Alkaline Layered Hydroxide Mud for Wellbore H2S Scavenging
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Solution Overview
Problem
Existing methods for scavenging hydrogen sulfide (H2S) from subterranean geological formations during drilling operations are inefficient, environmentally detrimental, and financially taxing, posing safety and operational challenges.
Innovation Solution
A method using a layered triple hydroxide material, comprising manganese, zinc, and iron, in an aqueous drilling fluid suspension with a pH of 10 or more, to scavenge H2S by forming a water-based mud and reacting H2S with the material, enhancing rheological properties and improving drilling fluid performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional H2S scavenging methods (chlorine dioxide, calcium hypochlorite, iron chelates) are used, then H2S removal is achieved, but the methods are inefficient, environmentally detrimental, and financially taxing
Solution Approach 1:
The patent changes the chemical parameters by using a layered triple hydroxide material with specific metal compositions (Mn, Zn, Fe) and controlling pH to 10 or more, creating a more efficient and environmentally friendly scavenging system that outperforms conventional methods
Solution Approach 2:
The patent employs a composite layered triple hydroxide material containing multiple metals (manganese, zinc, iron) in specific ratios, which provides superior H2S removal efficiency and environmental performance compared to single-component scavengers
2Reliability
If existing scavenging materials are used, then H2S is removed, but breakthrough and saturation times are short and H2S adsorption capacity is limited
Solution Approach 1:
The layered triple hydroxide material utilizes its porous structure to provide extended breakthrough and saturation times, allowing continuous H2S adsorption capacity to be maintained for longer durations compared to conventional scavenging materials
3Productivity
If standard drilling fluids are used, then drilling operations proceed, but rheological properties are insufficient and drilling efficiency is reduced
Solution Approach 1:
The layered triple hydroxide material serves multiple functions: it acts as an H2S scavenger, enhances the rheological properties of the drilling fluid, and improves drilling efficiency, making it a multi-functional additive that addresses multiple challenges simultaneously
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 method significantly extends breakthrough and saturation times, increases H2S adsorption capacity, and improves rheological properties of the drilling fluid, leading to safer and more efficient drilling operations.
Implementation Method 1
scavenging the hydrogen sulfide from the subterranean geological formation by reacting the hydrogen sulfide with the layered triple hydroxide material in the water-based mud
Implementation Method 2
increases H2S adsorption capacity
Data Source
AI summary
A method of removing hydrogen sulfide from a subterranean geological formation includes injecting a drilling fluid suspension in the subterranean geological formation. The drilling fluid suspension has a pH of 10 or more and includes a layered triple hydroxide material, including manganese, zinc, and iron, in an amount of 0.01 to 0.5 precent by weight of the drilling fluid suspension. The method further includes circulating the drilling fluid suspension in the subterranean geological formation and forming a water-based mud and scavenging the hydrogen sulfide from the subterranean geological formation by reacting the hydrogen sulfide with the layered triple hydroxide material in the water-based mud.