engleski

The Way to Reduce Pipe Wearing While Drilling

While drilling there is an additional load on the coiled tubing due to friction with the well walls/rocks regardless the drilling mode ; rotating or sliding. According to recent investigations fatigue is the major factor controlling the service life of coiled tubing. The rate of fatogue damage accumulation is affected by a number of operating factors: mechanical damage, corrosion damage, damage incurred by exceeding the ultimate capacity of the string, and damage due the cycling plastic strain fatigue. Determination of the actual friction coefficient is essential in defining the project technical feasibility. As the part of drilling system, drilling fluid can impact on the reduction of friction coefficient by implementation of lubricants. Selection of lubricants, their compatibility with drilling fluid and rocks was determined through laboratory testing. The results are shown and elaborated in the paper.

drilling; pipe wearing; lubricants

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