Product Overview
The Bi-Direction Mechanical Jar is a spring-actuated bidirectional mechanical fishing jar specially developed for coiled tubing downhole junk fishing intervention operations. It adopts an optimized compact mechanical structural layout with outstanding comprehensive advantages including short overall make-up length, simplified internal mechanism, minimal performance variation caused by downhole well temperature, and convenient daily disassembly maintenance.
This bidirectional mechanical jar relies on stacked disc spring components as energy storage elements to realize controllable upward jarring impact and downward jarring impact. The release jarring force can be flexibly customized to meet different downhole fishing load requirements: construction engineers adjust the output impact magnitude by modifying the quantity of internal disc spring stacks and changing the pre-compression preload of the spring assembly, realizing wide-range adjustable jarring force without replacing the entire jar body.
Different from hydraulic delay type jarring tools, the mechanical jar eliminates hydraulic fluid delay medium; its spring mechanical actuation principle is barely affected by changes in downhole well temperature, avoiding jarring performance attenuation caused by hydraulic oil viscosity variation under high or low well temperature environments, and maintaining stable impact energy output across variable well temperature conditions. The tool integrates a high torque through structural design, which can stably transmit large rotary torque loads generated by downhole milling motors during fishing construction, and will not produce mechanical jamming or structural deformation under high-torque rotary working conditions.
The Bi-Direction Mechanical Jar is specially designed and optimized for downhole junk fishing heavy workover operations, and can be matched with fishing necks, hydraulic disconnects and other downhole fishing tool components to form a complete coiled tubing fishing workover string assembly.
The standardized product lineup covers outer diameter sizes ranging from 1-3/4" to 3-1/8", with matched closed make-up length and fixed stroke specifications, equipped with standard 1"AMMT, 1-1/2"AMMT and 2-3/8"PAC bottom connection threads for universal compatibility with mainstream coiled tubing connectors, fishing necks, hydraulic release disconnects and other downhole fishing workover service tools. Custom outer diameter, disc spring stack configuration quantity and pre-compression load adjustment range customization are available upon customer technical drawing submission.
Complete Technical Specification Table
| PN Part Number | Outer Diameter OD | Inner Diameter ID | Make-Up Length (Closed) | Stroke | Working Condition Grade | Bottom Connection Thread |
|---|---|---|---|---|---|---|
| L3041750120 | 1-3/4" | 0.39" | 34.2" | 5.7" | STD Standard | 1" AMMT |
| L3042125120 | 2-1/8" | 0.47" | 50.2" | 10" | STD Standard | 1-1/2" AMMT |
| L3042875120 | 2-7/8" | 0.87" | 53.1" | 10" | STD Standard | 2-3/8" PAC |
| L3043125120 | 3-1/8" | 1" | 56" | 10" | STD Standard | 2-3/8" PAC |
Note: Custom outer diameter, customized disc spring stack quantity configuration, spring pre-compression load adjustment range modification bi-direction mechanical jars are available via engineering consultation.
Core Features & Advantages
Short Compact Overall Length & Simplified Internal Mechanical Structure: Optimized compact mechanical layout shortens the closed make-up length of the jar compared with hydraulic jarring tools, simplifying the overall coiled tubing fishing tool string layout and reducing tubing drag resistance during running-in and pulling-out trips.
Minimal Well Temperature Sensitivity, Stable Jarring Performance: Disc spring mechanical energy storage actuation principle removes dependency on hydraulic delay medium, jarring output performance will not be interfered by viscosity changes of hydraulic fluid under high/low downhole temperature, maintaining consistent controllable bidirectional impact energy across variable well temperature working conditions.
Fully Adjustable Jarring Release Force by Spring Configuration: The magnitude of bidirectional jarring impact force can be flexibly customized to adapt to different fishing load requirements; construction personnel can adjust the output impact magnitude by changing the quantity of internal disc spring stacks and modifying the pre-compression preload of the spring assembly, without replacing the whole jar body.
