Bidirectional Stabilizer for Wellbore Smoothing and Drilling Fluid Flow

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Solution Overview

Problem

Current stabilizers for drill strings do not effectively smooth and improve the quality of wellbores bidirectionally, leading to issues like wellbore diameter drift, increased trips, and potential fluid explosions, which can damage packers and casing integrity.

Innovation Solution

A bidirectional stabilizer with a cutting portion featuring blades and cutting nodes, designed to stabilize the drill string while increasing wellbore diameter, reducing trips, and enhancing fluid flow, by being coupled between the drill string and bottom hole assembly, with tungsten carbide inserts and adjustable angles to minimize wobble and maximize cutting efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional stabilizers are used to stabilize the drill string, then the drill string stability is improved, but the wellbore quality and diameter consistency deteriorate due to inability to smooth bidirectionally

Engineering Contradiction:

Improvedrill string stabilityVSAvoidwellbore diameter consistency

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The stabilizer body is divided into an upper stabilizing portion and a lower stabilizing portion with distinct functions. The upper portion features cutting elements for enlarging and smoothing the wellbore, while the lower portion provides drill string stabilization, allowing each segment to optimize its specific function rather than compromising between conflicting requirements

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stabilizer device performs multiple functions simultaneously: it stabilizes the drill string (traditional function), enlarges the wellbore diameter, and smooths the wellbore wall bidirectionally (new functions). This multi-functionality resolves the contradiction by integrating both stabilization and wellbore quality improvement into a single device

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Stability of the object's composition

If conventional stabilizers are used, then the drill string is stabilized, but the number of trips increases due to wellbore diameter drift requiring corrective interventions

Engineering Contradiction:

Improvedrill string stabilityVSAvoidnumber of trips

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The cutting elements on the upper stabilizing portion perform preliminary wellbore enlargement and smoothing actions during the drilling process itself, preventing wellbore diameter drift before it occurs. This eliminates the need for subsequent trips to correct diameter issues, as the wellbore is proactively maintained within specifications throughout drilling operations

Inventive Principle:

Principle #10Preliminary action

3Stability of the object's composition

If conventional stabilizers are used, then the drill string stability is maintained, but fluid flow is restricted and fluid explosions may occur

Engineering Contradiction:

Improvedrill string stabilityVSAvoidfluid flow restriction and fluid explosions

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The stabilizer design incorporates a through-bore configuration that extends axially through the entire stabilizer body, creating a direct fluid flow path from the upper to lower portions. This three-dimensional flow pathway allows drilling fluid to pass through the stabilizer without restriction, preventing pressure buildup that could lead to fluid explosions while maintaining drill string stability

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Manufacturing precision

If wellbore smoothing is performed unidirectionally, then some wellbore quality improvement is achieved, but bidirectional smoothing and diameter increase are not accomplished

Engineering Contradiction:

Improvewellbore qualityVSAvoidwellbore diameter

Core Design Contradiction:

Manufacturing precisionVSArea of stationary object

Solution Approach 1:

The upper and lower stabilizing portions are designed with asymmetric configurations optimized for their respective functions. The upper portion has cutting elements arranged for wellbore enlargement and smoothing, while the lower portion has a different configuration for drill string stabilization. This asymmetric design allows each portion to excel at its specific function while working together to achieve both wellbore quality improvement and diameter increase

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS9297209B1Bidirectional stabilizer

Publication Date: 2016.03.29 FRANKS INT

AI summary

A bidirectional stabilizer and a drill string wherein the bidirectional stabilizer reduces motion while rotating into and out of a wellbore. The bidirectional stabilizer can be coupled on a first shaft end to the drill string and on a second shaft end to a bottom hole assembly or other downhole equipment. The bidirectional stabilizer can have an annulus configured for maximum wellbore fluid flow. A cutting portion can be formed on a shaft with a plurality of blades between the first shaft end and the second shaft end. The plurality of blades of the cutting portion can be on a first plane and a plurality of cutting nodes can be on a second plane for smoothing a wellbore.