Single-Gradient Subsea-Mud-Lift-Drilling Technology in Deepwater Gulf of Mexico

Topics: Drilling operations MPD/UBD
Source: SPE 174881
Fig. 1—Subsea mud-lift-drilling-technology modes. BOP=blowout preventer; WD=water depth.

Subsea-mud-lift-drilling (SMD) technology is a form of managed-pressure drilling (MPD). As with other MPD systems, SMD technology offers early detection of influxes (kicks) and minimizes downhole losses to weak subsurface formations. However, significant differences are built into the SMD system. This paper will highlight the benefits of single-gradient SMD (SMD-S) technology, the execution of the most recent deployment, and test results that represent the final steps in moving toward continued MPD operations in the deepwater Gulf of Mexico (GOM).


SMD is a sophisticated subsea MPD technology development and commercialization project that has just completed its fourth offshore deployment. With every deployment, the learnings have been captured and addressed successfully. The most recent deployment in the deepwater GOM has demonstrated that the technology works as designed by successfully accomplishing nearly all test objectives. The confidence is now very high that the industry will see the successful commercial delivery of a drilling technology that offers potential for a more-efficient drilling operation. In addition, this technology will lead ultimately to enhanced production and recovery from deepwater assets. SMD has two operational modes, SMD-S and dual-gradient SMD (SMD-D), as illustrated in Fig. 1 (above).

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 174881, “Successful Testing of Single-Gradient Subsea-Mud-Lift-Drilling Technology in Deepwater Gulf of Mexico,” by Sharifur Rahman, Calvin Holt, David Dowell, Danilo Morales, and Siri Davis, Chevron, prepared for the 2015 SPE Annual Technical Conference and Exhibition, Houston, 28–30 September. The paper has not been peer reviewed.
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Single-Gradient Subsea-Mud-Lift-Drilling Technology in Deepwater Gulf of Mexico

01 February 2016

Volume: 68 | Issue: 2