Application of Slip Lag Time in Discrete to the Calculation of Gas upward Velocity in Deep Well

doi:10.11885/j.issn.1674-5086.2015.06.24.01

Abstract

Abstract: Considering the gas slipping velocity, the flow characteristics at the stopping and starting pumps are studied, and the method of slipping lag time in discrete is proposed for calculating the speed of gas slip in deep wells. The time sliding mesh algorithm is proposed in a multiphase flow, which is used to solve for the gas slipping velocity, and the data are calculated using a cubic spline function. Corresponding calculations are performed, and a control software is designed. We applied this mathematical model to a well in Yuanba Sichuan, and obtained results that met operational requirements. The gas remains in a supercritical state in the deep well, and the gas slippage is not serious and has little effect on the gas upward velocity. When the state of the gas changes from a supercritical state into a gas near the wellhead, substantial gas slippage occurs. If the gas slippage is not considered, the error rate is up to 76.36%. It was observed that with an increase in the pump stopping time and gas monitoring time, as well as a decrease in lag time, and that of the reservoir top boundary, upward velocities of the gas tend to decrease.

Key words: gas slipping, two-phase flow, gas slipping velocity, method of slip lag time, lag time

CLC Number:

TE357

HUANG Zhiqiang, OU Biao, KONG Xiangwei, WANG Xingyu, LIN Yuanhua. Application of Slip Lag Time in Discrete to the Calculation of Gas upward Velocity in Deep Well[J]. 西南石油大学学报(自然科学版), 2017, 39(2): 139-144.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2015.06.24.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2017/V39/I2/139

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