Improving the efficiency of hydrocarbon recovery from the subsurface largely depends on the development systems, technologies and quality of the productive strata opening. One of the methods for intensification of production and completeness of oil recovery is underbalanced drilling-in using horizontal and horizontal-branch wells. For these conditions the choice of flushing solution and regulation of its structural and rheological properties at a given level is fundamental.
The issues of drilling and construction of wells under unequal components of rock pressure in saline sediments are considered. The main factors that reduce the stability of the wellbore are given. Reflects the issues associated with the choice of the type of drilling fluid to exclude harmful manifestations of rock pressure.
