Ceramic Disk Dissolution via Strong Acid Injection
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Solution Overview
Problem
Conventional methods for removing ceramic disks in wellbores during hydrocarbon production are time-consuming, energy-intensive, and prone to complications such as tool lock-up and debris formation, limiting the ability to perform multiple tasks simultaneously and efficiently.
Innovation Solution
The use of strong acids like hydrofluoric acid (HF) or hydrochloric acid (HCl) to dissolve ceramic disks, allowing for simultaneous pressure maintenance and reservoir stimulation in a single downhole operation, reducing the need for multiple tools and operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional milling tools are used to mechanically destroy the ceramic disk, then the disk can be ruptured, but heavy equipment is required, substantial time and energy are consumed, and debris formation occurs in the wellbore
Solution Approach 1:
The patent replaces the mechanical milling system with a chemical dissolution system. Instead of using mechanical milling tools that physically grind the ceramic disk, the invention uses strong acids (such as hydrofluoric acid or hydrochloric acid) injected through coiled tubing to chemically dissolve the ceramic disk material, allowing it to fail structurally and rupture without mechanical contact
Solution Approach 2:
The patent extracts the ceramic disk removal function from the mechanical toolset and transfers it to a chemical agent. The strong acid is delivered separately through coiled tubing to the ceramic disk location, where it dissolves the disk material in situ, eliminating the need for mechanical tools to remain in the wellbore during the rupture process
2Reliability
If milling tools are lowered downhole to rupture the ceramic disk, then the disk can be breached, but the process is time-consuming and prevents other downhole operations
Solution Approach 1:
The patent makes the coiled tubing system multi-functional by enabling it to perform both the ceramic disk rupture operation and the well stimulation operation. The same coiled tubing delivery system is used to first inject strong acid to dissolve the ceramic disk, and then to inject stimulation acid to treat the reservoir formation, consolidating multiple operations into a single tool run
Solution Approach 2:
The patent merges two separate operations (ceramic disk rupture and well stimulation) into a single integrated process. Both operations use the same chemical injection methodology through coiled tubing, allowing the ceramic disk to be dissolved and the reservoir to be stimulated during one continuous operation rather than requiring separate tool runs
3Reliability
If heavy milling equipment is used to destroy the ceramic disk, then the disk can be ruptured, but complications occur such as coil tubing getting locked-up or breakage of heavy equipment
Solution Approach 1:
The patent replaces heavy mechanical milling equipment with a lightweight chemical injection system. Instead of deploying large diameter milling tools that require heavy handling equipment and create lock-up risks, the invention uses standard coiled tubing to deliver strong acids that dissolve the ceramic disk chemically, eliminating mechanical interference and deployment complications
Solution Approach 2:
The patent introduces strong acid as an intermediary substance that mediates the ceramic disk rupture process. Rather than direct mechanical contact between milling tools and the ceramic disk, the acid acts as an intermediate agent that dissolves the disk material, allowing structural failure to occur through chemical action rather than mechanical force
4Adaptability or versatility
If multiple tools are deployed for ceramic disk removal and well stimulation, then both tasks can be addressed, but the complexity of operations increases and time is lost
Solution Approach 1:
The patent creates a universal coiled tubing delivery system that can perform multiple functions: delivering strong acid for ceramic disk dissolution, delivering stimulation acid for reservoir treatment, and potentially delivering other chemical agents. This single multi-functional platform replaces the need for multiple specialized tools
Solution Approach 2:
The patent uses parameter changes in the chemical injection process to achieve different objectives. By adjusting acid concentration, injection rate, and injection volume, the same coiled tubing system can optimize for ceramic disk dissolution in one phase and for reservoir stimulation in another phase, allowing task transition without tool changes
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 method enables efficient removal of ceramic disks and stimulation of hydrocarbon reservoirs, reducing reservoir skin factors and enhancing production, while minimizing tool-related complications and improving operational efficiency.
Implementation Method 1
dissolving the ceramic disk with the strong acid such that the ceramic disk can no longer maintain pressure within the wellbore
Implementation Method 2
contacting the target formation with the strong acid such that the strong acid stimulates the hydrocarbon reservoir by reducing a reservoir skin factor
Data Source
AI summary
Methods and systems for breaching a ceramic disk installed in a wellbore during oil and gas well completion and production activities. A ceramic disk dissolves with a strong acid. Additionally, the strong acid is further used to stimulate a reservoir. The strong acid can be introduced to the wellbore through coiled tubing or directly from the surface.