Navio perfurador científico D/V CHIKYU - Science and Technology
Navio entregue em Julho de 2005 à The Japan Agency for Marine-Earth Science and Technology, com
dimensões 210 x 38 x 9,20m
Início das operações em 15 de Dezembro de 2005
Tonelagem GT 57,000
Velocidade 12 nós
Produção de energia eléctrica 35.000KW
Capacidade do helicópetro 30 pessoas
Capacidade de perfuração de 7 Km da crosta terrestre
A Crosta terrestre é menos conhecida que a Lua
Os cientistas dispôem de uma mala cheia de conhecimentos da Lua, ao contrário, têem uma mala vazia
de conhecimentos da Crosta terrestre marinha ao centro da terra.
Na imagem é visível o furo rectangular, (12x22m) para lançamento dos tubos, sem ser afectado pela
ondulação do mar . Ponto 14 da descrição geral.
Azimute propulsor (diâmetro 4m)
1-entrada, 2-salva vidas, 3-azimute propulsor, 4-ponte de comando, 5-heliporto, 6-instalações dos tripulantes
tais como jacuzi, ginásio, sala de conferências, sala de convívio, cabines, sala de vídeo/cinema, sala de refeições
etc., 7-torre de perfuração, 8-andar técnico de perfuração, 9-laboratório, 10-guindaste, 11- zona dos tubos de perfuração,
12-zona de circulação das lamas provenientes da perfuração, 13-sala das máquinas, 14-furo rectangular, (12x22m) de baixo
da torre de perfuração, para lançamento dos tubos, 15-equipamento de perfuração.
Cientistas a bordo do navio perfurador científico japonês D/V CHIKYU, penetraram
a camada fóssil do Magma no Oceano Pacífico a 800 Km Oeste da Costa Rica a 1.400 m abaixo do leito marinho. Noticiado em 20
de Abril de 2006
A formação da Crosta do Oceano é um processo chave no ciclo das placas tectônicas que conduz
aos terramotos e formação dos vulcões.
O programa de perfuração integrado do Oceano (Integrated Ocean Drilling Program-IODP) é um
programa de pesquisa marinho internacional dedicado à compreensão científica da Terra.
Sustentado por um consórcio europeu composto por 17 países e da República Popular da China.
As operações de perfuração são conduzidas por Instituições dos EUA
Caso pretenda, posso disponibilizar o link da simulação de perfuração efectuada pelo citado
D/V CHIKYU uses GPS positioning data from satellites and an acoustic positioning
system that communicates with transponders on the ocean floor, to specify its position and measure the forces acting on the
ship (wind, wave, and current direction and speed).
Those data are used to predict the direction and speed at which
the ship could deviate from its position. Based on those predictions, computer-controlled thrusters (huge propellers that
can rotate 360 degree) apply counter-thrust in opposition to that deviation to hold the D/V CHIKYU in position. D/V CHIKYU
can continue drilling for months or a year in surface currents up to 3-4 knots, wind speeds of up to 23 meters per second,
and wave heights of up to 4.5 meters.
D/V CHIKYU is a first riser equipped science drill ship to reach the deeper
part of the Earth. What is the difference from the previous scientific drilling? Why does D/V CHIKYU can drill such a deep
part? We approach to the mystery of the drilling ability of D/V CHIKYU. D/V CHIKYU has a riser drilling system, which
has been used in the oil and gas industry. For scientific research applications it is the first time to have such a system.
Riser pipe guides the drill pipe for reentering to the well, and downhole measurement tools and devices for lowering and setting
in the hole. is the artificial drilling fluid, which is chemically and physically composed. Mud is circulated from the drilling
vessel by using high pressure pumps onboard down through inside the drill pipes, and returns up the annulus between the drill
pipe and the borehole, the casing and riser pipe to the vessel. There are multiple benefits of the riser drilling with having
the mud circulations while drilling and of the borehole itself. This is the major key when drilling to depths thousand of
meters below the sea floor. Further Blow Out Preventer (BOP) makes safe drilling even where there is unexpected high pressure
flow of gas, oil or other formation fluids from the well.
By use of the riser,
* Circulate drilling fluid,
mud, * Re-enter drilling pipe easily, * Lower large diameter of measuring/monitoring devices, not limited to the inner
diameter of the drilling pipe.
By circulation of the mud
* Increase mud water weight, to counter-balance the
formation pressure, * reinforce wall of the borehole by mud ingredients (mud cake), * exploit viscosity of mud to
displace drilling cuttings (scraped formation particles) smoothly * sample drilling cuttings (scraped formation particles)
on board to evaluate formation layers.
The cylindrical rock and sediment samples taken from the deep Earth is called
and it is a key to find the figure of the Earth, however, the core is a living materials and its nature changes every moment
due to environment difference. D/V CHIKYU equips with the onboard laboratory for competent, complex and quick analysis.
9 meters long core samples moved from the drill floor through catwalk are cut into sections of 1.5 meters in length. Each
core section is provided an ID barcode (indicating the expedition number, drill hole number, core number, and section number).
These data are stored in the database.
It measures CT value of whole core and construct inner view of the core, before
the core is distracted its physical property and structure by cut to half. To measure inner heterogeneity of the core, this
device provides more information for using sample more efficiently and effectively.
In the study of microbiology and
geochemistry, gases and fluids are important samples as well as solid core. Therefore, high quality gas / fluid sampling is
required. The QA/QC Sampling Room enables non-contaminated sampling in anaerobic atmosphere.
are living in a low temperature and anaerobic environment, which can be killed or mutated by long-time exposure in the aerobic
environment under room temperature. Microbiology Lab. provides various equipments for sampling and storage for subsurface
microorganisms such as anaerobic glove box, freezer (under -80 degree C) and incubator.
Split a 1.5 meters long whole
core into working and archive halves. Working half is for distributed to researchers as discrete samples for on-board and
onshore analyses. Archive half is for stored in a core case for permanent archiving after description and non-destructive
physical property measurements (density, magnetic susceptibility...etc.).
Discrete samples taken from the working
half core are purified for each analysis by centrifugal separation and/or filtering.
High precision residual magnetization
measurement of the core is done in a magnetic shield room, for age determination and paleo-environmental research.
observations are done for paleontological / petrological studies such as fossil age determination, paleo-environment, petrogenesis
and crustal environment.