Patent
Angular rate and position transducer for borehole survey instrument
TLDR
A transducer for sensing the angular position or rate of change of displacement of a housing of a borehole survey instrument with respect to a reference position is described in this article.Abstract:
A transducer for sensing the angular position or rate of change of displacement of a housing of a borehole survey instrument with respect to a reference position includes a rotor magnetically suspended within a stator which is in turn secured to the housing. The rotor is constrained by the magnetic suspension to rotate about a single axis relative to the stator. A frame of reference is established for the transducer, against which subsequent measurements are compared. Optical sensing means are included for sensing the movement of the rotor about the axis of motion to develop an indication of the angular position or rate of change of position of the housing.read more
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Patent
Methods for visualizing distances between wellbore and formation boundaries
Peiwen Xia,Jan W. Smits,Lawrence Chou,Qiming Li,Dzevat Omeragic,James F. Bristow,Paul A. Wand,Jean-Michel Denichou +7 more
TL;DR: In this article, a method for displaying a formation model includes displaying a trajectory representing a three-dimensional structure of the wellbore; and displaying objects representing a bed boundary along the trajectory, wherein the objects are displayed at distances from the trajectory according to measurement data.
Patent
Pipeline caliper pig
TL;DR: An improved pipeline caliper pig for providing a record of the deviations of the interior wall of a pipeline including a pig body assembly having a longitudinal axis and support members, is described in this paper.
Patent
Apparatus and method for gravity correction in borehole survey systems
TL;DR: In this paper, the gravity correction is effected in the survey signal processor (24) and is based on a gravity gradient signal that mathematically corresponds to formula (I), where f represents the specific force due to gravity; fo represents specific force of gravity at wellhead (20) of borehole (12); Ro represents the average radius of the earth; rho(H) represents the local density of the geological formation penetrated by the borehole as a function of depth H; and rhoave represents the mean density of earth.
Patent
Method and device for the measurement of the drift of a borehole
TL;DR: In this paper, the angle of drift of a borehole is measured using a microprocessor control and a sensor pack, which is mounted on a sensor chassis. But, it is not known whether the microprocessor controller and the sensor pack are contained within the exterior casing.
Patent
High resolution digital inclinometer
TL;DR: In this paper, an inclinometer is used to produce high-resolution signals of inclination relative to various references and which is capable of displaying inclination angles in various modes, including an audible output.
References
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Patent
Mapping apparatus employing two input axis gyroscopic means
TL;DR: In this article, a gyroscope and a carrier frame are used for mapping, where the rotor spin frequency has a predetermined relation to a resonant frequency of a gimbal.
Patent
Electrostatic support system
TL;DR: In this article, an electrostatic support for supporting an electrically conductive member, for example, a spherically shaped gyroscope rotor, is presented, where a plurality of electrode pairs are positioned around the conductor, with one electrode of a pair positioned opposite the other electrode of the pair.
Patent
Apparatus for indicating angular position in a vertical direction
TL;DR: In this paper, an accelerometer is provided which comprises a pendulum rotatable about an axis and which is arranged for measuring vertical angles, and a rotatable device which is preferably of the moving coil type is located at the axis of rotation of the pendulum.
Patent
Survey apparatus, method employing angular accelerometer
TL;DR: A method of determining azimuth involves use of an angular accelerometer, and includes: (a) rotating the accelerometer about a first axis, while the acceleration is carried on a body which is itself rotating about a second axis, and (b) detecting the acceleration output caused by said rotation as discussed by the authors.
Patent
Method and apparatus for borehole directional logging
TL;DR: In this article, a method and arrangement for BOREHOLE-DIRECTIONAL LOGGING is presented, in which the first and second co-lamps are used to determine the location of the Borehole.