径向孔眼辅助压裂裂缝形态

发布时间：2018-02-09 06:06

本文关键词： 压裂径向孔眼裂缝形态地应力干扰应力场　出处：《大庆石油地质与开发》2017年02期 　论文类型：期刊论文

【摘要】：为研究不同径向孔眼参数对裂缝形态的影响规律,基于地层流-固耦合方程,应用ABAQUS有限元软件,利用最大拉应力准则判断裂缝起裂位置并预测裂缝扩展形态,最后通过大型真三维物模实验验证数模结果。结果表明:在径向孔眼内水力加压会改变原始地应力分布并形成干扰应力场;裂缝面由孔眼起裂并以缝高增长的方式扩展,当缝高增长超出干扰应力场后受水平地应力差影响转向;当同一水平面孔眼数量大于4时,干扰应力场即可互相连结成新的应力场;当以x、y轴均对称方式钻孔会形成形态复杂的多裂缝。径向孔眼对压裂裂缝具有引导能力,多径向孔眼具备构造复杂多裂缝的能力,利用径向孔眼对压裂裂缝的影响特性可有效提高传统压裂技术的改造效果,提高产能。
[Abstract]:In order to study the influence of different radial hole parameters on fracture morphology, based on the laminar fluid-solid coupling equation, the ABAQUS finite element software is used to judge the crack initiation position and predict the fracture propagation pattern by using the maximum tensile stress criterion. Finally, the numerical simulation results are verified by large scale true 3D model experiments. The results show that hydraulic pressure in radial hole can change the original stress distribution and form the interference stress field, and the fracture surface is split by the hole and expanded in the way of the height of the fracture. When the height of the joint increases beyond the interference stress field, it is influenced by the horizontal stress difference, and when the number of horizontal eyes is more than 4:00, the interference stress field can be connected to each other into a new stress field. When drilling holes with uniform symmetry of XY axis form complex multi-fractures, radial holes have the ability to guide fracturing fractures, and multi-radial holes have the ability of structuring complex multi-fractures. The effect of radial hole on fracturing fracture can be improved effectively by traditional fracturing technology.
【作者单位】：中国石油大学石油工程学院;胜利油田分公司石油工程技术研究院;
【基金】：国家自然科学基金青年基金项目“径向钻孔引导水力压裂裂缝定向扩展机理研究”(51404288)
【分类号】：TE357.1

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