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Hydraulic mechanical drilling jar

General Description
General Description Features & Benefits Specifications Related Resources
Can be used for both drilling and fishing operations
Ability to create shock loads/forces in two directions (up-down)
Stability of hydraulic delay time over the entire operating temperature range
Increased ID of the inner hole for the passage of probes of MWD systems
Cost effective and highly robust design
Simply to service and maintain
In-house visco jets designed and developed for maximum efficiency and cost control
The HMJ is normally operated in the latched position to reduce unexpected jarring while drilling and eliminate movement between jar components, increasing service life.
The spline drive and latch mechanism are enclosed in a single, sealed oil chamber without ports to the annulus. Such ports on other jars may fill with cuttings and restrict the down jar stroke.
With the latch mechanism in the latched position, the inner mandrel and outer housing act integrally, virtually eliminating seal and inner tool wear during normal drilling conditions. There is no need to extend or open the jar before running in the hole.
The HMJ can be run in tension or in compression within the preset latch setting.
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General Description
Hydraulic mechanical Jar (HMJ) is a double acting jar, designed to deliver hydraulic delay when jarring in the up direction, and mechanical release when jarring in the down direction.

The HMJ incorporates a latch mechanism to keep the jar locked in the neutral position and eliminate unexpected jarring while tripping or racking on the derrick.

The built-in mechanical latch keeps the jar locked in a neutral position, which prevents stroking of the jar downhole and unintentional firing of the jar while drilling or tripping. When latched, the mandrel and housing act integrally, eliminating seal and inner-tool wear. The latch eliminates the need for a safety collar and special handling/precautions on the rig floor.

The hydraulic valve provides delay when jarring up, allowing drillers to vary overpull and control impact force. The valve resides in its own oil seal chamber for increased reliability, and a robust metering device controls delay times across operating temperatures.

Down strokes use the mechanical part of the jar, while upward strokes use the hydraulic part with hydraulic delay. The mechanical latch actuation force can be adjusted and set during the jar assembly upon customer request.

Features & Benefits
Can be used for both drilling and fishing operations
Ability to create shock loads/forces in two directions (up-down)
Stability of hydraulic delay time over the entire operating temperature range
Increased ID of the inner hole for the passage of probes of MWD systems
Cost effective and highly robust design
Simply to service and maintain
In-house visco jets designed and developed for maximum efficiency and cost control
The HMJ is normally operated in the latched position to reduce unexpected jarring while drilling and eliminate movement between jar components, increasing service life.
The spline drive and latch mechanism are enclosed in a single, sealed oil chamber without ports to the annulus. Such ports on other jars may fill with cuttings and restrict the down jar stroke.
With the latch mechanism in the latched position, the inner mandrel and outer housing act integrally, virtually eliminating seal and inner tool wear during normal drilling conditions. There is no need to extend or open the jar before running in the hole.
The HMJ can be run in tension or in compression within the preset latch setting.
Specifications
Imperial data figures SDT-HMJ475 SDT-HMJ650 SDT-HMJ675 SDT-HMJ800 SDT-HMJ950
Casing Size (in) 4 3/4 6 1/2 6 3/4 8 9 1/2
Nominal OD (in) 4,88 6,61 6,89 2,15 9,49
Thru Bore (in) 2,17 2,76 2,76 2,76 2,99
Length (ft) 20,34 22,14 22,14 23.46 24,61
Connecting threads NC38 NC50 NC50 6 5/8 Reg 7 5/8 Reg
Jar working area (in.sq.) 11,78 23,7 23,7 30,7 41,2
Hydraulic delay time (sec.) 30 – 150 30 – 150 30 – 150 30 – 150 30 – 150
Torsional Limit (ft lbs) 13 276 29 500 36 140 61 900 139 400
Tensile Yield (lbs) 275 500 617 290 705 500 804 680 1 627 010
Nominal Up Latch Setting (lbs) 35 900 – 55 100 70 500 – 130 000 70 500 – 130 000 99 200 – 154 300 99 200 – 154 300
Nominal Down Latch Setting (lbs) 12 500 – 41 200 26 450 – 97 400 26 450 – 97 400 31 500 – 119 900 31 500 – 119 900
Max Pull During Delay (lbs) 76 280 176 370 189 600 242 500 308 650
Free stroke up (in) 9,05 9,05 9,05 09,05 9,05
Free stroke down (in) 5,9 5,9 5,9 05,9 5,9
Weight (lb) 749 1609 1926 2866 4079
Metric Data+A107:B122 Figures SDT-HMJ475 SDT-HMJ650 SDT-HMJ675 SDT-HMJ800 SDT-HMJ950
Casing Size (mm) 120 165 172 203 240
Nominal OD (mm) 124 168 175 207 241
Thru Bore (mm) 55 70 70 70 76
Length (m) 6,23 6,75 6.75 7,15 7,5
Connecting threads NC38 NC50 NC50 6 5/8 Reg 7 5/8 Reg
Jar working area (sm.sq.) 76 153 153 198 266
Hydraulic delay time (sec.) 30 – 150 30 – 150 30 – 150 30 – 150 30 – 150
Torsional Limit (N·m) 18 000 40 000 49 000 84 000 189 000
Tensile Yield (daN) 125 000 280 000 320 000 365 000 738 000
Nominal Up Latch Setting (daN) 16 300 – 25 000 32 000 – 59 000 32 000 – 59 000 45 000 – 70 000 45 000 – 70 000
Nominal Down Latch Setting (daN 5 700 – 18 700 12 000 – 44 200 12 000 – 44 200 14 300 – 54 400 14 300 – 54 400
Max Pull During Delay (daN) 34 600 80 000 86 000 110 000 140 000
Free stroke up (mm) 230 230 230 230 230
Free stroke down (mm) 150 150 150 150 150
Weight (kg) 340 730 874 1300 1850
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