Sliding sleeves are used to enable selective zonal isolation and can improve water and gas management throughout the life of the well. Because of the large shifting force and extended reach required to operate sliding sleeves in long horizontals, coiled tubing is typically used. Coiled tubing also provides the benefit of pumping fluids to clean out or treat the well. A surface load measurement with coiled tubing may sometimes provide a positive indication of shifting, but not in all cases. Also, surface measurements alone do not provide a way to determine the sleeve position. This paper describes conventional techniques used to confirm proper shifting and determine sleeve position. An improved method is presented, along with yard and field test results.
Substantial improvement in gathering and managing critical data in tracking, readiness, utilization and reliability of downhole tools is required in today's challenging well intervention operations. Critical information must be collected and presented in an effective way in order to make efficient use of that data. Coiled tubing service providers have already achieved successes in the maintenance tracking of surface equipment but not for downhole tools. Whereas running conventional coiled tubing tools ranged from check valves, nozzles, motors and jars, today's coiled tubing tools incorporate advanced electronics, fiber optics and sensors. The intent of the following discussion is to show how the implementation of software, customized for coiled tubing downhole tools, resulted in an improvement in service quality.
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