The job design required setting a bottom packer in a pup joint below the leaking port and a top packer in a solid joint above. Given the temperature, tubing size, and estimated buckling and stretch, the use of memory correlation and flagging pipe for depth cor-relation would not have been accurate enough for tubing patch placement. The DepthLOG* service provided real-time depth correlation to accurately place the tubing patch within an 8-ft window. The overall bot-tomhole assembly (BHA) length extended 45 ft, and the borehole deviated 88º in the setting window.

Unlike other conventional casing collar locator (CCL) systems, the DepthLOG service does not require data cable. Communication takes place via pressure telemetry signals, and a real-time CCL log is available at surface. Because balls and fluid are allowed to pass through the tool, a standard ball-operated firing head can be used. Using the real-time data on the surface CCL log, specialists were able to correlate depth with the baseline log, accurately position the BHA, and set thepackers on depth.

A subsequent log, along with 1,300-BOPD production, verified the succes