Study of deposition behavior in small-diameter gathering pipelines for water-cut oil

Liu, Yang; Wang, Zhi Hua; Zhuge, Xianglong; Zhao, Shengbo; Pang, Renshan

doi:10.1007/s10553-012-0385-5

Cited by 15 publications

(10 citation statements)

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“…In this paper, the waxy crude oil in the Daqing oilfield was selected. 20 The multiphase system mainly includes oil, paraffin, asphaltene, and water, and the phase transition point was 65.2% (the water cut corresponds to the transition point from W/O emulsion to O/W emulsion). The WAT was 345.15 K. The peak wax precipitation point was 295.15 K. The minimum temperature at which the oil acts as a Newtonian fluid was 315.15 K. The oil pour point was 310.15 K. The weight percent of each component in the multiphase system is shown in Table 1.…”

Section: Simulation Methodologymentioning

confidence: 99%

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Molecular Dynamics Simulation of Waxy Crude Oil Multiphase System Depositing and Sticking on Pipeline Inner Walls and the Micro Influence Mechanism of Surface Physical–Chemical Characteristics

et al. 2021

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For ensuring the safe and stable operation of waxy crude oil pipeline transportation, in this research, the molecular dynamics model was established to characterize the deposition and wall sticking behavior of waxy crude oil multiphase system pipeline transportation. The equal density interpolation fitting method was proposed to determine the wall contact angle of simulation results. Through verification, the error between the simulation results and the experimental results measured by Dos Santos et al. (2006) was less than 5%, which showed that the established model was accurate and reliable. Using the established model, the deposition and wall sticking behavior of waxy crude oil nucleated clusters was simulated. It was found that the nucleated clusters would first adhere to the wall surface to form the solidified oil layer. Then, the wax and asphaltene molecules would diffuse to the deposit layer, and the oil molecules in the solidified oil layer reverse diffused to the direction of the oil flow. With the adhering and spreading degree of clusters on the wall surface increasing, the deposit layer gradually aged, and the gelled deposit layer with a higher density and hardness would form. On this basis, the micro influence mechanism of the surface free energy was studied. It was found that the higher the surface free energy, the more hydrophilic the pipeline wall was, and the higher the adhesion degree would be. Moreover, based on the ABF sampling and the potential of mean force calculations, the selective deposition process of waxy crude oil deposited on the sedimentary layer was studied. The micro information on the deposition sites, the binding conformation, and the binding energy of different molecules in clusters deposited on different molecules in sedimentary layer were analyzed. The investigations in this study could provide theoretical support for paraffin removal and control, which could ensure the safe and stable operation of the waxy crude oil production system.

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Section: Simulation Methodologymentioning

confidence: 99%

“…In this paper, the waxy crude oil in the Daqing oilfield was selected . The multiphase system mainly includes oil, paraffin, asphaltene, and water, and the phase transition point was 65.2% (the water cut corresponds to the transition point from W/O emulsion to O/W emulsion).…”

Section: Simulation Methodologymentioning

confidence: 99%

Molecular Dynamics Simulation of Waxy Crude Oil Multiphase System Depositing and Sticking on Pipeline Inner Walls and the Micro Influence Mechanism of Surface Physical–Chemical Characteristics

et al. 2021

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“…The world demand for crude oil has increased from 6.0ˆ10 7 barrels (bbls) per day to 8.4ˆ10 7 barrels per day in the last 20 years [1]. It is well known that pipelines as a mean of transporting crude oil from the producing field to the treatment station or the refinery are the least expensive, the most effective and environmentally convenient and have been widely used in the gathering process at the oilfield and for downstream fuel supply [2,3]. The pressure drop loss in the pipeline must be lowered to decrease the pump power to push the oil economically for a long distance [4].…”

Section: Introductionmentioning

confidence: 99%

The Use of Biobased Surfactant Obtained by Enzymatic Syntheses for Wax Deposition Inhibition and Drag Reduction in Crude Oil Pipelines

