Product Overview
The Thru Tubing Underreamer through-tubing hydraulic retractable blade bore reaming tool is a special through-tubing reaming device developed for coiled tubing downhole borehole scale cleaning, cement ring milling and bore enlargement remedial workover operations.
This underreamer is designed for matched combined use with positive displacement motors (PDM / screw drilling motors), realizing integrated one-step operation of cement ring milling and bore enlargement after connecting a drill bit at the lower end of the tool. All cutting blades adopt hydraulic piston thrust driven retractable structural design: the circulating fluid pressure inside the drill string generates piston driving force to push all cutting blades outward to fully extend to the working reaming position; once the surface circulation pump stops pumping, the internal hydraulic pressure disappears, and all cutting blades automatically retract back to the outer cylindrical surface of the tool body, so that the whole tool assembly can smoothly pass through small inner diameter restrictions inside the tubing. The effective extension length of the cutting blades is freely adjustable, which can realize variable reaming diameter range to adapt to different bore enlargement construction demands.
The Thru Tubing Underreamer has no complex internal movable friction components, spring energy storage assemblies or differential pressure release mechanisms, with extremely simplified wellsite operation flow and low maintenance cost; construction crews only need to run the underreamer down along the tubing inner wall until the target cement ring or borehole enlargement section is reached, start the surface circulation pump to drive the cutting blades outward to extend to the working position, and apply rotary torque through the matched PDM motor to realize continuous cement ring milling and borehole reaming cutting work; stop pumping circulation to release internal hydraulic pressure, all cutting blades automatically retract back to the tool body for full tool string pulling out, no additional auxiliary operation steps such as drop ball delivery or shear pin impact jarring are needed, shortening wellsite operation time and reducing human error risks.
The standardized product lineup covers outer diameter sizes ranging from 1-11/16" to 3-1/2", with complete outer diameter specification series to match different tubing inner diameter constraint conditions and different bore enlargement construction demands. Each specification adopts standard working condition configuration; custom outer diameter, cutting blade adjustable length range and base material corrosion resistance grade customization are available upon customer technical drawing submission.
Complete Technical Specification Table
| PN Part Number | OD Outer Diameter | Reaming Range | Make-Up Length | Working Condition Grade | Connection Thread |
|---|---|---|---|---|---|
| L5031690120 | 1-11/16" | 2 7/8" ~ 3 1/2" | 13.09" | STD Standard | 1" AMMT |
| L5032125120 | 2-1/8" | 3 1/2" ~ 4 1/2" | 15.15" | STD Standard | 1-1/2" AMMT |
| L5032875120 | 2-7/8" | 4" ~ 5 1/2" | 17.76" | STD Standard | 2-3/8" PAC |
| L5033125120 | 3-1/8" | 5-1/2" ~ 7" | 20" | STD Standard | 2-3/8" REG |
| L5033500120 | 3-1/2" | 5-1/2" ~ 7" | 20" | STD Standard | 2-3/8" REG |
Note: Custom outer diameter, cutting blade adjustable effective extension length range and base material corrosion resistance grade modification thru-tubing hydraulic retractable blade underreamers are available via engineering consultation. All standard specifications adopt STD standard working condition configuration; custom H₂S sour service anti-sulfide stress cracking high-corrosion-resistant alloy material grade is optional for high-sulfur corrosive downhole wellbore fluid environment construction conditions. Multiple types of connection threads (AMMT / PAC / REG) are standard matching options for each specification to adapt to different coiled tubing tool string connection matching demands.
Core Features & Advantages
Positive Displacement Motor (PDM) Matched Combined Use Design: The whole underreamer assembly is specially matched for combined use with screw positive displacement motors (PDM); a drill bit can be connected to the lower end of the tool to realize integrated one-step operation of cement ring milling and bore enlargement, simplifying downhole operation procedures and improving construction efficiency.
