DRILLING & EXPLORATION
Workstrings International Provides CTM26 Drill Pipe in Record-Breaking GOM Flowline
Cleanout Operation Workstrings International (Workstrings), the leading provider of quality drilling and tubular handling equipment and a Superior Energy Services company, provided the 4 in. CTM26 drill pipe used in a record-breaking 28,789 ft flowline cleanout operation in the Gulf of Mexico.
Workstrings was called upon to supply the CTM26 drill pipe as an alternative to coiled tubing in the multi-phase project to decommission approximately 29,000 ft of 10 in. x 6 in. insulated pipeline in the Gulf of
Mexico. The project, deployed in the Ozona Garden Banks 515 location, set a new offshore snubbing unit/ hydraulic workover world record, onboard the Q4000 vessel.
The project was completed rapidly in 22 days, ahead of incoming Hurricane Laura, and consisted of retrieving and removing a Pipeline End Termination (PLET) to surface of a DP3 drilling intervention vessel. The second objective was to use a 340k snubbing unit to rig up and intervene inside the pipeline with an optimized drill pipe workstring to perform washing/flushing operations until reaching the second PLET. A
cap was then installed on the first end of the pipeline and placed back in the original trench on the seafloor with the deployment rigging and drill string for permanent abandonment in-situ. This decommissioning method was the most cost-effective and environmentally safe.
To date, this is the longest subsea flowline cleanout conducted via this method, with the previous snubbing record depth of 23,800 ft set in 2006 on the Q4000 during the Mariner Energy Pluto pipeline clean out. Workstrings’ drill pipe and engineering string design was used for this operation as well.
CGG Extends Northern Viking Graben
Dual-Azimuth Multi-Client Survey CGG recently announced phase two of its multi-client 3D survey in the Northern North Sea, which will expand on the phase one acquisition initiated in 2020 to add a second azimuth over CGG’s existing Northern Viking Graben (NVG) multi-client 3D survey and extend coverage into the UKCS. The survey is supported by industry pre-funding.
As already confirmed by initial results from the 2020 phase one acquisition, the added azimuth will enable CGG’s advanced proprietary processing to address and improve the imaging of the multi-directional fault patterns prevalent in the region. Improved resolution will help resolve complex and marginal reservoir stratigraphy.
Commencing in early May and continuing throughout the North Sea season, the 2021 phase two acquisition will add approximately 8,000 sq km of new data in an E-W direction. Similar to the 2020 phase one, multi-component technology will be used for the acquisition, and this new data will be processed together with the existing N-S data, using CGG’s latest velocity modeling and imaging technology, to produce a dual-azimuth volume.
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Fast-track data from the phase two acquisition are expected to be available by the end of 2021, and final processed data during the second half of 2022.
Sophie Zurquiyah, CEO, CGG, said: “With phase two of our planned multi- year project, CGG continues to follow its strategic path of expanding and enhancing its data library in mature and prolific hydrocarbon regions. This expansion draws on CGG’s extensive understanding of the Northern Viking Graben and builds on our 44,000 sq km of existing coverage in the Northern
North Sea. Early results from the 2020 phase one acquisition demonstrate that, with CGG’s superior imaging, the new data will further de-risk existing fields and unlock the significant remaining near-field potential.”
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