Borehole Failure: Safe Drawdown Pressures and Wellbore Damage Radius

Morales, R.H.; Webb, Tammy; Hollier, R.

doi:10.2118/58789-ms

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Furthermore, by the adoption of optimum deviation angle and drilling direction, it is shown that the mechanical stability of inclined wells can be increased. The work in Morales et al presents numerical examples and laboratory tests to show the onset of failure and the growth of the plastic zone development and propagation during production. In Wanga and Dusseault, a method is proposed for the calculation of linear thermo‐poroelastic tangential stresses around a borehole, in a medium with isotropic permeability for the case of constant borehole temperature and variable pore pressure.…”

Section: Introductionmentioning

confidence: 99%

An adaptive finite element model for wellbore breakout simulation

Cecílio

Devloo

Gomes

et al. 2019

Num Anal Meth Geomechanics

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Summary A finite element formulation is proposed and implemented for analysing the stability of excavated wells using the DiMaggio‐Sandler constitutive elastoplastic model with a typical carbonate reservoir configuration. The quality of the finite element approximation is ensured by applying smooth curved elements adapted to the wellbore geometry, and h − p adaptive finite element meshes in the plastic zone. General purpose procedures are defined to transfer the elastoplastic deformation history to newly created integration points. A breakout damage criterion is proposed based on the second invariant of the deviatoric plastic deformation tensor. This damage criterion is used to apply a mesh movement algorithm to represent material collapse. The automatic successive application of the breakout damage criterion results in elliptical realistically looking geometries obtained in experiments reported in the literature.

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Section: Introductionmentioning

confidence: 99%

An adaptive finite element model for wellbore breakout simulation

Cecílio

Devloo

Gomes

et al. 2019

Num Anal Meth Geomechanics

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“…Bottomhole pressure also controls the effective stress born by the formation that will have an impact on formation collapse and sand production. Studies have shown that for wells with no sand-exclusion device preventing sand ingress, a critical pressure exists, below which sand failure and sand production are expected to occur (Morita et al 1989;Zhang et al 1998;Morales et al 2000). Permeability can decline because of compaction; therefore, bottomhole pressure may also have a large impact on the formation permeability near the wellbore.…”

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confidence: 99%

Well Performance With Operating Limits Under Reservoir and Completion Uncertainties

Wehunt

2006

SPE Drilling &Amp; Completion

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This paper shows how to evaluate well performance under conditions of reservoir and completion uncertainty while also considering the impact of completion decisions and operating constraints. This topic is important because it can help to reconcile the often large gap between short-term deliverability and reliable and sustainable performance. Table 1 presents a list of operating constraints, and this paper includes examples regarding the application of some of the constraints. This table also includes consideration for the type of surveillance that is needed to apply the constraints. Discussion within the paper shows that the most relevant types of operating constraints are often not being used and also addresses appropriate operating limits for completions with sand control.Completion selection and design influence operating constraints. Examples within the paper illustrate methods to determine appropriate operating constraints. The examples also demonstrate the potential advantage of frac-packed completions or long horizontal completions with regard to preventing fines movement and increasing the longevity of both the completion equipment and the productivity.To aid with probabilistic performance forecasting, the paper includes a tabulation of published skin values including some permeability data.

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The Effect of Inner Borehole and Outer Boundary Dimensions in Thick-Walled Cylinder Test

Tehrani

Sinaki

Sarmadivaleh

et al. 2016

SPE Eastern Regional Meeting

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It is well-known that the risk of sanding varies for different completion systems, i.e. open hole versus cased and perforation, in a given wellbore and reservoir. Part of this difference comes from the scale effect of the borehole. Pragmatic approaches are usually taken to consider the borehole scale effect in the sand production prediction analysis. A more rigorous approach is needed to take this effect into account. Experiments have been conducted by researchers on Thick-Walled Cylinder (TWC) samples with different inner to outer diameter ratios (ID/OD) for samples with standard dimensions (1.5in ID, and 3in length) to investigate the borehole scale effect on the failure of the inner borehole. However, the results partially suffer from the outer boundary effect of the tests and may not purely represent the inner borehole scale effect. Here in this paper, the outer boundary effects of TWC experiments were distinguished from the inner borehole scale effect using analytical approaches followed by extensive laboratory experiments. For this purpose results from comparing different failure criteria (i.e. Mohr-Coulomb, Drucker-Prager, Mogi and modified Lade) from Tehrani's results (2016) were used. Then, the volumetric strain was formulated against confining pressure to explain the elastic, elastic-plastic, and plastic behaviour of the rock. Variation of TWC strength of samples with different inner borehole sizes may not be fully captured by the analytical approach which only considers the effect of the ID/OD. Hence, the differences between the analytical and experimental approaches can be considered as the inner borehole scale effect. As expected, the analysis showed that the size of the inner borehole and the outer boundaries significantly change the TWC strength of the rock. After distinguishing the outer boundary effects, the results shows a decreasing trend between the inner borehole size and the TWC strength of the sample, which can be considered as the borehole scale effect. This study has also broadened the understanding of the effect of borehole and boundaries dimensions in TWC test, which may be generalized to real scale cases, i.e. wellbores and perforations.

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Borehole Failure: Safe Drawdown Pressures and Wellbore Damage Radius

Cited by 4 publications

References 11 publications

An adaptive finite element model for wellbore breakout simulation

An adaptive finite element model for wellbore breakout simulation

Well Performance With Operating Limits Under Reservoir and Completion Uncertainties

The Effect of Inner Borehole and Outer Boundary Dimensions in Thick-Walled Cylinder Test

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