Wellbore Cleaning Bit Segmentation Prevents Sidetracking

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

There is a need for drilling systems and methods that effectively clean previously drilled wellbores to ensure they are free of obstructions and have a sufficient diameter to receive casing, while minimizing the risk of sidetracking during the cleaning process.

Innovation Solution

The development of wellbore cleaning bits with a casing bit body attached to a shank, configured for attachment to a drill string, featuring cutting structures and a design that prevents side-tracking, including hardfacing materials and PDC cutting elements, which are advanced through the wellbore with a drill string to clean and prepare the wellbore for casing installation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a drill bit is used to clean a previously drilled wellbore, then the wellbore can be cleaned of obstructions, but the drill bit may veer off from the original wellbore path causing sidetracking

Engineering Contradiction:

Improvewellbore cleaning capabilityVSAvoidbore path stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The cleaning bit is segmented into multiple functional elements: a body with cutting structures for cleaning, and a separate stabilizing component with bearing surfaces that contact the wellbore wall. This segmentation allows the cleaning function and stabilizing function to be independent, preventing the cleaning bit from veering off course while maintaining effective wellbore cleaning.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stabilizing component acts as an intermediary between the cleaning bit body and the wellbore wall. Its bearing surfaces contact the wellbore wall to provide guidance and prevent sidetracking, while the cutting structures on the bit body perform the cleaning function. This intermediary stabilizing element mediates between the cleaning action and the bore path stability requirement.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the wellbore diameter is increased to ensure adequate clearance for casing, then casing can be installed smoothly, but the risk of sidetracking increases

Engineering Contradiction:

Improvecasing installation efficiencyVSAvoidbore path stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The cleaning bit is designed with adjustable parameters including the configuration of cutting structures and stabilizing elements. By optimizing the diameter and shape parameters of the bit body and stabilizing component, the system achieves adequate clearance for casing installation while maintaining bore path stability through proper geometric design of the stabilizing bearing surfaces.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If a reamer device is used to enlarge the wellbore diameter, then adequate clearance for casing is achieved, but the device complexity increases

Engineering Contradiction:

Improvewellbore diameter precisionVSAvoidbottom hole assembly complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The invention merges the reaming function and stabilizing function into a single integrated cleaning bit assembly. The bit body with cutting structures performs the reaming/enlarging function while the stabilizing component with bearing surfaces provides guidance and prevents sidetracking. This consolidation eliminates the need for separate reamer devices and reduces overall bottom hole assembly complexity while maintaining wellbore diameter precision.

Inventive Principle:

Principle #5Merging (Combining)

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

The solution ensures that wellbores are cleaned efficiently and safely, maintaining the original bore path to prevent sidetracking and ensuring the wellbore diameter is adequate for casing, thereby facilitating smooth casing advancement and installation.

Implementation Method 1

the cutters or abrasive structures thereof cut, crush, shear, and/or abrade away the formation material

Methodology Applied

Scientific EffectAbrasion: Abrasion

Implementation Method 2

the cutters or abrasive structures thereof cut, crush, shear, and/or abrade away the formation material

Methodology Applied

Scientific EffectImpact Force: Impact Force

Data Source

PatentUS8887836B2Drilling systems for cleaning wellbores, bits for wellbore cleaning, methods of forming such bits, and methods of cleaning wellbores using such bits

Publication Date: 2014.11.18 BAKER HUGHES CO

AI summary

Wellbore cleaning bits include a bit body, at least one cutting structure on the bit body, and a shank configured to attach the bit body to a drill string. Drilling systems for cleaning wellbores include a wellbore cleaning bit coupled to a drill string. The wellbore cleaning bit may include a casing bit body and a shank attached to the casing bit body and the drill string. A casing bit may be attached to a shank having a connection portion configured for attachment to a drill string to form wellbore cleaning bits for cleaning at least a section of a wellbore. Furthermore, a casing bit may be advanced into a wellbore using a drill string to clean a wellbore.