摘要
转向重复压裂是挖掘老区低渗油藏剩余油的重要途径,目前常规转向压裂技术存在着裂缝是否转向、缝内转向方式如何以及怎样实现缝内转向等问题,最终导致裂缝转向程度不理想、压后效果不明显、压后解释不准确。在岩石力学、断裂力学、水力压裂力学基础上,结合压裂裂缝转向理论,提出了"缝内二次转向压裂"的概念,通过分析对比缝内转向压裂可能出现的4种裂缝形态,发现在水平应力差拐点处实施缝端暂堵转向压裂可最大程度沟通油藏,分析了其适用的储集层条件、关键技术,并给出初步设计方法。该技术对发展转向压裂技术体系、由经验型压裂向精细化压裂的转变具有重要的意义。
Deflection re-fracturing is an important way of liberating remaining oil in low permeability reservoir in old fields. However, con- ventional deflection re-fracturing technology has many problems： whether the fracture is deflected or not？ How does the deflected fracture propagate？ How to get the fracture deflected accurately？ Finally, they genenrally cause the unsatisfactory deflecting angle, ineffective treat- ment, inaccurate effect evaluation, etc. In view of this and on the basis of rock mechanics, fracture mechanics and hydraulic fracturing me- chanics, this paper puts forward the concept of ＂secondary deflection fracturing in fractures＂, analyzes and contrasts four kinds of fracture shapes that probably appear in deflection fracturing in fractures. And it is concluded that the best deflecting position is just at the inflection point of horizontal stress difference, which can get maximum communication with reservoirs. Also, applicable reservoir conditions, key tech- niques and the preliminary design methods are presented. These techniques are of great significance for developing deflection fracturing systems and for converting empirical fracturing treatment to fine fracturing treatment.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2013年第3期349-353,共5页
Xinjiang Petroleum Geology
关键词
转向压裂
二次转向
缝内转向
缝端封堵
水平应力差拐点
deflection fracturing
secondary fracture deflection
deflection in fracture
fracture end plugging
horizontal stress differenceinflection point
