Discrete element modeling applied to laboratory simulation of near-wellbore mechanics

被引:43
作者
Cook, B.K. [1 ]
Lee, M.Y. [1 ]
DiGiovanni, A.A. [2 ]
Bronowski, D.R. [1 ]
Perkins, E.D. [3 ]
Williams, J.R. [4 ]
机构
[1] Sandia National Laboratories, Albuquerque
[2] Technology Assessment and Transfer, Annapolis, MD 21401
[3] IBM Watson Research Center, Cambridge, MA 02142
[4] Massachusetts Inst. of Technology, Cambridge, MA 02139
关键词
Bonding; Boreholes; Damage; Discrete elements; Fractures; Hydraulic models; Simulation;
D O I
10.1061/(ASCE)1532-3641(2004)4:1(19)
中图分类号
学科分类号
摘要
Simulation results of near-wellbore failure phenomena are presented from a joint experimental-numerical study directed at developing a robust numerical simulation capability for the exploration and prediction of near-wellbore mechanics. An experimental procedure was developed for the laboratory simulation of slurry injection. A true-triaxial vessel, which applied realistic, three-dimensional stress conditions, was used to perform slurry injection into Berea sandstone. Under anisotropic horizontal stress conditions, vertical hydraulic fractures initiated and propagated in the direction of the maximum horizontal stress. Under isotropic horizontal stress conditions, multiple vertical fractures were induced and propagated in random orientation. A computationally efficient numerical model based on the discrete element method (DEM) is described and applied to simulate various wellbore phenomena. Radially graded, two-dimensional DEM models of the near-wellbore region were created of bonded disk elements. Source DEM elements were used to simulate fluid pressurization of the model borehole. The structural damage in the DEM models was analyzed using histograms of the angular distribution of bond damage. Results obtained for various stress states showed qualitative reproduction of the gross failure mechanisms associated with both hydraulic fracturing and borehole breakout. © ASCE.
引用
收藏
页码:19 / 27
页数:8
相关论文
共 33 条
[11]  
Haimson B., Song I., Borehole breakouts in Berea sandstone: Two porosity-dependent distinct shapes and mechanisms of formation, SPE 47249, SPE/ISRM Eurock '98, (1998)
[12]  
Hainey B.W., Keck R.G., Smith M.B., Lynch K.W., Barth J.W., On-site fracturing disposal of oilfield waste solids in Wilmington field, Long Beach unit, CA, SPE 38255, Proc., SPE Western Regional Meeting, pp. 77-84
[13]  
Hazard J., Young R.P., Maxwell S., Micromechanical modeling of cracking and failure in brittle rocks, J. Geophys. Res. [Space Phys.], 105, pp. 16683-16697, (2000)
[14]  
Jaeger J., Cook N., Fundamentals of Rock Mechanics, (1969)
[15]  
Jensen R., Edil T., Bosscher P., Plesha M., Ben Kahla N., Effect of particle shape on interface behavior of DEM-simulated granular materials, Int. J. Geomech., 1, 1, pp. 1-19, (2001)
[16]  
Jensen R., Preece D., Cook B., Perkins E., Williams J., Coupled fluid-flow/particle-motion computer modeling of sand production in oil wells, SPE No. 56630, Society of Petroleum Engineers Annual Conference, (1999)
[17]  
Louviere R.J., Reddoch J.A., Onsite disposal of riggenerated waste via slurrification and annular injection, SPE 25755, Proc., SPE/IADC Drilling Conf., pp. 737-751, (1993)
[18]  
Malachosky E., Shannon B.E., Jackson J.E., Aubert W.G., Offshore disposal of oil-based drilling-fluid waste: An environmentally acceptable solution, SPE Drill. Completion, 8, pp. 287-293, (1993)
[19]  
Masson S., Martinez J., Effect of particle mechanical properties on silo flow and stresses from distinct element simulations, Powder Technol., 109, pp. 164-178, (2000)
[20]  
Morgan J., Boettcher M., Numerical simulations of granular shear zones using the distinct element method, J. Geophys. Res. [Space. Phys.], 104, pp. 2703-2719, (1999)