Recently, CCTEG Xi'an Research Institute has made a major breakthrough in the application of inertial navigation technology, successfully independently developed two inertial navigation-based trajectory measurement devices while drilling, respectively YSX1-2000 mine fiber optic gyro wire measurement while drilling device and YSX2-2000 mine MEMS gyro wire measurement while drilling device. The two devices have been successfully tested in the field at Zhashui Test Base, marking a new breakthrough in the field of trajectory measurement while drilling technology.
For a long time, because of its special application environment, coal mine drilling track measurement relies too much on geomagnetic field measurement in azimuth measurement, resulting in casing drilling, metal mines, railway tunnels and other environments can not be applied, and the measurement also has a certain lag, and the mathematical calculation conversion process is also prone to errors. In order to solve this problem, CCTEG Xi'an Research Institute takes the market as the orientation and the customer as the center, concentrates on tackling the technical bottlenecks in the key core fields of the country and the industry, and applies the inertial navigation technology to the drilling trajectory measurement. Inertial navigation system is an autonomous navigation system that does not rely on external information or radiate energy to the outside. It has the characteristics of being free from external electromagnetic interference, low signal noise and strong environmental adaptability.
Two kinds of track measurement devices based on inertial navigation successfully overcome the existing drilling track measurement system susceptible to ferromagnetic environment, there is no need to install costly up and down non-magnetic and non-magnetic drill pipe in the construction process, and improve the problem of measurement lag, improve the accuracy and adaptability of measurement; It overcomes the problem of borehole track measurement in coal mine for a long time.
In addition, in view of the problems of high power consumption of fiber optic gyro that does not meet the requirements of coal mine safety and poor shock resistance of MEMS gyro that does not adapt to the vibration environment measurement while drilling, YSX1-2000 mining fiber optic gyro and YSX2-2000 mining MEMS gyro are constantly explored in miniaturization and low power design. Combined with the requirements of the MWD system for shock resistance, water pressure resistance and disturbance resistance, the structural optimization design was carried out, and the inertial navigation technology was introduced into the drilling trajectory measurement to realize the azimuth measurement.
The successful application of the field test breaks the situation of relying on magnetic sensor to measure the azimuth in the traditional drilling track measurement, and improves the accuracy of the drilling track azimuth measurement, which marks the drilling track measurement system in China has entered a new era, and can provide reliable data support for the field of intelligent directional drilling technology and geological support. Promote the application of directional drilling products in non-coal mine and ground tunnel exploration and other fields.
