水平井压裂裂缝局部应力场扰动规律

发布时间：2018-01-28 13:25

本文关键词： 水平井压裂压裂裂缝有限元数值模拟应力扰动影响因素　出处：《油气地质与采收率》2016年06期 　论文类型：期刊论文

【摘要】：压裂裂缝形成复杂裂缝网络是非常规储层改造成功的关键,而裂缝的起裂和扩展又受控于地层中应力场的分布,所以研究水平井压裂裂缝局部应力场的扰动规律十分必要。为此,建立水平井井筒集中应力与裂缝诱导应力叠加的水平井压裂裂缝局部应力场计算模型,利用有限元数值分析软件Comsol Multiphysic,模拟分析裂缝净压力、裂缝长度、裂缝条数和裂缝间距对水平井压裂裂缝局部应力场的扰动情况,并揭示各影响因素对应力场的扰动规律。结果表明,水平井压裂裂缝对最小水平主应力的扰动程度更为显著,其中裂缝净压力和裂缝条数与局部应力场的应力扰动幅度呈正相关关系,裂缝长度的增加会引起应力扰动距离的增大,而裂缝间距的增加则会使裂缝间应力扰动程度降低。
[Abstract]:The formation of complex fracture network is the key to the success of unconventional reservoir reconstruction, and the fracture initiation and expansion are controlled by the distribution of stress field in the formation. Therefore, it is necessary to study the disturbance law of fracture local stress field in horizontal wells. Therefore, a calculation model of fracture local stress field in horizontal wells is established, in which the concentrated stress and fracture-induced stress in horizontal wells are superimposed. The net crack pressure and crack length are simulated and analyzed by using the finite element numerical analysis software Comsol Multiphysico. The disturbance of fracture bar number and fracture spacing on the local stress field of fracture in horizontal well and the disturbance law of various influencing factors to the stress field are revealed. The disturbance degree of fracture to minimum horizontal principal stress is more obvious in horizontal well, in which the net fracture pressure and the number of fracture strips are positively correlated with the amplitude of stress disturbance in local stress field. The increase of crack length will cause the increase of stress disturbance distance, and the increase of crack spacing will reduce the stress disturbance between fractures.
【作者单位】：东北石油大学石油工程学院;
【基金】：国家自然科学基金项目“致密储层井工厂压裂应力场演化机理及调控方法”(51504067)和“页岩油气高效开发基础理论研究”(51490650)及“基于应力-渗流-损伤多场耦合的清水压裂机理及储层筛选研究”(51274069) 东北石油大学研究生创新科研项目“致密油气藏体积压裂局部应力场改造控制机理研究”(YJSCX2015-017NEPU)
【分类号】：TE357.11
【正文快照】： 水平井压裂是目前开发低孔、低渗透非常规油气储层的主要手段,可改变近井筒地带流体的渗流方式,从而提高油井产量和采收率。Maxwell等利用微地震裂缝监测技术,发现压裂复杂裂缝网络的存在,并提出储层改造体积这个概念[1-5]。针对非常规油气藏体积改造技术的迅速发展,以水平井

【相似文献】