Biocide Composition for Reservoir Souring Control
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Solution Overview
Problem
There is a continuous demand for effective and cost-efficient biocides to control the proliferation of undesired bacteria in oil and gas applications, particularly in hydraulic fracturing and oil field reservoir treatments to prevent reservoir souring.
Innovation Solution
A well treatment biocide composition comprising a tetrakis(hydroxyorgano)phosphonium salt (THP salt) and 1,3-dimethylol-5,5-dimethylhydantoin, which provides a fast kill and long-term preservation of the treated area, while also enhancing biofilm control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional biocides are used to control bacterial proliferation, then bacterial growth is inhibited, but the treatment lacks long-term preservation and effective biofilm control
Solution Approach 1:
The patent combines two distinct biocidal mechanisms into a single composition: a phosphonium salt for immediate bacterial cell destruction and a hydantoin compound for sustained slow-release biocidal activity. This merging allows the composition to achieve both rapid initial kill and long-term preservation, resolving the contradiction between immediate effectiveness and duration of action.
Solution Approach 2:
The invention uses a composite biocide system where the phosphonium salt and hydantoin compound work synergistically. The phosphonium salt provides rapid contact killing while the hydantoin offers prolonged residual protection, creating a composite effect that simultaneously addresses both short-term and long-term biocidal needs.
2Speed
If conventional biocides are applied to achieve fast kill, then immediate bacterial death is achieved, but biofilm control and reservoir souring prevention are insufficient
Solution Approach 1:
The composition merges the fast-acting phosphonium salt with the biofilm-penetrating hydantoin compound. The phosphonium salt delivers rapid kill of planktonic bacteria while the hydantoin component maintains effective concentrations within biofilms over time, achieving both speed and reliability in biofilm control.
3Ease of operation
If single-component biocides are used to simplify treatment, then application is easier, but effectiveness against diverse bacteria and biofilms is reduced
Solution Approach 1:
The biocide composition is designed with multi-functionality: the phosphonium salt component targets a broad spectrum of bacteria including Gram-positive and Gram-negative species, while the hydantoin compound provides additional spectrum coverage and biofilm penetration capabilities. This universal approach allows a single composition to effectively treat diverse bacterial challenges without requiring multiple separate treatments.
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 composition achieves a fast kill and long-term preservation of the treated area, effectively controlling bacterial growth and preventing reservoir souring, with enhanced biofilm control.
Implementation Method 1
Biocides are used to treat water and destroy bacteria or a substantial amount of bacteria during a biocide treatment
Implementation Method 2
enhanced biofilm control to prevent or mitigate reservoir souring
Data Source
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AI summary
A well treatment fluid composition that includes a tetrakis(hydroxyorgano)phosphonium salt and 1,3-dimethylol-5,5-dimethylhydantoin. Methods for preparing a well treatment fluid composition and treating a subterranean formation are also presented.