Magnetic Core Nanoparticles with Carbon Shell for Downhole pH Monitoring
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Solution Overview
Problem
Current methods for monitoring subterranean formation conditions and enhancing hydrocarbon productivity are limited by the instability and toxicity of existing pH monitoring nanoscale chemicals, which are inaccurate and short-lived under high-pressure, high-temperature conditions.
Innovation Solution
Development of spherical nanoparticles with a magnetic core, a carbon shell, and a luminescent amorphous carbon nitride coating, functionalized with organic groups, which are stable and can be used to enhance hydrocarbon recovery by providing accurate monitoring of formation conditions and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dyes are used as nanosize chemicals for pH monitoring, then the monitoring function is provided, but the chemical stability under formation conditions deteriorates
Solution Approach 1:
The patent uses composite materials by encapsulating the dye molecule within a nanoscale core-shell structure consisting of a magnetic core and a carbon shell. This composite structure protects the chemically unstable dye from degradation under formation conditions while maintaining its pH monitoring function through optical property changes.
Solution Approach 2:
The carbon shell acts as a protective flexible barrier that encapsulates the dye molecule, shielding it from harsh formation conditions (high temperature, high pressure, acidic environments) while allowing the dye to maintain its chemical sensing capability for pH monitoring.
2Measurement precision
If fluorophores are used as nanosize chemicals, then the monitoring capability is enhanced, but the duration of action deteriorates due to photobleaching and photo blinking
Solution Approach 1:
The carbon shell provides a protective environment that shields the fluorophore from photodegradation mechanisms such as photobleaching and photo blinking, thereby extending the operational lifetime and duration of action of the fluorescent marker under downhole conditions.
Solution Approach 2:
The carbon shell creates an inert protective environment around the fluorophore, isolating it from reactive species and harsh conditions that cause photodegradation, thus maintaining fluorescence stability and extending the monitoring duration.
3Measurement precision
If conventional pH monitoring methods are used, then the pH measurement is obtained, but the accuracy deteriorates due to pH changes during sample retrieval
Solution Approach 1:
The patent replaces conventional mechanical/chemical pH measurement methods with optical property-based detection. The nanoscale chemical's optical properties change in response to pH, allowing non-intrusive, in-situ measurement that does not require sample retrieval or mechanical intervention, thereby maintaining accuracy.
Solution Approach 2:
The nanoscale chemical acts as an intermediary sensor that translates pH information into detectable optical signals. This intermediary mechanism allows accurate pH measurement without direct contact with harsh formation conditions affecting the measurement apparatus, preserving measurement accuracy.
4Difficulty of detecting and measuring
If toxic and radioactive fluorophores are used, then the fluorescence detection is enabled, but harmful factors to the formation increase
Solution Approach 1:
The patent extracts or removes the harmful toxic and radioactive components from the fluorophore system while retaining the essential fluorescence detection capability through the use of safe, non-toxic fluorescent markers encapsulated in the protective nanoscale structure.
Solution Approach 2:
The patent converts the potentially harmful fluorophore system into a beneficial, safe monitoring tool by using non-toxic, non-radioactive fluorescent markers that provide the same detection function without the harmful side effects to the formation and environment.
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 nanoparticles provide stable and accurate monitoring of subterranean formation conditions and enhance hydrocarbon productivity by being resistant to pH changes and photobleaching, allowing for prolonged use and improved data accuracy.
Implementation Method 1
a luminescent amorphous carbon nitride coating encapsulating the functionalized carbon shell
Implementation Method 2
a magnetic core of iron, nickel or cobalt or an alloy thereof
Implementation Method 3
a carbon shell encapsulating the magnetic core
Data Source
AI summary
Nanoparticles for use in the treatment of a well have a magnetic core of iron, nickel or cobalt or an alloy thereof; a carbon shell encapsulating the magnetic core; at least one organic functional group on the surface of the carbon shell through covalent bonding; and a coating of amorphous carbon nitride encapsulating the functionalized carbon shell. The nanoparticles may be used to identify fluids produced from the reservoir, identify the zone within the reservoir from which recovered fluid is produced, in water flooding to determine water breakthrough in the production well and to identify those injection wells from which breakthrough water originates.