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O n e C o m p a n y U n l i m i t e d S o l u t i o n s
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rSURFACE BUMPER JARInstruction Manual 4300
Surface Bumper JarGeneral Description ..................................................... 3Use ............................................................................... 3Construction ................................................................ 3Explanation of Mechanism .......................................... 4Operation ..................................................................... 4
To Free a Stuck Drill String ...................................... 4To Accuate a Bumper Sub ...................................... 5To Release a Fishing Tool ........................................ 5Precautions ............................................................. 5Illustration of Bowen Surface Bumper Sub ....... 3 & 6
Maintenance ................................................................ 5Complete Disassembly ........................................... 5Complete Reassembly ............................................ 6
Calculated Strength Data ............................................ 7Specifications and Replacement Parts ........................ 8
I N
D E
XSurface Bumper Jar
The designs and specifications for the tools described in this
instruction manual were in effect at the time this manual was
approved for printing. National Oilwell, whose policy is one
of continuous improvement, reserves the right to discontinue
models at any time, or to change designs and specifications
without notice or without incurring obligation.
Eighteenth Printing, November 2003
3
General DescriptionThe Bowen Surface Bumper Jar isespecially designed and engineered tobe installed in the drilling string at thesurface. Its presence permits the oper-ator to deliver sharp descending impactsor (downward) jarring blows against thefish at its stuck-point. By a simple adjust-ment, the Bowen Surface Bumper Jarmay be set to deliver very light blows ofvery high impact.
UseThe Bowen Surface Bumper Jar may beused to great advantage in any situationwhere the downhole running string(drilling, fishing or washover) becomesstuck, and a heavy downward blow isrequired to release it. The Bowen SurfaceBumper Jar is often used to free keyseated drill pipe and drill collars.
It is also used to initiate abrupt jarringblows down the string to actuate DrillingBumper Subs, Bumper Safety Joints andother similar downhole bumping tools.
The Bowen Surface Bumper Jar is parti-cularly useful for transmitting very heavydownward blows to effect the release ofgrappling tools such as Overshots orSpears, in situations where the grapplesor slips have become imbedded in thefish, or become fouled due to repeatedand prolonged downhole jarring.
In many instances, the Bowen SurfaceBumper Jar has been successfullyutilized, where all previous methodsfailed.
ConstructionBasically, the Bowen Surface Bumper Jaris composed of a Mandrel Assemblywhich works in conjunction with a BowlAssembly.
The Mandrel Assembly is composed of aTop Sub, Mandrel and Friction Mandrel.
The Bowl Assembly consists of a Bowl,Bowl Extension, Bottom Sub, KnockerSub, Friction Slip Spacer, Control Ring,Control Ring Plug, Seal Insert and Wash-pipe.
The Washpipe, which is connected tothe Bottom Sub and moves inside of theMain Mandrel, is sealed from the MainMandrel by the Seal Insert confining thewell fluids within the Washpipe and outof the restraining mechanism within theBowl.
The Main Mandrel, which is hexagon inshape, fits into a correspondinglyshaped bore in the Knocker Sub, whereit is continuously capable of transmittingtorque, while also free to move up anddown over its entire 48" stroke.
Control of the Bowen Surface BumperJar is exercised by the action of therestraining mechanism of the FrictionMandrel, the Friction Slip, the FrictionSlip Spacer and the Control Ring. TheTonnage (the striking force of the jar) isadjusted by setting the Control Ring.
Top and Bottom Subs are furnished witha 5-1/2" F.H. connection. The Top Sub isa box connection and the Bottom Sub isa pin connection. A lifting sub is providedfor the top connection for the purpose oftransporting and/or lifting the Surface Jar.
Bowen Surface Bumper Jar
4
Explanation of MechanismReferring to the illustration on page 5,it can be seen that the Friction Slip isrestricted within the tapered bowl by theControl Ring. Turning the Control Ring tothe right or to the left moves the FrictionSlip up or down the taper, thereby eitherincreasing or decreasing its ability toexpand. There are internal Rings (raisedareas) within the Friction Slip which mustpass over the external Rings (raisedareas) of the Friction Mandrel in orderto pull the Jar into its open position andto produce the jarring blow.
