Product Overview
The Up-Stroke Mechanical Jar is a single-action single-way upward spring energy storage mechanical fishing jar, specially developed for coiled tubing downhole junk fishing heavy workover intervention operations. It adopts optimized compact mechanical structural layout, with prominent advantages including ultra-short closed make-up length, simplified internal mechanical mechanism, minimal performance impact from downhole well temperature, and convenient disassembly & routine maintenance.
This single upward stroke mechanical jar relies on stacked disc spring components as energy storage medium to realize controllable upward jarring impact only; no downward jarring stroke is available when slacking off tubing weight. The upward jarring release force can be precisely and stably adjusted to meet different downhole fishing load requirements: construction engineers tune the magnitude of upward impact output by changing the quantity of internal disc spring stacks and modifying the pre-compression preload of the spring assembly, achieving accurate and stable adjustable jarring force without replacing the entire jar body.
Different from hydraulic delay type upward jars, this mechanical jar eliminates hydraulic fluid delay medium; its spring mechanical energy storage 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 consistent upward impact energy output across variable well temperature working 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 Up-Stroke Mechanical Jar is optimized and dedicated for all types of downhole junk fishing heavy workover operations, and can be matched with fishing necks, hydraulic release 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 |
|---|---|---|---|---|---|---|
| L3151750120 | 1-3/4" | 0.39" | 25" | 4.5" | STD Standard | 1" AMMT |
| L3152125120 | 2-1/8" | 0.47" | 35" | 7" | STD Standard | 1-1/2" AMMT |
| L3152875120 | 2-7/8" | 0.87" | 40.5" | 7" | STD Standard | 2-3/8" PAC |
| L3153125120 | 3-1/8" | 1" | 43" | 10" | STD Standard | 2-3/8" PAC |
Note: Custom outer diameter, customized disc spring stack quantity configuration, spring pre-compression load adjustment range modification up-stroke mechanical jars are available via engineering consultation.
Core Features & Advantages
Short Compact Overall Length & Simplified Internal Mechanical Structure: Optimized compact mechanical layout greatly shortens the closed make-up length of the jar compared with hydraulic delay upward jars, 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 Upward Jarring Performance: Disc spring mechanical energy storage actuation principle removes dependency on hydraulic delay medium, upward jarring output performance will not be interfered by viscosity changes of hydraulic fluid under high/low downhole temperature, maintaining consistent controllable single upward impact energy across variable well temperature working conditions.
Precisely & Stably Adjustable Upward Jarring Release Force: The magnitude of single upward jarring impact force can be flexibly and accurately customized to adapt to different fishing load requirements; construction personnel can adjust the output upward 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, and the adjusted impact force is stable and free of fluctuation.
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 combined milling-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 single upward spring mechanical jar’s 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 single upward 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, single upward mechanical impact transmission matching components and torque bearing structure, featuring outstanding repeated upward impact fatigue resistance, high-torque load bearing capacity and structural stability, extending long-term continuous single upward jarring junk fishing service life.
Application Scenarios
1. Coiled tubing downhole junk fishing heavy-load intervention single upward jarring treatments including stuck metal junk release, dropped downhole tool recovery and stuck pipe release fishing construction operations
2. Conventional sweet crude oilfield single upward spring mechanical jar adjustable stable impact force junk fishing heavy workover service (STD standard service grade)
3. Downhole junk fishing heavy workover projects requiring temperature-insensitive stable single upward jarring impact, precisely adjustable spring release force and high torque through capability for milling-fishing combined construction
4. Long-term continuous repeated single upward 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 up-stroke mechanical jar integral pre-assembled unit including multi-stack disc spring energy storage assembly, single upward mechanical impact transmission structure and standard bottom connection thread
Spare interchangeable disc spring stack kit with multiple spring stiffness specifications for on-site upward jarring force adjustment configuration
Full factory inspection test report including repeated single upward impact fatigue resistance test, integral tensile load test, high-torque rotary bearing calibration test and disc spring upward release impact force precise 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 single upward jarring impact cycles, whichever condition is reached first
Full factory inspection: Each finished up-stroke mechanical jar passes integral tensile load test, repeated single upward impact cycle fatigue test, high-torque rotary bearing calibration test and disc spring upward release impact force precise 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 up-stroke mechanical jars based on customer technical drawings
FAQ
Q1: What is the core function of an Up-Stroke Mechanical Jar?
The Up-Stroke Mechanical Jar is a single-action single-way upward spring mechanical fishing jar for coiled tubing junk fishing workover. It features short compact closed length, simplified internal mechanical structure, little performance interference from downhole well temperature, and convenient disassembly maintenance. The upward jarring release force can be accurately and stably adjusted by modifying internal disc spring quantity and pre-compression preload, and it has high torque through bearing capability. It only generates controllable upward jarring impact when lifting the tubing string, without downward jarring stroke, and is specially designed for all types of downhole junk fishing recovery operations.
Q2: What three core structural advantages does this up-stroke mechanical jar own?
1. Short compact integral length with simplified internal mechanical layout, shorter closed make-up length than hydraulic delay upward jars, 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, upward jarring impact output will not be disturbed by hydraulic oil viscosity variation under high or low well temperature, maintaining stable consistent single upward jarring performance across variable well temperature working environments; 3. Precisely and stably adjustable upward jarring release force paired with high torque through bearing design: construction personnel can tune single upward impact magnitude accurately 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 up-stroke 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 up-stroke 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 up-stroke mechanical jars, bi-direction mechanical jars, bi-direction hydraulic jars, up-stroke hydraulic 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 single upward impact fatigue, high-torque rotary bearing and disc spring upward jarring force precise adjustment calibration testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, required disc spring stack configuration quantity & pre-compression load adjustment range, 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 on-site disassembly and spring upward jarring force adjustment operation guidance.
