Product Overview
The Magnetic Fishing Rod (Round / Full Circumference Magnet Type) is a full-circumference circular permanent magnetic fishing retrieval bar specially developed for coiled tubing downhole wellbore cleanout and tiny loose metal scrap debris salvage workover operations.
This round magnetic fishing rod adopts a central-mounted full-circumference circular permanent magnet layout design; the high-performance high-temperature resistant permanent magnet assembly is installed and fixed at the central segment of the integral rod main body, the circular magnet structure delivers uniform 360° full circumferential magnetic field coverage across the entire outer diameter of the tool, completely eliminating magnetic field blind zones on the rod outer surface, greatly expanding magnetic contact area with downhole tiny metal scrap fragments and significantly improving metal debris salvage capture efficiency. The total effective length of the central permanent magnet assembly is adjustable, construction crews can freely configure the magnet segment length to adapt to different wellbore debris accumulation thickness and metal scrap particle size construction conditions.
Two independent working condition material grade configuration options are provided for this round magnetic fishing rod to adapt to variable downhole wellbore fluid corrosive environments:
Standard grade: Manufactured from high-quality carbon steel blank, suitable for conventional non-corrosive downhole wellbore construction environments without high-concentration hydrogen sulfide (H₂S) corrosive medium;
H₂S sour service grade: Adopts special high-sulfur corrosion-resistant alloy blank, with excellent anti-sulfide stress cracking performance and strong resistance to acid corrosive formation fluid erosion, specially applicable to high-sulfur H₂S containing corrosive downhole wellbore construction conditions.
The round magnetic fishing rod 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 round magnetic fishing rod down along the wellbore until the central full-circumference permanent magnet assembly contacts tiny loose metal scrap debris at the well bottom, and the uniform 360° circumferential magnetic field will automatically generate powerful magnetic adsorption force to capture and lock tiny metal scrap fragments; 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 2-1/8" to 3-1/8", with fixed closed make-up length specifications, and provides two independent material grade selection options: standard grade and H₂S sour service corrosion-resistant grade. The product is equipped with standard 1-1/2"AMMT and 2-3/8"PAC bottom connection threads for universal compatibility with mainstream coiled tubing connectors and other downhole wellbore cleanout workover service tools. Custom outer diameter, permanent magnet assembly effective length and base material corrosion resistance grade customization are available upon customer technical drawing submission.
Complete Technical Specification Table
| PN Part Number | Outer Diameter OD | Make-Up Length (Closed) | Working Condition Grade | Bottom Connection Thread |
|---|---|---|---|---|
| L3172125120 | 2-1/8" | 9.6" | STD Standard | 1-1/2" AMMT |
| L3172875120 | 2-7/8" | 13" | STD Standard | 2-3/8" PAC |
| L3173125120 | 3-1/8" | 15" | STD Standard | 2-3/8" PAC |
| L3172125320 | 2-1/8" | 9.6" | H₂S Sour Service | 1-1/2" AMMT |
| L3172875320 | 2-7/8" | 13" | H₂S Sour Service | 2-3/8" PAC |
| L3173125320 | 3-1/8" | 15" | H₂S Sour Service | 2-3/8" PAC |
Note: Custom outer diameter, permanent magnet assembly effective length and base material corrosion resistance grade modification round full-circumference magnetic fishing rods are available via engineering consultation. Two working condition grades (STD standard carbon steel / H₂S sour service anti-corrosion alloy) are optional for each outer diameter size, and the working condition grade needs to be clearly confirmed according to the downhole wellbore fluid H₂S concentration corrosive environment during order placement; the effective length of the central full-circumference permanent magnet assembly can be customized to match different wellbore debris accumulation thickness demands.
Core Features & Advantages
Central-Mounted Full-Circumference Circular Permanent Magnet Layout Design: High-performance high-temperature resistant permanent magnet segment is fixedly installed at the central segment of the integral rod main body, the circular magnet structure creates uniform 360° full circumferential magnetic field coverage across the entire outer diameter of the tool, completely eliminating magnetic field blind zones on the rod outer surface, greatly expanding magnetic contact area with downhole tiny metal scrap fragments and significantly improving metal debris salvage capture efficiency.
Adjustable Permanent Magnet Assembly Effective Length Configuration: The total effective magnetic coverage length of the central permanent magnet assembly can be freely adjusted and configured to adapt to different wellbore debris accumulation thickness and metal scrap particle size construction demands, realizing flexible matching of magnetic adsorption range according to actual downhole debris distribution conditions.
