The Effects of Filter-Cake Buildup and Time-Dependent Properties on the Stability of Inclined Wellbores
- Minh Ha Tran (University of Oklahoma) | Younane Abousleiman (University of Oklahoma) | Vinh X. Nguyen (PVEP Phu Quy POC)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- December 2011
- Document Type
- Journal Paper
- 1,010 - 1,028
- 2011. Society of Petroleum Engineers
- 1.6 Drilling Operations, 1.11 Drilling Fluids and Materials, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties)
- Mud cake build up, Tiem-dependent wellbore failures
- 2 in the last 30 days
- 834 since 2007
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The effects of filter-cake buildup and/or filter-cake-property variation with time on wellbore stability have been plaguing the industry. The increasing use of lost-circulation materials (LCMs) in recent years for wellbore strengthening in weak and/or depleted formations nessesitates models that can predict these effects. However, the complexities of effective-stress and pore-pressure evolution around the borehole while drilling, coupled with the transient variation of mud-filtration properties, have delayed such modeling efforts. In this paper, the analytical solutions for the time-dependent effects of mudcake buildup and mudcake properties on the wellbore stresses and formation pore pressure, and thus the safe-drilling-mud-weight window, are derived. The transient effects of mudcake buildup and mudcake buildup coupled with its permeability reduction during filtration on the safe-drilling-mudweight window are illustrated through numerical examples. The results showed that the safe-mudweight windows were greatly affected by the buildup of filter cake and its permeability variation. For example, the analysis for filter-cake buildup with cake permeability of 10-2 md showed that the safe-mudweight window was widened by 0.5 g/cc after 2.5 hours post-excavation when compared to the case of a wellbore without mudcake. On the other hand, a lower mudcake permeability of 10-3 md widened the mudweight window by as much as 1 g/cc. Last but not least, the analyses revealed that even for mudcake permeability as low as 10-3 md, neglecting the permeable nature of the mudcake can result in overestimation of the safe-drilling-mudweight window.
|File Size||9 MB||Number of Pages||19|
Abousleiman, Y.N., Nguyen, V., Hemphill, T., and Kanj, M.Y.2007. Time-Dependent Wellbore Strengthening in Chemically Active or Less ActiveRock Formations. Paper AADE-07-NTCE-67 presented at the 2007 AADE NationalTechnical Conference and Exhibition, Houston, 10-12 April.
Alberty, M.W. and McLean, M.R. 2004. A Physical Model forStress Cages. Paper SPE 90493 presented at the SPE Annual Technical Conferenceand Exhibition, Houston, 26-29 September. doi: 10.2118/90493-MS.
Bezemer, C. and Havenaar, I. 1966. Filtration Behavior ofCirculating Drilling Fluids. SPE J. 6 (4): 292-298; Trans,AIME, 237. SPE-1263-PA. doi:10.2118/1263-PA.
Biot, M.A. 1941. General theory of three-dimensionalconsolidation. J. Appl. Phys. 12 (2): 155-164. doi: 10.1063/1.1712886.
Carter, J.P. and Booker, J.R. 1982. Elastic consolidationaround a deep circular tunnel. Int. J. Solids Struct. 18 (12):1059-1074. doi:10.1016/0020-7683(82)90093-2.
Cui, L., Abousleiman, Y., Cheng, A.H.D., and Roegiers, J.C. 1999.Time-Dependent Failure Analysis of Inclined Boreholes in Fluid-SaturatedFormations. J. Energy Resour. Technol. 121 (1): 31-39. doi: 10.1115/1.2795057.
Cui, L., Cheng, A.H-D., and Abousleiman, Y. 1997. PoroelasticSolution for an Inclined Borehole. J. Appl. Mech. 64 (1): 32-38.doi:10.1115/1.2787291.
Cui, L., Ekbote, S., Abousleiman, Y., Zaman, M.M. , and Roegiers, J.C.1998. Borehole stability analyses in fluid saturated formations withimpermeable walls. Int. J. Rock Mech. Min. Sci. 35 (4-5):582-583. doi:10.1016/s0148-9062(98)00077-1.
Dewan, J.T. and Chenevert, M.E. 2001. A model for filtration ofwater-base mud during drilling: Determination of mudcake parameters.Petrophysics 42 (3): 237-250.
Dupriest, F.E. 2005. Fracture Closure Stress (FCS) and LostReturns Practices. Paper SPE 92192 presented at the SPE/IADC DrillingConference, Amsterdam, 23-25 February. doi: 10.2118/92192-MS.
Geertsma, J. 1957. The Effect of Fluid Pressure Decline onVolumetric Changes of Porous Rocks. Trans., AIME, 210:331-340.
Hocking, G. 1976. Three-dimensional elastic stress distribution around theflat end of a cylindrical cavity. International Journal of Rock Mechanicsand Mining Sciences & Geomechanics Abstracts 13 (12): 331-337.doi:10.1016/0148-9062(76)91059-7.
Li, X. 1999. Stress and displacement fields around a deep circular tunnelwith partial sealing. Comput. Geotech. 24 (2): 125-140. doi:10.1016/s0266-352x(98)00035-4.
Li, X. and Flores-Berrones, R. 2002. Time-dependent behavior of partiallysealed circular tunnels. Comput. Geotech. 29 (6): 433-449. doi:10.1016/s0266-352x(02)00005-8.
Song, J.H and Rojas, J.C. 2006. Preventing Mud Losses byWellbore Strengthening. Paper SPE 101593 SPE Russian Oil and Gas TechnicalConference and Exhibition, Moscow, 3-6 October. doi: 10.2118/101593-MS.
Soroush, H. and Sambaio, J.H.B. 2006. Investigation intoStrengthening Methods for Stabilizing Wellbores in Fractured Formations. PaperSPE 101802 presented at the SPE Annual Technical Conference and Exhibition, SanAntonio, Texas, USA, 24-27 September. doi: 10.2118/101802-MS.
Stehfest, H. 1970. Algorithm 368: Numerical inversion ofLaplace transforms. Communications of the ACM 13 (1): 47-49. doi:10.1145/361953.361969.
Sweatman, R., Wang, H., and Xenakis, H. 2004. WellboreStabilization Increases Fracture Gradients and Controls Losses/Flows DuringDrilling. Paper SPE 88701 presented at the Abu Dhabi International PetroleumExhibition and Conference, Abu Dhabi, UAE, 10-13 October. doi: 10.2118/88701-MS.
Wu, J., Torres-Verdín, C., Sepehrnoori, K., and Proett, M.A.2005. The Influence of Water-Base Mud Properties and Petrophysical Parameterson Mudcake Growth, Filtrate Invasion, and Formation Pressure.Petrophysics 46 (1): 14-32.