Title:
OFFSHORE CASING SURGE COMPENSATION DUAL-DRIVE THREE-LAYER CASING DRILLING AND CORING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/151751
Kind Code:
A1
Abstract:
Disclosed is an offshore casing surge compensation dual-drive three-layer casing drilling and coring method. A drilling ship is positioned at set longitude and latitude coordinates by means of a dynamic positioning system, a drilling rod is stabilized by means of a seabed base plate, torque and drilling pressure can be transmitted by means of wellhead casing surge compensation during casing drilling, and during sampling drilling, the surge compensation can compensate for water depth changes caused by rising tides, falling tides or surges within a certain range, preventing a casing from colliding with equipment, and ensuring wellhead operation safety. Three-layer casing drilling is implemented by means of dual drive heads, effectively protecting a well wall, so that the drilling sampling coring rate is high, and the coring quality is good. Compared with common drilling methods, the present invention has advantages such as high drilling efficiency, high coring rate, simple equipment, high reliability and low costs, and is not only suitable for general sedimentary rock strata shallow drilling, but also for difficult coring strata such as reef limestone strata and sandy soil layers.
Inventors:
TIAN LIEYU (CN)
GUO WU (CN)
YANG NAN (CN)
LI ZHANZHAO (CN)
GUO WU (CN)
YANG NAN (CN)
LI ZHANZHAO (CN)
Application Number:
PCT/CN2021/118981
Publication Date:
July 21, 2022
Filing Date:
September 17, 2021
Export Citation:
Assignee:
GUANGZHOU MARINE GEOLOGICAL SURVEY (CN)
International Classes:
E21B25/18; E21B17/00; E21B21/00; E21B41/00
Domestic Patent References:
| WO2020169255A1 | 2020-08-27 |
Foreign References:
| CN113914803A | 2022-01-11 | |||
| CN111980613A | 2020-11-24 | |||
| EP1103459A1 | 2001-05-30 | |||
| CN209025628U | 2019-06-25 | |||
| CN102913162A | 2013-02-06 | |||
| CN110578486A | 2019-12-17 | |||
| US20100224360A1 | 2010-09-09 | |||
| CN108547587A | 2018-09-18 | |||
| CN210888838U | 2020-06-30 |
Attorney, Agent or Firm:
GUANGZHOU KEYUE I.P. LAW OFFICE (CN)
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