临兴区块石盒子组致密砂岩气储层压裂缝高控制数值模拟研究

发布时间：2018-01-19 22:31

本文关键词： 缝高控制水力压裂有限元层状介质致密砂岩　出处：《煤炭学报》2017年09期 　论文类型：期刊论文

【摘要】：对含上下隔层的致密砂岩进行水力压裂增产作业时,储隔层间应力差、物性差异等地质因素和压裂液黏度、施工排量、射孔位置等工程因素对水力裂缝延伸规律影响显著。针对鄂尔多斯盆地东缘临兴区块石盒子组致密气砂岩储层,基于ABAQUS有限元计算平台,建立三维层状介质的压裂缝高数值模型,研究各因素对裂缝高度控制的影响规律。研究结果表明:临兴区块石盒子组储层压裂施工产生垂直形态的水力裂缝,储隔层应力差是最关键控制因素,当大于4 MPa时可以有效控制缝高;弹性模量低的隔层对控制压裂缝高有利;泊松比对于压裂缝高几乎没有影响;高储隔层应力差(4 MPa)下施工排量小于6 m~3/min时,裂缝延伸抑制作用明显;低储隔层应力差下(2 MPa)施工排量越大,裂缝在隔层内延伸程度越大;压裂液黏度低于10 m Pa·s时对压裂缝高影响很小;射孔位置的不同对于裂缝起裂阶段影响显著,储层上部射孔时裂缝最终形态和压裂缝高较储层中部射孔和全井段射孔差异很大。开展室内试验研究施工排量、射孔位置等工程因素对裂缝穿层扩展的影响,试验结果与数值模拟结果吻合良好。研究结论可为油田现场预测裂缝形态,选择合适层位,优化压裂参数提供借鉴。
[Abstract]:During hydraulic fracturing and increasing production of tight sandstone with upper and lower interlayer, geological factors such as stress difference and physical property difference between reservoir and septum, viscosity of fracturing fluid and operation displacement are obtained. Perforation location and other engineering factors have a significant impact on the hydraulic fracture extension law. Aiming at the tight gas sandstone reservoir of Shihezi formation in Linxing block in the eastern edge of Ordos Basin based on ABAQUS finite element calculation platform. In this paper, a numerical model of fracturing height in three dimensional layered media is established, and the influence of various factors on fracture height control is studied. The results show that hydraulic fractures in vertical form are produced during fracturing operation of Shihezi formation reservoir in Linxing block. The stress difference of reservoir and septum is the most important control factor, and the fracture height can be effectively controlled when it is more than 4 MPa. The interlayer with low elastic modulus is advantageous to control the high of compressive fracture. Poisson's ratio has little effect on the fracture height. When the construction displacement is less than 6 mm3 / min under the stress difference of 4 MPa, the effect of crack extension inhibition is obvious. The larger the construction displacement is, the greater the extension degree of cracks in the diaphragm is. When the viscosity of fracturing fluid is less than 10 MPA 路s, the influence of fracturing fluid viscosity on fracture height is very small. The effect of perforation location on fracture initiation stage is significant. The final fracture morphology and pressure fracture height of upper reservoir perforation are more different than that of perforation in the middle part of reservoir and the whole well section. The effect of engineering factors such as perforation location on fracture propagation is in good agreement with the numerical simulation results. Optimization of fracturing parameters provides reference.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;中国海洋石油研究总院钻采研究院;
【基金】：“十三五”国家科技重大专项资助项目(2016ZX05058002)
【分类号】：TE377
【正文快照】： 作为一种非常规油气藏,致密砂岩气藏因其潜在的巨大资源量和良好的勘探开发前景,在油气勘探开发领域已成为国内外众多学者的研究热点和前沿问题[1-2]。鄂尔多斯盆地东缘晋西挠褶带临兴区块具有巨大的天然气勘探开发潜力,是我国重要的致密砂岩气接替区。区块具有低平宽缓的构造

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