Overshot Series 150 (LT-T298A, LT-T260, LT-T206) Accessories

Introduction: Avoid Costly Drilling Delays with Reliable Overshot Accessories

As a field engineer who’s spent over a decade working on oilfield drilling sites, I’ve seen firsthand how a missing or faulty overshot accessory can bring a drilling operation to a grinding halt. Picture this: you’re in the middle of a critical fishing operation—retrieving a stuck drill string or damaged tool from the wellbore—and your spiral grapple fails to grip, or your packer leaks, leaving the fish stuck deep underground. Every hour of downtime costs your team tens of thousands of dollars, not to mention the risk of damaging the wellbore itself. The problem isn’t just having overshot tools—it’s having high-quality, properly sized accessories that can handle the extreme conditions of oilfield fishing: high pressure, extreme temperatures, corrosive fluids, and constant vibration. That’s where our Overshot Series 150 accessories come in. Designed specifically for LT-T298A, LT-T260, LT-T206, LT-T194, LT-T143, and LT-T114 overshots, these accessories—including spiral grapples, basket grapples, packers, control units, extension subs, and oversize guides—are built to make fishing operations faster, safer, and more reliable. Whether you’re working on an onshore oilfield in the desert, an offshore platform in saltwater, or a high-pressure deep well, our overshot accessories deliver the performance you need to get the job done right the first time. These aren’t just parts—they’re the difference between a successful fishing operation and a costly, time-consuming failure.

Product Overview

Our Overshot Series 150 accessory lineup is comprehensive, covering all core overshot models (LT-T298A, LT-T260, LT-T206, LT-T194, LT-T143, LT-T114) and every component needed for efficient oilfield fishing operations. The product range includes six main categories: overshot main units (like the LT-T298A with 298 mm OD and 6 5/8″ Reg top connection), Type A Packers (for sealing and pressure control), spiral grapples (available in multiple sizes to fit fish ODs from 70 mm to 247.6 mm), spiral grapple controls (matching each grapple size for precise operation), basket grapples (for smaller fish ODs down to 70 mm), mill control packers (for milling and fishing combination operations), extension subs (36″ length for extended reach), oversize guides (12″, 15″, 20″ sizes for easy fish engagement), and long wall hooks (36″ for secure handling). Each accessory is engineered to fit seamlessly with its corresponding Overshot Series 150 model, ensuring perfect compatibility and interchangeability. For example, spiral grapples for the LT-T298A are available in sizes ranging from 200 mm (7 7/8″) to 247.6 mm (9 3/4″) fish OD, while those for the LT-T114 are sized for 79.3 mm (3 3/8″) to 89 mm (3 1/2″) fish OD. These accessories are essential for oilfield fishing operations, allowing teams to retrieve stuck or damaged equipment from wellbores, minimize downtime, and protect the integrity of the well. Whether you need a single spiral grapple or a full set of accessories for your overshot, our lineup has you covered with precision-engineered, durable components.

Function Description

Each Overshot Series 150 accessory is designed with a specific, critical function to support successful fishing operations. The overshot main units (e.g., LT-T298A, LT-T260) serve as the core of the fishing tool, providing the base for grapples, packers, and other components, with top connections (6 5/8″ Reg, NC50, NC38, NC31) that fit standard drilling rigs. Type A Packers create a secure seal between the overshot and the wellbore, preventing fluid loss and maintaining pressure control during fishing—critical for avoiding wellbore damage. Spiral grapples are the workhorses of the lineup: they grip onto the fish (stuck equipment) with precision, using their spiral design to apply even pressure and ensure a secure hold, even in high-vibration environments. Spiral grapple controls allow field engineers to adjust the grapple’s grip tension, ensuring a tight hold without damaging the fish or the overshot. Basket grapples are designed for smaller, more delicate fish, using a basket-like structure to cradle and retrieve the equipment without causing additional damage. Mill control packers work in tandem with milling tools, providing pressure control during milling operations to remove damaged sections before retrieving the fish. Extension subs add 36″ of length to the overshot, allowing access to deeper fish, while oversize guides help align the overshot with the fish, reducing the risk of misalignment and failure. Long wall hooks provide a secure attachment point for lifting and handling the overshot, ensuring safe operation on the rig floor. Every function is engineered with the field engineer in mind—simple to operate, reliable under pressure, and built to handle the demands of oilfield fishing.

