Product Overview
The Internal Grapple Connector is a precision-engineered coiled tubing downhole assembly component that establishes a high-strength mechanical connection through an internal grapple mechanism. Unlike external grapple designs, this connector uses an internally cut grapple (slip) assembly that expands outward to grip the coiled tubing inner diameter, creating a secure mechanical lock that transfers full tensile and torsional loads through the CT-to-grapple contact interface. Dual independent V-packing seal stacks positioned above and below the grapple element provide reliable wellbore pressure isolation. This design offers a streamlined outer profile with no external protrusions, making it particularly suitable for restricted-clearance wellbore applications and operations requiring maximum through-bore access.
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 |
| IGC-125-STD |
1.25" |
1.85" |
11.5" |
STD |
1" AMMT |
10,000 PSI |
38,000 LBS |
| IGC-125-HS |
1.25" |
1.85" |
11.5" |
H₂S |
1" AMMT |
10,000 PSI |
38,000 LBS |
| IGC-150-STD |
1.50" |
2.10" |
12.0" |
STD |
1-3/16" AMMT |
10,000 PSI |
48,000 LBS |
| IGC-150-HS |
1.50" |
2.10" |
12.0" |
H₂S |
1-3/16" AMMT |
10,000 PSI |
48,000 LBS |
| IGC-175-STD |
1.75" |
2.35" |
12.5" |
STD |
1-3/16" AMMT |
10,000 PSI |
58,000 LBS |
| IGC-175-HS |
1.75" |
2.35" |
12.5" |
H₂S |
1-3/16" AMMT |
10,000 PSI |
58,000 LBS |
| IGC-200-STD |
2.00" |
2.60" |
13.0" |
STD |
1-1/2" AMMT |
10,000 PSI |
75,000 LBS |
| IGC-200-HS |
2.00" |
2.60" |
13.0" |
H₂S |
1-1/2" AMMT |
10,000 PSI |
75,000 LBS |
| IGC-237-STD |
2.375" |
2.98" |
13.5" |
STD |
1-1/2" AMMT |
10,000 PSI |
95,000 LBS |
| IGC-237-HS |
2.375" |
2.98" |
13.5" |
H₂S |
1-1/2" AMMT |
10,000 PSI |
95,000 LBS |
Core Features & Advantages
High tensile internal grapple locking structure, excellent torque bearing capacity to resist heavy dynamic downhole loads
The internal grapple slips expand to grip the CT inner wall, providing strong mechanical locking that transfers full tensile and torque loads 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 seal assemblies ensure reliable wellbore isolation under differential pressure, maintaining seal integrity 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
STD grade for routine sweet oil wells; H₂S grade with anti-sulfur surface treatment meets NACE MR-0175 requirements for high-sulfur downhole environments.
Complete size series compatible with 1.25", 1.5", 1.75", 2", 2.375" standard coiled tubing
Full size range covers all commonly used CT diameters for standard intervention operations.
Standard AMMT and PAC bottom connection threads, universal matching with global mainstream coiled tubing downhole tools
Industry-standard AMMT and PAC threads ensure direct compatibility with downhole tools from major global manufacturers without adapter subs.
Smooth external profile, no protruding structures, enables operation in restricted-clearance wellbores and simplifies BHA rig-up
The internal grapple eliminates external protrusions, allowing passage through wellbore restrictions while simplifying BHA assembly at surface.
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 provides long service life in abrasive and corrosive downhole environments.
Customizable bottom thread profiles and anti-sulfur surface passivation coatings to meet unique downhole tool connection requirements
Custom thread profiles and specialized anti-corrosion coatings are available for proprietary BHA connections and unique well fluid chemistry.
Application Scenarios
1. Coiled tubing sand washing operations
2. Gas lifting well downhole connection assemblies
3. Well workover and remedial downhole treatments
4. Conventional oil well coiled tubing intervention
5. High-sulfur gas well downhole operations using H₂S grade
6. Downhole tool connection for coiled tubing service strings
Standard Delivery Package
One complete internal 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 an Internal Grapple Connector?
A1: An Internal Grapple Connector is a downhole fitting that connects to coiled tubing through slips, providing mechanical connection, torque resistance and high-pressure sealing for well intervention operations.
Q2: What sizes are available?
A2: Standard sizes cover coiled tubing sizes 1.25", 1.5", 1.75" and 2", with different OD, ID and length specifications.
Q3: What is the difference between STD and H₂S versions?
A3: STD is designed for conventional oil wells, while H₂S sour service version is suitable for high-sulfur gas well environments requiring corrosion-resistant materials and anti-sulfur coating per NACE MR-0175.
Q4: What operations is this connector suitable for?
A4: It is commonly used for sand washing, gas lifting, workover and other coiled tubing downhole service operations.
Q5: Can I request custom specifications?
A5: Yes, custom sizes, thread profiles, anti-sulfur coatings and special connection requirements can be quoted based on your technical drawings.
Get Custom Datasheet & Factory Quote
We are a professional OEM & ODM manufacturer focused on full series coiled tubing downhole service tools, covering internal grapple connectors, external 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.
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