Product Overview
The Heavy Duty Motorhead Assembly is an all-in-one integrated coiled tubing heavy workover downhole assembly, integrated with three core functional components into a single compact unit: Double Flapper Check Valve, Heavy Duty Hydraulic Disconnect and Dual Activated Circulation Valve.
Compared with separately matched individual standard double flapper check valve, heavy-duty hydraulic disconnect and dual-actuated circulation valve combinations, this integrated motorhead assembly adopts optimized compact structural layout to greatly reduce the overall make-up length, which can effectively shorten the total length of downhole coiled tubing tool strings, reduce tubing drag resistance during tripping, and improve the passing performance through wellbore restrictions and shoulders.
This product is specially developed for high-load heavy-duty coiled tubing downhole intervention operations, including casing cutting, hard formation milling, junk fishing and other heavy workover construction scenarios. The built-in high-torque resistant main body structure can bear large rotary torque output from downhole motors during milling and cutting; the hydraulic disconnect module supports variable shear screw quantity configuration, enabling flexible adjustment of release shear load according to different downhole construction load requirements. The double flapper check valve provides reliable one-way anti-backflow sealing protection, while the dual-activated circulation valve realizes bidirectional fluid circulation switching to meet flushing, pressure setting and circulation control demands during heavy workover operations.
Two complete service grades are supplied to adapt diverse reservoir environments: STD standard grade for conventional sweet oil wells without hydrogen sulfide corrosive media; H₂S sour service grade manufactured with sulfur-resistant alloy to adapt high-H₂S corrosive sour gas well downhole working conditions.
The standardized product lineup covers outer diameter sizes ranging from 1-3/4" to 3-1/8", with matched ball size, fish neck and overall make-up length 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 and heavy workover downhole service tools. Custom outer diameter, shear screw configuration quantity 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 | Ball Size | Fish Neck | Make-Up Length | Working Condition Grade | Bottom Connection Thread |
|---|---|---|---|---|---|---|---|
| L1251750120 | 1-3/4" | 0.393" | 5/8" | 2" | 28.9" | STD Standard | 1" AMMT |
| L1252125120 | 2-1/8" | 0.551" | 3/4" | 2" | 31.5" | STD Standard | 1-1/2" AMMT |
| L1252875120 | 2-7/8" | 0.787" | 1" | 3" | 40.4" | STD Standard | 2-3/8" PAC |
| L1253125120 | 3-1/8" | 0.875" | 1-1/8" | 3" | 42.4" | STD Standard | 2-3/8" PAC |
| L1251750320 | 1-3/4" | 0.393" | 5/8" | 2" | 28.9" | H₂S Sour Service | 1" AMMT |
| L1252125320 | 2-1/8" | 0.551" | 3/4" | 2" | 31.5" | H₂S Sour Service | 1-1/2" AMMT |
| L1252875320 | 2-7/8" | 0.787" | 1" | 3" | 40.4" | H₂S Sour Service | 2-3/8" PAC |
| L1253125320 | 3-1/8" | 0.875" | 1-1/8" | 3" | 42.4" | H₂S Sour Service | 2-3/8" PAC |
Note: Custom outer diameter, variable shear screw quantity configuration, anti-sulfur passivation coatings and non-standard length heavy duty motorhead assemblies are available via engineering consultation.
Core Features & Advantages
All-In-One Triple-Function Integrated Compact Structural Design: Integrates double flapper one-way check valve, heavy-duty hydraulic release disconnect and dual-activated bidirectional circulation valve into a single integral assembly, eliminating the need for separate connection of three individual components, drastically shortening overall make-up length and simplifying coiled tubing heavy workover tool string layout.
High-Torque Resistant Main Body Structural Design: Optimized thickened high-strength alloy main body and torque transmission matching structure, capable of stably bearing large rotary torque output from downhole power motors during casing cutting, hard rock milling and junk fishing operations, avoiding structural deformation or failure under high torque load.
Ultra-Short Make-Up Length Advantage: The integrated compact layout reduces the total length compared with discrete component combinations, shortening the overall length of the coiled tubing tool string, lowering tubing friction drag during running in and pulling out, and improving the passing performance through wellbore nipples, shoulders and internal restrictions.
Customizable Variable Shear Screw Quantity Configuration: The hydraulic disconnect module supports flexible adjustment of shear screw count, enabling construction engineers to customize the release shear load threshold according to specific downhole fishing, cutting and milling load requirements, realizing controllable emergency release of the downhole tool string when stuck.
