Product Overview
The External Grapple Connector is a heavy-duty mechanical connecting component designed exclusively for coiled tubing downhole assembly. It adopts an external grapple locking principle: the externally slotted grapple slips tightly grip the coiled tubing outer wall to form a high-strength mechanical locking structure, achieving full tensile and torque load transmission capacity matching the coiled tubing own yield strength. The connector integrates dual independently sealed V-packing high-pressure sealing elements to isolate wellbore internal and external pressure differential, ensuring leak-proof high-pressure performance under the most stringent downhole conditions.
This connector owns outstanding tensile strength and torque resistance to withstand heavy pulling and twisting loads during continuous oilfield operations. The product optimizes structural dimensions to minimize outer diameter and overall length, saving valuable downhole assembly space. Two complete service grades are available to fit different reservoir environments: STD standard grade for conventional sweet oil wells without sulfur-content corrosive risks; H₂S sulfur-resistant grade for sour gas well downhole high-corrosion workover conditions, with strict anti-sulfur surface coating treatment ensuring safe service life in high-sulfur environments.
Complete Technical Specification Table
| PN Part Number | CT Coiled Tubing Size | Outer Diameter OD | Overall Length | Service Grade | Bottom Connection | Max Differential Pressure | Max Tensile Load |
|---|---|---|---|---|---|---|---|
| EGC-125-STD | 1.25" | 1.75" | 12.5" | STD | 1" AMMT | 10,000 PSI | 40,000 LBS |
| EGC-125-HS | 1.25" | 1.75" | 12.5" | H₂S | 1" AMMT | 10,000 PSI | 40,000 LBS |
| EGC-150-STD | 1.50" | 2.00" | 13.0" | STD | 1-3/16" AMMT | 10,000 PSI | 50,000 LBS |
| EGC-150-HS | 1.50" | 2.00" | 13.0" | H₂S | 1-3/16" AMMT | 10,000 PSI | 50,000 LBS |
| EGC-175-STD | 1.75" | 2.25" | 13.5" | STD | 1-3/16" AMMT | 10,000 PSI | 60,000 LBS |
| EGC-175-HS | 1.75" | 2.25" | 13.5" | H₂S | 1-3/16" AMMT | 10,000 PSI | 60,000 LBS |
| EGC-200-STD | 2.00" | 2.50" | 14.0" | STD | 1-1/2" AMMT | 10,000 PSI | 80,000 LBS |
| EGC-200-HS | 2.00" | 2.50" | 14.0" | H₂S | 1-1/2" AMMT | 10,000 PSI | 80,000 LBS |
| EGC-237-STD | 2.375" | 2.875" | 14.5" | STD | 1-1/2" AMMT | 10,000 PSI | 100,000 LBS |
| EGC-237-HS | 2.375" | 2.875" | 14.5" | H₂S | 1-1/2" AMMT | 10,000 PSI | 100,000 LBS |
Core Features & Advantages
High tensile external grapple locking structure, excellent torque bearing capacity to resist heavy dynamic downhole loads
Superior mechanical locking between grapple slips and coiled tubing outer wall transfers full tensile and torsional loads without slippage, matching or exceeding the coiled tubing yield strength during heavy pulling and rotating operations.
Dual independent sealing design, stable leak-proof high-pressure sealing performance to avoid medium leakage under complex well conditions
Two independent V-packing sealing assemblies guarantee reliable wellbore isolation under differential pressures up to 15,000 PSI, maintaining sealing integrity even under cyclic pressure and temperature loading.
Dual working grade design: STD standard version for conventional oil wells, H₂S sulfur-resistant version for corrosive sour gas well service
Standard grade covers routine sweet well operations while the H₂S grade with anti-sulfur surface passivation treatment meets NACE MR-0175 sour service requirements for extended service life in high-sulfur downhole environments.
Complete size series compatible with 1.25", 1.5", 1.75", 2", 2.375" standard coiled tubing
Full range of connector sizes covers the most commonly used coiled tubing diameters, providing off-the-shelf availability for standard CT intervention operations.
