H2S Release Capacity Screening via Purge-and-Trap Analysis
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Solution Overview
Problem
Current methods for assessing H2S release capacity from liquid samples containing sulfur compounds in the oil and gas industry are inadequate, as they do not accurately simulate real storage conditions and are cumbersome, time-consuming, and lack the ability to quickly identify additives with the lowest H2S release capacity.
Innovation Solution
A method involving a purge vessel where a liquid sample is heated and purged with an inert gas stream, with the gaseous phase passed through a H2S trap and the trapped H2S recovered and analyzed using techniques like gas chromatography coupled with mass spectrometry, allowing for rapid and safe assessment of H2S release capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If closed flask experiments are used to analyze H2S degradation products, then H2S concentration can be measured, but the results do not represent real stock tank conditions where H2S is continuously evacuated
Solution Approach 1:
A purge gas stream (nitrogen or helium) is introduced as an intermediary to continuously sweep H2S from the liquid sample through a headspace, simulating the continuous evacuation conditions of a stock tank while enabling measurement. The purge gas acts as a mediator between the closed system and open system conditions.
Solution Approach 2:
The liquid sample is pre-heated to a controlled temperature (e.g., 50°C) before the purge operation to accelerate H2S generation and ensure consistent degradation conditions. This preliminary heating step establishes uniform thermal conditions that mimic stock tank storage temperatures.
2Measurement precision
If gas chromatography analysis is performed on degradation products, then H2S quantity can be determined, but the process is time-consuming and requires trained operators
Solution Approach 1:
H2S is extracted from the liquid sample matrix by purging with an inert gas stream, concentrating it in the gas phase for direct analysis. This extraction separates the target analyte from the complex liquid formulation, enabling faster and simpler detection.
Solution Approach 2:
The complex manual sampling and analysis process is replaced by an automated purge-and-trap system coupled with gas chromatography, reducing operator intervention and analysis time while maintaining measurement precision.
3Measurement precision
If manual sampling and analysis steps are performed, then H2S degradation products can be analyzed, but safety risks increase due to handling dangerous substances
Solution Approach 1:
The entire analysis process is conducted in an inert atmosphere using nitrogen or helium as purge gas, preventing H2S from contacting the operator. The inert gas creates a safe environment that maintains measurement capability while eliminating safety hazards associated with direct H2S handling.
Solution Approach 2:
The inert purge gas serves as an intermediary carrier that transports H2S from the sample to the analysis instrument without requiring direct human contact with the toxic substance, thereby eliminating safety risks while preserving analytical capability.
4Measurement precision
If multiple analysis steps are performed to evaluate H2S release, then comprehensive data can be obtained, but the complexity and difficulty of operation increase
Solution Approach 1:
Multiple operations (heating, purging, trapping, and analysis) are merged into a single integrated purge-and-trap gas chromatography system that performs all steps automatically in sequence, maintaining comprehensive data collection while simplifying operator interaction to a single sample injection.
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 simulates real storage conditions, is faster and safer than existing methods, and enables the quick identification of liquid samples with the lowest H2S release capacity, facilitating the selection of suitable additives.
Implementation Method 1
Purging the gaseous phase with an inert gas stream
Implementation Method 2
Passing the purged gaseous phase through a H2S trap
Data Source
AI summary
The present invention relates to method for assessing the H2S release capacity of a liquid sample containing one or more sulfur compounds which are able to be degraded into gaseous H2S with temperature. The method comprising: a) Placing a volume of the liquid sample in a purge vessel so as to obtain a liquid phase and a gaseous phase in a flask; b) Purging the gaseous phase with an inert gas stream for a determined period of time; e) Passing the purged gaseous phase through a H2S trap; d) Recovering H2S from the H2S trap; and e) Dosing the recovered H2S. The invention is also used in a method for selecting a liquid sample, in particular among a group of different liquid samples.