COMPARISON OF DRILLING MUDS ON VARIOUS MUD POWDER FOR DRILLING BY NNB METHOD
Comparative researches the polymer-clay drilling muds of the mud powder prepared with use with a solution output from 5 m<sup>3</sup>/t to 40 m<sup>3</sup>/t different domestic manufacturers for NNB of underwater transitions of the main gas pipelines are conducted. Based on measurements of technological figures of quality of drilling mud (density, the conditional viscosity, an index of static filtering, a ratio of dynamic stress of shift and plastic viscosity, friction coefficient, static stress of shift) it is set that by NNB method conform to the modern requirements for polymer-clay drilling mud prepared on mud powder with a solution output more 20 m<sup>3</sup>/t.