DJ6 Oilfield Drilling Jar

High-Impact. Versatile. Durable.

The DJ6’s proprietary internal latch eliminates the need for external jar clamp and prevents the jar from misfiring downhole.


Overview

THE CHALLENGE

When your drill string is stuck downhole, you need a high-impact drilling jar to apply force to the stuck point in the drill string. This frees the drill string and allows you to continue drilling ahead or pull out of the hole.

Oilfield drilling jars create a delayed hammer-anvil effect, either hydraulically or mechanically.

With a hydraulic drilling jar, once the latch is released, the tool goes into metering mode. It compresses fluid until the release pressure is accomplished. At that point the fluid is released and the hammer impacts the anvil, applying a fixed force to the string.

With a mechanical drilling jar, the use of heavy drill collars or heavy weight drill pipe is key to creating a strong impact force. This is accomplished by overcoming a fixed latch setting and releasing the string weight (hammer) to the tool (anvil), applying a fixed force to the drill string.

Either type of jar can work in downward jarring operations. However, only hydraulic or hydra-mechanic drilling jars can fire upward.

The solution

Our oilfield drilling jars are among the toughest and most durable in the industry. With reliable, state-of-the-art design, they’re ideal for directional, horizontal and deep hole applications, on and offshore.

As part of the Cougar Drilling Solutions’ fleet of downhole drilling tools, the DJ6 fires up hydraulically and down mechanically. It employs a proprietary internal latch to prevent accidental firing downhole. It’s available in 3.50” to 9.50” OD.

Benefits

DJ6 OILFIELD DRILLING JAR BENEFITS

  • Cougar proprietary internal latch prevents jar from misfiring downhole
  • No need for external jar clamp on surface
  • Standard operating temperatures up to 250°F (121°C)
  • Seals available for temperatures up to 450°F (232°C)
  • Adjustable configuration for optimized firing impact force
  • Maximum stroke length for increased impact force
  • Ability to reset latch and return to drilling without pulling out of hole

Specs

ENGLISH UNITS

OD
(in.)
ID
(in.)
Length
(ft.)
Weight
(lb.)
Latch Setting
Range (lb.)
Maximum Pull
for Firing (lb.)
Maximum Pull
after Firing (lb.)
Pump Open
Area (in.²)
Maximum
Torque (ft.-lb.)
11/8194000–36,000*
54,000195,000
4.9
5,000
21/4188000–45,000*
84,000380,000
11.0
17,000
181,3000–110,000*156,000
685,000
16.8
40,000
2⅝181,4300–110,000*179,000625,00018.740,000
8213/16202,0400–130,000*291,0001,150,00028.2 68,000
9213/16222,6600–145,000*
361,000
1,500,000
33.2
121,000
213/16203,1500–145,000*361,0001,500,00033.2141,000

* Down lock loads will typically be 60-70% of the up value.

SI UNITS

OD
(mm)
ID
(mm)
Length
(m)
Weight
(kg)
Latch Setting
Range (daN)
Maximum Pull
for Firing (daN)
Maximum Pull
after Firing (daN)
Pump Open
Area (cm²)
Maximum
Torque (Nm)
89295.81800–16,000*
24,20089,000
17.8
6,700
121575.53600–20,000*
37,400169,000
71.0
29,800
16566 5.55900–50,000*69,400
311,400
108.4
67,700
171665.56500–50,000*79,400311,400
12058,300
203716.19250–60,000*129,400511,550181.9142,300
229716.712100–65,000*
160,600
667,200
214.2
164,000
241716.114300–65,000*
160,600667,200214.2
191,000

* Down lock loads will typically be 60-70% of the up value


Published torque specs based on ‘high torque’ configuration and materials. Please contact your Cougar Drilling Solutions sales agent for accurate torque specs on all available models.

Resources

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