About loss of structural stability during movement of drilling fluids

The analysis of scientific research conducted in recent years shows that the drilling fluids used in the drilling of oil and gas wells can be described by different rheological models. These models do not take into account structural stability and relaxation time of drilling fluids. Currently, in most cases, these drilling fluids are characterized by visco-plastic (pseudo-plastic) properties depending on the different basis and composition. Despite the above, considering the existence of the fact that they have structural stability which determines its internal characteristic and relaxation properties which determines how quickly the fluid responds to changes in stress or deformation during the movement of drilling fluids and the importance and relevance of their attention, the article deals with the issues of rheological modeling of such systems and taking into account the violation of their structural stability. These properties must be taken into account because problems of increasing the efficiency of technological processes during well drilling can be further complicated due to the complex structure and relaxation properties of the applied drilling fluids. In the article, it is proposed to use the generalized exponential model for the description of 10 different oil-based drilling fluids and 8 different waterbased drilling fluids in the presence of shear deformation. As a result of the rheological test of oil-based drilling muds and water based drilling muds of different compositions on the basis of the mentioned model, the possibility of determining their structural stability coefficient and relaxation time has been shown.