Special Oil & Gas Reservoirs >

2024 , Vol. 31 >Issue 5: 168 - 174

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.05.020

Drilling & Production Engineering

Research on Wellbore Collapse Instability Areas in Stratified Shale Oil Reservoirs

  • Zhang Haijun ,
  • Wang Lihui ,
  • Zhang Ligang ,
  • Jing Haiquan ,
  • Yang Yanyun ,
  • Qu Yonglin ,
  • Liu Zhaoyi ,
  • Liu Yueqiu
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  • 1. PetroChina Dagang Oilfield Company,Tianjin 300280,China;
    2. Northeast Petroleum University,Daqing,Heilongjiang 163318,China

Received date: 2023-05-26

  Revised date: 2024-07-04

  Online published: 2024-12-24

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Abstract

During the drilling process of stratified shale oil reservoirs,if the wellbore stability is not well enough,it is prone to frequent incidents such as wellbore collapse and stuck pipe.A numerical model for the stress around the wellbore and a collapse zone prediction method in shale oil reservoir is developed to reveal the influence of bedding plane on wellbore collapse and enlargement of shale oil reservoir in accordance with MG-C strength criterion and multi-weak plane criterion.Also,the collapse and enlargement patterns for single and multiple weak planes under different stress mechanisms are calculated.The results show that the presence of multiple weak planes causes simultaneous damage to the matrix and weak planes,leading to more complex wellbore collapse patterns.While collapse expansion induced by weak planes is significantly higher than that of the matrix.Compared to the strike-slip stress mechanism,the collapse of wellbore under normal stress mechanisms shows a more significant change with stress ratio,and the collapse risk is higher.Under normal stress mechanisms,when the stress ratio exceeds 1.5,the wellbore expansion rate exceeds 100% and wellbore increases sharply.The research findings provide theoretical guidance for preventing wellbore collapse during drilling in shale oil reservoirs under different regional stress mechanisms.

Key words： shale oil; bedding; failure criteria; borehole wall; collapse and stuck pipe; weak plane

Cite this article

Zhang Haijun , Wang Lihui , Zhang Ligang , Jing Haiquan , Yang Yanyun , Qu Yonglin , Liu Zhaoyi , Liu Yueqiu . Research on Wellbore Collapse Instability Areas in Stratified Shale Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2024 , 31(5) : 168 -174 . DOI: 10.3969/j.issn.1006-6535.2024.05.020

