Multi-cycle Downhole Pipe Cutter with Indexing Mechanism
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Solution Overview
Problem
Current methods for removing casing in a wellbore often require multiple trips into the wellbore due to inadequate severing, increasing time and costs as multiple cuts are necessary to successfully extract the casing.
Innovation Solution
A multi-cycle downhole cutting tool with pivotably mounted cutter knives and a pressure-activated piston assembly that allows for multiple cuts at different locations in a single trip, utilizing an indexing mechanism to selectively engage and extend cutter knives with fluid pressure, and a pressure drop indicator to confirm cut completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutting device is run into the wellbore multiple times to cut and extract sections of casing, then the casing can be severed and removed, but the time and costs involved in completing a casing extraction are greatly increased
Solution Approach 1:
The cutting tool is divided into multiple independent cutter assemblies (first set and second set of cutters) that can be selectively activated. Each cutter assembly includes its own cutting elements and activation mechanism, allowing sequential engagement of different cutter sets to make multiple cuts without retrieving the tool from the wellbore.
Solution Approach 2:
The tool is designed with multiple cutter assemblies already positioned and ready for activation at predetermined locations. The indexing mechanism pre-positions the cutters, and upon activation, they sequentially engage to make cuts at different depths or locations in a single operational sequence, eliminating the need for multiple separate trips.
2Ease of operation
If multiple trips into the wellbore are required to sever and remove casing, then the casing can be extracted, but the operational costs and time consumption are greatly increased
Solution Approach 1:
The cutting tool is designed as a multi-functional device that can make multiple cuts at different locations and orientations within a single deployment. The tool body accommodates multiple cutter assemblies that can be independently activated, allowing the same tool to perform what previously required multiple separate operations and tool deployments.
Solution Approach 2:
The indexing mechanism enables continuous sequential activation of cutter assemblies without requiring tool retrieval. Once activated, the cutters engage in sequence to complete multiple cuts in one continuous operational sequence, maximizing the useful action time of the tool while it remains in the wellbore.
3Manufacturing precision
If the casing was not severed adequately at a certain location, then the spearing device must be removed and the cutting device reinserted for a second cut, but this process repetition greatly increases time and costs
Solution Approach 1:
The cutting tool incorporates multiple independent cutter assemblies positioned at different locations along the tool body. Each cutter assembly can be independently activated to make a cut at a specific location, ensuring that if one cut is insufficient, other cutters can make additional cuts at different positions without requiring tool retrieval.
Solution Approach 2:
The indexing mechanism allows for sequential activation of different cutter assemblies by changing the operational parameters (activation sequence, positioning). This enables the system to adapt and make additional cuts at different locations or with different cutting parameters if the initial cut was inadequate.
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
Enables multiple casing cuts in a single trip, significantly reducing the time and costs associated with casing extraction by ensuring effective severing and removal.
Implementation Method 1
A multi-cycle downhole cutting tool with pivotably mounted cutter knives and a pressure-activated piston assembly that allows for multiple cuts at different locations in a single trip
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A downhole pipe cutting tool includes a tool body having a piston assembly disposed in a central bore thereof, wherein the piston assembly is configured to translate longitudinally along the central axis of the tool body, and a plurality of cutter knife sets. Each of the plurality of cutter knife sets includes at least two individual cutter knives circumferentially spaced about a central axis of the tool body and is configured to selectively engage with the piston assembly to extend outward to perform pipe cutting operation.