Hydra-Jar AP Double-Acting Hydraulic Drilling Jar The Hydra-Jar AP* double-acting hydraulic drilling jar is used to amplify the force force applie applied d at surface surface in order to free free stuck stuck drillst drillstem em compone components nts during drilling and fishing operations. The direction of jarring can be both up and down. The jar uses a unique temperature-compensation process to provide consistent impact, blow after blow, and high-temperature seals that make it suitable for hostile drilling conditions. In most applications the tool should be run in conjunction with the Accelerator AP tool to increase the impact, while protecting the drillstring and surface equipment from shock. The jars are serviced and inspected at our service centers to ensure proper downhole operation. Call your local service facility for technical service if required.
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Jarring Up ■
Establish the ‘jar load up (overpull)’ to be applied, subject to the maximum detent working load shown in the table of specifications. Jar load up = Final weight indicator reading up, before impact – working string weight above the jar.
Table of Specifications OD, in ID, in Tool joint connection, in
Overall length extended, ft
33 ⁄ 8 41 ⁄ 4
11 ⁄ 2 2
23 ⁄ 8 AP API IF 7 2 ⁄ 8 API IF
24.42 29.83
43 ⁄ 4 51 ⁄ 8 61 ⁄ 4
21 ⁄ 4 21 ⁄ 4 23 ⁄ 4
31 ⁄ 2 AP API IF WT-38 41 ⁄ 2 XH
29.83 29.83 31.17
61 ⁄ 4 Mo Mod 1 6 ⁄ 2
23 ⁄ 4 23 ⁄ 4
41 ⁄ 2 XH 41 ⁄ 2 API IF
31.17 31.17
7 71 ⁄ 4
23 ⁄ 4 23 ⁄ 4
5 H-90 51 ⁄ 2 H-90
31.50 31.50
73 ⁄ 4 8 81 ⁄ 4
3 3 3
5 8 AP 6 ⁄ API REG 5 6 ⁄ 8 AP API REG 5 8 AP 6 ⁄ API REG
32.00 32.00 32.00
81 ⁄ 2 91 ⁄ 2
3 3
5 8 AP 6 ⁄ API REG 5 7 ⁄ 8 AP API REG
32.00 32.50
Select the ‘jar load down (slack-off)’, subject to ■
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Operating Instructions
Working string weight above the jar = Drag + String weight from drilling jar to surface. Drag = Weight indicator reading up – Weight indicator reading down.
To repeat the operation, slack off until the indicator reads 10,000 to 15,000 lbf lower than the ‘working load down’ and immediately apply the previous previous ‘jar load load up’ again. again.
Jarring Down
Do not place rig tongs on service connections or on the chromed area of the mandrel. Do not remove vent or fill plugs; mud or grease running out of vent ports is not detrimental to the operation of the tool. Tong up the lift sub and hoist the tool in the elevator. Remove the safety clamp just prior to lowering the tool into the hole.
Apply pull to the drillstring as per the established final weight indica tor reading reading and and wait wait for the the impact. impact. The The weight weight indicat indicator or will will display display a small loss just before impact, corresponding to the retraction of the drillstr drillstring. ing. There There should should be be a clear clear change in the the reading reading after after impact.
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the maximum maximum detent detent working working load load shown shown in the the table table of specifi specificaca tions, tions, and the weight weight of of the drill drill collars collars or Hevi-Wat Hevi-Wate* e* drillpipe drillpipe (HWDP) (HWDP) just just above the Hydra-Jar AP tool, whichever is less. Jar load down = Working string weight above the jar - Final weight indicator reading down, before impact.
Slack off as per the established final weight indicator reading, and wait for impact. To repeat the operation, pull up until the weight indicator reads 10,000 to 15,000 lbf higher than it did before impact, and immediately slack off to the previously selected ‘jar load down’ again.
Down-jar impacts may not be transmitted through shock tools run in the lower drilling assembly. When jarring down with a small number of dr ill collars or HWDP on top of the jar, select a load that will not buckle the drillpipe run above the jar. Adequate weight just above the jar provides optimum impact for down-jarring. The mud pump should be shut down or slowed before down-jarring operations begin.
