drilling jars and energizers - Wagenborg

‘PD’ DRILLING JAR OPERATION
Jarring Up
To jar up apply overpull at the jar as required and wait for jar to fire,
lock will automatically release when lock setting load is exceeded. The
more overpull applied on the jar, the greater impact will be achieved.
To repeat jarring, reset jar into locked position by applying weight on
the jar which then automatically will return to it’s locked position and
again be ready to be fired up or down as required. Jar lock load will
have to be exceeded for the lock to release and hydraulics to be engaged.
Overpull in excess of Max Pre-Jarring should not be applied as it
may damage the hydraulics of the jar.
Jarring Down
To jar down, apply weight on the jar as required and wait for jar to
fire, the lock will automatically release when lock setting load is exceeded.
The more weight applied on the jar, the greater impact will be
achieved.
To repeat to jarring, reset jar into locked position by applying overpull
at the jar which then automatically will return to it’s locked position and
again be ready to be fired up or down as required. Jar lock load will
have to be exceeded for lock to release and hydraulics to be engaged.
Energizer Up and Down Operation
The energizer will automatically be applied when opening the jar so
fully concentrate on the loads applied on the jar and the energizer will
adjust as required.
The energizer will, when operated with the ‘PD’ Jar, increase acceleration
of hammer weight between jar and energizer and thereby increase
impacts. The impacts will also due to the two-stage design increase impacts
in horizontal wells. This double action energizer will also minimize
jarring shock loads on working string and topside equipment.
WAGENBORG OILFIELD SERVICES