Hydraulic Piston Thrust Driven Retractable Cutting Blade Structural Design: All cutting blades adopt hydraulic piston thrust driven retractable structural design; the circulating fluid pressure inside the drill string generates piston driving force to push all cutting blades outward to fully extend to the working reaming position; once the surface circulation pump stops pumping, the internal hydraulic pressure disappears, and all cutting blades automatically retract back to the outer cylindrical surface of the tool body, so that the whole tool assembly can smoothly pass through small inner diameter restrictions inside the tubing.
Freely Adjustable Effective Cutting Blade Extension Length Configuration: The effective extension length of the cutting blades can be freely adjusted, which can realize variable reaming diameter range to adapt to different bore enlargement construction demands, realizing flexible matching of reaming radius according to actual downhole borehole size requirements.
Complete Outer Diameter Size Range Coverage: The applicable outer diameter size range of the thru-tubing hydraulic retractable blade underreamer covers 1-11/16" to 3-1/2", with complete outer diameter specification series to match different tubing inner diameter constraint conditions and different bore enlargement construction demands.
Ultra-Simplified Wellsite Operation Logic: The thru-tubing underreamer has no complex internal movable friction components, spring energy storage assemblies or differential pressure release mechanisms, the operation flow is highly streamlined: only need to run the underreamer down along the tubing inner wall until the target cement ring or borehole enlargement section is reached, start the surface circulation pump to drive the cutting blades outward to extend to the working position, and apply rotary torque through the matched PDM motor to realize continuous cement ring milling and borehole reaming cutting work; stop pumping circulation to release internal hydraulic pressure, all cutting blades automatically retract back to the tool body for full tool string pulling out, no complex auxiliary operation steps such as drop ball delivery or shear pin impact jarring are needed to shorten wellsite operation time and reduce human error risks.
Low Routine Maintenance Design: The integral cylindrical alloy steel tool body eliminates vulnerable split assembly movable wear parts; after each borehole cleaning or cement ring milling operation, only simple surface cutting blade hard alloy debris cleaning and internal hydraulic piston passage blockage flushing inspection are required, no complex disassembly, internal cutting blade replacement or spring preload adjustment maintenance procedures, greatly reducing daily maintenance labor and spare parts inventory cost.
Application Scenarios
1. Coiled tubing downhole borehole inner wall scale cleaning, cement ring milling, bore enlargement heavy-load intervention treatments, including cement ring solid obstacles, borehole inner wall scale deposits and other downhole inner wall obstacle reaming and removal remedial workover construction operations
2. Conventional sweet crude oilfield hydraulic retractable adjustable blade thru-tubing underreamer borehole cleaning, cement ring milling and bore enlargement remedial workover service (STD Standard carbon steel working condition grade)
3. High-sulfur H₂S containing corrosive downhole wellbore fluid construction project cement ring milling and bore enlargement heavy workover projects requiring H₂S sour service anti-sulfide stress cracking high-corrosion-resistant alloy material grade
4. Long-term continuous repeated hydraulic piston retractable blade opening/closing and rotary reaming cutting load safety protection for coiled tubing bottom-hole assemblies in onshore and offshore oilfield borehole cleaning, cement ring milling and bore enlargement remedial workover intervention projects
Standard Delivery Package
Complete thru-tubing hydraulic retractable blade underreamer integral cylindrical pre-assembled unit including main tool cylinder body, internal hydraulic piston drive mechanism and multiple groups of adjustable effective extension length retractable cutting blades
Spare interchangeable cutting blade hard alloy cutting particle maintenance kit for on-site worn cutting blade hard alloy surface replacement
