Justification of impact and planning of technology efficiency on the basis of limy-emulsion formulation in low-permeability highly-rugged reservoirs of Tyumen deposits

Abstract

Abstract Justification of the effective chemical methods and technologies for oil production increase of highly rugged low-productive reservoirs is a relevant area of focus. The primary objective in this area is to justify the selection and planning of technologies of injection of chemical agents for field-geological factors of Tyumen deposits. Tyumen deposits are characterized by a high degree of heterogeneity of the structure and are represented by irregularly discontinuous interlensing of sandstones, aleurolites, clays and coals. High internal heterogeneity of the reservoir determines abnormally low permeability (on the average less than 6 mD) and weak pressure communication in the bed. Due to the complex geological structure there has been an intensive production decline, decreasing of injectivity and initially high water cut of production during well operation. In order to increase the production stimulation and injectivity at the operating wells, more than 50 exposure technologies have been tested. The main scope of work on wells with injectivity less than 120 m3/day is performed by injection of surfactant-containing and emulsion formulations. Factors determining the efficiency of applied technologies in Tyumen deposits were studied. It is necessary not only to consider and compare the achieved efficiency of certain technologies, but also to continue searching for new chemical formulations to increase oil production of highly-rugged low-productive reservoirs. The paper presented an algorithm for analyzing the results of operations conducted at the injection wells.