Downhole Cutting Tool Helical Activation

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Solution Overview

Problem

Current methods for perforating downhole well conduits are either uncontrolled and unreliable, requiring explosive charges or time-consuming mechanical processes, and lack efficient means for isolating and sealing perforated sections for hydraulic fracturing or remedial cement operations.

Innovation Solution

A downhole tubular cutting tool with radially moveable cutting members activated by mechanical means, utilizing a helical profiled member rotated via drill string torque to create controlled cuts and anchor mechanisms for secure positioning, including hydraulic or mechanical seals for isolation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If explosive charges are used for perforation, then perforation can be achieved, but the process is uncontrolled and unreliable

Engineering Contradiction:

Improveperforation reliabilityVSAvoidperforation control precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent replaces the chemical explosive system with a mechanical cutting system. A rotatable cutting member with cutting edges mechanically cuts through the well conduit wall under rotational motion, providing controlled and reliable perforation without the unpredictability of explosive charges.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cutting member is designed to rotate during operation, transforming from a static to a dynamic system. This rotation enables continuous cutting action along the conduit wall, allowing controlled perforation at multiple positions while maintaining reliability through consistent mechanical engagement.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If mechanical section milling is used to access B-annulus, then access can be gained, but the process is time-consuming

Engineering Contradiction:

Improveaccess to B-annulusVSAvoidoperation speed

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The cutting tool is designed with multi-functionality to perform both perforation of the conduit wall and creation of access channels to the B-annulus. This single tool accomplishes multiple tasks that previously required separate operations, significantly improving productivity while maintaining ease of operation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The rotating cutting member continuously cuts through the conduit wall and creates access channels in a single continuous operation rather than through multiple discrete steps. This continuous cutting action eliminates idle time between operations and maintains productive work throughout the entire process.

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If multiple single penetrations are made via hydraulic pistons, then perforation can be achieved, but the device complexity increases

Engineering Contradiction:

Improveperforation reliabilityVSAvoidactivation mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the complex hydraulic piston activation system and replaces it with a simpler rotational activation mechanism. The cutting member is directly rotated by the drive shaft, eliminating the need for intermediate hydraulic components and reducing overall device complexity while maintaining reliable perforation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The hydraulic activation system is replaced with a direct mechanical rotation system. The drive shaft directly rotates the cutting member, substituting complex fluid-powered pistons with a simpler mechanical transmission system that achieves the same perforation reliability with fewer components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables precise and repeatable perforation of downhole tubulars without explosives, facilitating efficient hydraulic fracturing and cement operations by creating controlled cuts and maintaining mechanical barriers for isolation, thus improving the reliability and speed of well completion and abandonment processes.

Implementation Method 1

the member may provide mechanical means of activation that may be generated from a helical member rotated via drill string torque, and the rotational movement may move an activation member axially down the helical profiled member

Methodology Applied

Scientific EffectHelical mechanism: Helix

Implementation Method 2

A downhole cutting tool for creating cuts in the wellbore conduit... with at least one cutting member moveable radially outward

Methodology Applied

Scientific EffectAbrasion: Abrasion

Data Source

PatentUS12071834B2Downhole cutting tool

Publication Date: 2024.08.27 CORETRAX GLOBAL LTD

AI summary

A downhole cutting tool (13) for perforating a tubular (14) in an oil or gas well comprises a body (4); radially moveable cutting members (3) mounted on the body (4); a helical profiled member (1) rotatable relative to the body (4); and activation members (2) axially movable relative to the body (4). Rotation of the helical profiled member (1) generates axial movement of the activation members (2), and the activation members (2) configured to actuate the cutting members (3) from a retracted configuration to an extended configuration.