Key Engineering Materials Vol. 785

Abstract: To increase the development efficiency of reservoirs, methods to intensify inflows and enhance oil recovery are applied. The geological and field experience of applying these methods shows that a high technological effect can be reached in specific geological and geophysical conditions while in other conditions efficiency will be insignificant. In this relation, an important solution for this problem is the justification of selecting the most efficient technologies of stimulating pay zones. The research objective is to select the most optimal technologies of stimulating pay zones to increase the development scope and enhance oil recovery. Using geological and field analysis, a complex quantitative assessment was done for the efficiency of using methods to enhance oil recovery and stimulate pay zones in both production and injection wells.

Abstract: Efficient development of oil reservoirs includes measures to restore and enhance the porosity and permeability properties of reservoir units that are gradually impaired during well operation. As a rule, various technologies of bottom-hole formation zone processing (BZP) of wells are used for these purposes. Special requirements to BZP technologies are applied during interventions in low-permeability reservoirs where the geological structure of reservoir units has the highest impact on the efficiency of works. In this relation, it seems interesting to study the specifics of geological structure of reservoir units in a laboratory for the efficiency of interventions using physical and chemical methods of reservoir stimulation. The research objective is to assess the efficiency of processing reservoir units with acid compositions of various concentration and type. Using laboratory experiments, physical and chemical parameters were quantitatively assessed that characterize the speed and depth of interaction between acid compositions and reservoir units.

Abstract: One of the most important aspects in the activities of oil companies in the Western Siberia is to improve the effectiveness of water-flooding as the main method of impact on the formation. This is due to the fact that at the present time reservoirs of a complex structure with difficult to recover reserves prevail among newly introduced development objects, the extraction of which is extremely difficult using a simple method of water injection volumes regulation. First of all, this refers to reservoirs of Jurassic deposits, which are characterized by the most complex geological structure and porosity and permeability properties. A promising direction in improving the water-flooding system at such objects is the use of physical and chemical technologies to enhance the oil recovery of formations, and primarily, referring to the diverter technology. The research objective is to evaluate the effectiveness of using “hard” type diverter compositions to enhance oil recovery of formations. With the help of detailed oil-field analysis and field-geophysical studies, the nature of the development of oil reserves for Jurassic development sites has been assessed.

Abstract: The Roslavl license block is one of the main assets of "RussNeft" company. Some particular perspectives of enhancing oil recovery are connected with this territory. The work objective was to define the perspectives of geological exploration, find new hydrocarbon deformational traps, and specify the geological structure of the already-known oil reservoirs in the Neocomian sediments, the Achimov strata, and Middle Jurassic sediments. The data analysis is necessary to create a new promising exploitation drilling program. The Roslavl license block is considered to be one of the most difficult and interesting areas in the sphere of hydrocarbon saturation perspectives from the quantitative aspects viewpoint. Different expectations on enhancing oil recovery in the Middle Ob oil and gas province of West Siberia are connected with this license block. Therefore, these perspectives were evaluated with the help of deep analysis of shooting data collected by seismic crews in different years, and the results of drilling. Different archival geological and geophysical evidence was analyzed to offer recommendations on the following geological exploration.