Results 41 to 50 of about 945,774 (394)

A Novel Amphoteric Polymer as a Rheology Enhancer and Fluid-Loss Control Agent for Water-Based Drilling Muds at Elevated Temperatures

ACS Omega, 2020
Exploring deep and ultradeep wells has rapidly become more significant to meet the global demand for oil and gas. The study of rheological and filtration-loss properties is essential to designing drilling muds and determining their performance under ...
B. Hamad, Miao He, Mingbiao Xu, Weihong Liu, Musa Mpelwa, Shanfa Tang, Lijun Jin, Jian-jian Song   +7 more
semanticscholar   +1 more source

Magnetic Interference Correction Method for Dynamic Measurement of Steering Head and Its Application

Shiyou jixie
During the operation of the rotary steering system， the magnetic interference faced by the steering head when performing dynamic measurement tasks mainly comes from two aspects： one is the magnetic influence of the internal current fluctuation of the M30
Zhu Jinsong, Song Xiaojian, Yu Yanfei, Zhang Suosheng, Jiang Qihong, Zheng Bangxian, Chen Jingwang   +6 more
doaj   +1 more source

Microfracture Versus Drilling of Articular Cartilage Defects: A Systematic Review of the Basic Science Evidence

Orthopaedic Journal of Sports Medicine, 2020
Background: Microfracture (MFx) is one of the most common techniques used for the treatment of articular cartilage defects, although recently there has been a trend toward the use of drilling rather than MFx for the treatment of these defects.
M. Kraeutler, G. Aliberti, A. Scillia, E. McCarty, M. Mulcahey   +4 more
semanticscholar   +1 more source

Development and Application of Drilling Shock Absorption and Stabilization Tool

Shiyou jixie
During drilling in medium to deep strata， the complexity and poor drillability of these formations may lead to buckling and jumping of drilling tool， resonance fatigue of drill string， and low drilling efficiency.
Guan Yanlei, Zhao Jincheng, Liu Xiaojun, Chen Jie, Liu Huawei, Chen Liwei, Ren Zhiwei   +6 more
doaj   +1 more source

Drilling Burr Minimization by Changing Drill Geometry [PDF]

Materials, 2020
This article presents an attempt to solve the problem of the formation of burrs and drilling caps in the process of drilling in difficult-to-cut materials, specifically in the titanium alloy Ti-6Al-4V. In order to eliminate these phenomena, a chamfer of specific length and angle was made on FANAR drill’s margin.
Emilia Franczyk, Łukasz Ślusarczyk, Wojciech Zębala   +2 more
openaire   +2 more sources

Shale problems and water-based drilling fluid optimisation in the Hassi Messaoud Algerian oil field [PDF]

, 2010
Drilling fluid formulation and properties play a fundamental role in drilling operations. Clay minerals behave initially as a beneficial rheological adjuvant in drilling muds.
Benmounah, Abdelbaki, Bergaya, Faiza, Canselier, Jean-Paul, Cohaut, Nathalie, Fourar, Karim, Khodja, Malika, Khodja, Mohamed   +6 more
core   +2 more sources

Single cis‐elements in brassinosteroid‐induced upregulated genes are insufficient to recruit both redox states of the BIL1/BZR1 DNA‐binding domain

FEBS Letters, EarlyView.
Phytohormone brassinosteroid‐induced gene regulation by the transcription factor BIL1/BZR1 involves redox‐dependent DNA‐binding alternation and interaction with the transcription factor PIF4. The reduced BIL1/BZR1 dimer binds preferred cis‐elements, while oxidation alters its oligomerization state and disrupts DNA‐binding ability.
Shohei Nosaki, Masae Ohtsuka, Takeshi Nakano, Masaru Tanokura, Takuya Miyakawa   +4 more
wiley   +1 more source

C9orf72 ALS‐causing mutations lead to mislocalization and aggregation of nucleoporin Nup107 into stress granules

FEBS Letters, EarlyView.
Mutations in the C9orf72 gene represent the most common genetic cause of amyotrophic lateral sclerosis (ALS), a fatal neurodegenerative disease. Using patient‐derived neurons and C. elegans models, we find that the nucleoporin Nup107 is dysregulated in C9orf72‐associated ALS. Conversely, reducing Nup107 levels mitigates disease‐related changes.
Saygın Bilican, Yara Nabawi, William Hongyu Zhang, Dunja Petrovic, Markus Wehrmann, Sara Muñoz‐García, Seda Koyuncu, David Vilchez   +7 more
wiley   +1 more source

Wood wasp inspired space and earth drill [PDF]

, 2010
In this chapter, we explain why the low gravity encountered on Mars or on the Moon and the low mass of the probes, landers and rovers that carry drilling devices limit classical drilling techniques.
Coste, Pierre, Gao, Yang, Gouache, Thibault, Gourinat, Yves   +3 more
core  

Rad27/FEN1 prevents accumulation of Okazaki fragments and ribosomal DNA copy number changes

FEBS Letters, EarlyView.
The budding yeast Rad27 is a structure‐specific endonuclease. Here, the authors reveal that Rad27 is crucial for maintaining the stability of the ribosomal RNA gene (rDNA) region. Rad27 deficiency leads to the accumulation of Okazaki fragments and changes in rDNA copy number.
Tsugumi Yamaji, Yuko Katayama, Nanase Arata, Mariko Sasaki   +3 more
wiley   +1 more source