Dual Working Condition Grade Configuration: STD standard version applies to conventional sweet oilfield non-corrosive working environments; H₂S sour service version adopts sulfur-resistant alloy base material and professional anti-sulfur passivation coating to resist hydrogen sulfide corrosion in harsh sour gas well heavy workover conditions.
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 heavy-load cutting, milling and fishing intervention demands.
Standard AMMT & PAC 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 without extra conversion subs.
Precision CNC High-Strength Alloy Manufacturing: Adopts precision CNC machining integral tool body, double flapper valve cartridge, hydraulic disconnect shear screw assembly and dual-action circulation valve components, featuring outstanding high-torque load resistance, high-pressure fluid erosion resistance and structural stability, extending long-term continuous heavy-load downhole cutting and fishing service life.
Application Scenarios
1. Coiled tubing heavy-load downhole intervention treatments including casing cutting, hard formation milling, junk fishing, plug milling and scale breakdown operations
2. Conventional sweet crude oil well integrated compact high-torque motor head heavy workover service (STD standard service grade)
3. High-H₂S sour gas well corrosive environment coiled tubing cutting, milling and fishing heavy-load downhole construction operations (H₂S sour service grade)
4. Downhole heavy workover projects requiring integrated check valve, hydraulic emergency release disconnect and bidirectional circulation valve in one compact short-length assembly
5. Long-term continuous high-torque heavy-load cutting, milling and fishing safety protection for coiled tubing bottom-hole assemblies in onshore and offshore oilfield heavy workover intervention projects
Standard Delivery Package
Complete heavy duty motorhead assembly integral pre-assembled unit including double flapper check valve cartridge, heavy-duty hydraulic disconnect with adjustable shear screw assembly and dual activated circulation valve
Spare interchangeable shear screw kit with multiple quantity specifications for on-site release shear load adjustment
Full factory inspection test report including high-torque load resistance test, integral tensile load test, double flapper one-way sealing performance test and hydraulic disconnect shear release calibration test data
Product dimension drawing and official 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 heavy duty motorhead assembly passes integral tensile load test, high-torque bearing calibration test, double flapper sealing test and hydraulic disconnect shear release test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing heavy workover tool string matching, outer diameter & shear screw quantity selection and working condition grade consultation free of charge
Long-term spare parts supply: All interchangeable shear screw wear accessories and flapper valve cartridges are stocked with competitive factory bulk pricing
Custom development service: Support custom outer diameters, variable shear screw configuration counts, bottom thread profiles, anti-corrosion coatings and special size heavy duty motorhead assemblies based on customer technical drawings
FAQ
Q1: What is the core function of a Heavy Duty Motorhead Assembly??
The Heavy Duty Motorhead Assembly is an all-in-one compact coiled tubing heavy workover sub integrating three core modules: double flapper check valve, heavy-duty hydraulic disconnect and dual-actuated circulation valve. It features high torque resistant construction and customizable shear screw count, ultra-short integrated length to simplify tool strings. Designed for heavy-load downhole operations including casing cutting, hard formation milling and junk fishing, it provides anti-backflow sealing, controllable emergency hydraulic release and bidirectional fluid circulation switching in a single assembly.
Q2: What three core structural advantages does this heavy duty motorhead assembly own??
1. Triple-function integrated compact design, combining check valve, hydraulic disconnect and dual-action circulation valve into one unit, overall length far shorter than separate individual component combinations to streamline heavy workover coiled tubing tool string layout; 2. High torque resistant main body structural design, capable of bearing large rotary torque from downhole motors during cutting and milling heavy-load construction, avoiding torque-induced structural damage; 3. Variable customizable shear screw quantity configuration, allowing flexible adjustment of hydraulic release shear load threshold to match different downhole fishing and cutting load requirements, realizing controllable emergency tool string release when stuck downhole.
Q3: What outer diameter sizes do these heavy duty motorhead assemblies 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.
Q4: What is the difference between STD standard grade and H₂S sour service grade??
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??
All standard PN part numbers are kept in factory inventory, goods can be delivered within 7–15 working days. Customized heavy duty motorhead assemblies with special outer diameters or custom shear screw quantity configurations 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 heavy workover and washing downhole service tools, covering heavy duty motorhead assemblies, 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, high-torque bearing, double flapper sealing and hydraulic disconnect shear release calibration testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, required shear screw quantity configuration, working environment (STD standard or H₂S sour service) 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.
