METHOD AND APPARATUS FOR PROTECTING A SENSOR IN A DRILL COLLAR

摘要

A method and apparatus for protecting a sensor from impact and abrasion whil e drilling a borehole including a drill collar having a section of electricall y non-conductive material, such as a composite material. The electrically non- conductive material has a rugged structural strength for conveying required drilling operation torque and load. The sensor which, for example, induces a n RF field, is located inside the drill collar within the section of electrically non-conductive material wherein the sensor is protected from impact and abrasion while drilling a borehole without interference to the electromagnetic energy. The sensor is located, for example, within a load bearing section of the drill collar. Alternatively, the sensor is located inside a removable probe positioned inside the fluid channel through the dri ll collar.