Product Overview
The Grapple Dimple Connector is a composite external coiled tubing connection fitting that integrates the superior performance of slip grapple connectors and grub screw connectors, designed to deliver ultra-high tensile and torque load capacity for the most severe heavy-duty downhole intervention operations. This hybrid connector employs a dual locking mechanism: slip grapple segments on both sides provide the primary tensile load path through friction and mechanical interference, while grub screws in the center section provide additional torque resistance and anti-rotation locking. This dual-mechanism design delivers exceptional load-bearing capacity exceeding either individual connector type. The connector body integrates dual independent sealing elements to maintain stable high-pressure wellbore isolation under extreme downhole conditions. Two complete working grades are supplied to match different reservoir environments: STD standard grade for conventional sweet oil wells and H2S sour service grade manufactured with sulfur-resistant alloy for high-H2S corrosive downhole environments. The standardized product lineup covers coiled tubing sizes of 1.25", 1.5", 1.75", 2" and 2.375", with matched outer diameter, inner diameter and make-up length specifications, equipped with standard AMMT and PAC bottom connection threads for universal compatibility with mainstream downhole service tools. Custom tubing dimensions, wall thickness and anti-sulfur passivation coatings can be customized based on customer technical drawings.
Complete Technical Specification Table
| PN Part Number | CT Coiled Tubing Size | Outer Diameter OD | Overall Length | Locking Mechanism | Service Grade | Bottom Connection | Max Differential Pressure | Max Tensile Load |
|---|---|---|---|---|---|---|---|---|
| GDC-125-STD | 1.25" | 1.90" | 13.0" | Grapple + Grub Screw | STD | 1" AMMT | 10,000 PSI | 42,000 LBS |
| GDC-125-HS | 1.25" | 1.90" | 13.0" | Grapple + Grub Screw | H2S | 1" AMMT | 10,000 PSI | 42,000 LBS |
| GDC-150-STD | 1.50" | 2.15" | 13.5" | Grapple + Grub Screw | STD | 1-3/16" AMMT | 10,000 PSI | 52,000 LBS |
| GDC-150-HS | 1.50" | 2.15" | 13.5" | Grapple + Grub Screw | H2S | 1-3/16" AMMT | 10,000 PSI | 52,000 LBS |
| GDC-175-STD | 1.75" | 2.40" | 14.0" | Grapple + Grub Screw | STD | 1-3/16" AMMT | 10,000 PSI | 62,000 LBS |
| GDC-175-HS | 1.75" | 2.40" | 14.0" | Grapple + Grub Screw | H2S | 1-3/16" AMMT | 10,000 PSI | 62,000 LBS |
| GDC-200-STD | 2.00" | 2.65" | 14.5" | Grapple + Grub Screw | STD | 1-1/2" AMMT | 10,000 PSI | 82,000 LBS |
| GDC-200-HS | 2.00" | 2.65" | 14.5" | Grapple + Grub Screw | H2S | 1-1/2" AMMT | 10,000 PSI | 82,000 LBS |
| GDC-237-STD | 2.375" | 3.03" | 15.0" | Grapple + Grub Screw | STD | 1-1/2" AMMT | 10,000 PSI | 102,000 LBS |
| GDC-237-HS | 2.375" | 3.03" | 15.0" | Grapple + Grub Screw | H2S | 1-1/2" AMMT | 10,000 PSI | 102,000 LBS |
Core Features & Advantages
Composite grapple + grub screw dual locking mechanism, delivering ultra-high tensile strength and exceptional torque resistance exceeding single-type connector performance
The hybrid design combines the tensile load capacity of slip grapple segments with the torsional resistance of grub screws, providing load-bearing performance exceeding either individual connector type alone.
Slip grapple segments on both sides provide primary tensile load path through friction and mechanical interference with the coiled tubing outer wall
Grapple segments engage the CT surface across a large contact area, providing the primary axial load path for heavy pulling operations with distributed stress transfer.
Center-section grub screws provide additional torque resistance and anti-rotation locking for demanding drilling and milling operations
Grub screws in the center section prevent relative rotation between the connector and CT under high-torque drilling and milling loads, complementing the grapple tensile load capacity.
Dual independent sealing structure, providing stable leak-proof high-pressure sealing performance under fluctuating downhole temperature and pressure
Two independent seal stacks ensure reliable wellbore isolation under extreme downhole conditions with cyclic pressure and temperature loading.
Dual service grade design: STD standard version for conventional oil wells, H2S sulfur-resistant version for highly corrosive sour gas well working environments
STD grade for routine sweet wells; H2S grade with anti-sulfur material per NACE MR-0175 for sour gas downhole corrosive conditions.
Complete size series compatible with 1.25", 1.5", 1.75", 2", 2.375" standard coiled tubing, covering all mainstream coiled tubing service specifications
Full range from 1.25" through 2.375" covers all common CT diameters for standard downhole intervention operations.
Precision CNC machined high-strength alloy steel body, excellent wear, tensile and torsion resistance to extend continuous downhole service cycle
CNC-machined alloy steel construction provides exceptional service life in the most demanding downhole environments.
Customizable grapple specifications, grub screw configuration and anti-sulfur coatings to meet unique downhole load requirements
Custom grapple geometry, screw configurations, thread forms and anti-corrosion coatings are available based on customer technical drawings.
Application Scenarios
1. Heavy-load coiled tubing drilling, milling and fishing downhole intervention treatments
2. Conventional sweet crude oil well heavy workover and coiled tubing intervention service (STD standard service grade)
3. High-H2S sour gas well corrosive environment heavy-duty coiled tubing string connection operations (H2S sour service grade)
4. High-torque coiled tubing drilling, sidetracking and milling operations requiring superior anti-rotation locking
5. Sand washing, gas lifting and thru-tubing perforating auxiliary heavy-load coiled tubing extension construction
6. Long-term heavy pulling and torque transmission coiled tubing service in onshore and offshore oilfields
Standard Delivery Package
One complete grapple dimple connector main body with integrated grapple segments and grub screws
Matching 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, grapple segments and grub screw components are stocked with competitive factory bulk pricing.
Custom development service: Support custom grapple specifications, grub screw configurations and special size connectors based on customer technical drawings.
FAQ
Q1: What is a Grapple Dimple Connector?
A1: A Grapple Dimple Connector is a composite coiled tubing connector that integrates slip grapple segments and grub screws in a single body, providing both high tensile load capacity and superior torque resistance for heavy-duty downhole operations.
Q2: What coiled tubing sizes are available?
A2: Standard sizes cover CT diameters from 1.25" through 2.375". Custom sizes can be manufactured upon request.
Q3: What is the advantage of the hybrid grapple-grub screw design?
A3: The dual-mechanism design delivers load-bearing performance exceeding either individual connector type, with grapple segments handling primary tensile loads and grub screws providing anti-rotation torque resistance.
Q4: Is this connector suitable for high-torque drilling operations?
A4: Yes, the combination of grapple segments and grub screws provides exceptional torque resistance for demanding drilling, milling and sidetracking operations.
Q5: Can I customize the grapple segment design?
A5: Yes, custom grapple geometry, grub screw configurations, thread profiles and anti-corrosion coatings are available 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 grapple connectors, dimple connectors, grub screw connectors, composite connectors and all common BHA components. Please share your detailed technical requirements to our engineering team for professional technical proposal and factory direct price quotation.
