«Oilfield engineering»

Prediction of the ultimate elastic state of rock samples during loading under volumetric compression

UDC: 622.276.031.011.43:53.091
DOI: -

Authors:

¹ Core and Reservoir Fluids Research Center, LUKOIL-Engineering Limited PermNIPIneft Branch Office in Perm, Perm, Russia

Keywords: geomechanical studies, elastic-deformation characteristics, elastic limit, modulus of elasticity, rock, core

Annotation:

Determining the parameters characterizing rocks elastic-deformation and strength properties is one of the main tasks of geological-mechanical research. The data obtained as a result of such studies can be used when developing geological-mechanical models of rock formations used in hydraulic fracturing design, drilling design as well as other well or construction work performed in difficult geological conditions requiring information on the effect of changes in the rock massive stress-strain state on rocks elastic and strength properties.

The high-quality research modeling, performed in laboratory conditions, the processes of changing the mineral skeleton structure as a result of the exposure to enhanced oil recovery technologies, requires excluding the possibility of violation of the rock core model (sample) microstructure as a result of a micro-cracks system development directly during testing in order to determine elastic-deformation properties. To ensure the specified preservation of the mineral skeleton microstructure, it is necessary to prevent exceeding the limit of the rock elastic state and the manifestation of plastic deformations when loading the sample.

That’s why it is necessary to develop a methodological approach to determining criteria indicating the achievement of the rock ultimate elastic state during the sample loading by axial pressure under conditions of volumetric compression.

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