Friction-Reducing Tubular Body for Drilling Casing Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Drilling with casing is prone to excessive vibration, leading to premature failure and inefficiency due to increased centripetal forces and friction between the drilling casing and existing casing, which is more significant than with conventional drill pipes.
Innovation Solution
A tubular body with a friction-reducing material is positioned concentrically around the casing, allowing it to move relative to the rotating casing, thereby reducing contact friction and minimizing vibration by engaging with the wellbore instead of the existing casing, and additional features like stop members and contact members are used to manage axial movement and reduce contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drilling with casing is used to reduce operational time and cost, then productivity is improved, but excessive vibration and torque occur due to increased friction between the drilling casing and existing casing
Solution Approach 1:
A centralizer device is introduced as an intermediary component between the drilling casing and the existing casing. The centralizer includes a tubular body with friction-reducing material that contacts the existing casing, while the drilling casing rotates inside the tubular body. This intermediary structure mediates the interaction between the two casings, allowing the drilling casing to rotate with reduced friction and vibration while maintaining the productivity benefits of drilling with casing.
2Strength
If the drill string is removed and replaced with casing string to line the wellbore, then the wellbore support is improved, but two run-ins are required which increases operational time and cost
Solution Approach 1:
The invention merges the drilling function and casing lining function into a single operation. The drilling casing combines the drill string's earth-cutting capability with the casing's wellbore support function, eliminating the need for separate drilling and casing operations. This merging allows the drilling casing to both drill through formations and provide wellbore support simultaneously, reducing operational time while maintaining wellbore strength.
3Object-affected harmful factors
If friction-reducing material is applied to reduce vibration, then vibration is reduced, but device complexity increases due to additional components like tubular body, stop members, and lubricant channels
Solution Approach 1:
The centralizer device is segmented into functional components: a tubular body for structural support, friction-reducing material layers for vibration reduction, stop members for positioning, and lubricant channels for continuous lubrication. This segmentation allows each component to perform its specific function efficiently while maintaining overall device manageability and reducing the complexity burden through modular functional design.
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 effectively reduces drilling vibration and torque, minimizing wear and increasing operational efficiency by allowing continuous rotation of the casing while reducing frictional contact with the existing casing.
Implementation Method 1
A tubular body with a friction-reducing material is positioned concentrically around the casing, allowing it to move relative to the rotating casing, thereby reducing contact friction and minimizing vibration
Implementation Method 2
additional features like stop members, contact members, and lubricant channels are used to enhance vibration reduction
Data Source
AI summary
Apparatus and methods are provided for reducing drilling vibration during drilling with casing. In one embodiment, an apparatus for reducing vibration of a rotating casing includes a tubular body disposed concentrically around the casing, wherein tubular body is movable relative to the casing. Preferably, a portion of the tubular body comprises a friction reducing material. In operation, the tubular body comes into contact with the existing casing or the wellbore instead of the rotating casing. Because the tubular body is freely movable relative to the rotating casing, the rotating casing may continuously rotate even though the tubular body is frictionally in contact with the existing casing.