Prediction of the thermal conductivity of petroleum products

Jamieson, D. T.; Irving, J. B.; Tudhope, J.S.

doi:10.1016/0043-1648(75)90225-2

Cited by 13 publications

(6 citation statements)

References 3 publications

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“…It is likely that the liquid trapped within the deposit may produce convective effects, which would yield a higher value of the apparent thermal conductivity. The predicted thermal conductivity values in Table are in agreement with the values for wax deposits reported in the literature. ,, …”

Section: Results and Discussion: Mass Of The Deposit Layersupporting

confidence: 88%

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Solids Deposition from Multicomponent Wax−Solvent Mixtures in a Benchscale Flow-Loop Apparatus with Heat Transfer

2005

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The deposition of solids from mixtures of a paraffinic wax (C20−C40) dissolved in a multicomponent solvent (C9−C16) was studied under laminar flow conditions. A novel benchscale flow loop was developed, which consisted of a jacketed heat-exchange section for solids deposition on the inner surface of an aluminum tube. Experiments were performed to investigate the effects of the wax−solvent mixture composition, hot and cold stream temperatures, flow or shear rate, deposition residence time, and hydrodynamic entry length on the deposition process. The data were analyzed with a pseudo-steady-state heat-transfer model, which validated the solids deposition process to be controlled primarily by heat transfer. The mass of deposited solids was related to the ratio of temperature difference across the deposit layer and the overall temperature difference. Gas chromatography (GC) analyses of the deposited layer showed significant shifts in the carbon number distribution. The C20+ content of the deposit layer was observed to be higher, by ∼70%−200%, than that of the corresponding wax−solvent mixture.

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Section: Results and Discussion: Mass Of The Deposit Layersupporting

confidence: 88%

“…The thermal conductivity of the deposited solids is also an important property, because the deposition of waxes in flowing crude oil is a thermally driven process. The thermal conductivity values for paraffins reported in the literature are in the range of 0.10−0.35 W m -1 K -1 . − …”

Section: Introductionmentioning

confidence: 99%

Solids Deposition from Multicomponent Wax−Solvent Mixtures in a Benchscale Flow-Loop Apparatus with Heat Transfer

2005

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“…This approach was validated recently with measurements under laminar flow of Norpar13-wax mixtures in a laboratory flow−loop apparatus . As shown by eq 1, parameter θ d at steady state is also equal to the ratio of the thermal resistance offered by the deposit layer and the sum of all thermal resistances: 21,22 For the modeling of solids deposition from paraffinic mixtures as a thermally driven process, the deposit thermal conductivity is an important property, whose reported values range over 0.10−0.35 W/m·K. ,,− …”

Section: Introductionmentioning

confidence: 94%

Modeling of Deposit Formation from “Waxy” Mixtures via Moving Boundary Formulation: Radial Heat Transfer under Static and Laminar Flow Conditions

Bhat

Mehrotra

2005

Ind. Eng. Chem. Res.

134

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A mathematical formulation, based on heat transfer considerations, is presented for solids deposition from “waxy” or paraffinic mixtures. The proposed unsteady-state model uses the moving boundary problem approach for investigating the deposit-layer growth in a circular pipe from binary eutectic mixtures of n-C16H34 and n-C28H58. The model equations were solved numerically to explore the deposition behavior and the growth of deposit layer with time in the radial direction under both static and laminar flow conditions. The deposit-layer growth was predicted to be dependent on the rate of heat transfer at the liquid−deposit interface as well as in the liquid and deposit regions. For cooling under static conditions, complete pipe gelling was predicted to be faster for relatively lower values of mixture temperature, pipe-wall temperature, concentration of C28 in the mixture, and pipe diameter. For cooling under laminar flow conditions, higher values of mixture temperature, pipe-wall temperature and/or heat transfer coefficient yielded a thinner deposit layer with a faster approach to thermal steady state.

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“…For water, the average experimental k is 0.383 Btu/hr-ft-OF (100-240°F) while for diesel, average k is 0.0827 Btu/hrft-OF (l00-200°F). In comparison, the average thermal conductivity coefficient published for water is 0.385 Btu/hr-ft-OF (16) and 0.0834 Btu/hr-ft-OF for diesel (18)(19)(20) over the temperature ranges indicated above. IN GEOTHERMAL AND OIL-RECOVERY APPLICATIONS SPE 11791…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Gelatinous Oil-Base Fluids as Insulators in Geothermal and Oil-Recovery Applications

Son¹,

Dzialowski²,

Loftin³

1983

SPE Oilfield and Geothermal Chemistry Symposium

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The use of a thixotropic gelatinous oil-base fluid as an insulating medium in different oil field applications has become increasingly important. Its economic advantage over tubing/casing insulators makes it very attractive. It has proven itself as a successful thermal insulator in the field, particularly in steam injection projects. The data generated in the field, related to its thermal characteristics, are difficult to correlate because so many variables exist from well to well. This investigation was undertaken to define some properties, under more controlled conditions, that would promote more efficient utilization of the thixotropic gel. Heat transfer coefficients were generated so that its efficiency as an insulator can be rated relative to other insulators. Thermal expansion coefficients, derived in the study, are much needed in engineering calculations such as volume requirements, tubing/casing strength, etc. Behaviour of the insulating gel at 700°F and 10,000 psi and static gel strength at various temperatures were also determined to answer questions on temperature limitations and pressure requirements for placement and displacement.

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Prediction of the thermal conductivity of petroleum products

Cited by 13 publications

References 3 publications

Solids Deposition from Multicomponent Wax−Solvent Mixtures in a Benchscale Flow-Loop Apparatus with Heat Transfer

Solids Deposition from Multicomponent Wax−Solvent Mixtures in a Benchscale Flow-Loop Apparatus with Heat Transfer

Modeling of Deposit Formation from “Waxy” Mixtures via Moving Boundary Formulation: Radial Heat Transfer under Static and Laminar Flow Conditions

Gelatinous Oil-Base Fluids as Insulators in Geothermal and Oil-Recovery Applications

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