New method of predicting surge pressure apply to horizontal well based on casson flow*
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Abstract
In order to predict the surge pressure caused in the horizontal well drilling process, a new simple and applicable method has been established. It is based on the general theory of hydrostatic drilling fluid mechanics, and specifically described the flowing physical model towards surge pressure in horizontal well annulus, taking the effect of string eccentricity on the flowing law of drilling fluid into consideration. According to the constitutive equation of casson-mode under one-dimensional steady flow and the equations of annular flow rate under different drill string working conditions, this paper introduced the flow rate computation models of axial laminar flow in eccentric annulus apply to horizontal well, of which the numerical model was calculated by the program called Mathematica, ultimately, a new model for surge pressure prediction towards each interval in horizontal well was put forward. Application examples indicated that it can solve questions easily and precisely, which presents important meaning of guidance to the safety control while horizontal well drilling.
- Burkhardt, J.A. (1961) Wellbore pressure surges produced by pipe movement. Journal of Petroleum Technology, 13, 595-605.
- Rasmussen, O.S. and Sangesland, S. (2007) Evaluation of MPD methods for compensation of surge-and-swab pressures in floating drilling operations (IADC/SPE- 108346). IADC/SPE Managed Pressure Drilling & Underbalanced Operations, Galveston, Texas, U.S.A, 2007, 1-11.
- Wang, W. and Gong, J. (2006) Controlling surge due to accidental shutoff fast closing valve at terminal station of an oil pipeline (SPE-100914). International Oil & Gas Conference and Exhibition, Beijing, China, 2006, 1-7.
- Tao, Q., Xia, H., Peng, M. and Li, B. (2006) Research on surge pressure of casing running in high-temperature high-pressure oil well. Fault-Block Oil & Gas Field, 13, 58-60.
- Fan, H. and Liu, X. (1990) Analysis on surge pressure caused by mud viscosity in vertical well. Journal of the University of Petroleum, 14, 8-14.
- Fan, H., Chu, Y. and Liu, X. (1995) Predition for wellbore dynamic surge pressure while tripping a drillpipe. Journal of the University of Petroleum, 19, 37-41.
- Bizanti, M.S., Mitchell, R.F. and Leturno, R.E. (1991) Are improved surge models needed (SPE-22057). Unpublished.
- Wang, H. and Liu, X. (1994) Study on steady surge pressure of casson fluid in concentric annulus of directional wells. Drilling Fluid and Completion Fluid. 11, 35-44.
- Zhong, B., Shi, T., Fu, J. and Miao, S. (1999) Model for computing surge and swab pressures in slim end horizontal holes. Journal of Southwest Petroleum Institute, 21, 52-55.
- Wang, Z. and Tang, S. (1982) Casson rheological model in drilling fluid mechanics. International Petroleum Exhibition and Technical Symposium, Beijing, China, 1982, 397-435.
- Sun, W., Chen, J. and Li, Z. (1986) Comparison of rheological models in high shear rate range and experimental relationship between penetration rate and high shear viscosities. International Meeting on Petroleum Engineering, Beijing, China, 1986, 267-277.
- Manohar, L. (1983) Surge and swab modelling for dynamic pressures and safe trip velocities. IDAC/SPE Drilling Conference, New Orleans, Louisiana, 1983, 427-433.
- Wang, H., Su, Y. and Liu, X. (1998) Numerical analysis of steady surge pressure of power law fluid in eccentric annuli. Acta Petrolei Sinica, 19, 104-109.