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- Title
油气钻井岩屑沉降阻力计算模型.
- Authors
孙晓峰; 张克博; 陈烨; 曲晶瑀; 汤捷; 屈俊波
- Abstract
In the process of oil and gas well drilling, the broken cuttings settle freely in the drilling fluid in the wellbore. To avoid downhole accidents caused by the cuttings settlement, therefore, it is necessary to study the cuttings settlement laws and predict the terminal cuttings settlement velocity. In this paper, a concept of resistance scale between viscosity and differential pressure was put forward based on the Stokes law and Newton-Rittinger model. Then, the equation of resistance scale was obtained by regressing the experiment data using the least square method. Finally, the resistance scale calculation model was derived for non-Stokes zone during the cuttings settlement in Newtonian fluids and power-law fluids. Furthermore, based on experimental data, the terminal cuttings settling velocity was calculated by using the new models. The following results were obtained. First, the viscosity and differential pressure on the cuttings during their settlement in power-law fluids are not only related to the particle Reynolds number, but to the flow behavior index and consistency index. Second, during the cuttings settlement in Newtonian fluids, the viscosity is higher than the differential pressure if the particle Reynolds number is less than 2.944 6. Third, the differential pressure is higher than the viscosity if the particle Reynolds number is higher than 2.944 6. Fourth, when the particle Reynolds number is lower than 1.11, the viscosity plays a dominant role in cuttings settlement; when the number is 1.11-500, cuttings settlement is under the joint effect of viscosity and differential pressure; when the number is higher than 500, the differential pressure is dominant. In conclusion, this calculation model can be used to predict the terminal settlement velocity of cuttings with a particle Reynolds number of 0-105 when the drilling fluid is a Newtonian fluid, and the terminal settlement velocity of cuttings with a particle Reynolds number of 0-105 and a flow behavior index of 0.062 3-1 when the drilling fluid is a power-law fluid. These mentioned ranges can satisfy the drilling engineering requirements on the prediction of terminal cuttings settlement velocity.
- Publication
Natural Gas Industry, 2018, Vol 38, Issue 5, p94
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2018.05.011