DaileyHydraulicDrillingJar

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Spline Mandrel

Up Anvil

Hammer

Down AnvilFlow MandrelUpper Pressure Position

Lower Pressure Piston

Triggering Valves

Wash MandrelBalance Piston

Piston Stop

Bottom Connector

Balance Housing

Pressure Housing

Connector Housing

Spline Housing

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Utilizing a patentedhydraulic time delay /mechanical tripping system,the Hydraulic Drilling Jar(HDJ) combines downholereliability and long operatinglife under a wide range ofdrilling conditions andhostile environments.Combining the best of bothmechanical and hydraulictechnologies, the HydraulicDrilling Jar design features aone piece involute splinemandrel for maximumtorque capacity withminimum backlash, and afluid-isolated high pressurechamber that lubricates andisolates the Jar’s movingseals, impact shoulders andmandrel, from thedestructive effects ofdownhole formationcuttings, sand or otherdebris.

The Hydraulic DrillingJar design is virtuallyunaffected by downholetemperatures and generateslittle heat itself when jarring,yet it delivers virtually thesame time delay in deep, hotholes as it does on thesurface. The design alsoeliminates the need forbleed-off compensation.Therefore the trip load willbe the same as the brakeload. Hydraulic Jarsare delivered ready to go.The jarring load is controlledand varied at the surface bycontrolling the overpull. Tohit harder, pull harder. To hitlighter, pull lighter.

Dailey

Proper Operations

MANDREL CLAMPThe HDJ will arrive on location with a hinged Mandrel Clamp (Dog Collar) installed.

Leave the Mandrel Clamp installed until the HDJ is ready to go through the rotary. Toremove the mandrel clamp, put the jar in tension. Remove the shipping strap and pull thelock pin up until the U shaped latch can be opened. Spread the two body halves andremove the clamp from the jar. Before installing the clamp on the jar, visually inspect allparts for cracks or breakage.

Install the clamp on the jar in tension and with the lock pin end up. The latch springshould return the latch to the closed position. Push the lock pin down until the pin headengages the lug. The bottom of the pin can be seen protruding through the lower lug andthe latch will be closed when the lock pin is fully seated. Install the shipping straparound the clamp.

DO NOT USE THE CLAMP IF IT IS DAMAGED OR CANNOT BEOPERATED AS DESCRIBED. FAILURE TO OPERATE AS DESCRIBEDMAY RESULT IN SERIOUS INJURY.

Dailey Hydraulic Drilling Jar Specifications

If the clamp cannot be used, stand the jar and the other components of the stand backin the normal fashion. However, do not release the elevator until the jar closes. To closethe jar, slack off and the jar will go to the cocked position with about 9 inches ofpolished mandrel exposed. Slack off about 9 inches more and wait until the jar falls tothe closed position. This will require about 5 minutes with drill collars above the jar andlonger if the jar is at the top of the stand. When the jar is closed, there is about 1 to 2inches of polished mandrel exposed. When the stand with the jar is picked up, the jarwill go to the cocked position. Suspend the stand about 12 inches above the floor andwait for the jar to fall open. This will require about 5 minutes with drill collars below thejar and longer if the jar is at the bottom of the stand.

The HDJ can be run in tension or compression. It is mandatory that a minimum 15%safety factor in string weight be run between the HDJ and the weight transition zone.Never run the HDJ as a crossover between the drill collars and the heavy wall pipe, orbetween the collars of different O.D.s, because these transition points are whereexcessive stress occurs. Run the same size collar or heavy wall drill pipe directly aboveand directly below the jar. Avoid running the HDJ below reamers, stabilizers, key-seatwipers, or any other tool with a larger O.D. than the HDJ since this might restrict thejarring function.

OPENING THE HDJ ABOVE THE ROTARY

JAR PLACEMENT IN THE STRING

If the HDJ should become cocked on thesurface, it can easily be triggered open with a slight overpull. Support the weight belowthe HDJ in the slips and pick up 5,000 lbs. to 10,000 lbs. with the elevators. At thisextremely low load it will require about 5 minutes for the HDJ to trigger.

(9 inches of polished mandrel exposed)

(With the HDJfully extended there will be about 17 inches of polished mandrel exposed.)

