Simulation of boost path and phase control method in supercritical CO2 pipeline commissioning process.

CO 2 pipeline can be applied to Enhanced Oil Recovery (EOR) projects and CO 2 geological storage projects, and has high engineering application value. However, pipeline transportation of CO 2 is a high-risk link in CO 2 storage projects. The phase state commonly used to transport CO 2 is a supercritical state with both gaseous and liquid characteristics, and there are also great challenges in the field of pipeline transportation. The existing researches have carried out a lot of exploration and application development in the heat transfer, phase change, transient and special conditions of supercritical CO 2 pipeline operation. In this paper, the modeling and exploration of the commissioning process before the formal operation of the supercritical CO 2 pipeline are carried out, and the boost path of the supercritical CO 2 pipeline in the phase diagram under different working conditions is obtained. The model developed in this paper is based on the sensitivity analysis of the effects of variables such as ground temperature, filling pressure speed, and whether to perform pressure-stabilizing leak detection operations. The step-up path in the phase diagram of the CO 2 pipeline commissioning process and the adjustment control method are obtained. And the critical temperature of each working condition that cannot avoid phase transition, thus contributing to the existing knowledge system in this field. [ABSTRACT FROM AUTHOR]