When the Surface Bumper Jar is beingopened or tripped, the Friction Mandrelpulls the Friction Slip into a reducedsection of the taper in the Bowl andagainst the bottom of the Control Ring.Hence, depending upon the position ofthe Control Ring, only a slight pull or apull of many tons is required to open thejar.
When the Surface Bumper Jar is installedat the surface and a straight upwardpull is exerted against it, the Friction Slipfrictions upon the enclosed frictionMandrel and arrests upward movementwhile the drill pipe is being stretched.When the upward pull reaches the pre-set tripping tonnage, the Friction Mandrelis pulled through the Friction Slip. Theresultant downward surge of the drillpipe in returning to its normal lengthcauses a sudden separation of the MainMandrel and Bowl assemblies which arefree to move apart for the length of its48-inch stroke and drive the weight of thefree pipe against the point where the fishis stuck.
When the Surface Bumper Jar is beingclosed, the Friction Mandrel pushes theFriction Slip into the enlarged section ofthe taper in the Bowl and then slideseasily through it.
The Control Ring Plug has a projectionon its inner end which engages a slot inthe Control Ring and prevents it fromturning. Removing the Control Ring Plugfrom the Bowl exposes a port throughwhich the Control Ring may be turnedwith a Control Ring wrench.
Turning the Control Ring to the rightmoves it upwardly, in turn, moving theFriction Slip into the smaller diameter ofthe tapered bowl, therefore constrictingthe rings more and requiring more tonsto open the jar. The words “More Tons”are stamped on the right side of theControl Ring Port.
Turning the Control Ring to the left movesit downwardly, in turn, moving the FrictionSlip into the larger diameter of thetapered bowl, therefore expanding therings more and requiring less tons toopen the jar. The words “Less Tons” arestamped on the left side of the ControlRing Port.
NOTE: The Surface Bumper Jar should
be pulled open at the rig site before it is
brought from the field to be serviced.
OperationIn all types of jarring operations, theBowen Surface Bumper Jar is installedin the drilling string or fishing string justabove the rotary table, or at the jointnearest the table. If circulation is desired,connect the kelly to the top the jar. If cir-culation is not required, connect a singlejoint of pipe above the jar. Sufficientweight (300 to 400 lbs.) should be runabove the jar to close and re-set it.
Always begin jarring operation with aLIGHT tonnage, gradually increasing thetonnage as the operation proceeds. Setthe restraining mechanism to lighttonnage by adjusting the Control Ringas indicated by the stencil on the Bowlat the Control Ring Plug.
To adjust the Control Ring, remove the Con-
trol Ring Plug and then, using the Control
Wrench, rotate the Control Ring to the
RIGHT to increase the tripping tonnage
or to the LEFT to decrease the tripping
tonnage.
Take an upward strain on the BowenSurface Bumper Jar. When the upwardstrain is equal to the previously set ton-nage, the restraining mechanism willrelease and allow the Bowl Assemblyto descend rapidly with respect to theMandrel Assembly for 48 inches. This willcause the weight of the stretched pipeto fall downward against the stuck fish.
To Free a Stuck Drill String
Drill Strings frequently stick on the tripout of the hole by pulling into a keyseat.Install the Bowen Surface Bumper Jarin the drill string as explained above.Set the Jar for light tonnage and beginjarring operations, gradually increasingthe tonnage as jarring proceeds, untilthe drill pipe is free.
CAUTION: Do not set the tripping tonnage of
the Jar higher than the weight between the
surface and the point where it is stuck. If
the tripping tonnage is set higher than the
weight of the amount of free pipe above the
stuck point, it will result in the pipe being
pulled tighter into the keyseat.
Do not use a load setting that will create a
stretch in the drill string that is greater than
the stroke of the jar. This could cause an
impact within the jar and possibly damage
the hook or other rig components.
Be aware that a sudden freeing of a heavy
fish will allow the fish to drop and strike a jarring
blow with the jar. This could also damage the rig.
A similar procedure is observed in allcases of stuck pipe.
