Rotating UHP Casing Cutter for Spark-Free Multi-Layer Well Cutting
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Solution Overview
Problem
Existing cutting tools for abandoning oil or gas wells pose safety risks due to sparking and require extensive excavation, are costly, or ineffective in cutting filled or blocked wells, and have limitations in cutting multiple layers without repositioning.
Innovation Solution
An ultra-high pressure (UHP) cutting device that rotates around the perimeter of the well or pile, using abrasive and UHP fluid to cut from outside, with adjustable supports and a cutter head for precise positioning and simultaneous cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutting torch is used to cut well casings and cement liners, then the casing can be cut effectively, but safety hazards increase due to ignition sources in areas with explosive or flammable gases
Solution Approach 1:
The patent replaces the thermal cutting system (cutting torch) with a mechanical cutting system consisting of rotating abrasive blades. The abrasive blades mechanically grind through the casing and cement liner without generating ignition sources, thereby eliminating the safety hazard of using open flames in potentially explosive environments while maintaining effective cutting capability
Solution Approach 2:
The patent employs high-pressure water jets (pneumatic/hydraulic system) to assist the mechanical cutting process. The high-pressure water serves multiple functions: it cools the abrasive blades during cutting, suppresses dust generation, and helps remove cut debris. This hydraulic assistance enables effective cutting without requiring thermal processes that would create ignition risks
2Ease of operation
If extensive excavation is performed to access well casings for cutting, then cutting access is achieved, but the complexity and cost of the operation increase
Solution Approach 1:
Instead of excavating from the outside to access the casing for cutting, the patent inverts the approach by inserting the cutting device inside the wellbore through the existing wellhead. The cutting tool is deployed from the top, allowing it to cut the casing and cement liner from the interior without requiring extensive external excavation, thereby simplifying the operation and reducing costs
3Ease of operation
If metal blades are used to cut casing from inside the wellbore, then cutting can proceed without extensive excavation, but the tool becomes jammed if the casing moves and metal-on-metal cutting causes sparking
Solution Approach 1:
The patent replaces the metal blade cutting mechanism with an abrasive cutting system using high-pressure water and abrasive materials. This substitution eliminates the metal-on-metal contact that causes sparking and reduces the likelihood of tool jamming. The abrasive water jet can adapt to casing movement more effectively while maintaining cutting effectiveness without generating ignition sources
Solution Approach 2:
The cutting mechanism utilizes a composite approach combining high-pressure water (fluid) with abrasive particles (solid). This composite cutting system combines the advantages of both materials: the water provides pressure and cooling while the abrasive particles perform the actual cutting. This combination allows effective cutting of both metal casing and cement liner without the limitations of pure mechanical blade cutting
4Device complexity
If a single-layer cutting tool is used, then the tool structure is simple, but the tool must be removed and repositioned for each cut layer reducing productivity
Solution Approach 1:
The cutting device is designed with multi-functionality to handle multiple layers and material types (casing and cement liner) with a single tool configuration. The tool incorporates adjustable cutting elements and high-pressure water delivery systems that can adapt to different cutting depths and material compositions, eliminating the need to remove and reposition the tool for each layer and significantly improving productivity
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 UHP cutting device provides safe, efficient, and cost-effective cutting of well casings and cement layers with minimal excavation, reducing safety hazards and operational costs while effectively handling filled or blocked conditions.
Implementation Method 1
UHP fluid cutting devices for cutting suitable bodies, such as pipes or piles
Implementation Method 2
using abrasive and UHP fluid to cut from outside
Data Source
AI summary
An ultra-high pressure (UHP) cutting device for cutting an elongate body from outside the elongate body are disclosed herein. Embodiments of the UHP cutting device have a UHP tube with a top end and a bottom end opposite the top end, the UHP tube defining a lumen for receiving UHP fluid, a static mount for securing the cutting device to the elongate body, a rotatable mount rotatably connected to the static mount, a radially adjustable support member for adjusting a distance of the UHP tube to the elongate body, the radially adjustable support member being connected adjacent to the top end of the UHP tube and the rotatable mount, a drive in operational communication with the rotatable mount for rotating the rotatable mount during operation of the cutting device, and a cutter head in fluid communication with the UHP line. Related uses and methods are also disclosed herein.