基于CFD-DEM方法的迂曲裂缝中支撑剂运移关键影响因素分析

王雪飞; 王素玲; 侯峰; 王明; 李雪梅; 孙丹丹

doi:10.3969/j.issn.1006-6535.2022.06.019

特种油气藏 >

2022 , Vol. 29 >Issue 6: 150 - 158

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.06.019

钻采工程

基于CFD-DEM方法的迂曲裂缝中支撑剂运移关键影响因素分析

王雪飞 ,
王素玲 ,
侯峰 ,
王明 ,
李雪梅 ,
孙丹丹

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1.东北石油大学,黑龙江大庆 163318;
2.中国石油新疆油田分公司,新疆克拉玛依 834002;
3.中科院高能物理研究所,北京 100000;
4.散裂中子源科学中心,广东东莞 523000;
5.齐齐哈尔大学,黑龙江齐齐哈尔 161006;
6.中国石油大庆油田有限责任公司,黑龙江大庆 163514

王雪飞(1987—),女,讲师,2010年毕业于齐齐哈尔大学机械制造及其自动化专业,现为东北石油大学石油与天然气工程专业在读博士研究生,主要从事油气储层增产改造技术方面的研究。

收稿日期: 2022-04-15

修回日期: 2022-08-29

网络出版日期: 2023-01-10

基金资助

国家自然科学基金“颗粒群与流体以及压裂管柱的多物理场耦合动力学分析”(11972114);黑龙江省省属高等学校基本科研业务费科研项目“基于振动焊接的铁路货车用钢焊缝疲劳延寿工艺及机理”(145109123)

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Analysis on Key Influencing Factors of Proppant Migration in Tortuous Fractures Based on CFD-DEM Method

Wang Xuefei ,
Wang Suling ,
Hou Feng ,
Wang Ming ,
Li Xuemei ,
Sun Dandan

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1. Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
2. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834002, China;
3. Institute of High Energy Physics of the Chinese Academy of Sciences, Beijing 100000, China;
4. Spallation Neutron Source Science Center, Dongguan, Guangdong 523000, China;
5. Qiqihar University, Qiqihar, Heilongjiang 161006, China;
6. PetroChina Daqing Oilfield Co., Ltd., Daqing, Heilongjiang 163514, China

Received date: 2022-04-15

Revised date: 2022-08-29

Online published: 2023-01-10

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摘要

裂缝中支撑剂的运移和铺置是维持裂缝开放和增强裂缝导流能力的关键,但支撑剂在迂曲裂缝中的运移机理尚不明确。为此,基于计算流体力学原理,利用离散单元法建立支撑剂在迂曲裂缝中运移的数值模型,研究携砂液注入速度、压裂液砂比、支撑剂粒径等因素对迂曲裂缝中支撑剂运移铺置规律的影响。结果表明:裂缝迂曲度越大、支撑剂铺置距离越短,流速损失越大;在距裂缝入口20 mm处,与迂曲度为1.0的裂缝相比,迂曲度为1.2、1.5、2.0的裂缝中的流速损失率增大2.2、3.7、4.5倍;迂曲裂缝内支撑剂铺置距离随支撑剂注入速度的增大而增大,随压裂液砂比、支撑剂粒径的增大而缩短。该研究可为支撑剂在迂曲裂缝中运移的相关研究提供理论指导。

关键词： 迂曲裂缝; 支撑剂; 携砂液; 压裂; CFD-DEM方法; 流固耦合

本文引用格式

王雪飞 , 王素玲 , 侯峰 , 王明 , 李雪梅 , 孙丹丹 . 基于CFD-DEM方法的迂曲裂缝中支撑剂运移关键影响因素分析[J]. 特种油气藏, 2022 , 29(6) : 150 -158 . DOI: 10.3969/j.issn.1006-6535.2022.06.019

Abstract

The migration and displacement of proppant in fractures is the key to maintain fracture opening and enhance fracture conductivity, but the mechanism of proppant migration in tortuous fractures remains unclear. According to the principle of computational fluid dynamics, a numerical model of proppant migration in tortuous fractures was established by the discrete unit method to study the effects of proppant-carrying fluid injection rate, fracturing fluid-proppant ratio, proppant particle size and other factors on the migration and displacement of proppant in tortuous fractures. The result shows: The greater the tortuosity of the fracture, the shorter the proppant displacement distance and the greater the flow rate loss; at 20 mm from the fracture entrance, the flow rate loss rate in the fracture with tortuosity of 1.2, 1.5 and 2.0 was increases by 2.2, 3.7 and 4.5 times compared with that in the fracture with tortuosity of 1.0; the proppant displacement distance in the tortuous fracture increased with the increase of proppant injection rate, and decreased with the increase of fracturing fluid-proppant ratio and proppant particle size. This study can theoretically guide the study of proppant migration in tortuous fractures.

Key words： Tortuous fractures; proppant; proppant-carrying fluid; fracturing; CFD-DEM method; flow-solid coupling

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