Journal of Applied Science and Engineering

Published by Tamkang University Press


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Geng Hao1,2This email address is being protected from spambots. You need JavaScript enabled to view it., Xiong Qingshan1,2, Cui Shuqing3, Liuyu1,2, Shi Fang1,2, Kamgue Lenwoue Arnaud Regis1,2, Wang Ke1,2, Shou Xiang4

1School of petroleum engineering, Yangtze University, Wuhan 430100, China

2School of Petroleum Engineering, Yangtze University: National Engineering Research. Center for Oil & Gas Drilling and Completion Technology. Wuhan 430100, China

3Petroleum China Huabei Oilfield Company. Cangzhou 062550, China

4Chengdu Best Diamond Drill Bit Co. LTD. Chengdu 610000, China


Received: February 24, 2023
Accepted: August 4, 2023
Publication Date: September 20, 2023

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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High pressure, narrow mud window and well control risks are common challenges encountered in High Temperature High Pressure (HTHP) wells. Reducing the complexity of incidents and ensuring the safety while drilling in high pressure and narrow mud window wells are technical challenges which need to be urgently solved. Managed Pressure Drilling (MPD) effectively solves the challenges of safety drilling under narrow safe pressure margin by establishing a trapped pressure environment to control the annular pressure profile. However, the risk of down hole pressure fluctuation still exists due to the switch of circulation from downhole circulation to surface circulation during connection in MPD mode. Continuous Circulation System (CCS) is usually used to maintain the full cycle circulation during connection, but the system is also not able to precisely predict the formation pressure and immediately adjust the bottom hole pressure. In this research, the MPD technology combined with the Eni circulating device (e-cdTM) system is presented to overcome the shortages of MPD and CCS technologies when they are individually applied in high temperature high pressure wells. The application of this combined practice in the Obiafu-X well located in Block OML-61, Delta, Nigeria enabled to avoid the occurrence of various non-production time accidents and improved the drilling efficiency. The combination of MPD technology with e-cdTM system in HTHP wells can therefore provide an advantageous reference in the domestic HTHP drilling industry.

Keywords: Wellbore instabilities; High temperature high pressure; Managed pressure drilling; Continuous Circulation System

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