NEW MODEL IMPROVES GAS MIGRATION VELOCITY ESTIMATES IN SHUT-IN WELLS

Ashley Johnson Schlumberger Cambridge Research Ltd. Cambridge, England Jeffrey Tarvin Schlumberger-Doll Research Ridgefield, Conn. A new model includes the affects of mud compressibility, well bore elasticity, and fluid loss for accurate calculation of the pressure increases in a shut-in well bore following a kick. Incorrect estimates of gas migration can lead to additional problems during well control (Fig. 1). Direct measurements of gas migration velocities in laboratory experiments and

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