Downhole Perforating Tool Pressure Triggered Firing
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Solution Overview
Problem
Conventional perforating guns are limited in their ability to perform precise, shallow perforations for tasks like gas pocket ventilation, cement squeezing, and zone isolation, and require multiple trips and equipment changes, posing risks during well abandonment and leakage sealing.
Innovation Solution
A downhole perforating tool with externally arranged charges and a firing system that can be triggered by pressure sequences, utilizing a ball seat and rupture disc to control internal pressure and enable selective firing and fluid circulation, allowing for multiple uses during a single run without tripping out of the well.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional perforating guns are used for shallow perforations, then the perforation depth can be controlled, but multiple trips and equipment changes are required
Solution Approach 1:
The device combines multiple functions into a single tool: it can perform both perforation (creating holes in casing) and ventilation (circulating fluids) operations during one deployment. The same device body houses both the charge assembly for perforation and the ball seat mechanism for fluid circulation, eliminating the need to trip out and change equipment between these operations.
Solution Approach 2:
The invention merges the perforating gun functionality with the ventilation tool functionality into a single integrated device. The charges are arranged on the outside of the pipe section, and the ball seat is incorporated into the same device body, allowing both hole creation and fluid circulation capabilities in one tool assembly.
2Adaptability or versatility
If conventional perforating guns are used, then perforation can be achieved, but the ability to perform multiple operations during a single run is limited
Solution Approach 1:
The device is segmented into distinct functional modules: the pipe section body, externally arranged charges with their own firing mechanism, and the ball seat assembly. This modular segmentation allows each component to perform its specific function independently while being integrated into a single deployable unit, enabling multiple operations without excessive complexity.
3Adaptability or versatility
If multiple equipment changes are required, then different operations can be performed, but the risk during well abandonment increases
Solution Approach 1:
By making the device universal capable of both perforation and ventilation operations, the need to trip out and change equipment is eliminated. This reduces the window of opportunity for accidents during well abandonment operations and maintains safety by keeping the well under continuous control with a single deployed tool.
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 efficient and controlled perforation, ventilation, and sealing operations with reduced risk, allowing for multiple firing sequences and fluid circulation without the need for repeated equipment deployment, enhancing well abandonment and leakage management.
Implementation Method 1
charges (2) arranged on the outside, i.e. the charges being fired are arranged on the outside of the pipe section (3) forming the tool (1)
Implementation Method 2
the device 1 can be provided with a ball seat 5 furthest down/outermost in a ported end-sub 6... The ball 7 settles in the ball seat 5 and shuts the opening formed by the ball seat 5. The communication between the inside of the drill string/device 1 and the outside is now shut off. The pressure on the inside of the drill string/device 1 can now be increased
Data Source
AI summary
A device and a method are for perforating downhole casings. The method includes arranging a device on a drill string, running the device into a bore hole, dropping a ball down through the drill string down to the device for causing a first sequence of pressure rise and relief, causing a firing system to trigger a charge for punching one or more holes through a surrounding casing wall in response to the first sequence of pressure rise and relief, driving the pressure inside of the drill string up to a second level, and causing a rupture disc at the second level to burst so as to establish a fluid communication between the inside and outside of the drill string through the opening in the pipe wall of the pipe section.