[1]周彤,张士诚,邹雨时,等.四川盆地东北缘强应力大倾角页岩储层水力压裂裂缝形态[J].新疆石油地质,2016,(03):336.[doi:10.7657/XJPG20160318]
 ZHOU Tong,ZHANG Shicheng,ZOU YushiLI Ning,et al.Hydraulic Fracture Geometry of Shale Gas Reservoirs with Strong Tectonic Stress and Large Dip Angle in Northeastern Margin of Sichuan Basin[J].Xinjiang Petroleum Geology,2016,(03):336.[doi:10.7657/XJPG20160318]
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四川盆地东北缘强应力大倾角页岩储层水力压裂裂缝形态()
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《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

卷:
期数:
2016年03期
页码:
336
栏目:
出版日期:
2016-06-01

文章信息/Info

Title:
Hydraulic Fracture Geometry of Shale Gas Reservoirs with Strong Tectonic Stress and Large Dip Angle in Northeastern Margin of Sichuan Basin
文章编号:
1001-3873(2016)03-0336-06
作者:
周彤1张士诚1邹雨时1李宁1郑永华2
(1.中国石油大学 石油工程学院,北京 102249;2.斯伦贝谢中渝页岩气技术服务(重庆)有限公司 ,重庆 400043)
Author(s):
ZHOU Tong1 ZHANG Shicheng1 ZOU Yushi1LI Ning1 ZHENG Yonghua2
(1.School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;2.Schlumberger Zhongyu Shale Gas Technical Services(Chongqing), Chongqing 400043, China)
关键词:
四川盆地东北缘页岩气大倾角强构造应力水力压裂裂缝形态数值模拟
Keywords:
Sichuan basin northeastern margin shale gas large dip angle strong tectonic stress hydraulic fractureing fracture geometrynumerical simulation
分类号:
TE45
DOI:
10.7657/XJPG20160318
文献标志码:
A
摘要:
四川盆地东北缘山区页岩储层构造应力强,地层倾角大,层理和天然裂缝高度发育,储层改造中水力压裂裂缝展布的不确定性十分明显。基于有限元和离散元混合方法,引入横观各向同性本构关系表征层状页岩,建立了三维复杂裂缝扩展模型。应用此模型分析了地应力差、压裂液黏度、注入速率、天然裂缝等因素对压裂后裂缝的影响。模拟结果表明:垂向应力与最小水平主应力差越高,越有利于垂直裂缝的产生,当应力差为5 MPa时,适当提高压裂液黏度和注入速率,有利于降低层理对裂缝扩展的限制,增加垂直裂缝比例,提高储层垂向改造效果;页岩中无优势走向天然裂缝越发育,强应力差条件下产生的剪切破裂裂缝数量也越多。
Abstract:
Hydraulic fractures are distributed irregularly due to strong tectonic stress, large dip angle formation, highly developed bedding and natural fissures of shale gas reservoirs in northeastern margin of Sichuan basin. Based on finite?element and discrete?element combined method, the transverse isotropic constitutive relations are introduced to represent lamellar shale and a 3D complex fracture propagation model has been established. Then the model is used to analyze several important parameters which could influence the fractures after stimulation, such as in?site stress difference, fracturing fluid viscosity, injection rate and natural fracture, etc. The modeling result shows that the larger the difference between vertical stress and the minimum horizontal principle stress is, the easier the vertical fractures will occur. Under the condition of the low differential stress (5 MPa), increasing fracturing fluid viscosity and injection rate is more likely to decrease the limit of bedding to fracture propagation, increase vertical fractures and improve vertical stimulation effect. The more developed the natural fractures without advantageous strikes in shale, the more the shear fractures will be under strong tectonic stress differences

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更新日期/Last Update: 2016-05-24