Continental Scientific Drilling — A Scientific Frontier

1988 ◽  
pp. 9-9
Author(s):  
F. G. Stehli
Keyword(s):  
Scientific Drilling

Observations on dynamic tensions of drill string during drilling operations of scientific drilling vessel Chikyu

OCEANS 2009 ◽  
2009 ◽  
Author(s):  
Tomoya Inoue ◽  
Masahiko Ozaki ◽  
Kazuyasu Wada
Keyword(s):  
Drill String ◽  
Scientific Drilling ◽  
Drilling Operations

Salton Sea Scientific Drilling Project; on-site science management; California

1986 ◽  
Author(s):  
J.H. Sass ◽  
S.S. Priest ◽  
L.C. Robison ◽  
J.D. Hendricks
Keyword(s):  
Salton Sea ◽  
Scientific Drilling ◽  
Science Management ◽  
Drilling Project

THE NECESSITY OF SCIENTIFIC DRILLING FOR RECOGNITION OF PERMO-TRIASSIC CONTINENTAL ECOSYSTEMS OF EQUATORIAL PANGEA

2019 ◽  
Author(s):  
Kathleen C. Benison ◽  
◽  
Anna Sofia Andeskie ◽  
James J. Zambito
Keyword(s):  
Scientific Drilling

Microfacies of Deep-water Deposits and Forming Models of the Chinese Continental Scientific Drilling-SKII

2007 ◽  
Vol 81 (6) ◽  
pp. 1026-1032 ◽  
Author(s):  
CHENG Rihui ◽  
WANG Guodong ◽  
WANG Pujun ◽  
GAO Youfeng
Keyword(s):  
Deep Water ◽  
Scientific Drilling

scholarly journals Review of Recent Drilling Projects in Unconventional Geothermal Resources at Campi Flegrei Caldera, Cornubian Batholith and Williston Sedimentary Basin

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3306
Author(s):  
Renato Somma ◽  
Daniela Blessent ◽  
Jasmin Raymond ◽  
Madeline Constance ◽  
Lucy Cotton ◽  
...  
Keyword(s):  
Renewable Energy Sources ◽  
Lessons Learned ◽  
Campi Flegrei ◽  
Geothermal Resources ◽  
Scientific Drilling ◽  
Pilot Hole ◽  
The United Kingdom ◽  
Extensional Faulting ◽  
Drilling Site ◽  
Drilling Project

Unconventional geothermal resource development can contribute to increase power generation from renewable energy sources in countries without conventional hydrothermal reservoirs, which are usually associated with magmatic activity and extensional faulting, as well as to expand the generation in those regions where conventional resources are already used. Three recent drilling experiences focused on the characterization of unconventional resources are described and compared: the Campi Flegrei Deep Drilling Project (CFDDP) in Italy, the United Downs Deep Geothermal Power (UDDGP) project in the United Kingdom, and the DEEP Earth Energy Production in Canada. The main aspects of each project are described (geology, drilling, data collection, communication strategies) and compared to discuss challenges encountered at the tree sites considered, including a scientific drilling project (CFDDP) and two industrial ones (UDDGP and DEEP). The first project, at the first stage of pilot hole, although not reaching deep supercritical targets, showed extremely high, very rare thermal gradients even at shallow depths. Although each project has its own history, as well as social and economic context, the lessons learned at each drilling site can be used to further facilitate geothermal energy development.

Preliminary Study on Stick-Slip in Drillstring With Analytical Model Expressed With Neutral Delay Differential Equation

2014 ◽  
Author(s):  
Tomoya Inoue ◽  
Tokihiro Katsui ◽  
Chang-Kyu Rheem ◽  
Zengo Yoshida ◽  
Miki Y. Matsuo
Keyword(s):  
Differential Equation ◽  
Analytical Model ◽  
Delay Differential Equation ◽  
Drill Bit ◽  
Neutral Delay ◽  
Stick Slip ◽  
Scientific Drilling ◽  
Neutral Delay Differential Equation ◽  
Delay Differential ◽  
Slip Phenomenon

Stick-slip is a major problem in offshore drilling because it may cause damage to the drill bit as well as crushing or grinding the sediment layer, which is crucial problem in scientific drilling because the purpose of the scientific drilling is to recover core samples from the layers. To mitigate stick-slip, first of all it is necessary to establish a model of the torsional motion of the drill bit and express the stick-slip phenomenon. Toward this end, the present study proposes a model of torsional waves propagating in a drillstring. An analytical model is developed and used to derive a neutral delay differential equation (NDDE), a special type of equation that requires time history, and an analytical model of stick-slip is derived for friction models between the drill bit and the layer as well as the rotation speed applied to the uppermost part of the drill string. In this study, the stick-slip model is numerically analyzed for several conditions and a time series of the bit motions is obtained. Based on the analytical results, the appearance of stick-slip and its severity are discussed. A small-scale model experiment was conducted in a water tank to observe the stick-slip phenomenon, and the result is discussed with numerical analysis. In addition, utilizing surface drilling data acquired from the actual drilling operations of the scientific drillship Chikyu, occurrence of stick-slip phenomenon is discussed.

scholarly journals 40Ar/39Ar ages for deep (∼3.3 km) samples from the Hawaii Scientific Drilling Project, Mauna Kea volcano, Hawaii

2012 ◽  
Vol 13 ◽  
Author(s):  
Fred Jourdan ◽  
Warren D. Sharp ◽  
Paul R. Renne
Keyword(s):  
Scientific Drilling ◽  
Drilling Project

Valles Caldera region, New Mexico, and the emerging continental scientific drilling program

1988 ◽  
Vol 93 (B6) ◽  
pp. 5997 ◽  
Author(s):  
Fraser Goff ◽  
Jamie N. Gardner
Keyword(s):  
New Mexico ◽  
Valles Caldera ◽  
Scientific Drilling
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