A kind of gravity acceleration measurement device and extraction method in rotating state

Abstract

The invention provides a gravity acceleration measurement device and an extraction method in a rotating state. The device includes a sensor and a measurement circuit, the sensor includes a three-axis gravity accelerometer, a reference measurement sensor and a temperature sensor, the three-axis gravity accelerometer measures acceleration component signals in three orthogonal directions, and the reference measurement sensor generates A signal that changes and is not affected by vibration and shock is used as a reference signal; the temperature sensor measures the temperature inside the device, which is used for temperature compensation of the gravity accelerometer; the measurement circuit collects the output signal of the sensor, and the reference signal is respectively compared with the acceleration Correlation processing is carried out on the counting components to extract the gravitational acceleration signal, so as to eliminate the centrifugal acceleration, vibration and impact interference caused by the rotation. facial angle.

Description

technical field [0001] The invention mainly belongs to the field of oil drilling measurement while drilling, and in particular relates to a gravity acceleration measurement device and an extraction method in a rotating state. Background technique [0002] Measurement while drilling refers to the process of measuring wellbore trajectory parameters in real time during the drilling process, and using drilling fluid, electromagnetic waves, etc. as media to transmit information to the surface. Measuring-while-drilling instruments are the "eyes" of directional drilling engineers and an essential tool for controlling wellbore trajectory. In the process of directional drilling, the direction information of the drill bit is crucial to the correct drilling. Accurate measurement of the direction of the drill bit can not only ensure the efficient drilling of the target, but also avoid the risk of collision with the adjacent wellbore. Therefore, in addition to the traditional bottom hol...

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Problems solved by technology

But the disadvantage is that it can only be measured intermittently at a certain distance. In practical engineering applications, it is usually measured every 30 meters. The borehole trajectory between the measurement points can only be calculated by mathematical methods, so it is impossible to obtain accurate boreholes. track information

At the same time, due to the static measurement, the drilling operation must be stopped frequently, especially in the directional well section, which seriously affects the drilling efficiency. In addition, the drilling stoppage will also affect the stability of the well wall. torque, which brings a series of problems to drilling safety

In recent years, the development of horizontal wells in unconventional oil and gas resources such as shale gas, fine mining in the late stage of mature oilfield development, and development of thin and ultra-thin (less than 1 meter) oil and gas reservoirs require higher and higher trajectory control accuracy. Intermittent measurement mode with MWD is difficult to meet the requirements

[0004] There is a contradiction between the number of trajectory measurement points and measurement efficiency of the existing MWD system stop-drilling measurement. Dynamic continuous measurement of borehole trajectory has become the development trend of directional drilling measurement. Three-axis gravitational accelerometers are installed near the drill bit to measure the inclination angle and tool face angle, but the measurement accuracy is still far behind that of conventional MWD

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