US5124952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation fracture detection using instantaneous characteristics of sonic waveforms
Assignee: Halliburton Logging Services Inc
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Filing: 1989-05-17
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Granted: 1992-06-23
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Expires: 2009-05-17
Abstract
Abstract A method for enhancing a plurality of recorded waveforms from sonic logging is disclosed. As a function of depth along a well borehole, a plurality of sonic waveforms is obtained. Adjacent waveforms are registered by time shifting so that common event coincides between adjacent waveforms. Typically this is the arrival of the P, S or S t wave component. Then, adjacent waveforms are subtracted from one another to provide a difference waveform, and the difference waveforms are then presented. This enhances oblique occurring events. Further, instantaneous waveform characteristics for each of the recorded waveforms are presented to further assist in data interpretation to locate and identify oblique occurring events.
Inventors
- 👤 Stanislav Knize
- 👤 John W. Minear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:05
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/44; G01V1/48
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
133 words
A method of enhancing presentation of multiple logging traces from acoustic radiation wherein the method comprises: (a) at selected and spaced depths along a well borehole, transmitting and receiving an acoustic pulse from a sonde repetitively to form a plurality of acoustic traces wherein adjacent traces are obtained at different depths in the well borehole and each trace represents the acoustic pulse response; (b) aligning a sufficient number of adjacent traces to a common P event in the traces to obtain common registration between the traces so that the trace provide a modified representation: (c) subtracting adjacent traces after alignment to obtain a difference trace; and (d) recording on a medium the difference traces as a function of time in the well borehole wherein the recordings provide a presentation enhancing oblique occurring events.
Claim 2
Independent Claim
133 words
A method of enhancing presentation of multiple logging traces from acoustic radiation wherein the method comprises: (a) at selected and spaced depths along a well borehole, transmitting and receiving an acoustic pulse from a sonde repetitively to form a plurality of acoustic traces wherein adjacent traces are obtained at different depths in the well borehole and each trace represents the acoustic pulse response; (b) aligning a sufficient number of adjacent traces to a common P event in the traces to obtain common registration between the traces so that the trace provide a modified representation: (c) subtracting adjacent traces after alignment to obtain a difference trace; and (d) recording on a medium the difference traces as a function of time in the well borehole wherein the recordings provide a presentation enhancing oblique occurring events.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the step of recording utilizes color coding to enhance the recorded presentation.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein adjacent traces are recorded for a specified time interval dependent on the extent of investigation from the well borehole.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein instantaneous waveform characteristics at a selected set of points along each individual waveform are separately provided for frequency, phase and waveform modules.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein instantaneous data is recorded for a time of about 4000 microseconds.
Claim 7
Dependent Claim
19 words
The method of claim 1 including the step of obtaining traces at evenly spaced depths along the well borehole.
Claim 8
Dependent Claim
20 words
The method of claim 1 including the step of obtaining traces by an acoustic receiver directed in a common azimuth.
Claim 9
Dependent Claim
37 words
The method of claim 1 including the step of forming a first record of traces, and a second record of traces by the method of claim 1 to enable a contrast between the first and second records.
Claim 10
Independent Claim
132 words
A method of enhancing presentation of multiple logging traces from acoustic radiation wherein the method comprises: (a) at selected and spaced depths along well borehole; transmitting and receiving an acoustic pulse from a sonde repetitively to form a plurality of acoustic traces wherein adjacent traces are obtained at different depths in the well borehole and each trace represents the acoustic pulse response; (b) aligning a sufficient number of adjacent traces to a common S event in the traces to obtain common registration between the traces so that the trace provide a modified representation: (c) substracting adjacent traces after alignment to obtain a difference trace; and (d) recording on a medium the difference traces as a function of time in the well borehole wherein the recordings provide a presentation enhancing oblique occurring events.
