US4805725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nondestructive downhole seismic vibrator source and processes of utilizing the vibrator to obtain information about geologic formations
Assignee: Chevron USA Inc
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Filing: 1987-09-10
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Granted: 1989-02-21
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Expires: 2007-09-10
Abstract
Abstract The invention relates to a nondestructive downhole seismic source capable of generating S V -waves, S H -waves, and P-waves alone or in combination to determine information about a surrounding geologic formation. The invention also includes processes of performing crosswell tomography and reverse vertical seismic profiling. The invention also includes a means and process to carry out in hole seismic logging operations.
Inventors
- 👤 Bjorn N. P. Paulsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:10
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/02; G01V1/143; G01V1/145; G01V1/40; G01V1/42; G01V11/00; G01V11/002; G01V11/005; G01V2210/00; G01V2210/10; G01V2210/16; G01V2210/161; Y; Y10; Y10S; Y10S367/00; Y10S367/911; Y10S367/912
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A downhole seismic source comprising: a housing; means for clamping the housing in a well bore; a reaction mass in said housing, said reaction mass oriented to move generally perpendicular to the well bore axis; means for hydraulically moving said reaction mass such that forces are transmitted through, through said clamp and into the well bore to generate at least one detectable seismic wave of predetermined frequencies to said housing; and means for rotating said reaction mass around an axis generally parallel to the well bore axis so as to orientate said mass in a selected direction.
Claim 2
Dependent Claim
97 words
A downhole seismic source comprising: a housing; means for clamping the housing in a well bore; a reaction mass in said housing, said reaction mass oriented to move generally perpendicular to the well bore axis; means for hydraulically moving said reaction mass such that forces are transmitted through, through said clamp and into the well bore to generate at least one detectable seismic wave of predetermined frequencies to said housing; and means for rotating said reaction mass around an axis generally parallel to the well bore axis so as to orientate said mass in a selected direction.
Claim 3
Dependent Claim
18 words
The source as recited in claim 1 further comprising a means for determining an orientation of said source.
Claim 4
Dependent Claim
18 words
The source as recited in claim 2 wherein said means for determining an orientation is a downhole gyro.
References Cited (Backward Citations)
US4524433A
Cited
US4593559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |