Abstract

Noble Energy, Inc. successfully drilled a deepwater exploration Middle Miocene well in November 2012 and discovered the Big Bend Field, located in the Gulf of Mexico Mississippi Canyon Block 698. As the production liner was being run in the MC 698 No. 1 discovery well, tight hole conditions were encountered near total depth. While pumping the primary cement job, lost returns were observed. Prior to the drilling rig leaving location, a cement bond log was run to evaluate the primary cement job. There was no evidence of cement bond across the main oil-bearing zone or directly above it. This was a concern since there are water sands above the main oil-bearing zone which could compromise future production with behind pipe communication issues, in addition to potentially complicating the completion. Plans were made to pump squeeze cement to remediate the primary cement job. When the rig returned to complete the well, a second cement bond log was run February 2014 and compared to the original cement bond log. The second cement bond log showed a zone of sufficient bonding above the main oil-bearing zone, where no bonding was evident on the previous bond log. There was still no evidence of cement across the main oil-bearing sand. Even though preparations were made to remedial squeeze the primary cement job, the decision was made to not engage in remedial cement operations and to continue with the completion. This paper compares the two cement bond logs and discusses the operational considerations leading to the successful completion of the well and producing a prolific oil well safely with no water production.

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