收稿日期: 2013-08-23
修回日期: 2013-10-09
网络出版日期: 2014-03-10
基金资助
中国石油科技创新基金(编号:2011D-5006-0201);新世纪优秀人才支持计划(编号:NCET-11-1062);四川省杰出青年学术技术带头人资助计划(编号:2012JQ0010)联合资助.
Stability of the Natural Fracture When the Hydraulic Fracture Is Approaching
Received date: 2013-08-23
Revised date: 2013-10-09
Online published: 2014-03-10
在考虑天然裂缝闭合程度的情况下，基于弹性力学及断裂力学理论，建立了水力裂缝逼近天然裂缝时天然裂缝面应力场模型并得到其解析解，同时进一步明确了水力裂缝诱导应力的意义及其作用方式。天然裂缝稳定性影响因素敏感性分析表明：水力裂缝在逼近天然裂缝过程中会在很大程度上影响天然裂缝的稳定性，影响因素包括水平应力差异系数、水平主应力差值、逼近角、逼近距离、净压力、天然裂缝闭合程度以及水力裂缝长度，其中水平应力差异系数、水平应力差、逼近角以及净压力的影响最为显著，逼近角与逼近距离还会影响失稳中心点的位置。分析了各个因素对失稳区域范围的影响，明确了影响天然裂缝稳定性的因素以及影响程度，为建立准确、完善、系统的缝网压裂理论奠定基础。
赵金洲，杨海，李勇明，王刚，伍洲 . 水力裂缝逼近时天然裂缝稳定性分析[J]. 天然气地球科学, 2014 , 25(3) : 402 -408 . DOI: 10.11764/j.issn.1672-1926.2014.03.402
Considering the degree of natural fracture closure,a stress field model of natural fracture face with approaching hydraulic fracture is developed via elasticity theory and fracture mechanics.Moreover,this paper clarifies the definition of induced-stress of hydraulic fracture and the way it works.Based on the sensitivity study of influences on natural fracture stability,it is found that the approaching hydraulic fracture can significantly affect the stability,and the factors include the horizontal principal stress ratio,horizontal principal stress contrast,approaching angle,approaching distance,net pressure,degree of natural fracture closure and the length of hydraulic fracture.In this study,it is also found that the approaching angle and approaching distance deviate the position of shear failure center from original,and the role of horizontal principal stress contrast and its ratio,approaching angle and the net pressure are much more critical in stability of natural fracture than other factors.This paper also analyzes the range within which the shear failure occurs.According to the analysis of the stability of natural facture when the hydraulic facture is approaching,the impacts of hydraulic fracture to the stability of natural fracture are expounded in this paper;therefore,it provides a foothold for developing an accurate and systematic theory of network fracturing in future.
［1］Qiu Zhen,Zou Caineng,Li Jianzhong,et al.Unconventional petroleum resources assessment:Progress and future prospects［J］.Natural Gas Geoscience,2013,24(2):238-246.［邱振,邹才能,李建忠,等.非常规油气资源评价进展与未来展望［J］.天然气地球科学,2013,24(2):238-246.］
［2］Zhao Jingzhou.Conception,classification and resource potential of unconventional hydrocarbons［J］.Natural Gas Geoscience,2012,23(3):393-406.［赵靖舟.非常规油气有关概念、分类及资源潜力［J］.天然气地球科学,2012,23(3):393-406.］
［3］Cheng Yuanfang,Xu Taishuang,Wu Bailie,et al.Experimental study on the hydraulic fractures′morphology of coal bed［J］.Natural Gas Geoscience,2013,24(1):134-137.［程远方,徐太双,吴百烈,等.煤岩水力压裂裂缝形态实验研究［J］.天然气地球科学,2013,24(1):134-137.］
［4］Weng Dingwei,Lei Qun,Xu Yun,et al.Network fracturing techniques and its application in the field［J］.Acta Petrolei Sinica,2011,32(2):280-284.［翁定为,雷群,胥云,等.缝网压裂技术及其现场应用［J］.石油学报,2011,32(2):280-284.］
［5］Long Pengyu,Zhang Jinchuan,Tang Xuan,et al.Feature of muddy shale fissure and its effects for shale gas exploration and development［J］.Natural Gas Geoscience,2011,22(3):525-532.［龙鹏宇,张金川,唐玄,等.泥页岩裂缝发育特征及其对页岩气勘探和开发的影响［J］.天然气地球科学,2011,22(3):525-532.］
［6］Warpinski N R,Teufel L W.Influence of geologic discontinuities on hydraulic fracture propagation［J］.Journal of Petroleum Technology,1987,39(2):209-220.
