CO2 Nanobubble Well Stimulation for Deep Pore Penetration
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Solution Overview
Problem
Existing acid stimulation methods for enhancing well performance in subsurface formations face limitations, particularly with the use of CO2, which is limited in effectiveness and contributes to a carbon footprint, and existing bubble sizes are not effective in penetrating porous formations or addressing condensate blockages.
Innovation Solution
The use of nano-sized bubbles, specifically CO2 nanobubbles, generated in a stimulation fluid to enhance well stimulation by penetrating porous formations and addressing condensate blockages, leveraging their stability and energy delivery for effective wellbore region treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If larger bubbles are used in stimulation fluid, then the fluid can be easily injected, but the bubbles cannot penetrate porous formations or address condensate blockages effectively
Solution Approach 1:
The patent changes the size parameter of bubbles from macro/micro scale to nanoscale (1-100 nm diameter). This parameter change enables the bubbles to penetrate porous formations and address condensate blockages while maintaining suspension in the stimulation fluid, thus resolving the contradiction between injection ease and penetration effectiveness.
2Reliability
If CO2 is used in acid stimulation fluid, then formation damage and condensate banking are removed efficiently, but the carbon footprint of the operation increases
Solution Approach 1:
The patent utilizes CO2 phase transitions by injecting CO2 under reservoir conditions where it transitions to supercritical phase, providing efficient formation damage removal. The nanobubbles serve as a delivery mechanism that enables effective CO2 utilization while potentially reducing the total volume of CO2 required, thus addressing the carbon footprint concern.
3Reliability
If nanobubbles are generated in stimulation fluid, then penetration of porous formations and addressing of condensate blockages is enhanced, but the complexity of fluid preparation increases
Solution Approach 1:
The patent employs nanobubble generation systems that can be integrated into existing stimulation fluid preparation equipment. The nanobubbles are generated in-situ within the stimulation fluid stream using ultrasonic or electrolytic methods, allowing the fluid to self-generate the required nanobubbles without requiring separate complex preparation systems, thus reducing overall system complexity.
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
CO2 nanobubbles increase the effectiveness of well stimulation by penetrating pores inaccessible to larger bubbles, enhance condensate flow, and reduce formation damage, while maintaining similar viscosity and density to the stimulation fluid, facilitating easy injection and flowback.
Implementation Method 1
leveraging their stability and energy delivery for effective wellbore region treatment
Implementation Method 2
penetrating pores inaccessible to larger bubbles
Implementation Method 3
CO2 is an efficient solvent for removing formation damage and condensate banking around the wellbore. This is attributed to the CO2 being miscible with the condensate
Implementation Method 4
enhance condensate flow
Implementation Method 5
leveraging their stability and energy delivery for effective wellbore region treatment
Data Source
AI summary
A composition and methods are provided for stimulating a well with nanobubbles. An exemplary method includes obtaining a stimulation fluid and generating a nanobubbles solution, wherein the nanobubbles solution includes nano-sized bubbles in the stimulation fluid. The nanobubbles solution is injected into the oil well.