Abstract
In the past two decades, aerated drilling has been applied to improving recovery of the low permeability oil and gas reservoirs at home and abroad. This technology can improve the level of exploration and development, reduce the cost of drilling and protect reservoir. Because of its advantages, aerated drilling has been developed and promoted rapidly. And its theoretical study has also been further developed. In this paper, the impact of the eccentric drill string to annular multiphase fluid in aerated drilling was studied. Based on mathematical solution of eccentric annuli, combined with multiphase flow control equations and flow law, aerated drilling eccentric annulus pressure formula was derived. Under the condition of Concentricity and different degrees of eccentricity, the eccentric annulus pressure were calculated. The distribution law of annulus pressure with depth and the influence law of the eccentricity to annulus pressure were analyzed. Key words: Aerated drilling, Eccentric annuli; Annulus pressure
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