Mechanically Perforated Well Casing Collar Guide Lock
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Solution Overview
Problem
Current well completion methods, such as sliding sleeve systems and pressure perforation, face limitations in long lateral wells due to high and unpredictable downhole fluid pressures, leading to inefficiencies and reliability issues with mechanical perforators that deform the casing and have limited duty cycles.
Innovation Solution
A mechanically perforated well casing collar with machined-away areas and a guide and lock structure to align and lock a mechanical perforator, allowing for controlled perforation without deformation and ensuring consistent perforation size, facilitating uninterrupted well completion regardless of well length or pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical perforators are used to perforate standard casing, then perforation can be achieved regardless of wellbore pressure, but the mechanical perforators deform the internal diameter of the casing and have a limited duty cycle
Solution Approach 1:
The casing collar is designed with localized machined-away areas that reduce material only at specific perforation sites, while the rest of the casing maintains its full structural integrity and original internal diameter. This localized material removal allows the mechanical perforator to cut through weakened sections without deforming the overall casing structure.
Solution Approach 2:
The machined-away areas are prepared in advance during casing collar manufacturing, creating pre-weakened zones that require less force to perforate. This preliminary action reduces the duty cycle requirement by pre-preparing the casing for easy perforation at the desired locations.
2Productivity
If sliding sleeve valves are used for well completion, then uninterrupted fracturing can be achieved, but the length of wellbore that can be completed is limited due to size-graduated ball constraints
Solution Approach 1:
The well completion system is segmented into multiple casing collars, each with its own machined-away areas and capable of being mechanically perforated independently. This segmentation allows the system to handle wellbores of any length by simply adding more perforatable collar sections, eliminating the ball size graduation limitations of sliding sleeve systems.
3Reliability
If pressure perforation is used in long lateral wells, then perforation can be achieved, but high and unpredictable downhole fluid pressures cause inefficiencies and reliability issues
Solution Approach 1:
The machined-away areas are prepared in advance during manufacturing, creating pre-weakened zones that require minimal force to perforate. This preliminary preparation eliminates the need to overcome high and unpredictable downhole pressures during the actual perforation operation, significantly improving well completion efficiency and reliability.
Data Source
AI summary
A mechanically perforated well casing collar has at least one machined-away area on a sidewall surface to facilitate mechanical perforation of the casing collar, and an internal guide and lock structure to guide at least one blade of a mechanical perforator into alignment with the at least one machined-away area and permit the mechanical perforator to lock in that alignment.