Product Overview
The Mechanical Disconnect is a two-piece split coiled tubing emergency release tool, composed of an upper sub and a lower sub connected by brass shear screws. When emergency separation of the coiled tubing work string is required on site, operators apply upward pulling tension to exceed the preset shear load of the brass shear screws, the screws shear off completely to separate the upper and lower assemblies, realizing safe mechanical release of the downhole tool string.
This mechanical disconnect is specially developed for medium and heavy-duty coiled tubing downhole intervention operations, including sand washing, well cleaning, gas lifting and other conventional oilfield construction processes. It integrates three core optimized designs: adjustable shear breaking tension, built-in standard GS internal fish neck, and full torque-through structural design. Two complete service grades are supplied to match diverse reservoir environments: STD standard grade for conventional sweet oil wells without hydrogen sulfide corrosive media, and H₂S sour service grade manufactured with sulfur-resistant alloy for high-H₂S corrosive sour gas well working conditions.
The standardized product lineup covers outer diameter sizes ranging from 1-11/16" to 3-1/8", with matched inner diameter, make-up length and GS fish neck size specifications, equipped with standard AMMT and PAC bottom connection threads for universal compatibility with mainstream coiled tubing connectors and downhole service tools. Custom shear breaking tension load, custom fish neck size, wall thickness and anti-sulfur passivation coatings are available upon customer technical drawing submission.
Complete Technical Specification Table
| PN Part Number | Outer Diameter OD | Inner Diameter ID | Make-Up Length | Internal GS Fish Neck Size | Working Condition Grade | Bottom Connection Thread |
|---|---|---|---|---|---|---|
| L1191690120 | 1-11/16" | 0.75" | 9.2" | 2" | STD Standard | 1" AMMT |
| L1192125120 | 2-1/8" | 0.75" | 9.7" | 2" | STD Standard | 1-1/2" AMMT |
| L1192875120 | 2-7/8" | 1.37" | 10" | 3" | STD Standard | 2-3/8" PAC |
| L1193125120 | 3-1/8" | 1.37" | 10" | 3-1/2" | STD Standard | 2-3/8" PAC |
| L1191690320 | 1-11/16" | 0.75" | 9.2" | 2" | H₂S Sour Service | 1" AMMT |
| L1192125320 | 2-1/8" | 0.75" | 9.7" | 2" | H₂S Sour Service | 1-1/2" AMMT |
| L1192875320 | 2-7/8" | 1.37" | 10" | 3" | H₂S Sour Service | 2-3/8" PAC |
| L1193125320 | 3-1/8" | 1.37" | 10" | 3-1/2" | H₂S Sour Service | 2-3/8" PAC |
Note: Custom shear breaking tension load, custom GS fish neck size, outer diameter, inner bore flow size, anti-sulfur passivation coatings and non-standard length mechanical disconnects are available via engineering consultation.
