Thermal Analysis of Sandwich Pipes With Active Electrical Heating

2003 ◽  
Author(s):  
Jian Su ◽  
Djane R. Cerqueira ◽  
Segen F. Estefen
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Oil And Gas ◽  
Gas Production ◽  
Heat Transfer Analysis ◽  
Electrical Heating ◽  
Flow Assurance ◽  
Insulation Material ◽  
Power Requirement ◽  
Pipe System

Sandwich pipes consisting of two concentric metal pipes with insulation material in annulus have been developed to meet challenging mechanical and thermal requirements of deep and ultra deepwater oil and gas production. Passive thermal insulation is designed to meet flow assurance requirements under steady-state production conditions, but is unlikely to meet more severe conditions during transient events such as warm-up and cool-down. In this work, we propose a new sandwhich pipe system with active electrical heating, provided by a number of electrical resistance strips stuck longitudinally over the outer surface of the inner metal pipe. A steady-state heat transfer analysis is carried out to determine the temperature distribution in a cross section of the sandwich pipe, the power requirement of electrical heating, and the overall heat transfer coefficient. It is shown that the sandwich pipe with active heating is a viable solution to meet server flow assurance requirements of ultra deepwater oil production.

Simulation of Transient Heat Transfer of Sandwich Pipes With Active Electrical Heating

2004 ◽  
Author(s):  
Djane R. Cerqueira ◽  
Jian Su ◽  
Segen F. Estefen
Keyword(s):  
Heat Transfer ◽  
Oil And Gas ◽  
Finite Difference Methods ◽  
Computational Simulation ◽  
Gas Production ◽  
Electrical Heating ◽  
Transient Heat Transfer ◽  
Flow Assurance ◽  
Insulation Material ◽  
Production Conditions

Sandwich pipes consisting of two concentric metal pipes with insulation material in the annulus have been developed to meet challenging mechanical and thermal requirements of deep and ultra deepwater oil and gas production. Passive thermal insulation is designed to meet flow assurance requirements under steady-state production conditions, but is unlikely to meet more severe conditions during transient events such as warm-up and cool-down. In this work, we present the analysis of transient heat transfer in the sandwich pipelines with active electrical heating. The mathematical model governing the heat conduction in the composite pipeline and the energy transport in the produced fluid is solved by using finite difference methods. As unplanned cool-down of the pipelines is most critical to safe and economical operation of pipelines in deep and ultra deep water conditions, it is presented here numerical results of computational simulation of cool-down for three sandwich pipeline configurations under typical production conditions. The analyses show that the sandwich pipe with active heating is a viable solution to meet severe flow assurance requirements of ultra deepwater oil production even under unplanned and prolonged cool-down conditions.

scholarly journals The Influence of Burial Depth and Soil Thermal Conductivity on Heat Transfer in Buried CO2 Pipelines for CCS: A Parametric Study

2020 ◽  
Author(s):  
Babafemi Olugunwa ◽  
Julia Race ◽  
Tahsin Tezdogan
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Steady State ◽  
Thermal Resistance ◽  
Parametric Study ◽  
Flow Assurance ◽  
Burial Depth ◽  
Soil Thermal Conductivity ◽  
Dense Phase ◽  
Pipeline Transportation

Abstract Pipeline heat transfer modelling of buried pipelines is integral to the design and operation of onshore pipelines to aid the reduction of flow assurance challenges such as carbon dioxide (CO2) gas hydrate formation during pipeline transportation of dense phase CO2 in carbon capture and storage (CCS) applications. In CO2 pipelines for CCS, there are still challenges and gaps in knowledge in the pipeline transportation of supercritical CO2 due to its unique thermophysical properties as a single, dense phase liquid above its critical point. Although the design and operation of pipelines for bulk fluid transport is well established, the design stage is incomplete without the heat transfer calculations as part of the steady state hydraulic and flow assurance design stages. This paper investigates the steady state heat transfer in a buried onshore dense phase CO2 pipelines analytically using the conduction shape factor and thermal resistance method to evaluate for the heat loss from an uninsulated pipeline. A parametric study that critically analyses the effect of variation in pipeline burial depth and soil thermal conductivity on the heat transfer rate, soil thermal resistance and the overall heat transfer coefficient (OHTC) is investigated. This is done using a one-dimensional heat conduction model at constant temperature of the dense phase CO2 fluid. The results presented show that the influence of soil thermal conductivity and pipeline burial depth on the rate of heat transfer, soil thermal resistance and OHTC is dependent on the average constant ambient temperature in buried dense phase CO2 onshore pipelines. Modelling results show that there are significant effects of the ambient natural convection on the soil temperature distribution which creates a thermal influence region in the soil along the pipeline that cannot be ignored in the steady state modelling and as such should be modelled as a conjugate heat transfer problem during pipeline design.

On Determination of Acceptable Safety Class in Design of Pipe-In-Pipe (PIP) Systems

2014 ◽  
Author(s):  
Soheil Manouchehri ◽  
Guillaume Hardouin ◽  
David Kaye ◽  
Jason Potter
Keyword(s):  
Failure Modes ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Gas Production ◽  
Point Of View ◽  
Insulation Material ◽  
Limit States ◽  
Oil And Gas Production ◽  
Operational Conditions ◽  
Outer Pipe

Pipe-In-Pipe (PIP) systems are increasingly used in subsea oil and gas production where a low Overall Heat Transfer Coefficient (OHTC) is required. A PIP system is primarily composed of an insulated inner pipe which carries the production fluid and an outer pipe that protects the insulation material from the seawater environment. This provides a dry environment within the annulus and therefore allows the use of high quality dry insulation system. In addition, from a safety point of view, it provides additional structural integrity and a protective barrier which safeguards the pipeline from loss of containment to the environment. Genesis has designed a number of PIP systems in accordance with the recognized subsea pipeline design codes including DNV-OS-F101 [1]. In section 13 F100 of the 2013 revision, a short section has been included in which PIP systems are discussed and overall design requirements for such systems are provided. It has also been stated that the inner and outer pipes need to have the same Safety Class (SC) unless it can be documented otherwise. This paper looks at the selection of appropriate SC for the outer pipe in a design of PIP systems based on an assessment of different limit states, associated failure modes and consequences. Firstly, the fundamentals of selecting an acceptable SC for a PIP system are discussed. Then, different limit states and most probable failure modes that might occur under operational conditions are examined (in accordance with the requirements of [1]) and conclusions are presented and discussed. It is concluded that the SC of the outer pipe of a PIP system may be lower than that of the inner pipe, depending on the failure mode and approach adopted by the designer.

A Computational Scheme for Fluid Flow and Heat Transfer Analysis in Porous Media for Recovery of Oil and Gas

2005 ◽  
Vol 23 (7-8) ◽  
pp. 843-862 ◽  
Author(s):  
David M. Scott ◽  
Debendra K. Das ◽  
Vijayagandeeban Subbaihaannadurai ◽  
Vidyadhar A. Kamath
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Fluid Flow ◽  
Oil And Gas ◽  
Computational Scheme ◽  
Heat Transfer Analysis ◽  
Flow And Heat Transfer

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.

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