References

[1] 姜在兴,张建国,孔祥鑫,等.中国陆相页岩油气沉积储层研究进展及发展方向[J].石油学报,2023,44(1):45-71.
JIANG Zaixing,ZHANG Jianguo,KONG Xiangxin,et al.Research progress and development direction of continental shale oil and gas deposition and reservoirs in China[J].Acta Petrolei Sinica,2023,44(1):45-71.
[2] 邹才能,朱如凯,董大忠,等.页岩油气科技进步、发展战略及政策建议[J].石油学报,2022,43(12):1675-1686.
ZOU Caineng,ZHU Rukai,DONG Dazhong,et al.Scientific and technological progress,development strategy and policy suggestion regarding shale oil and gas[J].Acta Petrolei Sinica,2022,43(12):1675-1686.
[3] 王倩茹,陶士振,关平.中国陆相盆地页岩油研究及勘探开发进展[J].天然气地球科学,2020,31(3):417-427.
WANG Qianru,TAO Shizhen,GUAN Ping.Progress in research and exploration&development of shale oil in continental basins in China[J].Natural Gas Geoscience,2020,31(3):417-427.
[4] 孙川翔,聂海宽,苏海琨,等.温压耦合作用下四川盆地深层龙马溪组页岩孔渗和岩石力学特征[J].石油勘探与开发,2023,50(1):77-88.
SUN Chuanxiang,NIE Haikuan,SU Haikun,et al.Porosity,permeability and rock mechanics of Lower Silurian Longmaxi Formation deep shale under temperature-pressure coupling in the Sichuan Basin,SW China[J].Petroleum Exploration and Development,2023,50(1):77-88.
[5] 刘峻杰,吴建军,熊健,等.海陆过渡相不同页岩岩相的岩石力学特性及能量演化特征[J].特种油气藏,2022,29(6):83-90.
LIU Junjie,WU Jianjun,XIONG Jian,et al.Rock mechanical properties and energy evolution characteristics of different shale lithofacies in marine-continental transition facies[J].Special Oil&Gas Reservoirs,2022,29(6):83-90.
[6] 刘海龙,谢涛,张磊,等.层理地层基质与弱面坍塌失稳规律分析[J].西南石油大学学报(自然科学版),2021,43(2):128-137.
LIU Hailong,XIE Tao,ZHANG Lei,et al.Analysis of collapse matrix and weak plane of bedding strata[J].Journal of Southwest Petroleum University (Science & Technology Edition),2021,43(2):128-137.
[7] 刘向君,曾韦,梁利喜,等.龙马溪组页岩地层井壁坍塌周期预测[J].特种油气藏,2016,23(5):130-133.
LIU Xiangjun,ZENG Wei,LIANG Lixi,et al.Prediction of wellbore collapse period in Longmaxi shale formation[J].Special Oil & Gas Reservoirs,2016,23(5):130-133.
[8] WESTERGARD H M. Plastic state of stress around a deep well[J].Journal of Boston Society Civil Engineers,1940,17:1-5.
[9] JAEGER J C.Shear failure of anistropic rocks[J].Geological Magazine,1960,97(1):65-72.
[10] LEE H,ONG SH,AZEEMUDDIN M,et al.A wellbore stability model for formations with anisotropic rock strengths[J].Journal of Petroleum Science and Engineering,2012,96:109-119.
[11] JAEGER J C.Shear failure of anistropic rocks[J].Geological Magazine,1960,97(1):65-72.
[12] 邓金根,张洪生.钻井工程中井壁失稳的力学机理[M].北京:石油工业出版社,1998:3-80.
DENG Jingen,ZHANG Hongsheng.Mechanical mechanism of wellbore instability in drilling engineering[M].Beijing:Petroleum Industry Press,1998:3-80.
[13] 刘玉石.地层坍塌压力及井壁稳定对策研究[J].岩石力学与工程学报,2004,23(14):2421-2423.
LIU Yushi.Collapse pressure and precautions for stability of wellbore wall[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(14):2421-2423.
[14] 金衍,陈勉,陈治喜,等.弱面地层的直井井壁稳定力学模型[J].钻采工艺,1999,22(3):13-14,97.
JIN Yan,CHEN Mian,CHEN Zhixi,et al.Mechanical model for wellbore stability of vertical wells in weak plane formations[J].Drilling & Production Technology,1999,22(3):13-14,97.
[15] 金衍,陈勉,柳贡慧,等.弱面地层斜井井壁稳定性分析[J].石油大学学报(自然科学版),1999,4(23):46-48.
JIN Yan,CHEN Mian,LIU Gonghui,et al.Analysis on borehole stability of weak-face formation in directional wells[J].Journal of Petroleum University (Edition of Natural Science),1999,23(4):46-48.
[16] 丁乙,刘向君,罗平亚,等.弱面结构对页岩地层井壁稳定性影响研究[J].地下空间与工程学报, 2018,14(4):1130-1136.
DING Yi,LIU Xiangjun,LUO Pingya,et al.Influence of weak plane on wellbore stability in shale formation[J].Chinese Journal of Underground Space and Engineering,2018,14(4):1130-1136.
[17] 唐川富,李忠慧,陈晗,等.考虑多弱面的非连续煤夹层井壁坍塌模型与规律分析[J].钻采工艺,2022,45(5):8-15.
TANG Chuanfu,LI Zhonghui,CHEN Han,et al.Shaft collapse model and law analysis of discontinuous coal interlayer with multi-weakness[J].Drilling & Production Technology,2022,45(5):8-15.
[18] ZHANG L,CAO P,RADHA KC.Evaluation of rock strength criteria for wellbore stability analysis[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(8):1304-1316.
[19] YOUNGSOO S,SUNGJUN J,YOONSU N,et al.Geomechanical challenges during geological CO2 storage:a review[J].Chemical Engineering Journal,2023,456:140968.
[20] MOGI K.Fracture and flow of rocks under high triaxial compression[J].Journal of Geophysical Research,1971,76(5):1255-1269.
[21] AL-AJMI A M,ZIMERMAN R W.Relation between the Mogi and the Coulomb failure criteria[J].International Journal of Rock Mechanics and Mining Sciences,2005,42(3):432-439.
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