Maximum Tensile yield detent working strength, lbf load, lbf 44,000 236,062 70,000 377,871 95,000 492,284 95,000 492,284 150,000 730,324 150,000 964,207 175,000 964,207 230,000 1,179,933 240,000 1,261,162 260,000 1,315,225 300,000 1,621,565 350,000 1,819,384 350,000 1,846,269 500,000 1,654,172
Torsional yield Up stroke, strength, lbf.ft in
Down stroke, in
Total stroke, in
6,842 15,381
7 8
7 7
21 25
19,126 30,000 40,505
8 8 8
7 16 613 ⁄ 16 7
25 25 25
50,757 54,796
8 8
7 7
25 25
67,396 84,155
8 8
8 8
25 25
86,848 98,490 115,418
8 8 8
7 7 8
25 25 25
115,418 152,802
8 8
8 8
25 25
Tool weight, lbm 500 800 1,050 1,155 1,600 1,600 1,850 2,600 3,000 3,200 3,550 4,000 4,500 5,600
Hydra-Jar AP Double-Acting Hydraulic Drilling Jar Hydra-Jar AP Drilling Jar Recommended Changeout Intervals (Use vs Jar Size) Tool OD, in 3.375 4.25 4.75, USE Hole Hours Hole Hours Hole Hours size, in size, in size, in Rotating in straight 4.75 150 5.875 150 6.125 200 or build/ drop section 5.875 150 6.125 150 6.75 150
Rotating in deviated or horizontal section
5.125 Ho l e size, in
Hours
6.25 Hole size, in
Hours
6.5 Hole size, in
Hours
6.75
150
8.375
300
8.75
300
7.875
150
8.75
200
9.875
200
6.75
150
7.875
150
8.75
100
9.875
200
10.625
150
4.75
250
5.875
250
6.125
300
6.75
300
8.375
400
8.75
400
5.875
200
6.125
200
6.75
250
7.875
250
8.75
300
9.875
300
6.125
150
6.75
200
7.875
200
8.75
200
9.875
250
10.625
250
6.75
150
7.875
150
8.75
150
9.875
150
10.625
200
12.25
200
7.875
100
8.75
100
9.875
100
10.625
100
Hours
Fishing
100 hours
Milling
50 hours
Hydra-Jar AP Drilling Jar Recommended Changeout Intervals (Use vs Jar Size), Continued Tool OD, in 7, 7.25 7.75 8 USE Hole size, Hours Hole size, Hours Hole size, Hours in in in Rotating in straight or 9.5 300 9.875 200 9.875 300 build/ drop section 9.875 200 10.625 150 10.625 250 12.25
Rotating in deviated or horizontal section
150
12.25
150
12.25
200
17.5
150
8.25, 8.5 Hole size, in
Hours
9.5 Hole size, in
10.625
250
12.25
250
12.25
200
17.5
150
17.5
150
26
100
9.5
350
9.875
300
9.875
400
10.625
400
12.25
400
9.875
300
10.625
250
10.625
350
12.25
350
17.5
350
12.25
200
12.25
200
12.25
300
17.5
250
26
200
14.75
150
17.5
150
17.5
250
22
200
30
150
22
200
26
150
Fishing
100 hours
Milling
50 hours
Hydra-Jar AP Drilling Jar Recommended Changeout Intervals (Temperature vs Jar Size) Tool OD, in 3.375 4.25 4.75, 5.125 6.25 Bottomhole temperature, Hours Hours Hours Hours degF 100 to 200 200 200 300 400
6.5, 7, 7.25 Hours
7.75 Hours
8, 8.25, 8.5 Hours
9.5 Hours
400
300
400
400
200 to 300
200
200
200
300
300
300
300
300
300 to 400
150
150
200
300
300
300
300
300
400 to 500
150
150
150
150
150
150
150
150
Hydra-Jar AP Double-Acting Hydraulic Drilling Jar Changing the Impact Load Impact can be changed by adjusting the working load on the Hydra-Jar AP tool.
Changeout Recommendations The Hydra-Jar AP tool should be changed out periodically for servicing. In the tables shown, the changeout recommendations refer to the total number of hours in the hole (drilling, circulating, and jarring) between services. Use the tables to determine the applicable changeout hours based on jar size, use, hole size, and bottomhole temperature; the lower of the two values is the correct one.
Placement Recommendations ■
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Always place a minimum of 10% to 20% of the expected drilling jar load as hammer weight above the jar. Maintain 20% of weight on bit (WOB) between the drilling jar and neutral point to ensure that the jar is outside the neutral point transi tion zone. zone. Always be aware that the placement of the drilling jar needs to be reconsidered when there is a change in the BHA or in WOB. Do not place stabilizers or other BHA components with an OD larger than that that of the jar, jar, above above the drilling drilling jar. jar. Always keep any stabilizer at least 90 ft away from the drilling jar. Never use the jar as a crossover between drill collars and HWDP or two differe different nt sizes sizes of collars collars.. High bending bending stresses stresses occur occur in these locations and increase the risk of tool damage. Jar placement is critical. Always contact your Schlumberger representative to determine the proper placement.
KEY TERMS Detent: The mechanism by which the hydraulic fluid in the jar is slowly metered through the detent ring orifice when a load is applied, thus providing a delay before the jar fires.
Full Detent: Jar in fully open (or closed) position prior to applying jar load. Short Detent: Jar in partially open (or closed) position prior to applying jar load. Delay Time: Time elapsed between cocking and firing the jar. Test Load: Load used to perform functional test at service facility.
Placement Recommendations Hydra-Jar AP in tension Neutral point below the jar. Drilling jar remains “open” and cocked for down jarring while drilling. No risk of premature firing of drilling jar when picking up off bottom. Pump-open force will help extend the drilling jar open while drilling, and does not affect the WOB. Generally used in low angle wellbores when there is sufficient BHA weight.
Hydra-Jar AP in compression Neutral point above the jar. Drilling jar remains “closed” and cocked for up jarring while drilling. Drilling jar may fire prematurely if drillstring picked up off bottom too quickly. Drilling jar must be picked up off bottom and allowed to bleed through detent before tripping out or setting the slips, to prevent accidental firing Unavoidable in highly deviated wellbores when there is insufficient BHA weight.
Jar can be placed in tension or compression; see table to the right for differences. We recommend running in tension when possible.
www.slb.com/HydraJarAP
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