5
To Actuate a Bumper Sub
Many drilling operators employ DrillingBumper Subs in the drilling string. Also,almost all fishing operators install aBumper Sub above engaging tool in afishing string. When the String, in eithercase, becomes stuck and the BumperSub is ineffective, install a BowenSurface Bumper Jar in the string asexplained above.
Set the Surface Bumper Jar for light ton-nage, just enough to open the BumperSub. Thereafter, gradually increasetonnage but observe the precaution citedabove and do not set the tripping ton-nage so high that it exceeds the weightof the free pipe above the stuck point.Continue jarring with the Surface BumperJar until the stuck string is free.
To Release a Fishing Tool
Occasionally, fishing tools or grapplingtools such as Overshots or Speaks can-not be released by the normal procedureof bumping down with the weight of thefishing string. This is usually the result ofthe Grapple or the Slips having becomeimbedded in the fish or having becomefouled due to repeated and prolongedbumping and jarring on the fish.
In such cases, install a Bowen SurfaceBumper Jar in the fishing string asexplained above. Set the tonnage at amedium tonnage but do not exceed theweight of the free pipe below the SurfaceBumper Jar. If there is a Bumper Sub inthe string, set the tonnage high enoughto insure that the Bumper Sub is pulledinto its fully open position. Open theSurface Bumper Jar to effect the releaseof the Grappling tool. This will usuallyrequire only one or two blows.
Precautions
Always begin Surface Bumper Jar oper-ations with the Jar set for LIGHT jarring,gradually increasing tonnage as jarringoperations proceed.
Avoid setting the tonnage of the SurfaceBumper Jar to exceed the weight of thefree pipe between the Jar and the stuckpoint. This will usually result in defeatingthe purpose of the Jar and may stick thepipe tighter.
Occasionally, the Bowen SurfaceBumper Jar may become “half-cocked”— where the Jar is neither fully openednor fully closed. This situation resultsfrom having set the tripping tonnageso high that there is insufficient pullingpower to trip the Jar and the weight ofthe pipe above the Jar is insufficient toclose it.
It is then necessary to break the Jar outof he string, protect the pin connectionthread on the bottom, and strike the Jarsharply against some solid object untilthe Jar is closed. Then, the Control Ringmay be adjusted for less tripping ton-nage and the operation resumed.
NOTE: It is important that the Surface
Bumper Jar be opened at the rig site before
it is brought in from the field for servicing.
MaintenanceThe Bowen Surface Bumper Jar normallyrequires very little maintenance. Aftereach use, it should be thoroughly rinsedout with clear water to remove any dril-ling fluid that may have been circulatedthrough it. The Jar should be openedso that the surface of the hexagon MainMandrel may be lubricated with a goodgrade of heavy weight oil or grease. Afterlubricating the Main Mandrel, the Jarshould be set to minimum tonnage andthen closed. The exterior surface may bepainted or lubricated to prevent any rustor deterioration.
DisassemblyComplete disassembly of the BowenSurface Bumper Jar should proceed asfollows:
1. Secure the tool in a suitable vise,clamping it at the Bowl. Do not clampon the Control Ring Plug.
2. Loosen the Bottom Sub in the Bowl.Remove the Bottom Sub and Wash-pipe as a unit and lay them aside.Since the Washpipe is tightened intothe Bottom Sub, they will remainattached.
3. Remove the Friction Slip spacerfrom the lower end of the Bowl.
4. Remove the Control Ring Plug androtate the Control Ring to minimumtonnage position as far as it will go,if this has not previously been done.
5. Slide the Mandrel out far enough topartially open the Jar, releasing theFriction Mandrel from the FrictionSlip.
6. Remove the Friction Slip from theinside of the Bowl.
7. Re-clamp the tool, clamping on theBowl Extension.
8. Break loose and remove the FrictionMandrel from the Main Mandrel. Usethe wrench Flats provided on thelower end of the Friction Mandrel toremove it. DO NOT APPLY AWRENCH TO THE FINISHED SLIPSURFACE!
9. Remove the Packing Set from theinside, lower end of the Main Man-drel. A screwdriver with a bent endwill aid the operator to reachthrough the bore of the Packing Setand pull it out.
