An approach for wellbore failure analysis using rock cavings and image processing

Skea, Christopher; Rezagholilou, Alireza; far, Pouria Behnoud; Gholami, Raoof; Sarmadivleh, Mohammad

doi:10.1016/j.jrmge.2018.04.011

Cited by 21 publications

(4 citation statements)

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“…15); such splintery cavings are produced Fig. 11 Induced pore pressure at a circular borehole wall based on the anisotropic approach (the Amadei solution + anisotropic poroelasticity) for the stiffer grain case in zones where tensile failures occur throughout the wellbore circumference (Skea et al 2018). The difference between the two approaches is largely due to the induced pore pressure, which is associated with anisotropy in Skempton's parameters and in-situ stress state.…”

Section: Discussionmentioning

confidence: 99%

“…2. Similarly, the anisotropic approach gives negative principal effective stress at sides of borehole for wellbore orientations f and g. The negative principal effective stress is caused by the negative radial effective stress, which may trigger the radial tensile failure (tensile failures throughout the wellbore circumference) (Fjaer et al 2008;Skea et al 2018). Fig.…”

Section: )mentioning

confidence: 98%

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Anisotropic Wellbore Stability Analysis: Impact on Failure Prediction

Asaka

Holt

2020

Rock Mech Rock Eng

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Shale formations are the main source of borehole stability problems during drilling operations. Suboptimal predictions of borehole failure may partly be caused by neglecting the anisotropic nature of shales: Conventional wellbore stability analysis is based on borehole stresses computed from isotropic linear elasticity (Kirsch solution) with the assumption of no induced pore pressure. This is very convenient for a practical implementation but does not always work for shales. Here, anisotropic wellbore stability analysis was performed targeting an offshore gas field to investigate in particular the impact of elastic anisotropy on borehole failure predictions. Stress concentration around a circular borehole in anisotropic shale was calculated by the Amadei solutions, and induced pore pressure was obtained from the Skempton parameters based on anisotropic poroelasticity. Borehole failure regions and modes were then predicted using the effective stresses and those are apparently consistent with observations. A comparison with the conventional approach suggests the importance of accounting for elastic anisotropy: Predicted failure regions, modes, and also the associated mud weight limits can be completely different. This observation may have significant implications for other fields since shale often show strong elastic anisotropy.

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Section: Discussionmentioning

confidence: 99%

Section: )mentioning

confidence: 98%

Anisotropic Wellbore Stability Analysis: Impact on Failure Prediction

Asaka

Holt

2020

Rock Mech Rock Eng

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“…It is thus necessary to consider their influence when conducting a rigorous wellbore stability analysis, particularly when drilling in a depleted reservoir. Maintaining stability of a wellbore and strengthening the wellbore wall have been widely studied in the literature (Gao et al, 2022;Gholilou et al, 2017;Liu et al, 2023;Marbun et al, 2011;Singh et al, 2019;Skea et al, 2018;Zhang et al, 2021). Among these, wellbore instability in shales is important as the shales are clay-rich formations forming the most abundant sedimentary rocks (around 70%).…”

Section: Introductionmentioning

confidence: 99%

“…It is suggested that considering a poroelastic model rather than pure elastic may vary mud windows' minimum and maximum limits by about 12.5% and 25%, respectively (Darvishpour et al, 2019;Kianoush et al, 2023b;Rafieepour et al, 2020;Shad et al, 2022;Shahbazi et al, 2020). Although linear elasticity modeling has been used for different studies, it does not consider porous media effects (Alberty and McLean, 2001;Michael and Gupta, 2022;Skea et al, 2018). The poroelastic concept recognizes pore pressure and its diffusion effects to evolve more realistic understandings regarding various stresses or failure conditions.…”

Section: Introductionmentioning

confidence: 99%

Wellbore Stability in a Depleted Reservoir by Finite Element Analysis of Coupled thermo-poro-elastic Units in an Oilfield, SW Iran

Pirhadi,

Kianoush,

Ebrahimabadi

et al. 2023

Preprint

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Maintaining wellbore stability in depleted reservoirs is a critical problem. With production from hydrocarbon reservoirs, the pore pressure of the reservoir is reduced over time, and the reservoir is depleted since field development is one of the main purposes for oil companies. Heavy mud weight in depleted reservoir caused fracture due to reduced fracture gradient, and low mud weight caused blow out in high-pressure zone or well collapse due to shale beds that required high mud weight to prevent collapse. Considering geomechanics and coupled equilibrium equation, continuity equation, Hook’s law, compatibility equation, Darcy’s law, and thermal relation, the Thermo-poro-elastic equation was derived in this research. A finite element method has been developed to implement the fully coupled thermo-poro-elastic non-linear models. The finite element model was validated by comparing it to the available analytical solutions for the thermo-poro-elastic wellbore problems in shale. The non-linear thermal-poro-elasticity finite element model was used to analyze wellbore stability in a depleted limestone reservoir during drilling. The numerical results showed that a decrease drilling fluid’s temperature (cooling) causes to increase in the potential for tensile failure and reduces the potential of shear failure. Due to the depletion reservoir, the potential of tensile failure increased than shear failure, so heating the drilling fluid could cause wellbore stability in the depleted reservoir. Furthermore, based on the numerical results, it may be concluded that the drilling fluid’s temperature is one of the important factors in the wellbore stability analysis in depleted reservoirs.

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A Method Based on Optimizing the Control Parameters in Image Processing and Vision Algorithm

Zhang

2022

Lecture Notes in Electrical Engineering

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An approach for wellbore failure analysis using rock cavings and image processing

Cited by 21 publications

References 4 publications

Anisotropic Wellbore Stability Analysis: Impact on Failure Prediction

Anisotropic Wellbore Stability Analysis: Impact on Failure Prediction

Wellbore Stability in a Depleted Reservoir by Finite Element Analysis of Coupled thermo-poro-elastic Units in an Oilfield, SW Iran

A Method Based on Optimizing the Control Parameters in Image Processing and Vision Algorithm

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