Volume 40 Issue 6
Dec.  2023
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LIU He, YU Guowei, YU Chen, et al.Study on downhole drilling fluid colling technology based on surface cooling[J]. Drilling Fluid & Completion Fluid，2023, 40（6）：756-764 doi: 10.12358/j.issn.1001-5620.2023.06.009
Citation: LIU He, YU Guowei, YU Chen, et al.Study on downhole drilling fluid colling technology based on surface cooling[J]. Drilling Fluid & Completion Fluid，2023, 40（6）：756-764 doi: 10.12358/j.issn.1001-5620.2023.06.009
shu

Study on Downhole Drilling Fluid Colling Technology Based on Surface Cooling

doi: 10.12358/j.issn.1001-5620.2023.06.009
  • 1.

    CNPC Bohai Drilling Engineering Co., Ltd, TianJin 300280

  • 2.

    Exploration Development and Construction Engineering Division of PetroChina Jidong Oilfield Company, HeBei 063200l

  • 3.

    School of petroleum engineering, Yangtze University, Wuhan，Hubei 430100

  • 4.

    School of mechanical engineering, Yangtze University, Jingzhou，Hubei 434023

  • Received Date: 2023-05-23
  • Rev Recd Date: 2023-07-08
  • Publish Date: 2023-12-30
    Abstract
  • Presently there are two core problems existed in downhole drilling fluid colling technology, i.e., the necessities of performing drilling fluid cooling and the real time control of the temperature of the downhole drilling fluid. Based on the borehole heat transfer model, the effects of drilling fluid cooling parameters on the downhole temperature are investigated. Based on the non-dominated sorting generic algorithm with elitest strategy, a drilling fluid cooling parameter optimization model is established, and a method for calculating the cooling limit of downhole drilling fluids is constructed. Using the model and the method, the necessity of performing cooling operation can be evaluated. Then, based on the borehole heat transfer model, the quantitative relationship between surface cooling and downhole cooling is investigated, and it is found that a simple linear relationship exists between the change of downhole temperature and the change of surface injection temperature. Based on these relations obtained and the PID control algorithm, a method for real-time control of downhole drilling fluid temperature is developed. The aforementioned models and methods are then verified using data obtained from an example well. The verification shows that using the optimized model of cooling parameters, the downhole cooling limit obtained is 17 ℃ lower than the cooling limit obtained from the non-optimized model. Also, the downhole temperature control method based on PID control can be used to quantitatively control downhole temperature in a real-time manner., thereby minimizing energy consumption of the surface cooling equipment and ensuring the downhole temperature to quickly reach the designed level.

     

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