STRESS CHANGES IN CEMENTED BOREHOLE ANNULUS

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.