Full factory inspection test report including repeated hydraulic piston blade opening/closing load fatigue resistance test, integral tensile load test, circulating fluid hydraulic pressure blade extension retraction stability calibration test and cutting blade reaming diameter adjustment range verification test data
Product dimension drawing and official installation & operation instruction manual, with detailed on-site coiled tubing borehole cleaning, cement ring milling and bore enlargement operation guidance, with clear confirmation reminder for working condition grade selection (STD standard carbon steel for non-corrosive well / H₂S sour service anti-corrosion alloy for high-sulfur corrosive well) and cutting blade adjustable effective extension length range confirmation according to different bore enlargement construction demands during order placement
Quality Warranty & After-Sales Service
Warranty Coverage: 12 months after factory shipment or 2000 cumulative hydraulic piston blade opening/closing & rotary reaming cutting load cycles, whichever condition is reached first
Full factory inspection: Each finished thru-tubing hydraulic retractable blade underreamer passes integral tensile load test, repeated hydraulic piston blade opening/closing load fatigue test, circulating fluid hydraulic pressure blade extension retraction stability calibration test and cutting blade reaming diameter adjustment range verification test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing borehole cleaning, cement ring milling and bore enlargement remedial workover tool string matching, outer diameter & working condition grade (STD / H₂S) selection and cutting blade adjustable effective extension length range selection consultation free of charge
Long-term spare parts supply: All interchangeable cutting blade hard alloy cutting particle wear accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom outer diameters, customized cutting blade adjustable effective extension length range specifications, base material corrosion resistance grade modification, bottom coiled tubing connection thread profiles and special size thru-tubing hydraulic retractable blade underreamers based on customer technical drawings
FAQ
Q1: What is the core function of a Thru Tubing Underreamer Hydraulic Retractable Blade Through-Tubing Reaming Tool?
The Thru Tubing Underreamer is a through-tubing hydraulic retractable blade reaming tool dedicated for coiled tubing downhole borehole inner wall scale cleaning, cement ring milling and bore enlargement remedial workover operations. The tool is designed for matched combined use with positive displacement motors (PDM / screw drilling motors), a drill bit can be connected to the lower end to realize integrated one-step operation of cement ring milling and bore enlargement. All cutting blades adopt hydraulic piston thrust driven retractable structural design; circulating fluid pressure generates piston driving force to push all cutting blades outward to extend to the working reaming position; once the surface circulation pump stops pumping, internal hydraulic pressure disappears, and all cutting blades automatically retract back to the tool body, enabling the whole tool assembly to smoothly pass through small inner diameter restrictions inside the tubing. The effective extension length of the cutting blades is freely adjustable to realize variable reaming diameter range to adapt to different bore enlargement construction demands. The applicable outer diameter size range covers 1-11/16" to 3-1/2". Two independent working condition material grade options are provided: STD standard carbon steel grade for conventional non-corrosive wellbore environments without high-concentration H₂S corrosive medium; H₂S sour service high-corrosion-resistant alloy grade for high-sulfur H₂S containing corrosive downhole wellbore fluid construction conditions. No complex internal movable friction components or spring assemblies are equipped, operation flow is highly simplified, widely applied for coiled tubing downhole borehole inner wall scale cleaning, cement ring milling and bore enlargement remedial workover construction operations.
Q2: What three core structural advantages does this Thru Tubing Underreamer Hydraulic Retractable Blade Through-Tubing Reaming Tool own?
