In an ongoing attempt to learn more about subsurfaceconditions before and during production, servicecompanies and operators have explored a wide range oftechnologies. One technology, that allows fortransmission of subsurface data back to the surface, is theinstallment of fiber optic cable behind casing. Fiber opticcable not only provides subsurface data conditionsaffecting production, but it serves as a highway for datatransmission in seismic surveys, as well as, monitoringproduction information itself along the entire length ofthe cable. We will expand on methods used to preservethis installment of the fiber optic cable by identifying itslocation behind casing.Circumferential ultrasonic scanning techniques havebeen used for many years to inspect the casing itself, andcement behind the first string of casing. Thesetechniques offer a better inspection of channeling, orpartial vertical void in cement behind first string ofcasing, than just your standard radial cement bond tool.Cement and Casing Inspection have been useful servicesof the ultrasonic scanning services, but it isn’t withoutlimitations, whereas this scanning tool has a shallowdepth of investigation. Traditionally, standard cementbond logs are used in conjunction with thecircumferential ultrasonic scanning services to examinethe bond index, and to offer some additionalunderstanding of the cement bond to casing, as well ascement to formation bond. In that shallow ultrasonicscan, is where this publication will demonstrate the valueadded of locating the fiber optic cable, but it is notwithout some uncertainty.To reduce some of that uncertainty, a pulsed-eddycurrent system, which uses an arm-mounted pad sensorthat contacts the inside of the first casing string, utilizespulsed-eddy current technology to accurately locate theposition of the fiber optic cable mounting clamps.Detecting the location of the clamps, offers great insightinto oriented perforation, but as this publication willdemonstrate, the fiber optic cable can meander inbetween those clamps. The circumferential ultrasonicscanning service offers visibility of the meandering ofthat fiber optic cable, in between clamps, and when usedin combination with the pulsed-eddy current system, thiscreates an integrated service that reduces the probabilityof perforating the installment of the fiber optic cable.Purpose of this paper, will be, to demonstrate the use ofthe impedance data, gained from the circumferentialultrasonic scanning tool, in combination with the fiberoptic clamp location from the pulsed-eddy current tool,to locate the fiber optic flatpack between clamplocations. However, there are limitations in the locationof the fiber flatpack, as in, gaps between flatpack andcasing, and/or lack of cement coverage. The finalproduct will include the depth location of clamps, stationdegrees of fiber loop, degrees of fiber flatpack location,and level of confidence by interval shading. Thisinformation will give customers greater confidence inthe execution of oriented perforation procedures, withoutdamaging fiber optic cable flatpack.
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