Downhole Cutting Tool Anchor Arrangement for Vibration Control

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Solution Overview

Problem

Conventional downhole cutting tools experience bending forces and vibrations during cutting operations due to the placement of anchoring members only upstream of the cutting member, leading to reduced accuracy and increased load on the tool head.

Innovation Solution

A downhole cutting tool design featuring a tool head assembly with a cutting member housed in a tubular body, a first stabilizing anchor downstream of the cutting member, and a second stabilizing anchor upstream, along with a locating anchor, which allows for simultaneous activation and deactivation of the anchors to maintain the cutting member's position and reduce bending forces and vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If all anchoring members are located upstream of the cutting member, then the tool structure is simplified and easier to manufacture, but the cutting member is subject to bending forces and vibrations during cutting operations

Engineering Contradiction:

Improvetool structure simplicityVSAvoidcutting member stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The anchoring system is segmented into multiple independent anchors (upstream anchor and downstream anchor) positioned at different locations along the tool head assembly. This segmentation allows each anchor to independently stabilize different portions of the cutting member, reducing overall bending forces and vibrations while maintaining structural simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The anchoring arrangement transitions from a one-dimensional upstream-only configuration to a two-dimensional distribution along the longitudinal axis of the tool head, with anchors positioned both upstream and downstream of the cutting member. This dimensional change provides balanced support and eliminates the bending moment issue while preserving manufacturing simplicity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If the cutting member is located on the free end of the tool head, then the tool design is simpler, but accuracy of the cut is reduced due to misalignment from bending forces

Engineering Contradiction:

Improvetool head design complexityVSAvoidcutting accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The downstream anchor acts as a counterbalancing element that provides support opposite to the upstream anchor, creating a balanced force distribution system. This counterbalancing arrangement eliminates the bending forces that would otherwise cause misalignment and reduce cutting accuracy, while keeping the tool head design relatively simple

Inventive Principle:

Principle #8Anti-weight (Counterweight)

3Stability of the object's composition

If anchoring members are positioned close to the cutting member, then displacement of the tool head is reduced, but the load on the tool head increases

Engineering Contradiction:

Improvetool head displacement controlVSAvoidload on tool head

Core Design Contradiction:

Stability of the object's compositionVSForce

Solution Approach 1:

Different anchors are positioned at different locations (upstream and downstream) to provide localized support at specific points along the tool head assembly. This local quality approach allows each anchor to independently control displacement in its vicinity while distributing the overall load across multiple support points, preventing excessive concentration of force

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11047184B2Downhole cutting tool and anchor arrangement

Publication Date: 2021.06.29 HALLIBURTON ENERGY SERVICES INC

AI summary

A downhole cutting tool is operable, when deployed, to create a cut through a wall of a tubular member, for example a downhole casing, tubing or drill pipe. The downhole cutting tool comprises a tool head assembly, comprising a tubular body, which provides a housing, which houses a cutting member, a first anchor located downstream of the cutting member and a second anchor member located upstream of the cutting member.