Downhole Acid Injection Tool with Corrosion Protection
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Solution Overview
Problem
Current downhole acid injection methods for formation stimulation are inefficient due to the risk of tool damage, inaccurate measurement inconsistencies, and safety hazards associated with handling and transporting acidic substances, leading to compromised test quality and increased operational costs.
Innovation Solution
The use of pre-packaged acid-resistant containers with burst discs or check valves, coated downhole tools, and neutralizing fluids to safely transport and inject acid, ensuring precise acid delivery and protecting equipment, while allowing for safer handling and reduced tripping times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acid injection methods are used with specialized tubing equipment, then acid can be injected into the formation, but the risk of tool damage from acid exposure increases and safety hazards arise
Solution Approach 1:
The acid is extracted from the conventional tubing equipment and placed into a dedicated acid-resistant container that is part of the formation tester assembly. This separation allows the acid to be contained in a specifically designed vessel that can withstand acid corrosion, while the rest of the testing equipment is protected from acid exposure.
Solution Approach 2:
An acid-resistant container serves as an intermediary between the acid and the formation tester components. This intermediary vessel is specifically designed to hold the acid safely and release it at the desired location, preventing direct contact between the acid and sensitive testing equipment.
2Measurement precision
If multiple trips are required to deploy wireline/DST and coiled tubing separately, then formation mobility can be measured before and after acid treatment, but measurement accuracy decreases due to location inconsistencies
Solution Approach 1:
The formation tester and acid injection capabilities are merged into a single integrated tool assembly. This allows mobility measurements to be taken and acid treatment to be applied at the exact same location without requiring separate deployments of wireline/DST and coiled tubing, eliminating location inconsistencies.
Solution Approach 2:
The downhole tool assembly is designed with multi-functionality, capable of both measuring formation mobility and injecting acid stimulation. This universal tool eliminates the need for multiple specialized tools and trips, while maintaining measurement accuracy through consistent positioning.
3Ease of operation
If conventional acid handling procedures are used, then acid can be transported and injected, but safety hazards increase and operational costs rise
Solution Approach 1:
The acid is pre-loaded into acid-resistant containers at the surface before deployment. This preliminary action allows for safe handling and storage of the acid in controlled conditions, eliminating the need for complex downhole acid transfer operations and reducing safety risks during transport and injection.
Data Source
AI summary
A method for performing an acid stimulation operation using a downhole tool includes conveying the downhole tool in a borehole that is formed in a subsurface formation. The downhole tool includes a chamber to store stimulation fluid comprising a stimulation acid. The downhole tool includes a fluid injector that is fluidly coupled to an output of the chamber via a flow line of the downhole tool. The method includes coating the flow line with an acid resistant fluid. The method includes injecting, from the fluid injector via the flow line, the stimulation fluid into the subsurface formation that is released through the output of the chamber.