Analyses of Wellbore Instability in Drilling Through Chemically Active Fractured-Rock Formations
- Vinh X. Nguyen (PoroMechanics Institute) | Younane N. Abousleiman (University of Oklahoma) | Son Hoang (University of Oklahoma)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- June 2009
- Document Type
- Journal Paper
- 283 - 301
- 2009. Society of Petroleum Engineers
- 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 1.1 Well Planning, 1.1.6 Hole Openers & Under-reamers, 5.2 Reservoir Fluid Dynamics, 1.2.1 Wellbore integrity, 4.3.4 Scale, 1.2.2 Geomechanics, 5.8.6 Naturally Fractured Reservoir, 1.11 Drilling Fluids and Materials, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 4.1.2 Separation and Treating, 1.5 Drill Bits, 5.1.10 Reservoir Geomechanics, 4.1.5 Processing Equipment, 5.3.1 Flow in Porous Media, 1.6 Drilling Operations
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Numerous time-dependent wellbore-instability problems have been reported while drilling through the chemically active fractured-shale formations in the Arabian Gulf. Very often, these shales are characterized by the abundance of not only macroscale bedding planes but also networks of microscale natural fractures. The presence of fractures weakens the shale mechanically and produces higher-permeability fluid-flow paths within the low-permeability rock formation. Because of different fluid-diffusion rates between the fractures and shale matrix, there are two distinct pore-pressure fields in saturated fractured shale. Additionally, in chemically active shale formations, osmotic pressure arises because of the imbalance in mud/shale chemical activity. Practically, it is extremely complex to isolate the fractures from the matrix for analysis or to identify fracture size and fracture density. However, a first-order approach in an attempt to understand the porous fractured-shale behavior is to use dual-porosity and dual-permeability theory of poromechanics in the analytical modeling. In this study, a poromechanical inclined-wellbore solution has been derived that incorporates time dependency, a primary porosity and permeability for the matrix, a secondary porosity and permeability for the fractures, and the chemical effect. The expressions for the stresses and pressure solutions are presented and detailed in Appendix A. These analytical solutions are used to simulate an inclined-wellbore-stability problem in a fractured-shale formation, accounting also for bedding planes in some instances in addition to the microfractures. Additionally, retrieved rock samples of fractured shale were tested by use of an innovative laboratory characterization device, the Inclined Direct Shear Testing Device (IDSTD) (PoroMechanics Institute; Norman, Oklahoma; 2008). This device tests tiny shale specimens (rock volume less than 0.14 in.3) and is capable of measuring cohesion and friction angle while the sample is subjected to in-situ stresses, varying mud pressures, and mud-circulation times.
|File Size||7 MB||Number of Pages||19|
Abousleiman, Y. and Ekbote, S. 2005. Solutions for the Inclined Boreholein a Porothermoelastic Transversely Isotropic Medium. J. Appl. Mech.72 (1): 102-114. doi:10.1115/1.1825433.
Abousleiman, Y. and Nguyen, V. 2005. PoroMechanicsResponse of Inclined Wellbore Geometry in Fractured Porous Media. J.Eng. Mech. 131 (11): 1170-1183.doi:10.1061/(ASCE)0733-9399(2005)131:11(1170).
Abousleiman, Y., Kanj, M, and Ekbote, S. 2001. Poromechanical Tools for ReservoirRock Testing Simulation and Wellbore Stability. Paper SPE 71459 presentedat the SPE Annual Technical Conference and Exhibition, New Orleans, 30September-3 October. doi: 10.2118/71459-MS.
Abousleiman, Y., Tran, M., and Hoang, S. 2008. Laboratory Characterizationof Anisotropy and Fluid Effects on Shale Mechanical Properties Using InclinedDirect Shear Testing Device, IDSTD™. Proc., 42nd U.S. Rock MechanicsSymposium, San Francisco, 29 June-2 July.
Aifantis, E.C. 1979. On the Response of Fissured Rocks. In Developmentsin Mechanics, Volume 10, 249-252.
Al-Tahini, A.M., Abousleiman, Y.N., and Brumley, J.L. 2005. Acoustic and Quasistatic LaboratoryMeasurement and Calibration of the Pore Pressure Prediction Coefficient in thePoroelastic Theory. Paper SPE 95825 presented at the SPE Annual TechnicalConference and Exhibition, Dallas, 9-12 October. doi: 10.2118/95825-MS.
Bear, J. 1972. Dynamics of Fluids in Porous Media. Oxford, UK:Environmental Science Series, Elsevier.
Berryman, J.G. 2002. Extension ofPoroelastic Analysis to Double-Porosity Materials: New Technique inMicrogeomechanics. J. Eng. Mech. 128 (8): 840-847.doi:10.1061/(ASCE)0733-9399(2002)128:8(840).
