Double-Acting
Hydraulic Mechanical Drilling Jars
103
Double Acting Hydraulic Mechanical Drilling Jars
Series
431
442
428
440
441
480
411
444
437
Nominal size
inches
4.75
6.25
6.50
6.75
7.00
7.12
8.00
9.00
9.50
(+API Drill Collar Tolerance)
(mm)
(121)
(159)
(165)
(171)
(178)
(181)
(203)
(229)
(241)
Max. sug Hole Diameter
inches
7 7/8
9 7/8
9 7/8
12 1/4
12 1/4
12 1/4
17 1/2
26
26
Hole openers not sug.
(mm)
(200)
(251)
(251)
(311)
(311)
(311)
(445)
(660)
(660)
ID
inches
2.25
2.25
2.25
2.50
2.50
2.50
2.81
3.00
3.00
(mm)
(57)
(57)
(57)
(64)
(64)
(64)
(71)
(76)
(76)
Length (Latched)
feet
19.8
22.5
22.5
23.0
23.0
23.0
22.5
23.0
23.0
(m)
(6.0)
(6.9)
(6.9)
(7.0)
(7.0)
(7.0)
(6.9)
(7.0)
(7.0)
Weight
lbs
850
2,000
2,100
2,250
2,450
2,450
3,100
4,600
5,200
(kg)
(390)
(910)
(950)
(1 020)
(1 110)
(1,110)
(1 410)
(2 090)
(2 360)
Stroke Up (Free Stroke)
inches
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
(mm)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
Stroke Down (Free Stroke)
inches
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
(mm)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
Preset Release Up
STD:
lbf
40,000
90,000
90,000
90,000
90,000
90,000
95,000
100,000
100,000
(kN)
(180)
(400)
(400)
(400)
(400)
(400)
(420)
(440)
(440)
MAX:
lbf
55,000
140,000
140,000
140,000
140,000
140,000
150,000
155,000
155,000
(kN)
(240)
(620)
(620)
(620)
(620)
(620)
(670)
(690)
(690)
Preset Release Down STD:
lbf
18,000
40,500
40,500
40,500
40,500
40,500
42,800
45,000
45,000
(Tolerance +/- 5%)
(kN)
(80)
(180)
(180)
(180)
(180)
(180)
(190)
(200)
(200)
MAX:
lbf
27,000
63,000
63,000
63,000
63,000
63,000
67,500
69,800
69,800
(kN)
(120)
(280)
(280)
(280)
(280)
(280)
(300)
(310)
(310)
Maximum Load During
lbf
84,000
160,000
160,000
190,000
190,000
190,000
300,000
350,000
350,000
Hydraulic Delay
(kN)
(370)
(710)
(710)
(850)
(850)
(850)
(1 300)
(1 600)
(1 600)
Maximum Tensile
lbf
362,000
755,000
755,000
823,000
823,000
1,000,000
1,000,000
1,225,000
1,225,000
Load After Jarring
(kN)
(1 600)
(3 400)
(3 400)
(3 700)
(3 700)
(4 400)
(4 400)
(5 400)
(5 400)
Maximum Torsional Load
lbf–ft
11,500
37,500
37,500
44,500
44,500
70,000
73,500
95,000
95,000
(To Yield Body Connections)
(N.m)
(15 600)
(50 800)
(50 800)
(60 300)
(60 300)
(94 900)
(99 700)
(128 000)
(128 800)
Torsion Ld To Yield Splines
lbf–ft
28,500
62,000
62,000
74,500
74,500
100,000
102,000
136,000
136,000
(Reference Only)
(N.m)
(38 600)
(84 100)
(84 100)
(101 000)
(101 000)
(135 600)
(138 300)
(184 400)
(184 400)
Pump Open Area
sq.in.
6.5
9.6
9.6
11.0
11.0
11.0
14.2
15.9
15.9
(sq.cm)
(42)
(62)
(62)
(71)
(71)
(71)
(92)
(103)
(103)
GRIFFITH • VECTOR DOUBLE-ACTING
HYDRAULIC MECHANICAL DRILLING JARS
This jar combines the latch with hydraulic delay in both directions.
All features of the Hydraulic Mechanical Jar are available with this tool,
and operation of the tool is similar, but the hydraulic jar down requires a
slight change of procedure.
To jar downward, apply a compression load to the jar in excess
of the down-latch setting. This will release the mechanical latch and
initiate the hydraulic delay sequence. Following the delay period, the
jar will release, causing a downward jarring impact. Raising the drill
string will re-engage the mechanical latch ready for further jarring, or
to resume normal drilling as required.
FEATURES OF THE GRIFFITH • VECTOR DOUBLE-ACTING
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.
To order: specify O.D., connections, bottom hole temperature.
Specifications subject to change without notice
• 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 and down jarring allows the operator to vary
jarring force downhole.
• 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 and
less wear.
• Available dressed for 300 or 400°F bottom hole temperatures.
DOUBLE ACTING HYDRAULIC MECHANICAL DRILLING JAR
