Numerical simulation of proppant migration and distribution in complex fractures

被引：0

作者：

Guo T. ^{[1
]}

Gong Y. ^{[2
]}

Liu X. ^{[1
,3
]}

Wang Z. ^{[2
]}

Xu J. ^{[1
]}

Sheng M. ^{[4
]}

Chen M. ^{[1
]}

Luo Z. ^{[1
]}

机构：

[1] School of Petroleum Engineering in China University of Petroleum (East China), Qingdao

[2] Shengli Oilfield Company, SINOPEC, Dongying

[3] School of Earth and Space Sciences, Peking University, Beijing

[4] School of Petroleum Engineering, China University of Petroleum(Beijing), Beijing

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2022年 / 46卷 / 03期

关键词：

CFD-DEM; complex fractures; hydraulic fracturing; proppant migration;

D O I：

10.3969/j.issn.1673-5005.2022.03.010

中图分类号：

学科分类号：

摘要：

In the fracturing process of reservoirs with natural fractures, it is easy to form complex fracture networks after the main fracture connected with the natural microfractures, which can make the placement of proppants difficult and will seriously affect the performance of the fracturing. In this study, a three-dimensional model of complex fractures was established using a CFD-DEM coupling method considering precisely captured particle movement. The effects of injection velocity, fracturing fluid viscosity and proppant density on proppant migration and placement in complex fractures were investigated, in which branching fractures with various positions, angle and progression were considered. The simulation results show that the position and angle of the branch fracture determines the proportion of proppant entering the branch fracture. For the same injection time, the area of sand embankment located at the 1/3 section of the main fracture is twice that of the 2/3 section of the main fracture, and the area of sand embankment located at 30° branch fracture is 3. 2 times that of 150° branch fracture. For multi-stage branch fracturing, the shape of the sand embankment in the second level fractures is parabola, and the shape of the sand embankment in the third level fractures is triangle. The higher the fracture complexity, the greater the total diverging effect of the branch fractures, and the higher the balance height of the sand embankment in the main fractures. The results of fracturing process optimization considering proppant transport and settlement show that combinations of high flow rates (greater than 0. 4 m/s), linear glue, low proppant density(less than 2000 kg/m3), low injection flow rate (0. 2 m/s),slick water and high proppant density (3000 kg/m3) can ensure a good proppant displacement at near wellbore fractures and increase the placement area in the distal and branch fractures. © 2022 University of Petroleum, China. All rights reserved.

引用

页码：89 / 95

页数：6

共 18 条

[1] ENGELDER T, LASH G G., Marcellus shale play̍s vast resource potential creating stir in appalachia[J], The American Oil and Gas Reporter, 51, 1, pp. 76-87, (2008)
[2] ZHAO Jinzhou, WANG Song, LI Yongming, Difficulties and key techniques in the fracturing treatment of shale gas reservoirs, Natural Gas Industry, 32, 4, pp. 46-49, (2012)
[3] PAN Linhua, ZHANG Ye, WANG Haibo, Et al., Mechanism study on proppants division during shale complex fracturing of shale rocks, Journal of China University of Petroleum(Edition of Natural Science), 44, 1, pp. 61-70, (2020)
[4] GUO Tiankui, ZHANG Shicheng, WANG Lei, Et al., Selection of proppant size in frac and pack treatment on unconsolid sandstone reservoir, Journal of China University of Petroleum(Edition of Natural Science), 36, 1, pp. 94-100, (2012)
[5] LU Yunxiao, GUO Jianchun, Application of slug-style sand fracture technology in seam net fracturing of shale gas, Well Testing, 23, 5, pp. 67-69, (2014)
[6] SAHAI R., Laboratory evaluation of proppant transport in complex fracture systems, (2012)
[7] WEN Q, WANG S, DUAN X, Et al., Experimental investigation of proppant settling in complex hydraulic-natural fracture systems in shale reservoirs[J], Journal of Natural Gas Science & Engineering, 33, pp. 70-80, (2016)
[8] LI N, LI J, ZHAO L, Et al., Laboratory testing and numeric simulation on laws of proppant transport in complex fracture systems, (2016)
[9] HUANG Zhiwen, SU Jianzheng, LONG Qiulian, Et al., Numerical simulation on the flowing rules of carrying fluids based on fluent software, Journal of Oil and Gas Technology, 34, 11, pp. 123-130, (2012)
[10] WEN Qingzhi, DUAN Xiaofei, ZHAN Yongping, Et al., Study on settlement and migration law of proppant in complex fracture network, Journal of Xi̍an Shiyou University (Natural Science Edition), 31, 1, pp. 79-84, (2016)

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