«Geology, geophysics and development of oil and gas fields»

Numerical modeling of transformation of reservoir rock permeability and wells productivity under the influence of changing stresses near cumulative perforation holes

UDC: 622.245.14
DOI: -

Authors:

¹ Perm National Research Polytechnic University, Perm, Russia
² Oil and Gas Research Institute Russian Academy of Sciences, Moscow, Russia
³ China University of Petroleum, Qingdao, Peoples Republic of China
⁴ LUKOIL-Engineering LLC, Perm, Russia

Keywords: finite element model, near-wellbore zone, perforation holes, reservoir rock, cumulative perforation, stress-strain state, permeability

Annotation:

A numerical finite element model of the near-well zone has been developed which includes a casing string, cement stone and a section of reservoir rock with perforation holes. A special feature of the model is the inclusion of contact elements at the casing string contacts with cement and cement with rock for a more reliable calculation of stresses when specifying a vertical load, as well as the simultaneous use of finite elements to simulate elastic (casing string and cement stone) and poroelastic (reservoir-rock) environments. The stress distribution near the cumulative perforation channels was obtained and, using the dependence of permeability on effective stresses, the change of this rock characteristic depending on the depression on the formation was determined. The change in the normalized well productivity coefficient in case of pressure drawdown increase is determined and it is shown that at its maximum value the well productivity can decrease by up to 15 %.

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