Perforating Tool Tubular Pulling Pressure Wave
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Solution Overview
Problem
Existing methods for pulling tubulars from subterranean wells face challenges due to settled solids in the annulus, which increase the required pulling force and can exceed the yield strength of the tubing or the pulling capability of the work string.
Innovation Solution
A method involving a work string with a perforating tool and a tubular pulling tool, where the perforating tool forms perforations through the tubular and into the annulus while maintaining pulling tension, allowing the tubular to be pulled out without fluid circulation from the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If fluid circulation is used to remove settled solids from the annulus, then the pulling force required is reduced, but the device complexity and operational cost increase due to requiring a drilling rig and fluid circulation system
Solution Approach 1:
The invention extracts and removes the drilling rig and fluid circulation system from the operation by using a perforating tool to create direct pathways through the settled solids, eliminating the need for complex fluid circulation infrastructure while reducing the pulling force required
Solution Approach 2:
The invention replaces the mechanical fluid circulation system with a perforating mechanism that creates direct physical pathways through the solids, substituting a simple perforation action for the complex mechanical system of pumps, hoses, and fluid circulation equipment
2Reliability
If multiple runs are performed to retrieve tubing sections, then the tubing yield strength is not exceeded, but the productivity and time efficiency decrease
Solution Approach 1:
The invention performs preliminary perforation of the settled solids before the pulling operation, creating pathways that reduce friction and allow the tubular to be pulled out in a single operation without exceeding yield strength, thereby improving productivity while maintaining reliability
Solution Approach 2:
The invention enables continuous pulling operation in a single run by pre-perforating the solids to eliminate friction peaks that would otherwise require stopping and restarting the operation, maintaining continuous useful action from start to finish
3Device complexity
If settled solids remain in the annulus, then the device complexity is reduced, but the pulling force required exceeds the tubing yield strength or work string pulling capability
Solution Approach 1:
The invention introduces a perforating tool as an intermediary that creates pathways through the settled solids, acting as a mediator between the pulling force and the solids to reduce friction without requiring complex fluid circulation systems
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
This method enables efficient pulling of tubulars in one run, reducing the need for fluid circulation and potentially eliminating the requirement for a drilling rig, thereby saving costs and improving operational efficiency.
Implementation Method 1
activating the perforating tool to form a plurality of perforations extending from an inner wall of the tubular through a material deposited in an annulus defined between the tubular and an outer tubular
Data Source
AI summary
A method for pulling a tubular out of a subterranean well including the steps of:i) lowering a work string into the well which includes a perforating tool and a tubular pulling tool;ii) connecting the tubular pulling tool to the tubular and apply a pulling tension to the tubular;iii) activating the perforating while the applied pulling tension to the tubular is maintained;iv) immediately upon activating the perforating tool and while maintaining pulling tension to the tubular, pulling the tubular on the work string out of the subterranean well;wherein a cut in the tubular is formed prior to or simultaneously with step iii); and wherein the cut is arranged such that the tubular can be pulled out of the subterranean well during step iv).Further, a system for pulling a tubular was also disclosed.