The swivel joint is typically used to decrease the torque on slickline or wireline during downhole operations.

Applications:

Paddle broaches use rows of teeth to remove scale, debris, or deformations from the inside of the tubing string.

Paddle type broaches can be used to remove scale, asphaultines, sulfur build ups, 

or deformations on the inside of the tubing string.

Broaches are typically ran in preparation for equipment such as plunger lift systems, or logging operations.