Results 21 to 30 of about 166,367,160 (262)

Effect of piezocone penetration rate on the classification of Norweian silt [PDF]

, 2018
Interpretation of Cone Penetration Tests (CPTU) in intermediate soils is complex due to partially drained conditions during penetration. In order to gain more insight into the material behavior of silt during a CPTU, an intensive test program was carried
Long, Michael, Bihs, Annika, Gylland, Anders Samstad, Paniagua Lopez, Ana Priscilla, Nordal, Steinar   +4 more
core   +2 more sources

DEVELOPMENT OF OIL WELL MONITORING AND CONTROL SYSTEM

Academy Journal of Science and Engineering, 2022
Kick is an unplanned and undesirable influx of formation fluid into the borehole which if not curtailed, may develop into a blowout. It may arise if the formation fluid flows into the wellbore in an unplanned fa shion when the drilling mud hydrostatic ...
E. J. Atajeromavwo, G. B. Iwasokun, O. C. Akinyokun, A.O Adetunbi   +3 more
doaj  

Rate of Penetration Optimization using Moving Horizon Estimation [PDF]

Modeling, Identification and Control, 2016
Increase of drilling safety and reduction of drilling operation costs, especially improvement of drilling efficiency, are two important considerations in the oil and gas industry. The rate of penetration (ROP, alternatively called as drilling speed) is
Dan Sui, Bernt Sigve Aadnøy
doaj   +1 more source

Simulation of CPT penetration in sensitive clay [PDF]

, 2022
This paper presents the results from numerical simulations of CPTu penetration in a natural clay combining the SCLAY1S constitutive model with a large deformation Finite Element framework including a coupled deformation and porewater pressure formulation.
Dijkstra, Jelke,, Yannie, Jorge,, Isaksson, Jonatan, Karlsson, Mats, Karlsson, Mats,, Dijkstra, Jelke, Yannie, Jorge, Isaksson, Jonatan,   +7 more
core   +1 more source

Well-seismic joint data-driven resistivity-based prediction of 3D spatial rate of penetration

Frontiers in Earth Science
Accurate rate of penetration (ROP) prediction is important for optimizing drilling parameters, selecting drilling tools, improving drilling efficiency, and reducing operation cost.
Yangfei Yu, Yangfei Yu, Shouceng Tian, Jianguo Li, Lingzhan Zou, Gang Liu, Pengfei Li, Wei Zhou, Yang Lu   +8 more
doaj   +1 more source

Evaluating the maximum rate of penetration for drilling borehole in soft coal seam

Energy Science & Engineering, 2020
Most coal seams in China are characterized by high‐gas pressure and high‐gas content, which seriously threaten the safety of coal mines. Gas extraction is an effective measure for preventing gas disasters. However, the drilling process in soft coal seams
Shuo Yang, Guangcai Wen, Fazhi Yan, Mingjie Zhang, Xusheng Zhao   +4 more
doaj   +1 more source

A Novel Rate of Penetration Prediction Model Integrating Log-Derived Geomechanical Properties and Physically Motivated Energy Parameters for Heterogeneous Formations

Applied Sciences
Accurate rate of penetration (ROP) prediction in heterogeneous formations remains a key challenge for drilling optimization, as existing empirical models rely on fixed-structure coefficients unable to adapt to rapid lithological transitions.
Ahmed S. Alhalboosi, Musaed N. J. AlAwad, Mohammed A. Khamis   +2 more
doaj   +1 more source

Drill Bit Selection in Yubei Block Based on Factor Analysis

Shiyou jixie, 2021
The drill bit used in the field has a poor matching degree with the drilled formation, resulting in slow ROP. It is necessary to supplement the selection factors based on the conventional bit selection method by considering the influence of hydraulic ...
Cheng Haoyu, Zhang Yan, Lou Yishan, Xie Jing, Liu Zhe   +4 more
doaj  

Social Functioning Within the First Years After Pediatric Brain Tumor Diagnosis and the Relationship With Family Psychosocial Risk

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Survivors of pediatric brain tumors (PBTs) can experience long‐term social difficulties, impacting quality of life. Beyond medical and environmental factors, family psychosocial risk may play a role in social outcomes by shaping the caregiving environment and may provide intervention options.
Renske H. Houben, Marisa H. Huisman, Martha A. Grootenhuis, Femke K. Aarsen, Marita Partanen   +4 more
wiley   +1 more source

Penetration of fastener projectiles into construction materials [PDF]

, 1988
The normal impact, penetration of both projectile and fastener into soils, rocks, and concrete at low velocities has been investigated using theoretical, experimental, and numerical approaches under axisymmetric conditions.
Zhou, Gang
core