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

Numerical modeling and analysis of well stability during cumulative perforation

UDC: 622.245.14
DOI: 10.33285/2413-5011-2023-9(381)-68-74

Authors:

¹ Perm National Research Polytechnic University, Perm, Russia
² Oil and Gas Research Institute Russian academy of Sciences, Moscow, Russia
³ Perm State National Research University, Perm, Russia

Keywords: finite element model, near-wellbore zone, cement composition, cement stone, cumulative perforation, stress-strain state, failure zone

Annotation:

An axisymmetric finite element model of the near-wellbore zone has been developed, which includes a column, cement stone and reservoir rock that allows setting a nonlinear pressure distribution inside the well, simulating a shaped charge explosion during perforation. An approximating function was determined based on the real data of pressure measurements during cumulative perforation. Numerical modeling of the stress-strain state of the near-wellbore zone was carried out taking into account the pressure distribution according to the power function. Applying the Mohr – Coulomb failure criterion, the possible zones of destruction of cement stone for its three different compositions were assessed. It is, shown that depending on the applied cement material, different areas of destruction can occur. Analysis of the column stability proved the fact that the obtained stress values should not lead to its failure.

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