Measurement while drilling

In modern oil and gas drilling several holes are drilled from a drilling platform, especially in the offshore sector. In order to avoid collisions of the individual holes, it is necessary to determine the exact course of the individual holes. Because of the deflection of the earth's magnetic field by means of an ground located in the casing tubes, it is not possible to perform these measurements through a magnetic compass. One uses this gyros or, more recently, inertial navigation systems, which are usually discharged at a measuring cable into the hole. Gyros transfer direction and inclination of the bore to the surface, where it is the trajectory of the borehole is calculated. Inertial navigation systems directly compute their distance traveled by double integration of the acceleration values ​​and the direction by integrating the measured angular rate gyroscopes through.

• Erdbohrtechnik