What is the side-entry sub (CSES)?
The conical side-entry sub (CSES) was designed to overcome the largest recurring problem experienced in the ODP logging program – poor hole conditions due to bridging from swelling clays, hole spalling, or similar problems. The CSES allows the drillpipe to be safely lowered through bridges, as well as cool fluids to be circulated while logging; this can increase logging success rate to nearly 100% in difficult borehole environments. The CSES attaches to the drill pipe to allow the cable to be run outside the pipe. The sub is installed with the open end of the pipe above the top of the interval to be logged, and tools are then run into the hole as usual with the cable passing through the CSES. The pipe is run back to total depth. Open hole logs are recorded as pipe is simultaneously pulled back up and hole is exposed.
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