当代化工
噹代化工
당대화공
CONTEMPORARY CHEMICAL INDUSTRY
2014年
5期
736-738
,共3页
韩洪升%宋灵剑%管庆安%湛志国%董莹莹
韓洪升%宋靈劍%管慶安%湛誌國%董瑩瑩
한홍승%송령검%관경안%담지국%동형형
胶凝原油%连续剪切%触变性
膠凝原油%連續剪切%觸變性
효응원유%련속전절%촉변성
Gelled waxy crude oil%Continuous shearing%Thixotropy
胶凝含蜡原油由于其蜡晶的三维网状空间结构，具有复杂的流变性。胶凝原油的流变性质一直是研究的重点和热点。很多学者对胶凝原油的性质做了详细而又深入的研究，但这些研究一般集中在恒定剪切速率上，对胶凝原油的连续剪切的研究较少。通过控制不同的降温速率和胶凝温度，来研究胶凝原油连续剪切的变化规律。实验结果表明，当降温速率越大时，初始的粘度越小，但剪切一段时间后，不同降温速率下的粘度无多大差别；当胶凝温度越低是，其初始的结构强度越大，并且在结构破坏以后，在同一剪切速率下，其粘度也越大，但不同温度下的差距在减小；当从高到低的剪切情况下，其粘度随着剪切速率的减小，呈增大的趋势，并且这趋势越来越明显，相对于从低到高的剪切情况下，在同一剪切速率下，从低到高情况下的粘度比从高到低的粘度要大。
膠凝含蠟原油由于其蠟晶的三維網狀空間結構，具有複雜的流變性。膠凝原油的流變性質一直是研究的重點和熱點。很多學者對膠凝原油的性質做瞭詳細而又深入的研究，但這些研究一般集中在恆定剪切速率上，對膠凝原油的連續剪切的研究較少。通過控製不同的降溫速率和膠凝溫度，來研究膠凝原油連續剪切的變化規律。實驗結果錶明，噹降溫速率越大時，初始的粘度越小，但剪切一段時間後，不同降溫速率下的粘度無多大差彆；噹膠凝溫度越低是，其初始的結構彊度越大，併且在結構破壞以後，在同一剪切速率下，其粘度也越大，但不同溫度下的差距在減小；噹從高到低的剪切情況下，其粘度隨著剪切速率的減小，呈增大的趨勢，併且這趨勢越來越明顯，相對于從低到高的剪切情況下，在同一剪切速率下，從低到高情況下的粘度比從高到低的粘度要大。
효응함사원유유우기사정적삼유망상공간결구，구유복잡적류변성。효응원유적류변성질일직시연구적중점화열점。흔다학자대효응원유적성질주료상세이우심입적연구，단저사연구일반집중재항정전절속솔상，대효응원유적련속전절적연구교소。통과공제불동적강온속솔화효응온도，래연구효응원유련속전절적변화규률。실험결과표명，당강온속솔월대시，초시적점도월소，단전절일단시간후，불동강온속솔하적점도무다대차별；당효응온도월저시，기초시적결구강도월대，병차재결구파배이후，재동일전절속솔하，기점도야월대，단불동온도하적차거재감소；당종고도저적전절정황하，기점도수착전절속솔적감소，정증대적추세，병차저추세월래월명현，상대우종저도고적전절정황하，재동일전절속솔하，종저도고정황하적점도비종고도저적점도요대。
Gelled waxy crude oil has complex rheological property because of three-dimensional network of wax crystal in the gelled waxy crude oil. Research on the rheological property of the gelled waxy crude oil is the key point and hot point. Many scholars had carried out an in-depth study on the property of the gelled waxy crude oil, but the studies mainly focused on the constantly rate of shear, and there was few research on the continuous shear. In this paper, change rules of the gelled waxy crude oil in continuous shearing were studied by controlling the cooling rate and gelatinization temperature. The experimental results indicate that, the higher the cooling rate, the smaller the initial viscosity ,but after a period of shearing, the cooling rate has little effect on the viscosity;the lower the gelatinization temperature, the stronger the initial structural strength is, and the viscosity is higher under the same shearing rate after the structural damage, but the difference is decreasing; the viscosity increases with decreasing of the shearing rate under the circumstance of the shearing rate decreasing from high rate to low rate, and the tendency is more obvious with decreasing of shearing rate; under the same shearing rate, the viscosity under the circumstance of the shearing rate increasing from low rate to high rate is higher than that under the circumstance of the shearing rate decreasing from high rate to low rate.
