2016年8月第35卷第4期
大庆石油地质与开发
Petroleum Geology and Oilfield Development in Daqing
DOI:10.3969/J.ISSN.1000-3754.2016.04.020
同步压裂时裂缝延伸规律
贺沛
周德胜
（西安石油大学石油工程学院，陕西西安710065）
Ang，2016 Vol. 35 No. 4
摘要：同步压裂是对两口或两口以上基本平行的水平井的对应井段同时进行压裂施工，以期获得更好的单井产量、提高采收率。以边界元方法中位移不连续法为基础，根据岩石断裂力学，结合裂缝转向机理建立一个平面二维模型，模拟研究两口并同步压裂时裂缝的延伸，对比相同条件下单井压裂时裂缝的延伸情况，讨论缝内净压力和缝间距对裂缝廷伸路径的影响。研究表明：在相同的条件下，同步压裂比单井压裂更容易使裂缝发生偏转；同步压裂时裂缝相互吸引、靠近，单井压裂时裂缝相互排斥、远离；缝内净压力对裂缝偏转的影响大于缝
间距。该研究为致密油以及页岩气实施同步压裂提供了理论依据与参考。关键词：同步压裂；裂缝延伸；位移不连续；裂缝转向
中图分类号：TETE357
文献标识码：A
文章编号：1000-3754（2016）04-0102-07
LAWSOFTHEFRACTUREPROPAGATIONFOR
THESIMULTANEOUSFRACTURING
HE Pei,ZHOU Desheng
(Xi'an ShiyouUniversity，Xian 710065,China)
Abstract : The simultaneous fracturing is the stimulation that fractures two or more than two generally parallel cor-responding intervals of the horizontal wells at the same time so as to obtain much better individual-well production and recovery factor. With the help of the displacement discontinuity method in the boundary element approach and the theory of rock fracture, and moreover integrated with the mechanism of crack reorientation, the planar 2D model was established to simulate the fracture propagation in the two simultaneously fractured wells. And then the fracture extension conditions were contrasted with the individual well fracturing in the same condition, and finally the influ-ences of the net pressure inside the fractures and intervals among the fractures were discussed on the fracture spread paths. The achievements show that in the same condition, the fractures from the simultaneous fracturing are easy to deviate and deflect comparing with those of the individual well fracturing: for the former, the cracks attracts and ap-proaches each other, but the latter is just on the contrary: the influences of the net pressures within the fractures are more those of the fracture deflection.
Key words: simultaneous fracturing; fracture propagation; displacement discontinuity; fracture reorientation
改回日期：2016-03-18
收稿日期：2015-09-08
基金项目：陕西省重大科学技术难题攻关项目“陆相页岩气储层压裂改造工艺技术攻关”（2012KTZB03-03-03-02）和
“西安石油大学优秀硕士学位论文培育项目”（2014yp130102）资助。
作者简介：贺沛，女，1990年生，在读硕士，研究方向为非常规油气开采。
E-mail：413505964@qq.com
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