Tight gas production model considering TPG as a function of pore pressure, permeability and water saturation

Petroleum Science

Wei-Ping Ouyang¹  Mian Zhang¹  Jin-Gang Fu²  Lei Li²  Asif Mehmood²  Yu-Liang Su²  Atif Zafar³ 

[1] Changqing Downhole Technology Company, Chuangqing Drilling Engineering Co., Ltd, CNPC, 710018, Xi’an, Shaanxi, China;School of Petroleum Engineering, China University of Petroleum (East China), 266580, Qingdao, Shandong, China;School of Petroleum Engineering, China University of Petroleum (East China), 266580, Qingdao, Shandong, China;Department of Petroleum Technology, University of Karachi, University Road, 75270, Karachi, Pakistan;

关键词: Inflow performance relationship;    Pore pressure;    Threshold pressure gradient;    Tight gas field development;    Tight gas sand reservoir;   

DOI  :  10.1007/s12182-020-00430-4

来源: Springer

【 摘 要 】

Threshold pressure gradient has great importance in efficient tight gas field development as well as for research and laboratory experiments. This experimental study is carried out to investigate the threshold pressure gradient in detail. Experiments are carried out with and without back pressure so that the effect of pore pressure on threshold pressure gradient may be observed. The trend of increasing or decreasing the threshold pressure gradient is totally opposite in the cases of considering and not considering the pore pressure. The results demonstrate that the pore pressure of tight gas reservoirs has great influence on threshold pressure gradient. The effects of other parameters like permeability and water saturation, in the presence of pore pressure, on threshold pressure gradient are also examined which show that the threshold pressure gradient increases with either a decrease in permeability or an increase in water saturation. Two new correlations of threshold pressure gradient on the basis of pore pressure and permeability, and pore pressure and water saturation, are also introduced. Based on these equations, new models for tight gas production are proposed. The gas slip correction factor is also considered during derivation of this proposed tight gas production models. Inflow performance relationship curves based on these proposed models show that production rates and absolute open flow potential are always be overestimated while ignoring the threshold pressure gradients.

【 授权许可】

CC BY