Design And Research On Simulation Test Shaft Of High Temperature And High Pressure

In recent years, with the continuous development of petroleum exploration and technology, the number of deep and ultra-deep well increased, the proportion reached more than 30%. With the increase of depth, the temperature and pressure of bottom hole also increases when the depth reaches 5000 m above, the pressures can reach up to 50 MPa or more, construction pressures can reach up to 80 MPa or more. In particular, the oil temperature can reach up to 200℃ and pressure can reach up to 140 MPa or more in the late stage of oilfield development. Such a high temperature and pressure environment for down hole tools indicates a higher requirements, conventional oil and gas well down hole tools are difficult to achieve the performance requirements.For the development of new high-temperature and high-pressure down hole tool requirements, this paper designed a high temperature and pressure simulation test system that can simulate down hole pressure and temperature environment, the maximum test pressure is 105 MPa and the maximum temperature is 200℃. Through the movable loading device, experimenters can complete the tension, compression and torsion load simulation of the down hole tools. Simulation test shaft of high temperature and high Pressure system is mainly composed of oil bath heating system, floor heating system and wellhead seal suspension system.Firstly, according to the basic requirements of the test system, the test borehole overall program design, pressurized systems and heating systems to determine the separation scheme. Seamless steel pipe-type single- cylinder form, carried on the wellbore wall thickness selection and calculation and finite element analysis software ANSYS/Workbench hole wellbore pressure and overall stress analysis. Secondly, designed the heating system, using an oil bath heated manner and completed oil bath wellbore structure design and insulation layer design. To verify the heating efficiency of oil bath heating system and to test the medium and the tool combination within the wellbore, using ANSYS/FLOTRAN simulates the heat balance of oil bath heating system, the result of simulation shows that the system can reach a predetermined test temperature in required time. Again, design the ground heating system, complete the design of the heating process, the heater power calculation, oil pump selection, design and selection of expansion slots, storage tanks and other accessories. Finally, the test borehole wellhead seal suspension design, completed wellhead flange design, combined sealing wellhead selection, and completed the trial wellbore bolt check. The design of high temperature and pressure simulation wellbore system in this article can complete a variety of simulation experiments of down hole tools, there is an great significance to the development of new down hole tools.