Hevi-Hitter Mechanical Drilling Jar User's Guide

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Baker Hughes INTEQ Hevi-Hitter Mechanical Drilling Jar User’s Guide 750-500-065 Rev. A February 1997 Baker Hughes INTEQ Technical Publications Group P.O. Box 670968 Houston, TX 77267-0968 USA 713-625-4415

Transcript of Hevi-Hitter Mechanical Drilling Jar User's Guide

Baker Hughes INTEQ

Hevi-Hitter

Mechanical Drillin g Jar

User’s Guide

750-500-065 Rev. A February 1997

Baker Hughes INTEQTechnical Publications GroupP.O. Box 670968Houston, TX 77267-0968USA713-625-4415

sed ; ther ed

This manual is provided without any warranty of any kind, either expresor implied. The information in this document is believed to be accuratehowever, Baker Hughes INTEQ will not be liable for any damages, whedirect or indirect, which results from the use of any information containherein.

Table of Contents

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Table of Contents

Chapter 1

Hevi-Hitter Mechanical Drilling Jar

Making-Up, Breaking-Out Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Activating The Jar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjusting Impact Force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figuring Tripping Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How To Use The Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

User’s Guide i750-500-065 Rev. A / February 1997 Confidential

Table of Contents Publication Style Guide

ii Baker Hughes INTEQConfidential 750-500-065 Rev. A / February 1997

User’s Guide750-500-065 Rev. A / February 4, 1997 Confidential

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Hevi-Hitter Mechanical Drillin g JarThe Baker Hughes INTEQ’s Hevi-Hitter Mechanical Drilling Jar is run ithe drill string to free stuck pipe. This purely-mechanical tool can impalarge amount of force (exceeding 700,000 lbs on larger sizes) to jar thestring up or down. The Hevi-Hitter jar recocks automatically and will continue to operate as long as necessary. The Hevi-Hitter jar is built o4340 aircraft quality, ultrasonically inspected steel.

The Hevi-Hitter mechanical drilling jar can jar in both directions at presimpact values. This permits selective operation to free a stuck drill strinwithout adjusting the tool at the surface. The rugged simplicity of the jamakes it easy to operate and maintain. It can be left on the rig site andseveral times during the drilling of a well without being overhauled.

Making-Up, Breaking-Out Tool

Always use back-up tongs on the Hevi-Hitter jar’s top (box) connectionabove the drive shaft when either making-up or breaking-out drill collarheavy-weight drill pipe. Always ensure that the rotary table is unlockedduring make-up or break-out. When the Hevi-Hitter jar is in the slips, nemake it up into the string by reversing the rotary table.

When making-up the drilling assembly, drill collar, or heavy-weight drilpipe of the same size as the jar or smaller should be run immediately a

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the jar. This will dissipate the hitting force before it enters the drill strinand balance the bending that may occur in the drilling assembly.

Do not run a stabilizer next to the jar. The jar’s flexing motion during rotary drilling could fatigue the stabilizer. It also will alter the drilling assembly’s characteristics and can affect the drilling performance.

The Hevi-Hitter jar should be in the disengaged position when run in thhole. To disengage the jar, set the slips on the jar housing below the dshaft. Unlock the rotary table and place the break-out tongs on the jar athe drive shaft and the back-up tongs on the jar housing below the drivshaft. Pull on the break-out tongs. Turn the drive shaft one eighth turnthe left and pick up on the string. This will expose about sixteen inchesthe drive shaft and the jar will be disengaged. Prior to running a used jback in the hole, be sure to cycle the drive shaft up and down to checktravel.

When tripping the jar and before removing the jar from the slips, work driveshaft in and out while rinsing the drive shaft and four ports in the sof the jar with water. This will clean the mud from around the packing fease of disassembly and will ensure proper operation if the jar is to bereused at a later time.

If the jar has been downhole for over three days without being fired, thdrive shaft of the jar should be worked up and down. This will ensure proper operation, minimizing the chance of the packing freezing to thedrive and extension shaft.

If the jar leaks oil, the jar should not be used. Oil leakage can allow muenter the jar and damage the cocking and firing mechanism. Oil insidejar is used strictly for lubrication and to prevent the housing from collapsing when drilling in high formation pressure.

When coming out of the hole, only break the jar from the string. Do nobreak the joints on the tool. Be sure to place the tongs properly on thejoint connections of the joint to be broken. Do not space tongs across multiple connections as it could damage the jar.

Activating The Jar

To jar downwards, let off on the drill string until the weight indicator reading reaches the tripping weight (see “Figuring Tripping Weight”), athe jar will then fire. Then slowly raise the drill string until the weight indicator reading is higher than the weight above the jar to reengage fodownward firing.

To jar upwards, raise the drill string until the weight indicator reading reaches the tripping weight (see “Figuring Tripping Weights”), and the

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will then fire. To reengage the Hevi-Hitter jar, slowly let off on the drill string until the weight indicator reading drops below the weight of the string above the jar.

Adjusting Impact Force

Applying torque to the drill string in a clockwise direction will increase thimpact force. Applying torque to the drill string counter-clockwise will decrease impact force. Torquing should be done in 30-45° incrementsdrill string rotation at surface.

Increasing the downward tripping action is recommended only in emergencies. Increased downward jarring will cause the drill string to fThis will cause the drillstring to fatigue and possibly break if the jar is uscontinuously in the downward mode with additional torque applied.

