Product Overview
The Hydraulic Anchor (Grapple) is a hydraulic actuated downhole positioning anchor tool specially developed for coiled tubing heavy workover intervention operations. It can provide a stable positive fixed anchor point at any arbitrary depth/position within the tubing or casing wellbore, cooperating with other downhole functional tools to realize torque-bearing positioning for cutting, milling, plug grinding and junk fishing heavy-load operations.
The anchor is actuated by circulating hydraulic fluid from surface pump. When pump flow rate reaches setting threshold, internal hydraulic piston drives the annular grapple slips to expand outward and fully engage against the inner wall of tubing/casing, realizing mechanical anchoring locking. The tool features a self-locking structural design: after the grapple slips fully bite the pipe wall, no additional tensile load or continuous hydraulic pressure is required to maintain stable anchoring status, which effectively avoids tool slipping or retraction during high-torque rotary downhole construction.
After finishing all downhole work procedures, the unset operation is simple and convenient: reduce surface pump circulation flow rate to release hydraulic actuating pressure, then apply slight upward lifting weight on coiled tubing string; the slack upward tension is enough to retract the grapple slips and fully close the hydraulic anchor, so the entire tool string can be tripped out of the well smoothly. The tool body adopts high-strength thickened alloy structure with excellent torque through capability, capable of bearing large rotary torque output from downhole motors during milling and cutting 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 3-1/2", with matched maximum anchor extension range, overall make-up length specifications, equipped with standard 1" AMMT, 1-1/2" AMMT, 2-3/8" PAC and NC26 bottom connection threads for universal compatibility with mainstream coiled tubing connectors and heavy workover downhole service tools. Custom outer diameter, maximum grapple extension range 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 | Maximum Anchor Extension | Make-Up Length | Working Condition Grade | Bottom Connection Thread |
|---|---|---|---|---|---|---|
| L5011750120 | 1-3/4" | 0.4" | 2.125" | 30.24" | STD Standard | 1" AMMT |
| L5012125120 | 2-1/8" | 0.5" | 2.44" | 30.9" | STD Standard | 1-1/2" AMMT |
| L5012875120 | 2-7/8" | 0.75" | 3.125" | 30.9" | STD Standard | 2-3/8" PAC |
| L5013125120 | 3-1/8" | 0.875" | 3.5" | 37" | STD Standard | 2-3/8" PAC |
| L5013500120 | 3-1/2" | 1" | 3.8" | 37" | STD Standard | NC26 |
| L5011750320 | 1-3/4" | 0.4" | 2.125" | 30.24" | H₂S Sour Service | 1" AMMT |
| L5012125320 | 2-1/8" | 0.5" | 2.44" | 30.9" | H₂S Sour Service | 1-1/2" AMMT |
| L5012875320 | 2-7/8" | 0.75" | 3.125" | 30.9" | H₂S Sour Service | 2-3/8" PAC |
| L5013125320 | 3-1/8" | 0.875" | 3.5" | 37" | H₂S Sour Service | 2-3/8" PAC |
| L5013500320 | 3-1/2" | 1" | 3.8" | 37" | H₂S Sour Service | NC26 |
Note: Custom outer diameter, maximum grapple anchor extension range, anti-sulfur passivation coatings and non-standard length hydraulic anchor grapples are available via engineering consultation.
Core Features & Advantages
Full Well Depth Arbitrary Position Anchoring Function: Hydraulic actuated grapple anchor can form a reliable fixed anchor point at any depth inside tubing or casing wellbore, without limiting anchoring position to specific casing coupling or nipple sections, greatly improving the flexibility of downhole heavy workover construction layout.
Self-Locking Stable Anchoring Design Without Extra Load Demand: After hydraulic expansion grapple slips fully bite the pipe inner wall, the tool forms mechanical self-locking state. No continuous hydraulic circulating pressure or additional upward tensile load needs to be maintained during construction, eliminating hidden risks of anchor slip or retraction caused by load fluctuation.
Simple Pull-Release Unset Mechanism: Work completion unset operation has low construction threshold: only need to reduce surface pump flow rate to release hydraulic setting pressure, then lift coiled tubing string with slight slack weight; upward pulling force can retract grapple slips to close the anchor completely, realizing convenient tool string tripping without complex releasing pump ball or shear screw release structure.
High Torque Through Bearing Structural Design: The main body, grapple slip carrier and internal hydraulic transmission components adopt optimized thickened high-strength alloy torque transmission structure, with powerful torque through capability, capable of stably bearing large rotary torque generated by downhole power motors during casing cutting, hard formation milling and junk fishing heavy-load construction, avoiding structural deformation or anchoring failure under high torque load.