Core Features & Advantages
Adjustable shear breaking tension design: adopt replaceable brass shear screws of different specifications, freely adjust the preset pull-off load according to customer construction safety requirements to realize controllable emergency release
Built-in standard GS internal fish neck structure, after mechanical separation, the lower disconnected assembly can be easily fished and recovered by matching fishing tools, effectively reducing downhole tool loss risk:
Full torque-through structural design, the upper and lower sub connection structure can transmit torsion torque during coiled tubing rotating intervention construction, compatible with cutting, milling and other torque-demanding operations:
Dual service grade design: STD standard version for conventional sweet oilfield working conditions, H₂S sulfur-resistant alloy version for highly corrosive high-H₂S sour gas well service
Complete outer diameter series compatible with 1-11/16", 2-1/8", 2-7/8" and 3-1/8" coiled tubing matching assemblies, covering all mainstream small and medium-size coiled tubing heavy-load downhole service demands:
Two-piece split compact integrated structure, simple external threaded connection design, convenient for fast disassembly and assembly into coiled tubing bottom tool string on site:
Precision CNC machined high-strength alloy steel valve body, excellent tensile, torsion and fatigue resistance to extend continuous long-term downhole service cycle:
Multi-dimensional customizable technical parameters, including shear breaking tension load, GS fish neck inner size, outer diameter, bottom thread specification and anti-sulfur surface passivation coatings, to satisfy unique proprietary coiled tubing emergency release requirements:
Application Scenarios
1. Coiled tubing sand washing, well cleaning, gas lifting and other medium & heavy-duty downhole intervention treatments requiring emergency tool string release
2. Conventional sweet crude oil well coiled tubing emergency release safety protection service (STD standard service grade)
3. High-H₂S sour gas well corrosive environment coiled tubing tool string emergency mechanical separation operations (H₂S sour service grade)
4. Downhole tool stuck, tubing string jamming emergency release construction, matched with fishing tools for fallen assembly recovery
5. Long-term emergency separation safety protection for coiled tubing strings in onshore and offshore oilfields
Standard Delivery Package
Complete mechanical disconnect two-piece assembly (upper sub + lower sub) with built-in replaceable brass shear screws
Spare brass shear screw kit with multiple shear tension specifications for field load adjustment
Full factory inspection test report including shear breaking tension calibration, torque transmission and tensile resistance test data
Product dimension drawing and official shear screw replacement, installation & operation instruction manual
Quality Warranty & After-Sales Service
Warranty Coverage: 12 months after factory shipment or 2000 cumulative working hours, whichever condition is reached first
Full factory inspection: Each finished mechanical disconnect passes shear breaking tension calibration, torque transmission and tensile resistance performance testing before delivery
Free professional technical support: Our oilfield downhole tool engineering team provides tool string matching, shear screw tension selection guidance and parameter consultation free of charge
Long-term spare parts supply: All brass shear screw consumable accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom shear breaking tension loads, custom GS fish neck sizes, bottom thread profiles, anti-corrosion coatings and special size mechanical disconnects based on customer technical drawings
FAQ
Q1: What is the core function of a Mechanical Disconnect??
The Mechanical Disconnect is a two-piece emergency release tool connected by brass shear screws. When the downhole coiled tubing tool string gets stuck, apply upward tension exceeding the preset shear load to cut off shear screws, separate upper and lower subs to release the stuck downhole assembly. Q2: What three unique structural advantages does this mechanical disconnect have? A2: 1. Adjustable shear breaking tension via interchangeable brass shear screws; 2. Built-in standard GS fish neck for convenient recovery of separated lower tools; 3. Torque through capability to transmit torsion for rotating downhole operations. Q3: What range of outer diameter sizes do these mechanical disconnects support? A3: Our standard production lineup fully covers 1-11/16", 2-1/8", 2-7/8" and 3-1/8" outer diameter specifications, compatible with global mainstream small and medium-size coiled tubing matching assemblies. Q4: What is the difference between STD standard grade and H₂S sour service grade? A4: STD standard grade is manufactured for conventional sweet oil wells without hydrogen sulfide corrosive fluid. H₂S sour service grade adopts sulfur-resistant alloy substrate and special anti-sulfur passivation coating to resist chemical corrosion in high-H₂S sour gas well environments. Q5: What is the standard production lead time for bulk purchase orders? A5: All standard PN part numbers are kept in factory inventory, goods can be delivered within 7–15 working days. Customized mechanical disconnects with special shear tension loads or custom fish neck dimensions require 20–35 working days production cycle, subject to total order quantity.
Get Custom Datasheet & Factory Quote
We are a professional OEM & ODM manufacturer focused on full series coiled tubing downhole service tools, covering mechanical adjustable shear tension disconnect release subs, 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 shear tension calibration, torque transmission and tensile resistance testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, required shear breaking tension load, GS fish neck custom size, working environment (STD standard or H₂S sour service) and 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.
