The PBL® Multiple Activation circulating sub was requested by an operator to be utilized in the 12-1/4” hole section in a deep-water operation offshore Malaysia. The 8-1/4” PBL tool was placed above the BHA to cure major mud losses, which allowed pumping LCM and thixotropic cement whenever needed without the need to pull out the BHA.
The PBL® Multiple Activation circulating sub was requested by an operator to be utilized in the 12-1/4” hole section in a deep-water operation offshore Malaysia. The 8-1/4” PBL tool was placed above the BHA to cure major mud losses, which allowed pumping LCM and thixotropic cement whenever needed without the need to pull out the BHA.
Execution
While drilling at 4,880 m depth, severe losses were encountered, the PBL tool was activated, and LCM pills were pumped and the PBL was deactivated with no issues. However, the mud losses continued at an unacceptable rate of 60 bbl/hr. The decision was made to activate the PBL tool for a second time and the cement slurry was pumped through the PBL’s open ports. 120 bbl of cement slurry 16 ppg followed by oil-based mud were displaced.
The well was monitored, and as the losses remained at a higher level than permitted, a second batch of cement slurry was displaced, and mud losses were finally eliminated. The PBL tool was successfully deactivated and the flow through the BHA was re-stablished allowing the operator to drill the section to the total depth (TD) with no additional issues.
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