Research and implementation of a new orientation & incline instrument used in oil and gas wells

A new type of oil and gas wells' orientation & incline system which is constituted of fiber optic gyroscope and MEMS accelerometer has been introduced. And the system scheme , methods of dynamic north-seeking and algorithm have been given. By the introduction of low-speed continuous rotation, the adoption of dynamic rotation mode and the using of inertial system's own output signal , the lowfrequency random drift error of fiber-optic gyro is decreased, and ultimately this instrument can achieve the oil and gas wells' geographic north & Incline angle of probe quickly and accurately. The experimental results show that: the system's orientation precise is within ±1 °, and the level precise is within ±0.1°.Besides, the system has the advantage of having solid structure,stand high temperature, high shock above 100g , more than 3000h of MTBF, more than 10 years of life expectancy. It is suitable for all-weather field environment, and is the ideal next-generation oil and gas wells' orientation & Incline measurement instrument. ©2009 IEEE.