A Two-Parameter Model for Water-Lubricated Pipeline Transportation of Unconventional Crudes
Abstract
:1. Introduction
- (1)
- core annular flow (CAF);
- (2)
- self-lubricated flow (SLF); and
- (3)
- water-assisted flow (WAF).
- single-fluid models;
- and two-fluid models.
2. Materials and Methods
2.1. Experimental Data
2.2. Modeling Approach
2.2.1. Phenomenological Analysis
- separation of the oil-rich core from the pipe wall by a thin water annulus;
- high viscosity and, therefore, negligible shear in the core;
- laminar or plug flow condition of the core;
- turbulent water annulus subjected to high shear;
- sporadic contacts between the wavy oil core and the pipe wall, thus forming a durable oil film on the pipe wall known as wall-fouling;
- entrapment of the turbulent water annulus between the stationary wall-fouling layer and the high-speed oil core; and
- turbulent water annulus resulting in an unusual roughness on the wall-fouling layer that further intensifies the shear in the annulus.
2.2.2. Data Regression
3. Results
3.1. Regression Output
3.2. Model Output
4. Discussion
4.1. Performance of Existing Models
4.1.1. Arney et al.’s Model
4.1.2. Joseph et al.’s Model
4.1.3. Rodriguez et al.’s Model
4.1.4. McKibben et al.’s Model
4.1.5. Shi et al.’s Model
4.2. Classification of the Existing Models
4.2.1. Non-WAF Models
4.2.2. Water-Assisted Flow Models
4.3. Performance of the Current Model
4.4. Statistical Analysis
4.4.1. Coefficient of Determination
4.4.2. Root Mean Square Error
4.4.3. Average Absolute Relative Deviation
5. Conclusions
- (1)
- Two separate sets of pressure gradient data were collected from the literature. Stainless steel and PVC pipelines were used to generate the data. The experimental pipe sizes varied within a broad range of 25 mm to 265 mm. The oil viscosity and the water fraction were also changed over wide ranges of 1.22–26.5 Pa.s and 0.1–0.79, respectively.
- (2)
- The proposed model could be implemented for the SS and PVC datasets. It provided satisfactory predictions for both datasets, which proves its robustness and adaptability. The model estimates were within ±25% of the experimental measurements.
- (3)
- The R2 was significantly higher, while the RMSE and the AARD were considerably lower for the current model compared to other models.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Symbols and Notations
Pressure gradient or frictional pressure loss (kPa/m) | |
f | Fanning friction factor for water lubricated flow (-) |
Density of Arney et al. model specific hypothetical fluid (kg/m3) | |
V | Average velocity (m/s) |
U | Superficial velocity (m/s) |
Uo | Oil superficial velocity (m/s) |
Uw | Water superficial velocity (m/s) |
D | Internal diameter of the pipe (m) |
Re | Reynolds number (-) |
Rea | Arney et al. model specific equivalent Reynolds number (-) |
Rew | Water equivalent Reynolds number (-) |
Water viscosity (mPa·s) | |
Hw | Water hold-up (-) |
Ho | Oil hold-up (-) |
ρw | Water density (kg/m3) |
ρo | Oil density (kg/m3) |
Cw | Input water fraction (-) |
s | Slip ratio (-) |
n | Constant (-) |
b | Constant (-) |
k | Constant (-) |
Fr | Froud number (-) |
LPF | Lubricated pipe flow |
CAF | Core annular flow |
SLF | Self-lubricated flow |
WAF | Water assisted flow |
SRC | Saskatchewan Research Council |
CU | Cranfield University |
ID | Internal diameter |
SS | Stainless steel |
PVC | Polyvinyl chloride |
R2 | Coefficient of Determination |
RMSE | Root-mean-square error |
AARD | Average absolute relative deviation |
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Data Source | Pipe Construction Material | Pipe Diameter (mm) | Average Velocity (m/s) | Oil Viscosity (mPa·s) | Water Viscosity (mPa·s) | Water Fraction (-) |
---|---|---|---|---|---|---|
[6] | SS | 103.3 264.8 | 1.0 1.5 2.0 | 1220 1300 1400 16,600 26,500 | 0.67 0.72 0.89 | 0.17–0.43 |
[17] | PVC | 26 | 0.19–1.728 | 3300 5600 | 1.27 1.00 | 0.30–0.79 |
Pipe Construction Material | Subset | Number of Data Points (%) | Pipe Diameter (mm) | Average Velocity (m/s) | Oil Viscosity (mPa·s) | Water Fraction (-) |
---|---|---|---|---|---|---|
SS | Modeling | 36 (77%) | 103.3 264.8 | 1.0 1.5 2.0 | 1300 1400 26,500 | 0.17–0.43 |
Test | 11 (23%) | 103.3 | 1.0 1.5 2.0 | 1220 16,600 | 0.24–0.42 | |
PVC | Modeling | 21 (72%) | 26 | 0.188–1.719 | 5600 | 0.24–0.79 |
Test | 8 (28%) | 26 | 0.264–1.728 | 3300 | 0.19–0.68 |
Models | R2 | RMSE |
---|---|---|
McKibben et al. | 0.15 | 2.21 |
Shi et al. | −0.11 | 0.80 |
Current model | 0.85 | 0.45 |
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Rushd, S.; Ahmed, E.; Mahmud, S.; Hossain, S.S. A Two-Parameter Model for Water-Lubricated Pipeline Transportation of Unconventional Crudes. Energies 2021, 14, 5665. https://doi.org/10.3390/en14185665
Rushd S, Ahmed E, Mahmud S, Hossain SS. A Two-Parameter Model for Water-Lubricated Pipeline Transportation of Unconventional Crudes. Energies. 2021; 14(18):5665. https://doi.org/10.3390/en14185665
Chicago/Turabian StyleRushd, Sayeed, Ezz Ahmed, Shahriar Mahmud, and SK Safdar Hossain. 2021. "A Two-Parameter Model for Water-Lubricated Pipeline Transportation of Unconventional Crudes" Energies 14, no. 18: 5665. https://doi.org/10.3390/en14185665