In the United States, the blow-out preventer (BOP) on a drilling rig has to be pressure tested every two weeks (30 CFR 250.737). In deep-water, pressure testing can take on the order of 24-48 hours and involves placing the BOP into various configurations while analyzing the behavior of the applied pressure. This has a significant impact on cost since the rig isn't drilling during testing. Tests have traditionally been interpreted visually by rig personnel using analog circle charts, paper charts which rotate at a known rate (e.g., 1 revolution every 4 hours). Visual interpretation of circle charts is inherently subjective, potentially varying from person to person as well as by the same person at different times.
To remove the subjectivity of circle chart interpretation while safely reducing test times, Hecate developed GreenLight. a suite of tools for digital pressure testing of the BOP. The GreenLight Suite is offered commercially through a partnership with Offshore Technical Compliance (OTC) and builds on Hecate's pioneering experience with the digital pressure testing of BOPs and OTC's proven track record with offshore compliance. The Suite consists of three fundamental tools
The Suite has been approved for use by the Bureau of Safety and Environmental Enforcement (BSEE) for low and high pressure tests of BOPs since October, 2015 and has been used on 40+ offshore locations (and counting!) since that time. For more information see the article featured in the January 2016 issue of World Oil or click on the links provided below.
Click here to find out more about how the GreenLight Suite of tools fits into the big picture of testing BOPs and how traditional analog testing is different from digital pressure testing.