1. Positive displacement motor (PDM) matched combined use design, the whole underreamer assembly is specially matched for combined use with screw positive displacement motors (PDM); a drill bit can be connected to the lower end of the tool to realize integrated one-step operation of cement ring milling and bore enlargement, simplifying downhole operation procedures and improving construction efficiency; 2. Hydraulic piston thrust driven retractable cutting blade structural design, all cutting blades adopt hydraulic piston thrust driven retractable structural design; the circulating fluid pressure inside the drill string generates piston driving force to push all cutting blades outward to fully extend to the working reaming position; once the surface circulation pump stops pumping, the internal hydraulic pressure disappears, and all cutting blades automatically retract back to the outer cylindrical surface of the tool body, so that the whole tool assembly can smoothly pass through small inner diameter restrictions inside the tubing; 3. Freely adjustable effective cutting blade extension length configuration & ultra-simplified wellsite operation logic, the effective extension length of the cutting blades can be freely adjusted, which can realize variable reaming diameter range to adapt to different bore enlargement construction demands, realizing flexible matching of reaming radius according to actual downhole borehole size requirements; the thru-tubing underreamer has no complex internal movable friction components, spring energy storage assemblies or differential pressure release mechanisms, only need to run the underreamer down along the tubing inner wall until the target cement ring or borehole enlargement section is reached, start the surface circulation pump to drive the cutting blades outward to extend to the working position, and apply rotary torque through the matched PDM motor to realize continuous cement ring milling and borehole reaming cutting work; stop pumping circulation to release internal hydraulic pressure, all cutting blades automatically retract back to the tool body for full tool string pulling out, no complex auxiliary operation steps such as drop ball delivery or shear pin impact jarring are needed to shorten wellsite operation time and reduce human error risks; the product also features complete outer diameter size range coverage and integral cylindrical tool body low maintenance design to further expand applicable construction scope and reduce post-operation maintenance workload.
Q3: What outer diameter sizes and configurable options do these Thru Tubing Underreamer Hydraulic Retractable Blade Through-Tubing Reaming Tools support?
Our standard applicable outer diameter size range covers 1-11/16", 2-1/8", 2-7/8", 3-1/8" and 3-1/2". Each OD size supports two independent working condition material grade versions for free matching selection: STD standard carbon steel working condition grade and H₂S sour service high-corrosion-resistant alloy working condition grade. All models support custom coiled tubing bottom connection threads (AMMT / PAC / REG) compatible with global mainstream coiled tubing connector assemblies and other supporting downhole borehole cleaning, cement ring milling and bore enlargement remedial workover tools. Custom cutting blade adjustable effective extension length range specifications and base material corrosion resistance grade specifications are available upon customer downhole wellbore fluid H₂S concentration corrosive environment and different bore enlargement construction demands.
Q4: 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 thru-tubing hydraulic retractable blade underreamers with special outer diameters or customized cutting blade adjustable effective extension length range specifications, base material corrosion resistance grade specifications & bottom connection thread profiles require 20–35 working days production cycle, subject to total order quantity and customization scope.
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 thru-tubing hydraulic retractable blade underreamers, tapered pear conical pilot milling shoes, concave recessed milling shoes, five-blade five-wing milling shoes, flat bottom milling shoes, combination flat blade milling shoes, muncher multi-cutting milling shoes, convex nose pilot milling shoes, magnetic fishing rods, magnetic junk retrieval magnets, venturi junk baskets, flow activated releasable fishing overshots, flow activated releasable fishing spears, flow activated releasable JDC running/pulling tools, flow activated releasable GS fishing tools, bi-direction mechanical accelerators, bi-direction hydraulic accelerators, bi-direction hydraulic jars, up-stroke hydraulic jars, bi-direction mechanical jars, up-stroke mechanical jars, wireline grabs, wireline spears and all other supporting downhole fishing, jarring, anchoring and washing service tools. Every finished product undergoes strict factory tensile load, repeated hydraulic piston blade opening/closing load fatigue, circulating fluid hydraulic pressure blade extension retraction stability calibration test and cutting blade reaming diameter adjustment range verification testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, required working condition grade (STD standard carbon steel / H₂S sour service anti-corrosion alloy), required cutting blade adjustable effective extension length range, downhole wellbore fluid H₂S concentration corrosive environment construction conditions, working environment 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, and provide professional on-site coiled tubing borehole cleaning, cement ring milling and bore enlargement operation guidance, with clear confirmation reminder for working condition grade selection (STD standard carbon steel for non-corrosive well / H₂S sour service anti-corrosion alloy for high-sulfur corrosive well) and cutting blade adjustable effective extension length range confirmation according to different bore enlargement construction demands during order placement.
