The effect of fractures on gas injection in Hailar oilfield

• Main Authors: Changhao Wang, Shibin Li
• Format: Article
• Language: English
• Published: SpringerOpen 2018-06-01
• Series: Journal of Petroleum Exploration and Production Technology
• Subjects: CO2 flooding; Fracture; Gas channeling; Finite element numerical simulation; Fluid–solid coupling
• Online Access: http://link.springer.com/article/10.1007/s13202-018-0475-y

Abstract The channeling of CO2 gas is affected by the development of reservoir fractures. In order to improve the gas injection effect, the finite element numerical analysis software Comsol Multiphysics combined with the fluid–solid coupling theory was used to establish the three-dimensional geological model of the Hailar Bei 14 block, and the geostress of the study block was inverted. According to the failure criterion of rocks, the natural fractures of the block are predicted, and the distribution characteristics of artificial fractures are obtained by combining the fracturing situation and fracturing time sequence. Based on the simulation of the pressure field and flow field distribution of the Bei 14, the main effect of the fractures on the gas injection is revealed. The reason of the gas channeling in the Bei 14-X51-59 well is analyzed, which provides an important basis for the formulation of the CO2 flooding scheme.