Abstract
This article describes the results of physical modeling of deformation and filtration processes in low-permeability reservoir rocks of the Achimov deposits of the Urengoy gas condensate field. The experiments were carried out on a unique true Triaxial Independent Loading Test System (TILTS) of the Institute for Problems in Mechanics of the Russian Academy of Sciences. The effect of the non-uniform triaxial stress state on the character of deformation and filtration processes in rocks was studied. Real stresses that occur in the bottomhole formation zone when the pressure in the well decreases were created in the rock specimens. Experiments were carried out to simulate the stress state at the walls of the open hole and at the tip of the perforation hole. The geomechanical approach is shown to be promising for creating ways to improve the quality of wells; in particular, the adaptation of the directional unloading method for the conditions of a given reservoir is considered. These studies are essential both in fundamental scientific and practical terms to substantiate technological solutions in the development of fields with low-permeability reservoirs.
Highlights
Today, the problem of depletion of hydrocarbon reserves is becoming increasingly urgent around the world
A laboratory modeling method for studying the effect of the stress-strain state that occurs near a well with different bottomhole designs on the filtration characteristics of reservoir rocks is described in this paper
The results of testing rock specimens from the Achimov deposits of the Urengoy gas condensate field on the Triaxial Independent Loading Test System (TILTS) allow to draw a number of practically important conclusions
Summary
The problem of depletion of hydrocarbon reserves is becoming increasingly urgent around the world. Large and accessible deposits are mostly depleted. Under these conditions, the development of deposits with hard-to-recover reserves becomes especially significant [1]. One of the main indicators of "hard-to-recover" reserves is the low permeability of rocks. The development of hydrocarbon reserves in low-permeability reservoirs, including deep-lying deposits, is complicated by the low productivity of production wells and their high cost. Such reserves cannot be efficiently extracted using traditional development methods due to geological and technological reasons [2]. It is necessary to create new lowcost methods with a long-term effect of increasing the productivity of wells in lowpermeability formations. The creation of methods to reduce the risk of uncontrolled destruction of the bottomhole formation zone is important
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