Analysis of permeability transformation in the near-well zone and the well productivity when opening a formation by slotted perforation based on geomechanical modeling with account for the main structural elements of the well
UDC: 622.245.14
DOI: -
Authors:
CHERNYSHOV S.E.
1,
POPOV S.N.2,
DERENDYAEV V.V.1,
PROKHOROV V.V.1,
WANG X.3,
LIU H.3,
KARMAENKOV M.S.4
1 Perm National Research Polytechnic University, Perm, Russia
2 Oil and Gas Research Institute Russian Academy of Sciences, Moscow, Russia
3 School of Petroleum Engineering, China University of Petroleum, Qingdao, China
4 LUKOIL-Engineering LLC, Perm, Russia
Keywords: finite element model, borehole zone, perforation channels, reservoir rock, slotted perforation, permeability, well productivity
Annotation:
The authors of the article developed a finite element numerical model of a borehole zone with slot perforation channels. The model takes into account the dependence of rock permeability change on effective stresses as well as specifies contact elements at the cement–rock and cement–column contacts. Numerical calculations were performed to determine the stress distribution fields near the borehole with account for the difference between reservoir and bottomhole pressures. When modeling the values of the characteristics were used corresponding to the wells and terrigenous formations of oil fields in the south of Perm region. The analysis of the stress-strain state of the borehole zone proved the fact that areas with decreasing stresses (up to 69,2 %) were detected in the rock on the lateral surfaces of the slots, leading to 24 % permeability increase in these areas. Plotting the dependence of the change of the normalized well productivity coefficient on the depression revealed a 10 % decrease of this characteristic with a maximum depression of 12 MPa.
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