Results 111 to 120 of about 284 (138)
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Analysis of Transient Electromagnetic Response for the Borehole to Airborne Survey Mode
Radio ScienceAbstract This paper proposes a novel borehole to airborne survey mode for electromagnetic method by integrating the advantages of borehole excitation and airborne observation, which is applicable to the exploration of oil and gas reservoirs.
Liting Rao, Guoqiang Xue, Bo Dang
exaly +2 more sources
Springer Series in Geomechanics and Geoengineering, 2021
Borehole transient electromagnetic (TEM) techniques are widely used for nondestructive evaluation (NDE) of oil & gas well casings with eddy-current diffusion properties. In this paper, we present a multiple-eccentric-sensor-based borehole TEM system for NDE of downhole casings.
Bo Dang, Dang Bo
exaly +2 more sources
Borehole transient electromagnetic (TEM) techniques are widely used for nondestructive evaluation (NDE) of oil & gas well casings with eddy-current diffusion properties. In this paper, we present a multiple-eccentric-sensor-based borehole TEM system for NDE of downhole casings.
Bo Dang, Dang Bo
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Geophysics, 2014
ABSTRACT A newly developed helicopter transient electromagnetic (TEM) system has the ability to measure very early times within just a few μs after the turn off of the primary current. For such a system, careful calibration and accurate modeling of the electromagnetic (EM) response is critical to get true resistivities of the very ...
Cyril Schamper +2 more
exaly +2 more sources
ABSTRACT A newly developed helicopter transient electromagnetic (TEM) system has the ability to measure very early times within just a few μs after the turn off of the primary current. For such a system, careful calibration and accurate modeling of the electromagnetic (EM) response is critical to get true resistivities of the very ...
Cyril Schamper +2 more
exaly +2 more sources
Borehole transient electromagnetic response calculation and experimental study in coal mine tunnels
Measurement Science and TechnologyAbstract Water damage seriously threatens the safe production of coal mines, so it is necessary to carry out advanced detection to determine the hydrogeological situation, and the preliminary survey often involves the drilling of on-site drill holes in the tunnel.
Xiaofeng Yi
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Geophysics, 2001
Abstract Large-loop electromagnetic (EM) systems that measure transient EM (TEM) data on the surface or in boreholes have shown increased application in exploration geophysics. Accurate interpretation of borehole TEM data is necessary to discover deep hidden targets that cannot be detected with surface systems.
Z. Zhang, J. Xiao
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Abstract Large-loop electromagnetic (EM) systems that measure transient EM (TEM) data on the surface or in boreholes have shown increased application in exploration geophysics. Accurate interpretation of borehole TEM data is necessary to discover deep hidden targets that cannot be detected with surface systems.
Z. Zhang, J. Xiao
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Application of Borehole Transient Electromagnetic System in Relief Well Drilling: a Case Study
2021 3rd International Conference on Intelligent Control, Measurement and Signal Processing and Intelligent Oil Field (ICMSP), 2021In the process of offshore and land drilling, once the blowout out of accident occurs, oil and gas resources will be seriously damaged, which will be easy to cause catastrophic events such as casualties and environmental pollution. Drilling a relief well beyond a certain distance around the blowout well to achieve connection is an effective way to ...
Liu Changzan +3 more
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Effect of conductive host rock on borehole transient electromagnetic responses
Geophysics, 1989Abstract Transient electromagnetic (TEM) borehole responses of 3-D vertical and horizontal tabular bodies in a half-space are calculated to assess the effect of a conductive host. The transmitter is a large loop at the surface of the earth, and the receiver measures the time derivative of the vertical magnetic field.
Gregory A. Newman +2 more
openaire +1 more source