Volume 53

Feasibility Study and Parameter Optimization of CO2 Injection Technology in Heavy Oil Field Yihe Zhang, Xiaoyan Wang, Xinwei Liao, Wenchang Wang, Yang Zhang, Haifeng Wang

Abstract

CO2 injection technology is a widely used extraction method for conventional and unconventional oil reservoirs. This technology can further achieve carbon sequestration and carbon neutrality on the basis of improving recovery efficiency. Under the guidance of the above ideas, firstly, theoretical methods are used to analyze the feasibility of various CO2 injection technologies. Among the composite CO2 technologies, CO2 flooding after CO2 huff-n-puff has better applicability compared to other technologies. Secondly, numerical simulation methods are used to optimize the technical scheme design of the block. After optimizing the parameters of single factor gas injection, conventional gas injection, mixed gas injection, water gas alternation and other injection methods are optimized. The results show that the optimal single factor CO2 injection scheme can increase the final recovery rate by 13 percentage points compared to water drive; The water to CO2 ratio is 1:1, and injecting water to air circulation in a 3-month cycle can achieve optimal results. In the current context of carbon neutrality, the scale of CO2 injection applications will continue to expand, and this research will also provide technical support for the promotion and application of CO2 injection technology.

Keywords CCUS, CO2 composite injection technology, heavy oil reservoir, field application, enhanced oil recovery