Thermal effects on single-well chemical-tracer tests for measuring residual oil saturation

Y. J. Park, H. A. Deans, Tayfun E. Tezduyar

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The single-well chemical-tracer (SWCT) test for measuring residual oil saturation, S or, often involves injecting cool fluid containing a reactive tracer into a warm formation. The S or estimation with this method depends on the separation between reactant and product tracers. Because the reaction rate is temperature-dependent, accounting for the thermal effects may be necessary to obtain reliable results. Two simulator models are normally used to interpret SWCT tests. The ideal model is used for relatively homogeneous sandstone formations. The pore-diffusion model is used for heterogeneous carbonate formations. Both models have now been solved with appropriate heat-balance equations. These nonisothermal models have been used to reinterpret several previously reported field tests. For the worst case, the estimated S or value from the nonisothermal model is 5% PV higher than that from the isothermal model. Inequality conditions have been developed that divide the parameter space of SWCT tests into two regions, depending on the location of the temperature front relative to the tracer bank during the reaction period. In the 'safe' region, the estimated S or values from isothermal and nonisothermal models are essentially equal. The inequality conditions have been extended to include the effects of over-and underburden layers and intervening shales in layered systems.

Original languageEnglish
Pages (from-to)401-408
Number of pages8
JournalSPE Formation Evaluation
Volume6
Issue number3
Publication statusPublished - 1991 Sep
Externally publishedYes

Fingerprint

Thermal effects
Oils
Carbonates
Sandstone
Reaction rates
Simulators
Temperature
Fluids

ASJC Scopus subject areas

  • Process Chemistry and Technology

Cite this

Thermal effects on single-well chemical-tracer tests for measuring residual oil saturation. / Park, Y. J.; Deans, H. A.; Tezduyar, Tayfun E.

In: SPE Formation Evaluation, Vol. 6, No. 3, 09.1991, p. 401-408.

Research output: Contribution to journalArticle

@article{efbadff3b7f14bbb861f088dec8a336d,
title = "Thermal effects on single-well chemical-tracer tests for measuring residual oil saturation",
abstract = "The single-well chemical-tracer (SWCT) test for measuring residual oil saturation, S or, often involves injecting cool fluid containing a reactive tracer into a warm formation. The S or estimation with this method depends on the separation between reactant and product tracers. Because the reaction rate is temperature-dependent, accounting for the thermal effects may be necessary to obtain reliable results. Two simulator models are normally used to interpret SWCT tests. The ideal model is used for relatively homogeneous sandstone formations. The pore-diffusion model is used for heterogeneous carbonate formations. Both models have now been solved with appropriate heat-balance equations. These nonisothermal models have been used to reinterpret several previously reported field tests. For the worst case, the estimated S or value from the nonisothermal model is 5{\%} PV higher than that from the isothermal model. Inequality conditions have been developed that divide the parameter space of SWCT tests into two regions, depending on the location of the temperature front relative to the tracer bank during the reaction period. In the 'safe' region, the estimated S or values from isothermal and nonisothermal models are essentially equal. The inequality conditions have been extended to include the effects of over-and underburden layers and intervening shales in layered systems.",
author = "Park, {Y. J.} and Deans, {H. A.} and Tezduyar, {Tayfun E.}",
year = "1991",
month = "9",
language = "English",
volume = "6",
pages = "401--408",
journal = "SPE Formation Evaluation",
issn = "0885-923X",
publisher = "Society of Petroleum Engineers (SPE)",
number = "3",

}

TY - JOUR

T1 - Thermal effects on single-well chemical-tracer tests for measuring residual oil saturation

AU - Park, Y. J.

AU - Deans, H. A.

AU - Tezduyar, Tayfun E.

PY - 1991/9

Y1 - 1991/9

N2 - The single-well chemical-tracer (SWCT) test for measuring residual oil saturation, S or, often involves injecting cool fluid containing a reactive tracer into a warm formation. The S or estimation with this method depends on the separation between reactant and product tracers. Because the reaction rate is temperature-dependent, accounting for the thermal effects may be necessary to obtain reliable results. Two simulator models are normally used to interpret SWCT tests. The ideal model is used for relatively homogeneous sandstone formations. The pore-diffusion model is used for heterogeneous carbonate formations. Both models have now been solved with appropriate heat-balance equations. These nonisothermal models have been used to reinterpret several previously reported field tests. For the worst case, the estimated S or value from the nonisothermal model is 5% PV higher than that from the isothermal model. Inequality conditions have been developed that divide the parameter space of SWCT tests into two regions, depending on the location of the temperature front relative to the tracer bank during the reaction period. In the 'safe' region, the estimated S or values from isothermal and nonisothermal models are essentially equal. The inequality conditions have been extended to include the effects of over-and underburden layers and intervening shales in layered systems.

AB - The single-well chemical-tracer (SWCT) test for measuring residual oil saturation, S or, often involves injecting cool fluid containing a reactive tracer into a warm formation. The S or estimation with this method depends on the separation between reactant and product tracers. Because the reaction rate is temperature-dependent, accounting for the thermal effects may be necessary to obtain reliable results. Two simulator models are normally used to interpret SWCT tests. The ideal model is used for relatively homogeneous sandstone formations. The pore-diffusion model is used for heterogeneous carbonate formations. Both models have now been solved with appropriate heat-balance equations. These nonisothermal models have been used to reinterpret several previously reported field tests. For the worst case, the estimated S or value from the nonisothermal model is 5% PV higher than that from the isothermal model. Inequality conditions have been developed that divide the parameter space of SWCT tests into two regions, depending on the location of the temperature front relative to the tracer bank during the reaction period. In the 'safe' region, the estimated S or values from isothermal and nonisothermal models are essentially equal. The inequality conditions have been extended to include the effects of over-and underburden layers and intervening shales in layered systems.

UR - http://www.scopus.com/inward/record.url?scp=0026221889&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026221889&partnerID=8YFLogxK

M3 - Article

VL - 6

SP - 401

EP - 408

JO - SPE Formation Evaluation

JF - SPE Formation Evaluation

SN - 0885-923X

IS - 3

ER -