Product Overview
The Big ID Motorhead Assembly is a compact 3-in-1 integrated downhole tool designed exclusively for light & medium-load coiled tubing downhole operations. This assembly integrates three core large-bore functional components into one single unit: Big ID flapper one-way check valve, Big ID hydraulic disconnect and burst disc circulation valve, replacing three separate individual downhole tools to simplify field deployment and shorten overall tool string length.
Compared with the traditional split layout of independent big ID check valve, hydraulic disconnect and burst disc circulation valve, this integrated motorhead adopts an optimized compact structural design, which greatly shortens the total make-up length of the downhole coiled tubing tool string and effectively reduces tubing running and pulling drag resistance. The product features a large unobstructed inner through bore, increasing the internal flow area by approximately 40% to support high-efficiency downhole fluid circulation.
Equipped with a built-in standard GS internal fish neck structure, this motorhead can be matched with conventional GS fishing tools to salvage and recover the lower separated downhole tool assembly after hydraulic release. It is specially developed for light and medium-load non-heavy rotary coiled tubing operations, including sand washing, wellbore cleanout and gas lifting.
Two complete service grades are available 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 large inner through bore size, make-up length and GS fish neck specifications, equipped with standard AMMT and PAC bottom connection threads for universal compatibility with mainstream coiled tubing connectors and light-medium load downhole service tools. Custom inner bore flow dimensions, GS fish neck inner sizes, 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 |
|---|---|---|---|---|---|---|
| L1311750120 | 1-3/4" | 0.6" | 28.9" | 2" | STD Standard | 1" AMMT |
| L1312125120 | 2-1/8" | 0.8" | 34.3" | 2" | STD Standard | 1-1/2" AMMT |
| L1312875120 | 2-7/8" | 1.1" | 40.4" | 3" | STD Standard | 2-3/8" PAC |
| L1313125120 | 3-1/8" | 1.1" | 42.4" | 3" | STD Standard | 2-3/8" PAC |
| L1311750320 | 1-3/4" | 0.6" | 28.9" | 2" | H₂S Sour Service | 1" AMMT |
| L1312125320 | 2-1/8" | 1" | 34.3" | 2" | H₂S Sour Service | 1-1/2" AMMT |
| L1312875320 | 2-7/8" | 1.1" | 40.4" | 3" | H₂S Sour Service | 2-3/8" PAC |
| L1313125320 | 3-1/8" | 1.1" | 42.4" | 3" | H₂S Sour Service | 2-3/8" PAC |
Note: Custom inner through bore flow dimension, GS fish neck inner size, outer diameter, anti-sulfur passivation coatings and non-standard length big ID motorhead assemblies are available via engineering consultation.
Core Features & Advantages
Large Unobstructed Through Bore Design: The integrated big bore structural layout expands internal flow area by roughly 40%, realizing high-efficiency downhole fluid circulation, reducing flow resistance and improving well treatment construction efficiency.
Compact Shortened Overall Make-Up Length: The integrated one-piece structure eliminates redundant intermediate connecting threads between three separate tools, drastically cutting total assembly length and minimizing downhole tubing drag during tripping operations.
Built-in Standard GS Internal Fish Neck Structure: The upper sub reserves a standard GS fishing profile, which can be rapidly matched with general GS fishing tools to salvage lost lower downhole tool assemblies, lowering post-operation fishing construction difficulty.
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 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 light & medium-load downhole intervention demands.
Simple External Thread Connection Structure: Straightforward upper and lower external thread design enables fast on-site installation and disassembly, significantly improving coiled tubing tool string assembly efficiency and cutting field operation time.
Precision CNC High-Strength Alloy Manufacturing: Adopts precision CNC machining integral tool body, featuring outstanding erosion resistance, pressure fatigue resistance and structural stability, extending long-term light-medium load downhole safety service life.
Multi-dimensional Customizable Technical Parameters: Supports customized inner through bore flow size, GS fish neck inner dimension, outer diameter, bottom thread specification and anti-corrosion surface passivation coatings to satisfy personalized light-medium load coiled tubing downhole operation requirements.
Application Scenarios
1. Light & medium-load coiled tubing sand washing, wellbore cleanout, gas lifting and other low-tension non-heavy rotary downhole intervention treatments requiring integrated large-bore motorhead tool string
2. Conventional sweet crude oil well light-medium load coiled tubing circulation control and emergency release protection service (STD standard service grade)
3. High-H₂S sour gas well corrosive environment light-medium load coiled tubing integrated big bore motorhead downhole construction operations (H₂S sour service grade)
4. Non-heavy rotary downhole construction projects that require compact integrated motorhead to shorten total tool string length, expand internal flow area and reduce tubing drag resistance
5. Long-term light & medium-load tension safety protection for integrated coiled tubing big bore motorhead tool strings in onshore and offshore oilfield gas lifting and well cleanup operations
Standard Delivery Package
Complete big ID integrated motorhead assembly main body pre-assembled with built-in big ID flapper check valve, big ID hydraulic disconnect and burst disc circulation valve internal components
Matching spare sealing component kit for on-site circulation valve and check valve maintenance
Full factory inspection test report including integral tensile load test, high-pressure sealing performance test and fluid circulation flow 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 big ID motorhead assembly passes integral tensile load test, high-pressure sealing test and fluid circulation calibration test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides tool string matching, inner bore flow parameter and working condition grade selection consultation free of charge
Long-term spare parts supply: All sealing wear parts and circulation valve accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom inner through bore flow sizes, GS fish neck inner dimensions, bottom thread profiles, anti-corrosion coatings and special size big ID motorhead assemblies based on customer technical drawings
FAQ
Q1: What is the core function of a Big ID Motorhead Assembly?
The Big ID Motorhead Assembly is a 3-in-1 integrated large-bore coiled tubing downhole tool combining big ID flapper check valve, big ID hydraulic disconnect and burst disc circulation valve. It features a 40% larger inner through bore for high fluid circulation efficiency, shortens overall downhole tool string length, and comes with built-in GS fish neck for salvage operations, designed for light-medium load sand washing, well cleanout and gas lifting work.
Q2: What three core structural advantages does this big ID motorhead assembly own?
1. Large unobstructed through bore design, expanding internal flow area by about 40% to boost downhole fluid circulation efficiency; 2. Compact integrated layout shortens total assembly length compared with three separate individual tools, reducing tubing drag resistance during tripping; 3. Built-in standard GS internal fish neck, compatible with conventional GS fishing tools for recovering stuck lower tool assemblies.
Q3: What outer diameter sizes do these big ID 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 sizes match global mainstream medium-size 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 big ID motorhead assemblies with special inner bore sizes or custom coatings 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 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-pressure sealing and fluid circulation calibration testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, custom inner through bore flow dimension, GS fish neck custom inner dimension, 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.