Dual Independent Working Condition Material Grade Optional Configuration: Two complete base material grade versions are provided for free independent selection to fully match different downhole wellbore fluid corrosive environment construction demands: standard carbon steel grade is suitable for conventional non-corrosive wellbore construction environments without high-concentration H₂S corrosive medium; H₂S sour service high-corrosion-resistant alloy grade has excellent anti-sulfide stress cracking performance and strong acid fluid erosion resistance, specially applicable to high-sulfur H₂S containing corrosive downhole wellbore construction conditions.
Ultra-Simplified Wellsite Operation Logic: The round magnetic fishing rod 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 round magnetic fishing rod down along the wellbore until the central full-circumference permanent magnet assembly contacts tiny loose metal scrap debris at the well bottom, and the uniform 360° circumferential magnetic field will automatically generate powerful magnetic adsorption force to capture and lock tiny metal scrap fragments; 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 monolithic rod body eliminates vulnerable split assembly movable friction parts; after each metal scrap debris salvage operation, only simple surface magnet and outer cylinder wall debris cleaning inspection are required, no complex disassembly, internal permanent magnet segment replacement or spring preload adjustment maintenance procedures, greatly reducing daily maintenance labor and spare parts inventory cost.
Full Outer Diameter Size Compatibility & Dual Material Grade Matching: Standard product series covers 2-1/8", 2-7/8" and 3-1/8" outer diameter specifications, each OD size supports two independent material grade versions for free matching selection: standard carbon steel grade and H₂S sour service high-corrosion-resistant alloy grade, fully compatible with global mainstream medium-size coiled tubing assemblies for all tiny loose metal scrap debris salvage recovery intervention demands.
Multi-Type Standard Thread Compatibility: All product models are equipped with universal 1-1/2"AMMT and 2-3/8"PAC bottom connection threads, realizing seamless assembly with global mainstream coiled tubing bottom-hole assemblies and other supporting downhole wellbore cleanout workover tools without extra conversion subs.
Precision CNC High-Strength Alloy Steel Manufacturing: Adopts precision CNC full-body machining of high-strength wear-resistant carbon steel / anti-H₂S corrosion alloy steel blank, integral one-piece forming process for rod main body, high-temperature resistant permanent magnet segments are firmly fixed at the central rod segment with anti-drop locking structure, featuring outstanding circulating fluid erosion resistance, repeated magnetic adsorption load fatigue resistance and structural stability, extending long-term continuous tiny loose metal scrap debris salvage retrieval service life for downhole coiled tubing workover operations.
Application Scenarios
1. Coiled tubing downhole tiny loose metal scrap debris salvage recovery heavy-load intervention treatments, including tiny drill cuttings, perforating gun micro metal fragments, small fallen nut/bolt debris and other tiny loose metal junk fragment salvage construction operations
2. Conventional sweet crude oilfield central full-circumference circular magnetic fishing rod tiny loose metal scrap debris salvage fishing workover service (STD Standard carbon steel working condition grade)
3. High-sulfur H₂S containing corrosive downhole wellbore construction project tiny loose metal scrap debris salvage heavy workover projects requiring H₂S sour service anti-sulfide stress cracking high-corrosion-resistant alloy material grade
4. Long-term continuous repeated magnetic adsorption load safety protection for coiled tubing bottom-hole assemblies in onshore and offshore oilfield tiny loose metal scrap debris salvage recovery heavy workover intervention projects
Standard Delivery Package
Complete round full-circumference magnetic fishing rod integral monolithic pre-assembled unit including integral rod main body and central fixed full-circumference high-temperature resistant permanent magnet assembly with anti-drop locking structure
Spare interchangeable full-circumference permanent magnet segment maintenance kit with multiple effective length specifications for on-site magnetic adsorption range adjustment or worn magnet segment replacement
Full factory inspection test report including repeated magnetic adsorption load fatigue resistance test, integral tensile load test, central permanent magnet segment anti-drop locking stability calibration test and full-circumference magnetic field metal scrap debris capture reliability performance test data
Product dimension drawing and official installation & operation instruction manual, with detailed on-site tiny loose metal scrap debris salvage magnetic adsorption operation guidance, with clear reminder to select STD standard carbon steel grade or H₂S sour service anti-corrosion alloy grade according to downhole wellbore fluid H₂S concentration corrosive environment during order placement, and confirm required permanent magnet assembly effective length for different debris accumulation thickness construction conditions
Quality Warranty & After-Sales Service
Warranty Coverage: 12 months after factory shipment or 2000 cumulative magnetic adsorption load cycles, whichever condition is reached first
Full factory inspection: Each finished round full-circumference magnetic fishing rod passes integral tensile load test, repeated magnetic adsorption load fatigue test, central permanent magnet segment anti-drop locking stability calibration test and full-circumference magnetic field metal scrap debris capture reliability performance test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing tiny loose metal scrap debris salvage heavy workover tool string matching, outer diameter & working condition grade (STD / H₂S) selection and permanent magnet assembly effective length customization consultation free of charge
Long-term spare parts supply: All interchangeable full-circumference permanent magnet segment wear accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom outer diameters, customized central permanent magnet assembly effective lengths, base material corrosion resistance grade modification, bottom thread profiles and special size round full-circumference magnetic fishing rods based on customer technical drawings
FAQ
Q1: What is the core function of a Magnetic Fishing Rod (Round / Full Circumference Magnet Type)?
