Title:
DEVICE FOR MEASURING GRAVITATIONAL ACCELERATION DURING STATE OF SPINNING AND EXTRACTION METHOD
Document Type and Number:
WIPO Patent Application WO/2018/040288
Kind Code:
A1
Abstract:
A device for measuring gravitational acceleration during a state of spinning, and an extraction method. The device comprises a sensor and a measurement circuit. The sensor comprises a tri-axial gravitational accelerometer, a reference measurement sensor, and a temperature sensor. The tri-axial gravitational accelerometer measures acceleration component signals of three orthogonal directions. The reference measurement sensor generates a reference signal changing with a spinning motion but not influenced by a vibration or impact. The temperature sensor measures an internal temperature of the device for temperature compensation of the gravitational accelerometer. The measurement circuit collects an output signal from the sensor, and respectively performs, by means of a reference signal, relevant processing of an accelerometer component to extract a gravitational acceleration signal, thereby eliminating interferences such as centrifugal acceleration, vibration, and impact arising from a spinning motion. An interference-free gravitational acceleration obtained by using a measurement method provided by the invention can be used to calculate a well inclination and a toolface angle.
Inventors:
ZHANG WENXIU (CN)
CHEN WENXUAN (CN)
DI QINGYUN (CN)
LIU JIANGUANG (CN)
SUN YUNTAO (CN)
YANG YONGYOU (CN)
ZHENG JIAN (CN)
CHEN WENXUAN (CN)
DI QINGYUN (CN)
LIU JIANGUANG (CN)
SUN YUNTAO (CN)
YANG YONGYOU (CN)
ZHENG JIAN (CN)
Application Number:
PCT/CN2016/105547
Publication Date:
March 08, 2018
Filing Date:
November 12, 2016
Export Citation:
Assignee:
INST GEOLOGY & GEOPHYSICS CAS (CN)
International Classes:
E21B47/022; E21B47/024
Domestic Patent References:
| WO2010091239A2 | 2010-08-12 |
Foreign References:
| CN206091970U | 2017-04-12 | |||
| CN105180889A | 2015-12-23 | |||
| CN104500036A | 2015-04-08 | |||
| US4362054A | 1982-12-07 | |||
| CN102066875A | 2011-05-18 |
Other References:
See also references of EP 3312382A4
Attorney, Agent or Firm:
BEIJING JINZHIPUHUA INTELLECTUAL PROPERTY AGENCY CO. LTD et al. (CN)
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