Wang

et al. 2016

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Abstract:Crude oil plays an important role in providing the energy supply of the world, and pipelines have long been recognized as the safest and most efficient means of transporting oil and its products. However, the transportation process also faces the challenges of asphaltene-paraffin structural interactions, pipeline pressure losses and energy consumption. In order to determine the role of drag-reducing surfactant additives in the transportation of crude oils, experiments of wax deposition inhibition and drag reduction of different oil in pipelines with a biobased surfactant obtained by enzymatic syntheses were carried out. The results indicated that heavy oil transportation in the pipeline is remarkably enhanced by creating stable oil-in-water (O/W) emulsion with the surfactant additive. The wax appearance temperature (WAT) and pour point were modified, and the formation of a space-filling network of interlocking wax crystals was prevented at low temperature by adding a small concentration of the surfactant additive. A maximum viscosity reduction of 70% and a drag reduction of 40% for light crude oil flows in pipelines were obtained with the surfactant additive at a concentration of 100 mg/L. Furthermore, a successful field application of the drag-reducing surfactant in a light crude oil pipeline in Daqing Oilfield was demonstrated. Hence, the use of biobased surfactant obtained by enzymatic syntheses in oil transportation is a potential method to address the current challenges, which could result in a significant energy savings and a considerable reduction of the operating cost.

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“…In this paper, the waxy crude oil in Daqing oilfield was selected; a multiphase system mainly including oil, paraffin, asphaltene, and water was employed. The wax appearance temperature was 325.15 K. The peak wax precipitation point was 295.15 K. The minimum temperature at which the oil acts as a Newtonian fluid was 315.15 K. The oil pour point was 310.15 K. The weight percent of each component in the multiphase system is shown in Table .…”

Section: Simulation Methodologymentioning

confidence: 99%

Molecular Dynamics Simulation of the Nucleation and Gelation Process for a Waxy Crude Oil Multiphase System under Different Physical–Chemical Influencing Factors

et al. 2019

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The molecular dynamics model was established to characterize the homogeneous and heterogeneous nucleation processes for a waxy crude oil multiphase system at the nanoscale. Using the established model, the homogeneous and heterogeneous nucleation processes were numerically simulated, and the accuracy of the model was verified by comparing the simulation results with those of classic nucleation theory. On this basis, the micromechanism for the effect of different cooling rates on the nucleation process was studied, and it was determined that the homogeneous and heterogeneous nucleation would coexist and compete with each other in the initial stage and, at last, a large spherical cluster would form. Furthermore, the calculation model for the interfacial free energy was proposed, the interfacial free energy with nucleation centers of different specific area factors were numerically calculated, and the influence rules of the interface effects on the nucleation process were clarified. Besides, the heterogeneous nucleation process of different nucleation center materials was simulated, and the aggregation degree and element composition of nucleation clusters were analyzed. Finally, the influence mechanism of doping ions on the nucleation process was investigated. The investigations in this study provided a theoretical basis for ensuring a safe and economic operation of waxy crude oil production.

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Study of deposition behavior in small-diameter gathering pipelines for water-cut oil

Cited by 15 publications

References 1 publication

Molecular Dynamics Simulation of Waxy Crude Oil Multiphase System Depositing and Sticking on Pipeline Inner Walls and the Micro Influence Mechanism of Surface Physical–Chemical Characteristics

Molecular Dynamics Simulation of Waxy Crude Oil Multiphase System Depositing and Sticking on Pipeline Inner Walls and the Micro Influence Mechanism of Surface Physical–Chemical Characteristics

The Use of Biobased Surfactant Obtained by Enzymatic Syntheses for Wax Deposition Inhibition and Drag Reduction in Crude Oil Pipelines

Molecular Dynamics Simulation of the Nucleation and Gelation Process for a Waxy Crude Oil Multiphase System under Different Physical–Chemical Influencing Factors

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