Overshot

Technical Specifications

Key Features

1.Full Size Range Coverage for Multi-Well Fishing Applications

The series covers bowl outer diameters from 4" to 12-3/4" (models LT-T102 to LT-T324), adapting to fishing operations in small-diameter exploration wells and large-diameter oil and gas wells, meeting the construction needs of various wellbore specifications.

2.Dual Grapple Options for Versatile Fish Structures

Each model supports both spiral grapple and basket grapple configurations. The spiral grapple is ideal for smooth tubular fish with a larger catch size, while the basket grapple provides even gripping for pipe with couplings or shoulders, offering enhanced adaptability.

3.API Standard Connections for Universal On-Site Compatibility

Equipped with industry-standard API threads including 6-5/8REG, NC50, NC38, and NC26, the overshot connects directly to standard drill pipes, collars, and jars without crossover subs, significantly improving assembly efficiency.

4.Circulation Capability for High-Pressure Washing and Stuck Release

Built-in seals allow continuous drilling fluid circulation at high pump pressures after engaging the fish, facilitating fish top washing and circulation establishment to support subsequent stuck-release operations.

5.Releasing Design for Enhanced Safety and Risk Mitigation

If the fish cannot be freed after engagement, the overshot can be safely released and the drill string tripped out, preventing further downhole complications and reducing operational risks.

6.Integrated Milling Shoe to Improve Fishing Success Rate

The bottom guide/milling shoe trims irregular fish tops and removes burrs, guiding the fish smoothly into the bowl and greatly improving the success rate in complex fishing conditions.

7.Jar Compatibility for Effective Stuck Fish Recovery

Designed to work with both upward and downward jars to deliver impact loads and free stuck fish, making it suitable for challenging scenarios such as sand stuck and differential pressure stuck pipe.

8.High-Strength Bowl Construction for Durable Downhole Performance

Manufactured from high-strength alloy steel, the bowl offers excellent torsion and compression resistance. It withstands complex downhole stresses and heavy loads without deformation, ensuring long service life.

9.Modular Design for Easy Maintenance and Replacement

Key components such as grapples, seals, and milling shoes are individually replaceable without full disassembly, reducing maintenance costs and on-site downtime.

10.Multi-Application Versatility for All Tubular Fish Types

It recovers a wide range of downhole tubular fish including drill collars, drill pipes, tubing, and couplings. Widely used in conventional drilling, directional wells, and workover operations, it is a universal core tool for oilfield fishing operations.

FAQ

Q: What are the main types of your downhole fishing tools?

A: Our product line mainly includes external fishing overshots, internal fishing spears and junk fishing tools. The overshot series contains releasing and circulating overshot, short catch overshot, sucker rod overshot; the spear series covers releasing spear, back off spear, sliding block spear and casing spear; junk tools include junk basket and drilling junk cup.

Q: What is the difference between overshot and spear?

A: Overshot is an external fishing tool that grips the outer diameter of tubular fish. Spear is an internal fishing tool that latches onto the inner bore of hollow tubulars. They are applied to different fishing conditions respectively.

Q: What fish can the releasing and circulating overshot retrieve?

A: It is designed for tubular fish such as drill collars, drill pipes, tubing and couplings, widely used for pipe string recovery in drilling and workover operations.

Q: Are there different grapple types for overshot?

A: Yes. Each model is equipped with spiral grapple and basket grapple for options. Spiral grapple fits plain tubulars with larger catch size, while basket grapple works better for pipes with couplings or shoulders.

Q: What specifications are available for releasing and circulating overshot?

A: The models range from LT-T102 to LT-T324, with bowl outer diameter from 4" to 12-3/4". Standard connections include 6-5/8REG, NC50, NC38 and NC26.

Q: Why is the overshot called releasing type?

A: If the caught fish cannot be freed from sticking, the overshot can be released from the fish. The drill string can be pulled out safely to avoid worsening downhole accidents.

Q: Can the overshot circulate drilling fluid after catching fish?

A: Yes. Built-in sealing structure allows high-pressure circulation of drilling fluid after fishing, which helps wash fish top and release stuck pipe.

Q: What is the function of the milling shoe at the bottom of overshot?

A: The milling shoe trims irregular fish tops and removes burrs. It guides the fish into the bowl smoothly and improves fishing success rate.

Q: What is the short catch overshot used for?

A: It is specially developed for fish with short exposed length. It can work normally when the exposed fish top is only 50mm, ideal for special short fish top conditions.

Q: What is the sucker rod overshot for?

A: It is a dedicated tool for retrieving sucker rods. It features compact structure and strong versatility, commonly used in well workover operations.

Q: What working conditions does the back off spear adapt to?

A: It integrates fishing and back off functions. It can catch hollow tubulars and transmit left-hand torque to unscrew stuck pipe strings.

Q: What are the advantages of sliding block spear?

A: It has simple structure and easy operation. It can retrieve drill pipes, tubing, screens and downhole tools, and can be matched with jars and back off tools.

Q: What is the application of casing spear?

A: It is a special internal fishing tool for casings. With large contact area of slips, it can lift or jar stuck casings efficiently.

Q: What tools are used to recover small metal junk in the well?

A: Junk basket and drilling junk cup are adopted. The junk basket collects bit cones, tooth blocks and scrap iron via reverse circulation; the junk cup gathers metal cuttings and heavy debris.

Q: Are all connections of fishing tools API standard threads?

A: Yes. All products adopt standard API threads such as REG, NC and special rod threads, which are universally compatible with conventional drill strings.

Q: Can these fishing tools work with jars?

A: Most of our overshots and spears can be combined with jars. The impact force helps release stuck fish in complex downhole conditions.

Q: What industries are these fishing tools mainly applied to?

A: They are widely used in oil & gas drilling, well workover, geological exploration, geothermal development, water well engineering and mining engineering.

Q: Do you provide products for onshore and offshore oilfields?

A: Yes. The full product range is suitable for both onshore and offshore operations, including vertical wells, directional wells, horizontal wells and deep wells.

Q: Are key parts of fishing tools replaceable?

A: Yes. Grapples, slips, sealing components and milling shoes are modular and individually replaceable, which lowers maintenance cost.

Q: Can you provide customized fishing tools?

A: We supply complete standard specifications. Meanwhile, we can customize special sizes, threads and structures according to customers' actual well conditions.