Standard AMMT and PAC bottom connection threads, universal matching with global mainstream coiled tubing downhole tools
Industry-standard AMMT and PAC thread profiles ensure direct compatibility with downhole tools from major global manufacturers without adapter subs.
Compact make-up length, saves assembly space for coiled tubing string on wellsite injector head assemblies
Optimized overall length reduces the space required between the injector head and BOP stack, facilitating rig-up on space-constrained wellsite locations.
Precision CNC machined high-strength alloy steel body, great abrasion and corrosion resistance to extend service cycle
CNC-machined alloy steel construction with optional surface hardening and anti-corrosion coatings provides extended service life in abrasive and corrosive wellbore environments.
Customizable bottom thread profiles and anti-sulfur surface passivation coatings to meet unique downhole tool connection requirements
Custom thread forms and specialized anti-corrosion surface treatments are available to match proprietary BHA tool connections and unique well fluid chemistry requirements.
Application Scenarios
1. Coiled tubing matrix acidizing and hydraulic fracturing reservoir stimulation operations
2. Gas lift well production supporting coiled tubing string assembly and downhole anchoring
3. Sand washing, wellbore cleanup, plug milling and scale removal downhole treatment
4. Conventional sweet crude oil well coiled tubing intervention (STD standard service grade)
5. High-H₂S sour gas well corrosive downhole workover operations (H₂S sour service grade)
6. Mechanical connection fitting for all coiled tubing bottom-hole assembly tools
Standard Delivery Package
Complete external grapple connector main body with integrated grapple locking structure
Matching dual sealing assembly spare parts kit for field maintenance
Full factory inspection test report including tensile load, torque and high-pressure sealing test data
Product dimension drawing and official installation & operation 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 connector passes tensile load, torque resistance and high-pressure sealing performance testing before delivery.
Free professional technical support: Our oilfield downhole tool engineering team provides installation guidance, parameter matching and operation consultation.
Long-term spare parts supply: All sealing wear parts and grapple accessories are stocked with competitive factory bulk pricing.
Custom development service: Support custom bottom thread profiles, anti-corrosion coatings and special size connectors based on customer technical drawings.
FAQ
Q1: What is the core difference between STD standard grade and H₂S sour service grade?
A1: STD standard grade is manufactured for conventional sweet oil well environments without corrosive sulfur compounds. The H₂S sour service grade uses anti-sulfur surface passivation coating treatment and material selection per NACE MR-0175, suitable for high-H₂S content downhole corrosive workover conditions.
Q2: Can I customize special bottom connection thread specifications to match my proprietary downhole tools?
A2: Custom thread profiles and special connection specifications are fully supported. Please provide detailed thread drawings and dimensional requirements to our engineering team for evaluation and manufacturing.
Q3: What range of coiled tubing sizes do these grapple connectors support?
A3: Our standard production lineup fully covers 1.25", 1.5", 1.75", 2" and 2.375" coiled tubing sizes. Non-standard sizes beyond this range can be custom manufactured upon request.
Q4: Is this external grapple connector suitable for high-pressure acid fracturing operations?
A4: Yes. The heavy-duty external grapple locking structure and dual independent high-pressure sealing design can withstand the extreme downhole pressure, temperature and corrosive acid fluid environment typical of acid fracturing and matrix acidizing stimulation operations.
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 dispatched within 7 to 15 working days after order confirmation. Custom specification connectors typically require 25 to 40 working days depending on quantity and complexity.
Get Custom Datasheet & Factory Quote
We are a professional OEM & ODM manufacturer focused on full series coiled tubing downhole service tools, covering external grapple connectors, internal grapple connectors, hydraulic jars, circulation valves, check valves, centralizers and all common BHA components. Please share your detailed technical requirements, including target coiled tubing size, working environment (STD standard or H₂S sour service) and required bottom connection thread specifications to our engineering team for professional technical proposal and factory direct price quotation.
