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Mitsubishi Heavy Industr ies, Ltd.Technical Review Vol. 43 No. 1 (Ja n. 2006)
1
The Latest Technology of
"CHIKYU", Deep Sea Drill Ship
1. Int roduction1. Int roduction1. Int roduction1. Int roduction1. Int roduction
"CHIKYU", a deep sea dril l ship, was delivered to the
J apa n Agency for Marin e-Ea rth Science an d Techn ology
(JAMSTE C) in J uly 2005. Const ru ction of "CHIKYU",
featuring the latest technology in this f ield, opens up a
new era of deep sea dril l ing, with a scient ific dri l l shipadopting th e r iser dr i l ling meth od for the very first t ime
in th e world. This scientif ic dri l l ship was bu il t for the
pur poses of clar ifying long-time environmen ta l chan ges
in the ear th , exploring l ife in the eart h's crust , stu dying
the m echan ism of ear thqua kes an d so for th , through in-
v e s t i g a t i on d e e p i n t o t h e e a r t h ' s co r e . Th i s p a p e r
int roduces th e Hoist ing Equ ipment , Dual E levator Sys-
tem, Core Sam pl ing System an d Waste Mud Treatm ent
System t ha t form a par t of the new technologies devel-
oped an d a dopted in t he bu ilding of "CHIKYU".
2. Hoist ing Equ ipment2. Hoist ing Equ ipment2. Hoist ing Equ ipment2. Hoist ing Equ ipment2. Hoist ing Equ ipment
The h oist ing equipmen t for l i ft ing a nd lower ing the
drill pipe, the r iser pipe and th e Blow-out Pr eventer (BOP)
is inst alled in th e derrick. The ship ha s been engineered
to operat e in severe environmen tal conditions, a nywhere
in th e world. It is a lso int ended t o be capa ble of riser drill-
ing in deeper water and of achieving a dr i l l ing depth,
deeper th an ever before. Through a nalysis of the balance
between the hu l l mot ion a nd t he weight /ver t ical vibra-
tion/strength of the su spended sub-sea equipment u nder
these conditions, th e rat ed load of the derrick and hoist-
ing equipmen t (Traveling Block, Crown Mount ed Hea ve
Compensa tor (CMC), Riser H and l ing E quipment , Wire
Rope, etc.) of th is ship wa s designed t o be 1 250 tons, th e
world's largest , in cont ra st t o that of most other s imilar
oil drill ships, which is approximately 907 tons. Accord-
ingly, the d errick an d hoisting equipment of this s hip were
specially developed as u p-rated versions, the stren gth of
which ha s been confirmed. Good operabil i ty an d safetyfeatu res h ave also been achieved taking int o consideration
equipment- to-equipment inter face, equipment layout ,
equipment a utomat ion an d so forth .
3. Aut omation of th e Dual E levator System3. Aut omation of th e Dual E levator System3. Aut omation of th e Dual E levator System3. Aut omation of th e Dual E levator System3. Aut omation of th e Dual E levator System
During dr il ling operation, if th e pipe is suspen ded on
the dril l floor using a wedge known as 'slips' , high st ress
is generat ed which mak es th e deep dr i l l ing impossible.
For this reason, existing scientif ic dri l l ships adopt the
meth od of sus pendin g the pipe by using two elevators
alter na tely. However, al l work (including at ta ching an d
detaching) i s performed ma nu al ly using two elevators.
In t he cas e of "CHIKYU", however, a t ru e du al elevator
system for th e integra ted cont rol and operat ion of th e
two elevators ha s been developed an d adopted. This sys-
t em a utomat i ca l ly de tect s t he work be ing done by th e
two elevators an d also their operat ing condition a nd with
th e provision of various int erlocks on a ll equipment , in-
cluding peripher al equipment , this ena bles drill ing work
to be performed safely and efficiently.
