Product Overview
The Lead Impression Block is a soft lead downhole fish outer contour profile sampling mold tool specially developed for coiled tubing downhole pre-workover operations of capturing the outer geometric shape of fallen downhole fish junk to confirm accurate dimensional data and select the most matched subsequent fishing salvage tools.
This lead impression block adopts a bottom-mounted soft lead weight assembly design; malleable soft lead material is used for the lower sampling weight, when the lead impression block is lowered to contact the top of downhole fish junk target, the axial weight of the tool body will drive the soft lead weight to fully deform and imprint the precise top geometric outline of the fish junk, providing reliable accurate outer contour and dimension reference data for field engineers to select corresponding matched fishing tools. A built-in fixed retaining pin mechanical limit barrier is installed directly below the soft lead weight assembly, the pin forms a stop structure to lock the soft lead block and effectively eliminate the risk of the malleable soft lead assembly loosening and falling off during wellbore running-in or tripping-out operations. Integrated through-type circulation wash holes penetrate the full thickness of the tool body, independent dedicated fluid circulation flushing passages are reserved, enabling continuous long-duration wellbore fluid circulation and fish debris flushing cleaning operations while the lead impression block remains run into the wellbore, no repeated tripping out of the well is required to complete debris washing work, greatly improving overall pre-workover construction efficiency.
Two independent working condition material grade configuration options are provided for this lead impression block 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 Lead Impression Block 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 lead impression block down along the wellbore until the lower soft lead weight contacts the top of downhole fish junk target, apply light axial weight to complete soft lead deformation and fish contour imprint sampling work, and the built-in circulation wash holes support continuous wellbore fluid circulation and debris flushing cleaning operations during the whole sampling process, 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 2.3" to 3-5/8", 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"AMMT, 1-1/2"AMMT, 2-3/8"PAC and 2-3/8"REG bottom connection threads for universal compatibility with mainstream coiled tubing connectors and other downhole pre-workover fish sampling service tools. Custom outer diameter, soft lead weight thickness 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 |
|---|---|---|---|---|
| L3122300120 | 2.3" | 6" | STD Standard | 1" AMMT |
| L3123000120 | 3" | 8" | STD Standard | 1-1/2" AMMT |
| L3123700120 | 3.7" | 9.4" | STD Standard | 2-3/8" PAC |
| L3124000120 | 4" | 11.1" | STD Standard | 2-3/8" REG |
| L3122300320 | 2.3" | 6" | H₂S Sour Service | 1" AMMT |
| L3123000320 | 3" | 8" | H₂S Sour Service | 1-1/2" AMMT |
| L3123700320 | 3.7" | 9.4" | H₂S Sour Service | 2-3/8" PAC |
| L3124000320 | 4" | 11.1" | H₂S Sour Service | 2-3/8" REG |
Note: Custom outer diameter, soft lead weight thickness and base material corrosion resistance grade modification lead impression blocks 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.
Core Features & Advantages
Bottom-Mounted Malleable Soft Lead Weight Sampling Design: Soft lead malleable weight assembly is installed at the lower end of the impression block, under axial tool weight the soft lead can fully deform and accurately copy the precise top outer contour geometric outline of downhole fish junk target, providing reliable accurate dimensional and shape reference data for field engineers to select corresponding matched fishing salvage tools, avoiding fishing tool mismatching failure risks.
Built-In Anti-Drop Fixed Retaining Pin Mechanical Limit Structure: A fixed stop pin is rigidly mounted directly below the soft lead weight assembly, the pin forms a physical limit barrier to lock the soft lead block assembly in position, completely eliminating the risk of malleable soft lead loosening, shifting and falling off during wellbore running-in or tripping-out operations, ensuring sampling integrity.
Integrated Through-Type Circulation Wash Hole Layout: Independent dedicated fluid circulation flushing passages penetrate the full thickness of the tool body, enabling continuous long-duration uninterrupted wellbore fluid circulation and fish debris flushing cleaning operations while the lead impression block remains run into the wellbore, no repeated tripping out of the well is required to complete debris washing work and improve overall pre-workover construction efficiency.
