Results 81 to 90 of about 11,809 (204)

Research on the Mechanism and Suppression Method of Gas Migration Velocity Under Gas Invasion Conditions in Ultra‐Deep Well Drilling

Energy Science &Engineering, Volume 14, Issue 1, Page 460-474, January 2026.
ABSTRACT During ultra‐deep well drilling, the narrow safety density window of the drilling fluid makes it prone to complex conditions such as gas invasion. The high‐temperature and high‐pressure environment causes changes in the properties of the drilling fluid, making the gas invasion process highly covert and increasing the difficulty of well control.
Meipeng Ren, Lichen Guan, Deqiang Tian, Jun Li, Hua Guo, Hongwei Yang, Zhenyu Long   +6 more
wiley   +1 more source

Borehole stability in naturally fractured rocks with drilling mud intrusion and associated fracture strength weakening: A coupled DFN-DEM approach

Journal of Rock Mechanics and Geotechnical Engineering
Borehole instability in naturally fractured rocks poses significant challenges to drilling. Drilling mud invades the surrounding formations through natural fractures under the difference between the wellbore pressure (Pw) and pore pressure (Pp) during ...
Yaoran Wei, Yongcun Feng, Zhenlai Tan, Tianyu Yang, Xiaorong Li, Zhiyue Dai, Jingen Deng   +6 more
doaj   +1 more source

Characterization of Shale-Drilling Fluid Interaction Mechanisms Related to Wellbore Instability

Journal of King Saud University: Engineering Sciences, 1996
Wellbore stability problems tend to occur during the drilling phase in shale sections, hence the understanding of shale-drilling fluid interaction mechanisms is essential if wellbore instability is to be avoided when drilling through shale sections.
Musaed N.J. Al-Awad, B.G.D. Smart
doaj   +1 more source

Premiminary tests on modified clays for electrolyte contaminated drilling fluids [PDF]

, 2015
The quality of a bentonite suspension declines in aggressive systems like brackish or saline pore water. An engineered clay (HYPER clay) was developed for sealing materials with enhanced resistance to aggressive conditions.
Bezuijen, Adam, den Hamer, Davina, Di Emidio, Gemmina, Verastegui Flores, Daniel   +3 more
core   +1 more source

Enhancing drilling operations: prioritizing wellbore integrity, formation preservation, and effective mud waste control (case study)

Journal of Engineering and Applied Science
This study examined the issues of wellbore instability encountered during the drilling of the vertical exploration Al-Rateena-1 well, Block 25D, Al-Rawat Field, Sudan.
Ahmed Abdelaziz Ibrahim Elrayah
doaj   +1 more source

Thermo-poroelastic analysis of drilling fluid pressure and temperature on wellbore stresses in the Mansouri oilfield, SW Iran

Results in Earth Sciences
Ensuring wellbore stability is essential for successful oilfield drilling operations, as instability can prolong drilling time and escalate costs, potentially resulting in halted operations and loss of wells.
Alireza Pirhadi, Pooria Kianoush, Shahab Varkouhi, Reza Shirinabadi, Adel Shirazy, Aref Shirazi, Arash Ebrahimabadi   +6 more
doaj   +1 more source

Borehole stability analysis in a thermoporoelastic dual-porosity medium

, 2012
International audienceThe problem of diffusion and mass transfer in dual porous media is considered in a threephase framework. The solid phase is assumed to contain two distinct cavities filled with fluid.
Gelet, Rachel, Khalili, Nasser, Loret, Benjamin   +2 more
core   +3 more sources

Research on vertical structure stability before cementing ultra-deep wellbore by drilling method

Meitan xuebao
To address the problem of vertical stability of ultra-deep wellbore by drilling method, firstly, the results of the equation of critical height of equal section for non-full counterweighted water drilled wellbore are compared with the results of the ...
Renliang SHAN, Tianyu HAN, Guoye JING, Jie TAN, Weijie LI, Dongjie QIAO, Zhenyu XU, Xinpeng FU   +7 more
doaj   +1 more source

Analytic Modelling for Wellbore Stability Analysis

Procedia Structural Integrity, 2017
Abstract 1D geomechanical model based on cross-dipole wideband acoustic logging for unconventional reservoir is calculated. TIV anisotropic zones were highlighted and corresponding anisotropic elastic properties were confirmed by core samples tests.
A. Martemyanov, S. Lukin, Yu. Ovcharenko, V. Zhukov, Yu. Andrianov, S. Vereshchagin, A. Eremeev, A. Konchenko, O. Tatur, A. Yuferova   +9 more
openaire   +1 more source

Model of horizontal stress in the Aigion10 well (Corinth) calculated from acoustic body waves

, 2006
In this paper we try to deduce the in situ stresses from the monopole acoustic waves of the well AIG10 between 689 and 1004 meters in depth (Corinth Golf).
Rousseau, André
core   +1 more source