Perforating Gun Variable Free Volume Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing perforating guns experience excessive pressure reduction in the wellbore after firing, leading to underbalanced conditions that can cause formation breakdown and sand production, necessitating the ability to selectively vary the free gun volume for controlled pressure management.
Innovation Solution
The method involves determining a desired free gun volume based on the required pressure reduction and adjusting it by adding or removing a flowable material around the perforating charges, allowing for customizable pressure control in the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the perforating gun is fired with a fixed free gun volume, then the perforation operation is simple and quick, but the pressure reduction in the wellbore is excessive causing formation breakdown and sand production
Solution Approach 1:
The perforating gun incorporates a movable partition wall that can dynamically adjust the free gun volume during the perforation operation. The partition wall can be positioned to reduce the free gun volume before firing and then moved to increase the volume after firing, thereby dynamically controlling the pressure reduction effect and preventing formation breakdown while maintaining operational efficiency
Solution Approach 2:
The system changes the physical parameter of free gun volume by introducing a movable partition wall that can alter the internal volume configuration. By adjusting the position of the partition wall, the free gun volume is changed to achieve the desired pressure reduction control, transforming a fixed-parameter system into a variable-parameter system that adapts to different well conditions
2Object-affected harmful factors
If the free gun volume is reduced to control pressure reduction, then formation breakdown is prevented, but the device complexity increases due to additional volume reduction components
Solution Approach 1:
The perforating gun is segmented into distinct functional zones by introducing a movable partition wall that divides the internal volume. This segmentation allows independent control of the free gun volume in different sections, enabling precise pressure control while keeping each segment's structure relatively simple and manageable
Solution Approach 2:
The movable partition wall acts as an intermediary element that mediates between the perforating charges and the wellbore environment. It provides a mechanical means to control the free gun volume without requiring complex electronic controls or multiple separate components, simplifying the overall system while achieving the desired pressure reduction control
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 approach enables precise control of pressure reduction in the wellbore post-firing, preventing formation breakdown and optimizing perforation operations by tailoring the free gun volume to specific well and formation conditions.
Implementation Method 1
a flowable material to flow about the perforating charges in the perforating gun
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method of adjusting a pressure reduction to occur in a wellbore following firing of at least one perforating gun can include determining a desired free gun volume which corresponds to a desired pressure reduction in the wellbore resulting from firing of the perforating gun, and varying a free gun volume of the perforating gun until the free gun volume is substantially the same as the desired free gun volume. A well system can include at least one perforating gun positioned in a wellbore, the perforating gun comprising multiple perforating charges and a free gun volume, and the free gun volume being reduced by presence of a flowable material about the multiple perforating charges.