Microencapsulated Acid Perforation Strategies
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Solution Overview
Problem
In hydraulic fracturing, the non-targeted delivery of acid leads to excessive usage, causing formation damage, corrosion, and scale formation, necessitating a method for precise acid delivery at the perforation site to optimize residue removal and reduce breakdown pressure.
Innovation Solution
Microencapsulated acid or acid precursors are used, encapsulated in polymer particles that can be released at the perforation site through controlled mechanisms such as temperature, pressure, or explosion, allowing for targeted delivery and dosing using a perforation gun assembly with dedicated acid chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large quantities of acid are used for stimulation treatment, then the acid can effectively remove formation materials and lower breakdown pressure, but it causes over acidizing, near wellbore formation damage, corrosion, and scale formation
Solution Approach 1:
The acid is segmented into microencapsulated particles distributed throughout the fracturing fluid, allowing controlled release at specific locations rather than bulk application. This segmentation enables precise dosing and eliminates over-acidizing by delivering acid only where perforations occur.
Solution Approach 2:
The invention applies acid locally at the perforation site through microencapsulated particles that release acid precisely where needed. This local quality approach ensures acid acts only at the perforation zone, preventing widespread formation damage, corrosion, and scale formation while maintaining effective treatment.
2Reliability
If targeted delivery of acid at perforation site is implemented, then acid usage is optimized and formation damage is minimized, but the device complexity increases due to microencapsulation and controlled release mechanisms
Solution Approach 1:
Microencapsulated particles serve as intermediaries between the fracturing fluid and the formation, carrying acid in a controlled manner. These particles simplify the overall system by encapsulating the acid delivery function within a single transportable unit that releases acid automatically at the perforation site through temperature or pressure triggers.
Solution Approach 2:
The invention utilizes parameter changes (temperature and pressure) during the fracturing process to trigger acid release from microencapsulated particles. This approach simplifies control by leveraging natural process parameters rather than requiring active control systems, achieving reliable targeted delivery through passive response to downhole conditions.
3Measurement precision
If microencapsulated acid particles are used with controlled release mechanisms, then precise acid dosing is achieved at perforation site, but the manufacturing complexity increases
Solution Approach 1:
The microencapsulated acid particles are designed as disposable units that are mixed into the fracturing fluid and used once. This approach simplifies manufacturing by eliminating the need for complex recovery and reuse systems, allowing standard encapsulation processes to be employed while achieving precise acid dosing through the inherent properties of the microcapsules.
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 reduces the amount of acid required, minimizes formation damage, optimizes residue removal, and eliminates the need for large-scale transportation and storage of corrosive acids, while ensuring precise acid application at the perforation site.
Implementation Method 1
encapsulated in polymer particles that can be released at the perforation site through controlled mechanisms such as temperature, pressure, or explosion
Implementation Method 2
encapsulated in polymer particles that can be released at the perforation site through controlled mechanisms such as temperature, pressure, or explosion
Implementation Method 3
encapsulated in polymer particles that can be released at the perforation site through controlled mechanisms such as temperature, pressure, or explosion
Implementation Method 4
Acid may be used in a hydraulic fracturing process for many reasons including, for example, near wellbore clean out, remove perforation residue, to lower the formation breakdown pressure
Data Source
AI summary
Acid plays an important role in the hydraulic fracturing process, such as removing damage from the cement and formation which can result from perforating operations, thus providing a better path for the fracturing operations that follow. The disclosure relates generally to microencapsulated acid or acid precursor for targeted delivery and dosing of acid at the site of perforation in hydraulic fracturing applications, device and method of use the same. The targeted delivery and dosing of acid at the site of perforation provides the benefit of, including but not limited to, eliminating over acidizing (limiting near wellbore formation damage) and optimizing the removal of perforation residue and formation materials for lowering break-down pressure.