In process of crude oil production and transportation, wax and other solid deposition issues have a significant impact on oilfield production. Solid precipitation not only reduces the production efficiency and increas...In process of crude oil production and transportation, wax and other solid deposition issues have a significant impact on oilfield production. Solid precipitation not only reduces the production efficiency and increases the cost of production. Therefore, there is a need to study the rate of paraffin wax deposition and cloud point temperature in order to guide the oil field control the paraffin wax deposition. In this paper, we use the Flory theory of polymer solution to correct the liquid activity coefficients, and regular solution theory to correct for the non ideality of the solid mixture, and we consider the impact of isoparaffin. Finally, thermodynamic model is established. The actual example calculation shows that the forecast results of this model are more accurate.展开更多
Suspended asphaltenic heavy organic particles in petroleum fluids may stick to the inner walls of oil wells and pipelines. This is the major reason for fouling and arterial blockage in the petroleum industry. This rep...Suspended asphaltenic heavy organic particles in petroleum fluids may stick to the inner walls of oil wells and pipelines. This is the major reason for fouling and arterial blockage in the petroleum industry. This report is devoted the study of the mechanism of migration of suspended heavy organic particles towards the walls in oil-producing wells and pipelines. In this report we present a detailed analytical model for the heavy organics suspended particle deposition coefficient corresponding to petroleum fluids flow production conditions in oil wells. We predict the rate of particle deposition during various turbulent flow regimes. The turbulent boundary layer theory and the concepts of mass transfer are utilized to model and calculate the particle deposition rates on the walls of flowing conduits. The developed model accounts for the eddy diffusivity, and Brownian diffusivity as well as for inertial effects. The analysis presented in this paper shows that rates of particle deposition （during petroleum fluid production） on the walls of the flowing channel due solely to diffusion effects are small. It is also shown that deposition rates decrease with increasing particle size. However, when the process is momentum controlled （large particle sizes） higher deposition rates are expected.展开更多
某油田采油及集输系统存在结蜡、结垢及腐蚀现象,在原油物性分析的基础上,结合调查中存在的各种结蜡现象,分析温度、压力、溶解气及机械杂质等因素对结蜡的影响;通过结垢调查、水质分析、结垢可能性分析及结垢分析系统软件OLI Systems I...某油田采油及集输系统存在结蜡、结垢及腐蚀现象,在原油物性分析的基础上,结合调查中存在的各种结蜡现象,分析温度、压力、溶解气及机械杂质等因素对结蜡的影响;通过结垢调查、水质分析、结垢可能性分析及结垢分析系统软件OLI Systems IncScaleChem 3.1结垢预测,分析水质、温度对结垢的影响及结垢垢型。结果表明:该油田原油含蜡量高(17.09%~22.96%),析蜡点高(52.92~60.66℃),地层温度较低(40~70℃),可促进结蜡;原油开采过程中,由于油气混合物压力降低导致的大量伴生气析出吸热及环境温度降低等原因,造成原油温度降低促进结蜡,原油组分变化过程先促进而后抑制结蜡,浅部井存在的砂等机械杂质促进结蜡;该油田结垢类型为BaSO4垢,生产过程采出水温度降低,BaSO4垢结垢趋势增大,最大结垢量变化不明显,结垢趋势增大量及最大结垢量与成垢阴阳离子含量成正相关关系,不同来源的采出水水质差异大,成垢阴阳离子含量高,相互配伍性差,促进结垢;超高的Cl-含量抑制腐蚀,采出液较低的pH值、一定含量的游离CO_(2)、H2S、SRB及垢下腐蚀能够促进腐蚀。展开更多
By screening solvents and surfactants,a surfactant with strong wetting and dispersing ability has been discovered,which can form stable emulsions.An O/W emulsifier that can inhibit paraffin deposition and remove it ha...By screening solvents and surfactants,a surfactant with strong wetting and dispersing ability has been discovered,which can form stable emulsions.An O/W emulsifier that can inhibit paraffin deposition and remove it has been acquired by an orthogonal design of experiment.The density of the emulsion is 0.9 g/cm3,the removal rate of paraffin is 150 g/（mL·min）,and the inhibiting rate of paraffin is 20.70%.When 0.8%～1.5%（mass fraction） sodium chloride is added to the emulsion,the deemulsification time is 1.5～4.0 h.展开更多
文摘In process of crude oil production and transportation, wax and other solid deposition issues have a significant impact on oilfield production. Solid precipitation not only reduces the production efficiency and increases the cost of production. Therefore, there is a need to study the rate of paraffin wax deposition and cloud point temperature in order to guide the oil field control the paraffin wax deposition. In this paper, we use the Flory theory of polymer solution to correct the liquid activity coefficients, and regular solution theory to correct for the non ideality of the solid mixture, and we consider the impact of isoparaffin. Finally, thermodynamic model is established. The actual example calculation shows that the forecast results of this model are more accurate.
