期刊
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
卷 145, 期 -, 页码 346-356出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.petrol.2016.05.038
关键词
Herschel Buckley fluid; Surge pressure; Eccentric annuli; Modeling; CFD, Tripping speed
资金
- University of Oklahoma
- National Natural Science Foundation of China [51474186, 51574202]
- project of the 12th Five-Year Plan of China [2011ZX05045-03-01WX]
- project of the 11th Five-Year Plan of China [2008ZX050450307HZ]
Axial movement of drillstring during drilling operations causes downhole pressure variations, which are commonly known as surge and swab pressures. This paper presents a new eccentric annulus surge pressure (EASP) model for yield power law (YPL) fluid. To develop the model, flow in eccentric annulus was investigated using computational fluid dynamics (CFD) technique (ANSYS Fluent). CFD simulations were conducted varying fluid rheological parameters, tripping speed and annular geometry. Simulation results are analyzed considering surge pressure ratio (i.e. ratio of surge pressure in eccentric annulus to that of concentric annulus) as a parameter for quantifying effect of eccentricity on surge pressure. Surge pressure ratio (SPR) is found to be very sensitive to fluid behavior index and annular eccentricity and diameter ratio. In addition to the CFD studies, small-scale laboratory experiments were conducted to validate accuracy of the EASP model. Results show that the model accurately (i.e. maximum error of +/- 5%) and conveniently predicts surge and swab pressures for YPL (Herschel Buckley) fluid in eccentric annulus without requiring complex numerical procedures. The model is valid for wide ranges of diameter ratio (0.2 <= K-d <= 0.8), eccentricity (0 <= epsilon <= 0.9) and fluid behavior index (0.2 <= n <= 1). (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据