Method and equipment for optimizing hydraulic parameters of deepwater managed pressure drilling in real time

US11203922B1 · kind B1 · utility

Assignees

• CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) · CN
• Zhanjiang Branch of CNOOC (China) Co., Ltd · CN

Inventors

• Baojiang Sun · Shandong, CN
• Zhiyuan Wang · Qingdao, CN
• Shujie Liu · Cupertino, US
• Yonghai Gao · Shandong, CN
• Baitao FAN · Zhanjiang, CN
• Hao Li · Poing, DE
• Shen Guan · Beijing, CN
• Haikang He · Qingdao, CN
• Bangtang Yin · Qingdao, CN
• Xiaohui Sun · Beijing, CN
• Xuerui Wang · Dongying, CN

Key dates

• Filing date: Mar 19, 2021
• Grant date: Dec 21, 2021
• Expiry date: Mar 19, 2041

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B2200/20
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

The present invention provides a method and equipment for optimizing hydraulic parameters of deepwater managed pressure drilling in real time. The method comprises: acquiring overflow parameters in the current drilling process, performing preprocessing and feature extraction on the overflow parameters, and inputting the overflow parameters into trained support vector machine identification models for overflow judgment. If overflow occurs at the current drilling depth, reducing an opening of a throttle valve and increasing a displacement of a submarine pump, measuring a wellhead back pressure and calculating a bottom hole pressure, and judging whether overflow continues is performed. If overflow continues, mixing high-density drilling fluid with the original drilling fluid, pumping the mixture into a wellbore annulus, and performing the above operations of reducing the throttle valve opening, increasing the displacement of the submarine pump, calculating the bottom hole pressure and judging whether overflow continues is performed until overflow no longer occurs.