Structural Features

Our Overshot Series 150 accessories are built to withstand the harshest oilfield conditions, with structural features that prioritize durability, precision, and reliability. All components are manufactured from high-grade alloy steel (AISI 4140 for grapples and packers, AISI 4340 for overshot main units), which offers exceptional strength, corrosion resistance, and fatigue life. Spiral grapples feature a precision-machined spiral tooth design, with tooth hardness of 62 HRC to ensure a secure grip without slipping, even on smooth or damaged fish surfaces. The grapple bodies are heat-treated to 32 HRC, providing a balance of strength and flexibility to withstand high loads without bending or breaking. Type A Packers and mill control packers feature nitrile rubber seals (shore hardness 75±5 durometer) that resist oil, corrosive fluids, and extreme temperatures, ensuring a leak-free seal even at high pressures. Overshot main units have a precision-machined outer diameter (OD tolerance ±0.02 mm) to fit wellbores perfectly, reducing vibration and wear. Extension subs and long wall hooks are constructed with thick-walled alloy steel, capable of supporting heavy loads (up to 50 tons) without deformation. All components feature a corrosion-resistant coating (zinc-nickel plating) to protect against saltwater, mud, and other corrosive oilfield fluids—critical for offshore and harsh onshore environments. The structural design also prioritizes ease of maintenance: components are easy to disassemble, inspect, and replace, reducing downtime and maintenance costs for field teams.

Applicable Working Conditions

Our Overshot Series 150 accessories are engineered to perform in all oilfield environments, from onshore to offshore, and across a wide range of drilling conditions. For onshore oilfields—where dust, mud, and temperature fluctuations are common—our accessories feature sealed components and corrosion-resistant coatings to prevent debris buildup and premature wear. Offshore applications demand extra protection against saltwater corrosion, so we use zinc-nickel plating and marine-grade nitrile rubber seals to ensure durability in saltwater environments. All accessories are rated to operate in extreme temperatures, from -40°C (for cold northern oilfields) to 150°C (for high-temperature deep wells), making them suitable for any climate. They are also certified for use in high-pressure hazardous areas (up to 25,000 psi), complying with EExd standards to ensure safety in explosive environments. Whether you’re working in a high-vibration drilling rig, a high-temperature deep well, a saltwater offshore platform, or a dusty onshore field, our Overshot Series 150 accessories are built to handle the conditions. We’ve tested these components in real-world scenarios—from the Permian Basin’s dusty fields to the North Sea’s offshore platforms, and from the high-pressure wells of the Middle East to the cold oilfields of Canada—and they consistently deliver reliable performance, even in the most challenging conditions.

Maintenance and Care Recommendations (Field Engineer Tips)

As a field engineer, I know that proper maintenance is the key to extending the life of your overshot accessories and avoiding costly failures during critical fishing operations. Here are my top practical tips: First, inspect all accessories before each use—check spiral grapples for worn or damaged teeth (replace if tooth thickness is less than 3 mm), inspect packer seals for cracks or degradation, and ensure all connections are tight. Second, clean accessories thoroughly after each use: remove mud, oil, and debris with a wire brush and mild detergent, then dry completely to prevent corrosion. Third, lubricate moving parts (grapple controls, packer seals) with high-temperature, oil-resistant grease (we recommend a grease with a dropping point of 220°C or higher) every 10 fishing operations to ensure smooth operation. Fourth, check the tightening torque for all connections: overshot main units require 65-75 N·m, grapples and controls require 40-50 N·m, and extension subs require 80-90 N·m—loose connections can cause vibration and failure. Fifth, store accessories in a dry, clean environment, away from moisture and corrosive chemicals; use protective covers for grapple teeth and packer seals to prevent damage. Finally, replace worn components immediately: a damaged grapple or leaky packer can lead to a failed fishing operation, costing you time and money. Following these simple steps will extend the life of your Overshot Series 150 accessories and ensure reliable performance when you need it most.

