Development And Experimental Study On Shell Of Heating Head In Melting Ceramic Casing Technology

With the rapid development of economy in our country after entering the newcentury, geological drilling industry has entered a new stage of development. Sincedeeper and more complicated drilling workload is increasing at a rapid pace, it leadsto the fact that the sidewall instability phenomenon occurs more frequently, a majormanifestation of sidewall instability is drilling leakage. Plugging problem of thesidewall has been a challenge for the drilling engineering field, it affects theefficiency of the exploration and utilization of mineral resources directly. Therefore,solving the plugging problem of the sidewall effectively is of great significance fortoday’s increasingly scarce resources environment. It is a long-term and difficultmission for drilling researchers to carry out further and innovative researches. A studyon a new method of supporting sidewall-hot melt casing wall method is carried outin the project.The hot melt casing wall technology as a new kind of technology in the drillingengineering field, has its unique advantage and broad prospects for development. Thethesis enumerates the geological factor, mechanical factor and drilling engineeringtechnology three main factors from the perspective of factors affecting the stability ofstrata and comparative analyzes the traditional technologies’ advantages anddisadvantages and then discusses the principle, development history, advantage andmain research orientation of the hot melt casing wall technology based on the hot meltdrilling method. At the same time, through combining with experiments, this paperdesigns a structure of a heating element shell and optimizes the structure. The materialselection for the heating element shell is the focus of the paper. It proves that theperformance of the deformation of GH742nickel-base super alloy can meet therequirements within the temperature scope of700°C and the alloy can be used tomake the shell. After conducting an oxidation resistance experiment with GH742under high temperature environment, the paper verifies that GH742has a feature ofoxidation resistance. Using ABAQUS software to simulate the hot melt temperature field in the soil, and then measuring the formation temperature field of the hot meltshell in the real experiment, through the comparative analysis, the study concludesthat the fusible cementing material layer is the main energy consumption area, the theresearch selected fusible cementing material’s coefficient of thermal conductivity iswith the temperature rising within the range500-800°C, changing the coefficient ofthermal conductivity of the heating element has a little impact on the steady-statetemperature field, etc.In the future study, researchers can make an experiment with the hot melttechnology in the field, and contrast with the simulation results to further optimize thestructure and material selection of the hot melt head shell.