Abstract

The key factors which contribute to wellbore instability problems in oil and gas fields can be grouped as non-changeable and changeable. Non-changeable factors include the in-situ stress regime, pore pressures and the mechanical and strength properties of the formation and its bedding planes. Changeable factors include wellbore trajectory and mud weight (drilling fluid). In this paper, the effects of both changeable and non-changeable factors that influence wellbore stability are presented and discussed. Guidelines for efficient wellbore stability analysis have been developed. These guidelines can be used to improve the management of wellbore instability to achieve higher drilling efficiency and lower drilling costs.

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