Full Range of Interchangeable Outer Diameter Size Optional Configuration: Multiple different outer diameter OD specifications are provided for free independent selection, fully matching various wellbore inner diameter constraint conditions and different size fish junk contour sampling construction demands.
Dual Independent Working Condition Material Grade Optional Configuration: 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.
Ultra-Simplified Wellsite Operation Logic: The lead impression block 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 lead impression block down along the wellbore until the lower soft lead weight contacts the top of downhole fish junk target, apply light axial weight to complete soft lead deformation and fish outer contour imprint sampling work; the built-in circulation wash holes support continuous wellbore fluid circulation and debris flushing cleaning operations during the whole sampling process, no complex auxiliary operation steps such as drop ball delivery or shear pin impact jarring are needed, shortening wellsite operation time and reducing human error risks.
Low Routine Maintenance Design: The integral cylindrical tool body eliminates vulnerable split assembly movable friction parts; after each fish contour imprint sampling operation, only simple surface soft lead residue cleaning, circulation wash hole passage blockage flushing and retaining pin locking state visual inspection are required, no complex disassembly, internal soft lead weight replacement or spring preload adjustment maintenance procedures, greatly reducing daily maintenance labor and spare parts inventory cost.
Multi-Type Standard Thread Compatibility: All product models are equipped with universal 1"AMMT, 1-1/2"AMMT, 2-3/8"PAC and 2-3/8"REG bottom connection threads, realizing seamless assembly with global mainstream coiled tubing bottom-hole assemblies and other supporting downhole pre-workover fish sampling service 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 the main cylindrical tool body, rigid full penetration welding of the internal fixed retaining pin and tool cylinder wall, featuring outstanding circulating fluid erosion resistance, repeated axial compression load fatigue resistance and structural stability, extending long-term continuous downhole fish junk outer contour profile imprint sampling service life for coiled tubing pre-workover operations.
Application Scenarios
1. Coiled tubing downhole fish junk outer contour profile imprint sampling heavy-load intervention treatments, including all types of fallen downhole tubular fish, perforating gun assemblies, drill bit fragments and other solid fish junk outer geometric shape and dimension reference data acquisition pre-workover construction operations
2. Conventional sweet crude oilfield integral cylindrical soft lead sampling lead impression block downhole fish junk contour imprint sampling pre-workover fishing tool selection service (STD Standard carbon steel working condition grade)
3. High-sulfur H₂S containing corrosive downhole wellbore construction project downhole fish junk outer contour imprint sampling heavy workover projects requiring H₂S sour service anti-sulfide stress cracking high-corrosion-resistant alloy material grade
4. Long-term continuous repeated axial compression load safety protection for coiled tubing bottom-hole assemblies in onshore and offshore oilfield downhole fish junk outer contour profile imprint sampling pre-workover intervention projects
Standard Delivery Package
Complete lead impression block integral cylindrical pre-assembled unit including main tool cylinder body, internal fixed anti-drop retaining pin and bottom-mounted malleable soft lead weight sampling assembly
Spare interchangeable malleable soft lead weight maintenance kit with multiple thickness specifications for on-site sampling depth adjustment or worn soft lead weight replacement
Full factory inspection test report including repeated axial compression load fatigue resistance test, integral tensile load test, internal retaining pin anti-drop locking stability calibration test and soft lead weight fish contour imprint geometric copying reliability performance test data
Product dimension drawing and official installation & operation instruction manual, with detailed on-site downhole fish junk outer contour profile imprint sampling 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
Quality Warranty & After-Sales Service
Warranty Coverage: 12 months after factory shipment or 2000 cumulative axial compression load cycles, whichever condition is reached first
Full factory inspection: Each finished lead impression block passes integral tensile load test, repeated axial compression load fatigue test, internal retaining pin anti-drop locking stability calibration test and soft lead weight fish contour imprint geometric copying reliability performance test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing downhole fish junk outer contour imprint sampling pre-workover tool string matching, outer diameter & working condition grade (STD / H₂S) selection consultation free of charge
Long-term spare parts supply: All interchangeable malleable soft lead weight wear accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom outer diameters, customized soft lead weight thickness specifications, base material corrosion resistance grade modification, bottom thread profiles and special size lead impression blocks based on customer technical drawings
FAQ
Q1: What is the core function of a Lead Impression Block?
