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Mechanics model of critical annular velocity for cuttings transportation in deviated well
SONG Xun-cheng1,GUAN Zhi-chuan1,CHEN Shao-wei2
(1. College of Petroleum Engineering in China University of Petroleum,Dongying 257061,China ;2.Monitoning Department of Binnan Oil Production Plant, Shengli Oilfield, Binzhou 256606, China )
Abstract:
For the wellbore with high inclination, cuttings are transported to wellhead by a rolling form,while in the wellhore with a low angle, cuttings are suspended in drilling fluid and transported to the surface by a lifting form. On the basis of dynamics analysis on cuttings under two mechanisms, two corresponding models of critical velocity were developed. Based on the two models,a calculation method was constructed for determining the critical annular velocity to maintain hole cleaning. The trend of critical annular velocity varying with inclination predicted by critical annular velocity model was validated by comparison with old experimental results, and a good accordance was obtained. However, the predicted value of critical annular velocity is slightly lower than the experimental ones because of two different criteria on cuttings bed development. Its field application indicates also a good agreement between prediction and actual situations, which validated the reliability of this model.
Key words:  deviated well  cutting transportation  critical annular velocity  mechanics model