［7］Renshaw C E,Pollard D.D.An experimentally verified criterion for propagation across unbonded frictional interface in brittle,linear elastic materials［J］.International Journal of Rock Mechanics and Mining Sciences & Geomechanics,1995,32(3):237-249.
［8］Gu H,Weng X.Criterion for Fracture Crossing Frictional Interfaces at Non-orthogonal Angles［R］.American Rock Mechanics Association,Paper,ARMA 10-198,2010.
［9］Gu H,Weng X,Land J,et al.Hydraulic fracture crossing natural fracture at nonorthogonal angles:A criterion and its validation［J］.SPE Production & Operations,2012,27(1):20-26.［10］Xu Zhilun.Elasticity［M］.Beijing:Higher Education Press,2011:88-115.［徐芝纶.弹性力学理论［M］.北京:高等教育出版社,2011:88-115.］
［11］Zhao Huiyua,Translated.Some Basic Problems of the Mathematical Theory of Elasticity［M］.Beijing:Science Press,1958:254-266.［赵惠元,译.数学弹性力学的几个基本问题［M］.北京:科学出版社,1958:254-266.］
［12］Fan Tianyou.Fundamentals of Fracture Theory［M］.Beijing:Science Press,2006:20-35.［范天佑.断裂理论基础［M］.北京：科学出版社,2006:20-35.］
［13］Zhao Junlong,Zhu Guangshe.Comprehensive Judgment and Recognition Technology of the Characteristics of Natural Fractures Developed in the Low-permeable Sandstones［M］.Beijing:Petroleum Industry Press,2011:6-8.［赵军龙,朱广社.低渗透砂岩天然裂缝综合判识技术研究［M］.北京：石油工业出版社,2011:6-8.］
［14］Dyer R.Using joint interaction to estimate paleostress ratios［J］.Journal of Structural Geology,1988,10(7):685-699.
［15］Lv Jizhong.A formulation for determining direction of principal stresses［J］.Journal of Northwest Institute of Architecture Engineering,1997,4:76-78.［吕继忠.一个确定主应力方向的计算公式［J］.西北建筑工程学院学报,1997,4:76-78.］
［16］Potlturi N,Zhu D,Hill A D.Effect of natural fracture on hydraulic fracture propagation［C］//SPE European Formation Damage Conference,25-27 May 2005,Sheveningen,Netherlands.SPE 94568.Richardson:Society of Petroleum Engineers,2005.
［17］Olson J E,Bahorich B,Holder J.Examining hydraulic fracture-natural fracture interaction in hydrostone block experiments［C］// SPE Hydraulic Fracturing Technology Conference,6-8 February 2012,Texas:SPE 152618.Richardson:Society of Petroleum Engineers,2012.
［18］Zhou Jian,Xue Chengjin.Experimental investigation of fracture interaction between natural fractures and hydraulic fracture in naturally fractured reservoirs［C］// SPE Europec/Eage Annual Conference and Exhibition,23-26 May 2011,Austria.SPE 142890.Richardson:Society of Petroleum Engineers,2011.
［19］Lamont Norman,Jessen F W.The effects of existing fractures in rocks on the extension of hydraulic fractures［J］.Journal of Petroleum Technology,1963,15(2):203-209.
［20］Blanton L.Thomas.An experimental study of interaction between hydraulically induced and pre-existing fractures［C］// SPE Unconventional Gas Recovery Symposium,16-18 May 1982,Pennsylvania.SPE 10847.Richardson:Society of Petroleum Engineers,1982.
［21］Blanton L T.Propagation of hydraulically and dynamically induced fractures in naturally fractured reservoirs［C］// SPE Unconventional Gas Technology Symposium,18-21 May 1986,Kentucky.SPE 15261.Richardson:Society of Petroleum Engineers,1986.
［22］Anderson D G.Effects of friction on hydraulic fracture growth near unbonded interfaces in rocks［J］.SPE Journal,1981,21(1):21-29.
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