Product Overview
The Hydraulic Anchor (High Expansion / Blade Grapple) is a flow-actuated internal retractable four-blade hydraulic setting coiled tubing anchor tool, specially developed for through-tubing pipe cutting heavy workover intervention operations. It can provide a reliable fixed centralizing anchor point at any arbitrary depth inside tubing or casing wellbore, cooperating with hydraulic cutters to realize stable high-torque positioning during through-tubing pipe cutting construction.
This anchor adopts an internal retractable four-blade grapple structural design: all four grapple blade slips are completely hidden inside the tool body when retracted, keeping the overall outer diameter fully consistent and uniform without protruding components. This unique design enables the anchor to smoothly pass through casing nipples, reduced diameter restriction sections and other wellbore bottleneck positions without tripping obstacles, greatly improving wellsite running-in operation efficiency.
The tool is driven by surface pump circulating flow for setting and retraction: when pumping fluid through the tool, hydraulic pressure pushes the internal piston downward to eject four grapple blades outward, the four evenly distributed blades fully contact the inner wall of tubing/casing to achieve centralizing mechanical anchoring locking. After completing pipe cutting work, simply stop surface pump circulation flow; internal spring return mechanism pushes the piston back to its original starting position, pulling all four grapple blades fully retract back into the tool body to release anchoring status, so the entire tool string can be tripped out of the well smoothly. The four-blade symmetrical layout ensures perfect centralization of the anchor inside tubulars and delivers maximum structural stability when bearing large rotary torque loads during cutting operations. The tool body features a full uninterrupted through bore design, allowing smooth passage of cutting chips, debris and circulating fluid without internal blockage.
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 wide anchor expansion range and 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 through-tubing pipe cutting heavy workover downhole service tools. Custom outer diameter, maximum anchor expansion 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 | Anchor Extension Range | Make-Up Length | Working Condition Grade | Bottom Connection Thread |
|---|---|---|---|---|---|---|
| L5241750120 | 1-3/4" | 0.4" | 2-7/8" ~ 3-1/2" | 30.24" | STD Standard | 1" AMMT |
| L5242125120 | 2-1/8" | 0.5" | 3-1/2" ~ 4-1/2" | 30.9" | STD Standard | 1-1/2" AMMT |
| L5242875120 | 2-7/8" | 0.75" | 4-1/2" ~ 5-1/2" | 30.9" | STD Standard | 2-3/8" PAC |
| L5243125120 | 3-1/8" | 0.875" | 4-1/2" ~ 5-1/2" | 37" | STD Standard | 2-3/8" PAC |
| L5243500120 | 3-1/2" | 1" | 5" ~ 5-1/2" | 37" | STD Standard | NC26 |
| L5241750320 | 1-3/4" | 0.4" | 2-7/8" ~ 3-1/2" | 30.24" | H₂S Sour Service | 1" AMMT |
| L5242125320 | 2-1/8" | 0.5" | 3-1/2" ~ 4-1/2" | 30.9" | H₂S Sour Service | 1-1/2" AMMT |
| L5242875320 | 2-7/8" | 0.75" | 4-1/2" ~ 5-1/2" | 30.9" | H₂S Sour Service | 2-3/8" PAC |
| L5243125320 | 3-1/8" | 0.875" | 4-1/2" ~ 5-1/2" | 37" | H₂S Sour Service | 2-3/8" PAC |
| L5243500320 | 3-1/2" | 1" | 5" ~ 5-1/2" | 37" | H₂S Sour Service | NC26 |
Note: Custom outer diameter, maximum anchor expansion range, anti-sulfur passivation coatings and non-standard length high expansion four-blade hydraulic anchors are available via engineering consultation.
Core Features & Advantages
Internal Retractable Four-Blade Grapple Design With Uniform OD: All grapple blade slips are fully hidden inside the tool body when retracted, maintaining consistent smooth outer diameter without protruding slips, enabling unobstructed passage through casing nipples, reduced diameter restriction sections and other wellbore bottleneck positions.
Four Symmetrical Blades Ensure Perfect Centralization & Maximum Stability: Four evenly distributed independent grapple blades expand synchronously during setting, forming symmetrical four-point contact with tubular inner wall, guaranteeing precise centralization of the entire tool string inside tubing/casing and outstanding anti-slip stability under high rotary torque loads generated by hydraulic cutters.
Simple Flow On/Off Actuated Setting & Retraction Mechanism: Operation logic is concise and reliable: activate surface pump circulation flow to push piston downward and extend four blades outward to complete anchoring; cease pump flow after construction work, internal spring return assembly automatically pulls all blades fully retract back into tool body to release anchoring state, no additional lifting, dropping or shear screw release operation required.
