Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1998-01-28
2000-02-22
Bagnell, David
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
73152, 175 48, E21B 4702
Patent
active
060269146
ABSTRACT:
A method is presented for accurately surveying and determining the profile of the path of a subterranean wellbore containing a constant density fluid extending contiguously throughout. A first pressure sensor, associated with a downhole tool, is traversed station-by-station along the wellbore for measuring the pressure of the fluid within the wellbore at each station. A second pressure sensor is located within the wellbore fluid at a known elevation. The elevation of the first pressure sensor, at a station, is determined by adding the calculated differential height to the known absolute elevation of the second sensor. As each elevation is referenced to the second sensor, no cumulative errors are incurred. If the density of the fluid is unknown, a third pressure sensor within the wellbore fluid can be provided at a known elevation different from that of the second sensor. The areal position of each station is determined by conventional means associated with the downhole tool. The elevation for each of a plurality of stations is combined with the areal position determined at each station to determine the path of the wellbore.
REFERENCES:
patent: 4875292 (1989-10-01), Gibson
patent: 5333686 (1994-08-01), Vaughan et al.
patent: 5585726 (1996-12-01), Chau
patent: 5695015 (1997-12-01), Barr et al.
Adams John R.
Hay Ross
Alberta Oil Sands Technology and Research Authority
Bagnell David
Mihalik George M.
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