Bumper sub:

The bumper sub body moves up and down on a mandrel.

Terms Related to Bumper sub

• Bumper jar

  A device made up in the drill string that, when actuated, delivers a heavy downward blow to the string. A bumper jar has a hollow ...

• Free-point indicator

  A device run on wireline into the wellbore and inside the fishing string and fish to locate the area where a fish is stuck. When ...

• Mechanical jar

  A percussion tool operated mechanically to give an upward thrust to a fish by the sudden release of a tripping device inside the tool. If ...

• Safety joint

  An accessory to a fishing tool, placed above it. If the tool cannot be disengaged from the fish, the safety joint permits easy disengagement of ...

• Fishing string

  An assembly of tools made up on drill pipe that is lowered into the hole to retrieve lost or stuck equipment. Also call a fish ...

• Fishing

  The procedure of recovering lost or stuck equipment in the wellbore. See fish.

• Overshot

  A fishing tool that is attached to tubing or drill pipe and lowered over the outside wall of pipe or sucker rods lost or stuck ...