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", 1-3/4", 2-1/8", 2-7/8", 3-1/8" and 3-1/2" outer diameter specifications, fully compatible with global mainstream medium-size coiled tubing assemblies for all heavy-load cutting, milling and fishing intervention anchoring demands.
Multi-Type Standard Thread Compatibility: All product models are equipped with universal 1" AMMT, 1-1/2" AMMT, 2-3/8" PAC and NC26 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, hydraulic piston assembly, grapple slip sets and torque transmission matching components, featuring outstanding high-torque load resistance, high-pressure fluid erosion resistance and structural stability, extending long-term continuous heavy-load downhole positioning service life.
Application Scenarios
1. Coiled tubing heavy-load downhole intervention positioning treatments including casing cutting, hard formation milling, plug grinding, junk fishing and scale breakdown rotary construction operations
2. Conventional sweet crude oil well hydraulic grapple anchor high-torque positioning heavy workover service (STD standard service grade)
3. High-H₂S sour gas well corrosive environment coiled tubing hydraulic setting grapple anchor heavy-load milling, cutting and fishing downhole construction operations (H₂S sour service grade)
4. Downhole heavy workover projects requiring arbitrary depth fixed anchoring positioning, stable self-locking without continuous load maintenance and simple pull-release unset operation
5. Long-term continuous high-torque heavy-load rotary construction positioning safety protection for coiled tubing bottom-hole assemblies in onshore and offshore oilfield heavy workover intervention projects
Standard Delivery Package
Complete hydraulic anchor grapple integral pre-assembled unit including hydraulic actuating piston assembly, multiple sets of annular grapple slip cartridges, torque transmission carrier and standard bottom connection thread
Spare interchangeable grapple slip cartridge kit for on-site replacement when slips are worn
Full factory inspection test report including high-torque bearing load resistance test, integral tensile load test, hydraulic setting/unset operation calibration test and grapple slip pipe wall biting anchoring stability 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 hydraulic anchor grapple passes integral tensile load test, high-torque bearing calibration test, hydraulic setting/unset cycle test and grapple slip anchoring stability test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing heavy workover tool string matching, outer diameter & maximum anchor extension range selection and working condition grade consultation free of charge
Long-term spare parts supply: All interchangeable grapple slip cartridge wear accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom outer diameters, maximum grapple anchor extension ranges, bottom thread profiles, anti-corrosion coatings and special size hydraulic anchor grapples based on customer technical drawings
FAQ
Q1: What is the core function of a Hydraulic Anchor (Grapple)?
The Hydraulic Anchor (Grapple) is a hydraulic actuated coiled tubing downhole positioning anchor sub. It can be set at any arbitrary depth in tubing/casing by surface circulating fluid pressure, expanding annular grapple slips to bite pipe wall for fixed anchoring. It features self-locking structure that keeps stable without extra tension or pressure after setting, powerful high torque through capability for rotary milling/cutting/fishing. After work, simply reduce pump flow rate and lift CT string to retract slips and unset the tool easily.
Q2: What three core structural advantages does this hydraulic anchor grapple own?
1. Arbitrary full well depth anchoring capability, hydraulic drive enables fixed anchor point at any position inside wellbore, not limited to specific casing nipples or couplings, greatly improving heavy workover construction flexibility; 2. Self-locking stable anchoring design, after grapple slips fully engage pipe wall, mechanical self-locking takes effect, no continuous hydraulic pressure or additional tensile load required during construction, eliminating anchor slip risks caused by load fluctuation; 3. Simple pull-release unset mechanism, low operation threshold: reduce pump flow pressure then slightly lift coiled tubing string, slack upward pulling force can retract grapple slips to close anchor completely for smooth tripping out of well.
Q3: What outer diameter sizes do these hydraulic anchor grapples support?
Our standard production lineup fully covers outer diameters: 1-3/4", 2-1/8", 2-7/8", 3-1/8" and 3-1/2". All models adopt universal 1" AMMT, 1-1/2" AMMT, 2-3/8" PAC and NC26 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 hydraulic anchor grapples with special outer diameters or custom maximum grapple extension ranges 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 hydraulic anchor grapples, heavy duty motorhead assemblies, concentric coiled tubing wash tools (multi-mode), 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, hydraulic setting/unset cycle and grapple slip anchoring stability calibration testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, required maximum grapple anchor extension range, 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.
