Abstract:

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.

摘要： 针对常规测量方法只能测量常压下脱气原油凝点的不足，提出了落球法测量高压含气原油凝点的新方法，分析了测量的原理，设计了一套高压含气原油凝点测量装置，比较了该装置和常规方法对常压脱气原油的测量结果，测量了不同溶解气油比、不同压力下含气原油的凝点，分析了压力和溶解气对原油凝点的影响。结果表明，对于常压脱气原油，该装置的测量结果与常规方法吻合。压力对原油的凝点有一定的影响，随压力的升高凝点上升，在本试验条件下，压力每上升2MPa，凝点上升0.7℃；溶解气油比对原油的凝点有影响，含气原油的凝点低于脱气原油的凝点，对所研究的油样来说，溶解气油比每增加10m³·m^-3，凝点大约降低1℃。本研究结果可为高含蜡油田的生产管理和油气集输设计提供依据。