Results 41 to 50 of about 118,861 (336)

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

Drilling fluid for drilling permafrost rocks

Bulletin of the Tomsk Polytechnic University Geo Assets Engineering
Relevance. The article provides an overview of the problem of drilling wells for oil and gas in conditions of permafrost. When constructing wells for various purposes in conditions of permafrost rocks, special requirements are imposed on the selection of the optimal drilling fluid.
Alexander Ya. Tretyak, Andrey A. Chumakov, Kirill V. Krivosheev   +2 more
openaire   +2 more sources

Study on Drilling Fluids

Journal of the Japanese Association for Petroleum Technology, 1954
For the purpose of obtaining an effective emulsifier for high pH Lime-emulsion drilling fluid, the humic acid has been researched in our oaboratory, and it has been found that it is superior to other various surface active agents. In this paper the effect of the humic acid upon drilling fluid is described.
Kazuo Iida, Bunkichi Okino
openaire   +3 more sources

Open‐source deep‐learning models for segmentation of normal structures for prostatic and gynecological high‐dose‐rate brachytherapy: Comparison of architectures

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Background The use of deep learning‐based auto‐contouring algorithms in various treatment planning services is increasingly common. There is a notable deficit of commercially or publicly available models trained on large or diverse datasets containing high‐dose‐rate (HDR) brachytherapy treatment scans, leading to poor performance on images ...
Andrew J. Krupien, Yasin Abdulkadir, Dishane C. Luximon, John Charters, Huiming Dong, Jonathan Pham, Dylan O'Connell, Jack Neylon, James M. Lamb   +8 more
wiley   +1 more source

A multibody dynamic model of the drilling system with drilling fluid

Advances in Mechanical Engineering, 2016
This article is intended to present a multibody dynamic model of the drilling system, consisting of drillstring and drilling fluid. The drillstring is a complex rigid–flexible coupling system, including rigid bodies, Euler–Bernoulli beam elements ...
Yanhui Ma, Difeng Hong, Zaibin Cheng, Yanfeng Cao, Gexue Ren   +4 more
doaj   +1 more source

Study on Rice Husk as Lost Circulation Material [PDF]

, 2012
One of the vital factors in successful drilling operation is drilling fluid or also known as mud. Drilling fluid consist of many component. One of the main components is fluid loss control or also known as lost circulation material (LCM).
Mohamad Azir Syazwan Bin Sufri, Mohamad Azir
core  

The influence of water-based drilling fluid on mechanical property of shale and the wellbore stability [PDF]

, 2016
Because of high cost and pollution of oil-based drilling fluid, the water-based drilling fluid is increasingly used now. However, bedding planes and micro-cracks are rich in shale formation.
Ding, Yi, He, Shu, Liang, Lixi, Lin, Yongxue, Liu, Xiangjun, Zeng, Yinjin   +5 more
core   +2 more sources

Improving dose delivery in non‐coplanar cranial SRS: Stereoscopic x‐ray‐guided mitigation of table walkout errors

Journal of Applied Clinical Medical Physics, EarlyView.
Purpose Linear accelerator (LINAC)‐based single‐isocenter multi‐target (SIMT) treatment has streamlined the cranial stereotactic radiosurgery (SRS) workflow. Though efficient, SIMT delivery adds additional challenges that should be considered, including increased sensitivity to rotational errors for off‐isocenter targets.
Yohan A. Walter, Philip F. Durham, Anne N. Hubbard, William E. Burrell, Hsinshun T. Wu   +4 more
wiley   +1 more source

Study of the Rheological Properties of Various Oil-Based Drilling Fluids [PDF]

, 2013
The rheology study of drilling fluid is important to understand the performance of drilling fluid to efficiently remove, transport and suspend cuttings, to maintain a stable wellbore and minimize mud pump requirements.
Leong, Dong Guo
core  

Elasticity of Diametrically Compressed Microfabricated Woodpile Lattices

Advanced Engineering Materials, EarlyView.
Modulus–porosity relationship is derived for woodpile lattices with struts under diametrical compression. The formula presented here that Young's modulus is proportional to the square of the volume fraction E˜ρ2$E \sim \left(\rho\right)^{2}$ is shown to be consistent with computations and laboratory experiments on 3D‐printed samples.
Faezeh Shalchy, Atul Bhaskar
wiley   +1 more source