Adjustable Inner Gauge Drill Bit for Wellbore Stability

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Solution Overview

Problem

Conventional drill bits face challenges in adjusting gauge pad contact with the wellbore diameter, limiting steerability and stability due to fixed gauge element placement on the outer surface, which restricts axial movement and increases the complexity of directional control during drilling operations.

Innovation Solution

The introduction of a positionally adjustable inner gauge pad within the drill bit's central bore allows for axial movement, increasing or decreasing the exposed bore surface area to enhance steerability and stability by dynamically adjusting the contact with the wellbore, thereby improving directional control and reducing vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If gauge pads are fixed on the outer surface of the drill bit, then structural simplicity is maintained, but steerability and stability are limited due to inability to adjust gauge pad contact with the wellbore diameter

Engineering Contradiction:

ImprovesteerabilityVSAvoidgauge pad configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The gauge pad is made movable within the drill bit structure, transitioning from a fixed configuration to a dynamic one. The pad can be positioned at multiple locations along the central bore axis and radially adjusted to contact the wellbore wall at different points, enabling real-time adaptation of steerability and stability characteristics during drilling operations.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The gauge pad is nested within the central bore of the drill bit, allowing it to be housed inside the drill bit structure while still functioning at the wellbore interface. This nested configuration enables the pad to move axially and radially within the bore space without increasing the external dimensions of the drill bit.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of operation

If gauge pads are fixed on the outer surface of the drill bit, then ease of operation is maintained, but directional control complexity increases due to limited adjustability

Engineering Contradiction:

Improvedirectional controlVSAvoidgauge pad positioning

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The gauge pad positioning system is designed to be dynamically adjustable during drilling operations. The pad can be moved to different axial positions along the central bore and radially positioned to contact the wellbore wall, providing operators with flexible directional control capabilities without requiring complex external positioning mechanisms.

Inventive Principle:

Principle #15Dynamics

3Stability of the object's composition

If gauge pads are fixed on the outer surface of the drill bit, then structural simplicity is maintained, but stability is reduced due to restricted axial movement capability

Engineering Contradiction:

Improvedrill bit stabilityVSAvoidgauge pad configuration

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The gauge pad is configured with axial movement capability along the central bore, allowing it to dynamically adjust its position to maintain optimal contact with the wellbore wall. This axial adjustability enables the pad to compensate for variations in wellbore diameter and drilling conditions, thereby enhancing drill bit stability during operation.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If gauge pads are fixed on the outer surface of the drill bit, then manufacturing simplicity is maintained, but steerability control is limited due to fixed gauge element placement

Engineering Contradiction:

Improvesteerability controlVSAvoidgauge pad configuration

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The gauge pad is nested within the central bore structure, utilizing the internal space of the drill bit for pad positioning mechanisms. This nested arrangement allows for multiple adjustment positions and movement capabilities while maintaining a relatively simple overall manufacturing process, as the pad and its mechanisms are integrated within the existing bore geometry.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS11293232B2Drill bit with adjustable inner gauge configuration

Publication Date: 2022.04.05 HALLIBURTON ENERGY SERVICES INC

AI summary

A drill bit can include a bit body having an upper portion, a central bore, and an adjustable inner gauge. The central bore can define a bore surface, and the bit body can include a plurality of fixed cutters formed on the upper portion. The adjustable inner gauge may be movably positioned within the bit body central bore to increase or decrease an exposed area of the bore surface for adjusting stability or steerability of the drill bit while forming the wellbore.