Computer Aided Pressure Transient Analysis of a Layered Reservoir System with a Constant Pressure Boundary

Year 2020, , 35 - 41, 31.03.2020

Erhuvwuvoke Ebojoh , Elohor Diamond Akpobi

https://doi.org/10.22399/ijcesen.619912

Abstract

A Layered
reservoir system with a constant pressure bottom boundary has immense potential
to produce oil and gas, using horizontal wells may further increase
productivity because it offers a larger surface area for fluid withdrawal. Test
analysis in this system is tedious, time consuming and interpretation may be
confusing or erroneous. Hence an efficient algorithm is needed to generate
accurate pressure response of the wells to facilitate quick and easy analysis
and prediction. This paper presents an interactive computer program that
computes the dimensionless pressure and dimensionless pressure derivatives of
horizontal wells in a two layered reservoir system with a constant pressure
boundary. Program’s codes and structure of the reservoir model solution were
written utilising the exponential integral solution, Gauss Laguerre and Gauss
Lagrange numerical methods. The program has features that gave visual
interpretation (graphical user interfaces (GUI)) as it computes pressure and
derivative values when the interface between the layers is either permeable (crossflow
reservoir) or impermeable (no crossflow reservoir). Examples illustrating its
use in model identification and well test analysis of layered system with
constant pressure boundary are also included in this work. Hence it will serve
as a good learning tool because it is user friendly, fast and results have
acceptable level of accuracy.

Keywords

layered reservoir, horizontal well, object oriented programming, dimensionless pressure, dimensionless pressure derivative.

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