Shock Mitigator for Perforating Guns
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Solution Overview
Problem
Perforating guns used in hydrocarbon wells experience significant damage due to 'gun shock' during use, limiting their size, explosive energy, and reusability, as well as causing damage to adjacent equipment, which restricts perforating application options and requires frequent assembly redressing.
Innovation Solution
A shock mitigator is introduced, comprising separate members with shock-absorbing implements at their interface, allowing a line for power and communication to pass through, effectively reducing bi-directional shock energy and enabling larger, more energetic guns with reduced damage to sensitive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the gun diameter is increased to accommodate more explosive energy and larger charge profiles, then the perforating application options and explosive energy are improved, but the gun shock damage to adjacent tools and electronics worsens
Solution Approach 1:
A shock mitigator is introduced as an intermediary component positioned between the perforating gun and adjacent downhole tools. This mitigator absorbs and dissipates shock waves generated during firing, preventing direct transmission of gun shock to sensitive electronics and tools. The intermediary structure allows larger guns with greater explosive energy to be used without proportionally increasing damage to adjacent equipment.
2Reliability
If the gun diameter is limited to under 2.5 inches to minimize shock damage, then the reliability and reusability of the gun assembly are improved, but the perforating application options and explosive energy are reduced
Solution Approach 1:
The shock mitigator serves as a protective intermediary that decouples the relationship between gun size and shock damage. By absorbing shock energy before it reaches the gun assembly and adjacent tools, the mitigator enables larger diameter guns to maintain the same reliability and reusability characteristics as smaller guns, thereby expanding perforating application options without sacrificing assembly longevity.
3Productivity
If the gun length is increased to accommodate more perforating ports, then the productivity and coverage are improved, but the amount of shock damage to the assembly increases
Solution Approach 1:
The shock mitigator acts as a buffer between the long gun assembly with multiple perforating ports and the sensitive downhole tools. By absorbing and dissipating shock waves along the length of the gun, the mitigator allows extended gun lengths with increased numbers of perforating ports to be deployed without proportionally increasing cumulative shock damage to the assembly or adjacent equipment.
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 shock mitigator absorbs up to half of the shock energy, allowing for larger guns and more flexible perforating applications without frequent assembly redressing, enhancing the reliability and capability of perforating operations while minimizing damage to electronics and other equipment.
Implementation Method 1
A shock mitigator is introduced, comprising separate members with shock-absorbing implements at their interface, allowing a line for power and communication to pass through, effectively reducing bi-directional shock energy
Data Source
AI summary
An assembly with a shock inducing tool and shock sensitive components. The assembly includes a shock mitigator that is constructed in a manner that allows a communication line to stretch across an interface of the mitigator between a housing for the components and the shock inducing tool. So, for example, where the tool is a perforating gun, power and/or communication with the tool need not be sacrificed for in exchange for safeguarding electronic components of the housing with the mitigator.