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Access multiple NOV applications and services with one login.
Register here Sign inGriffith Double-Acting Hydraulic/Mechanical Drilling Jar
Our double-acting hydraulic/mechanical drilling jar is a versatile jar for complex drilling applications that features a hydraulic upstroke and downstroke with a mechanical latch.
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Description
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Resources
Description
Similar to our standard hydraulic/mechanical jar (HMJ) in design and operation, the benefits of a hydraulic delay downstroke make the double-acting hydraulic/mechanical drilling jar (DAHMJ) more effective for directional, horizontal, and extended-reach drilling. Additionally, no bleed-through operation is required when tagging or picking up off the bottom, making the DAHMJ ideal for compressional placement in the drill string.
Features/Benefits
- More effective jarring – Hydraulic delay in both upstroke and downstroke
- Engineered for high-friction directional, horizontal, and extended-reach wells – Allows weight stacking before firing, even while horizontal
- Continuous, consistent performance – Modified fluid shearing technology from the aerospace industry provides reliable firing
- Improved safety on the rig floor – The internal mechanical latch prevents unexpected jarring when making connections or drilling and eliminates the need for an external safety collar
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