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Conference Papers Year : 2023

Design and Experimental Study of Intensifier for Deep Geothermal Drilling

Yuhang He
  • Function : Author
Hualin Liao
  • Function : Author
Hedi Sellami
John-Paul Latham
  • Function : Author
Jiansheng Xiang
  • Function : Author
Laurent Gerbaud

Abstract

The rock of deep geothermal reservoir has the characteristics of high in-situ stress, high strength and high abrasiveness, which leads to slow ROP and low drilling efficiency during the drilling process of geothermal resource development. Ultra-high pressure jet slotting can effectively release local stress at the bottom-hole area and improve the rock-breaking ability during drilling. Therefore, in order to increase the pressure of the jet as much as possible and form an effective slotting at the bottom of the well, this paper designs an efficiently downhole intensifier device directly driven by the energy of the drilling mud. The parameters affecting the supercharging performance and stagnation pressure of the intensifier are analyzed by means of CFD simulation, and the output characteristics of the intensifier are tested by means of laboratory experiments. The results show that the greater the ratio of the input pressure to the piston area of the pressurizing chamber and the greater the output pressure, and the faster the working frequency of the intensifier. Increasing the stroke of the piston can prolong the holding time of the high-pressure water jet. laboratory test results show that the output pressure waveform of the intensifier is square wave, and the area ratio of the supercharger chamber is approximately equal to its supercharger ratio Compared with conventional geothermal drilling methods, the ultra-high pressure jet generated by the intensifier studied in this paper is coupled with the mechanical shock, which can provide a new deep geothermal drilling speed-up method and technology, So it can provide a theoretical and technical support for promoting the efficient and low-cost exploitation of geothermal resources.
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Dates and versions

hal-04437361 , version 1 (04-02-2024)

Identifiers

  • HAL Id : hal-04437361 , version 1

Cite

Yuhang He, Hualin Liao, Hedi Sellami, John-Paul Latham, Jiansheng Xiang, et al.. Design and Experimental Study of Intensifier for Deep Geothermal Drilling. World Geothermal Congress, Sep 2023, BeiJing, China. ⟨hal-04437361⟩
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