Analysis of Wireline Interval Pressure Transient Tests From Single and Layered Reservoir Systems

This project examines the methodology of the packer-probe wireline formation tests
(WFT) to interpret and analyse the pressure transient data acquired at the packer and
probes along the wellbore for single layer and multi-layered systems. Such tests are
often called WFT interval pressure transient tests or simply WFT IPTTs. IPTTs offer
some advantages over the conventional (extended) well tests in terms of cost, time,
and providing important properties such as horizontal and vertical permeability over a
scale larger than cores but smaller than that of extended well tests. In this project, the
same methodology applied to a packer-probe WFT in single layer system will be
applied to various multi-layered systems to investigate the feasibility and validity of
using the single-layer analysis methodology for the WFT IPTTs conducted in multilayered
systems. A number of papers were presented on interpretation of packerprobe
transient test because it is important to know the horizontal and vertical
permeability along a wellbore for the benefits of secondary recovery and enhanced oil
recovery purposes. However, most papers available in the literature present analysis
methods for interpreting pressure transient test data acquired by packer-probe WFTs
in single-layer systems. Only a few of them considered interpretation of packer-probe
interval pressure-transient tests in multi-layered systems. Thus, one of the main
objectives in this project is in detail to access the methodology used for analyzing a
single layer system and apply the same to multi-layered system. Various averaging
formulas of horizontal and vertical permeabilities will be used to represent the multilayered
system. The validity of the representation is tested through pressure response
matching. The methodology will be thoroughly discussed in this project. The
interpretation is to conduct in step by step manners by covering the main steps of
pressure transient interpretation and analysis; i.e., flow regime identification,
parameters estimation, averaging permeability as well as pressure response matching.