10. Break out and remove the Top Sub.
6
Bowen Surface Bumper Jar
Top Sub
Knocker Sub
Bowl Extension
Bowl
Bottom Sub
ChevronPacking
Friction Slip
ControlRing Plug
11. Slide the Mandrel down through theKnocker Sub and Bowl Extension toremove it. Lay it aside.
12. Thoroughly clean and examine allthe parts. Replace any damagedor badly worn parts that are found.Examine the Seals or Packing forevidence of damage or too much“permanent set.” If they are not ingood condition, replace them.
In particular, examine the Washpipe fornicks, scratches or abrasions. Small,superficial scratches and abrasionsmay be polished out by use of crocuscloth. If the Washpipe includes anysevere gouges or scratches, it must bereplaced.
To replace the Washpipe, clamp theBottom Sub in a vise horizontally, sup-porting the Washpipe end farthest fromthe Bottom Sub, with a wood timber orother support. Unscrew and remove thedamaged Washpipe. Assemble the newWashpipe into the Bottom Sub, takingcare to support the free end, to avoidbending the Washpipe.
Clean, good quality thread dope shouldbe applied to each connection as it ismade up. All parts should be lubricatedwith good quality grease or heavyweightoil as they are assembled.
AssemblyBefore assembling the Bowen SurfaceBumper Jar, make sure that all of theparts are thoroughly cleaned, lubricatedand in good condition. Replace all dam-aged or badly worn parts.
1. Install the Packing Set into the SealInsert.
2. Install the two O-Ring Seals on theO.D. of the Seal Insert in the groovesprovided. Set the Seal Insert asidefor later use.
NOTE: In the following operations, make
sure that thread dope is thoroughly applied
to all threads before making them up.
3. Clamp the Bottom Sub in a suitablevise.
4. Make the Washpipe up to theBottom Sub. Support the free end ofthe Washpipe, and do not wrenchon the sealing surface of the Wash-pipe.
5. Remove the Bottom Sub-WashpipeSub-Assembly from the vise and layit aside.
6. Clamp the Bowl Extension in thevise.
7. Assemble the Knocker Sub in theBowl Extension. Wrench it up tight.
8. Insert the threaded end of the MainMandrel through the Bowl Extensionand Knocker Sub.
9. Make the Top Sub up to the end ofthe Main Mandrel and tighten it.
10. Lubricate the Packing Set and installit into the recess provided in thelower end of the mandrel, seating itsecurely against the shoulder. It maybe necessary to seat the Insert, byplacing a hardwood block against itand striking the block a sharp blowwith a hammer.
Control Ring
Friction SlipSpacer
Mandrel
7
11. Insert the Friction Mandrel into theMain Mandrel and Wrench it uptight. Wrench only on the wrenchflats provided.
12. Install the Control Ring inside theBowl in the threads provided. Inmaking the setting, the Control Ringis turned back to the lowest point;then, the Slip Setting Gauge is usedto achieve the proper low trippingtonnage setting. (The Slip SettingGauge is a rigid tube of the sameoutside dimensions and appear-ance as that of the Friction Slip,except that it does not have thevertical slots cut in it. In addition, arod is provided which, whenscrewed into the top edge, servesas a handle for inserting the slipsetting gauge into the Bowl of thetool.) The Slip Setting Gauge isplaced in the taper of the Bowl andheld securely as far into the Bowl aspossible. The Control Ring shouldthen be screwed until it movestoward the slip setting gauge andtouches the bottom of the slip set-ting gauge. To screw the ControlRing up until it touches the bottomof the slip setting gauge, the ControlPlug should be removed from theBowl. A screwdriver can be insertedto engage with the adjusting slots inthe Control Ring and easily permitscrewing the Control Ring towardthe Slip Setting Gauge.
13. Insert the Friction Slip inside theBowl.
14. Insert the Friction Slip Spacer insidethe Bowl and up against the FrictionSlip.
15. Install the Washpipe-Bottom Sub
Assembly. This piece was as-sembled in Steps 4 and 5. Greasethe Washpipe to cut down Frictionon Packing. Insert Washpipe care-fully inside the Main Mandrel toavoid damaging the Packing. Makeup Bottom Sub to the Bowl.
