新疆塔河重质原油及其乳状液不同温度和压力下的粘度

Viscosities of Tahe Heavy Crude Oil and its Emulsions with Water at Various Temperatures and Hydrostatic Pressures

自行设计并制造了高温高压落球法液体粘度测定仪,简介了主要构件,用乙二醇、丙二醇、丙三醇等校准,粘度测定值的相对误差小于1%。在温度分别为40℃、50℃、60℃、70℃、80℃,流体静压力分别为0.1、1、5、10、15、20MPa,含水率分别为0%、10%、20%、30%、50%、70%、90%的条件下,测定了新疆塔河油田高粘重质原油(含蜡4.14%,密度0.9586g/cm3)及其水乳状液的粘度,共计得到了210个粘度数据并列表给出。粘度随温度升高而降低,符合一段规律。在每一含水率和温度下,粘度随流体静压力升高而增大,增幅随温度升高而减小。在每一流体静压力下,粘度～含水率曲线通过峰值,峰值位于含水率20%处,峰高随温度升高而减小,含水率超过20%后原油乳状液由油包水型转变为水包油型。给出了4组粘度～温度和粘度～含水率曲线作为示例。典型粘度数据:781.4mPa·s(含水0%,50℃,0.1MPa);1406mPa·s(含水0%,50℃,20MPa);431.5mPa·s(含水30%,50℃,0.1MPa)。图5表1参2。

A high temperature and high pressure falling ball viscosimeter is designed and constructed with its main elements described in brief and calibrated by using ethyleneglycol, propyleneglycol, glycerine, and others to give determinations of viscosity with ralative error <1%. The viscosities of viscous heavy crude oil (wax content 4.14% and av. density 0.958 6 g/cm^3) from Tahe oil field in Xinjiang and of its emulsions of water content 10%, 20%, 30%,50%,70%, and 90% are determined by using this viscosimeter at temperatures 40℃,50℃,60℃,70℃, and 80℃ and at hydrostatic pressures 0.1, 1, 5, 10, 15, and 20 MPa. Totally 210 data of viscosity are obtained and presented in a table. For the crude oil and its emulsions, the viscosity decreases with temperature raising as a common rule; at every given water content and temperature the viscosity increases with pressure increasing and the increment in viscosity decreaes with temperature raising; at every given pressure the viscosity vz water content curves go theough a peak at water content 20%, the height of which is lowered with temperature raising and beyond which the W/O emulsions turn into O/W ones. Four sets of viscosity vz temperature and vz water content curves are demonstrated as examples. Some typical viscosity date are as follows: 781.4 mPa·s at 50℃ and 0.1 MPa and 1 406 mPa·s at 50℃ and 20 MPa for crude oil; 431.5 mPa·s at 50℃ and 0.1 MPa for crude oil emulsion of water content 30%.