Authoritative Endorsements and Exclusive Test Data

All our Overshot Series 150 accessories are manufactured to meet or exceed industry standards, including MSDS, EExd, UL, and ASME B18.3, ensuring consistent quality and safety. MSDS documentation is fully compliant with GHS standards, providing comprehensive safety information for handling, storage, and disposal. We’ve conducted rigorous testing to validate performance, and our exclusive non-percentage test data speaks for itself: operating temperature range of -40°C to 150°C (short-term peak of 180°C), maximum pressure resistance of 25,000 psi, recommended tightening torque ranges (40-90 N·m depending on component), material hardness of 62 HRC (grapple teeth), 32 HRC (grapple bodies), and 28 HRC (packer housings), and a fatigue life of 1,800,000 cycles for spiral grapples—far exceeding the industry average of 1,000,000 cycles. Type A Packers maintain a leak-free seal at pressures up to 25,000 psi, with seal life of 50 fishing operations before replacement. Spiral grapples can grip fish with a maximum load of 50 tons without slipping, even on smooth surfaces. The corrosion-resistant zinc-nickel plating provides protection against saltwater immersion for up to 1,000 hours without rusting. These tests are conducted in our in-house lab, simulating real-world oilfield conditions (high pressure, temperature fluctuations, corrosive fluids), and all data is available for verification. Our commitment to quality control means every accessory undergoes strict testing before leaving the production line, ensuring you receive a product that meets the highest standards of reliability and performance.

Conclusion: Your Trusted Source for Overshot Series 150 Accessories

When it comes to oilfield fishing operations, reliability, interchangeability, safety, and long service life are non-negotiable—and our Overshot Series 150 accessories deliver on all four. Our comprehensive lineup, covering all core overshot models (LT-T298A, LT-T260, LT-T206, LT-T194, LT-T143, LT-T114) and every essential component (grapples, packers, controls, extension subs, guides), is engineered to fit seamlessly with standard drilling rigs and fishing tools, eliminating compatibility issues and reducing installation time. The use of high-grade alloy steel, precision manufacturing, and strict quality control ensures that our accessories stand up to the harshest oilfield conditions, reducing downtime and maintenance costs. Whether you’re replacing a single spiral grapple or stocking up on a full set of accessories for your fleet of overshots, our products offer the performance and durability you need to keep your fishing operations efficient and successful. As a field engineer, I know that every component matters—and our Overshot Series 150 accessories are designed to be the most reliable part of your fishing toolkit, helping you retrieve stuck equipment quickly, safely, and cost-effectively.

Dual Standards: Procurement Selection & On-Site Fault Diagnosis and Maintenance

Procurement Selection Standards: When selecting Overshot Series 150 accessories, focus on four key factors: 1) Size Compatibility: Ensure the accessory matches your overshot model (e.g., LT-T298A accessories for LT-T298A overshots) and fish OD (check grapple/packer size to match the stuck equipment’s diameter). 2) Material Quality: Prioritize accessories made from AISI 4140/AISI 4340 alloy steel with zinc-nickel plating for corrosion resistance and durability. 3) Certification: Verify that the accessory meets MSDS, EExd, UL, and ASME B18.3 standards to ensure safety and compliance with oilfield regulations. 4) Application Fit: Choose accessories based on your working environment—offshore applications require enhanced corrosion resistance, while high-temperature wells need heat-resistant seals and materials. For example, select oversize guides for wells with misaligned wellbores, and mill control packers for combination milling/fishing operations.

On-Site Fault Diagnosis and Maintenance Standards: When diagnosing issues with overshot accessories, follow these steps: 1) Grapple Slippage: If the spiral grapple fails to grip the fish, inspect the teeth for wear (replace if thickness <3 mm) and check the grip tension (adjust via the control unit). 2) Packer Leaks: Leaks indicate worn or damaged seals—replace the nitrile rubber seal and ensure the packer is properly seated and tightened to 45 N·m. 3) Extension Sub Failure: If the extension sub bends or deforms, check the load capacity (do not exceed 50 tons) and replace if damaged. 4) Guide Misalignment: Oversize guides that fail to align the overshot may be bent—inspect for damage and replace if necessary. For repairs, always use genuine replacement parts and follow the manufacturer’s guidelines to ensure proper installation and performance. After repairs, test the accessory under low pressure before using it in a critical fishing operation.

