西南石油大学学报(自然科学版)

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The Solution of Composite Reservoir Model Based on Bessel Function of#br# Imaginary Argument SN Algorithm

LI Tiejun*, TONG Liyuan, GUO Dali, CUI Linpeng, YANG Wujian   

  1. Faculty of Science,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2016-06-01 Published:2016-06-01

Abstract:

Analytical solution of composite reservoir model which considers wellbore storage and skin effect is complex in
its form and curve shocks occur in the conventional numerical solving process. Therefore,it is necessary to make researches
on accuracy of numerical solution. Firstly,the real space solution is obtained by using the stehfest numerical inversion to the
analytical solution of Laplace space dimensionless pressure. After that,by analyzing the form of the solution,we determine the
solving of the Bessel function of imaginary argument is the key to numerical solution of the model. Then we present sectional
numerical(SN)algorithm of Bessel function of imaginary argument whose calculation accuracy of results can be comparable to
the Matlab. The curves of the infinite,constant pressure and closed outer boundary conditions obtained by the above algorithm
are smooth and complete. What′s more,the program runs fast enough to well satisfy the requirements of well test analysis and
is suitable for composite reservoir well testing analysis.

Key words: curve shocks, stehfest numerical inversion, sectional numerical algorithm, Bessel function of imaginary argument,
smooth and complete

CLC Number: