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校验了本所开发的压力毛细管流变仪,用它测量牛顿流体的粘度误差不超过5％。使用该仪器测定了钻井液用聚合物水溶液在10~5秒~(-1)下的剪切降解作用;使用该仪器和 RV-2流变仪研究了上述溶液在恒温下、宽剪切速率范围内的流变行为;用该毛细管流变仪测得10~5秒~(-1)下的粘度值可为喷射钻井优选流变参数提供准确的水眼粘度值。RV-2流变仪在低、中剪切速率(5.4-1312秒~(-1))下测得的流参变数在 IBM PC/XT 微机上按卡森模式计算出的10~5秒~(-1)下的粘度值与该压力毛细管流变仪的实测值往往偏差很大。所以,为保证喷射钻井优选流变参数,应该采用毛细管流变仪实际测定井浆高剪切速率下的粘度值。
The pressure capillary rheometer developed by our laboratory was calibrated to measure no more than 5% viscosity error of Newtonian fluids. The apparatus was used to measure the shear degradation of polymer aqueous solution of drilling fluid at 10 ~ 5 seconds -1. With the instrument and RV-2 rheometer, the shear rate of the solution at constant temperature The capillary rheometer measured the viscosity at 10 ~ 5 seconds -1 to provide the accurate water-eye viscosity value for the optimal rheological parameters of jet drilling. RV-2 rheometer measured at low and medium shear rate (5.4-1312 seconds -1) flow parameters measured in the IBM PC / XT PC by Carson mode calculated 10 ~ 5 seconds ~ (-1) and the pressure capillary rheometer measured values tend to deviate significantly. Therefore, in order to ensure the optimal rheological parameters of jet drilling, the capillary rheometer should be used to determine the viscosity of the slurry at high shear rate.