Layered Triple Hydroxide Drilling Fluid for H2S Scavenging
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Solution Overview
Problem
Existing methods for scavenging hydrogen sulfide (H2S) from subterranean geological formations during oil and gas drilling operations are inefficient, environmentally detrimental, and financially taxing, posing safety and operational challenges due to H2S's toxicity and corrosiveness.
Innovation Solution
A method using a drilling fluid suspension containing a layered triple hydroxide material composed of manganese, cobalt, and iron, with a pH of 10 or more, which scavenges H2S by reacting with it to convert it into elemental sulfur and insoluble sulfides, enhancing rheological properties and extending breakthrough and saturation times.
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 composition (Mn, Co, Fe) and controlled pH (10 or more), which fundamentally alters the scavenging mechanism compared to conventional oxidants, achieving efficient H2S removal while reducing environmental harm and cost
Solution Approach 2:
The invention employs a composite layered triple hydroxide material containing multiple metals (manganese, cobalt, iron) in specific ratios, combining the advantages of different metal hydroxides to achieve superior H2S scavenging performance, extended breakthrough time, and maintained rheological properties
2Duration of action of moving object
If drilling fluid suspension with layered triple hydroxide material is used, then breakthrough time increases by 5 to 10 times, but the drilling fluid composition becomes more complex
Solution Approach 1:
The layered triple hydroxide material serves multiple functions simultaneously: it acts as an H2S scavenger, maintains drilling fluid rheological properties, and provides extended breakthrough time, eliminating the need for separate additives and simplifying the overall system despite the complex material composition
3Reliability
If H2S scavenging agents are added to drilling fluid, then H2S removal efficiency improves, but rheological properties may be affected
Solution Approach 1:
The patent specifies a pH of 10 or more for the drilling fluid suspension, which optimizes the performance of the layered triple hydroxide material while maintaining the rheological stability of the drilling fluid, preventing degradation of polymers and starches
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 improves H2S scavenging efficiency, increasing breakthrough and saturation times by 5 to 10 times and 1 to 3 times, respectively, while maintaining improved rheological properties of the drilling fluid, thus ensuring safer and smoother 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
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, cobalt, 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.