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SPE-188972-MS Accurately Locating Casing Collars in Real Time with Drill Pipe Deployed Gamma Ray Density Measurement Abstract
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US9598954B1 - Dual-mode casing collar locator (CCL) tool, mode selection circuit and method - Google Patents
Oil Industry Training - Casing Collar: The threaded collar used to connect two joints of casing. The resulting connection must provide adequate mechanical strength to enable the casing string to be run
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