Determination of reasonable bottom-hole pressure in unconventional tight oil reservoirs; a field case investigation

• Published in: Lithosphere Vol. 2022; no. Special 12
• Main Authors: Zhou Xiaofeng, Zhou Xiaofeng, Wei Jianguang, Wei Jianguang, Zhang Ao, Zhang Ao, Zhang Xin, Zhang Xin, Rong Gen, Rong Gen, Chen Yongda, Chen Yongda
• Format: Journal Article
• Language: English
• Published: GeoScienceWorld 2022
• Subjects: bottom-hole flow pressure; case studies; computer programs; data processing; ECLIPSE computer program; Economic geology; energy sources; enhanced recovery; field studies; fluid phase; numerical models; optimization; permeability; petroleum engineering; porosity; pressure; reservoir properties; simulation; stress; three-dimensional models; unconventional reservoirs; viscosity
• ISSN: 1941-8264; 1947-4253
• DOI: 10.2113/2022/2007568

The bottom-hole flow pressure is an important factor affecting the production of the unconventional tight oil well. The reasonable bottom-hole flow pressure has a positive effect on enhancing the production capacity of oilfields and improving the production efficiency of oilfield enterprises. Therefore, a robust method is proposed to determine the reasonable bottom-hole flow pressure in unconventional tight oil reservoirs, sharing the advantages of coupling geological feature and fluid flow behavior. In this method, the geological model and numerical reservoir simulation based on ECLIPSE software are developed firstly. The effects of the stress sensitivity, the PVT properties, permeability damage, fracturing fluid leak-off, and skin coefficient on the single-well productivity are then discussed. The reasonable variation range of the bottom-hole flow pressure in different production stages is then determined. Results show that crude oil viscosity, formation damage, and stress sensitivity are the most sensitive factors to the recovery degree. And, desirable tight oil production performance can be achieved with the application of the optimized bottom-hole pressure.