There are many methods of enhanced oil recovery and stimulation of oil inflow, and in order to find their most effective application, it is necessary to study the object of works, candidate wells, as well as their impacts on these wells. One of the methods of production intensification, which makes it possible to improve profitability of oil extraction, is hydraulic fracturing.
The paper provides data on chemical composition of formation water and injected water of the Verkhnechonsky Horizon and reviews differences between them. It describes results of in-field observations of inflow of formation and injected waters into producing wells and associated halite depositing during oil and gas production. A summary of causes for halite plugging in the downhole equipment is provided. Estimation of skin factors and productivity ratios are done for cases of halite redeposition in bottomhole zones of the formation. Technological solutions for assurance of halite deposition control during oil and gas production in the Verkhnechonskoye Oil and Gas Condensate Field are described. The actual data are compared to data available from publications on the problem of halite/chloride depositing during oil production. A theoretical basis is proposed for understanding of geochemical processes of halite depositing in the bottomhole zones in the Verkhnechonskoye Field.
The Verkhnechonskoye Oil and Gas Condensate Field (hereafter the VC Filed) is located in Katanga District of the Irkutsk Region in East Siberia (Extreme North Area). The main oil and gas reservoirs are placed in the Verkhnechonsky Horizon (83% of recoverable reserves). (Figure 1). Figure 1Scheme of faults and formation borders in the Verkhnechonskoye Field
The purpose of the research is to analyze the lithological and facies conditions of formation and the causes of lithological composition variability of the Yarakta horizon deposits as well as formation and distribution features of reservoir rocks in the horizon. The paper uses the data on drilling and geophysical work results and research materials from the public sources. The Yarakta horizon is commercially productive in the deposits of the southeastern slope and the central part of the Nepa-Botuoba anteclise: Dulisminskoe, Yaraktinskoe, Ayanskoe, Danilovskoe deposits, etc. The deposits of the Yarakta horizon were formed during the initial transgressive stage of the Vendian sedimentation cycle and are characterized by extreme lithological irregularity of rock composition and thickness. Investigations of a number of scientists testify that in the early formation of the Yarakta horizon its territory in geomorphological terms was predominantly presented by a coastal plain, which was occasionally flooded by the sea. The rocks in the area are represented by the facies of temporary proluvial-deluvial flows of the coastal plain replaced by coastal shallow sediments. The change in the lithological composition of rocks and thicknesses of the Yarakta horizon is a result of changes in the nature of oscillatory movements, while its structural and textural features are determined mainly by the dynamics of water flows of the sedimentation medium and the paleorelief nature of the underlying surface. The conducted research allows to conclude that lithological heterogeneity of the Yarakta horizon in sections (vertically) and along the strike (laterally) is determined by the frequent alternation of various lithotypes, the formation of which is determined by the complex nature of tectonic movements and irregularity features of sedimentary layer facies.
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