scholarly journals Continental Scientific Drilling (CSD): Technology Barriers to Deep Drilling Studies in Thermal Regimes

1987 ◽  
Author(s):  
George A. Kolstad ◽  
John C. Rowley
Keyword(s):  
Deep Drilling ◽  
Technology Barriers ◽  
Scientific Drilling ◽  
Thermal Regimes

scholarly journals Why deep drilling in the Colônia Basin (Brazil)?

2015 ◽  
Vol 20 ◽  
pp. 33-39 ◽  
Author(s):  
M.-P. Ledru ◽  
W. U. Reimold ◽  
D. Ariztegui ◽  
E. Bard ◽  
A. P. Crósta ◽  
...  
Keyword(s):  
Tropical Rainforest ◽  
Sao Paulo ◽  
South American ◽  
São Paulo ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Southwestern Margin ◽  
The University ◽  
The City ◽  
Drilling Project

Abstract. The Colônia Deep Drilling Project held its first International Continental Scientific Drilling Program (ICDP) workshop in September 2014 at the University of São Paulo (Brazil). Twenty-seven experts from six countries discussed the feasibility and the expectations of a deep drilling in the structure of Colônia located at the southwestern margin of the city of São Paulo. After presenting the studies performed at the site during the last decades, participants focused on the objectives, priorities and detailed planning for a full deep-drilling proposal. An excursion to the site and new auger coring showed the importance of the Colônia site for studying the evolution of a tropical rainforest and to evaluate the interplay between the South American summer monsoon, the Intertropical Convergence Zone (ITCZ) and the southern Westerlies belt during the last 5 million years. In addition, deep drilling will eventually solve the still unresolved issue of the origin of the structure of Colônia as a result of meteorite impact or endogenous processes.

Fatigue Evaluation of Drill Pipes for Scientific Drilling Program by Applying Non-Stop Driller Concept

2019 ◽  
Author(s):  
Tomoya Inoue ◽  
Masahiko Fujikubo ◽  
Kenji Nakano ◽  
Noriaki Sakurai
Keyword(s):  
Time Series ◽  
Fatigue Strength ◽  
Nankai Trough ◽  
Drilling Fluid ◽  
Drill Pipe ◽  
Ship Motions ◽  
Bending Stress ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Drilling Equipment

Abstract The scientific drilling vessel Chikyu is performing Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), a challenging deep drilling activity, for scientific purpose. We faced difficulty to drill deep during past NanTroSEIZE operations due to unstable sediments and insufficient cutting removal. Non-Stop Driller concept is, therefore, applied for the operation of NanTroSEIZE scheduled to start Oct. 2018 to enable continuous circulation of drilling fluid circulation. The Non-Stop Driller concept requires an additional, specially-designed sub called an “NSD sub” with a ball valve for drilling fluid inlet. Generally, the fatigue strength of a drill pipe is a critical factor governing the performance of challenging deep drilling. This study, therefore, focused on the fatigue failure of the NSD sub due to the bending stress caused by interference with risers including flex joints, ship structure, or drilling equipment resulting from ship motions. The bending stress leads to cyclic stress caused by rotation of the drill pipe. This is especially the case at the Nankai Trough where ocean currents are very strong reaching or sometimes exceeding 4 knots, a high bending stress is assumed to be exerted on the NSD sub. Full-scale fatigue tests of the NSD sub were first conducted to acquire the actual fatigue curve. Further, the bending stress distribution of a drill pipe, which refers to the locus of the bending stress during the drilling operation, was analyzed by considering interference of the drill string with the structure, drilling equipment, and risers that are deformed by the ocean current. Time-series ship motions is prepared using the response amplitude operators of the Chikyu for the sea states at Nankai Trough area, and then time-series stress response is obtained by considering the operational conditions such as rate of penetration and rotational velocity of drill pipe. The numbers of occurrence of each stress amplitude can be counted from the time-series stress response. Consequently, the cumulative damage ratio is calculated for evaluating the fatigue of the NSD sub. The results confirmed that the cumulative fatigue is within a safe range. This study focused on the evaluation of the fatigue strength of the specially designed NSD sub for the challenging scientific drilling operation at Nankai Trough, a harsh environment because of the presence of strong ocean currents. This paper presents the overview of NanTroSEIZE including the Non-Stop Driller concept, and the results of fatigue evaluations.

