂和扩展模式方面开展了较为深入的研究,对于指导须五气藏压裂有重要工程意义,对类似裂缝性储层压裂也有借鉴作用。
[Abstract]:The gas reservoir of Xuwu member of Xinchang structure in western Sichuan is shale, silt-fine sandstone multi-layer superimposed ultra-low Kong Chao tight reservoir, buried depth 2500-3500m, natural fracture developed. Hydraulic fracturing is a necessary method for the production of Xuwu gas reservoir. Due to the development of natural fractures in Xuwu gas reservoir in western Sichuan there are essential differences between fracture mode and fracture propagation mode and conventional sandstone gas reservoir. Therefore, it is necessary to study the fracture initiation and extension mode of Xuwu fractured gas reservoir, which is of great significance for guiding the design of field fracturing engineering. The main works of this paper are as follows: (1) the geological characteristics of Xuwu fractured tight sandstone gas reservoir are analyzed, and the reservoir physical properties, rock mechanics parameters, fracture occurrence and distribution law related to fracturing are summarized. (2) based on the theory of elasticity and geometric transformation, the stress distribution model of surrounding rock and hole wall of inclined shaft is established. According to the theory of fracture mechanics, considering the intersection of holes and natural fractures, the fracture pressure calculation model under different fracture initiation modes is established, and the influencing factors of fracture pressure are calculated and analyzed by using the geological parameters of Xuwu gas reservoir. (3) the influence factors of the intersection of hydraulic and natural fractures, including the conditions of natural crack opening, shear slip and passing through, are analyzed and calculated by using the classical criterion of intersecting between hydraulic fracture and natural fracture. The possible intersecting behavior in fracturing reconstruction of Xuwu reservoir is analyzed. (4) according to the experience of early reconstruction of Xuwu gas reservoir in western Sichuan and the research results of this paper, the fracturing scheme of XC32 well is designed and carried out on the spot. The reconstruction effect of XC32 is analyzed based on the operation data and the results of microseismic monitoring, and the relevant technical knowledge of fracturing in Xuwu fractured gas reservoir is obtained. This paper takes the Xuwu fractured gas reservoir in western Sichuan as the research object, and carries out more in-depth research on fracturing fracture initiation and expansion mode, which is of great engineering significance for guiding the fracturing of Xuwu gas reservoir. It can also be used for reference for similar fractured reservoir fracturing.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.1

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