Results 211 to 220 of about 34,203 (251)

Borehole stability of multilateral junctions

Journal of Petroleum Science and Engineering, 1999
Abstract The number of multi-lateral wells are increasing in the North Sea area. Potential for improved accessibility and recovery has led to a significant interest both from oil companies and the service industry. With improved technology, these multi-lateral branches will be key elements in the development of the so called "smart ...
Bernt Aadnøy, Cecilie Edland
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Borehole Design: Stability Considerations

SPE/ISRM Rock Mechanics Conference, 2002
Abstract In recent years drilling for hydrocarbons have become a much more challenging task as nice, blanket-type reservoirs are now part of history and appear mostly in textbooks and old reports. The current economic and political world environment demands fewer, more "difficult" wells to be drilled and produced.
Gil Ivan, Roegiers Jean-Claude
openaire   +1 more source

Stability of adjacent boreholes

Journal of Petroleum Science and Engineering, 1991
Abstract A model has been derived to investigate changes in critical borehole fracturing and collapse pressures when drilling a well adjacent to another well. The results show no significant effect on the fracturing pressure. The critical borehole collapse pressure, however, will increase with two adjacent holes.
Bernt Sigve Aadnoy, Tor Syvert Froitland
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Borehole Stability in Shales

SPE Drilling & Completion, 1994
Summary Downhole mud/shale interaction can only be properly understood if rock mechanical, shale hydration, and fluid transport phenomena are taken into account. This paper presents a review of Koninklijke Shell E&P Laboratorium's research on borehole stability in shales.
G. M. Bol, S-W. Wong, C. J. Davidson, D. C. Woodland   +3 more
openaire   +1 more source

Borehole Stability Analysis For Underbalanced Drilling

Annual Technical Meeting, 1999
Abstract Underbalanced drilling techniques are often considered to avoid or mitigate formation damage, reduce lost circulation risk, and increase drilling rate of penetration. However, drilling with a bottomhole pressure less than the formation pore pressure will usually increase the risk of borehole instability due
P. McLellan, C. Hawkes
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Stability of Highly Inclined Boreholes

SPE Drilling Engineering, 1987
Summary Hole inclination produces alterations in the stress state around the borehole and in the physical properties of the rock. Depending on specific conditions, such effects may lead to collapse of the borehole or a reduction in the fracture-initiation pressure. This paper shows how to determine such effects through the application of
B. S. Aadnoy, M. E. Chenevert
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The temperature stabilization of a borehole

GEOPHYSICS, 1981
Analytic solutions for the temperature stabilization of both square and circular boreholes are considered. It is found that a previously published solution for a square borehole is incorrect in that it does not reproduce the initially assumed conditions.
Y. Leblanc, L. J. Pascoe, F. W. Jones
openaire   +1 more source

Borehole Stability in High-Temperature Formations

Rock Mechanics and Rock Engineering, 2013
In oil and gas drilling or geothermal well drilling, the temperature difference between the drilling fluid and formation will lead to an apparent temperature change around the borehole, which will influence the stress state around the borehole and tend to cause borehole instability in high geothermal gradient formations.
Chuanliang Yan, Jingen Deng, Baohua Yu, Wenliang Li, Zijian Chen, Lianbo Hu, Yang Li   +6 more
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Stress and borehole stability: Theoretical, practical tools and results

Revue européenne de génie civil, 2006
ABSTRACT Borehole and wellbore stability is a fundamental issue for natural resources production (hydrocarbons, water) as well as for subsurface storage and for scientific boreholes. This issue involves the in situ state of stress (often poorly known), rock mechanics behaviour, and drilling procedures.
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Influence of anisotropies in borehole stability

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1993
Abstract This paper discusses an anisotropic model for assessing the mechanical stability of a deep borehole subjected to an internal wellbore pressure and a far-field stress tensor. The model consists of a three-dimensional stress analysis around an inclined borehole combined with a generalized three-dimensional anisotropic strength criterion for ...
S.H. Ong, J.-C. Roegiers
openaire   +1 more source