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.
