Cooldown of Subsea Deadleg With a Cold Spot: Experimental and Numerical Heat-Transfer Analysis
Experimental and numerical heat-transfer analysis was conducted on a T-shaped acrylic-glass pipe, representing a production header in a subsea production system with a vertical deadleg. The header was insulated, while the deadleg was not insulated and carried a cold spot on the top. The experimental conditions were set to mimic those of steady-state production, followed by a 3-hr shutdown (cooldown). The internal fluid temperature and the wall temperature were measured by use of resistance temperature detectors and thermocouples, respectively, while particle image velocimetry was used to measure the velocities in the deadleg. It was shown that the mean velocity field during both steady state and cooldown was periodic, with a clockwise and counterclockwise rotation along the deadleg wall. By use of a k–ω shear-stress transport Reynolds-averaged Navier-Stokes (RANS) model in ANSYS CFX, the thermal field was correctly predicted for 3 hr of cooldown by modeling the cold spot as an isothermal wall. The RANS model was unable to recreate the periodic velocity field observed in the experiment.
Supply Chain Consortium Launched for Decommissioning Services
Global spending on oil and gas decommissioning is expected to be $13 billion per year by 2040. The launch of a collaborative supply chain approach to global decommissioning offers an end-to-end solution to reduce the decommissioning burden, risk, and cost for operators in Europe, Asia, and Americas.
Catalysts for Offshore Progress: Service Company Partnerships, M&As
Executives from several service companies involved in the offshore space—including two sides of a recent hostile takeover bid—came together at OTC to discuss the virtues of collaboration and rationale behind M&A.
Swarming, Swimming Robots Make Their Debut
Aquabotix’s SwarmDiver technology marks a major milestone in the growing trend toward swarm-deployed underwater vehicles.
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07 May 2018