Billaux, D., Chiles, J.P., Hestir, K., and Long, J. 1989. Three-DimensionalStatistical Modeling of a Fractured Rock Mass--An Example from theFanay-Augeres Mine. Int. J. Rock Mech. Min. Sci. & Geomech.Abstr. 26 (3-4): 281-299.doi:10.1016/0148-9062(89)91977-3.
Biot, M.A. 1941. GeneralTheory of Three-Dimensional Consolidation. J. Appl. Phys.12 (2): 155-164. doi: 10.1063/1.1712886.
Bowen, R.M. 1982. Compressible Porous MediaModels by the Theory of Mixtures. Int. J. Eng. Sci. 20(6): 697-735. doi:10.1016/0020-7225(82)90082-9.
Cui, L., Cheng, A.H-D., and Abousleiman, Y. 1997. Poroelastic Solution for an InclinedBorehole. J. Appl. Mech. 64 (1): 32-38.doi:10.1115/1.2787291.
Ekbote, S. and Abousleiman, Y. 2005. PorochemothermoelasticSolution for an Inclined Borehole in a Transversely Isotropic Formation.J. Eng. Mech. 131 (5): 522-533.doi:10.1061/(ASCE)0733-9399(2005)131:5(522).
Ekbote, S. and Abousleiman, Y. 2006. PorochemoelasticSolution for an Inclined Borehole in a Transversely Isotropic Formation.J. Eng. Mech. 132 (7): 754-763.doi:10.1061/(ASCE)0733-9399(2006)132:7(754).
Geertsma, J. 1957. TheEffect of Fluid Pressure Decline on Volumetric Changes of Porous Rocks.Trans., AIME, 210: 331-340.
Katsube, N. and Carroll, M.M. 1987. The Modified Mixture Theory forFluid-Filled Porous Materials: Applications. J. Appl. Mech.54: 41-46.
Nair, R., Abousleiman, Y., and Zaman, M.M. 2005. Modeling FullyCoupled Oil-Gas Flow in a Dual-Porosity Medium. Int. J. Geomech.5 (4): 326-338. doi:10.1061/(ASCE)1532-3641(2005)5:4(326).
Nguyen, V., and Abousleiman, Y. 2005. PoroElastic Parameters for ChemicallyActive Porous Media. In Poro-Mechanics III: Biot Centennial (1905-2005),ed. Y.N. Abousleiman, A.H-D. Cheng, and F-J. Ulm, 695-703. London: A.A.Balkema.
Onaisi, A., Locane, J., and Razimbaud, A. 2000. Stress Related WellboreInstability Problems in Deep Wells in ABK Field. Proc., 9th Abu DhabiInternational Petroleum Exhibition and Conference, Abu Dhabi, UAE, 15-18October, 1-8.
Pariseau, W.G. 1993. Equivalent Properties ofa Jointed Biot Material. Int. J. Rock Mech. Min. Sci. & Geomech.Abstr. 30 (7): 1151-1157.doi:10.1016/0148-9062(93)90085-R.
Stehfest, H. 1970. Algorithm 368: NumericalInversion of Laplace Transforms [D5]. Communications of the ACM13 (1): 47-49. doi:10.1145/361953.361969.
Timoshenko, S. and Goodier, J.N. 1951. Theory of Elasticity, secondedition. New York City: McGraw-Hill.
Warren, J.E. and Root, P.J. 1963. The Behavior of Naturally FracturedReservoirs. SPE J. 3 (3): 245-255; Trans., AIME,228. SPE-426-PA. doi: 10.2118/426-PA.
Wilson, R.K. and Aifantis, E.C. 1982. On the Theory ofConsolidation With Double Porosity. Int. J. Eng. Sci.20 (9): 1009-1035. doi:10.1016/0020-7225(82)90036-2.
Yamamoto, K., Shioya, Y., Matsunaga, T., Kikuchi, S., and Tantawi, I. 2002.A Mechanical Model of ShaleInstability Problems Offshore Abu Dhabi. Paper SPE 78494 presented at theAbu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE,13-16 October. doi: 10.2118/78494-MS.
Yamamoto, K., Waragai, T., Kikuchi, S., Fada'q, A.S., Koyama, T., andMatsunaga, T. 2004. HistoricalReview and Rock Mechanics Approach to Improve the Wellbore Stability in NahrUmr Shale Formation. Paper SPE 88782 presented at the Abu DhabiInternational Petroleum Exhibition and Conference, Abu Dhabi, UAE, 10-13October. doi: 10.2118/88782-MS.