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Journal Articles
SPE Drill & Compl 35 (04): 553–575.
Paper Number: SPE-199658-PA
Published: 17 December 2020
... to the limit for maximum drilling performance. High‐frequency (HF) continuous recording compact drilling dynamics sensors were embedded into the bit, bit box of the RSS, slow‐rotating housing (SRH) of the RSS, bit box of the mud motor, and top subassembly (sub) of the mud motor to better understand drilling...
Proceedings Papers

Paper presented at the IADC/SPE International Drilling Conference and Exhibition, March 3–5, 2020
Paper Number: SPE-199658-MS
... This paper shows the HFTO and HFAO (high-frequency axial oscillation) observations and HFTO-reduction observations with a motor-assist RSS BHA used in West Texas. Embedded compact high-frequency drilling dynamics recorders were used to acquire actual downhole data at the points of interest (e.g...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3585521
...3D radio-frequency electromagnetic wave modelling with an optimized frequency-domain nite- difference scheme Polina Zheglova , Colin Farquharson and Alison Malcolm, Department of Earth Sciences, Memorial University of Newfoundland, St. John s, NL, Canada SUMMARY using direct factorization...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427119
... waves, which is usually quantified through the coefficient of attenuation (1/Q). Previous studies have shown that fractures affect wave attenuation much more than wave speeds. Attenuation is also enhanced when rocks are partially saturated. At low-frequencies, in partially saturated rocks, the primary...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3417492
... We present a practical and effective method to extrapolate low frequencies on band-limited data. The basis of the extrapolation assumes that missing low-frequency signal is analogous to known higher-frequency signal. This method first derives a multi-channel prediction filter from known higher...
Proceedings Papers

Paper presented at the IADC/SPE International Drilling Conference and Exhibition, March 3–5, 2020
Paper Number: SPE-199680-MS
... and well-known torsional oscillation that usually occurs at low frequencies <1 Hz. High-frequency torsional oscillations (HFTO) are also recorded in the field by using high-bandwidth downhole vibration monitoring tools. HFTO occurs at much higher frequencies; >10Hz to 500 Hz. This paper summarizes...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215068
... ABSTRACT We propose a method to de-noise the low frequency data below 4 Hz using prediction error filter estimated from the high frequency data which has a higher signal-to-noise ratio. Such filter optimally captures the multi-dimensional spectrum of the data. Via axes dilation, the prediction...
Proceedings Papers

Paper presented at the SPWLA 24th Formation Evaluation Symposium of Japan, October 11–12, 2018
Paper Number: SPWLA-JFES-2018-P
... of the data acquisition in the siliciclastic formations was high-definition resistivity borehole images, the radial laterolog resistivity response was also of interest. An advanced wireline multi-frequency dielectric measurement was also acquired, and its response was used for comparison and validation...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-187173-MS
... to a rotational speed that may be several times the surface RPM. The frequency of stick-slip is corresponding to the fundamental torsional natural frequency of entire drill string ( Halsey 1986 , Brett 1992 , Kyllingstad 1988 ). It is easy to believe that stick-slip could generate cyclic torque on the drill...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17781001
...Influence of frequency-dependent spherical-wave effect on low-frequency seismic exploration: an example of AVA analysis Jingnan Li* (Sinopec Geophysical Research Institute), Shangxu Wang (China University of Petroleum-Beijing), Chunhui Dong (China University of Petroleum-Beijing), Shuangquan Chen...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17779157
... ABSTRACT According to lots of theoretical research and practical production data, it founds that there is a phenomenon of low frequency shadow beneath the oil and gas reservoirs, and in many cases, low frequency shadow can be used as a direct indicator to identify oil and gas. Therefore...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17638915
... ABSTRACT Power frequency noise is one of the most common noises during the acquisition of magnetotelluric signal. Though there are trap circuits designed in most of the acquisition devices to suppress the power frequency noise, however, the fundamental frequency of the power frequency noise...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13277746
... ABSTRACT The technique of blended acquisition with dispersed source arrays becomes an efficient simultaneous shooting method recording broadband data in land Vibroseis acquisition. Each vibrator or each group of vibrators is specified to cover certain narrow frequency bandwidth. For the low...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1566
... Summary The frequency sampling of frequency-domain reverse-time migration is defined by the Nyquist-Shannon theorem. An integration (summation) of the images over all frequencies during imaging condition corresponds to zero-lag cross-correlation in the time domain. We propose a method...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, March 26–28, 2013
Paper Number: IPTC-16881-MS
... Abstract This study addresses the performances of different approaches to tackle 3D frequency-domain Full Waveform Inversion (FWI). FWI is becoming an appealing method to build high resolution velocity models from wide-azimuth seismic data. Three-dimensional frequency-domain solutions...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1299
... Summary Using a combination of 3-D synthetic and field datasets, we motivate and demonstrate the effectiveness of a combined waveform inversion workflow using both single-frequency and broadband or time-domain inversion. We initially use single-frequency waveform inversion to isolate...
Journal Articles
Int. J. Offshore Polar Eng. 22 (03).
Paper Number: ISOPE-12-22-3-225
Published: 01 September 2012
...Cheon-hong Min; Soo-yong Park; Han-il Park This paper presents an application of the finite element (FE) model updating method with the use of natural frequency and zero frequency. A sensitivity analysis is employed to update the FE model, in which the zero frequencies are target parameters...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1262
... ABSTRACT A low-frequency resistivity survey using ERA electrical profiling (middle gradient array) has been completed over a nickel prospect in Porcupine District, Ontario, Canada. The results of this EM-Resistivity were used to calculate the apparent resistivity and were further inverted...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-1930
... Summary As a method to obtain a global minimum in waveform inversion, two kinds of frequency-selection strategy have been applied in waveform inversion. The two methods are similar to each other in that waveform inversion is performed sequentially by grouping frequencies into several groups...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1421
... ABSTRACT Field comparison of two commercially available high frequency vibrators built on identical vehicle frames but with significant differences in the weight of the reaction mass/baseplate and in hydraulic system capacity produced data with markedly different spectral characteristics...

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