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Title: Radial Differential Temperature Rdt() Logging- A New Tool For Detecting And Treating Flow Behind Casing
Author: Claude E. Cooke Jr.
Source: American Gas Association 1980
Year Published: 1980
Abstract: Primary cementing of casing in wells to achieve a pressure seal between strata (zone isolation) is a critical step in well completions. It is also important to seal casing seats during the drilling process and lo achieve a seal ai liner tops. Unfortunately, sometimes a seal is inadequate, although numerous steps are taken to place cement effectively. Determining whether the annular space behind pipe is sealed by cement is difficult in some circumstances. The critical question is whether flow is occurring along the wellbore behind pipe under existing conditions in the wellbore. Flow must be detected through the steel casing, plus as much as 2 or 3 in. (5 or 8 cm) of cement. Several logging methods can delect this flow, including measuring the fluid temperatures inside casing, radiotracer injection, and noise detection.

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