The Magnetic Fishing Rod (Round / Full Circumference Magnet Type) is a central full-circumference circular permanent magnetic fishing retrieval bar dedicated to coiled tubing downhole wellbore cleanout and tiny loose metal scrap debris salvage fishing workover operations. It adopts central-mounted full-circumference circular permanent magnet layout design, high-performance high-temperature resistant permanent magnet segment fixed at the central rod section, uniform 360° full circumferential magnetic field coverage eliminates magnetic blind zones to maximize magnetic contact area with tiny metal scrap fragments and boost salvage capture efficiency; the effective length of the central permanent magnet assembly is adjustable to adapt to different wellbore debris accumulation thickness construction conditions. 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 construction conditions. No complex internal movable friction components or spring assemblies are equipped, operation flow is highly simplified, widely applied for salvage of tiny drill cuttings, perforating gun micro metal fragments, small fallen nut/bolt debris and other tiny loose metal scrap junk fragments inside wellbores.
Q2: What three core structural advantages does this Round Full-Circumference Magnetic Fishing Rod own?
1. Central-mounted full-circumference circular permanent magnet layout design, high-performance high-temperature resistant permanent magnet segment fixedly installed at the central segment of the integral rod main body, the circular magnet structure creates uniform 360° full circumferential magnetic field coverage across the entire outer diameter of the tool, completely eliminating magnetic field blind zones on the rod outer surface, greatly expanding magnetic contact area with downhole tiny metal scrap fragments and significantly improving metal debris salvage capture efficiency; 2. Adjustable permanent magnet assembly effective length configuration, the total effective magnetic coverage length of the central permanent magnet assembly can be freely adjusted and configured to adapt to different wellbore debris accumulation thickness and metal scrap particle size construction demands, realizing flexible matching of magnetic adsorption range according to actual downhole debris distribution conditions; 3. Dual independent working condition material grade optional configuration & ultra-simplified wellsite operation logic, two complete base material grade versions are provided for free matching selection to fully match different downhole wellbore fluid corrosive environment construction demands: standard carbon steel grade is suitable for conventional non-corrosive wellbore construction environments without high-concentration H₂S corrosive medium; H₂S sour service high-corrosion-resistant alloy grade has excellent anti-sulfide stress cracking performance and strong acid fluid erosion resistance, specially applicable to high-sulfur H₂S containing corrosive downhole wellbore construction conditions; the round magnetic fishing rod has no complex internal movable friction components, spring energy storage assemblies or differential pressure release mechanisms, only need to run the round magnetic fishing rod down along the wellbore until the central full-circumference permanent magnet assembly contacts tiny loose metal scrap debris at the well bottom, and the uniform 360° circumferential magnetic field will automatically generate powerful magnetic adsorption force to capture and lock tiny metal scrap fragments; 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.
Q3: What outer diameter sizes and configurable options do these Round Full-Circumference Magnetic Fishing Rods support?
Our standard production lineup fully covers outer diameters: 2-1/8", 2-7/8" and 3-1/8". 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 adopt universal 1-1/2"AMMT and 2-3/8"PAC bottom connection threads compatible with global mainstream coiled tubing connector assemblies and other supporting downhole wellbore cleanout workover tools. Custom central permanent magnet assembly effective lengths and base material corrosion resistance grade specifications are available upon customer downhole wellbore fluid H₂S concentration corrosive environment and debris accumulation thickness 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 round full-circumference magnetic fishing rods with special outer diameters or customized central permanent magnet assembly effective lengths & base material corrosion resistance grade specifications 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 round full-circumference magnetic fishing rods, V-groove 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 magnetic adsorption load fatigue, central permanent magnet segment anti-drop locking stability calibration and full-circumference magnetic field metal scrap debris capture reliability performance 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 central permanent magnet assembly effective length, 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 tiny loose metal scrap debris salvage magnetic adsorption 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 permanent magnet assembly effective length confirmation according to downhole debris accumulation thickness during order placement.
