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Original scientific article

STRESS CHANGES IN CEMENTED BOREHOLE ANNULUS

By
Zvonimir Bošković ,
Zvonimir Bošković

Rudarsko-geološki fakultet, University of Belgrade, Belgrade, Serbia

Vladimir Čebašek
Vladimir Čebašek

Rudarsko-geološki fakultet, University of Belgrade, Belgrade, Serbia

Abstract

Cemented boreholes annulus its stability achieved tightness must be maintained in the continuation phase of drilling, is that in the process of drilling, cementing, production. Preserving stability in the working life of the wells threatened and technological stage of the production process due to the natural development of conditioned stress-laden formation (swelling) and a reduction of fluid volume in the reservoir and operational procedures (from moderate to high pressures and temperatures, as well as - technical interventions (changes type of working fluid, leaking testing, perforating, injection, hydraulic fracturing, other operations). From cement mixture composition depend on the mechanical properties of hardened cement stone. Increase elasticity is associated with a reduction in the compressive strength and must always check that the compressive strength of cement stone ensure the stability of pipes due to well working life.

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