Problem analysis of geotechnical well drilling in complex environment

Scientific and Technical Challenges in the Well Drilling Progress

Kasenov, A.K.^1 ; Biletskiy, M.T.^1 ; Ratov, B.T.^1 ; Korotchenko, T.V.^2

Kazakh National Technical University after K.I. Satpaev, Almaty, Kazakhstan^1

National Research Tomsk Polytechnic University, Tomsk, Russia^2

关键词: Clay particles;    Complex environments;    Cutting sizes;    Drilling problems;    Large cross-sections;    Monitoring wells;    Physical factors;    Problem analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/24/1/012026/pdf
DOI  :  10.1088/1755-1315/24/1/012026

来源: IOP

【 摘 要 】

The article examines primary causes of problems occurring during the drilling of geotechnical wells (injection, production and monitoring wells) for in-situ leaching to extract uranium in South Kazakhstan. Such a drilling problem as hole caving which is basically caused by various chemical and physical factors (hydraulic, mechanical, etc.) has been thoroughly investigated. The analysis of packing causes has revealed that this problem usually occurs because of insufficient amount of drilling mud being associated with small cross section downward flow and relatively large cross section upward flow. This is explained by the fact that when spear bores are used to drill clay rocks, cutting size is usually rather big and there is a risk for clay particles to coagulate.