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Article Dans Une Revue Petroleum Science and Technology Année : 2023

Stress release mechanism of deep bottom hole rock by ultra-high-pressure water jet slotting

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Hua-Jian Wang
  • Fonction : Auteur
Hua-Lin Liao
  • Fonction : Auteur
Jun Wei
  • Fonction : Auteur
Jian-Sheng Liu
  • Fonction : Auteur
Wen-Long Niu
  • Fonction : Auteur
Yong-Wang Liu
  • Fonction : Auteur
Zhi-Chuan Guan
  • Fonction : Auteur
Hedi Sellami

Résumé

To solve the problems of rock strength increase caused by high in-situ stress, the stress release method with rock slot in the bottom hole by an ultra-high-pressure water jet is proposed. The stress conditions of bottom hole rock, before and after slotting are analyzed and the stress release mechanism of slotting is clarified. The results show that the stress release by slotting is due to the coupling of three factors: the relief of horizontal stress, the stress concentration zone distancing away from the cutting face, and the increase of pore pressure caused by rock mass expansion; The stress concentration increases the effective stress of rock along the radial distance from 0.6R to 1R (R is the radius of the well), and the presence of groove completely releases the stress, it also allows the stress concentration zone to be pushed away from the cutting face, while significantly lowering the value of stresses in the area the drilling bit acting, the maximum stress release efficiency can reach 80%. The effect of slotting characteristics on release efficiency is obvious when the groove location is near the borehole wall. With the increase of groove depth, the stress release efficiency is significantly increased, and the release range of effective stress is enlarged along the axial direction. Therefore, the stress release method and results of simulations in this paper have a guiding significance for best-improving rock-breaking efficiency and further understanding the technique.

Dates et versions

hal-03936736 , version 1 (12-01-2023)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification - CC BY 4.0

Identifiants

Citer

Hua-Jian Wang, Hua-Lin Liao, Jun Wei, Jian-Sheng Liu, Wen-Long Niu, et al.. Stress release mechanism of deep bottom hole rock by ultra-high-pressure water jet slotting. Petroleum Science and Technology, In press, ⟨10.1016/j.petsci.2022.12.002⟩. ⟨hal-03936736⟩
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