Inertial measurement unit and single-axis servo successive inclinometry method
An inertial measurement unit and inclinometer technology, applied in surveying, earthwork drilling, wellbore/well components, etc., can solve problems such as unreliable readings, decreased sensitivity, and decreased instrument measurement accuracy
Active Publication Date: 2016-08-31
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
When the well inclination is large, the sensitivity of the accelerometer to the change of the well inclination will drop sharply, and the readings will become unreliable, resulting in a decline in the measurement accuracy of the instrument
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[0073] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.
[0074] The present invention will be further described below in conjunction with the accompanying drawings and ...
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The invention provides an inertial measurement unit and a single-axis servo successive inclinometry method. An inertial component adopts two fiber-optic gyroscopes and two accelerometers, the size of the inertial measurement unit is reduced, through the control by a servo motor based on the first fiber-optic gyroscope and the minimum hole inclination servo successive inclinometry method and the control by the servo motor based on the first accelerometer and the maximum hole inclination servo successive inclinometry method, the issues of successive inclinometry of a minimum hole inclination and a maximum hole inclination are solved, the azimuth angle, the maximum hole inclination and the tool face azimuth of a borehole are successively omnibearingly measured, and then the track of the borehole is successively obtained. Meanwhile, the minimum hole inclination servo successive inclinometry method is controlled by the servo motor based on the first accelerometer, so that drifting of gyroscopes caused by successive change of the working face in the process of practical work can be decreased, the measuring error is reduced, the one-time work duration is prolonged, and work efficiency is improved.
Description
technical field [0001] The invention belongs to the field of inertial measurement for oilfield drilling, in particular to an inertial measurement unit and a single-axis servo continuous inclinometer method. Background technique [0002] With the depletion of oil resources, major domestic and foreign drilling companies have set their sights on the exploration and development of complex land conditions such as beaches, lakes, heavy oil reservoirs and oceans. The exploitation of small and scattered oil layers and the increasing number of extended-reach wells, high-deviation wells, cluster wells, and horizontal wells require higher precision and more reliable inclinometers. At the same time, the measurement of azimuth and well deviation is proposed higher requirement. [0003] Traditional oil well inclinometers mostly use fluxgates and mechanical frame gyroscopes to measure well inclinations, but their working accuracy is easily disturbed by external environments, such as magne...
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IPC IPC(8): E21B47/024
CPCE21B47/024
Inventor 缪存孝张贺孙志辉卢明华
Owner UNIV OF SCI & TECH BEIJING