Numerical Simulation Characterization and Application of Interwell Non Condensate Gas for Offshore Thermal Recovery

Good development results have been achieved since the application of multiple thermal fluids huff and puff technology in Bohai heavy oil reservoirs. However, with the increasing degree of development, there is a more obvious phenomenon of interwell gas channeling, which greatly affects the overall effect of multiple thermal fluids huff and puff. Aiming at the problem of interwell non condensate gas channeling during the multiple thermal fluid in Bohai complicated fault-block oilfield, a mathematical model representation is researched in this paper by using numerial simulation software CMG-STARS for the establishment of interwell gas channeling model based on the in-situ data from the reservoir. Influence factors of gas channeling degree are analyzed from the aspects of reservoir basis, development modes and thermal injection parameters. Meanwhile, key factors that influence gas channeling degree most are screened out by way of multi-parameter sensitivity analysis. The research results show that the reservoir thickness, the vertical position of horizontal well and gas water ratio are the key factors affecting the degree of channeling. The analysis results play a guiding role in the development of non-condensate gas channeling treatment program.