Drill String Strength Evaluation for Deep Earthquake Zone Drilling

2012 ◽  
Author(s):  
Tomoya Inoue ◽  
Masanori Kyo ◽  
Koji Sakura ◽  
Toshihiko Fukui
Keyword(s):  
Nankai Trough ◽  
Drill Pipe ◽  
High Strength ◽  
Seismogenic Zone ◽  
Deep Drilling ◽  
Deep Earthquake ◽  
Strength Evaluation ◽  
Scientific Drilling ◽  
Drill Pipes ◽  
Earthquake Zone

The scientific drilling vessel Chikyu was designed to have the deep drilling capability to reach the deep earthquake zone. To realize such deep drilling, a drill pipe with higher than ever strength and reliability is of necessity. A strength evaluation of such high strength drill pipe is also necessary. Around Japan, the earthquake zones are widely located under the seabed in deep water. For example, the Nankai Trough located beneath the ocean off the southwest coast of Japan is one of the most active earthquake zones where large-scale earthquakes have occurred repeatedly throughout history. Thus, the Chikyu has started the first scientific drilling at the Nankai Trough as the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). NanTroSEIZE targets the megasplay fault zone at 3500 m below the seafloor and finally 6000m deep drilling into the seismogenic zone and across the plate interface into the subducting crust at water depths of around 2500m. In addition, a huge earthquake zone is expected to be located about 1000m below the seafloor at water depths of around 7000m. For this drilling task, the riserless drilling technique should be applied. To realize such deep drilling with both riser and riserless techniques, a S150 drill pipe was developed during the construction phase and has been used in the past scientific drillings of the Chikyu. For deeper drillings in the future and drilling operations in harsh environments, we are developing superior high strength drill pipes, S155 and S160, possessing high reliability including corrosion resistance to achieve high toughness and reduction of stress concentration. An evaluation of the maximum possible stress was conducted. In the maximum strength evaluation, we considered dynamic stress and bending stress due to the current and the vessel inclination. This paper describes the development of superior high strength drill pipes and the strength evaluation of such drill pipes for deep earthquake zone drilling.

scholarly journals Probing reservoir-triggered earthquakes in Koyna, India, through scientific deep drilling

2014 ◽  
Vol 18 ◽  
pp. 5-9 ◽  
Author(s):  
H. Gupta ◽  
S. Nayak ◽  
W. Ellsworth ◽  
Y. J. B. Rao ◽  
S. Rajan ◽  
...  
Keyword(s):  
Near Field ◽  
Field Observations ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Triggered Earthquakes ◽  
Course Of Action ◽  
The World ◽  
The Future ◽  
Broad Framework ◽  
Salient Features

Abstract. We report here the salient features of the recently concluded International Continental Scientific Drilling Program (ICDP) workshop in Koyna, India. This workshop was a sequel to the earlier held ICDP workshop in Hyderabad and Koyna in 2011. A total of 49 experts (37 from India and 12 from 8 other countries) spent 3 days reviewing the work carried out during the last 3 years based on the recommendations of the 2011 workshop and suggesting the future course of action, including detailed planning for a full deep drilling proposal in Koyna, India. It was unanimously concluded that Koyna is one of the best sites anywhere in the world to investigate genesis of triggered earthquakes from near-field observations. A broad framework of the activities for the next phase leading to deep drilling has been worked out.

