Wells with high strength carbonate reservoir formation generally practice open hole completion strategy. It allows to substantially reduce expenditures and risks associated with well construction. At the same time, borehole stability during well's exploitation depends on strength properties on the one hand, and stresses which rocks are withstanding during production on the other. In its turn stresses depend on many factors, related with geological aspects and are controlled by drawdown pressure applied to reservoir. Nowadays all main components for well stability can be identified with logging data, core information and software tools for modeling and computation. In order to improve reservoir quality, quite often a near wellbore area is treated with different chemical agents and compositions. Unfortunately, a few people bear in mind, that after the chemical reaction rock might overcome significant changes as it weakens and deforms. This paper describes practical application of geomechanical modeling with Mechanical Earth Model construction [2] and reservoir stability evaluation of horizontal well section with the open hole completion before and after acid treatment with different depressions. [1]. In order to determine petrophysical and mechanical properties changes before and after acidizing, mechanical tests were conducted on the core samples from Bashkirian horizon. Results were used as a basis for justification and open hole completion optimization strategy.
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