Double action
drilling jars

Sales, rental and services

Wagenborg Oilfield Services offers PD double acting drilling jars rentals and sales. These jars are proven to be one of the leading jars worldwide. PD jars can be used both as a single shock tool in the string and in assembly with the PD energizer and bumper sub. This type of jar does not have a silicone section which allows to use it much longer during operation.

We can guarantees jar operation for 350 circulation hours and 350 drilling hours in standard temperatures. The jar does not have any chromated or polished surfaces which makes it exceptionally damage resistant. Wagenborg Oilfield Services is the only company in Russia which can offer a double acting drilling jar with OD 4 1/8” (105mm). This size is optimal for jobs in 5 3⁄” (146mm) casing, because such jars are fishable in this size of casing.

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.