Abstract

ABSTRACT This paper presents a new method to predict both gas velocity and gas concentration for processes of well control operations in vertical or near vertical wells. The effect of gas concentration on gas velocity is taken into account. The dispersion of the gas-contaminated region of drilling fluid with time can be determined for both static and circulating well conditions. The method was integrated into an existing well control simulator computer program. The improved numerical model closely predicted measured casing pressure profiles that were obtained in a 6000-ft research well.

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