Right-hand torque will increase as the jar is run deeper in rotary drillingThus, the jarring force will increase. Right-hand torque may become sgreat that the rig may not have enough power to fire the jar properly, making it necessary to relieve some of the torque.

To relieve torque from the jar and drill string, work the drill string up andown after each 30° to 45° turn of the rotary table counterclockwise. Twill relieve the right-hand torque in the drill string and on the jar. Durinthis operation, attempt to make the tool function in the downward modethe jar fires, enough torque has been relieved from the string.

User’s Guide 1-3750-500-065 Rev. A / February 1997 Confidential

Hevi-Hitter Mechanical Drilling Jar Hevi-Hitter

Specifications

Tool Dimensions and Make-up Information

Tool OD 4.75” 6.25” 7.75”

ID 1.87”/2.00” 2.25” 2.75”

Weight 1,350 lb. 2,450 lb. 4,200 lb.

Length (Shoulder-to-shoulder)

Up 31.78’ 35.20’ 36.90’

Neutral 31.11’ 34.58’ 36.27’

Down 30.46’ 33.94’ 35.82’

Tensile Strength 529,000 933,750 1,541,600

Max Collar OD Below Jar

5.50” 6.75” 9.00”

Max Collar OD Above Jar

4.75” 6.25” 7.75”

Min Collar Weight Above Jar

5,500 lb. 8.650 lb. 11,450 lb.

Max Make-Up Torque

10,000 ft-lb 19,700 ft-lb. 55,000 ft-lb.

Max Drilling Torque

3-1/2 IF 4 IF4-1/2IF

6-5/8 IF

Recommended Running Time

Run in tension 350-450 rotating hours

Run in compression 100-200 rotating hours, depending on formation conditions

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Hevi-Hitter Jar Impact Forces (lbs. x 1,000).**Heavy-Weight Drill Pipe or Drill Collar Weight Above Jars (lbs. x 1,000)

4 6 8 10 12 14 16 18 20

3 45 68 90 113 135 157 180 202 225

4 60 90 120 150 180 210 240 270 300

5 75 113 150 187 225 262 300 337 374

6 90 135 180 225 270 315 359 404 449

7 105 158 210 262 315 367 419 472 524

8 120 180 240 300 359 419 479 539 599

9 135 202 270 337 404 472 539 606 674

10 150 225 300 374 449 524 599 674 748

11 165 247 330 412 494 576 659 741 823

12 180 270 359 449 539 629 719 808 898

13 195 229 389 487 584 681 778 876 973

14 210 315 419 524 629 733 838 943 1,048

15 205 337 449 562 674 786 898 1,010 1,122

16 240 356 479 599 719 838 958 1,078 1,197

** Impact forces estimated; actual force depends on hole conditions, depth, hole angand other conditions.

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Figuring Tripping Weights

* The amount of drag depends on hole conditions.

Fire Jar Upwards

String Weight

Plus Up-fire Setting

Plus Up-drag*

Minus Weight Below Jar

Equals Indicator Reading To Fire Jar

Fire Jar Downwards

String Weight

Minus Down-fire Setting

Minus Down-fire Drag*

Minus Weight Below Jar

Equals Indicator Reading To Fire Jar

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How To Use The Chart

To determine the air weight of drill collars needed to provide the desiremaximum weight on bit:

1. Select weight on bit (1)

2. Draw a line to the maximum hole inclination (2)

3. Intersect the appropriate mud weight line (3)

4. Find the required air weight

Choose a combination of collars and heavywall drill pipe to achieve theweight.

Example: Assume six joints of 6-1/4” x 2-1/4” drill collar and six jointof 4-3/4” x 2-1/4” drill collar with the rest of the weight to bemade-up with 4” heavywall drill pipe.

5. Find six joints of 6-1/4” x 2-1/4” collar (A)

6. Draw a line from (A) to the 4-3/4” x 2-1/4” collar line (B)

7. Count six divisions (joints) from (B) to the right (C)

8. Draw a line from (C) to the 4” heavywall line (D)

9. On the 4” heavywall line, count the number of joints between (and the intersection of the 45,000 lbs line (from step 4). The number of joints should be 23.

10. BHA equals six joints of 6-1/4” collar, six joints of 4-3/4” collaand 23 joints of 4” heavywall pipe.

Place the jar above the required air weight to assure the tool runs in tenAlways run joints of the collar or heavywall pipe immediately above theto protect drill pipe from damage during jarring operations.

Recommendations On Running Drilling Jars

Whenever possible, run the jar in tension. If a shock sub is in the drill string, run approximately 6,000 lbs of tension on the jar. If a shock subnot in the drill string, run approximately 10,000 lbs of tension on the ja

Never run the jar in compression unless absolutely necessary. Runnincompression places the tool under unnecessary stress and will shortelife.

Never run the jar in a transition zone. Alternating tension and compreswill damage the tool.

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When making-up the drilling assembly, run a drill collar or heavy-weighdrill pipe immediately above the jar. this dissipates the hitting force befit enters the drill pipe and balances bending that may occur in the drilliassembly.

Drill string components above the jar should have equal or smaller diameter than the drilling jar to reduce chances of sticking above the ja(Obviously, if you get stuck above the jar, there is no way to fire the ja

Do not run a stabilizer next to the jar. The jar’s flexing motion during rotary drilling could fatigue the stabilizer. It will also alter the drilling assembly’s characteristics and might have an impact on drilling performance.

User’s Guide 1-9750-500-065 Rev. A / February 1997 Confidential

Hevi-Hitter Mechanical Drilling Jar Hevi-Hitter

•Notes•

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