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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11959346 B1

PDFFull Text
Date of Patent:
Apr. 16, 2024

Filed:

Sep. 17, 2021

Method for offshore dual-drive core drilling with three layers of casings under surge compensation

Applicant:

Guangzhou Marine Geological Survey, Guangzhou, CN;

Inventors:

Lieyu Tian, Guangzhou, CN;

Wu Guo, Guangzhou, CN;

Nan Yang, Guangzhou, CN;

Zhanzhao Li, Guangzhou, CN;

Assignee:

GUANGZHOU MARINE GEOLOGICAL SURVEY, Guangzhou, CN;

Attorney:

Bayramoglu Law Offices LLC

Primary Examiner:

Aaron L Lembo

Int. Cl.
CPC ...
E21B 25/18 (2006.01); E21B 7/12 (2006.01); E21B 15/02 (2006.01); E21B 19/00 (2006.01); E21B 19/16 (2006.01); E21B 21/00 (2006.01); E21B 21/06 (2006.01);
U.S. Cl.
CPC ...
E21B 25/18 (2013.01); E21B 7/12 (2013.01); E21B 15/02 (2013.01); E21B 19/002 (2013.01); E21B 19/16 (2013.01); E21B 21/001 (2013.01); E21B 21/063 (2013.01);
Abstract

A method for offshore dual-drive core drilling with three layers of casings under surge compensation is provided. According to the method, a drilling vessel is located at set latitude and longitude coordinates by a dynamic positioning system; drill pipes are stabilized by a seabed template; torques and drilling pressures can be transmitted during drilling of the casings by means of surge compensation of the casings at a wellhead; during drilling for sampling, the surge compensation can compensate to a certain extent for a change in water depth caused by rising or falling tides, or surge, thereby preventing the casings from colliding with equipment and ensuring the safety of wellhead operation; and the drilling of three layers of casings is achieved by means of dual driver heads to effectively protect a wellbore wall, such that high core-drilling rate and good core-drilling quality are achieved during drilling for sampling.

Find Patent Forward Citations

Tian, Lieyu. (2024). Method for offshore dual-drive core drilling with three layers of casings under surge compensation (U.S. Patent No. 11959346). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/11959346

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