DRILLING WITH THE HYDRAULIC DRILLING JAR INCOMPRESSION

RUNNING IN

The HDJ will normally be in tension when the bit reaches the bottom and should betriggered down with a light load in order to avoid any chance of damage to the bit. Therecommended procedure is to begin rotating, slack off enough weight to that the jar isonly slightly in compression (5,000 lbs. To 15,000 lbs.), And after the jar falls through,slack off to the final drilling weight. Since the jar will cock whenever the string ispicked up off the bottom, this procedure should be followed each time a connectionis made.

The HDJ should always be kept in compression. Use care to start and stop slowlywhen running in to avoid a “yo-yo” effect which could cause the HDJ to cock. Runthrough tight spots and dog legs slowly. Be aware that anything that restricts the I.D. ofthe pipe or collars below the HDJ (float valves, survey tools, etc.) could cause the collarsto “float” if the pipe is lowered too rapidly and could result in cocking the HDJ. If it issuspected that the HDJ has inadvertently cocked, suspend the drill pipe in the elevatorlong enough for the HDJ to trip open (due to the weight of the collars suspended belowit) before running in the hole.

NEVER RUN THE HYDRAULIC DRILLING JAR IN CLOSE PROXIMITY TOANOTHER HYDRAULIC DRILLING JAR, OR ANY OTHER TYPE OF JAR.

Proper Operations

Proper Operations

JARRING

FINDING THE NEUTRAL (OR COCKED) POSITION

RECOMMENDED PROCEDURE TO CHECK THE HDJ

RACKING BACK

No presetting or adjustment is required before running or prior to jarring. The HDJ istotally controlled from the surface using only axial motion. From the neutral position,pull up to the desired load and wait a few seconds for the HDJ to jar up, or slack off tothe desired load and wait a few seconds for the HDJ to jar down. After impact, return theHDJ to neutral and it is immediately ready to jar in the same or in the opposite direction.To hit harder pull harder, to hit lighter pull lighter. There is no other operator actionrequired and the HDJ can be hit in any sequence desired (up only, down only, or up anddown).

The waiting time between setting the brake and the jarring action will be in the rangeof 10-60 seconds and will not be affected by changes in down-hole temperature orhydrostatic pressure or the number of times the HDJ is actuated. It is never necessary to“warm-up” the HDJ or to ciculate to “cool it off”.

Full torque in either direction can be transmitted at all times withoutaffecting either the magnitude or the time delay of the jarring action.

It is not necessary to slack off (or pull up if jarring down) an exact amount of weightor to control the travel of the jar to recock. The proper travel will occur automatically ifsufficient weight is slacked off (or pulled up) to allow the necessary travel at the tool.

When recocking to jar again in the same direction the time delay of the nextblow be affected by overtravel in the direction of neutral.

Each trip out of the hole, wash the mud from the polished mandrel and from insidethe bottom connection. Check the polished mandrel carefully for any signs of corrosion,pitting, or flaking of the plating.

When the jar comes through the rotary,As a safety precaution, do not stand

the jar in the rack with drill collars above it. If racked back as part of a stand, the jarshold be the top joint. This will reduce the load on the mandrel clamp to a minimum.

DRILLING DOES NOT AFFECTTHE HDJ.

NOTE:WILL NOT

REPLACE THE MANDREL CLAMP while the jaris still in tension.

INSTALL THE MANDREL CLAMPWHILE THE TOOL IS STILL IN TENSION.

Contact your Weatherford representative if you have any questions or if assistanceis required concerning the proper operation of the Dailey® Hydraulic Drilling Jar.

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MIDDLE EAST & NORTH AFRICA REGION OFFICE:Weatherford Oil Tool Middle East LimitedP.O. Box 4627Dubai, U.A.E.

Web: weatherford.comE-mail: wotme@weatherford.com

Weatherford products and services are subject to WeatherfordÕs standard terms and conditions.For more information concerning the full line of WeatherfordÕs products and services, pleasecontact your authorize Weatherford representative.

Unless noted otherwise, trademarks and service marks noted herein are property of Weatherford.

© 2003. Weatherford. All rights reserved.