Fig. 1 Dual elevator
1250t
1250t
1250t
1250t
1250t
907.2 t
907.2 t
680.4 t
453.6 t
Table 1 Hoisting equipment rated load
Hoisting Equipment Rated Load (t) Remarks
Travelling Block
1 250 MT Link
Riser Handling Elevator
Riser Running Tool
Crown Block (CMC)
Power Swivel (main load path)
System Link
Dual Elevator
Hydraulic Elevator
World's largest
World's largest
World's largest
World's largest
World's largest
Presently in service
Presently in service
World's first
Presently in service
integrated control
TAKASHI OHMURA*1
TAKAYUKI YAMAGAMI*1
TOMOYA INOUE*2
EIICHI HIGASHI*1
KAZUYASU WADA*2
*1
*2
Nagasaki Shipyard & Machinery WorksJapan Agency for Marine-Ear th Science and Technology
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2
Mitsubishi Heavy Industr ies, Ltd.Technical Review Vol. 43 No. 1 (Ja n. 2006)
4. Core S ampling System4. Core Sa mpling System4. Core S ampling System4. Core Sa mpling System4. Core Sa mpling System
The m ost impor ta nt pur pose of "CHIKYU" is to ob-
tain the targeted core f rom deep dr i l l ing depth. Sincecon t i nuous co r e s am p l i ng i s r equ i r ed , t he W i r e l ine
method ha s been adopted for t he f ir st t ime in th e wor ld
by a r iser dr i ll ship. With t his met hod, another cont ainer
called a core ba rr el is placed inside the d ril l pipe, a bit
wi th a hol low center dr i l l s the wel l and the container
lifts t he core onto th e ship. The featu re of this meth od is
to retr ieve the core with out l ift ing or lowering th e dril l
pipe, which ena bles efficient coring. The h ydra ulic pis-
ton cor ing system (HPCS) to obtain soft sedimen t , th e
extended s hoe cor ing system (ESCS) to obtain sl ight ly
ha rder s ediment , the rota ry core bar rel (RCB) to obta in
ha rd r ock, etc. ha ve each been developed for use, depen d-
ing on th e well .
5. Drill Waste Trea tmen t System5. Drill Wast e Treatm ent System5. Drill Waste Trea tmen t System5. Drill Wast e Treatm ent System5. Drill Waste Trea tmen t System
To accord with i ts s ta tu s a s a "Scient ific Drill Ship",
"CHIKYU" adopts th e concept of zero wast e dischar ge toenable worldwide drilling operation. Discharge water con-
ta ining mu d is distilled an d filtered for r e-use a s drill water.
Deteriorat ed mud is cohered and th en dehydrat ed by pres-
sur ization, mixed with cement, bagged and tr an sferred by
supply boat t o an onsh ore treat ment facility. Cut tings ar e
t ra nsfer red by vacuum equipment , mixed wi th cement ,
bagged and tr an sported ashore. Treat ment of cutt ings is
impor ta nt for maint aining th e expected dr i l l ing speed.
Therefore, this tr eatment system was t ested on-board us-
ing cutt ings generat ed by actual dri l ling and a maximum
trea tmen t capa city of 20 tons/hour was confirmed.
6. Conclusion6. Conclusion6. Conclusion6. Conclusion6. Conclusion
"CHIKYU" is expected t o star t regu lar opera tions in
2007 as th e pr incipal dr i l l ship in t he Int egrated Ocean
Drilling Program (IODP). In th e future, th is ship intends
to dr i l l into the sea bed to a depth of 4 000 meters . To
rea lize this, it will be necessar y to develop deep sea dr ill-
ing techn ology incorporat ing new knowledge obta ined
from opera tional experien ce, as well as n ew techn ology
f r om t he O i l D r i ll i ng I ndu s t r y. T he cons t r u c t i on o f
"CHIKYU" is just t he f irst step a nd furt her d evelopment
wil l be necessar y, in order to reach a s yet u nexploredfields of sub-sea r esear ch.
Fig. 2 HPCS and RCB
Hydropiston Corer
Thrust Core Barrel intosoil under high pressure.
Extract Core Barrel tosample core.
Core sample
Core sample
HPCS: A system forcore sampling in softsoil layers such asalluvial deposit.
Rotary Corer
RCB: A system forcore sampling in hardlayers such as rock bed.
Core sampling by boringinto soil layer.
Big bag fillingsystem
Fig. 3 Waste Mud Treatment System flow
Drill DrainTank
Waste Mud
Tank
FilteredwaterDrill Water
Tank
Drill DrainThickening System
Evaporatedwater
Cohesion/
Dehydration System
Squeezed liquid
Evaporated WaterFiltration System
Onboard Drill Waste Treatment System
Cuttings TransferSystem
SludgeStabilizedsludge
StabilizingTank Unit
Cuttings
StabilizingMixer
Shale shaker
Cuttingschute
Big bag
Bags to bebrought outby crane.
Drill drain
Wastemud
Takashi Ohmura Eiichi Higashi Takayuki Yamagami
Kazuyasu Wada Tomoya Inoue
