Roller Cone Rock Bit Nozzle Configuration for Cleaning and Erosion Control

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Solution Overview

Problem

Conventional roller cone rock bits face challenges with bit balling and cone erosion due to inadequate cleaning of cutting elements, particularly in harder formations, leading to reduced rate of penetration and premature wear.

Innovation Solution

The design incorporates a novel nozzle configuration with intermediate and outer sleeve receptacles positioned between cone axes, directing drilling fluid to intermeshing cutting elements to enhance cleaning while minimizing cone shell impingement, using diffuser nozzles to reduce erosion and increase cleaning efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional nozzle arrangements are used, then drilling fluid is directed at cone shells, but this causes excessive cone erosion and premature loss of cutting elements

Engineering Contradiction:

Improvenozzle arrangement simplicityVSAvoidcone shell erosion

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The bit body is divided into distinct regions (central dome region, intermediate dome region, outer dome region) with different nozzle arrangements in each zone. This segmentation allows optimized fluid direction for each area, directing drilling fluid away from cone shells in the central region while providing cleaning in outer regions without causing erosion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different nozzle configurations are applied to different locations on the bit body. The central dome region uses a first nozzle arrangement, the intermediate dome region uses a second arrangement, and the outer dome region uses a third arrangement. Each local configuration is optimized for its specific function, preventing cone erosion where cutting elements are mounted while maintaining cleaning effectiveness.

Inventive Principle:

Principle #3Local quality

2Productivity

If drilling fluid flow is increased to clean cutting elements, then cutting element cleaning improves, but cone shell impingement and erosion increase

Engineering Contradiction:

Improvecutting element cleaning efficiencyVSAvoidcone shell impingement

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The nozzle arrangements are positioned in the dome regions above the cones rather than directly adjacent to them. This spatial repositioning in the vertical dimension allows drilling fluid to be directed downward onto the formation and cutting elements without directly impinging on the cone shells, separating the cleaning function from the harmful impingement effect.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The drilling fluid acts as an intermediary medium that transfers cleaning action from the nozzles to the cutting elements without directly contacting the cone shells. The fluid flow path is routed through the intermediate dome region where it cleans cutting elements while the cone shells remain protected from direct impingement.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If additional nozzles are added to improve cleaning, then cutting structure cleaning enhances, but device complexity increases

Engineering Contradiction:

Improvecutting structure cleaningVSAvoidnozzle configuration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The nozzle arrangements in the dome regions serve multiple functions simultaneously: they direct drilling fluid onto the formation to enhance cutting, clean cutting elements on the cones, and protect cone shells from erosion. This multi-functionality achieves improved cleaning without proportionally increasing complexity, as a single nozzle arrangement performs several beneficial roles.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This configuration improves cutting element cleaning, reduces cone shell erosion, and enhances the rate of penetration and durability of the drill bit by optimizing drilling fluid flow and distribution.

Implementation Method 1

directing drilling fluid to intermeshing cutting elements

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

using diffuser nozzles to reduce erosion and increase cleaning efficiency

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS7913778B2Rock bit with hydraulic configuration

Publication Date: 2011.03.29 SMITH INTERNATIONAL INC

AI summary

A drill bit for drilling through an earthen formation to form a borehole with a radius R. In an embodiment, the drill bit comprises a bit body having a central bit axis and including a pin end, an internal plenum, and a dome side. The dome side includes a central dome region extending from the bit axis to about 10% of the radius R and an intermediate dome region extending from the central region to about 50% of the radius R. In addition, the drill bit comprises an intermediate receptacle having a central axis and extending through the intermediate dome region. Further, the drill bit comprises a first and a second rolling cone, each including an intermediate cone region. A projection of the central axis of the intermediate receptacle passes between the intermediate regions of the first cone and the second cone.