Dual-porosity approach to wellbore stability in naturally fractured reservoirs

详细信息    Dual-porosity approach to wellbore stability in naturally fractured reservoirs

• 出版日期：2002.
• 页数：248 p. :
• 第一责任说明：Jincai Zhang.
• 分类号：a661.4
• ISBN：0493599517(ebk.) :

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02h0025736 20111011152551.0 cr un||||||||| 111011s2002 xx ||||f|||d||||||||eng | AAI3045843 0493599517(ebk.) : CNY371.35 NGL NGL NGL a661.4 Zhang, Jincai. Dual-porosity approach to wellbore stability in naturally fractured reservoirs [electronic resource] / Jincai Zhang. 2002. 248 p. : digital, PDF file. Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1543. ; Adviser: Jean-Claude Roegiers. Thesis (Ph.D.)--The University of Oklahoma, 2002. One of the most prominent features of rock formations is the presence of joints and fractures at all scales. Many petroleum reservoirs are situated in fractured porous formations. When boreholes are drilled in such formations, wellbore stability has been a major concern.;The naturally fractured reservoir was treated as a dual-porosity medium consisting of the primary rock matrix system and the fractured system. Assuming the matrix and fractures in the fractured medium to be ‘separate and overlapping’, and applying the double effective law, the dual-porosity formulations that couple matrix and fracture deformations and fluid flow in the matrix and fracture systems for the fractured porous formations were presented.;The numerical method was applied to solve the dual-porosity formulations. The finite element solution and a windows-based pseudo-three-dimensional finite element software for any directional wellbore drilled in dual-porosity media were given, in which the mud weight considerations were presented for the permeable and impermeable boundary conditions. The failure criteria, including compressive failure, tensile failures, shear failures were introduced into the numerical model and failure stresses and failure areas around boreholes were examined. Furthermore, the elastoplastic finite element method and computational procedure were presented in the dissertation.;Several application examples including inclined and horizontal wellbore in different in-situ stress regions, the best trajectory selections for horizontal borehole, rock cutting mechanism, and stress-dependent permeability around wellbores were investigated. Boring. ; Gas well drilling. ; Oil well drilling. Electronic books. aeBook. aCN bNGL http://proquest.calis.edu.cn/umi/detail_usmark.jsp?searchword=pub_number%3DAAI3045843&singlesearch=no&channelid=%CF%B8%C0%C0&record=1 NGL Bs1033 rCNY371.35 ; h1 bs1108