Abstract
The use of several types of drilling fluids is a compromise based on the need to maintain a given project of technological parameters (performance -inhibiting, rheological, tribological properties) during the drilling of unstable clay deposits, at the opening of the producing formation, to ensure a high quality of well casing, etc. This is especially true for the construction of wells with a horizontal and directional wells with zenith angle of unstable clay deposits of more than 70 degrees. A new type of emulsion drilling muds is developed, i.e. reversible invertible drilling mud (RIDM). RIDM is capable to change an emulsion type on a reciprocal (eversible) basis affected by a vatiety of chemical inverters; thus it can change its processing behavior from OBM to water-base solution and vice versa. The topic of discussion is methods and approaches used for transition oil-in-water emulsion into inverted (water-in-oil) emulsion and vise versa. Application of RIDM technical process is described. Process characteristics of RIDM are specified. Performance analysis of RIDM application in field conditions is given.
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