Industry’s First High-Density Preservation Fluid Injected in Multiple Gulf of Mexico Wells

A major independent operator recently deployed the industry’s first high-density equipment preservation and hydrate prevention fluid to four subsea trees in the Gulf of Mexico.


The industry’s first high-density (1.145 SG) equipment preservation and hydrate prevention fluid was recently deployed successfully to four subsea trees by a major independent operator in the Gulf of Mexico. Developed by Houston-based Universal Subsea Inc. (USI), the environmentally friendly fluid was injected into the access bore of four subsea wells in the first field application of this novel product.

USI’s Defender Stasis HD preservation fluid was successfully injected in its first deployment subsea in August 2020 on a relatively shallow well in 1,500 ft. of water using a top fill method. The fluid performed identically to lab testing to effectively displace the seawater from the access bore of the subsea tree above the swab valve. This first use subsea verified the remarkable capability of Stasis HD to sweep seawater from the subsea equipment bore under deepsea conditions just by pouring the high-density fluid into the top of the tree. After a second successful deployment three weeks later, the operator selected the Stasis HD fluid for a deepwater intervention on two high-pressure subsea wells in 4,500 ft. of water. The successful use on these two additional wells for a prominent project completed the field trials of the fluid in preparation for commercial release.

The Defender Stasis HD fluid was formulated to stop degradation and preserve sealing integrity of subsea tree mandrels, tree access bores, tubing head spools and similar subsea equipment while preventing costly methane hydrate blockages in the access bore of trees where gas may accumulate. The fluid has unique properties to protect subsea equipment from corrosion, calcareous deposits and marine fouling while preventing methane hydrates.

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