Introduction to special issue on Borehole Stability

Aadnøy, Bernt S.; Ong, Seehong

doi:10.1016/s0920-4105(03)00022-6

Cited by 64 publications

(12 citation statements)

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“…The number of breakouts, and thus mechanical instability of the borehole, can be reduced by raising the mud weight and/or altering borehole deviation and azimuth in order to lower the circumferential stress acting on the wellbore (Aadnoy and Chenevery, 1987;Moos and Peska, 1998;Aadnoy, 2003). It is .…”

Section: Implications For Hydrocarbon and Geothermal Productionmentioning

confidence: 99%

Present-day stress orientation in the Molasse Basin

et al. 2010

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Section: Implications For Hydrocarbon and Geothermal Productionmentioning

confidence: 99%

Present-day stress orientation in the Molasse Basin

et al. 2010

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“…Another illustrative case history is that of the Matagorda Island 623 field in the Gulf of Mexico, where all 17 wells have experienced some form of well failure [23]. Overall, it is estimated that the cost associated with wellbore instability is at least one billion dollars per year worldwide [1].…”

Section: Introductionmentioning

confidence: 99%

A locally conservative finite element framework for the simulation of coupled flow and reservoir geomechanics

2007

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In this paper, we present a computational framework for the simulation of coupled flow and reservoir geomechanics. The physical model is restricted to Biot's theory of single-phase flow and linear poroelasticity, but is sufficiently general to be extended to multiphase flow problems and inelastic behavior. The distinctive technical aspects of our approach are: (1) the space discretization of the equations. The unknown variables are the pressure, the fluid velocity, and the rock displacements. We recognize that these variables are of very different nature, and need to be discretized differently. We propose a mixed finite element space discretization, which is stable, convergent, locally mass conservative, and employs a single computational grid. To ensure stability and robustness, we perform an implicit time integration of the fluid flow equations. (2) The strategies for the solution of the coupled system. We compare different solution strategies, including the fully coupled approach, the usual (conditionally stable) iteratively coupled approach, and a less common unconditionally stable sequential scheme. We show that the latter scheme corresponds to a modified block Jacobi method, which also enjoys improved convergence properties. This computational model has been implemented in an objectoriented reservoir simulator, whose modular design allows for further extensions and enhancements. We show several representative numerical simulations that illustrate the effectiveness of the approach.

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“…Several studies were conducted in order to understand these contradictory data and propose adequate mechanisms and solutions for drilling. Aadnoy (2003) intended to visualize that a good field modeling, based on the understanding of the underlying physics is the key for development of wellbore technologies and practices.…”

Section: Shale Instabilitymentioning

confidence: 99%