Near-bit orientation dynamic measurement device and measurement method

Abstract

The invention provides a near-bit orientation dynamic measurement device and measurement method. The component of the gravity acceleration is measured through an accelerometer in the axial direction of a drilling toll, the component of the geomagnetic field is measured through a magnetometer in the radial direction of the drilling tool, and according to the strength of the local geomagnetic field, the magnetic inclination and the gravitational field overall strength data, the dynamic orientation angle is calculated. Compared with a traditional measurement while drilling (MWD), the method does not measure the geomagnetic field component in the axial direction of the drilling toll and the gravitational field component in the radial direction of the drilling toll, and the influence of the axial magnetic disturbance generated through drilling tool magnetization on the axial geomagnetic field component measuring and the influence of the centrifugal acceleration and radial vibration which are generated through rotating on the gravitational field component measuring are avoided so that dynamic measurement of the orientation angle in the drilling process can be achieved. According to the orientation dynamic measurement device, the number of used sensors is reduced to be three from six, the installation space is saved, power consumption of the sensor part is reduced, and the orientation dynamic measurement device is particularly suitable for requirement sensitive occasions of the installation size and power consumption during near-bit measuring.

Description

technical field [0001] The invention provides a drilling azimuth measurement method used in the exploration and development of underground resources such as oil, natural gas, and geothermal heat, and particularly relates to a device and method for realizing dynamic measurement of azimuth near a drill bit during drilling. Background technique [0002] With the continuous deepening of oil and gas exploration and development, there are more and more difficult directional wells such as horizontal wells, extended reach wells, and lateral wells. Directional drilling technology provides new technical means for expanding the exploration field and efficiently developing oil and gas resources. Directional drilling refers to the drilling technology method of drilling to the target layer according to the pre-designed trajectory with well deviation and azimuth change. The pre-designed well trajectory is often a straight line or a smooth curve, but affected by formation anisotropy, directi...

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Problems solved by technology

[0009] Chinese patent CN200520032626.7 discloses a device for measuring the inclination angle near the drill bit while drilling, but only measures the inclination angle through the acceleration sensor, does not involve the measurement of the azimuth parameters near the drill bit, and does not consider the influence of the radial accelerometer measurement results

Chinese patent 201110459707.5 discloses a device for measuring directional parameters near the drill bit while drilling, but only the well inclination sensor is used to measure directional parameters, wh...

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