Methods of test for determination of d.c. magnetic properties of magnetic materials

1981 ◽  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials

Direction Drilling Measurement Errors Caused by Drilling Fluid Constituents

2016 ◽  
Author(s):  
Giorgio Pattarini ◽  
Sheldon Rawlins ◽  
Arild Saasen ◽  
Per Amund Amundsen ◽  
Benny Poedjono
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Geomagnetic Field ◽  
Measurement Errors ◽  
Drilling Fluid ◽  
Shielding Effect ◽  
Measurement While Drilling ◽  
Drilling Muds ◽  
Shielding Effects

Materials in drilling muds are known to sometimes distort the geomagnetic field at the location of the Measurement While Drilling (MWD) tool magnetometers that are used to measure the azimuth of well path. This distortion or shielding effect can contribute to substantial errors in determination of azimuth while drilling deviated wells and with significant well displacements, these errors may result in missing the target of a long deviated section in the range of 1–200m; and thus impact on the overall productivity expectation of the well. The article describes significant shielding effects observed while drilling long wells. The criteria for acceptance of the surveys were not met and resultantly, an alternative survey source had to be obtained with resulted in increased cost and time to the client. A number of measures were implemented to eliminate this shielding effect. The effects of drilling fluid contamination by magnetic materials are calculated, and a method to evaluate the magnetic properties of the drilling fluid is proposed. The effect of taking measurements with the pumps on versus off is quantified.

scholarly journals Probing nanoscale behavior of magnetic materials with soft X-ray spectromicroscopy

2012 ◽  
Vol 1 (1) ◽  
pp. 5-15 ◽  
Author(s):  
Peter Fischer ◽  
Charles S. Fadley
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Spin Dynamics ◽  
Magnetic Nanostructures ◽  
Magnetic Behavior ◽  
Research Area ◽  
X Ray ◽  
Spatially Resolved ◽  
Buried Interfaces ◽  
Analytical Tools

AbstractThe magnetic properties of matter continue to be a vibrant research area driven both by scientific curiosity to unravel the basic physical processes which govern magnetism and the vast and diverse utilization of magnetic materials in current and future devices, e.g., in information and sensor technologies. Relevant length and time scales approach fundamental limits of magnetism and with state-of-the-art synthesis approaches we are able to create and tailor unprecedented properties. Novel analytical tools are required to match these advances and soft X-ray probes are among the most promising ones. Strong and element-specific magnetic X-ray dichroism effects as well as the nanometer wavelength of photons and the availability of fsec short and intense X-ray pulses at upcoming X-ray sources enable unique experimental opportunities for the study of magnetic behavior. This article provides an overview of recent achievements and future perspectives in magnetic soft X-ray spectromicroscopies which permit us to gain spatially resolved insight into the ultrafast spin dynamics and the magnetic properties of buried interfaces of advanced magnetic nanostructures.

Tuning magnetism at the two-dimensional limit: A theoretical perspective

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongzhe Li ◽  
Shuo Li ◽  
Chengyong Zhong ◽  
Junjie He
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Recent Progress ◽  
Theoretical Perspective ◽  
Two Dimensional

The discovery of two-dimensional (2D) magnetic materials provides an ideal testbed for manipulating the magnetic properties at the atomically thin and the 2D limit. This review gives recent progress on...

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