Continuous gyroscopic survey system for directional well

A directional well and gyro technology, which is used in surveying, wellbore/well components, earth-moving drilling, etc., can solve the problems of small wellbore volume of directional wells, inability to meet domestic needs, and inability to meet inclination measurement requirements, etc. Measurement accuracy and efficiency, low cost, small size effect

Active Publication Date: 2012-07-11
CHINA OILFIELD SERVICES +1
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  • Abstract
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Problems solved by technology

[0003] The fluxgate inclinometer has the advantages of simple structure, low price, and stable performance. However, this instrument cannot measure oil wells with magnetic interference such as directional wells.
[0004] The mechanical gyro inclinometer can make up for the above-mentioned shortcomings of the fluxgate inclinometer. However, the borehole volume of the directional well is small. At present, there is no miniaturized and accurate mechanical gyro in China to realize the axial angular

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  • Continuous gyroscopic survey system for directional well
  • Continuous gyroscopic survey system for directional well
  • Continuous gyroscopic survey system for directional well

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Embodiment Construction

[0022] Such as figure 1 As shown, the directional well continuous gyro inclinometer system of the present invention comprises a computer 10, a control box 20 and an inclinometer 40. The computer 10 and the control box 20 are placed on the ground, and the inclinometer 40 is placed in the downhole for measurement. The serial port of the computer 10 Connect with the communication port of the control box 20, the cable interface of the control box 20 is connected with the end of the inclinometer 40 via the kilometer cable 30, the control box 20 is used to amplify the power of the control signal of the computer 10 and couple it to On the cable 30 , it is transmitted to the downhole equipment. In addition, the control box 20 can modulate, filter and compare the received acquisition signal from the downhole equipment, so as to finally transmit the decoding result to the computer 10 . Such as figure 1 , the inclinometer 40 includes a cable head 41, an upper centralizer 42, an instrume...

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Abstract

The invention discloses a continuous gyroscopic survey system for a directional well. The system comprises a computer, a control cabinet and an inclinometer, wherein a serial port of the computer is connected with a communication port of the control cabinet; a cable interface of the control cabinet is connected with the end part of the inclinometer through a cable; the inclinometer comprises a cable head, an upper centralizer, an instrument short section, a lower centralizer, a weight bar, a vibration damper and a guiding shoe which are connected with one another sequentially; and a connecting end of the cable head is connected with the cable. The system can continuously measure a well track in an all-dimensional mode, has high measurement accuracy and high efficiency, and can be used in directional drilling and the measurement of the well track.

Description

technical field [0001] The invention relates to a directional well continuous gyro inclination measuring system realized based on inertial technology, and belongs to the technical field of directional wells in the petroleum industry. Background technique [0002] The inclinometer is a widely used measurement tool for borehole trajectory measurement in oil and gas wells and coal mines. At present, most of the methods at home and abroad use the combination of fluxgate sensor, mechanical gyroscope or fiber optic gyroscope and accelerometer to measure the azimuth angle, inclination angle and tool face angle of the borehole. [0003] The fluxgate inclinometer has the advantages of simple structure, low price and stable performance. However, this instrument cannot measure oil wells with magnetic interference such as directional wells. [0004] The mechanical gyro inclinometer can make up for the above-mentioned shortcomings of the fluxgate inclinometer. However, the borehole volu...

Claims

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Application Information

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IPC IPC(8): E21B47/022
Inventor 缪存孝曹阳吴彦博高瑞兰
Owner CHINA OILFIELD SERVICES
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