文摘Suspended asphaltenic heavy organic particles in petroleum fluids may stick to the inner walls of oil wells and pipelines. This is the major reason for fouling and arterial blockage in the petroleum industry. This report is devoted the study of the mechanism of migration of suspended heavy organic particles towards the walls in oil-producing wells and pipelines. In this report we present a detailed analytical model for the heavy organics suspended particle deposition coefficient corresponding to petroleum fluids flow production conditions in oil wells. We predict the rate of particle deposition during various turbulent flow regimes. The turbulent boundary layer theory and the concepts of mass transfer are utilized to model and calculate the particle deposition rates on the walls of flowing conduits. The developed model accounts for the eddy diffusivity, and Brownian diffusivity as well as for inertial effects. The analysis presented in this paper shows that rates of particle deposition （during petroleum fluid production） on the walls of the flowing channel due solely to diffusion effects are small. It is also shown that deposition rates decrease with increasing particle size. However, when the process is momentum controlled （large particle sizes） higher deposition rates are expected.
文摘某油田采油及集输系统存在结蜡、结垢及腐蚀现象,在原油物性分析的基础上,结合调查中存在的各种结蜡现象,分析温度、压力、溶解气及机械杂质等因素对结蜡的影响;通过结垢调查、水质分析、结垢可能性分析及结垢分析系统软件OLI Systems IncScaleChem 3.1结垢预测,分析水质、温度对结垢的影响及结垢垢型。结果表明:该油田原油含蜡量高(17.09%~22.96%),析蜡点高(52.92~60.66℃),地层温度较低(40~70℃),可促进结蜡;原油开采过程中,由于油气混合物压力降低导致的大量伴生气析出吸热及环境温度降低等原因,造成原油温度降低促进结蜡,原油组分变化过程先促进而后抑制结蜡,浅部井存在的砂等机械杂质促进结蜡;该油田结垢类型为BaSO4垢,生产过程采出水温度降低,BaSO4垢结垢趋势增大,最大结垢量变化不明显,结垢趋势增大量及最大结垢量与成垢阴阳离子含量成正相关关系,不同来源的采出水水质差异大,成垢阴阳离子含量高,相互配伍性差,促进结垢;超高的Cl-含量抑制腐蚀,采出液较低的pH值、一定含量的游离CO_(2)、H2S、SRB及垢下腐蚀能够促进腐蚀。
文摘By screening solvents and surfactants,a surfactant with strong wetting and dispersing ability has been discovered,which can form stable emulsions.An O/W emulsifier that can inhibit paraffin deposition and remove it has been acquired by an orthogonal design of experiment.The density of the emulsion is 0.9 g/cm3,the removal rate of paraffin is 150 g/（mL·min）,and the inhibiting rate of paraffin is 20.70%.When 0.8%～1.5%（mass fraction） sodium chloride is added to the emulsion,the deemulsification time is 1.5～4.0 h.