High Torque Through Bearing Structural Design: Built-in high-strength torque transmission matching structure, the jar can stably bear and transmit large rotary torque loads generated by downhole milling motors during fishing construction, effectively avoiding mechanical jamming, sliding or structural deformation failure under high-torque rotary working conditions.
Convenient Disassembly & Routine Maintenance Design: The split mechanical assembly structure supports quick disassembly of the jar body on wellsite for internal spring inspection, wear part replacement and spring preload adjustment operations, greatly reducing the time cost of routine maintenance and post-operation inspection.
Dedicated Optimization for Downhole Junk Fishing Operations: The bidirectional mechanical jar’s spring energy storage impact logic is optimized for stuck junk release fishing construction scenarios, matched with supporting fishing necks and hydraulic disconnects to form a complete integrated coiled tubing fishing workover string solution.
Full Outer Diameter Size Compatibility: Standard product series covers 1-3/4", 2-1/8", 2-7/8" and 3-1/8" outer diameter specifications, fully compatible with global mainstream medium-size coiled tubing assemblies for all bidirectional mechanical jarring junk fishing intervention demands.
Multi-Type Standard Thread Compatibility: All product models are equipped with universal 1"AMMT, 1-1/2"AMMT and 2-3/8"PAC bottom connection threads, realizing seamless assembly with global mainstream coiled tubing bottom-hole assemblies, fishing necks and hydraulic release disconnects without extra conversion subs.
Precision CNC High-Strength Alloy Manufacturing: Adopts precision CNC machining integral jar body, disc spring stack assembly, mechanical impact transmission matching components and torque bearing structure, featuring outstanding repeated impact fatigue resistance, high-torque load bearing capacity and structural stability, extending long-term continuous bidirectional jarring junk fishing service life.
Application Scenarios
1. Coiled tubing downhole junk fishing heavy-load intervention jarring treatments including stuck metal junk release, dropped tool recovery and stuck pipe release fishing construction operations
2. Conventional sweet crude oilfield bidirectional spring mechanical jar adjustable impact force junk fishing heavy workover service (STD standard service grade)
3. Downhole junk fishing heavy workover projects requiring temperature-insensitive stable bidirectional jarring impact, adjustable spring release force and high torque through capability for milling-fishing combined construction
4. Long-term continuous repeated bidirectional mechanical spring jarring safety protection for coiled tubing bottom-hole assemblies in onshore and offshore oilfield junk fishing heavy workover intervention projects
Standard Delivery Package
Complete bi-direction mechanical jar integral pre-assembled unit including multi-stack disc spring energy storage assembly, bidirectional mechanical impact transmission structure and standard bottom connection thread
Spare interchangeable disc spring stack kit with multiple spring stiffness specifications for on-site jarring force adjustment configuration
Full factory inspection test report including repeated bidirectional impact fatigue resistance test, integral tensile load test, high-torque rotary bearing calibration test and disc spring release impact force adjustment performance test data
Product dimension drawing and official installation & operation maintenance instruction manual, with detailed guidance for on-site disassembly, spring quantity adjustment and pre-compression load setting operations
Quality Warranty & After-Sales Service
Warranty Coverage: 12 months after factory shipment or 2000 cumulative bidirectional jarring impact cycles, whichever condition is reached first
Full factory inspection: Each finished bi-direction mechanical jar passes integral tensile load test, repeated bidirectional impact cycle fatigue test, high-torque rotary bearing calibration test and disc spring release impact force adjustment performance test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing junk fishing heavy workover tool string matching, outer diameter & disc spring stack configuration selection and spring pre-compression load adjustment consultation free of charge
Long-term spare parts supply: All interchangeable disc spring stack wear accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom outer diameters, customized disc spring stack quantity configuration, spring pre-compression load adjustment range modification, bottom thread profiles and special size bi-direction mechanical jars based on customer technical drawings
FAQ
Q1: What is the core function of a Bi-Direction Mechanical Jar??
