Modified Acid Composition for High-Temperature Oil Well Stimulation
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Solution Overview
Problem
The oil & gas industry faces challenges with conventional mineral acids, including high corrosion rates, environmental hazards, toxicity, and logistical issues, particularly at high temperatures, which affect the safety and efficiency of acid-based operations.
Innovation Solution
A modified acid composition combining hydrochloric acid with alkanolamines in specific molar ratios, providing stability up to 190°C, reduced corrosion, and improved safety, while maintaining performance comparable to conventional acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional mineral acids (e.g., hydrochloric acid) are used for acidizing operations, then effective dissolution of carbonate formations and scale removal is achieved, but extremely high corrosion rates and environmental hazards occur
Solution Approach 1:
The patent uses alkanolamines as intermediary substances that complex with metal ions (Ca2+, Mg2+, Fe2+) to form soluble chelates, replacing the direct aggressive action of mineral acids. This intermediary mechanism achieves scale removal and formation dissolution while significantly reducing corrosion and environmental harm.
Solution Approach 2:
The invention changes the chemical parameters from strong mineral acids to milder alkanolamine-based compositions, altering the mechanism of action from direct proton attack to chelation and complex formation, thereby maintaining effectiveness while reducing harmful effects.
2Productivity
If hydrochloric acid is used to stimulate production, then permeability is increased through formation dissolution, but toxic hydrogen chloride gas is released which is immediately dangerous to life and health
Solution Approach 1:
The patent converts the harmful property of alkanolamines (milder reactivity) into a benefit by eliminating toxic gas release, while maintaining the beneficial effect of formation stimulation through alternative mechanisms like chelation and controlled dissolution.
3Object-affected harmful factors
If filming corrosion inhibitors are added to counter corrosion, then corrosion protection is provided, but the inhibitors are toxic and harmful to humans, wildlife, and the environment
Solution Approach 1:
The invention extracts and removes the need for separate corrosion inhibitor additives by fundamentally changing the base composition to alkanolamines, which inherently provide corrosion protection through their chemical structure and mechanism of action, eliminating the source of inhibitor toxicity.
4Productivity
If conventional acids are used for scale treatment, then scale removal is achieved, but extensive emergency evacuation plans and expensive safety infrastructure are required
Solution Approach 1:
The patent employs a composition system that is inherently safer and does not require long-term, expensive safety infrastructure or complex emergency evacuation plans, effectively replacing the need for such elaborate protective measures while maintaining scale removal effectiveness.
5Temperature
If mineral acids are used in high temperature operations, then acidizing can be performed, but reaction rates become unpredictable and corrosion control becomes difficult
Solution Approach 1:
The invention changes the chemical composition parameters to alkanolamine-based systems that exhibit more stable and predictable reaction kinetics across a wide temperature range, eliminating the uncontrollable reaction rates and corrosion issues associated with conventional mineral acids at high temperatures.
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 modified acid composition offers enhanced thermal stability, lower corrosion rates, and improved safety, enabling effective use in various oil & gas operations without the drawbacks of conventional acids, such as reduced environmental impact and safer handling.
Implementation Method 1
When added to hydrochloric acid a Lewis acid/base adduct is formed where the primary amino group acts as a Lewis base and the proton of the HCl as Lewis acid.
Implementation Method 2
the acids dissolve the sediments formation and/or mud solids that are inhibiting the permeability of the rock, enlarging the natural pores of the reservoir (wormholing) and stimulating the flow of hydrocarbons to the wellbore
Implementation Method 3
fracture acidizing involves pumping acid into the well at a very high pressure, physically fracturing the reservoir rock and etching the acid reactive portion of the formation. This type of acid treatment forms channels or acid etched fractures through which the hydrocarbons can flow
Data Source
AI summary
An aqueous modified acid composition for industrial activities, said composition comprising: an alkanolamine and strong acid in a molar ratio of not less than 1:15, preferably not less than 1:10; it can also further comprise a metal iodide or iodate. Said composition demonstrates advantages over known conventional acids and modified acids.