Dynamic Underbalance Pressure Generator for Wellbore Debris Removal
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Solution Overview
Problem
The existing methods for increasing fluid flow in wellbores, such as acidization and downhole explosives, are either ineffective or pose safety risks due to the buildup of wax, scale, and debris in perforation channels, which reduces hydrocarbon productivity over time.
Innovation Solution
A non-explosive dynamic underbalancing technique using an underbalance pressure generator device with frangible members that creates a pressure differential to draw debris out of perforation channels into the annulus, eliminating the need for explosives and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downhole explosives are used to create dynamic underbalance and clear debris from perforation channels, then fluid flow and hydrocarbon productivity are improved, but safety risks and harmful factors increase due to explosive storage and handling requirements
Solution Approach 1:
The patent replaces the explosive-based mechanical system with a pneumatic system using compressed gas (nitrogen or air) to generate the same dynamic underbalance effect. The pneumatic actuation mechanism uses a piston and valve arrangement that can be safely stored and handled on the surface, eliminating the need for downhole explosive storage and handling while achieving the same debris removal function.
Solution Approach 2:
The patent introduces compressed gas as an intermediary medium to transfer energy from the surface to the downhole environment. Instead of directly placing explosives in the wellbore, the system uses compressed gas stored in a surface vessel to actuate a pneumatic device downhole, creating a safe intermediary that achieves the same underbalance effect without the hazards of explosive storage.
2Productivity
If additional hydraulic fracturing or acidization is performed to counteract wax and scale buildup, then fluid flow is improved, but the complexity of wellbore operations increases
Solution Approach 1:
The patent segments the wellbore operation into distinct functional components: a pneumatic actuation system for creating dynamic underbalance, a frangible member for controlled rupture, and a debris removal mechanism. This segmentation allows each component to be optimized independently and simplifies the overall operation compared to multi-step acidization or fracturing processes.
Solution Approach 2:
The pneumatic device is designed to be self-actuating once the frangible member ruptures. The compressed gas automatically drives the piston to create the underbalance effect without requiring complex external control systems or multiple operational steps, thereby reducing overall operation complexity while maintaining effectiveness.
3Productivity
If perforation channels are re-perforated using additional downhole explosives, then productivity is restored, but the danger and complexity of storing and handling explosives around the rig site increases
Solution Approach 1:
The patent replaces the explosive-based re-perforation system with a pneumatic system that can be safely stored and handled on the surface. The pneumatic actuation mechanism uses a piston, valve, and frangible member arrangement that eliminates the need for explosive storage around the rig site while achieving the same productivity restoration through controlled underbalance and debris removal.
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 effectively increases fluid flow by clearing debris from perforation channels without the hazards associated with explosives, thereby maintaining or improving hydrocarbon productivity and ensuring safer operations.
Implementation Method 1
The underbalance pressure generator device includes one or more frangible members that may be pierced or otherwise ruptured with an actuation device to create the required underbalance within the wellbore
Implementation Method 2
one or more frangible members fixedly attached to the housing such that a pressure differential can be generated across the at least one frangible member between the implosion chamber and the exterior of the housing
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
An example underbalance pressure generator device includes a housing having a first end, a second end, and an implosion chamber between the first and second ends, one or more influx ports defined in the housing and enabling fluid communication between the implosion chamber and an exterior of the housing, at least one frangible member fixedly attached to the housing such that a pressure differential can be generated across the at least one frangible member between the implosion chamber and the exterior of the housing, and an actuation device within the housing and configured to rupture the at least one frangible member upon being triggered.