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Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0080
... a power supply with a frequency of 25 kHz and an intensity of 10 volts is applied to the transmitting antenna, the induced voltage on the ME antenna were measured as 0.913 mv at 24 inch and 0.233 mv at 48 inch, satisfying the definition of the electromagnetic antenna, demonstrating that the induced...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0119
... media in conjunction with the Taylor series expansion for the voltage ratio measured by a propagation tool. In so doing, we find that in a resistive formation where the dielectric effect is small: 1) the phase shift measurement is primarily due to the first-order eddy current induced in the formation; 2...
Proceedings Papers

Paper presented at the SPWLA 55th Annual Logging Symposium, May 18–22, 2014
Paper Number: SPWLA-2014-NN
... and field examples illustrate the high-information content and resolution power of the imager. log analysis impedance spwla 55 mandrel frequency oil-based mud voltage well logging resistive formation diameter Symposium Upstream Oil & Gas ohmm borehole wall vertical resolution...
Proceedings Papers

Paper presented at the SPWLA 49th Annual Logging Symposium, May 25–28, 2008
Paper Number: SPWLA-2008-HHHH
... Abstract Induction tools are designed to measure formation conductivity. The measured in-phase voltage is linearly proportional to the formation conductivity at moderate to high formation resistivities, and gradually becomes non-linear due to skin effect as formation resistivity decreases...
Proceedings Papers

Paper presented at the SPWLA 49th Annual Logging Symposium, May 25–28, 2008
Paper Number: SPWLA-2008-JJJ
... the volume of investigation. Upstream Oil & Gas high-resolution sensor real time system new borehole magnetic susceptibility tool coil Symposium susceptibility measurement vertical resolution spwla 49th well logging sensitivity voltage krammer log analysis Susceptibility borehole...
Proceedings Papers

Paper presented at the SPWLA 43rd Annual Logging Symposium, June 2–5, 2002
Paper Number: SPWLA-2002-X
... of the mixing of connate and injection water. log analysis ohmm investigation service company Upstream Oil & Gas HLLD voltage casedhole resistivity resistivity CHFR RTCH Symposium resistivity log spwla 43 resistivity tool electrode well logging prototype TCR application saturation...
Proceedings Papers

Paper presented at the SPWLA 43rd Annual Logging Symposium, June 2–5, 2002
Paper Number: SPWLA-2002-Y
... must be measured. The current is determined by making highly accurate voltage measurements along the casing. Although relatively simple in theory, this is extremely difficult in practice because of the enormous contrast in electromagnetic properties of steel and earth formations. Steel casing is 10 7...
Proceedings Papers

Paper presented at the SPWLA 42nd Annual Logging Symposium, June 17–20, 2001
Paper Number: SPWLA-2001-FFF
... data Symposium resistivity lateral log inversion estimation exploration well voltage interpretation invasion well logging spwla 42 application saturation reservoir Australia SPWLA 42 "d Annual Logging Symposium, June 17-20, 2001 IMPACT OF ARRAY LATERAL LOGS ON SATURATION ESTIMATIONS...
Proceedings Papers

Paper presented at the SPWLA 41st Annual Logging Symposium, June 4–7, 2000
Paper Number: SPWLA-2000-DD
... closely. Casing imperfections and collars are successfully compensated. HISTORY The concept of evaluating formation resistivity from inside a metal casing traces to Alpin (1939), who proposed a three-electrode instrument to measure voltage differences along the casing. Only in recent years, however, have...
Proceedings Papers

Paper presented at the SPWLA 35th Annual Logging Symposium, June 19–22, 1994
Paper Number: SPWLA-1994-VV
... ABSTRACT One of the main errors observed with the deep laterolog (LLd) measurement is caused by perturbation of the downhole reference electrode voltage by the total current returning to the surface electrode. This phenomenon is the cause of the well known Groningen effect. It is also manifest...
Proceedings Papers

