High temperature and high pressure rheological properties of high-density water-based drilling fluids for deep wells

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• 作者：Fuhua Wang (1)
  Xuechao Tan (1)
  Ruihe Wang (1)
  Mingbo Sun (1)
  Li Wang (2)
  Jianghua Liu (3)
  
• 关键词：High ; density water ; based drilling fluid ; rheological behavior ; clay ; high temperature high pressure ; linear fitting ; rheological model ; mathematical model
• 刊名：Petroleum Science
• 出版年：2012
• 出版时间：September 2012
• 年：2012
• 卷：9
• 期：3
• 页码：354-362
• 全文大小：340KB
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• 作者单位：Fuhua Wang (1)
  Xuechao Tan (1)
  Ruihe Wang (1)
  Mingbo Sun (1)
  Li Wang (2)
  Jianghua Liu (3)
  
  1. College of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong, 266555, China
  2. Institute of Oil Production Engineering, Daqing Oil Company, Daqing, Heilongjiang, 163453, China
  3. Institute of Oil Production Technology, Xinjiang Oil Company, Kelamayi, Xinjiang, 834000, China
  
• ISSN：1995-8226

文摘

To maintain tight control over rheological properties of high-density water-based drilling fluids, it is essential to understand the factors influencing the rheology of water-based drilling fluids. This paper examines temperature effects on the rheological properties of two types of high-density water-based drilling fluids (fresh water-based and brine-based) under high temperature and high pressure (HTHP) with a Farm 50SL rheometer. On the basis of the water-based drilling fluid systems formulated in laboratory, this paper mainly describes the influences of different types and concentration of clay, the content of a colloid stabilizer named GHJ-1 and fluid density on the rheological parameters such as viscosity and shear stress. In addition, the effects of aging temperature and aging time of the drilling fluid on these parameters were also examined. Clay content and proportions for different densities of brine-based fluids were recommended to effectively regulate the rheological properties. Four rheological models, the Bingham, power law, Casson and H-B models, were employed to fit the rheological parameters. It turns out that the H-B model was the best one to describe the rheological properties of the high-density drilling fluid under HTHP conditions and power law model produced the worst fit. In addition, a new mathematical model that describes the apparent viscosity as a function of temperature and pressure was established and has been applied on site.