The Lead Impression Block is a bottom-mounted malleable soft lead downhole fish outer contour profile imprint sampling mold tool dedicated to coiled tubing downhole pre-workover fish junk contour sampling and matched fishing tool selection operations. It adopts bottom soft lead weight assembly design, malleable soft lead material deforms under axial tool weight to accurately copy the precise top outer contour geometric outline of downhole fish junk target, providing reliable accurate dimensional and shape reference data for field engineers to select corresponding matched fishing salvage tools, avoiding fishing tool mismatching failure risks. A built-in fixed retaining pin mechanical limit barrier is installed below the soft lead weight to lock the soft lead block and eliminate the risk of soft lead falling off during wellbore running-in or tripping-out operations. Integrated through-type circulation wash holes penetrate the tool body, enabling continuous wellbore fluid circulation and fish debris flushing cleaning operations while the lead impression block remains run into the wellbore, no repeated tripping out of the well required for debris washing work. 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 pre-workover contour imprint sampling of all types of fallen downhole tubular fish, perforating gun assemblies, drill bit fragments and other solid fish junk to select matched fishing salvage tools.
Q2: What three core structural advantages does this Lead Impression Block own?
1. Bottom-mounted malleable soft lead weight sampling design, soft lead malleable weight assembly is installed at the lower end of the impression block, under axial tool weight the soft lead can fully deform and accurately copy the precise top outer contour geometric outline of downhole fish junk target, providing reliable accurate dimensional and shape reference data for field engineers to select corresponding matched fishing salvage tools, avoiding fishing tool mismatching failure risks; 2. Built-in anti-drop fixed retaining pin mechanical limit structure, a fixed stop pin is rigidly mounted directly below the soft lead weight assembly, the pin forms a physical limit barrier to lock the soft lead block assembly in position, completely eliminating the risk of malleable soft lead loosening, shifting and falling off during wellbore running-in or tripping-out operations, ensuring sampling integrity; 3. Integrated through-type circulation wash hole layout & ultra-simplified wellsite operation logic, independent dedicated fluid circulation flushing passages penetrate the full thickness of the tool body, enabling continuous long-duration uninterrupted wellbore fluid circulation and fish debris flushing cleaning operations while the lead impression block remains run into the wellbore, no repeated tripping out of the well is required to complete debris washing work and improve overall pre-workover construction efficiency; the lead impression block has no complex internal movable friction components, spring energy storage assemblies or differential pressure release mechanisms, only need to run the lead impression block down along the wellbore until the lower soft lead weight contacts the top of downhole fish junk target, apply light axial weight to complete soft lead deformation and fish contour imprint sampling work, and the built-in circulation wash holes support continuous wellbore fluid circulation and debris flushing cleaning operations during the whole sampling process, 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 Lead Impression Blocks support?
Our standard production lineup fully covers outer diameters: 2.3", 3", 3.7" and 4". 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"AMMT, 1-1/2"AMMT, 2-3/8"PAC and 2-3/8"REG bottom connection threads compatible with global mainstream coiled tubing connector assemblies and other supporting downhole pre-workover fish sampling service tools. Custom soft lead weight thickness specifications and base material corrosion resistance grade specifications are available upon customer downhole wellbore fluid H₂S concentration corrosive environment 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 lead impression blocks with special outer diameters or customized soft lead weight thickness specifications & 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 lead impression blocks, 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 axial compression load fatigue, internal retaining pin anti-drop locking stability calibration and soft lead weight fish contour imprint geometric copying 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), 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 downhole fish junk outer contour profile imprint sampling 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) during order placement.
