The Cougar Drilling Solutions DJ6 Drilling Jar is one of the toughest and most durable jars in the oil industry. Designed and operated for a wide range of applications, this jar is ideal for directional, horizontal and deep hole applications, both on and off shore. With its reliable, state-of-the-art design, the Cougar DJ6 Drilling Jar is a proven performer worldwide.
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In order to fire the jar upwards, the operator must determine the force or pull required to unlatch the jar to begin metering the jar.
Pulling force = lock setting + buoyed drill string weight above the jar + hole drag – pump open force.
(Pump open force = pump open area x pressure drop across bit)
Once this pull force is exceeded and applied to the jar, it will unlatch and begin the metering sequence. At this time, the jar can be pulled with more or less force to increase or decrease impact. The force or pull used will determine the delay time of the jar until impact.
To fire the jar down, the drill string is lowered applying weight to the latch exceeding the preset mechanical latch setting. At that point, the latch will release allowing the jar to travel freely until the jar closes, creating a downward blow.
Raising the drill string until free movement stops will indicate that the mechanical latch is reset. The jar is then ready to be fired once again in either direction.
Drill collars will enhance the jar’s performance and increase its impact. The harder the jar is pulled, the greater the impact. The lighter it’s pulled the softer the impact. (Maximum pre-firing information is provided in this brochure)
Cougar DS recommends running the jars in the lower section of the drill collars if possible. Cougar DS Drilling Jars should not run in the neutral point.
For maximum pre-firing pull, see the DJ6 specifications table provided with this brochure. Once the jar has pulled through the mechanical latch, and the metering of the jar has been completed, then the jar will fire. Repeat the procedure by lowering the drillstring, re-latching the jar.
|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.)||Total Stroke (in.)||Free Stroke Up (in.)||Free Stroke Down (in.)|
|3½||11/8||18.0||450||0 - 36,000*||54,000||160,000||4.9||5,000||18||6||5|
|4¾||21/4||17.0||700||0 - 55,000*||84,000||401,000||11.0||19,000||17||6||6|
|6½||2½||17.5||1,400||0 - 110,000*||175,000||690,000||16.8||41,000||15||6||6|
|6¾||2⅝||17.5||1,500||0 - 110,000*||179,000||630,000||18.7||41,000||15||6||6|
|8||213/16||19||2,300||0 - 130,000*||291,000||1,215,000||28.2||83,000||18||6||9|
|9||213/16||19.5||3,100||0 - 145,000*||361,000||1,500,000||33.2||121,000||18||6||9|
|9½||213/16||19.5||3,200||0 - 145,000*||361,000||1,500,000||33.2||141,000||18||6||9|
* Down lock loads will typically be 60-70% of the up value.
|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)||Total Stroke (mm)||Free Stroke Up (mm)||Free Stroke Down (mm)|
|89||29||5.5||204||0 - 16,000*||24,200||89,000||17.8||6,700||457||152||127|
|121||57||5.2||318||0 - 24,000*||37,400||169,000||71.0||29,800||432||152||152|
|165||63.5||5.3||635||0 - 50,000*||77,800||341,600||108.4||67,700||381||152||152|
|171||66||5.3||680||0 - 50,000*||79,400||378,000||120||58,300||381||152||152|
|203||71||5.8||1,043||0 - 60,000*||129,400||511,550||181.9||142,300||457||152||229|
|229||71||5.9||1,406||0 - 65,000*||160,600||667,200||214.2||164,000||457||152||229|
|241||71||5.9||1,452||0 - 65,000*||160,600||667,200||214.2||191,000||457||152||229|
* 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.
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