页岩储层水平扩径井段固井顶替效率数值模拟研究

doi:10.3969/j.issn.1006-6535.2023.04.017

特种油气藏 ›› 2023, Vol. 30 ›› Issue (4): 139-145.DOI: 10.3969/j.issn.1006-6535.2023.04.017

页岩储层水平扩径井段固井顶替效率数值模拟研究

孙晓峰^1,2, 陶亮^1,2, 朱志勇³, 于福锐², 孙铭浩², 赵元喆², 曲晶瑀^1,2

1.东北石油大学三亚海洋油气研究院,海南三亚 572000;
2.东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆 163318;
3.中国石油华北石油管理局有限公司,河北廊坊 065000

收稿日期:2022-11-13 修回日期:2023-04-22 出版日期:2023-08-25 发布日期:2023-09-18
作者简介:孙晓峰(1980—),男,教授,博士生导师,2005年毕业于大庆石油学院油气储运工程专业,2014年毕业于东北石油大学石油与天然气工程专业,获博士学位,现从事油气井流体力学方面的教学与研究工作。
基金资助:
国家自然科学基金“基于环空固液两相瞬态流动特性研究页岩气水平井卡钻事故的诱发机制”(52174002);海南省重点研发计划项目“深水大位移井液力磁传动井眼清洁工具研发与应用”(ZDYF2022SHFZ063)

Study on Numerical Simulation of Cementing Displacement Efficiency of Horizontal Expansion Well Sections in Shale Reservoir

Sun Xiaofeng^1,2, Tao Liang^1,2, Zhu Zhiyong³, Yu Furui², Sun Minghao², Zhao Yuanzhe², Qu Jingyu^1,2

1. Sanya Institute of Offshore Oil and Gas Research, Northeast Petroleum University, Sanya, Hainan 572000, China;
2. Key Laboratory for Improving Oil and Gas Recovery (Northeast Petroleum University), Ministry of Education, Daqing, Heilongjiang 163318, China;
3. CNPC Huabei Petroleum Limited, Langfang, Hebei 065000, China

Received:2022-11-13 Revised:2023-04-22 Online:2023-08-25 Published:2023-09-18

摘要/Abstract

摘要： 提高水平扩径井段顶替效率是提高水平井固井质量的途径之一,但相关研究存在假设过于理想化、与现场实际不相符的问题。为此,利用CFD数值模拟方法,以大庆油田古龙页岩储层为例,开展了椭圆形水平扩径井段固井水泥浆三维顶替模拟研究。结果表明:偏心度越高,扩径段的宽窄间隙处的流速差越显著,偏心度为0.7时,流速差达到2.00 m/s,钻井液很难被完全顶替;最大扩径段位于扩径段中部时,水泥浆顶替效率最高,扩径段靠近最大扩径处一侧时,水泥浆顶替效率变差,易形成钻井液滞流区;套管高偏心度条件下,顶替效率随套管转速增加显著改善,偏心度为0.7时,套管转速从30 r/min增至40 r/min,顶替效率提高1.17个百分点;主轴旋转会改变扩径段的几何形状,主轴方位角为60~120 °时,顶替效率变化明显,由60 °增至90 °时,顶替效率降低0.81个百分点。该研究结果有助于提高页岩储层椭圆形水平扩径井段的固井质量。

关键词: 顶替效率, 扩径井段, 水平井, 固井质量, 水泥浆, 古龙页岩, 大庆油田

Abstract: Improving the displacement efficiency of horizontal expansion well section is one of the ways to improve the quality of horizontal well cementing, but the relevant study assumptions are too ideal and do not match the actual situation in the field. For this reason, a three-dimensional displacement simulation study of cementing slurry in elliptical horizontal expansion well section was carried out by using CFD numerical simulation method and taking Gulong Shale Reservoir as an example. The result shows that the higher the eccentricity, the more significant the flow velocity difference at the wide and narrow gap of the expansion well section, and when the eccentricity was 0.7, the flow velocity difference reached 2.00 m/s, which made it difficult for drilling fluid to be completely displaced.When the maximum expansion well section was located in the middle of the expansion section, the cement slurry displacement efficiency was the highest, and when the expansion section was close to one side of maximum expansion section, the cement slurry displacement efficiency became poor, and it was easy to form a drilling fluid stagnation zone.Under the condition of high casing eccentricity, the displacement efficiency improved significantly with the increase of casing speed, and when the eccentricity was 0.7, the casing speed increased from 30 r/min to 40 r/min, and the displacement efficiency increased by 1.17 percentage points; the spindle rotation changed the geometry of the expansion well section, and the displacement efficiency changed significantly when the spindle azimuth was 60-120 °, and decreased by 0.81 percentage points when the spindle azimuth increased from 60 ° to 90 °. The study results can help to improve the cementing quality of elliptical horizontal expansion well sections in shale reservoirs.

Key words: displacement efficiency, expansion well section, horizontal well, cementing quality, cement slurry, Gulong Shale, Daqing Oilfield

中图分类号:

TE256

孙晓峰, 陶亮, 朱志勇, 于福锐, 孙铭浩, 赵元喆, 曲晶瑀. 页岩储层水平扩径井段固井顶替效率数值模拟研究[J]. 特种油气藏, 2023, 30(4): 139-145.

Sun Xiaofeng, Tao Liang, Zhu Zhiyong, Yu Furui, Sun Minghao, Zhao Yuanzhe, Qu Jingyu. Study on Numerical Simulation of Cementing Displacement Efficiency of Horizontal Expansion Well Sections in Shale Reservoir[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 139-145.

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页岩储层水平扩径井段固井顶替效率数值模拟研究

Study on Numerical Simulation of Cementing Displacement Efficiency of Horizontal Expansion Well Sections in Shale Reservoir

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