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research-article

An innovative device to enhance conductor bearing capacity in deepwater drilling operations

[+] Author and Article Information
Kanhua Su

School of Petroleum Engineering, Chongqing University of Science & Technology No. 20 Daxuecheng East Road, Shapingba District, Chongqing, China Chongqing, 401331 China
sukanhua@126.com

Jianming Yang

Faculty of Engineering and Applied Science, Memorial University Memorial University St John's, NL A1B 3X5 Canada
jyang@mun.ca

Stephen D. Butt

EN4032G, Advanced Drilling Group Faculty of Engineering, Memorial University St. John's, NL A1B 3X5 Canada
sdbutt@mun.ca

1Corresponding author.

ASME doi:10.1115/1.4037830 History: Received January 20, 2017; Revised August 17, 2017

Abstract

Deepwater environments raise higher demand on the bearing capacity of the drilling conductor below the mud line. To deal with this problem, a conductor bearing capacity enhancement device was designed. The setting capability of this device and its axial bearing capacity were analyzed with soil mechanics and pile theory. Furthermore, a calculation model is developed, and a numerical method is used to solve for the lateral capacity, coupled with drilling platform, riser, conductor, seabed soft soil and the device. The result shows that proper setting depth of the device is primarily determined by the property of the soil, rather than the conductor jetting operation. Additionally, appropriate determination of the diameter and wall thickness of this device can greatly improve the lateral bearing capacity of the conductor.

Copyright (c) 2017 by ASME
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