Small-diameter directional gyro inclinometer for drilling

A gyro inclinometer and small-caliber technology, which is applied in the directions of surveying, earthwork drilling and production, wellbore/well components, etc., can solve the problems that cannot be realized, achieve the goal of increasing oil production rate, wide application range, and avoiding blind perforation Effect

Inactive Publication Date: 2011-08-03
CHONGQING HUAYU ELECTRIC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this inclinometer sensor is reliable, it requires that there be no ferromagnetic material around the fluxgate
However, the old well has casing, which cannot provide a good non-magnetic environment for the inclino

Method used

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  • Small-diameter directional gyro inclinometer for drilling
  • Small-diameter directional gyro inclinometer for drilling
  • Small-diameter directional gyro inclinometer for drilling

Examples

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Example Embodiment

[0020] A small-diameter directional gyro inclinometer for drilling, including two parts: an uphole control device and a downhole measurement device; the uphole control device is composed of a computer and a control unit, connected to the downhole measurement device through a cable, and the computer tracks and displays the feedback information of the downhole measurement device in real time . like figure 1 As shown, the downhole measurement instrument includes an inertial sub-joint based on a flexible gyro, related electronic components and a communication module, consisting of a bridle 1, a centralizer 2, an acquisition and telemetry sub-joint 3, a gyroscope inertial sub-joint 4, and a weighted short-circuit 6 , shock absorber 7 and lead shoe 8 to form. The dynamic tuning gyro is composed of the following components: gyro rotor, flexible joint, torquer, sensor, hysteresis motor and sealed shell. A pair of ball bearings are installed on the gyro base to support the high-speed...

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Abstract

The invention provides a small-diameter directional gyro inclinometer for drilling. The small-diameter directional gyro inclinometer consists of an aboveground control device and an underground measurement device. The underground measurement device comprises an inertial short section based on a flexible gyro, wherein the inertial short section of the gyroscope includes a sensor consisting of two small flexible gyros with two degrees of freedom and three orthogonal quartz accelerometers; the two small flexible gyros with two degrees of freedom are orthogonal to each other and are connected with each other through a rotary frame; the three orthogonal quartz accelerometers are connected with one another through the rotary frame; and the gyros and the accelerometers are directly mounted on an inertial body through a location plane to constitute an inertial measurement assembly which is supported on a casing through a pair of bearings. The angles of the inclinometer in the three axial directions can be obtained by resolving an inertial navigation equation during logging so as to obtain the real-time well measurement information and output the azimuth information of an oil well. The small-diameter directional gyro inclinometer has the advantages of small size, low cost, high accuracy, high measurement speed, continuity in measurement, high reliability, high resistance to temperature and pressure, and wide application range.

Description

technical field [0001] The invention relates to a small-diameter directional gyro inclinometer for petroleum logging and geological exploration. [0002] Background technique [0003] Directional drilling is one of the important technologies for oil and gas development, and it has been applied in some developed countries abroad. The inclinometer and direction instrument used in directional drilling include various magnetic instruments and frame type gyro instruments. However, the measurement of small-diameter drilling has not met the requirements. Especially in our country, the magnetic instruments (such as fluxgates) which are still widely used in our country are affected by the geological environment and the surrounding ferromagnetic material environment, so the measurement accuracy is very low, and they cannot even be used. The general frame-type gyro instruments not only have low accuracy, but also have large diameter , using front-to-back alignment, calibration is al...

Claims

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Application Information

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IPC IPC(8): E21B47/12E21B47/022
Inventor 谢箭夏明泽林萍王福亮李红良
Owner CHONGQING HUAYU ELECTRIC GRP
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