Results 151 to 160 of about 34,329 (209)

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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

Borehole Stability in Shale: Beyond Mud Weight

IADC/SPE International Drilling Conference and Exhibition, 2020
Abstract Several wells in the Gulf of Mexico were analyzed to understand the source of shale instability during drilling and wireline operations. In spite of the mud weight being above the borehole collapse pressure, the wells still exhibited signs of shale instability. As such, it was evident that another mechanism was playing a role in
Ewerton Araujo, Darren Kisinger, Daniel Vidal, Barry Cresap   +3 more
openaire   +1 more source

Uncertainty Analysis of Borehole Stability Problems

SPE Annual Technical Conference and Exhibition, 1995
Abstract An uncertainty analysis is conducted for borehole stability problems based on a statistical error analysis method. The uncertainty analysis shows that the parameters impacting on the safe mud weight to stabilize borehoie are rock strength followed by shale swelling, in-situ stress, pore pressure, well inclination, and so on ...
openaire   +1 more source