Numerical simulation of influencing factors of U-shaped geothermal well
Middle-deep geothermal is the potential area of geothermal resources development in the future.U-shaped geothermal well is an important means to realize the efficient development of middle-deep geothermal resources.Based on the geological and reservoir data of the region of Eastern Henan Province,a 3 000 m deep U-shaped geothermal well is studied.The physical model of coupling U-shaped geothermal wellbore and surrounding strata is established by using multi-physical field numerical simulation software.The influence of well construction parameters on wellhead temperature and heat extraction is studied through numerical simulation.The results show that the reasonable horizontal section length is about 1 000 m,the inner diameter of pipeline is 177.8 mm,and the insulation section length is 1 500 m under the condition that the user load is satisfied.The pipeline inner diameter and horizontal section length affect the temperature disturbance breakout time of the horizontal heat extraction section,and the wellhead temperature is stable before this time.The formation temperature around the rising section of U-shaped geothermal well has three changing areas of"decrease,balance and rise",and the reasonable length of insulation section should not exceed the balance area.
U-shaped geothermal wellwellhead temperaturethermal power extractionnumerical simulation
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