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Backsight

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Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-271
..., where the elevation of a point in the area of interest vas compared with a point 30 m away. This second point, although sufficiently far away to be, assumed as being stable, vas monitored periodically by comparison with a third point a further 30 m away. Equal sighting distances to the backsight and...
Proceedings Papers

Paper presented at the Drilling and Production Practice 1938, February 17–18, 1938
Paper Number: API-38-029
... medium which, in turn, would prevent the penetration of the mud-laden fluid into the voids. (This may be backsight.) A colloidal mud, of course, will seal a porous sand and prevent penetration of an appreciable quantity of fluid. Such a mud, however, generally will not seal over a producing medium such...
Proceedings Papers

Paper presented at the SPE Russian Petroleum Technology Conference and Exhibition, October 24–26, 2016
Paper Number: SPE-181921-MS
... associated with the foaming solution. The stated pump performance does not correspond to reality. During the run, the BHA noted the discrepancy in the measurement tool. Bottom was reached at 3,399.5-m MD. An inclination measurement via backsight logging in the column showed a significant difference in...
Proceedings Papers

Paper presented at the 1983 SEG Annual Meeting, September 11–15, 1983
Paper Number: SEG-1983-0521
... calibration measurements to establish local magnetic declination, alternate backsight and foresight data from rod turn points, distance measurements by three- hair stadia method, and observations of sideshots for seismic groups. Both the field notes and the P3 format are shown to demonstrate the method of...
Proceedings Papers

Paper presented at the 1983 SEG Annual Meeting, September 11–15, 1983
Paper Number: SEG-1983-0522
... magnetic declination, alternate backsight and foresight data from rod turn points, distance measurements by three- hair stadia method, and observations of sideshots for seismic groups. Both the field notes and the P3 format are shown to demonstrate the method of coding measurements within the data set...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 1981
Paper Number: OTC-4020-MS
... proved adequate for the task at hand. As the procedure evolved, it was determined that a carrnand of mark from the supervisor on shore would predicate that all shore triangulation parties would lock instrunents on the Spar, record the angle from the knCMn azimuth backsight station and sinulta- neously...
Proceedings Papers

Paper presented at the 4th ISRM Congress, September 2–8, 1979
Paper Number: ISRM-4CONGRESS-1979-101
... independently. The backward and, forward level- ling was done on the same day. The backsight and foresight distances were not greater than 30 m to avoid optical disturbance and levelling was not done when the temperature was is excess, of 300C. Also, it was not done for more than 4 hours continuously to avoid...
Proceedings Papers

Paper presented at the The 17th U.S. Symposium on Rock Mechanics (USRMS), August 25–27, 1976
Paper Number: ARMA-76-0185
... theodolite is then placed over the stake, and horizontal angles are turned to a number of prominent objects in the field of view from an established backsight station. It is desirable to locate six or seven control points within the area covered by each photograph. Current plan maps can also be used to...
Journal Articles
Transactions of the AIME 136 (01): 37–56.
Paper Number: SPE-940037-G
Published: 01 December 1940
... methods is short, aljd such fields have not been produced to exhaustion. Comparisons must be based upon estimated rather than proved ultimate recoveries in the newer fields, and a long "fore- sight" must be projected from a short "backsight." However, our engineers have osme data that indicate that fields...

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