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The cementing of wellbores is of the utmost importance at each stage of the drilling jobs. Regardless the conditions in the well, the aim of the cementing job is to efficiently seal the annular space between the casing and the wellbore wall, and to liquidate absorptive zones and also the flow of fluids in the annulus. The properly performed cementing job guarantees successful and safe exploitation of the well. A correctly performed cementing job in a borehole depends on the design of the borehole, geologic-reservo...

Drilling fluid significantly affects all technological operations in the process of deposit drilling and completion. The main task done by the drilling fluid is providing proper drilling and cleaning of the hole bottom from cuttings as well equilibration of the rock mass pressure, cooling and cleaning the drill bits. Moreover the drilling fluid should minimize the damage to the permeability of productive deposits in the near-well zone and maintain stability of the wellbore walls. For providing the correct protecti...