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含蜡原油的屈服性能直接影响其管输安全,当温度降低时,含蜡原油析出的蜡晶与其中的胶质、沥青质相互作用形成具有一定强度的三维空间网络结构,在外剪切力作用下,该结构屈服裂降,存在一个屈服值,即屈服应力。通过应变扫描实验法对长庆、大庆、环江、冀东4种含蜡原油进行流变性测试,结果表明:含蜡原油在线性黏弹区内储能模量基本不变,应力与应变呈线性递增关系,其线性黏弹区随着温度的升高而增大;含蜡原油的储能模量与屈服值在双对数坐标图上呈现线性递增关系,可以用结构屈服系数表示含蜡原油屈服时结构的强弱,该系数等于储能模量和屈服值的对数比值。与其他方法相比,该方法获得的屈服值结果更加稳定,易于形成相关标准。(图2,表2,参9)
The yield properties of waxy crude oil have a direct impact on the safety of pipeline transportation. When the temperature decreases, the wax crystals precipitated from the waxy crude oil interact with the gums and asphaltenes to form a three-dimensional network structure with certain strength. Under the action of external shearing force Under the structure, the structure yield split, there is a yield value, that is yield stress. The rheological properties of four kinds of waxy crude oil in Changqing, Daqing, Huanjiang and Jidong were tested by strain-sweep method. The results showed that the storage modulus of waxy crude oil in the linear viscoelastic region remained unchanged, and the stress and strain The linear viscoelastic region increases with the increase of temperature. The storage modulus and yield value of waxy crude oil show a linear increasing relationship on the logarithmic graph, and the yield coefficient of the wax can be used to indicate the content of wax The structure of crude oil yield strength, the coefficient is equal to the storage modulus and yield value of the logarithmic ratio. Compared with other methods, the yield value obtained by this method is more stable and easy to form the relevant standard. (Figure 2, Table 2, reference 9)