Claim 11
Independent Claim
132 words
A method of enhancing presentation of multiple logging traces from acoustic radiation wherein the method comprises: (a) at selected and spaced depths along well borehole; transmitting and receiving an acoustic pulse from a sonde repetitively to form a plurality of acoustic traces wherein adjacent traces are obtained at different depths in the well borehole and each trace represents the acoustic pulse response; (b) aligning a sufficient number of adjacent traces to a common S event in the traces to obtain common registration between the traces so that the trace provide a modified representation: (c) substracting adjacent traces after alignment to obtain a difference trace; and (d) recording on a medium the difference traces as a function of time in the well borehole wherein the recordings provide a presentation enhancing oblique occurring events.
Claim 12
Dependent Claim
18 words
The method of claim 9 wherein the step of recording utilizes color coding to enhance the recorded presentation.
Claim 13
Dependent Claim
25 words
The method of claim 9 wherein adjacent traces are recorded for a specified time interval dependent on the extent of investigation from the well borehole.
Claim 14
Dependent Claim
28 words
The method of claim 9 wherein instantaneous waveform characteristics at a selected set of points along each individual waveform are separately provided for frequency, phase and waveform modules.
Claim 15
Dependent Claim
17 words
The method of claim 12 wherein instantaneous data is recorded for a time of about 4000 microseconds.
Claim 16
Dependent Claim
19 words
The method of claim 9 including the step of obtaining traces at evenly spaced depths along the well borehole.
Claim 17
Dependent Claim
20 words
The method of claim 9 including the step of obtaining traces by an acoustic receiver directed in a common azimuth.
Claim 18
Dependent Claim
37 words
The method of claim 9 including the step of forming a first record of traces, and a second record of traces by the method of claim 9 to enable a contrast between the first and second records.
Claim 19
Independent Claim
133 words
A method of enhancing presentation of multiple logging traces from acoustic radiation wherein the method comprises: (a) at selected and spaced depths along well borehole; transmitting and receiving an acoustic pulse from a sonde repetitively to form a plurality of acoustic traces wherein adjacent traces are obtained at different depths in the well borehole and each trace represents the acoustic pulse response; (b) aligning a sufficient number of adjacent traces to a common S t event in the traces to obtain common registration between the traces so that the trace provide a modified representation: (c) substracting adjacent traces after alignment to obtain a difference trace; and (d) recording on a medium the difference traces as a function of time in the well borehole wherein the recordings provide a presentation enhancing oblique occurring events.
Claim 20
Independent Claim
133 words
A method of enhancing presentation of multiple logging traces from acoustic radiation wherein the method comprises: (a) at selected and spaced depths along well borehole; transmitting and receiving an acoustic pulse from a sonde repetitively to form a plurality of acoustic traces wherein adjacent traces are obtained at different depths in the well borehole and each trace represents the acoustic pulse response; (b) aligning a sufficient number of adjacent traces to a common S t event in the traces to obtain common registration between the traces so that the trace provide a modified representation: (c) substracting adjacent traces after alignment to obtain a difference trace; and (d) recording on a medium the difference traces as a function of time in the well borehole wherein the recordings provide a presentation enhancing oblique occurring events.
Claim 21
Dependent Claim
18 words
The method of claim 17 wherein the step of recording utilizes color coding to enhance the recorded presentation.
Claim 22
Dependent Claim
25 words
The method of claim 17 wherein adjacent traces are recorded for a specified time interval dependent on the extent of investigation from the well borehole.
Claim 23
Dependent Claim
28 words
The method of claim 17 wherein instantaneous waveform characteristics at a selected set of points along each individual waveform are separately provided for frequency, phase and waveform modules.
Claim 24
Dependent Claim
17 words
The method of claim 20 wherein instantaneous data is recorded for a time of about 4000 microseconds.
Claim 25
Dependent Claim
19 words
The method of claim 17 including the step of obtaining traces at evenly spaced depths along the well borehole.
Claim 26
Dependent Claim
20 words
The method of claim 17 including the step of obtaining traces by an acoustic receiver directed in a common azimuth.
Claim 27
Dependent Claim
37 words
The method of claim 17 including the step of forming a first record of traces, and a second record of traces by the method of claim 17 to enable a contrast between the first and second records.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |