Thermal Analysis of Combined Active Heating and Passive Insulation of Deepwater Pipelines

2002 ◽  
Author(s):  
Jian Su ◽  
Clarissa R. Regis ◽  
Adriana Botto
Keyword(s):  
Oil And Gas ◽  
Gas Production ◽  
Hot Water ◽  
Temperature Profiles ◽  
Power Requirement ◽  
Oil And Gas Production ◽  
Heating Method ◽  
Insulation Systems ◽  
Balance Analysis ◽  
Close Form

In this paper, we first present a global heat balance analysis of typical deepwater pipelines for oil and gas production and show that active heating is necessary for long pipelines due to technical limitations of passive thermal insulation systems. Two methods of combined active heating mid passive insulation are then considered. By the first method, active heating is provided by circulating hot water in annulus. Under certain simplifying hypothesis, we provide a close form analytical solution for the temperature profiles of the produced fluid and heat medium. By the second method, active heating is provided by electrical resistance on the inner steel pipe. For this case, we propose a heating method that minimises the power requirement for a given minimum temperature of produced fluid. Numerical results are shown for the second heating method. Significant reduction in power requirement is achieved.

Qualification and Assessment of Subsea Insulation Systems

2013 ◽  
Author(s):  
Alejandro D. Tello
Keyword(s):  
Oil And Gas ◽  
Production Systems ◽  
Hydrate Formation ◽  
Gas Production ◽  
Basic Material ◽  
Wax Deposition ◽  
Insulation System ◽  
Oil And Gas Production ◽  
Insulation Systems ◽  
Performance Challenges

As offshore oil and gas production continues to push into deeper waters, subsea production systems are challenged to manage the inherently higher operating temperatures and pressures. As a consequence of their direct exposure to seawater, subsea “wet” insulation systems on subsea trees, manifolds, and jumpers are amongst the most affected by this progression. Due to the significant thermal gradient between the production stream and subsea environment, subsea insulation systems are constantly trying to inhibit the natural heat transfer. In an effort preserve the operational integrity of the production system, the subsea insulation system maintains the production stream temperature above the hydrate formation and wax deposition temperatures. Thus, any failures such as cracks, disbondment, or hydrolysis, substantially influence the subsea system’s operational philosophy. As a result of ExxonMobil’s observed performance challenges with wet insulation systems, a thorough qualification program was initiated in 2007 to validate the performance of a wet insulation system under simulated service conditions. The qualification consisted of 3 test phases, including basic material property tests, simulated service tests, and an extended service test, for multiple insulation systems. This paper presents an overview of select subsea insulation failures, the qualification program, and subsequent assessment of key material properties, such as tensile strength/elongation, density, and hardness.

Colorado areas of oil and gas production

1994 ◽  
Author(s):  
Richard F. Mast ◽  
D.H. Root ◽  
L.P. Williams ◽  
W.R. Beeman
Keyword(s):  
Oil And Gas ◽  
Gas Production ◽  
Oil And Gas Production

SANICRO 41

Alloy Digest ◽  
1995 ◽  
Vol 44 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Oil And Gas ◽  
High Strength ◽  
Heat Treating ◽  
Gas Production ◽  
Oil And Gas Production ◽  
Corrosion Resistant ◽  
Corrosion Resistant Alloy ◽  
Nickel Base

Abstract SANDVIK SANICRO 41 is a nickel-base corrosion resistant alloy with a composition balanced to resist both oxidizing and reducing environments. A high-strength version (110) is available for oil and gas production. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-475. Producer or source: Sandvik.

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