Shock Tools
107
The Griffith • Vector Shock Tool is designed to isolate the drill string from
axial deflections produced by the bit during drilling operations. This reduces
impact on the bit and drill string and increases penetration rates by keeping
the bit on bottom during rough drilling conditions.
FEATURES
• Will not build angle, as it is well stabilized between barrel and
mandrel.
• Reduces bit bounce and extends bit life by reducing
impact loads on teeth and bearings.
• Reduces shock and vibration induced drill string failures.
• Reduces damage to surface equipment.
• Unaffected by hydrostatic pressure.
Constant load/deflection characteristics are maintained regardless of hole
depth, bit weight, pump pressure, mud weight or torque. Free vertical
movement is assured by guiding the mandrel in the barrel above and below
the spline drive to prevent lateral loads from acting on the drive assembly.
Griffith • Vector Shock Tools are sprung in both directions to compensate for
pump open forces.
The Griffith • Vector Shock Tool contains a chamber and piston to
compensate for lubricant expansion at higher operating temperatures.
Larger diameter (11” to 14”) tools are designed with a pressure
compensation system to reduce the excessive pump open effect inherent in
larger diameter tools. This design permits a relatively low spring rate,
desirable when drilling large diameter holes, without fully extending the tool
at high pump pressure. 14” shock tools are available with an optional
reamer sub for 17 1/2” hole size.
Griffith • Vector Shock Tools are available with a standard seal kit rated
to 200°F or an optional higher temperature seal kit rated at 350°F.
“HOT HOLE” APPLICATIONS
We also manufacture Griffith • Vector shock tools designed for “hot hole”
applications with seals rated above 350°F. The design and features of the
“hot hole” tools are similar to the standard tools with the exception of the
sealing system required for the high temperature application.
COILED TUBING SHOCK TOOLS
Small diameter shock tools are designed and manufactured specifically for
coiled tubing applications. Like the larger diameter tools, they are used to
dampen vibrations induced during coiled tubing drilling and increase ROP.
SHOCK TOOL WITH PRESSURE COMPENSATION
SHOCK TOOL
Shock Tool Specifications
Series
155
146
150
147
154
148
160
139
151
157
143
113
Nominal Size
inches
4.75
6.25
6.50
6.75
7.00
8.00
8.00
9.00
9.50
11.00
12.00
14.00
(+API Drill Collar Toler.)
(mm)
(121)
(159)
(165)
(171)
(178)
(203)
(203)
(229)
(241)
(279)
(305)
(356)
Max. Sug. Hole Dia inches
6 3/4
8 1/2
8 1/2
8 3/4
8 3/4
12 1/4
12 1/4
13 3/4
17 1/2
17 1/2
17 1/2
26
Hole openers not sug.
(mm)
(171)
(216)
(216)
(222)
(222)
(311)
(311)
(349)
(445)
(445)
(445)
(660)
ID
inches
2.00
2.00
2.00
2.25
2.25
2.50
2.75
2.81
2.81
2.81
2.81
3.00
(mm)
(51)
(51)
(51)
(57)
(57)
(64)
(70)
(71)
(71)
(71)
(71)
(76)
Length
feet
8.5
9.4
9.4
9.4
9.4
9.4
12.5
9.4
10.8
14.0
12.2
15.0
(m)
(2.59)
(2.87)
(2.87)
(2.87)
(2.87)
(2.87)
(3.81)
(2.87)
(3.29)
(4.27)
(3.72)
(4.57)
Weight
lbs
375
720
800
850
930
1,200
1,600
1,500
2,200
3,200
3,400
5,200
(kg)
(170)
(330)
(360)
(390)
(420)
(540)
(730)
(680)
(1 000)
(1 500)
(1 500)
(2 400)
Axial Load To Fully
lb
74,000
100,000
100,000
100,000
100,000
125,000
125,000
110,000
100,000
100,000
100,000
140,000
Compress Tool
(daN)
(33 000)
(44 000)
(44 000)
(44 000)
(44 000)
(56 000)
(56 000)
(49 000)
(44 000)
(44 000)
(44 000)
(62 000)
Tensile Load
lb
380,000
555,000
555,000
593,000
593,000
770,000
872,000
853,000
1,207,000
808,000
1,337,000
1,865,000
At Yield
(daN)
(169 000)
(247 000)
(247 000)
(264 000)
(264 000)
(342 000)
(388 000)
(379 000)
(537 000)
(362 000)
(599 000)
(836 000)
Max. Torsional Load
lb–ft
17,000
41,000
50,000
54,000
54,000
79,000
79,000
115,000
109,000
187,000
244,000
400,000
(To Yield Body Connect)
(Nm)
(23 000)
(56 000)
(68 000)
(73 000)
(73 000)
(107 000)
(107 000)
(156 000)
(148 000)
(254 000)
(331 000)
(542 000)
Pump Open Area
in2
11.0
15.9
15.9
17.7
17.7
23.8
30.7
30.7
38.5
11.0
11.8
12.6
(cm2)
(71)
(103)
(103)
(114)
(114)
(154)
(198)
(198)
(248)
(71)
(76)
(81)
Spring Rate
lb/in.
29,000
35,000
35,000
35,000
35,000
35,000
31,000
35,000
25,000
15,000
15,000
22,000
(N/mm)
(5 100)
(6 100)
(6 100)
(6 100)
(6 100)
(6 100)
(5 400)
(6 100)
(4 400)
(2 600)
(2 600)
(3 900)
Opening Travel
inches
1.0
1.75
1.75
1.75
1.75
1.75
1.75
1.75
3.30
2.50
2.50
2.00
(mm)
(25)
(44)
(44)
(44)
(44)
(44)
(44)
(44)
(84)
(64)
(64)
(51)
Closing Travel
inches
2.5
2.9
2.9
3.0
3.0
3.6
4.0
3.2
4.0
7.0
7.0
7.0
(mm)
(64)
(74)
(74)
(76)
(76)
(91)
(102)
(81)
(102)
(178)
(178)
(178)
To order: specify O.D., connections, bottom hole temperature.Specifications subject to change without notice
