Prediction Model and Distribution Law Study of Temperature and Pressure of the Wellbore in drilling in Arctic Region

YU Yi; WANG Xuerui; KE Ke; WANG Di; YU Xin; GAO Yonghai

doi:10.11911/syztjs.2021047

Volume 49 Issue 3

May 2021

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Petroleum Drilling Techniques > 2021 > 49(3): 11-20. > DOI: 10.11911/syztjs.2021047

YU Yi, WANG Xuerui, KE Ke, WANG Di, YU Xin, GAO Yonghai. Prediction Model and Distribution Law Study of Temperature and Pressure of the Wellbore in drilling in Arctic Region[J]. Petroleum Drilling Techniques, 2021, 49(3): 11-20. DOI: 10.11911/syztjs.2021047

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Prediction Model and Distribution Law Study of Temperature and Pressure of the Wellbore in drilling in Arctic Region

YU Yi^1,,
WANG Xuerui²,
KE Ke³,
WANG Di²,
YU Xin²,
GAO Yonghai^2, ,

1.
Zhanjiang Branch of CNOOC Ltd., Zhanjiang, Guangdong, 524057, China
2.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, 266580, China
3.
Sinopec Research Institute of Petroleum Engineering, Beijing, 102206, China

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Received Date: January 01, 2021
Revised Date: March 30, 2021
Available Online: April 27, 2021

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Abstract

Abstract

The low temperature condition of permafrost in Arctic region affects the rheology of drilling fluids and the distribution of temperature and pressure in the wellbore during drilling. In order to understand the influence law of permafrost in Arctic region on the temperature and pressure distribution in wellbore and provide a basis for the design and construction for drilling in Arctic region, a model to predict the wellbore temperature and pressure of drilling in Arctic region was built. It was based on the analysis of the influence of low temperatures on the rheology of water-based and oil-based drilling fluids, considering the coupling between permafrost and wellbore. By comparing the measured and test results, it was verified that the prediction accuracy of the proposed model met the requirements of drilling in Arctic region. The model was used to simulate the temperature and pressure distribution in a wellbore in Arctic region under the conditions of no circulation or pump function. The results showed that the drilling fluids absorbed the heat of the high-temperature formation and returned to the annulus transferring the heat to the permafrost in shallow part of the wellbore during the circulation. This process thawed the permafrost near the wellbore and the wellbore temperature was lowered due to the heat consumed by thawing. The circulating friction in annulus increases with the increase of circulation time. The longer the pump shutdown lasts, the closer the temperature of drilling fluid to the formation temperature in the wellbore. The larger the annular circulation pressure loss, and the higher the pump pressure. The research results can provide a basis and guidance for design and construction of drilling in Arctic region.

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