Perforating Tool Gas Release for Dynamic Underbalance Mitigation
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Solution Overview
Problem
Existing perforating tools experience dynamic underbalance events during formation perforation, leading to rapid fluid flow that can damage the formation, tunnels, or both, due to transient overbalanced conditions caused by shaped charge detonation.
Innovation Solution
A perforating tool with a pressure applicator configured to release a high-pressure gas simultaneously with shaped charge detonation, mitigating the dynamic underbalance by reducing the carrier-wellbore pressure differential and stabilizing the wellbore-formation pressure differential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If shaped charges are detonated to create perforations, then perforations are formed allowing fluid flow, but dynamic underbalance occurs causing rapid fluid flow that can damage the formation
Solution Approach 1:
The system pre-pressurizes the carrier interior before shaped charge detonation, creating a pressure state that opposes the harmful rapid fluid inflow. This preliminary pressure buildup acts as a counter-force to prevent the dynamic underbalance from causing formation damage, while still allowing the perforation process to proceed effectively.
Solution Approach 2:
The system changes the pressure parameter within the carrier interior by introducing and pressurizing gas or fluid before detonation. This parameter modification transforms the carrier-wellbore pressure differential from a state prone to harmful fluid inflow to a stabilized state that prevents formation damage during the perforation process.
2Reliability
If carrier interior is sealed to maintain atmospheric pressure, then shaped charges can detonate effectively, but dynamic underbalance events cause rapid wellbore fluid inflow into the carrier
Solution Approach 1:
The system performs preliminary pressurization of the carrier interior with gas or fluid before the shaped charge detonation. This preliminary action establishes a pressure state that prevents harmful fluid inflow during the subsequent detonation, while the sealed carrier design maintains the integrity needed for effective shaped charge operation.
Solution Approach 2:
The system introduces an intermediary substance (gas or fluid) into the carrier interior that acts as a mediator between the shaped charges and the wellbore fluids. This intermediary pressure buildup blocks the direct harmful interaction between wellbore fluids and the carrier interior during detonation, while still allowing the perforation function to proceed.
3Productivity
If wellbore fluid pressure is maintained below formation fluid pressure for underbalanced drilling, then formation fluids flow into the wellbore for production, but rapid fluid flow during perforation can damage the formation
Solution Approach 1:
The system pre-pressurizes the carrier interior to create a pressure state that opposes the harmful rapid fluid inflow from the wellbore. This preliminary pressure buildup acts as a counter-force that prevents the dynamic underbalance from causing formation damage, while still allowing the underbalanced production condition to be maintained during normal operation.
Solution Approach 2:
The system builds up pressure in the carrier interior beforehand to cushion against the harmful effects of rapid fluid inflow during perforation. This prior cushioning pressure acts as a buffer that protects the formation from damage while allowing the underbalanced drilling and production process to proceed effectively.
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 simultaneous gas release stabilizes pressure differentials, preventing rapid fluid flow and minimizing damage to the formation and tunnels, ensuring controlled perforation processes.
Implementation Method 1
The pressure applicator is configured to release a gas simultaneous with detonation of the at least one shaped charge... the release of the gas increases pressure within the interior of the carrier
Implementation Method 2
a surface signal actuates a firing head associated with the perforating gun, which then detonates the shaped charges. Projectiles or jets formed by the explosion of the shaped charges penetrate the casing
Implementation Method 3
detonation of the shaped charges creates a transient overbalanced condition... the detonation creates a transient overbalanced condition between the wellbore and the formation
Implementation Method 4
When the shaped charges are detonated, the detonation creates a transient overbalanced condition between the wellbore and the formation... pressure is introduced to the wellbore that causes the wellbore fluid pressure to exceed the formation fluid pressure briefly
Implementation Method 5
Dynamic underbalance between the perforating tool and the wellbore causes the wellbore fluids to flow rapidly from the wellbore into the interior of the carrier
Data Source
AI summary
A perforating tool for perforating a subterranean formation intersected by a wellbore includes a carrier having an interior in which are disposed at least one shaped charge and a pressure applicator. The pressure applicator may be configured to release a gas simultaneous with detonation of the at least one shaped charge.