Continuous gyro measuring device

Abstract

The invention belongs to the technical field of petroleum downhole instruments, and relates to a continuous gyro measuring device. Thecontinuous gyro measuring device comprises a circuit module, a transmission module, a gyro movement, a fixing module and a protection module. The circuit module comprises a circuit board bracket, a fiber-optic gyroscope control panel, a carrier communication circuit board, a fiber-optic gyroscope power panel, a fixed micro-distance socket and a micro-rectangular connector socket; the transmission module comprises a two-phase stepping motor, a motor protection sleeve, a motor support, a first bearing sleeve, a shaft sleeve, a first deep groove ball bearing, a counter-rotating shaft, a limiting shaft, a transmission shaft, an elastic coupler, an adapter plate and an accelerometer, and the fixing module comprises a centralizing sleeve, a plug, a second bearing sleeve, a second deep groove ball bearing, a wave spring and a plug. The protection module is composed of a circuit outer cylinder and a sensor outer cylinder. According to the continuous gyro measuring device, high-efficiency and high-precision north-seeking measurement and continuous mode measurement can be realized under the condition that the well inclination is 0-90 degrees, and the well logging trajectory is calculated in real time.

Description

technical field [0001] The invention belongs to the technical field of petroleum downhole instruments and relates to a continuous gyro measuring device. Background technique [0002] Fiber optic gyro is an optical angular rate sensitive element based on the Sagnac effect. The fiber optic gyro inclinometer based on the fiber optic gyro is an important measuring instrument used in the field of petroleum logging. The fiber optic gyroscope is used to measure the rotation of the earth, and the acceleration sensor is used to measure the earth's magnetic field. The system combination of the acceleration sensor and the fiber optic gyroscope can measure various logging parameters such as well deviation, azimuth, and tool face. In actual application, the conventional gyro inclinometer has the following disadvantages: 1) the measurement speed is slow, and each measurement point takes more than 1 minute, which will increase the logging time. In the field of oil drilling, the cost is hig...

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Problems solved by technology

In actual application, the conventional gyro inclinometer has the following disadvantages: 1) the measurement speed is slow, and each measurement point takes more than 1 minute, which will increase the logging time. In the field of oil drilling, the cost is highly sensitive to time, and the increase of time will Greatly increase the cost of customers; 2) Due to the long measurement time, it is not conducive to the measurement of deep wells and high-temperature wells, especially limiting the application of measuring instruments in high-temperature application environments; 3) The measurement is very sensitive to vibration and must be absolutely static. In the actual measurement, it may be necessary to perform multiple remeasurements at the same position due to interference, which increases the measurement time; 4) The conventional gyro measurement attitude is limited. When the inclination angle is greater than 60°, the measurement error is large

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