drilling jars and energizers - Wagenborg

WAGENBORG OILFIELD SERVICES
RUSSIA
“PD” Drilling Jar &
Energizer
NEW GENERATION DRILLING TOOLS

‘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.
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JAR SETTINGS
Please note that all above loads and time delays are approximate only.
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PUMP OPEN FORCE JAR AND ENERGIZER
Pump pressure will generate a force, which will try to open the tool and thereby increase ease of
opening jar lock and increase impact. For calculation please refer to Pump Force table.
In horizontal wells the energizer will, due to the Pump Open Force and spring force, also assist in
moving the BHA to maintain weight on bit.
Pump Open Force Chart
Force created pressure drop across the bit.
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‘PD’ JAR PLACEMENT IN BHA
The ‘PD’ Jar can be placed in the bottom hole assembly either in tension or compression but it is
recommended that the jar is placed as close to any possible stuck point in order to achieve the
highest impact where it counts. Ensure that sufficient weight (hammer weight) is placed above the
jar for high impact.
The energizer should be placed above the jar hammer weight and with sufficient weight above
the energizer in order to ensure high down jar impact.
Never place jar or energizer at the neutral point in string as it may cause excessive wear and/or
damage to the tools.
Never place tools at a transition point (i.e.between 8” (203mm) O.D. and 6 ½” (165mm)
O.D. collars).
Never place jar next to or below a stabilizer, roller reamer or similar tool.
Drill collars and/or pipe connection O.D. above the jar and immediate (1-2 joints) below the jar
should never be larger than the O.D. of the jar.
For dual jar and energizer placement it is recommended that all notes on placement are considered
and that the second jar should be placed higher up in the string again with sufficient hammer
weight to fire up or down as required.
Beware that if weight below the jar is greater than lock setting of the jar, the lock may release
to activate jar hydraulics when string is picked up. Jar can be delivered in open position with a
clamp to eliminate this problem.
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‘PD’ JAR AND ENERGIZER SPECIAL FEATURES
The ‘PD’ Drilling Jar and Drilling Energizer are a new generation of drilling tools designed and
manufactured for the severe drilling conditions of today, such as severe directional and horizontal
drilling conditions.
Ensuring secure and durable operation and providing high impact as and when required, regardless
if in vertical, high angle or the horizontal section of the well.
The ‘PD’ tools feature high strength steel, no chrome exposure either internal or external to drilling
fluids or bore hole. Low internal friction due to design and use
of low friction sealing arrangement.
Large internal diameter for high volume fluid passage has been
achieved without sacrificing tool strength. High impacts even
under low loads which can be increased considerably with
the use of the two stage mechanical ‘PD’ Energizer. Also the
Energizer will absorb shock waves to surface and thereby limit
damage to surface equipment.
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SPECIFICATIONS
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CONTACTS AND SERVICES
SERVICES:
API Machine Shop
Tubular Rental
Down Hole Equipment Rental and Sales
Fishing and Re-entry Equipment
Rentals & Sales
Stabilizers Redress
RCT Services
Handling and Hoisting Equipment Rental
WAGENBORG Oilfield Services, LLC
629800
Panel 8, Noyabrsk, Russian Federation
Tel. +7 3496 354 842
Fax. +7 3496 354 852
info.russia@wagenborg.com
www.wagenborg.com
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