WFT073448

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HJ Double-Acting Hydraulic Drilling Jar

Drilling Tools

Weatherford’s HJ double-acting hydraulic drilling jar can provide immediate jarring in eitherdirection to free stuck pipe or bits. This capability results in greater jarring exibility andeffectiveness.

The HJ jar can be teamed with Weatherford’s MA drilling impact enhancer to increase theacceleration of the hammer mass for greater impacts.

• High-angle drillstrings

• All conventional oil and gas wells

• Deviated oil and gas wells

• In its normal locked position, the HJ jar delivers immediate upward or downward blows tofree stuck pipe. This two-way exibility enhances jarring performance.

• Fast resetting is achieved by re-engaging the lock to allow continuous up or down jarring.

• The HJ jar comes complete with a mechanical lock mechanism to prevent accidental ringduring normal operations and to eliminate the requirementfor a safety clamp.

• The hydraulic metering system works independently from uid viscosity to ensureconsistent delay times over the full operating temperature range for optimal performance.

Applications

Features, Advantages and Benefts

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Drilling Tools



Specifcations

New a OD (in./ mm ) 3.42086.87

4.828122.63

6-3/8161.93

6-21/32169.07

8-5/32207.17

9-11/16246.06

Nominal OD (in./ mm ) 3-3/885.73

4-3/4120.65

6-1/4158.75

6-1/2165.10

8203.20

9-1/2241.30

Nominal ID (in./ mm ) 1.37534.93 2.25057.15 2.52064.01 2.52064.01 2.75069.85 3.00076.20

Standard connections 2-3/8IF NC26

3-1/2IF NC38

4-1/2IF NC50

4-1/2IF NC50

6-5/8Reg/FH

7-5/8Reg

Tensile yield b (lbf/kN ) 164,214730

439,7961,956

827,8833,683

745,0943,314

899,7624,002

1,658,4277,377

Torsional yield b (lbf-ft/kN•m ) 6,8409.3

12,51817.0

41,63556.4

45,98062.3

77,831105.5

140,415190.4

Maximum pre-jarring pull (lbf/ kN ) 45,000200

100,000445

165,000734

180,000801

295,0001,312

410,0001,824

Tool length (ft/ m) 164.9

206.1

Tool length c/w top sub (ft/ m) 319.4

Weight (lb/ kg )550249

1,000454

1,800816

1,950885

3,0001,361

4,1501,882

Weight c/w top sub (lb/ kg ) 800363

1,500680

2,8501,293

3,0001,361

4,5002,041

6,5002,948

Overall jar stroke (in./ mm ) 21533

18457

Maximum temperature, standard seals (°F/ °C ) 275° 135°

Maximum temperature, high-temperature seals c (°F/ °C )

392° 200°

Pump-open area (in. 2/cm 2 ) 5.434.8

11.171.6

16.8108.4

16.8108.4

28.3182.6

35.8231.0

Circulating pressure (psi/ bar ) 5,000345

Hydrostatic pressure (psi/ bar ) None

a New OD is based on nominal OD plus wear allowance.b Tensile and torsional yield values are calculated per API RP7G, based on nominal dimensions and the published yield strength of the material.These values do not constitute a guarantee, actual or implied.

c The maximum temperature is available upon request only.

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Drilling Tools



Pump-Open Force Chart

9 1/2-in. OD241.30-mm OD

80356

50034

1,00069

1,500103

2,000138

2,500172

3,000207

70311

60267

50222

40178

30133

2089

1044

0

8-in. OD203.20-mm OD

6 1/4- and 6 1/2-in. OD158.75- and 165.10-mm OD

4 3/4-in. OD120.65-mm OD

Pressure Drop Across Bit (psi/ bar )

3 3/8-in. OD85.73-mm OD

Tool Size(in.) 3-3/8 4-3/4 6-1/4 6-1/2 8 9-1/2

(mm) 85.7 120.7 158.8 165.1 203.2 241.3

Up(lbf) 8,000 to 12,000 25,000 to 35,000 60,000 to 80,000 80,000 to 100,000

(kN) 35.6 to 53.4 111.0 to 156.0 267.0 to 356.0 356.0 to 445.0

Down(lbf) 4,000 to 6,000 12,000 to 20,000 25,000 to 35,000 30,000 to 45,000

(kN) 17.8 to 26.7 53.0 to 89.0 111.0 to 156.0 133.0 to 200.0

Pump-open force is created by pressure drop across the bit. The pump pressurecreates a reaction force in the tool that tries to force it open. Reduce the pump toidle before attempting to jar.

Specifcations (continued)

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WFT073448