Technical Paper: Determination of Rock Strength Using Advanced Sonic Log Interpretation Techniques

Society: SPE
Paper Number: 124161
Presentation Date: 2009
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Analysis and prediction of geomechanical problems are important for the success of drilling, completion, and production operations and require knowledge of rock strength, pore pressure, and in situ stress. Geomechanical problems encountered during drilling include wellbore stability and fracturing of the formation and may lead to financial loss due to drilling fluid loss, well control events, stuck pipe, extra casing strings, and sidetracks. Examples of geomechanical problems due to reservoir stress changes occurring during production include reservoir compaction, surface subsidence, casing deformation and failure, sanding, etc.

The information needed to assess the impact of geomechanical problems on field development can be captured by building a mechanical earth model (MEM) that includes details of the in situ stresses, rock failure mechanisms, rock mechanical parameters, geologic structure, stratigraphy and well geometry. The paper illustrates the workflow for building a model along a deviated well’s trajectory based on logs and drilling data; the well was drilled through deepwater Gulf of Mexico channel sands.

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