Integrated Casing Cutting and Jarring Tool Assembly
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Solution Overview
Problem
Conventional methods for removing well casing require multiple trips, increasing time and costs due to the use of separate cutting and extraction tools, and are inefficient in slot recovery operations where multiple casing cuts are necessary.
Innovation Solution
A drilling tool assembly with a cutting device, spearing device, and jarring device that allows for multiple casing cuts and removals in a single trip, utilizing retractable cutting devices, hydraulically activated spearing devices, and jarring mechanisms to engage and free casing segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cutting and extraction tools are used in multiple trips, then the casing can be removed, but the time and costs increase significantly
Solution Approach 1:
The patent combines cutting devices, spearing devices, and jarring devices into a single integrated tool assembly that can perform multiple operations (cutting, engaging, and freeing casing) in one trip. This merging of previously separate tools and trips into a single comprehensive assembly directly reduces rig time while maintaining reliable casing removal capability
Solution Approach 2:
The tool assembly is designed with multi-functional capability to perform cutting, spearing, and jarring operations within a single device. This universal design allows the same assembly to handle multiple casing removal tasks that previously required separate specialized tools and multiple trips, thereby reducing time loss
2Reliability
If multiple trips are used for cutting and extraction, then the casing can be removed, but the operational costs increase
Solution Approach 1:
By merging cutting, spearing, and jarring functions into one tool assembly deployed in a single trip, the patent eliminates the need for multiple separate operations. This increases productivity by reducing the number of trips required, thereby lowering operational costs associated with repeated rig mobilization and demobilization
3Reliability
If separate cutting and extraction operations are performed, then the casing can be removed, but the process becomes time-consuming and expensive
Solution Approach 1:
The cutting devices are positioned and ready to cut casing at predetermined locations before the spearing and jarring operations begin. This preliminary positioning of cutting functions within the integrated assembly allows for seamless transition between cutting, engaging, and freeing operations, reducing overall operation duration while ensuring reliable casing removal
Data Source
AI summary
Methods of removing casing from a wellbore, the method including disposing a drilling tool assembly in a wellbore, the drilling tool assembly including a cutting device, a spearing device, and a jarring device. The methods further including activating the cutting device, cutting a first casing segment, deactivating the cutting device and activating a spearing device. The method further including engaging the spearing device with the first casing segment, activating the jarring device to free the first casing segment, and removing the first casing segment from the wellbore.