Abstract: A hydraulic jar includes a tubular housing having central bore and an exterior. The housing includes a passage from the central bore to the exterior. A mandrel is axially movable within the housing, forming an annular space between the mandrel and the housing that includes a timing fluid. The mandrel includes an interior axial space that permits the flow of a drilling fluid. A timing device is fixed to the mandrel in the annular space. A trigger is capable of blocking the flow of drilling fluid through the axial space in the mandrel, and the mandrel moves axially in the housing when the trigger engages the mandrel. The timing device causes the mandrel to move at a first speed and at a second speed to create the impulse. The drilling fluid exits the central bore through the opening after the mandrel moves past the opening.

Abstract: A bottom hole assembly is provided, having a housing having a housing lubricant channel; a motor having a rotor and a stator; a mandrel within the housing that rotates when drilling mud flows through the motor; a flex shaft within the housing that includes an internal fluid path for drilling mud to flow into the mandrel; a bushing between the housing and the mandrel having a spiral lubricant channel configured to pump lubricant while the mandrel rotates, such that lubricant in the housing lubricant channel returns to the spiral lubricant channel; first and second on-bottom thrust bearings; and a two stage rotor catch housing attached to the motor and having an internal shoulder, a rotor catch shaft, and a rotor catch nut attached to an upper end of the rotor catch shaft.