Paper presented at the SPWLA 34th Annual Logging Symposium, June 13–16, 1993
Paper Number: SPWLA-1993-F
... current to leak from the casing into the adjacent formations. Voltage measurement electrodes and sensitive potential difference detectors allow the leakage current and the formation resistivity to be determined. Several calibration procedures are used to correct for any casing thickness changes, varying...
Proceedings Papers

Paper presented at the SPWLA 34th Annual Logging Symposium, June 13–16, 1993
Paper Number: SPWLA-1993-JJ
...-rn. well logging laboratory resistivity measurement contactless probe machine learning Upstream Oil & Gas communication Probe Symposium Artificial Intelligence pore voltage measurement system spwla 34th log analysis frequency true resistivity inversion resistivity...
Proceedings Papers

Paper presented at the SPWLA 34th Annual Logging Symposium, June 13–16, 1993
Paper Number: SPWLA-1993-Y
... capabilities. log analysis detector neutron source technology application Symposium well logging generator diameter voltage Upstream Oil & Gas electron beam instrument flux spwla 34th lithology induction cell intensity pressure housing injector formation density operation...
Proceedings Papers

Paper presented at the SPWLA 32nd Annual Logging Symposium, June 16–19, 1991
Paper Number: SPWLA-1991-C
... computer simulation, to infer from the MWD logs the resistivity of the formation and the invasion profile. investigation depth Invasion Diameter voltage Upstream Oil & Gas annual technical conference investigation well logging phase difference spwla 32nd amplitude ratio equation...
Proceedings Papers

Paper presented at the SPWLA 27th Annual Logging Symposium, June 9–13, 1986
Paper Number: SPWLA-1986-DDD
... instrument acquires a count rate from the short- spaced detector and a 256-channel spectrum from the long-spaced detector. The short-spaced count rate is obtained through the use of a voltage discriminator, which accepts short-spaced detector pulses that are above the discriminator voltage. The discriminator...
Proceedings Papers

Paper presented at the SPWLA 22nd Annual Logging Symposium, June 23–26, 1981
Paper Number: SPWLA-1981-HH
... by the cable. The microcomputer also implements gain ranging by automatic control of the correlation curve measure voltage allowing operation from very low to high resistivities. The paper provides a system design overview. The objective of the paper is to provide the log analyst increased knowledge...
Proceedings Papers

Paper presented at the SPWLA 18th Annual Logging Symposium, June 5–8, 1977
Paper Number: SPWLA-1977-Z
... frequency effect Spwla Eighteenth voltage cable complex formation resistivity electrode SPWLA EIGHTEENTH ANNUAL LOGGING SYMPOSIUM, JUNE 5-8, 1977 COMPLEX FORMATION RESISTIVITY - THE FORGOTTEN HALF OF THE RESISTIVITY LOG BY D. D. Snyder, R. H. Merkel, J. T. Williams Exploration Data Consultants, Inc...
Proceedings Papers

Paper presented at the SPWLA 16th Annual Logging Symposium, June 4–7, 1975
Paper Number: SPWLA-1975-GG
... an understanding of the sources of errors, of the way errors are minimized in the calibration process, and of the significance of changes in recorded calibration data. well logging data quality calibration process circuitry log analysis detector Upstream Oil & Gas Spwla Sixteenth voltage...
Proceedings Papers

Paper presented at the SPWLA 8th Annual Logging Symposium, June 12–14, 1967
Paper Number: SPWLA-1967-W
... is supplied to a pair of in hole electrodes, while the transient decay voltages following these pulses are detected with a second pair of electrodes and recorded. Induced polarization logs are useful in evaluating mineral prospect boreholes, but such measurements may also have some application in evaluating...
Proceedings Papers

Paper presented at the SPWLA 7th Annual Logging Symposium, May 9–11, 1966
Paper Number: SPWLA-1966-U
... of an alternat- ing current, a series of square-wave current pulses is passed between the current electrodes. These pulses are about 0.20 second in length, separated by intervals of the same length during which no current flows. The voltage across the potential electrodes is averaged and recorded during...

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