Continuous gyroscopic survey system for directional well

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...

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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 rate of the instrument. The measurement of foreign small and high-precision mechanical gyroscopes is embargoed domestically, and domestic demand cannot be met

[0005] Although the fiber optic gyroscope in the fiber optic gyroscope inclinometer has a solid structure and has the advantages of high reliability, impact resistance, low power consumption and large dynamic range, it also has the disadvantages of large size and easy to be affected by temperature. Meet current inclinometer requirements

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