Product Overview
Our bi-directional hydraulic jar delivers both upward and downward impact force for downhole fishing, stuck pipe recovery and well intervention operations. It contains separate hydraulic chambers for upward and downward jarring strokes; operators first apply set-down weight or pick-up tension to charge the corresponding hydraulic chamber, then the tool releases suddenly after a predetermined delay to generate powerful impact in the desired direction, providing full bidirectional jarring capacity without rotating or manipulating the string direction. This design eliminates the need for separate upward and downward jars in the bottom hole assembly, significantly reducing BHA length and complexity. High-strength alloy steel construction with hardened internal components ensures reliable performance after repeated jarring cycles. Multi-layer dynamic sealing isolates clean hydraulic oil from wellbore fluids. Sour-grade material options complying with NACE MR0175 / ISO 15156 standards are available for H₂S and CO₂ corrosive well environments.
Core Features & Benefits
- Single tool delivers both upward and downward hydraulic jarring impact
- Separate hydraulic chambers for independent up and down jar timing adjustment
- No string rotation required to switch between up and down jarring modes
- Adjustable jarring intensity by controlling surface pull or set-down load
- Hardened internal impact components resist wear after repeated high-force strikes
- Multi-layer dynamic sealing system isolates hydraulic oil from wellbore fluids
- Compact integrated design shortens BHA length compared to separate up/down jar assemblies
- NACE MR0175 / ISO 15156 sour service material options for H₂S wells
- Field adjustable delay time for customized jarring response
- Custom thread connections and size ranges available
Technical Specifications
| Model No. | Tool OD | Internal Bore | Connection | Overall Length | Up Jar Impact Force | Down Jar Impact Force | Max Tensile Load | Working Pressure | Temp Range |
|---|---|---|---|---|---|---|---|---|---|
| BHJ-150 | 1.687" | 0.625" | 1" AMMT | 72" | 15,000 lbs | 10,000 lbs | 30,000 lbs | 10,000 PSI | 0°F~350°F |
| BHJ-175 | 1.750" | 0.750" | 1" AMMT | 78" | 20,000 lbs | 12,000 lbs | 35,000 lbs | 10,000 PSI | 0°F~350°F |
| BHJ-200 | 2.250" | 1.000" | 1 1/2" AMMT | 84" | 30,000 lbs | 20,000 lbs | 50,000 lbs | 10,000 PSI | 0°F~350°F |
| BHJ-250 | 2.875" | 1.250" | 2 3/8" PAC | 90" | 45,000 lbs | 30,000 lbs | 70,000 lbs | 10,000 PSI | 0°F~350°F |
Note: Custom impact force, delay time, thread types and material grades available upon request.
Typical Applications
- Upward jarring to recover stuck coiled tubing, fishing tools and packers
- Downward jarring to break sand compaction, free stuck bottom debris and unseating bridge plugs
- Complex fishing operations in deviated and horizontal wells with multi-direction jamming
- Sour well fishing intervention under H₂S/CO₂ corrosive conditions
- Slickline / wireline heavy duty bidirectional jarring jobs
- Workover for deep vertical wells with variable stuck positions
- Combined usage with hydraulic accelerators for ultra-high impact fishing tasks
Advantages Over Single-Direction Jars
- Single combined tool replaces separate up and down jars, shortens total BHA length and reduces connection points
- No rotational manipulation required to switch jarring direction, simplifies surface operation procedure
- Independent hydraulic delay adjustment for up and down strikes allows optimized jarring strategy for each specific stuck scenario
- Consistent jarring force output across multiple repeat strikes without performance degradation
- Field-proven reliability in deep, high-angle and extended reach fishing operations
- Reduced BHA connection count lowers potential leak paths and weak points
FAQ
Q: How does the bi-directional jar switch between up and down jarring modes?
A: Simply by applying tension for upward jarring or set-down weight for downward jarring. The tool automatically engages the corresponding hydraulic chamber without any string rotation.
Q: Can the jarring impact force be adjusted?
A: Yes, the impact intensity can be adjusted by varying the surface pull load or set-down weight. The delay time can also be field adjusted.
Q: What sizes are available?
A: Standard tool OD ranges from 1.687" to 2.875". Custom sizes and thread connections are available upon request.
Q: Is a sour service version available?
A: Yes, NACE MR0175 / ISO 15156 compliant material options are available for H₂S service.
Get Custom Datasheet & Factory Quote
We manufacture full series downhole fishing tools with rigorous quality control and complete certification. Contact us with your tool size, impact force requirements and well conditions for detailed datasheet and competitive factory quotation.
