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Pre- and Post-Frac <b>Delta</b> <b>T</b>. Note the <b>delta</b> <b>T</b> 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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Minimum <b>delta</b> <b>T</b>
Published: 19 September 2010
Figure 9 Minimum delta T More
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A crossplot of the real-time Compressional <b>Delta</b>-<b>T</b> 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 More
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Relative changes between Pre- and Post-Frac <b>delta</b> <b>T</b> 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-<b>delta</b> ‘<b>t</b>’ compressional) ...
Published: 23 January 2012
Figure 1 Overpressure interval is indicated by sonic (DTCO-deltat’ compressional) data starting at ~14550 ft tvdss in KW field. More
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Using the Acoustic <b>delta</b>-<b>T</b> 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
Proceedings Papers

Paper presented at the SPWLA 17th Annual Logging Symposium, June 9–12, 1976
Paper Number: SPWLA-1976-J
...SPWLA SEVENTEENTH ANNUAL LOGGINGSYMPOSIUM,JUNE 9-12,1976 PERMAFROST INVESTIGATIONS BY CRYSTAL CABLE SURVEYS MACKENZIE DELTA, N.W.T. by J.H.D. Walker and A.J. Stuart Imperial Oil Limited Calgary, Alberta ABSTRACT For the past five years, Imperial Oil has run a crystal cable velocity survey...
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
SPE Form Eval 2 (02): 179–185.
Paper Number: SPE-14313-PA
Published: 01 June 1987
... equals 1. Similarly, the infinite shut-in time corresponds to the time equivalent to tp, the producing time before shut-in, as Eq. 1 indicates: (1) To apply the MBH method in Fig. 1, we simply obtain from the MBH function p*−p for a certain tp and subtract this value from p*-pwf (delta t = 0) to obtain p...
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...
Journal Articles
SPE Form Eval 2 (04): 609–610.
Paper Number: SPE-13733-PA
Published: 01 December 1987
.... Extension to Two-Rate Tests If the rate at the active well is changed from q1 to q2 at time t, it can be shown that (5) where (6) Eq. 5 is similar to Eq. 2 and yields a straight line if Delta t(p'+C)q1/(q1 -q2) is plotted vs. 1/At on a semilog plot. In this format, the slope and intercept of the straight...
Journal Articles
SPE Prod & Oper 3 (02): 273–279.
Paper Number: SPE-13602-PA
Published: 01 May 1988
... to be zero. A mass balance of solvent in the element A delta × in a time delta t yields Divide by delta t delta × and let delta t, delta x-O. In the limit, Experimental observations indicate that once a stable flow rate has been attained with water, the injection of solvent is not followed by any appreciable...
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...
Images
<b>Delta</b> pressure P 1 (<b>t</b>)-P 0 *(<b>t</b>) calculation and <b>t</b> 01  detection time determ...
Published: 01 December 2020
Figure 13 Delta pressure P 1 (t)-P 0 *(t) calculation and t 01 detection time determination by tangent method – W7/W8 interference More
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<b>Delta</b> pressure P 2 (<b>t</b>)-P 1 *(<b>t</b>) calculation and <b>t</b> 02  detection time determ...
Published: 01 December 2020
Figure 18 Delta pressure P 2 (t)-P 1 *(t) calculation and t 02 detection time determination by tangent method – W5/W8 interference More

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