Openhole Stability and Sanding Predictions by 3D Extrapolation from Hole-Collapse Tests

Author:

Ewy R. T.1,Ray P.1,Bovberg C. A.2,Norman P. D.1,Goodman H. E.1

Affiliation:

1. Chevron Petroleum Technology Co.

2. Chevron Research and Technology Co.

Abstract

Summary Wellbore failure is best simulated in the laboratory by subjecting a model hole to simulated in-situ stresses. A jacketed, thick-walled, hollow cylinder is subjected to increasing pressure on the outer surface until hole collapse occurs. This provides a direct measure of the stress required to cause hole failure in that particular formation interval. To extrapolate to the downhole situation, a 3D analytic model is presented that is applicable to both stability and sanding of open wellbores. This model uses a Modified Lade failure criterion that properly accounts for the effect of the intermediate principal stress on rock failure. The Modified Lade rock-strength parameters are extracted from the measured hole-collapse strength (HCS) and are then combined with the in-situ stresses and formation pore pressure to determine the required mud weight for stability while drilling and the allowable drawdown pressure for prevention of sand production.

Publisher

Society of Petroleum Engineers (SPE)

Subject

Mechanical Engineering,Energy Engineering and Power Technology

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