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Delta t

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Pre- and Post-Frac <span class="search-highlight">Delta</span> <span class="search-highlight">T</span>. Note the <span class="search-highlight">delta</span> <span class="search-highlight">T</span> kicks on the bottom post-frac ...
Published: 29 January 2019
Figure 4 Pre- and Post-Frac Delta T. Note the delta T kicks on the bottom post-frac plot aligned with perforations. Note no changes in DTS, DTC between the pre- and post-frac in two marked perforations clusters. The absence of change (increase in post-frac DT) suggests ineffective or unstimulated ... More
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Log of <span class="search-highlight">Delta</span>-<span class="search-highlight">T</span> and correlation values. &quot;A. <span class="search-highlight">Delta</span>-<span class="search-highlight">T</span>&quot;-conventional stacking; ...
Published: 09 June 2008
Figure 6 Log of Delta-T and correlation values. "A. Delta-T"-conventional stacking; "B. Delta-T" - rotary stacking [us/ft] A & B Correlation Values represent conventional and rotary stacking, respectively. More
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Log example of coal seam (low GR, low density, high neutron, high <span class="search-highlight">delta</span> <span class="search-highlight">t</span> a...
Published: 17 April 2001
Fig. 1 Log example of coal seam (low GR, low density, high neutron, high delta t and high resistivity) More
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Using the Acoustic <span class="search-highlight">delta</span>-<span class="search-highlight">T</span> measurement in real-time for pore pressure analy...
Published: 04 March 2014
Figure 10 Using the Acoustic delta-T measurement in real-time for pore pressure analysis. Early use of the data established trends and the overburden from the mudline. More
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Relative changes between Pre- and Post-Frac <span class="search-highlight">delta</span> <span class="search-highlight">T</span> Shear horizontal. The h...
Published: 29 January 2019
Figure 6 Relative changes between Pre- and Post-Frac delta T Shear horizontal. The higher difference, most likely better cluster efficiency. More
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Overpressure interval is indicated by sonic (DTCO-<span class="search-highlight">delta</span> ‘<span class="search-highlight">t</span>’ compressional) ...
Published: 23 January 2012
Figure 1 Overpressure interval is indicated by sonic (DTCO-delta ‘t’ compressional) data starting at ~14550 ft tvdss in KW field. More
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A crossplot of the real-time Compressional <span class="search-highlight">Delta</span>-<span class="search-highlight">T</span> result with a processed ...
Published: 27 June 2010
Figure 4 A crossplot of the real-time Compressional Delta-T result with a processed Compressional Delta-T shows approximately 1-to-1 correlation and an R-squared value of 0.96. Downhole processing algorithms used to obtain the real-time acoustic log are configured prior to drilling to label the Co... More
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Minimum <span class="search-highlight">delta</span> <span class="search-highlight">T</span>
Published: 19 September 2010
Figure 9 Minimum delta T More
Proceedings Papers

Paper presented at the SPE/CERI Gas Technology Symposium, April 3–5, 2000
Paper Number: SPE-59795-MS
... Abstract The Mallik 2L-38 well was drilled in February and March, 1998 to a depth of 1150m at a site located in the Mackenzie Delta, N. W. T., Canada. Undertaken as a collaborative agreement between the Japan National Oil Corporation and the Geological Survey of Canada, the well was conducted...
Proceedings Papers

Paper presented at the SPWLA 17th Annual Logging Symposium, June 9–12, 1976
Paper Number: SPWLA-1976-J
... ABSTRACT For the past five years, Imperial Oil has run a crystal cable velocity survey as an integral part of the near-surface borehole logging program in all wells in the Mackenzie Delta. The results have been found to be a useful addition to the data available from conventional logging...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 27–30, 1987
Paper Number: SPE-16811-MS
... identified. The reason for resorting to a log-log plot [log (pi - pwf) vs. log (t + delta t)] rather than a semilog plot is that an identifiable straight line may not exist on a Horner plot if delta t t for in such cases (t + delta t)/delta t approximates 1. (Under such circumstances, the possibility...
Journal Articles
J Pet Technol 24 (09): 1139–1141.
Paper Number: SPE-4145-PA
Published: 01 September 1972
... »delta t. pwf vs log t will also give a straight line if t »delta t. When t >> delta t, log(t + delta t) log t and log log t. If we let log (t + delta t) = log t in Eq. 1 and rearrange, the following expression results. ........(3) It is apparent from inspection of Eq. 3 that a plot of Pwf vs log...
Journal Articles
J Pet Technol 17 (03): 282–286.
Paper Number: SPE-991-PA
Published: 01 March 1965
..., the BHC Sonic (bore hole compensated), has been developed to accomplish these purposes. Previous sonic delta t logs have had large errors caused by irregular borehole diameter. In rough holes interpretation has been difficult, particularly in thin beds. The new BHC system suppresses these errors...
Proceedings Papers

Paper presented at the SPE Gas Technology Symposium, June 7–9, 1978
Paper Number: SPE-7162-MS
.... The procedure, as shown in Figure 1, consists of flowing the well at a constant rate, q, for a time, t, and then shutting-in the well for a time, delta t, while measuring the bottom-hole pressure during the shut-in period. pressure during the shut-in period. There are a substantial number of papers written...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-ZZ
... fundamental mode typically begins at approximately 3 kHz, and it has an infinite number of higher order modes, similar to the situation encountered with a dipole flexural mode. Many existing algorithms that determine delta-T compressional (DTC) do not use the low-frequency dispersion characteristics...
Proceedings Papers

Paper presented at the SPE Gas Technology Symposium, June 7–9, 1989
Paper Number: SPE-19098-MS
... of Pwf decreases; for pressure buildup conditions a graph of mD(1,delta t aD)/qD(delta t aD=0) vs (t aD+delta t aD)/delta t aD shows values of this slope within 1% of the 1.1513 value. The maximum error was in the rate performance simulated cases that included high-velocity flow, being less than 13...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 21–24, 1980
Paper Number: SPE-9289-MS
... pressure buildup data is not as bad as it may first appear. As long as the producing time, t, prior to shut-in is sufficiently long compared to the shut-in time, Delta t [that is (t +Delta t)/t 1], for liquid systems, it is reasonable to analyze pressure buildup data using drawdown type curves. However...

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