Hydraulic Mechanical
Drilling Jars
102
Series
341
380
447
339
474
340
450
336-20
354
381
Tool O.D.
inches
4.75
4.75
6.25
6.50
6.50
6.75
7.00
8.00
9.00
9.50
(+API Drill Collar Tolerance)
(mm)
(121)
(121)
(159)
(165)
(165)
(171)
(178)
(203)
(229)
(241)
Max. Recom’d Hole Diameter
inches
7 7/8
7 7/8
9 7/8
9 7/8
12 1/4
12 1/4
17 1/2
26
26
Hole openers not recommended
(mm)
(200)
(200)
(251)
(251)
(311)
(311)
(445)
(660)
(660)
Tool I.D.
inches
2.00
2.25
2.25
2.25
2.75
2.50
2.50
2.81
2.81
2.81
(mm)
(51)
(57)
(57)
(57)
(70)
(64)
(64)
(71)
(71)
(71)
Length (Latched)
feet
12.5
12.7
16.3
16.3
18.5
15.0
15.0
15.5
15.0
15.0
(m)
(3.8)
(3.9)
(5.0)
(5.0)
(5.6)
(4.6)
(4.6)
(4.7)
(4.6)
(4.6)
Weight
lbs
575
550
1,300
1,400
1,500
1,400
1,540
2,200
2,700
3,000
(kg)
(260)
(250)
(590)
(640)
(680)
(640)
(700)
(1000)
(1 200)
(1 400)
Stroke Up (Free Stroke)
inches
4.0
4.0
4.5
4.5
10.0
4.5
4.5
5.0
5.0
5.0
(mm)
(102)
(102)
(114)
(114)
2.54
(114)
(147)
(127)
(127)
(127)
Stroke Down
inches
4.0
4.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
(mm)
(102)
(102)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
Preset Release Up
STD.:
lb
40,000
40,000
90,000
90,000
90,000
90,000
90,000
95,000
100,000
100,000
(Down =45% of Up)
(daN)
(18 000)
(18 000)
(40 000)
(40 000)
(40 000)
(40 000)
(40 000)
(42 000)
(44 000)
(44 000)
MAX.:
lb
55,000
55,000
140,000
140,000
140,000
140,000
140,000
150,000
155,000
155,000
(daN)
(24 000)
(24 000)
(62 000)
(62 000)
(62 000)
(62 000)
(62 000)
(67 000)
(69 000)
(69 000)
Maximum Load During
lb
85,000
75,000
160,000
160,000
180,000
190,000
190,000
220,000
250,000
250,000
Hydraulic Delay
(daN)
(38 000)
(33 000)
(71 000)
(71 000)
(80 000)
(85 000)
(85 000)
(98 000)
(111 000)
(111 000)
Maximum Tensile Load
lb
416,000
354,000
755,000
755,000
865,000
828,000
828,000
965,000
1,225,000
1,225,000
After Jarring
(daN)
(185 000)
(157 000)
(336 000)
(336 000) (385 000)
(368 000)
(368 000)
(429 000)
(545 000)
(545 000)
Maximum Torsional Load
lb-ft
16,000
16,000
41,000
41,000
41,000
40,000
40,000
68,000
110,000
112,000
(To Yield Body Connections)
(Nm)
(22 000)
(22 000)
(56 000)
(56 000)
(56 000)
(54 000)
(54 000)
(92 000)
(149 000)
(152 000)
Pump Open Area
in2
6.0
6.5
9.6
9.6
11.0
11.0
11.0
14.2
15.9
15.9
(cm2)
(39)
(42)
(62)
(62)
(71)
(71)
(71)
(92)
(103)
(103)
GRIFFITH • VECTOR HYDRAULIC
MECHANICAL DRILLING JARS
This drilling jar is well suited for virtually all drilling operations. The jar
was developed to overcome the usual shortcomings associated with
purely hydraulic or mechanical jars, yet retain the advantages of both
concepts. This jar combines our mechanical “safety” latch with a
hydraulic delay sequence on the up jarring stroke. The down jarring
stroke is achieved mechanically. To jar upward, overpull is applied to
the drill string until the preset mechanical latch setting is overcome and
the jar enters the hydraulic delay sequence. The desired overpull
above free string weight is then taken as the jar continues to slowly
open under hydraulic restriction (delay) with the drawworks brake
applied. After the hydraulic delay, the jar enters the free stroke and the
mandrel accelerates to the fully extended position creating a jarring
impact. Simply lowering the drill string resets the latch. The jar is then
ready for another jarring cycle or to resume normal drilling operations.
To jar down, the drill string is lowered until the compressive force
applied to the jar exceeds the preset mechanical latch setting. The
latch releases allowing the mandrel to accelerate to the fully closed
position creating a downward jarring impact. Raising the drill string
until free movement stops indicates the latch has reset. The jar is
ready for another jarring cycle or to resume normal drilling operations.
FEATURES OF THE GRIFFITH • VECTOR
HYDRAULIC MECHANICAL DRILLING JAR
• Will not fire unexpectedly while drilling, tripping, making
connections, or tagging bottom.
• No safety clamp or special handling procedures required on
the rig floor.
• Less restricted jar placement in the BHA. The jar can be placed
in tension, neutral or compression.
• Ideal for use in compression as there is no need to wait for “bleed
through” when tagging or picking up off bottom.
• Ideal for use in directional or extended reach horizontal wells,
the jar can be run in the lower BHA in compression or in the
upper BHA in tension.
• No special tripping or drilling procedures required.
• Linear latch not affected by torque. Ideal for use in high friction,
directional and extended reach horizontal wells.
• Simple up and down motion to operate.
• Adjustable latch release settings.
• Mechanical latch prevents wear of the tool during drilling
operations.
• Hydraulic delay up jarring allows the operator to vary jarring
force downhole by changing overpull.
• Allows drawworks brake to be applied to protect hoisting
equipment.
• Special metering devices maintain relatively constant delay
timing even after prolonged jarring.
• Fully sealed and oil bath lubricated for longer service life.
• Available dressed for 300°F or 400°F bottom hole temperatures.
Hydraulic/Mechanical Drilling Jars
To order: specify O.D., connections, bottom hole temperature.
Specifications subject to change without notice
HYDRAULIC/MECHANICAL JAR
