Iodide Stabilizer for Iron-Rich Fracturing Fluids
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Solution Overview
Problem
The use of non-traditional water sources in well treatment fluids, such as produced water, often contains high concentrations of iron ions, which can catalyze the breaking of viscosity-increasing polymers, leading to undesirable rapid viscosity reduction and affecting the performance of fracturing fluids.
Innovation Solution
Incorporating a source of iodide ions, such as potassium iodide, into the aqueous phase of the treatment fluid to inhibit the catalytic effect of iron ions, thereby stabilizing the viscosity of the fluid and delaying the breaking process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-traditional water sources containing iron ions are used in treatment fluids, then cost is reduced and water availability is improved, but viscosity stability deteriorates due to iron-catalyzed polymer breakdown
Solution Approach 1:
Iodide ions are introduced as an intermediary substance that interferes with the catalytic activity of iron ions. The iodide ions bind to iron ions or compete for reaction sites, preventing iron from catalyzing polymer breakdown. This mediator approach allows the use of iron-containing water sources while maintaining viscosity stability through chemical interference rather than removal of iron.
Solution Approach 2:
The invention converts the harmful catalytic effect of iron ions into a beneficial or neutral effect by adding iodide ions that specifically interact with iron. The iron ions, which would normally accelerate polymer degradation, are instead sequestered or neutralized by iodide, transforming a detrimental component into a controlled system where iron's presence no longer compromises fluid stability.
2Stability of the object's composition
If iron ions are removed from water sources, then viscosity stability is improved, but cost increases and process complexity increases
Solution Approach 1:
Instead of extracting or removing iron ions from the water source through complex treatment processes, the invention takes a different approach by introducing iodide ions that neutralize iron's harmful effects in situ. This avoids the need for iron removal equipment, filtration systems, or additional processing steps, thereby maintaining simplicity while achieving viscosity stability.
3Adaptability or versatility
If iron ions are present in treatment fluid, then water source selection is expanded, but polymer breakdown rate increases
Solution Approach 1:
Iodide ions are added to the treatment fluid in advance to prevent iron-catalyzed polymer breakdown before it can occur. The iodide-iron interaction happens preliminarily, creating a protective chemical environment that stops the degradation pathway at its inception, thereby extending polymer durability while allowing iron-containing water sources to be used.
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 addition of iodide ions effectively counters the rapid breaking caused by iron ions, allowing for controlled viscosity maintenance and improved performance of fracturing fluids, even when using water with high iron concentrations, without the need for costly iron removal processes.
Implementation Method 1
high concentrations of iron ions in an aqueous phase that may undesirably catalyze an oxidizer for breakage of the viscosity increasing polymer
Implementation Method 2
an oxidizer for breakage of the viscosity increasing polymer
Data Source
AI summary
A composition of a treatment fluid and method for treating a zone of well. In an embodiment, the composition includes at least: (i) an aqueous phase; (ii) at least 5 ppm iron ion in the aqueous phase; (iii) a source of at least 5 ppm iodide ion to be dissolved in the aqueous phase; (iv) a water-soluble viscosity-increasing agent dissolved in the aqueous phase; and (v) a source of an oxidative breaker to be dissolved in the aqueous phase. In an embodiment, a method of treating a zone of a subterranean formation of a well includes at least the steps of: (a) forming a treatment fluid according to the composition; and (b) introducing the treatment fluid into the zone.