Flow of gas-condensate system in a time-dependent deformable reservoir with rock creep effect in the well Bottomhole zone

Document Type : Research Paper

Authors

1 Institute of Applied Mathematics, Baku State University, Baku, Azerbaijan.

2 SOCAR Oil Gas Scientific Research Project Institute, Baku, Azerbaijan.

3 Military Institute named after Heydar Aliyev, Baku, Azerbaijan.

4 Faculty of Mathematics, Statistics and Computer Science, University of Tabriz, Tabriz, Iran.

Abstract

 The problem of ow of a gas-condensate system to a draining from a time-dependent deformable formation is considered in the case where the laws of compressibility of reservoir rocks in the bottomhole zone and in the part of the reservoir remote from the well differ. Using the idea of a binary representation of a gas-condensate system, a semi-analytical solution to the considered problem is obtained, an algorithm is proposed for calculating the main indicators of depletion of a gas-condensate reservoir, for the case when near the well (inner zone) the formation undergoes creep, and in the distant part of the reservoir (outer zone) elastic deformation occurs. Based on this algorithm, a computer simulator of the considered process created. The results of a study of the influence of the noted factor on the main indicators of the depletion process of gas-condensate deposits represented by time-dependent (relaxing) reservoirs showed that taking into account the rheological characteristics of the reservoir in the well bottom-hole zone significantly refines the forecasting of the main development indicators. It has been established that when the creep effect of formation rocks in the near-wellbore zone is taken into account, the maximum difference in the current values of formation pressures reaches up to 12.53%. It corresponds to a gas recovery factor value of 0.55.

Keywords

Main Subjects

Computational Methods for Differential Equations
Volume 13, Issue 3
July 2025
Pages 828-838

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History

  • Receive Date: 05 July 2024
  • Revise Date: 09 October 2024
  • Accept Date: 27 October 2024

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