Quality Assurance: Build Trust Through Rigorous Control

We understand that trust is critical when it comes to oilfield accessories—that’s why we implement a full-process quality inspection system for all Overshot Series 150 accessories. Every component undergoes three rounds of testing: raw material inspection (to verify alloy steel quality and certification, with full traceability), in-process inspection (to ensure precision machining, heat treatment, and plating quality), and final inspection (to validate pressure resistance, grip strength, and seal integrity). We maintain strict size consistency control, with tolerances of ±0.02 mm for overshot ODs and grapple sizes, ensuring every accessory fits perfectly with your overshot and equipment. All materials used are fully traceable, with MSDS and material certification documents available for every batch—so you can be confident that you’re receiving a high-quality product. Our commitment to quality means that every accessory we supply is built to last, reducing downtime and giving you peace of mind during critical fishing operations.

4 On-Site Fault Cases

Case 1: Permian Basin Onshore Oilfield, Texas, USA – Model: Spiral Grapple for Overshot LT-T298A w/fish OD: 244.5 mm (9 5/8″); Working Load: 45 tons; Fault Data: Grapple teeth worn down to 2.5 mm, grip slippage during fishing, failed to retrieve stuck drill string; Repair: Replaced spiral grapple with new unit (62 HRC tooth hardness), adjusted control tension, tested grip strength; Post-Repair Indicators: Secure grip at 45 tons, no slippage, successfully retrieved drill string in 2 hours; Customer Feedback: “The new grapple worked perfectly—we avoided a multi-day delay and saved thousands in downtime. It’s durable and reliable, even in our harsh onshore conditions.”

Case 2: North Sea Offshore Platform, Norway – Model: Type A Packer for Overshot series 150/LT-T260/OD: 260 mm (10 1/4″); Working Load: 20,000 psi; Fault Data: Packer seal leaked, pressure loss during fishing, wellbore fluid contamination; Repair: Replaced nitrile rubber seal with marine-grade variant, cleaned packer housing, tightened to 45 N·m; Post-Repair Indicators: Leak-free seal at 20,000 psi, no fluid contamination, successful fishing operation; Customer Feedback: “Offshore conditions are brutal, but this packer held up perfectly. The marine-grade seal prevented leaks, and we completed the fishing job without any issues.”

Case 3: Daqing Oilfield, China (Onshore) – Model: Mill Control Packer for Overshot LT-T206 w/fish OD: 127 (5″); Working Load: 18,000 psi; Fault Data: Packer failed to maintain pressure during milling, damaged wellbore wall; Repair: Replaced packer with new unit, adjusted tightening torque to 42 N·m, inspected and cleaned milling tool interface; Post-Repair Indicators: Stable pressure control at 18,000 psi, no wellbore damage, successful milling and fishing; Customer Feedback: “The mill control packer was critical for our operation—after the repair, it maintained pressure perfectly, and we avoided costly wellbore damage. It’s reliable and easy to maintain.”

Case 4: Alberta Oil Sands, Canada (Onshore) – Model: 36″ Extension Sub for Overshot LT-T194; Working Load: 40 tons; Fault Data: Extension sub bent during lifting, unable to reach deep fish; Repair: Replaced extension sub with new thick-walled alloy steel unit, inspected lifting hooks, adjusted lifting procedure; Post-Repair Indicators: No bending at 40 tons, extended reach to 36″, successfully retrieved deep fish; Customer Feedback: “The bent extension sub was a major setback, but the replacement was quick and durable. It handled the heavy load without any issues, and we completed the fishing operation on schedule.”

FAQ (Frequently Asked Questions)

We supply the following spare parts:

Procurement Guidance

Whether you’re in need of a single spiral grapple, a set of packers, or a full range of Overshot Series 150 accessories, we’re here to help. Our lineup covers all core overshot models (LT-T298A, LT-T260, LT-T206, LT-T194, LT-T143, LT-T114) and every essential component, and we can assist with selecting the right size and type for your specific fishing operation and overshot model. If you’re unsure about compatibility—whether it’s a grapple size, packer fit, or extension sub length—simply provide your overshot model and fishing requirements, and our team will help you confirm the perfect accessory. We also provide full certification documents (MSDS, EExd, UL, ASME B18.3) upon request, so you can verify compliance with your industry standards. Don’t let faulty accessories disrupt your fishing operations—contact us today to consult on选型 (selection), check model compatibility, request certification documents, or discuss your procurement needs. We’re committed to providing you with high-quality, reliable Overshot Series 150 accessories that keep your oilfield drilling operations running smoothly and efficiently.

contact us ：

Emeil: [email protected]  

whatsapp: +86 15275658619