ANTIFRICTION TOOL AND ITS APPLICATION

Decrease of friction is very important technique question in extended reach well drilling, and application of antifriction tool is the effective way to settle this question. This study introduces the construction, mechanism of reduce torque and antifriction, application method, announcement items and application effect of the non rotational drill pipe protector (NRDPP) especially. We introduce the structure and characteristic of the torque drill pipe, DSTR nipple joint, lower torque drill pipe simply.