This paper describes how a commonly encountered problem with logging deep, hot holes throughout the United States was overcome through the cooperation of a major oil company, service company, and national laboratory. First, we review the past, unreliable performance of standard industry tools during long logging runs at high bottom hole temperatures through actual field examples. Next, we discuss the innovative tool redesign that keeps the inside of the tool cool without increasing the outside diameter of the tool. Finally, we present a comparison of the hot hole and standard tool operating performance in both the laboratory and numerous field examples.

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