Methylmorpholine-N-oxide H2S Removal Downhole
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Solution Overview
Problem
Current methods for removing hydrogen sulfide from hydrocarbon fluids in oil and gas fields face challenges such as reversible reactions, foaming issues, and the production of harmful by-products, making them inefficient and costly, particularly in downhole applications.
Innovation Solution
A method involving a methylmorpholine-N-oxide solution is used to irreversibly convert hydrogen sulfide into elemental sulfur, minimizing side reactions and avoiding regeneration, with the solution being a mild oxidizer that is stable across various temperatures and not producing excessive foaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strong oxidizers such as permanganate or peroxides are used to remove hydrogen sulfide, then hydrogen sulfide is effectively converted to harmless sulfur forms, but harmful side reactions with hydrocarbon components occur and harmful by-products such as chlorine or solid manganese dioxide are generated
Solution Approach 1:
The patent changes the oxidation strength parameter by using a mild oxidizing agent (iodine or iodine-containing compounds) instead of strong oxidizers. This parameter change allows effective hydrogen sulfide conversion to elemental sulfur while avoiding harmful side reactions with hydrocarbons and preventing generation of harmful by-products like chlorine or solid manganese dioxide.
Solution Approach 2:
The patent employs iodine or iodine-containing compounds as a disposable mild oxidizing agent that can be introduced downhole, react with hydrogen sulfide, and be subsequently disposed of or regenerated, avoiding the accumulation of harmful residues associated with strong oxidizers.
2Reliability
If long chain amine oxides are used to remove hydrogen sulfide, then hydrogen sulfide is converted to water soluble forms, but excessive foaming occurs due to surfactancy and large treatment volumes are required
Solution Approach 1:
The patent changes the chemical nature of the oxidizing agent from long-chain amine oxides (surfactants) to iodine or iodine-containing compounds, which do not exhibit surfactant properties. This eliminates excessive foaming and reduces the treatment volume required for effective hydrogen sulfide removal.
3Reliability
If peroxide is used to remove hydrogen sulfide, then hydrogen sulfide is oxidized to sulfur forms, but rapid decomposition occurs at elevated temperatures and pH above 7, which are typical in oilfield applications
Solution Approach 1:
The patent changes the thermal and pH stability parameters by selecting iodine or iodine-containing compounds as the oxidizing agent. These compounds maintain stability at elevated temperatures and across a broader pH range compared to peroxide, making them suitable for typical oilfield application conditions.
4Reliability
If nitrite oxidation is used to remove hydrogen sulfide, then hydrogen sulfide is converted to sulfur forms, but ammonia by-product accumulates and pH rises, potentially stalling the oxidation before completion
Solution Approach 1:
The patent changes the reaction stoichiometry and by-product profile by using iodine or iodine-containing compounds instead of nitrite. This eliminates ammonia generation and pH rise issues, allowing complete oxidation of hydrogen sulfide to elemental sulfur without self-inhibition.
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 effectively reduces hydrogen sulfide levels in hydrocarbon fluids, ensuring stability and safety by producing elemental sulfur without harmful by-products, and is cost-effective compared to other oxidizing chemicals.
Implementation Method 1
allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide to remove the hydrogen sulfide
Data Source
AI summary
A method and system remove hydrogen sulfide from a sour liquid. In an embodiment, the method for removing hydrogen sulfide from a hydrocarbon containing fluid includes contacting a methylmorpholine-N-oxide solution with the sour liquid. The method also includes allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide to remove the hydrogen sulfide.