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Lifting Sub

A short drillstring component that is temporarily connected to the top of a tool assembly that is to be lifted vertically, such as when running or retrieving a tool string. The external profile on the upper section of the lifting sub is similar to that of the completion tubing, enabling the rig elevators to lift the assembled tool string safely.

Classification:

Rate of Penetration Ehancement Tools

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Detailed Description

Product Overview

The Lifting Sub resembles a Pup Joint and is engineered for lifting operations of drilling tools. By connecting to the upper end of the drill string, it enables safe hoisting and lowering of the drill string via an Elevator . Its structure is similar to Completion Tubing , allowing efficient integration with drill pipe elevators to ensure stable handling of drilling tools.

Application

Oil & Gas Drilling Operations

On both land rigs and offshore platforms , the lifting sub facilitates the hoisting and lowering of drill strings during tripping in/out operations. It ensures stability when connected to elevators, maintaining drilling efficiency and safety in demanding environments.

Geological Exploration Drilling

Used for lifting exploration tools in complex formations, it guarantees secure handling to obtain accurate geological data while minimizing operational risks.

Features & Advantages

1. High Strength & Durability

Constructed from premium alloy steel (e.g., AISI 4145HM, yield strength ≥862 MPa), it withstands tensile forces, pressure, and torque in harsh downhole conditions, significantly reducing fatigue failure risks.

2. Secure Connection & Efficient Handling

Precision-machined internal threads and slips ensure rapid, stable connections, enabling uniform force transmission and preventing tool slippage or disengagement accidents.

3. Broad Compatibility

Compatible with diverse drill pipe elevators and drilling equipment, adapting to various tool sizes (e.g., API Reg/NC threads) to enhance operational flexibility and efficiency.

4. Superior Sealing Performance

An efficient sealing system blocks ingress of downhole fluids and contaminants, protecting internal mechanisms and extending service life while reducing maintenance frequency.

5. Ease of Operation

Smooth surfaces and ergonomic design simplify installation/removal, reducing labor intensity and boosting operational efficiency by ≥25% in field trials.

Lifting Cap

Cutting Bed Impeller