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Abstract The adaptive geological model differs from the deterministic one in that it takes into account the uncertainty of the initial data, has a degree of detail corresponding to the level of accuracy of the geological information, and reproduces the main regularities of the structure of the oil and gas object under consideration, primarily for the purpose of predicting its geology in undeveloped zones. At the first stage, adaptive geological models of separate layers identified by the results of detailed correlation of the considered object are constructed independently from each other, and then the single-layer models are summed up into a multilayer adaptive geological model of the object as a whole. With the adaptive approach, traditional methods of interpolation of geological and production data are not applied. The basis of adaptive geological modeling is the seismic data. The essence is that the seismic data vector is available both at the wells and at the points of the inter-well spacing, so any geological parameter can be calculated from this vector using a special fuzzy-logic function. At the same time, such function cannot be the same for the whole model polygon, so an additional so-called fuzzy-grid is developed. A grid with large cells, which contain local fuzzy-logic functions. Since fuzzy-logical functions are formed on the basis of geological and production information of the considered object, they can differ substantially for other objects. Thus, the mathematical apparatus of a geological model automatically modifies to the specific initial data, and therefore it is called adaptive. The calculated parameters of the adaptive geological model cells through which the wells pass are not necessarily the same as the actual well data. The reason is that these parameters are calculated using functions in which the initial data of neighboring wells participate. Deviations of calculated results from actual data characterize the degree of "defectiveness" of geological and production information. Thus, the adaptive geological model in comparison with the deterministic one gives a more meaningful result both about the geological structure of the considered object and the degree of reliability of its representation.
Abstract The obtained experience of using in carbonates of the Permian - Carboniferous high viscous oil reservoir of the Usinsk field the "classical" options of thermal methods of enhanced oil recovery such as steam cycling and steamflooding injection in a system of vertical wells, and steam assisted gravity drainage in a system of parallel horizontal wells has worse efficiency in comparison with sandstones. First of all, this is due to the inadequate sweep of a massive fractured reservoir with the steam-thermal action. In this regard, the paper proposes a new combined technology of three-dimensional steam assisted gravity drainage based on the conjoint use of horizontal injection and production wells cross-drilled to each other with the deviated production wells and the vertical production wells surrounding them. The paper presents the actual results of the pilot demonstrating that the proposed technology is a real alternative to the "classical" options of the thermal development of the inner zone of the reservoir and the results of hydrodynamic calculations obtained on the sector model of the other pilot which allowed to study the mechanism of the proposed technology more deeply, to optimize the operating modes of wells and their location in the reservoir, as well as to predict the effectiveness of its application in the geological and physical conditions of the reservoir edge zone.
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.34)
- Geology > Rock Type > Sedimentary Rock (0.34)
Results of Thermo-Hydrodynamic Modeling of Multiple Cyclic Steam Stimulations of Wells in the Permian-Carboniferous Reservoir of the Usinsk Field
Taraskin, Evgenii ((Lukoil-Engineering Ltd. - PechorNIPIneft)) | Ursegov, Stanislav ((Lukoil-Engineering Ltd. - PechorNIPIneft)) | Gerasimov, Igor ((Lukoil-Engineering Ltd. - PechorNIPIneft)) | Ruzin, Leonid ((Ukhta State Technical University))
Abstract The Permian-Carboniferous reservoir of the Usinsk field is one of the largest objects in the world with unconventional reserves of heavy oil. Despite the long history of the development of the reservoir (over 35 years), the cumulative oil recovery is less than 10.0 %. Difficulties in the development of the reservoir reserves due to non-Newtonian properties of the saturating oil with a viscosity of 700 mPa*s and a unique geological structure of a massive reservoir, which is represented by a 300 m carbonate strata of the Middle and Upper Carboniferous and Lower Permian age located at a depth of – 950 to −1500 m and underlained around the perimeter by the active aquifer. The prospects for increasing the oil production of the reservoir are associated with the introduction in the development with the help of innovative thermal technologies its poorly drilled edge area, in which almost one-third of all reservoir reserves is accomulated. This article is devoted to a discussion of the results of thermo-hydrodynamic modeling performed on the sector models and aimed at selecting the most effective option of the further development of the edge area of the reservoir, for which it is advisable to consider the use of multiple cyclic treatments of wells with radial horizontal bores by dry superheated steam in combination with the central hot water flooding into injecting wells.
- Phanerozoic > Paleozoic > Permian (1.00)
- Phanerozoic > Paleozoic > Carboniferous (0.91)