This type of jar allows operator to apply variable impact in both the up and down directions. The HJ is intended for use in highly deviated or high friction wells where conditions may prevent applying sufficient force to release a mechanical latch.
The HJ is a purely hydraulic bidirectional drilling jar that allows the operator to apply variable impact in both the up and down directions – unaffected by torque.
| SDT-HJ475 | SDT-HJ650 | SDT-HJ800 | SDT-HJ950 | |
| Nominal OD (A), in | 4.88 | 6.61 | 8.15 | 9.48 |
| Thru Bore (B), in | 2.2 | 2.76 | 2.76 | 3 |
| Length in open position, ft | 18 | 18.4 | 22.3 | 22.3 |
| Length in closed position (C), ft | 16 | 16.4 | 20.3 | 20.3 |
| Free stroke after hydraulic delay during extension, in | 7.28 | 7.48 | 7.87 | 7.87 |
| Free stroke after hydraulic delay during compression, in | 7.28 | 7.48 | 7.87 | 7.87 |
| Hydraulic delay time*, sec | 30 – 150 | 30 – 150 | 30 – 150 | 30 – 150 |
| Pump Open Area, in.sq. | 11,78 | 23.7 | 30.7 | 41.2 |
| Maximum tensile (compressive) load during hydraulic delay, lbs | 77 150 | 176 370 | 242 500 | 242 500 |
| Maximum tensile load during pulling out of hole, lbs | 286 600 | 617 290 | 804 700 | 1 197 100 |
| Maximum torque, ft-lbs | 13 000 | 22 120 | 60 700 | 122 960 |
| Connecting threads | NC38 | NC50 | 6 5/8 Reg | 7 5/8 Reg |
| Make up torque, ft-lbs | 8 680– 10 120 | 18 400 – 19 900 | 47 000 – 50 600 | 57 850 – 65 100 |
| Maximum operating temperature***, °F | 248 | 248 | 248 | 248 |
| Weight, lb | 705.5 | 1 313 | 2 425 | 3 307 |
| Overhaul period, hours below the rotary table**, hours | 500 | 750 | 750 | 750 |
* Actual values are supplied in tool test report
** Tool should be sent for maintenance every 250 hours when used in environment with chloride content higher than 50,000 mg/l
*** As per special request tool can be equipped with seals of up to 175 deg °C (350 deg °F)
| SDT-HJ475 | SDT-HJ650 | SDT-HJ800 | SDT-HJ950 | |
| Nominal OD (A), mm | 124 | 168 | 207 | 241 |
| Thru Bore (B), mm | 56 | 70 | 70 | 76 |
| Length in open position, mm | 5 500 | 5 600 | 6 800 | 6 800 |
| Length in closed position (C), mm | 4 900 | 5 000 | 6 190 | 6 200 |
| Free stroke after hydraulic delay during extension, mm | 185 | 190 | 190 | 200 |
| Free stroke after hydraulic delay during compression, mm | 185 | 190 | 190 | 200 |
| Hydraulic delay time*, sec | 30 – 150 | 30 – 150 | 30 – 150 | 30 – 150 |
| Pump Open Area, sm.sq. | 76 | 153 | 198 | 266 |
| Maximum tensile (compressive) load during hydraulic delay, kgf | 35 000 | 80 000 | 110 000 | 110 000 |
| Maximum tensile load during pulling out of hole, kgf | 130 000 | 280 000 | 365 000 | 543 000 |
| Maximum torque, kgf*m | 1 800 | 3 000 | 8 390 | 17 000 |
| Connecting threads | NC38 | NC50 | 6 5/8 Reg | 7 5/8 Reg |
| Make up torque, kgf*m | 1 200 – 1 400 | 2 500 – 2 700 | 6 500 – 7 000 | 8 000– 9 000 |
| Maximum operating temperature***, °C | 120 | 120 | 120 | 120 |
| Weight, kg | 320 | 596 | 1 100 | 1 500 |
| Overhaul period, hours below the rotary table**, hours | 500 | 750 | 750 | 750 |
* Actual values are supplied in tool test report
** Tool should be sent for maintenance every 250 hours when used in environment with chloride content higher than 50,000 mg/l
*** As per special request tool can be equipped with seals of up to 175 deg °C (350 deg °F)
