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Title: Wellbore inertial directional surveying system

Abstract

A wellbore inertial directional surveying system for providing a complete directional survey of an oil or gas well borehole to determine the displacement in all three directions of the borehole path relative to the well head at the surface. The information generated by the present invention is especially useful when numerous wells are drilled to different geographical targets from a single off-shore platform. Accurate knowledge of the path of the borehole allows proper well spacing and provides assurance that target formations are reached. The tool is lowered down into a borehole on the electrical cable. A computer positioned on the surface communicates with the tool via the cable. The tool contains a sensor block which is supported on a single gimbal, the rotation axis of which is aligned with the cylinder axis of the tool and, correspondingly, the borehole. The gyroscope measurement of the sensor block rotation is used in a null-seeking servo loop which essentially prevents rotation of the sensor block aboutthe gimbal axis. Angular rates of the sensor block about axes which are perpendicular to the gimbal axis are measured by gyroscopes in a manner similar to a strapped-down arrangement. Three accelerometers provide acceleration information as the toolmore » is lowered within the borehole. The uphole computer derives position information based upon acceleration information and anular rate information. Kalman estimation techniques are used to compensate for system errors.« less

Inventors:
 [1];  [1];  [1];  [1]
  1. (Albuquerque, NM)
Issue Date:
Research Org.:
AT & T CORP
OSTI Identifier:
867684
Patent Number(s):
4987684
Assignee:
United States of America as represented by United States (Washington, DC) SNL
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
wellbore; inertial; directional; surveying; providing; complete; survey; oil; gas; borehole; determine; displacement; directions; path; relative; head; surface; information; generated; especially; useful; numerous; drilled; geographical; targets; single; off-shore; platform; accurate; knowledge; allows; proper; spacing; provides; assurance; target; formations; reached; tool; lowered; electrical; cable; computer; positioned; communicates; via; contains; sensor; block; supported; gimbal; rotation; axis; aligned; cylinder; correspondingly; gyroscope; measurement; null-seeking; servo; loop; essentially; prevents; aboutthe; angular; rates; axes; perpendicular; measured; gyroscopes; manner; similar; strapped-down; arrangement; accelerometers; provide; acceleration; uphole; derives; position; based; anular; rate; kalman; estimation; techniques; compensate; errors; sensor block; position information; especially useful; rotation axis; electrical cable; rate information; manner similar; path relative; target formation; wellbore inertial; inertial directional; directional surveying; /33/

Citation Formats

Andreas, Ronald D., Heck, G. Michael, Kohler, Stewart M., and Watts, Alfred C. Wellbore inertial directional surveying system. United States: N. p., 1991. Web.
Andreas, Ronald D., Heck, G. Michael, Kohler, Stewart M., & Watts, Alfred C. Wellbore inertial directional surveying system. United States.
Andreas, Ronald D., Heck, G. Michael, Kohler, Stewart M., and Watts, Alfred C. Tue . "Wellbore inertial directional surveying system". United States. https://www.osti.gov/servlets/purl/867684.
@article{osti_867684,
title = {Wellbore inertial directional surveying system},
author = {Andreas, Ronald D. and Heck, G. Michael and Kohler, Stewart M. and Watts, Alfred C.},
abstractNote = {A wellbore inertial directional surveying system for providing a complete directional survey of an oil or gas well borehole to determine the displacement in all three directions of the borehole path relative to the well head at the surface. The information generated by the present invention is especially useful when numerous wells are drilled to different geographical targets from a single off-shore platform. Accurate knowledge of the path of the borehole allows proper well spacing and provides assurance that target formations are reached. The tool is lowered down into a borehole on the electrical cable. A computer positioned on the surface communicates with the tool via the cable. The tool contains a sensor block which is supported on a single gimbal, the rotation axis of which is aligned with the cylinder axis of the tool and, correspondingly, the borehole. The gyroscope measurement of the sensor block rotation is used in a null-seeking servo loop which essentially prevents rotation of the sensor block aboutthe gimbal axis. Angular rates of the sensor block about axes which are perpendicular to the gimbal axis are measured by gyroscopes in a manner similar to a strapped-down arrangement. Three accelerometers provide acceleration information as the tool is lowered within the borehole. The uphole computer derives position information based upon acceleration information and anular rate information. Kalman estimation techniques are used to compensate for system errors.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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