HPHT Wells Create New Challenges Demanding Higher Levels of Coiled Tubing Inspection and Management

摘要

The coiled tubing (CT) industry continues to operate in deeperand higher-pressure wells.1 Under these demanding serviceconditions, performance and reliability of the tubing areessential. This paper discusses field service and other eventsthat led to an aggressive plan to introduce new inspectiontechniques that will help assure a higher level of performanceof coiled tubing strings. The enhanced inspection techniquesbeing instituted include inspection by the tubing manufacturerof the incoming strip and continuous phased-array ultrasonicinspection of the seam weld. In addition, the traditionalthrough-hole calibration standards were upgraded with morerealistic discontinuities to help ensure that the produced tubingis defect-free. The paper also discusses the importantrequirements of string management and maintenanceprocedures. A key to the success of this ongoing program hasbeen the synergistic activity between the service company andthe tubing manufacturer.