Integrated deep drilling, coring, downhole logging, and data management in the Chicxulub Scientific Drilling Project (CSDP), Mexico

2004 ◽  
Vol 39 (6) ◽  
pp. 791-797 ◽  
Author(s):  
Lothar Wohlgemuth ◽  
Eckhard Bintakies ◽  
Jochem Kück ◽  
Ronald Conze ◽  
Ulrich Harms
Keyword(s):  
Data Management ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Drilling Project

scholarly journals Superdeep Tests and Experiments at 9.1 km and 4 km

2016 ◽  
Vol 2 ◽  
Author(s):  
Ulrich Harms ◽  
Jochem Kück
Keyword(s):  
Large Diameter ◽  
Crystalline Basement ◽  
Deep Drilling ◽  
In Situ Tests ◽  
Scientific Drilling ◽  
Basement Rocks ◽  
The Town ◽  
Continental Deep Drilling ◽  
Drilling Project

The Continental Deep Drilling Program of Germany (in German: Kontinentales Tiefbohrprogramm der Bundesrepublik Deutschland, abbreviated as KTB) was a scientific drilling project near the town of Windischeschenbach, Bavaria. The KTB Depth Laboratory comprises two 9.1 km and 4 km deep, water-filled boreholes in crystalline basement rocks just 200 meters apart from each other. Available equipment such as cables, winches, geophysical borehole tools as well as workshops and office infrastructure allows for in-situ tests and experiments at different pressure and temperature conditions. The two stable wells are large-diameter steel-cased and have been geophysically monitored in detail since 1996.

Scientific drilling: Limitations to drilling and logging in thermal regimes

Eos ◽  
1990 ◽  
Vol 71 (12) ◽  
pp. 337 ◽  
Author(s):  
Peter Lysne ◽  
Ronald Jacobson
Keyword(s):  
Scientific Drilling ◽  
Thermal Regimes

scholarly journals The environmental and evolutionary history of Lake Ohrid (FYROM/Albania): Interim results from the SCOPSCO deep drilling project

2016 ◽  
Author(s):  
Bernd Wagner ◽  
Thomas Wilke ◽  
Alexander Francke ◽  
Christian Albrecht ◽  
Henrike Baumgarten ◽  
...  
Keyword(s):  
Environmental Change ◽  
De Novo ◽  
High Water ◽  
Lake Ohrid ◽  
Climatic Impact ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Refugial Area ◽  
Drilling Project

Abstract. This study reviews and synthesises existing information generated within the SCOPSCO ("Scientific Collaboration on Past Speciation Conditions in Lake Ohrid") deep drilling project. The four main aims of the project are to infer (i) the age and origin of Lake Ohrid (Former Yugoslav Republic of Macedonia/Republic of Albania), (ii) its regional seismotectonic history, (iii) volcanic activity and climate change in the central northern Mediterranean region, and (iv) the drivers of biodiversity and endemism. The Ohrid basin formed by transtension during the Miocene, opened during the Pliocene and Pleistocene, and the lake established de novo in the still relatively narrow valley between 1.9 and 1.3 Myr ago. The lake history is recorded in a 584 m long sediment sequence, which was recovered within the framework of the International Continental Scientific Drilling Program (ICDP) from the central part (DEEP site) of the lake in spring 2013. To date, 50 tephra and crypto-tephra horizons have been found in the upper 460 m of this sequence. Tephrochronology and tuning biogeochemical proxy data to orbital parameters revealed that the upper 247.8 m represent the last 637 kyr. The multi-proxy dataset covering these 637 kyr indicates long-term variability, with a change from cooler and wetter to drier and warmer glacial and interglacial periods around 300 ka. Short-term environmental change caused, for example, by tephra deposition or the climatic impact of millennial-scale Dansgaard-Oeschger and Heinrich events are superimposed on the long-term trends. Evolutionary studies on the extant fauna indicate that Lake Ohrid was not a refugial area for regional freshwater animals. This differs from the surrounding catchment, where the mountainous setting with relatively high water availability provided a refugial area for temperate and montane trees during the relatively cold and dry glacial periods. Although Lake Ohrid experienced significant environmental change over the last 637 kyr, preliminary molecular data from extant microgastropod species do not indicate significant changes in diversification rate during this period. The reasons for this constant rate remain largely unknown, but a possible lack of environmentally induced extinction events in Lake Ohrid and/or the high resilience of the ecosystems may have played a role.

Sign in / Sign up

Export Citation Format

Share Document