Results 51 to 60 of about 504,172 (167)

iS‐GNN: Interpolation of Crustal Stress Maps Using a Graph Neural Network Model

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract Estimating the orientation of the maximum horizontal stress (SHmax) from sparse and unevenly distributed geophysical observations remains a persistent challenge in tectonic and geomechanical stress studies. Classical interpolation methods often neglect the multiscale tectonic–geological heterogeneity of the crust, leading to biased estimates ...
Kwame A. Gyamfi, Michele M. C. Carafa
wiley   +1 more source

Alkali Solution Erodes Shale: Influencing Factors and Structural Damage Characteristics

Journal of Chemistry, 2018
High-pH drilling fluids are often used for drilling shale gas wells. Alkali erosion of shale is one of the important factors of wellbore instability.
Jiping She, Hao Zhang, Ying Zhong, Yang Yuan, Jiachun You   +4 more
doaj   +1 more source

Optimized Selenium‐Doped Nanocomposites for Enhanced Polymer Gel Performance in Permeability Reduction

Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 4, July/August 2026.
ABSTRACT Excessive water production in mature oil fields necessitates robust shut‐off treatments, yet conventional polymer gels often fail under high‐temperature and high‐salinity conditions. This study aims to enhance gel thermal stability and mechanical strength by incorporating selenium‐doped Ag/AgO–ZnO nanocomposites synthesized via a novel green ...
Fadhil F. Sead, Farag M. A. Altalbawy, M. Sudhakara Reddy, Badri Narayan Sahu, Sridharan Sundharam, Sanjeev Kumar, Atreyi Pramanik, Aseel Smerat, Fatimah Pashtun   +8 more
wiley   +1 more source

Visualizing Wellbore Instability and Fracture Direction by Application of Principal Stress Trajectory Analysis [PDF]

, 2018
This study furthers our understanding of the causes of wellbore failure by thoroughly analyzing key properties (e.g., in-situ stress regime, formation and pore pressures, and rock properties) associated with wellbore instability.
Thomas, Ned C
core   +2 more sources

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

Synergistic Physicochemical Inhibition of Reactive Shale Formations Using Hydrothermally Synthesized Hydroxyapatite Nickel Tungstate Nanocomposites in Water‐Based Drilling Fluids

Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 4, July/August 2026.
ABSTRACT Wellbore instability driven by the volumetric expansion of reactive shale formations remains a primary operational challenge in modern drilling engineering, causing severe mechanical failures and substantial economic deficits. The objective of this study is to formulate and evaluate a novel dual‐action chemical additive capable of ...
Ghaleb Oriquat, Basim Abdul Alrhym, A. C. Umamaheshwer Rao, Shivam P. Chaudhary, Pardeep Singh Bains, Ripendeep Singh, Murotov Nurshod, Rasulbek Eshmetov, Ahmad Abumalek   +8 more
wiley   +1 more source

Study of wellbore instability in shale formation considering the effect of hydration on strength weakening

Frontiers in Earth Science
Shale formations often contain a high proportion of clay minerals, which, upon contact with drilling fluid, undergo hydration expansion. This leads to wellbore instability, a problem that poses significant challenges globally.
Shaopeng Li, Peng Zhou, Baofeng Lan
doaj   +1 more source

Nanoparticle‐Assisted Polymer Flooding for Enhanced Oil Recovery: Condition‐Specific Mechanisms, Modeling Reliability, and Field‐Scale Translation

Engineering Reports, Volume 8, Issue 7, July 2026.
Nanoparticle‐assisted polymer flooding (NAPPF) strengthens polymer EOR by improving rheological stability, reducing interfacial tension, altering wettability, and lowering polymer adsorption/retention, delivering 15%–30% incremental recovery in lab studies and up to ˜22% in pilots.
R. Venkatesh, Kuwar Mausam, M. Brahmaraju, Komal Parashar, Subrahmanya Ranjit Pasupuleti, Madhur Grover, Sagayaraj Pappu, Ramya Maranan, Madaminov Sanjarbek Maxmudjon Ugli, Rajkumar Sivanraju   +9 more
wiley   +1 more source

Experimental Study of Wellbore Instability in Clays

, 2010
This paper presents the results of an extensive program of laboratory model wellbore tests that have been performed to study wellbore instability in saturated clays.
Abdulhadi, Naeem O., Whittle, Andrew, Germaine, John T., John T. Germaine, Naeem O. Abdulhadi, Andrew J. Whittle   +5 more
core   +1 more source

Microemulsion‐Based Drilling Fluids Incorporating Seashell Residue Powder: A Sustainable Approach to Fluid Loss Control

Journal of Surfactants and Detergents, Volume 29, Issue 4, Page 537-547, July 2026.
Two microemulsion‐based drilling fluids incorporating SSRP were formulated using pine oil, the nonionic surfactant Alkonat L100W, and a glycerol/water solution. The results provide valuable insights into how surfactant‐assisted microemulsion systems can be engineered to enhance the performance and eco‐efficiency of drilling fluids.
Luara Ribeiro Viana, Raphael Ribeiro da Silva, João Pedro Gonçalves de Souza Soares, José Cavalcante de Queiroz Neto, Maria Eduarda Araújo Pessoa, Rafael Peixoto Alves, Fabiola Dias da Silva Curbelo   +6 more
wiley   +1 more source