Working principle of magnetic positioner.

Working principle of magnetic positioner: The positioner can measure the coupling of casing or tubing because there is a gap in the middle of the coupling, that is, the upper and lower roots of casing or tubing are not in contact, and there is a certain distance between them. Due to the great change of steel thickness, the magnetic flux of the positioner near the joint hoop changes greatly and violently. The specific shape of the measured magnetic positioning curve shows that the curve of the joint hoop position is generally called single peak and single peak in perforation industry. In addition, it seems that the length of casing coupling is generally 25cm-30cm, and that of tubing coupling is about 12- 13cm.

Introduction: magnetic locator is an instrument for measuring the position of casing coupling in borehole. It consists of a permanent magnet and a coil installed in a copper shell.