The water resource industry focuses on extracting ground water for multiple purposes including municipal wells, industrial consumption, and wells for Agri-Irrigation. It is boosted by population growth trends in Sunbelt states and an increasing number of acres devoted to agriculture. Environmental considerations continue to increase when drilling water wells in urban areas and has seen a strong trend to the use of RC drilling as it enables effective control of the cutting and drilling fluids. It is essentially a closed loop system that safely contains the cuttings and minimizes potential contamination in environmentally sensitive areas. The mining industry also uses large diameter RC tools for large diameter wells to process ore and to dewater areas adjacent to open pit mines.
WO2004046505A2 - Bottomhole assembly - Google Patents
Large Diameter Reverse Circulation Archives - Matrix DrillingMatrix Drilling
The paper describes the engineering and technology solutions that used in the well with non-standard casing design and geological conditions on West-Yurkharovskoe field. Drilling characterized by low ROP, high risks of downhole tool failure and problems with wellbore stability. The geological structure is quite complex with coal-zone, high-pressure zones with abnormal pore pressure equal 2. For successful accomplishment of the project objectives and minimization runs number was carried detailed analysis geological data, possible complications, experience of drilling wells on West-Yurkharovskoe field.
A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid via the mud pumps and torque via the kelly drive or top drive to the drill bit. The term is loosely applied to the assembled collection of the smuggler pool, drill collars , tools and drill bit. The Bottom Hole Assembly BHA is made up of: a drill bit , which is used to break up the rock formations ; drill collars , which are heavy, thick-walled tubes used to apply weight to the drill bit; and drilling stabilizers , which keep the assembly centered in the hole.
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