The Bi-Direction Mechanical Jar is a spring energy storage bidirectional mechanical fishing jar for coiled tubing junk fishing workover. It features short compact length, simplified mechanical structure, low temperature sensitivity and easy maintenance. The jarring release force is fully adjustable by modifying internal disc spring quantity and pre-compression preload, and it has high torque through bearing capability. It relies on mechanical disc springs to generate both upward and downward jarring impact, and is specially designed for all types of downhole junk fishing recovery operations.
Q2: What three core structural advantages does this bi-direction mechanical jar own??
1. Short compact integral length with simplified internal mechanical layout, shorter closed make-up length than hydraulic jarring tools, simplifying fishing tool string layout and reducing tubing drag during running-in and pulling-out trips; 2. Minimal downhole temperature sensitivity, spring mechanical energy storage actuation eliminates hydraulic delay medium dependency, jarring impact output will not be disturbed by hydraulic oil viscosity variation under high or low well temperature, maintaining stable consistent jarring performance across variable well temperature working environments; 3. Fully adjustable jarring release force paired with high torque through bearing design: construction personnel can tune bidirectional impact magnitude by changing internal disc spring stack quantity and pre-compression preload to match different fishing load demands, while the high torque through structural design enables stable bearing and transmission of large rotary torque loads generated by downhole milling motors during combined milling-fishing construction.
Q3: What outer diameter sizes do these bi-direction mechanical jars support??
Our standard production lineup fully covers outer diameters: 1-3/4", 2-1/8", 2-7/8" and 3-1/8". All models adopt universal 1"AMMT, 1-1/2"AMMT and 2-3/8"PAC bottom connection threads compatible with global mainstream coiled tubing connector assemblies, fishing necks and hydraulic release disconnect downhole tools.
Q4: What is the standard production lead time for bulk purchase orders??
All standard PN part numbers are kept in factory inventory, goods can be delivered within 7–15 working days. Customized bi-direction mechanical jars with special outer diameters or customized disc spring stack quantity & pre-compression load adjustment range require 20–35 working days production cycle, subject to total order quantity and customization scope.
Get Custom Datasheet & Factory Quote
We are a professional OEM & ODM manufacturer focused on full series coiled tubing heavy workover and washing downhole service tools, covering bi-direction hydraulic accelerators, bi-direction hydraulic jars, up-stroke hydraulic jars, bi-direction mechanical jars, up-stroke mechanical jars, thru tubing cutters, high expansion four-blade hydraulic anchors, annular grapple hydraulic anchors, heavy duty motorhead assemblies, concentric coiled tubing wash tools (multi-mode), concentric coiled tubing wash tools (single mode), slimline wash tools (double dart), slimline wash tools (double flapper), storm wash tools, low speed spinning jetting tools, multiple points rotary wash tools, fast rotary wash tools, conical wash tools, multi-nozzle wash tools, bull nose wash tools, big ID large bore motorhead assemblies, heavy duty integrated motorhead assemblies, big ID hydraulic disconnects, dog latch interchangeable piston hydraulic disconnects, heavy duty high torsion hydraulic retrievable disconnects, mechanical hydraulic dual-action disconnects, mechanical adjustable shear tension disconnects, dual activated dual-action circulation valves, ball activated shear pin circulation valves, burst disc pressure circulation valves, double dart dual-stage sealing check valves, double flapper dual-stage sealing check valves, big ID single flapper check valves, grapple dimple composite connectors, grub screw heavy-duty connectors, double dimple-on connectors, single dimple-on connectors, double roll-on connectors, single roll-on connectors, internal grapple connectors, external grapple connectors, logging heads and tubing hangers. Every finished product undergoes strict factory tensile load, repeated hydraulic spring compression fatigue, stroke travel calibration and synchronous energy release impact amplification performance testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, required stroke length, matched jar model, working environment and all customized specification demands. Our dedicated oilfield downhole tool engineering team will send complete detailed technical datasheets and competitive factory wholesale quotations within 24 business hours, and provide professional tandem assembly connection matching guidance for combination with matched jar tools.