Full Uninterrupted Through Bore Structural Design: The tool center is equipped with a complete straight through passage without internal protrusions or blockage points, allowing unimpeded circulation of downhole treatment fluid and smooth discharge of cutting metal chips and debris generated during pipe cutting construction, effectively avoiding internal tool blockage risks.
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 pipe cutting heavy workover conditions.
Full Outer Diameter Size Compatibility: Standard product series covers 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 through-tubing pipe cutting heavy-load 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, four sets of grapple blade slips and spring return matching components, featuring outstanding high-torque load resistance, high-pressure fluid erosion resistance and structural durability, extending long-term continuous downhole pipe cutting positioning service life.
Application Scenarios
1. Coiled tubing through-tubing pipe cutting heavy-load downhole intervention positioning treatments, including tubing cutting, casing section cutting and damaged pipe string severance rotary construction operations
2. Conventional sweet crude oil well four-blade high expansion hydraulic anchor centralizing positioning pipe cutting heavy workover service (STD standard service grade)
3. High-H₂S sour gas well corrosive environment coiled tubing internal retractable blade grapple anchor through-tubing pipe cutting downhole construction operations (H₂S sour service grade)
4. Downhole pipe cutting heavy workover projects requiring smooth passage through casing nipples and reduced diameter restriction sections, precise centralizing positioning and simple flow-controlled setting/retraction operation
5. Long-term continuous high-torque pipe cutting rotary construction positioning safety protection for coiled tubing bottom-hole assemblies in onshore and offshore oilfield through-tubing cutting heavy workover intervention projects
Standard Delivery Package
Complete high expansion four-blade hydraulic anchor integral pre-assembled unit including hydraulic flow actuating piston assembly, four sets of internal retractable grapple blade slip cartridges, spring return reset mechanism and standard bottom connection thread
Spare interchangeable grapple blade slip cartridge kit for on-site replacement when blade slips are worn or damaged
Full factory inspection test report including high-torque bearing load resistance test, integral tensile load test, flow-driven setting/retraction cycle calibration test and four-blade tubular centralization 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 high expansion four-blade hydraulic anchor passes integral tensile load test, high-torque bearing calibration test, flow setting/retraction cycle durability test and four-blade centralization anchoring stability test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing pipe cutting heavy workover tool string matching, outer diameter & anchor expansion range selection and working condition grade consultation free of charge
Long-term spare parts supply: All interchangeable grapple blade slip cartridge wear accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom outer diameters, maximum anchor expansion ranges, bottom thread profiles, anti-corrosion coatings and special size high expansion four-blade hydraulic anchors based on customer technical drawings
FAQ
Q1: What is the core function of a Hydraulic Anchor (High Expansion / Blade Grapple)?
The Hydraulic Anchor (High Expansion / Blade Grapple) is a flow-operated internal retractable four-blade coiled tubing anchor sub, specially designed for through-tubing pipe cutting operations. When pump fluid circulates through the tool, hydraulic pressure pushes the piston down to extend four symmetrical grapple blades outward to bite the pipe inner wall for centralizing fixed anchoring; stop pump flow after construction, internal spring retracts all blades fully back into the tool body to release anchoring. All blades are hidden inside the tool when retracted to keep uniform OD, enabling smooth passing through casing nipples and restriction sections. Four-point symmetrical contact delivers maximum stability against high torque during cutting, and the full uninterrupted through bore allows free circulation and chip discharge.
Q2: What three core structural advantages does this high expansion four-blade hydraulic anchor own?
1. Internal retractable blade grapple uniform outer diameter design: all four grapple slips fully retract into the tool body without protruding parts, the smooth consistent OD ensures unobstructed passage through casing nipples, reduced diameter bottleneck sections and other wellbore restrictions during running-in; 2. Four symmetrical blade layout for perfect centralization and maximum anchoring stability: four evenly distributed blades expand synchronously to form four-point balanced contact with tubular inner wall, realizing precise centralization of the tool string and outstanding anti-slip bearing capacity under large rotary torque loads generated by hydraulic cutters; 3. Simple flow on/off actuated setting and retraction mechanism, low operation threshold without complex auxiliary release procedures: activate surface pump circulation to extend blades for anchoring; cease pump flow after construction work, built-in spring reset assembly automatically pulls all grapple blades fully retract back into the tool body to release anchoring state for smooth tripping out of the well.
Q3: What outer diameter sizes do these high expansion four-blade hydraulic anchors 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 high expansion four-blade hydraulic anchors with special outer diameters or custom anchor expansion 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 high expansion four-blade hydraulic anchors, annular grapple hydraulic anchors, 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, flow setting/retraction cycle and four-blade centralization 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 anchor expansion 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.
