Scavenger Sampling Chamber for H2S Quantification
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Solution Overview
Problem
Current methods for detecting hydrogen sulfide (H2S) in wellbore fluids face challenges such as its volatility, corrosiveness, and reactivity with surfaces, leading to undetectable small amounts and unclear origin within formations, posing safety hazards and operational inefficiencies.
Innovation Solution
A fluid sampling tool equipped with a scavenger, such as metals or organic compounds, that reacts quantitatively with H2S in situ, allowing for accurate concentration measurement by analyzing byproducts or remaining scavenger, enabling precise location-based detection within formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for H2S in wellbore fluids, then detection capability is limited, but H2S volatility and reactivity cause it to become undetectable before reaching surface equipment
Solution Approach 1:
The patent applies preliminary action by capturing H2S in situ within the formation using a scavenger material before the gas can volatilize or react with wellbore surfaces. The scavenger is positioned in the sampling chamber to immediately react with and trap H2S as it enters from the formation, ensuring the gas is captured at its source rather than allowing it to escape during transport to the surface.
Solution Approach 2:
The patent uses a scavenger material as an intermediary substance that mediates between the H2S gas and the detection system. The scavenger chemically reacts with H2S to form a stable complex, converting the volatile and reactive H2S gas into a detectable form that can be measured by analyzing the scavenger's properties or the reaction products.
2Object-affected harmful factors
If H2S is allowed to react with wellbore surfaces during transport, then safety hazards are reduced, but H2S concentration cannot be accurately determined and origin cannot be identified
Solution Approach 1:
The patent extracts H2S from the wellbore fluid stream by using a scavenger material that selectively binds H2S molecules. The scavenger is placed in the sampling chamber to pull H2S out of the flowing fluid, concentrating it in a detectable form while leaving the rest of the fluid to continue flowing, thus preventing H2S from reaching and reacting with surface equipment.
Solution Approach 2:
The patent replaces mechanical transport of H2S gas through wellbore equipment with a chemical capture mechanism. Instead of relying on physical conveyance that exposes H2S to reactive surfaces, the system uses chemical reaction between the scavenger and H2S to transfer and contain the gas in a controlled, measurable state within the sampling chamber.
3Reliability
If small amounts of H2S are present in formation fluids, then formation safety is improved, but H2S becomes undetectable by conventional methods
Solution Approach 1:
The patent changes the detection parameter from direct H2S gas measurement to measurement of the scavenger's chemical properties or reaction products. By converting trace amounts of H2S into a stable chemical complex with the scavenger, the system transforms an undetectable parameter (trace gas concentration) into a measurable parameter (scavenger composition or reaction product concentration).
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
Enables reliable, real-time determination of H2S concentrations at specific locations, preventing damage and ensuring operator safety by quantifying H2S before it reacts, even in small quantities, and identifying concentration gradients.
Implementation Method 1
a scavenger, such as metals or organic compounds, that reacts quantitatively with H2S in situ
Data Source
AI summary
Systems, methods and devices for analyzing a sample of fluid extracted from a hydrocarbon-producing geological formation to detect a quantitative amount of hydrogen sulfide or disclosed. The systems methods and devices involve including a scavenger within a sample compartment to react with the hydrogen sulfide therein. The concentration of hydrogen sulfide in the sample may be derived as a function of the amount of scavenger remaining in the sample after reaction with hydrogen sulfide, an amount of byproduct of a reaction between the scavenger and the hydrogen sulfide, or an amount of hydrogen sulfide as measured following a secondary reaction that releases the hydrogen sulfide from the scavenger.