The gel point of crude oil is one of the important parameters for oil and gas field development, oil and gas storage and transportation.The conventional method can only measure the gel point of the crude oil free of g...The gel point of crude oil is one of the important parameters for oil and gas field development, oil and gas storage and transportation.The conventional method can only measure the gel point of the crude oil free of gas under atmospheric pressure.A new method for measuring the crude oil with dissolved gas under high pressure based on a new measurement principle was proposed.A new instrument of gel point measurement for crude oil with dissolved gas under high pressure was designed.The result measured by the new instrument was compared with that measured by the conventional method.The effect of pressure and solution gas-oil ratio on the gel point of crude oil was studied.Experiments showed that the results measured by the new instrument coincided with that by the conventional method for crude oil free of gas under atmospheric pressure.Under the same solution gas-oil ratio, the gel point of crude oil with dissolved gas increased with pressure, the gel point increased by 0.7℃ with 2.0 MPa pressure increment in the experimental conditions.The gel point of crude oil with dissolved gas decreased with solution gas-oil ratio under the same pressure, the gel point decreased by 1.0℃ with 10.0 m3·m-3 solution gas-oil ratio increment in the experimental conditions.The result is of importance to the management of waxy oil production and the design for oil and gas storage and transportation.展开更多
文摘页岩的吸附解吸特性对页岩气资源开发具有重要意义。为深入了解页岩中黏土矿物微观吸附机理,利用Material Studio分子模拟软件构建了伊利石、蒙脱石和高岭石3种黏土矿物分子模型,采用巨正则Monte Carlo(GCMC)方法对3种模型的等温吸附量和吸附热进行了模拟计算。研究表明,在相同温度和压力条件下3种黏土矿物对CH4分子的吸附量大小顺序是伊利石>蒙脱石>高岭石;随压力增大3种黏土矿物对CH4分子的吸附量均有所增加,而且伊利石和蒙脱石对CH4分子的吸附量对压力变化更为敏感;3种黏土矿物的等量吸附热均小于42 k J·mol-1,对CH4的吸附为物理吸附;随着温度的升高,CH4分子的吸附热和吸附量均减小。
文摘The gel point of crude oil is one of the important parameters for oil and gas field development, oil and gas storage and transportation.The conventional method can only measure the gel point of the crude oil free of gas under atmospheric pressure.A new method for measuring the crude oil with dissolved gas under high pressure based on a new measurement principle was proposed.A new instrument of gel point measurement for crude oil with dissolved gas under high pressure was designed.The result measured by the new instrument was compared with that measured by the conventional method.The effect of pressure and solution gas-oil ratio on the gel point of crude oil was studied.Experiments showed that the results measured by the new instrument coincided with that by the conventional method for crude oil free of gas under atmospheric pressure.Under the same solution gas-oil ratio, the gel point of crude oil with dissolved gas increased with pressure, the gel point increased by 0.7℃ with 2.0 MPa pressure increment in the experimental conditions.The gel point of crude oil with dissolved gas decreased with solution gas-oil ratio under the same pressure, the gel point decreased by 1.0℃ with 10.0 m3·m-3 solution gas-oil ratio increment in the experimental conditions.The result is of importance to the management of waxy oil production and the design for oil and gas storage and transportation.