A Quantitative Technique for Determining Injectivity Profiles Using Radioactive Tracers

Wiley, Ralph; Cocanower, R.D.

doi:10.2523/5513-ms

Cited by 1 publication

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“…If the velocity 512 calculated is the average velocity, the volumetric flow rate is given by (2) At where A is the cross-sectional area between the logging sonde and the pipe wall, LlL is the detector spacing, and At is the measured transit time. Often, the transit time measured from a velocity shot log is the time between the arrival of the leading edge of the tracer slug at the detectors.…”

Section: Velocity Shot Methodmentioning

confidence: 99%

“…In this paper, we will not consider errors caused by the gamma ray measurement itself, though these can be significant, as shown by Wiley and Cocanower. 2 The primary drawback to the tracer loss method is its limited depth resolution. As Lichtenberger 1 demonstrates, the tracer loss analysis tends to "smear" locations of fluid exit over larger distances than actually may be occurring because the tracer slug moves a significant distance between measurement locations because of physical constraints and because the measured slug is often opposite zones of fluid loss.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Analysis Methods for Radioactive Tracer Injection Logging

Hill¹,

Solares²

1985

Journal of Petroleum Technology

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Radioactive tracer logging has been used for many years to measure injection profiles. In this study, we analyzed the tracer loss and velocity shot methods of radioactive tracer logging to develop guidelines for improved interpretation of these logs. In addition, tracer logging was simulated experimentally in a test pipeline to check assumptions made in the theoretical analysis. Among the conclusions drawn were that the tracer loss method is imprecise because of poor depth resolution and nonuniform mixing of tracer and that the velocity shot method is subject to significant error when fluid is exiting between detector locations. Finally, a new radioactive tracer logging method is proposed that may offer some advantages over current practices.

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Section: Velocity Shot Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%