页岩气储层井壁坍塌压力研究

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (943 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract Shale gas reservoir has strong anisotropy and wellbore instability is prone to occur. Wellbore stability model in gas shale was created based on transverse isotropic theory and single plane of weakness theory. Core samples of gas shale were tested to research the influence of drilling fluid on shale matrix strength and bedding plane strength. The influences of dip of bedding，drilling azimuth，drilling time and drilling fluid，etc. on collapsing pressure of horizontal wells were analyzed. The results show that when the dip of bedding is smaller than 45°，failure along the bedding plane will take place on the wellbore wall；when the dip of bedding is higher than 45°，failure in shale matrix will take place in some drilling azimuth；drilling horizontal wells near the direction of minimum horizontal stress may easily lead to wellbore collapsing；with the hole open time increasing，the collapsing pressure will raise gradually；and the failure mode of wellbore wall may change from the initial shale matrix failure into bedding plane failure；oil based mud is more positive for long-term wellbore stability than water based mud. The results can provide a reference for drilling in gas shale.

Key words： mining engineering shale gas horizontal well bedding transverse isotropy collapsing pressure weak plane failure

Received: 28 January 2013

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Cite this article:

URL:

https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I8/1595

[1] 邹才能，董大忠，王社教，等. 中国页岩气形成机制，地质特征及资源潜力[J]. 石油勘探与开发，2010，37(6)：641–653.(ZOU Caineng，DONG Dazhong，WANG Shejiao，et al. Geological characteristics，formation mechanism and resource potential of shale gas in China[J]. Petroleum Exploration and Development，2010，37(6)：641–653.(in Chinese)) [2] U. S. Energy Information Administration. Shale gas in the United States：recent developments and outlook[OL]. http：//www. Eia. Gov/ reports，2012. [3] LEKHNITSKII S G. Theory of elasticity of an anisotropic elastic body[M]. [S. l.]：Holden-Day，1963：38–182. [4] AMADEI B. Rock anisotropy and the theory of stress measurements[M]. [S. l.]：Springer-Verlag，1983：55–276. [5] KARPFINGER F，PRIOUL R，GAEDE O，et al. Revisiting borehole stresses in anisotropic elastic media：comparison of analytical versus numerical solutions[C]// The 45th US Rock Mechanics/Geomechanics Symposium. [S. l.]：[s. n.]，2011：261–273. [6] AADNOY B. Modeling of the stability of highly inclined boreholes in anisotropic rock formations[J]. SPE Drilling Engineering，1988，3(3)：259–268. [7] ONG S H. Borehole stability[PH. D. Thesis][D]. Oklahoma：University of Oklahoma，1994. [8] ONG S，ROEGIERS J C. Fracture initiation from inclined wellbores in anisotropic formations[C]// International Meeting on Petroleum Engineering. [S. l.]：[s. n.]，1995：423–435. [9] YAMAMOTO K，SHIOYA Y，URYU N. Discrete element approach for the wellbore instability of laminated and fissured rocks[C]// SPE/ISRM Rock Mechanics Conference. [S. l.]：[s. n.]，2002：1–9. [10] 蔚宝华. 层理性泥页岩地层井壁失稳力学机制研究[博士学位论文][D]. 北京：中国石油大学，2006.(YU Baohua. Study on borehole unstable mechanism of layered shale[PH. D. Thesis][D]. Beijing：China University of Petroleum，2006.(in Chinese)) [11] 袁俊亮，邓金根，蔚宝华，等. 页岩气藏水平井井壁稳定性研究[J]. 天然气工业，2012，32(9)：66–70.(YUAN Junliang，DENG Jingen，YU Baohua，et al. Wellbore stability of horizontal wells in shale gas reservoirs[J]. Natural Gas Industry，2012，32(9)：66–70.