Precursor Scavenger Materials for In-Situ Wellbore Sulfide Removal
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Solution Overview
Problem
Current scavenging methods for hydrogen sulfide and mercaptans in wellbores face issues such as non-volatile byproduct formation, fouling, corrosion, environmental concerns, compatibility issues, poor reaction kinetics, and high costs, while existing scavenger materials pose health risks and have limited efficiency at high sulfide loadings.
Innovation Solution
A method involving the use of a precursor scavenger material, such as an acetal or hydroxyaldehyde, which reacts in-situ within the wellbore to form a more reactive scavenger material like propenal, effectively reducing hydrogen sulfide and mercaptan concentrations by reacting with these species upon exposure to acidic conditions or water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional scavenger materials (formaldehyde-based, organic scavengers, metal-based scavengers) are used, then sulfur-containing materials can be scavenged, but non-volatile byproducts form causing fouling and blockage
Solution Approach 1:
The invention extracts the problematic non-volatile components from the scavenging process by using volatile scavenger materials that produce volatile reaction products. The scavenger material is selected to ensure that both the reactants and products remain volatile, effectively removing the harmful non-volatile byproducts from the system.
Solution Approach 2:
The invention converts the potential harm of byproduct formation into a benefit by selecting scavenger materials that produce volatile, easily removable reaction products. The byproducts, rather than causing fouling and blockage, become volatile substances that can be safely vented or processed.
2Productivity
If high concentrations of scavenger material are used to handle high sulfide loadings, then scavenging efficiency improves, but cost increases and compatibility issues with other wellbore materials arise
Solution Approach 1:
The invention changes the chemical parameters of the scavenger material by selecting volatile compounds with specific properties (low molecular weight, high vapor pressure) that provide high scavenging efficiency at lower concentrations. This parameter optimization maintains effectiveness while improving compatibility with other wellbore materials.
Solution Approach 2:
The invention applies local quality by selecting scavenger materials with specific volatile characteristics suited for particular wellbore conditions. Different volatile scavenger materials can be selected based on local requirements such as temperature, pressure, and specific sulfur compound concentrations.
3Speed
If reactive scavenger materials are used to improve reaction kinetics, then scavenging speed increases, but corrosion of wellbore equipment occurs
Solution Approach 1:
The invention uses volatile scavenger materials that are consumed in the scavenging reaction and then removed from the system as volatile products. These short-lived materials perform their scavenging function quickly and then disappear, preventing long-term corrosion issues associated with residual reactive materials.
Solution Approach 2:
The invention extracts the corrosive potential from the system by ensuring that both the scavenger material and its reaction products are volatile and can be completely removed. This prevents the accumulation of corrosive residues that would otherwise damage wellbore equipment.
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 in-situ formed scavenger material efficiently reacts with hydrogen sulfide and mercaptans, reducing corrosion and health risks, while being more environmentally friendly and cost-effective compared to traditional scavenger materials.
Implementation Method 1
reacting the precursor scavenger material in the wellbore or the earth formation in-situ to form a scavenger material comprising propenal
Implementation Method 2
reacting the precursor scavenger material in the wellbore or the earth formation in-situ to form a scavenger material comprising propenal, and reacting the scavenger material with at least one of hydrogen sulfide or a mercaptan
Data Source
AI summary
A method for applying a scavenger material to a wellbore includes providing a precursor scavenger material to a location within a wellbore extending through an earth formation, the precursor scavenger material comprising an acetal or a hydroxyaldehyde, reacting the precursor scavenger material in the wellbore or the earth formation in-situ to form a scavenger material comprising propenal, and reacting the scavenger material with at least one of hydrogen sulfide or a mercaptan to reduce a concentration of the at least one of hydrogen sulfide or the mercaptan. Related methods and systems for applying the scavenger material to the wellbore are also disclosed.