Study on Temperature Field of Thermal Cracking Drilling Flow Field under the Condition of Bottom Hole Submerged Jet

In the deep well bottom hole environment, there are several different substances in the process of pyrolysis drilling, such as high temperature supercritical jet medium, cooling water and cuttings, which can be considered as submerged non-free jet of supercritical fluid in low temperature environment. From the energy point of view, there are heat transfer between supercritical fluid and cooling water, heat transfer between supercritical fluid and bottom rock surface, and heat transfer between up flow and well wall. Due to the complexity of the components, the transfer process of these energies is very complex, which has an important impact on the efficiency of thermal cracking drilling. Therefore, it is of great significance to study the heat transfer law under the condition of bottom hole submergence.