基于扩展有限元的页岩水平井多裂缝模拟研究

陈军斌; 魏波; 谢青; 王汉青; 李涛涛; 王浩

doi:10.3879/j.issn.1000-0887.2016.01.006

基于扩展有限元的页岩水平井多裂缝模拟研究

doi: 10.3879/j.issn.1000-0887.2016.01.006

西安石油大学石油工程学院, 西安 710065

基金项目: 国家自然科学基金（51374170）

详细信息

作者简介:
陈军斌（1963—），男，教授，博士（E-mail: chenjbxu@126.com）;魏波（1987—），男，硕士生（通讯作者. E-mail: xysuweibo131010097@163.com）.

中图分类号: TE357;O343.1
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出版历程
- 收稿日期: 2015-07-08
- 修回日期: 2015-10-09
- 刊出日期: 2016-01-16

Simulation of Multi-Hydrofracture Horizontal Wells in Shale Based on the Extended Finite Element Method

College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, P.R.China

Funds: The National Natural Science Foundation of China(（51374170)

摘要

摘要: 页岩储层水平井分段多簇压裂簇间距优选是压裂技术的关键，建立了水力压裂流固耦合数学模型，基于扩展有限单元法模拟多条裂缝的扩展过程，研究多条裂缝同时扩展的转向规律，以及应力干扰、水平主应力差、裂缝间距等因素与裂缝转向角度的关系.结果表明：应力干扰作用对裂缝宽度具有限制作用，单条裂缝张开宽度比两条裂缝的大；裂缝转角随应力差的减小而增大，随压裂时间的增加而增大.簇间距越小，应力干扰越强，转角越大，综合主缝均匀扩展、支撑剂填充以及复杂裂缝网络形成等条件，确定最优簇间距为30～40 m.多条裂缝同时扩展时，中间裂缝会受到两边裂缝的限制作用，簇间距越小，限制作用越强，裂缝发育时间越长，扩展速度越慢.
- 页岩储层 /
- 水平井 /
- 分段多簇水力压裂 /
- 扩展有限元 /
- 裂缝干扰
Abstract: The cluster spacing optimization of segmented multi-cluster hydrofracture of horizontal wells makes a key point for the hydrofracturing technology in shale reservoir. The fluid-solid coupling mathematical model for the horizontal well hydrofracture was established. Based on the extended finite element method, the propagation process of multiple cracks was simulated. The turning law of simultaneously propagating multiple cracks, as well as the relationships between the stress interference, horizontal principal stress difference, fracture spacing and the crack turning angle, were studied. The results show that the stress interference has restrictive effects on the crack width, and the opening width of 1 single crack is 1.3 times that of 2 concomitant cracks. The crack turning angle increases with the decrease of the stress difference and the lengthening of the fracturing time. The smaller the cluster spacing is, the stronger the stress interference is and the greater the crack turning angle is. For the sake of uniform propagation of the primary fracture, easy packing of the proppant and effective formation of the complex crack network, the optimal cluster spacing is determined as 30 m to 40 m. In the case of the multiple simultaneously propagating cracks, the middle cracks are restricted by those on both sides. The smaller the cluster spacing is, the stronger the restriction is, which results in a longer time of crack development and a lower propagation rate.
- shale reservoir /
- horizontal well /
- segmented multi-cluster hydrofracture /
- extended finite element method /
- crack interference

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参考文献(18)

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基于扩展有限元的页岩水平井多裂缝模拟研究

doi: 10.3879/j.issn.1000-0887.2016.01.006

作者简介:
陈军斌（1963—），男，教授，博士（E-mail: chenjbxu@126.com）;魏波（1987—），男，硕士生（通讯作者. E-mail: xysuweibo131010097@163.com）.

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Simulation of Multi-Hydrofracture Horizontal Wells in Shale Based on the Extended Finite Element Method

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基于扩展有限元的页岩水平井多裂缝模拟研究

doi: 10.3879/j.issn.1000-0887.2016.01.006

作者简介: 陈军斌（1963—），男，教授，博士（E-mail: chenjbxu@126.com）;魏波（1987—），男，硕士生（通讯作者. E-mail: xysuweibo131010097@163.com）.

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出版历程

Simulation of Multi-Hydrofracture Horizontal Wells in Shale Based on the Extended Finite Element Method

计量

出版历程

目录

作者简介:
陈军斌（1963—），男，教授，博士（E-mail: chenjbxu@126.com）;魏波（1987—），男，硕士生（通讯作者. E-mail: xysuweibo131010097@163.com）.