Biodegradable Perforating Liner for Debris-Free Well Completion
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Solution Overview
Problem
Perforating operations in oilfields often result in debris being introduced into the rock formation, leading to skin damage and reduced well productivity, which can be costly and time-consuming to rectify.
Innovation Solution
A perforating system utilizing components made from anodic materials with negative corrosion potential that degrade rapidly, leaving zero debris, either by dissolving or fragmenting into harmless particles, to minimize damage and enhance fluid communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If encapsulated shaped charges are used, then penetration depth into rock formation is improved, but debris generation increases causing skin damage
Solution Approach 1:
The patent changes the material parameter of the shaped charge liner from conventional steel to a biodegradable polymer material. This parameter change allows the liner to maintain structural integrity during firing and achieve deep penetration, then gradually degrade afterward to minimize debris. The biodegradable material transforms from a solid structural component into harmless byproducts over time, resolving the contradiction between penetration depth and debris generation.
Solution Approach 2:
The patent employs a disposable shaped charge liner made of biodegradable polymer that serves its purpose during firing and then degrades completely. Unlike permanent steel liners that create lasting debris, this disposable liner is designed to break down into harmless substances, eliminating the need for subsequent debris removal operations while maintaining effective penetration capability during the critical firing phase.
2Object-generated harmful factors
If perforating is conducted underbalanced to mitigate debris damage, then skin damage is reduced, but wellbore pressure control complexity increases
Solution Approach 1:
The patent enables the shaped charge liner to self-digest through biodegradation after firing. The material inherently breaks down through environmental exposure and chemical reactions without requiring external intervention such as acidizing or mechanical debris removal. This self-service mechanism eliminates the need for complex post-perforation debris management and eliminates skin damage at its source, resolving the contradiction between reducing skin damage and simplifying wellbore pressure control.
3Productivity
If extra intervention is performed to remove debris, then well productivity is improved, but time and cost increase
Solution Approach 1:
The patent incorporates debris prevention into the initial perforating operation itself by using biodegradable liner material. The liner is designed to degrade automatically after serving its structural purpose during firing, preventing debris accumulation before it can cause skin damage or productivity loss. This preliminary action of built-in degradation eliminates the need for subsequent intervention operations, saving both time and cost while maintaining optimal well productivity.
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 use of anodic materials in perforating systems effectively reduces debris, preventing skin damage and enhancing well productivity by ensuring minimal residual material post-firing, thus improving the efficiency and cost-effectiveness of perforating operations.
Implementation Method 1
a component that incorporates an alloy having a negative corrosion potential and being unable to passivate, and the component adapted to disintegrate to form substantially no debris in response to the firing of the perforating system
Data Source
AI summary
An apparatus that is usable with a well includes a perforating system that is adapted to be fired downhole in the well. The perforating system includes a component, which includes an alloy that has a negative corrosion potential and is unable to passivate, or self-protect, while deployed in the well. The component is adapted to disintegrate to form substantially no debris in response to the firing of the perforating system.