A two-dimensional visualization physical simulation device of high temperature and high pressure is designed and developed. The device separates the temperature-resistant and pressure-resistant parts by applying over pressure to the visual model. The inner model body can withstand temperature but can not withstand pressure, while the outer pressure chamber can withstand pressure but can not withstand temperature. Moreover, the pressure between the inner and outer layers keeps balance and heat insulation, so as to realize the visual simulation of high temperature and high pressure. The experimental results show that the overall device test meets the design requirements, the maximum test pressure is 20 MPa. The sweep of the temperature field displayed by the experimental data acquisition device is basically consistent with that of the actual visual observation. Using the design concept of high pressure chamber, the high temperature and high pressure visual simulation is realized, which meets the demand of offshore heavy oil thermal recovery and plays an active role in the research of process mechanism.
Heavy oil resources in Bohai Oilfield are huge, accounting for nearly 80% of the total resources (Wang, 2019), mainly distributed in Luda, Nanpu, Suizhong, Chengbei and other oil areas. Thermal recovery of heavy oil has been widely applied in heavy oil fields at home and abroad due to its good effect on heavy oil development. It has formed with thermal recovery huff and puff and thermal flooding as the main development methods for thermal recovery technology (Yu, 2001). In recent years, the thermal recovery technology has been applied on offshore oil fields, and the multi-component thermal fluid huff and puff technology (It is called MCTF for short) is a newly developed thermal recovery technology for offshore heavy oil (Sun, 2020).The current development trend of thermal recovery technology is compound thermal recovery, and MCTF is where fuel combusts and water is heated and vaporized, generating the multi-component thermal fluid including hot water/steam, N2 and CO2. Composition of the mixture produced by the generator varies with temperature and pressure,which has the characteristics of gas miscible flooding (nitrogen flooding, carbon dioxide flooding) and thermal oil recovery (Tang, 2011; Lin,2012a; Lin, 2013; Lin,2012b).
