水力裂缝与天然裂缝交错延伸规律

doi:10.7623/syxb201803007

石油学报 ›› 2018, Vol. 39 ›› Issue (3): 320-326,334.DOI: 10.7623/syxb201803007

水力裂缝与天然裂缝交错延伸规律

刘顺¹, 何衡², 赵倩云², 周德胜¹

1. 西安石油大学石油工程学院陕西省油气田特种增产技术重点实验室西部低渗-特低渗油藏开发与治理教育部工程研究中心陕西西安 710065;
2. 中国石油长庆油田公司油气工艺研究院陕西西安 710021

收稿日期:2017-04-24 修回日期:2018-01-02 出版日期:2018-03-25 发布日期:2018-04-10
通讯作者: 刘顺,男,1977年9月生,2002年获西安石油学院学士学位,2009年获中国石油大学(华东)博士学位,现为西安石油大学副教授,主要从事非常规油气压裂增产、油藏模拟等研究。Email:liushun631@163.com
作者简介:刘顺,男,1977年9月生,2002年获西安石油学院学士学位,2009年获中国石油大学(华东)博士学位,现为西安石油大学副教授,主要从事非常规油气压裂增产、油藏模拟等研究。Email:liushun631@163.com
基金资助:
中国石油科技创新基金项目（2016D-5007-0207）、陕西省科技统筹创新工程计划项目（2012KTZB03-03-03-02）和国家自然科学基金项目（No.51604225）资助。

Staggered extension laws of hydraulic fracture and natural fracture

Liu Shun¹, He Heng², Zhao Qianyun², Zhou Desheng¹

1. College of Petroleum Engineering, Xi'an Shiyou University;Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs;Engineering Research Center of Development and Management for Low to Ultra-low Permeability Oil & Gas Reservoirs in West China of the Ministry of Education, Shaanxi Xi'an 710065, China;
2. Oil & Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710021, China

Received:2017-04-24 Revised:2018-01-02 Online:2018-03-25 Published:2018-04-10

摘要/Abstract

摘要：

非常规与致密储层的缝网压裂或分段压裂改造技术使水力压裂裂缝与天然裂缝交错延伸的问题成为焦点。为了更好地控制水力裂缝的延伸方位，达到最优缝网状态，以位移不连续方法为基础，依据单元体的叠加原理，建立了二维裂缝延伸计算模型，对一条水力裂缝与一条天然裂缝在不同倾角、间距、应力等条件下的交错延伸规律进行了量化模拟。研究结果表明：裂缝间距、倾角能较大地影响裂缝延伸幅度，天然裂缝与压裂裂缝间距大于1 m、倾斜角小于70°时，压裂裂缝会诱使天然裂缝转弯延伸，直至相交；主应力比值对交错裂缝延伸幅度有一定程度的影响；储层泊松比与杨氏模量对交错裂缝延伸幅度却不明显。

关键词: 非常规储层, 水力压裂, 天然裂缝, 诱导应力, 位移不连续方法, 裂缝延伸

Abstract:

The fracture-network fracturing or staged fracturing reformation technology for unconventional and tight reservoirs focuses on the scientific problem about the staggered extension of hydraulic fracture and natural fracture. To better control the extension azimuth of hydraulic fracture and achieve the optimal fracture network state, a two-dimensional fracture extension calculation model was built based on displacement discontinuity and element superposition principle, so as to conduct the quantitative simulation research on the staggered extension laws of a hydraulic fracture and a natural fracture under the conditions of different dip angles, intervals and stresses. The research results show that fracture intervals and dip angles can greatly affect the fracture extension amplitude. When the interval between natural fracture and fracturing fissure is greater than 1 m and the dip angle is less than 70°, the fracturing fissure will force the natural fracture to turn and extend until intersection. Principal stress ratio has an effect on the extension amplitude of staggered fracture to some extent. However, the Poisson's ratio and Young's modulus have insignificant influences on the extension amplitude of staggered fractures.

Key words: unconventional reservoirs, hydraulic fracturing, natural fracture, induced stress, displacement discontinuity method, fracture extension

中图分类号:

TE357.1

刘顺, 何衡, 赵倩云, 周德胜. 水力裂缝与天然裂缝交错延伸规律[J]. 石油学报, 2018, 39(3): 320-326,334.

Liu Shun, He Heng, Zhao Qianyun, Zhou Desheng. Staggered extension laws of hydraulic fracture and natural fracture[J]. Acta Petrolei Sinica, 2018, 39(3): 320-326,334.

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水力裂缝与天然裂缝交错延伸规律

Staggered extension laws of hydraulic fracture and natural fracture

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