Prevention of Hysteresis Phenomena During Filtration of Carbonated Oil in Reservoirs with Irreversible Deformation of Rocks in Overlying Fields

Abstract

Summary In the area of carbonated liquid movement, the indicator line enhances its curvilinear character, which occurs due to the influence of the two-phase flow, with the assumption of a significant decrease in the oil saturation pressure with gas. To correctly interpret the data from the wells survey at steady-state modes of their operation, it is necessary to know the “history” and the nature of the pressure change around the investigated well; in the course of hydrodynamic studies, it is necessary to determine the parameters of both the forward stroke curve, with a decrease in bottomhole pressure, and reverse stroke, with an increase in bottomhole pressure. It is recommended to set the operation mode of wells in a reservoir in such a way as to prevent a significant irreversible change in permeability around a working well. Therefore, reservoir pressure should be maintained at the appropriate optimal level by various methods of stimulating the reservoir, as shown in Figure 2. Almost any reservoir rocks during the development of deep oil and gas fields, as well as sands containing a significant amount of clay cement during the development of fields located at almost any depth, have plastic deformation. The obtained universal dependences are in good agreement and are explained by laboratory experiments. The obtained dependencies can be used in the interpretation of the results of the study of wells and formations and in determining the development indicators of fields with elastoplastically deformable reservoirs, as well as in the preparation of design documents and solutions of engineering problems.