西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (4): 122-126.

• 石油与天然气工程 • Previous Articles     Next Articles

Study on the Rheological Properties of Ultra-high TemperatureDrilling Fluids

Bu Hai1，2, Sun Jinsheng2, Wang Chengbiao1, Yang Zexing2, Yang Yuping2   

  1. 1. School of Engineering & Technology，China University of Geosciences（Beijing），Haidian，Beijing 100083，China2. Research Institute of Drilling Engineering，CNPC，Haidian，Beijing 100083，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-08-01 Published:2012-08-01

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Abstract: The rheological properties of ultra-high temperature drilling fluids developed in our laboratory are measured using
Fann50SL HT-HP rheometer and the experimental data with the temperature from 90 ℃ to 240 ℃ were analyzed using
the regression method. The experimental results show that the apparent viscosity and plastic viscosity of ultra-high temperature
drilling fluids decrease with temperature increasing under high pressure conditions，but slightly increase in viscosity after
210 ℃. The results of regression analysis show that the Casson rheological model can describe the rheological properties of
ultra-high temperature drilling fluids under high temperature and high pressure conditions，and the mathematical model is established
to predict the apparent viscosity of ultra-high temperature drilling fluids under high temperature and high pressure
conditions. The verification by experimental data indicates that the calculation results of mathematical model keep high consistence
with the measured data，which provides scientific basis for field applications of ultra-high temperature drilling fluids.

Key words: drilling fluids, high temperature and high press, rheological model, mathematical model

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