全过程下钻速度对地层裂缝宽度影响

赵世贵; 孔祥伟; 钟森

doi:10.21656/1000-0887.460178

全过程下钻速度对地层裂缝宽度影响

doi: 10.21656/1000-0887.460178

赵世贵^{1, 2,},
孔祥伟^{1, 2, ,},
钟森³

1.
长江大学石油工程学院, 武汉 430100
2.
油气钻完井技术国家工程研究中心(长江大学), 武汉 430100
3.
重庆渝浮能源发展有限公司, 重庆 400000

基金项目:

“十五五”新型油气勘探开发国家科技重大专项 SQ2025AAA120076

详细信息

作者简介:
赵世贵(1989—)，男，博士生(E-mail: zhao_shigui.stu@yangtzeu.edu.cn)

通讯作者:
孔祥伟(1982—)，男，博士，教授，博士生导师(通信作者. E-mail: 76922591@qq.com)

中图分类号: O39
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- 被引次数: 0
出版历程
- 收稿日期: 2025-09-20
- 修回日期: 2025-11-11
- 刊出日期: 2026-08-01

Effects of Entire Process Tripping-in Speeds on Formation Fracture Widths During the Entire Process

Zhao Shigui^{1, 2
,},
Kong Xiangwei^{1, 2
, ,},
Zhong Sen³

1.
School of Petroleum Engineering, Yangtze University, Wuhan 430100, P.R. China
2.
National Engineering Research Center for Oil & Gas Drilling and Completion Technology(Yangtze University), Wuhan 430100, P.R. China
3.
Chongqing Yufu Energy Development Co., Ltd., Chongqing 400000, P.R. China

摘要

摘要: 下钻速度通过影响井筒有效压力而引起地层裂缝宽度变化，造成井漏隐患. 结合下钻井深、钻具组合、地层岩石物理参数、钻井液性能，考虑下钻速度和钻井液可压缩系数等参数，建立了井筒压力瞬变与裂缝变形耦合作用的数学模型. 模型采用有限元-有限体积耦合方法进行求解，并利用四川盆地威远区块自X井龙马溪组硬脆性页岩地层数据验证了其可靠性. 结果表明：①下钻速度从0.5 m/s增加到2.0 m/s时，井筒压力从86.0 MPa增加到106.6 MPa，裂缝宽度从0.478 mm增加到0.881 mm. ②裂缝宽度随下钻井深、钻柱环空比的增加而增加. 下钻速度为0.5 m/s时，下钻井深从1 500 m增加到5 500 m，裂缝宽度从0.432 mm增加到0.478 mm；钻柱环空比从0.59增加到0.65，裂缝宽度从0.463 mm增加到0.487 mm. ③下钻速度从0增加到1.5 m/s，下钻井深为1 500 m时，裂缝宽度从0.4 mm增加到0.474 mm；下钻井深增加到5 500 m时，裂缝宽度从0.5 mm增加到0.624 mm；裂缝宽度随下钻速度增加而增加，下钻速度超过1.0 m/s后，增加趋势更加显著；且随着下钻井深增加，裂缝宽度的增加幅度越大. 本研究为优化下钻操作参数提供了理论依据，对预防钻井过程中的井漏事故具有重要指导意义.
- 下钻速度 /
- 裂缝宽度 /
- 井筒压力 /
- 流-固耦合
Abstract: The tripping-in speed affects the wellbore effective pressure, leading to changes in formation fracture widths and posing a risk of mud loss. The tripping-in speed and drilling fluid compressibility, along with the well depth, the bottom-hole assembly, the formation petrophysical parameters, and the drilling fluid properties were incorporated to build a mathematical model coupling wellbore pressure transients and fracture deformation. The model was solved with the finite element-finite volume coupling method and validated with data from the hard-brittle shale formation of the Longmaxi formation in the Zi X well of the Weiyuan Block in the Sichuan Basin. The results show that, i. when the tripping-in speed increase from 0.5 m/s to 2.0 m/s, the wellbore pressure will increase from 86.0 MPa to 106.6 MPa, while the fracture width will rise from 0.478 mm to 0.881 mm. ii. Bigger fracture widths go with greater tripping-in depths and higher drill string annular ratios. At a tripping-in speed of 0.5 m/s, when the tripping depth increases from 1 500 m to 5 500 m, the fracture width will rise from 0.432 mm to 0.478 mm; when the drill string annular ratio increases from 0.59 to 0.65, the fracture width will rise from 0.463 mm to 0.487 mm. iii. As the tripping-in speed increases from 0 to 1.5 m/s, at a tripping depth of 1 500 m, the fracture width will rise from 0.4 mm to 0.474 mm; at a tripping depth of 5 500 m, the fracture width will rise from 0.5 mm to 0.624 mm. Bigger fracture widths go with higher tripping-in speeds, and the rising trend will be more pronounced once the tripping-in speed exceeds 1.0 m/s; further, this rise becomes more pronounced with greater tripping depths. This study provides a theoretical basis for optimizing tripping-in operation parameters and offers an important guidance for preventing mud loss incidents during drilling.
- tripping-in speed /
- fracture width /
- wellbore pressure /
- fluid-solid coupling

HTML全文

图 1 井筒压力与裂缝宽度相互作用关系

Figure 1. The interaction between the wellbore pressure and the fracture width

下载: 全尺寸图片幻灯片

图 2 流-固耦合迭代技术路线

Figure 2. The technical workflow of fluid-solid coupling iteration

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图 3 下钻速度曲线

Figure 3. The tripping-in speed curves

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图 4 不同下钻速度下的井筒压力变化

Figure 4. Variations of the wellbore pressure under different tripping-in speeds

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图 5 不同下钻速度下的裂缝宽度变化

Figure 5. Variations of the fracture width under different tripping-in speeds

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图 6 不同下钻井深下的裂缝宽度变化

Figure 6. Variations of the fracture width at different tripping depths

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图 7 不同钻具组合与裂缝宽度变化

Figure 7. The variations of the fracture width with different BHA configurations

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图 8 全过程下钻速度与裂缝宽度变化

Figure 8. Variations of the fracture width during the entire tripping-in process

下载: 全尺寸图片幻灯片

表 1 井筒压力计算结果与现场实测结果对比

Table 1. Comparison of the wellbore pressure between calculated results and field measured results

tripping-in speed/(m/s)	measured result/MPa	calculated result/MPa	relative error/%
0.1	86.1	82.8	3.8
0.2	87.3	83.5	4.4
0.3	87.8	84.1	4.2
0.4	88.5	84.7	4.3

下载: 导出CSV

表 2 各钻具组合环空比

Table 2. Annular ratios of different bottom hole assemblies(BHA)

BHA	drill collar annular ratio	drill pipe annular ratio
1	0.76	0.59
2	0.76	0.65
3	0.81	0.68

下载: 导出CSV

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