US5343440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Geopressure analysis system
Assignee: Atlantic Richfield Co
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Filing: 1993-04-09
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Granted: 1994-08-30
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Expires: 2013-04-09
Abstract
Abstract Seismic data is combined with well log data to generate a two-dimensional geopressure prediction display; this permits deviated and horizontal well planning plus lithology detection. Shale fraction analysis, compaction trend, and seismic velocity may be automatically or interactively generated on a computer work station with graphics displays to avoid anomalous results. Corrections to velocity predictions by check shots or VSP, and translation of trend curves for laterally offset areas increases accuracy of the geopressure predictions. Multiple wells' logs in a basin permits analysis fluid migrations.
Inventors
- 👤 Tze-Kong Kan
- 👤 Sandy M. Zucker
- 👤 Matthew L. Greenberg
- 👤 William J. Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/44; G01V1/48; G01V1/50; E; E21; E21B; E21B47/00; E21B47/06; E21B49/00; E21B49/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A method of look ahead pressure assessment, comprising the steps of: (a) seismically estimating interval transit times as a function of depth at a proposed well location; (b) partially drilling a well at said well location; (c) measuring from inside said partially drilled well interval transit times as a function of depth; (d) replacing said seismically estimated interval transit times with corresponding measured interval transit times; (e) reestimating said seismically estimated interval transit times which were not replaced in step (d); and (f) comparing said reestimated interval transit times to a compaction trend to access pressure.
Claim 2
Independent Claim
96 words
A method of look ahead pressure assessment, comprising the steps of: (a) seismically estimating interval transit times as a function of depth at a proposed well location; (b) partially drilling a well at said well location; (c) measuring from inside said partially drilled well interval transit times as a function of depth; (d) replacing said seismically estimated interval transit times with corresponding measured interval transit times; (e) reestimating said seismically estimated interval transit times which were not replaced in step (d); and (f) comparing said reestimated interval transit times to a compaction trend to access pressure.
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) | 1997-08-29 | 1998-02-28 | 1998-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-29 | 2002-02-28 | 2002-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-29 | 2006-02-28 | 2006-08-30 | $7700.00 | Window Closed / Lapsed |