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Improving Temperature-Logging Accuracy in Steamfloods

A robust reservoir surveillance program is key to managing a steamflooding operation successfully. Time-lapse temperature surveys are a primary data type collected from the observation wells to evaluate reservoir heating and to monitor the steamchest. The objective of this study was to look at factors that can affect a temperature log and steps that can be taken to improve temperature-measurement accuracy. Field data and analytical assessment show that several factors can affect the accuracy of a temperature log, which can subsequently affect interpretation and operational decisions.

Temperature-Logging-Tool Overview

Temperature-logging tools are among the most common used in thermal projects. These tools are accurate, reliable, and relatively inexpensive. Fig. 1 shows a schematic of a typical temperature tool. It includes a casing-collar locator (CCL), a temperature sensor, and tool electronics. Temperature logs can also be obtained in conjunction with data from other logs such as the cement-bond, carbon/oxygen, pulse-neutron, and openhole logs. However, it is recommended that temperature surveys from these tools be used for quantitative analysis because the other logs are recorded normally by first lowering the logging tool to the bottom of the well and then logging up to the surface. These log measurements may also be taken at a higher logging speed. But temperature tools, by comparison, are logged downward, therefore avoiding wellbore-fluid-churning issues. Additionally, depth control is maintained by monitoring tension on the line and by correlating to the CCL.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 191539, “Temperature-Logging Guidelines and Factors That Affect Measurement Accuracy,” by Gede Adnyana (retired, former Chevron), Jyotsna Sharma, SPE, Don Mims, SPE, David Barnes, and Ron Behrens, SPE, Chevron, prepared for the 2018 SPE Annual Technical Conference and Exhibition, Dallas, 24–26. The paper has not been peer reviewed.
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Improving Temperature-Logging Accuracy in Steamfloods

01 September 2019

Volume: 71 | Issue: 9

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