(in Chinese)) [12] LI Y，FU Y，TANG G，et al. Effect of weak bedding planes on wellbore stability for shale gas wells[C]// IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition. [S. l.]：[s. n.]，2012：1–8. [13] SUAREZ-RIVERA R，GREEN S，HANDWERGER D，et al. Accounting for heterogeneity provides a new perspective for completions in tight gas Shales[C]// Alaska Rocks 2005，The 40th US Symposium on Rock Mechanics(USRMS). [S. l.]：[s. n.]，2005：750–758. [14] LINGS M L，PENNINGTONF D S，NASH D F T. Anisotropic stiffness parameters and their measurement in a stiff natural clay[J]. Geotechnique，2000，50(2)：109–125. [15] HIGGINS S，GOODWIN S，Donald，et al. Anisotropic stress models improve completion design in the Baxter Shale[C]// SPE Annual Technical Conference and Exhibition. [S. l.]：[s. n.]，2008：1–10. [16] CHENEVERT M E. The deformation-failure characteristics of laminated sedimentary rocks[M]. Texas：University of Texas Press，1964：87–123. [17] OKLAND D，COOK J M. Bedding-related borehole instability in high-angle wells[C]// SPE/ISRM Rock Mechanics in Petroleum Engineering. [S. l.]：[s. n.]，1998：413–422 [18] HILL R. The mathematical theory of plasticity[M]. Oxford：Oxford University Press，1998：122–187. [19] GOL?DENBLAT I I，KOPNOV V A. Strength of glass-reinforced plastics in the complex stress state[J]. Mechanics of Composite Materials，1965，1(2)：54–59. [20] JAEGER J C. Shear failure of anisotropic rocks[J]. Geological Magazine，1960，97：65–72. [21] MCLAMORE R，GRAY K E. The mechanical behavior of anisotropic sedimentary rocks[J]. Journal of Engineering for Industry，1967，89(1)：62–73. [22] WALSH J B，BRACE W F. A fracture criterion for brittle anisotropic rock[J]. Journal of Geophysical Research，1964，69(16)：3 449–3 456. [23] KARR D G，LAW F P，FATT M H，et al. Asymptotic and quadratic failure criteria for anisotropic materials[J]. International Journal of Plasticity，1989，5(4)：303–336. [24] TIEN Y M，KUO M C. A failure criterion for transversely isotropic rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(3)：399–412. [25] MORTARA G. A yield criterion for isotropic and cross-anisotropic cohesive-frictional materials[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2010，34(9)：953–977. [26] Mclellan P J，CORMIER K. Borehole instability in fissile，dipping shales，Northeastern British Columbia[C]// SPE Gas Technology Symposium. [S. l.]：[s. n.]，1996：535–547. [27] 蔚宝华，邓金根，汪海阁. 霍尔果斯背斜井壁稳定技术研究[J]. 石油勘探与开发，2007，34(1)：108–112.(YU Baohua，DENG Jingen，WANG Haige. Borehole stability technique for Huoerguosi anticline，Junggar Basin，North west China[J]. Petroleum Exploration and Development，2007，34(1)：108–112.(in Chinese)) [28] 徐芝纶. 弹性力学[M]. 北京：高等教育出版社，1998：35–87.(XU Zhilun. Elastic mechanics[M]. Beijing：Higher Education Press，1998：35–87.(in Chinese)) [29] 邓金根. 控制油井盐层段流变缩径的泥浆密度的计算方法[J]. 岩石力学与工程学报，1997，16(6)：522–528.(DENG Jingen. Calculation method of mud density to control borehole closure rate[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(6)：522–528. (in Chinese)) [30] HORNBY B E. The elastic properties of shales[PH. D. Thesis][D]. Cambridge：University of Cambridge，1994. [31] SAYERS C M. Seismic anisotropy of shales[J]. Geophysical Prospecting， 2005，53(5)：667–676. [32] SAROUT J，MOLEZ L，GUÉGUEN Y，et al. Shale dynamic properties and anisotropy under triaxial loading：experimental and theoretical investigations[J]. Physics and Chemistry of the Earth：Parts A/B/C，2007，32(8)：896–906.