alexa State of Stresses: How to Simulate it Correctly in the Lab?
ISSN:2157-7463

Journal of Petroleum & Environmental Biotechnology
Open Access

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Editorial

State of Stresses: How to Simulate it Correctly in the Lab?

Vamegh Rasouli*
Vamegh Rasouli, Associate Professor, Petroleum Engineering Department, Curtin University, Australia
Corresponding Author : Dr. Vamegh Rasouli
Associate Professor
Petroleum Engineering Department
Curtin University, Australia
E-mail: [email protected]
Received October 19, 2011; Accepted November 16, 2011; Published November 18, 2011
Citation: Rasouli V (2011) State of Stresses: How to Simulate it Correctly in the Lab? J Pet Environ Biotechnol 2:e103. doi:10.4172/2157-7463.1000e103
Copyright: © 2011 Rasouli V. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

The state of stresses is significantly important in terms of its impact on oil and gas upstream activities. From practical point of view three principal stresses are assumed in a field. The vertical stress is due to the weight of overburden rocks. As the rocks are constrained in their movement underground horizontal stresses will be imposed to an element of rock: this is related to the vertical stress and its magnitude is a function of formation properties. The horizontal stress is unlikely to be equal in different directions due to the existence of fractures at different scales and different geological structures such as folds or anticlines. Therefore it is anticipated that the horizontal stress is maximum in one specific direction, perpendicular to which the minimum horizontal stress acts in the same plane. This is while most of the lab experiments, such as hydraulic fracturing and sanding studies are carried out on cylindrical shaped samples where horizontal stresses are identical: this is contrary to the real state of stresses as applies to the rock. To correctly perform lab experiments a cube of rock is to be used to which three independent stresses can be applied.

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