MEMS gyroscope measurement is a common measurement method in oil drilling field, which is also the industry with the harshest working environment. In the construction of cluster well groups, due to the influence of magnetic interference between wells, MWD inclination data errors are large, and the products are also easily affected by drill string impact and vibration. This type of abuse will cause excessive wear and premature failure of the system, resulting in costly maintenance or downtime. MEMS are typically smaller, consume less power and cost less than equivalent discrete sensors. For example, the MG2-50/100 （https://www.ericcointernational.com/gyroscope/mems-gyroscope/er-mg2-100-north-seeking-mems-gyro.html) has a volume of only 11 x 11 x 2 mm, its bias instability is also 0.01 to 0.02°/h, and it has an angle random walk of 0.0025 to 0.005°/√hr, which can measure Angular velocity up to ±100°/s. Additionally, they enable signal conditioning circuitry to be integrated into the same sized semiconductor package.
MEMS technology uses the internal vibration structure to determine the rotation speed, and then determine parameters such as well inclination, orientation, tool face, etc., overcoming the influence of the Coriolis force effect and increasing the well speed. Compared with mechanical gyroscopes, MEMS gyroscope is designed with solid-state sensors that can withstand extreme conditions such as downhole shock and vibration, require no recalibration during use, and consume less energy. The same battery can last longer. The field application of the instrument shows that MEMS gyro MWD can meet the accuracy requirements required by today's complex drilling environment, and when used in conjunction with MWD measurement tools, the uncertainty can be reduced by 45%, which is conducive to accurate measurement, control the trajectory and hit the target.
MEMS gyroscope uses the internal vibration structure to determine the drill bit speed, and then determine the well inclination, orientation, tool face and other parameters to achieve real-time monitoring of the well trajectory and drill bit position to ensure that the well depth reaches the predetermined position. Unlike traditional sensors, MEMS gyroscope has obvious advantages: compared with discrete sensor, MEMS gyroscope is smaller, consume less power, and cost less. At the same time, compared with mechanical gyroscope, MEMS gyroscope can withstand extreme conditions such as downhole shock and vibration, do not require recalibration during use, and consume less energy.

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