Transient temperature behavior and analysis of single-phase liquid-water geothermal reservoirs during drawdown and buildup tests: Part II. Interpretation and analysis methodology with applications

Mustafa Onur, Yildiray Palabiyik*, O. Inanc Tureyen, Murat Cinar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

In this work, we present new semi-log straight line and temperature-derivative methods for interpreting and analyzing temperature transient data acquired during drawdown and buildup tests in an infinite acting homogeneous, single-phase liquid-water geothermal reservoirs. The methods are based on the analytical solutions derived in our accompanied paper (Part I) accounting for the effects of Joule-Thomson (J-T) heating/cooling, transient adiabatic fluid expansion/compression, convection, and conduction. Drawdown and buildup sand-face temperature data are shown to exhibit three infinite-acting radial flow (IARF) periods; early-time IARF reflecting the adiabatic expansion/compression effects in the skin zone if it exists, intermediate-time IARF reflecting the J-T effects in the skin zone, and late-time IARF reflecting the J-T effect in the non-skin zone. Semi-log straight-line analyses based on the identified proper IARF regimes and their time intervals on a log-log diagnostic plot of the absolute value of temperature-derivative vs. elapsed time, jointly with conventional pressure transient analysis (PTA), provide estimates of porosity, J-T coefficient of fluid, mobility of skin and non-skin zones as well as radius of the skin zone, which are not readily accessible from PTA alone. The applicability of the proposed analysis methods is demonstrated by considering two synthetic test examples and one field test data set.

Original languageEnglish
Pages (from-to)657-669
Number of pages13
JournalJournal of Petroleum Science and Engineering
Volume146
DOIs
Publication statusPublished - 1 Oct 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

Funding

This research work has been done under the auspices of Istanbul Technical University (ITU) Geothermal Research Group dedicated to fundamental and applied research on geothermal engineering problems. The in-house simulator has been developed with funding provided from the Scientific and Technological Research Council of Turkey (TUBITAK) under the project number 110M482 as a part of the PhD thesis of the second author. The first author also thanks Dr. Jeff App of Chevron for reading the manuscript and providing useful comments and suggestions. We also thank TUBITAK, ITU , and ITU Petroleum and Natural Gas Engineering Department for providing financial support for conducting this study.

FundersFunder number
ITU Petroleum and Natural Gas Engineering Department
TUBITAK110M482
International Technological University
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

    Keywords

    • Adiabatic expansion/compression
    • Derivative and semi-log straight line methods
    • Drawdown and buildup transient temperature data
    • Joule-Thomson heating or cooling
    • Liquid-water geothermal reservoirs
    • Parameter estimation

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