Perforating Charges Create Reverse Flow to Clean Tunnels
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Solution Overview
Problem
The explosive perforating process in well completion creates shock-damaged regions with lower permeability and debris-filled perforation tunnels, impairing the productivity of production wells and injectivity of injector wells.
Innovation Solution
A system and methodology that uses detonated perforating charges to initiate a time delay device, creating a pressure underbalance in the borehole, which facilitates a reverse flow through the perforations to clean them by carrying debris out, thereby reducing damage and enhancing fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If explosive perforating charges are used to create perforations, then openings are formed through the casing and into the formation, but shock damaged regions with lower permeability and debris-filled tunnels are created
Solution Approach 1:
A cleaning fluid is introduced into the borehole before the perforating charges are detonated. This preliminary action ensures that when the charges are fired and create perforations, the cleaning fluid is already present to immediately begin clearing debris from the perforation tunnels, reducing shock damage effects and improving perforation quality.
Solution Approach 2:
The explosive force that creates shock damage and debris is converted into a beneficial cleaning mechanism. The detonation of perforating charges not only creates the perforations but also generates a pressure wave that propels the cleaning fluid through the perforation tunnels, effectively clearing debris and reducing shock damage in the process.
2Object-affected harmful factors
If cleaning fluid is introduced before perforation, then debris removal is improved, but the complexity of the operation increases
Solution Approach 1:
The cleaning fluid serves multiple functions: it is introduced before perforation to prepare for debris removal, and the same fluid is then propelled by the explosive pressure wave to actually clean the perforation tunnels. This multi-functionality eliminates the need for separate cleaning equipment or procedures, reducing operational complexity while improving debris removal.
Solution Approach 2:
The perforating operation itself provides the cleaning function. The explosive pressure wave generated during perforation automatically propels the cleaning fluid through the tunnels without requiring additional pumping equipment or separate cleaning operations. The system uses its own energy to perform the cleaning task.
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 method improves fluid flow characteristics by cleaning perforation tunnels, reducing damage, and enabling low-fracture initiation pressure, thus enhancing well performance and productivity.
Implementation Method 1
A plurality of perforating charges may be detonated in the borehole to create perforations
Implementation Method 2
The detonation is used to initiate a time delay device for controlling a subsequent ignition of a corresponding charge. The corresponding charge is used to create a pressure underbalance in the borehole
Implementation Method 3
This relatively lower pressure in the borehole is selectively established to create a reverse flow through the perforations which cleans the perforations
Data Source
AI summary
A technique facilitates formation of perforations into a formation surrounding a borehole in a manner which enhances fluid flow along the perforations. The technique comprises providing a plurality of perforating charges which may be detonated in the borehole to create perforations. The detonation is used to initiate a time delay device for controlling a subsequent detonation of a corresponding charge. The corresponding charge is used to create a pressure underbalance in the borehole. This relatively lower pressure in the borehole is selectively established to create a reverse flow through the perforations which cleans the perforations.