16. Place assembled Tool in tester andadjust control ring to desired trip-ping load.
17. Install the Control Ring Plug into theControl Ring port located on theBowl.
Bowen Surface Bumper JarCalculated Strength Data
Maximum Torque 33,800 ft-lbsat YieldMaximum Tensile 845,000 lbsLoad at YieldMaximum Allowable 8,000 psiPump PressureSetting Load * 0 to 50 Tons(Tripping Tonnage)
* 0 to 100 tons with optional 9" O.D. Bowl
The above tensile strengths are calculated
theoretical yield strengths and are considered
accurate to ± 20%.
These figures do not constitute a guar-antee, actual or implied. They are meantto serve as a guide only. Appropriateallowance must be made in use as asafety factor.
Maximum Recommended Tightening Torquefor Threaded Connections
Tool Top Sub Knocker Sub Bowl Extension Bowl Main Mandrel Bottom Sub
Assembly O.D. X I.D. to to to to to to
No. (in) Main Mandrel Bowl Extension Bowl Bottom Sub Friction Mandrel Washpipe
(ft-lbs) (ft-lbs) (ft-lbs) (ft-lbs) (ft-lbs)
74520 7 x 1-7/8 16,900 16,900 17,900 17,900 2,700 2,700
The above makeup torques are the maximum recommended make up torques for each connection.
They are set at 50% of the calculated theoretical yield torque.
8
Bowen Surface Bumper Jar
5-1/2 5-1/2
Connection F.H. F.H.
O.D. 7 7
I.D. 1-7/8 1-7/8
Stroke 48 48
Part No. 74520 **14770
Complete Assembly Weight 1160 1160
Replacement Parts Part No. 13587 13587
Top Sub Weight 265 265
Part No. 74522 13586
Knocker Sub Weight 50 50
Part No. 74523 13585
Bowl Extension Weight 455 455
Part No. 74524 13582
Bowl Weight 220 220
Part No. 74525 13581
Bottom Sub Weight 215 215
Part No. 78609 14771
Main Mandrel Weight 298 298
How to Order:
Specify:
(1) Name and Number of Assembly or Part
(2) Size and Type of Top and Bottom Connection
Sold Export Only
** Old Design with Tapered Part Connections.
† For optional O-ring seal configuration
OB
SO
LETE
(FO
R RE
F. ON
LY)
Replacement Parts (Continued) Part No. 13588 13588
Washpipe Weight 58 58
Part No. 66816 13694
Packing Set Weight 4 4
Part No. 78610 14772
Friction Mandrel Weight 28 28
Part No. 844 844
Control Ring Weight 3 3
Part No. B236 B236
Friction Slip Weight 17 17
Friction Slip Part No. 13594 13594
Spacer Weight 4 4
Control Part No. 4144 4144
Ring Plug Weight 1/4 1/4
Accessories Friction Mandrel Part No. 14773 14773
Socket Wrench Weight 27-1/2 27-1/2
Part No. 242 242
Lifting Sub Weight 50 50
Plug & Control Part No. 86 86
Ring Wrench Weight 1/2 1/2
Extra Jar Service Kit Part No. 13693
Thread Lubricant (KOPR-KOTE) Part No. 153823
Test Sub (Pin) Part No. 13592
Test Sub (Box) Part No. 237-2
Optional Seal Insert † Part No. 13665
Non-Extrusion Ring † Part No. 365-37 (2 req’d.)
Seal Protector Ring † Part No. 375-37 (2 req’d.)
Washpipe Seal † Part No. 568334
Insert Seal † Part No. 568235 (2 req’d.)
Seal Insert Removal Tool † Part No. 59331
Recommended Spares:
(1) 2 Washpipes(2) 1 Seal Insert †(3) 1 Friction Mandrel(4) 1 Control Ring(5) 1 Friction Slip(6) 1 Control Ring Plug(7) 4 Non-Extrusion Rings †(8) 4 Seal Protector Rings †(9) 6 Packing Sets
w w w . n a t o i l . c o m© Copyright 2003 National Oilwell
PDF/1110
MANUAL NO. 4300 R2
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