Published June - July 2025, Pg. 37-41
Section: Oil and gas preparing and transportation
UOT: 621.01:66.073
DOI: 10.37474/0365-8554/2025-06-07-37-41
The study of sedimentation processes in low-pressure vertical pipes
G.G. Ismayılov Dr. in Tech. Sc. - Azerbaijan State University Oil and IndustryThe operational experience of offshore fields shows that during the collection and transportation of multiphase well products, various sedimentation processes frequently occur in subsea pipelines and their vertical pipe components. These processes depend on the structural form of the flow and the presence of phases such as sand, clay, water, gas, and condensate, leading to blockages. Such processes are more common in low-pressure multiphase pipelines.
The fact that offshore fields are located far from the coast in deep water basins creates significant operational challenges. Research has revealed that when transporting low-pressure gas between offshore platforms, mechanical mixtures and liquids separate from the gas and accumulate in the section of the pipeline rising from the seabed (vertical pipe). This leads to serious obstructions to gas movement and results in increased pressure in pipelines carrying low-pressure gas. The low-pressure gas, along with liquid and mechanical mixtures, enters the compressor station with pulsations, causing accelerated wear and damage to expensive compressor machinery components.
Considering the above, the article first examines the forces acting on liquid and solid particles in a vertical pipe based on the D’Alembert principle. This principle significantly simplifies motion equations, representing them as equilibrium equations, incorporating inertial forces into the system.
At the point where the low-pressure subsea gas pipeline rises to the platform along an R-radius arc, the forces acting on liquid and solid particles (such as sand) are primarily gravity, Archimedean force, and resistance forces. The equilibrium conditions of these forces are analyzed based on the D’Alembert principle. The article generalizes sedimentation processes in flows containing dispersed media (gas, liquid) and dispersed phases (sand, water), demonstrating the feasibility of assessing sedimentation rates and identifying key influencing factors.
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