MORE COLLAPSE TESTS ADD TO COILED TUBING APPLICATIONS

Eric J. Walker BP Exploration (Alaska) Inc. Anchorage Doug Costall Canadian Fracmaster Ltd. Anchorage The collapse limits of thicker-walled coiled tubing have been determined to ensure safe and successful workover operations. Prudhoe Bay has been using 1.75-in. OD coiled tubing for 2 years. When BP Exploration (Alaska) Inc. initially started using this larger size coil, collapse tests were run on 0.109-in. wall thickness coil.' These tests provided a base curve by which much work has been

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