Geomechanical modeling of a near-wellbor zone with a slotted perforation, taking into account the elements of the cement sheath

UDK: 622.245.14

DOI: 10.24887/0028-2448-2025-10-38-43

Key words: slotted perforation, near-wellbore zone, finite element method, safety factor, production casing, cement stone

Authors: S.E. Chernyshov (Perm National Research Polytechnic University, RF, Perm); S.N. Popov (Oil and Gas Research Institute of the RAS, RF, Moscow); V.V. Derendyaev (Perm National Research Polytechnic University, RF, Perm); M.S. Karmaenkov (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm); X. Wang (China University of Petroleum, China, Qingdao); H. Liu (China University of Petroleum, China, Qingdao)

A numerical finite element model of a near-wellbore zone with a slotted perforation was created during the work, which includes a production casing, a cement stone and a reservoir rock section near the well. The model considers the dependence of changes in rock permeability on effective stresses, and defines contact elements at the cement stone – rock and cement stone – casing boundaries to exclude the occurrence of stress concentrators on the surface of the sections of these media. A multivariate numerical simulation of the stress-strain state of the near-wellbore zone was performed, regarding changes in the depression on the reservoir for the well that entered the terrigenous productive reservoir of one of the oil fields in the south of the Perm Region. It is shown that when creating slotted channels in the production casing, small areas of its destruction may occur in the upper and lower parts of the slots. The analysis of the stress state of the cement stone based on the Coulomb-Mohr criterion confirmed its stability even at a maximum depression of 9 MPa, the safety factor was 1,8. An analysis of the rock stability using the Coulomb-Mohr criterion showed that the reservoir should not be destroyed, and the safety factor was 1,1 with a depression of 9 MPa. The simulation results of slotted perforation show its effectiveness due to the appearance of rock discharge areas on the lateral surfaces of the cracks. The optimal operating mode of the well should be considered to ensure maximum productivity.

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