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Effect of asphaltenes on the thermal properties of emulsions encountered in oil recovery operations

机译:沥青质对采油操作中遇到的乳液热学性能的影响

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Fabrication temperature of crude oil and bitumen emulsions was found to produce a very strong impact on dynamic viscosities eta and activation energies of a viscous flow E_(act). An anomalous increase of both eta and E_(act) was observed in emulsions, fabricated at 36 deg C, while fabrication at 45 deg C improved the flow properties. The narrow critical range of thermally-induced anomalies extends from approx= 30 to approx= 42 deg C, as revealed by studies of a matrix crude oil. At room temperature the materials retained a long-term memory of fabrication conditions. We suggest that the anomalous thermal effects are triggered by a structural phase transition in the asphaltene/resin molecular subsystem. Below the wax appearance temperature structurally modified asphaltene particles evidently act as cementing species in extended networks of wax crystals.
机译:发现原油和沥青乳液的制造温度对动态粘度η和粘性流E_(act)的活化能产生非常强烈的影响。在36℃下制备的乳液中观察到η和E_(act)都异常增加,而在45℃下制备则改善了流动性。如对基质原油的研究所揭示的,热致异常的狭窄临界范围从大约30摄氏度扩展到大约42摄氏度。在室温下,材料保留了制造条件的长期记忆。我们建议,异常热效应是由沥青质/树脂分子子系统中的结构相变触发的。在蜡出现温度以下,结构改性的沥青质颗粒显然充当蜡晶体扩展网络中的胶结物质。

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