Mechanical directional drilling jar

Details Mechanical directional drilling jar Mechanical directional drilling jar

E - Fixed Constructions

21

B

255/29

E21B 31/107 (2006.01) E21B 7/04 (2006.01)

Patent

CA 1281025

ABSTRACT MECHANICAL DIRECTIONAL DRILLING JAR A drilling jar is disclosed. The jar has particular application in directional drilling operations and in- cludes a swivel which allows the drilling jar to operate substantially independently of any right hand torque that becomes trapped in the drill string. The swivel includes a bearing cage that engages the polished stem of the drilling jar to the jay stem of the drilling jar. This bearing cage holds a number of bearings against the jay stem and the polished stem. The swivel allows the jay stem to rotate substantially independently of the polished stem. The drilling jar may further include splines formed onto the outer surface of the polished stem for trans- mitting torque from the polished stem to the barrel of the drilling jar without simultaneously transmitting torque from the polished stem to the jay stem. In addition, the drilling jar may include floating pistons that are circum- ferentially engaged to the polished stem and the washpipe that effect the upper and lower seals on the drilling jar and allow the internal pressure inside the tool to be equalized with the internal and external pressures of the drill string.

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