Downhole Wireline Cutting Tool Mechanical Severing

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Solution Overview

Problem

Existing methods for severing wirelines in downhole operations are either inefficient, unpredictable, or cause damage to tools and wellbores, particularly when relying on points of weakness or explosive charges.

Innovation Solution

A wireline cutting tool comprising an upper and lower tubular sub, a knife housing, a plunger, and an electrical connection assembly, which uses a two-step shear mechanism to cleanly sever the wireline, ensuring predictability and minimizing damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a point of weakness or explosive charge is used to sever the wireline, then the wireline can be cut, but the cutting process becomes unpredictable and may cause damage to tools and wellbores

Engineering Contradiction:

Improvewireline severing efficiencyVSAvoidcutting predictability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces explosive charges with a mechanical cutting system consisting of a cutting wheel driven by a motor. This mechanical system provides predictable, controlled cutting action through direct mechanical engagement of the cutting wheel with the wireline, eliminating the unpredictability of explosive severing while maintaining cutting efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a controlled weak point in the wireline assembly that allows for predictable failure at a specific location. This intermediary weak point mechanism ensures the wireline severs at the intended position rather than at an unpredictable location, improving both reliability and control of the cutting process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If a point of weakness is used to sever the wireline, then the wireline can be cut, but damage is caused to tools and wellbores

Engineering Contradiction:

Improvewireline severing capabilityVSAvoiddamage to tools and wellbores

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces explosive charges with a mechanical cutting wheel system that cuts the wireline through controlled mechanical engagement. This substitution eliminates the harmful shock waves and uncontrolled force distribution associated with explosives, preventing damage to the wellbore and downhole tools while maintaining wireline severing capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent positions the cutting tool and wireline severing mechanism to absorb and contain the cutting forces within the tool assembly itself. The tool structure is designed to cushion and distribute the stresses of wireline severing, preventing harmful transmission of forces to the wellbore and surrounding tools.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of operation

If the wireline is severed using existing methods, then the wireline can be removed, but the process is inefficient and may require re-drilling

Engineering Contradiction:

Improvewireline removal processVSAvoidoperational efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent incorporates a wireline cutting tool that is deployed ahead of or with the logging tool assembly. This preliminary positioning allows the wireline to be severed at the optimal location before the tool assembly needs to be retrieved, enabling efficient wireline removal without requiring tool retrieval or re-drilling operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the wireline cutting function from separate operations and integrates it directly into the logging tool assembly. This extraction and integration allows the wireline to be severed and removed as a standalone operation, improving efficiency by eliminating the need to retrieve the entire tool assembly or perform re-drilling.

Inventive Principle:

Principle #2Taking out (Extraction)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The tool effectively severs the wireline in a clean and efficient manner, allowing for the safe removal of the wireline while leaving the downhole tool in place, thus preventing loss and reducing the need for re-drilling.

Implementation Method 1

uses a two-step shear mechanism to cleanly sever the wireline

Methodology Applied

Scientific EffectShear mechanism: Shear Stress

Data Source

PatentUS12203331B2Electrical connection assembly for downhole wireline

Publication Date: 2025.01.21 RASMUSSEN JON RANDALL

AI summary

An electrical connection assembly for a wireline cutting tool. The electrical connection assembly comprises an electrical connection sub having an upstream end and a downstream end. A pin connector resides within a bore of the electrical connection sub, with the pin connector having a conductive pin. The electrical connection assembly also includes a signal line connector. The signal line connector extends from an upstream end of the electrical connection sub and is in electrical communication with an electric wireline within a wellbore. The signal line connector places the electric wireline in electrical communication with a signal line further downhole. The signal line is associated with a downhole tool. A downstream end of the conductive pin is connected to the signal line. The electrical connection assembly also includes a spring that is wound around the pin and which biases the conductive pin out of a bore of the downstream end of the electrical connection sub.