Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering ConferenceShanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Design of an Integrated Sampling System for Seabed Drilling and Grabbing
Xueyu Rena,Xiaoqing Penga,b,Xiaoling Lea,Tao Lianga,Peng Zhoua, Ziqiang Rena,b, Dongrui Ruana,Lieyu Tianc,JiaWang Chena,b,*aOcean college, Zhejiang University, Zhoushan,China,bHainan Institute, Zhejiang University,Sanya ,China,cGuangzhou Marine Geological Survey, Guangzhou, China*Corresponding author : JiaWang Chen

ABSTRACT

100 meters (Ross E. Murray, 2010). The 2500-meter drilling rig (BGS)
developed by the British Geological Survey can obtain 5-meter-longcores and integrate a camera monitoring system (Sven Petersen, 2005).
The BMS-2 (Benthic Multicoring System) developed by Williamson &Associates in the United States successfully drilled 4.4 m core samples
in the waters near the Ogasawara Islands in the East China Sea (5815 mwater depth) in 2006 (Freudenthal T, 2009). PROD (Portable RemotelyOperated Drill) is a multifunctional seabed drilling and geotechnicaltesting system developed by BENTHIC in Australia, while in hardformations rotary drilling corers are used (Kelleher P, 2008). The MeBo(Meeresboden - Bohrgerät) seabed drilling rig developed in Germany issuitable for water depths up to 2000m, with a single drilling depth of
3.5m (Freudenthal T, 2010). The American Williamson & Associatescompany delivered the ACS (Automatic Coring System) seabed
automatic coring system to the National Institute of Ocean Technologyof India in February 2010. RE, 2010). The ROVDrill developed byHELIX CANYON OFFSHORE in the United States is a new type ofseabed drilling rig system combined with ROV technology, which has
the functions of drilling and coring and in-situ testing (Spencer A, 2008).
To sum up, there is almost no lightweight system that can simultaneously
obtain serialized columnar cores and surface sediments at the same point.
More comprehensive samples can realize the intuitive and accuratecomparison and analysis of seabed rock formations and surface rocks.
Therefore, the system provides technical and equipment support formarine scientific exploration.

In order to meet the needs of seabed solid mineral resources and seabedgeological environment investigation, this paper studies a set of seabeddrilling and grab integrated sampling system suitable for deep sea. Thesystem is equipped with seabed rock sample drilling system andhydraulic mechanical grab equipment, which can not only drill seabedcolumnar core samples, but also grab massive rock samples on theseabed surface, and realize a variety of sampling functions at the bottomof the pedestal.

KEY WORDS: Seabed drill; grab; deep-sea core;
INTRODUCTION
Marine sediment cores are essential samples for research in marinegeology, marine biology, paleoenvironmental science, and deep-sea
mineral resource development. Due to the ocean has been transported byrivers, heavy metals transported by the atmosphere, remains of marineorganisms, and isotopic fractionation between seawater and theatmosphere, the deep-sea cores are less disturbed by the outsideenvironment and can provide a more continuous record, which contains
extremely rich information. The most important material forunderstanding the history of Earth's climate change and marine
biogeographical distribution information, and deep-sea surface
sediments are key samples for studying contemporary provenance andsediment transport characteristics, as well as microbial research.

The composition of drilling and grabbing integrated system
The drilling and grabbing integrated sampling system has an operating
depth of 4,000 meters, and can simultaneously obtain cores with a lengthof 1.5 meters, a diameter of 48 mm, and seabed surface rocks with avolume of not less than 0.03 cubic meters. The sampling system ismainly composed of rotary drilling system, mechanical hydraulic grabsystem, hydraulic power system and measurement and control system.
The device uses a deep streamer to hoist the sample to the seabed. During
the hoisting process, the compass mounted on the system is used tomonitor its attitude in real time. If the attitude changes greatly, thepropeller is used to rectify its deviation to ensure its attitude stability,

At present, the sampling of marine core and surface samples mainly
includes gravity corers, vibration samplers, deep-sea drilling rigs, andclam samplers. Gravity corers and vibratory samplers are only used invery soft or loose geological conditions, and the coring depth of thesemethods is also limited to the length of their single core barrel. It has its
limitations to extend the coring depth by lengthening the core barrel.
Deep-sea drilling rigs are often too bulky, clam-type samplers are mostly
used in lakes, rivers and shallow seas, and deep-sea applications are less.
The 3000 meters deep-sea drilling rig developed by India weighs 13 tons
and can obtain core samples with a diameter of 63.5 mm and a length of23