Reversible Aminal Gel for H2S Mitigation and Formation Damage Control
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Solution Overview
Problem
Conventional gels used in oil and gas recovery operations often cause formation damage and are difficult to remove, leading to reduced permeability and production issues, especially in high-temperature and high-pressure well environments, and they lack effective solutions for hydrogen sulfide (H2S) mitigation.
Innovation Solution
Development of reversible aminal gels produced from the condensation of aldehydes and amines, which are responsive to pH changes and metal salts, allowing for controlled phase transitions and self-healing properties, and incorporating triazine compounds for enhanced thermal stability and H2S mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gels are used in oil and gas recovery operations, then fluid loss control is achieved, but formation damage occurs and permeability is reduced
Solution Approach 1:
The patent employs pH-responsive gel systems where the gelation and degelation transitions are controlled by pH changes. The gel is formed at lower pH values and degraded at higher pH values, allowing reversible control of fluid loss control while minimizing formation damage through complete reversibility and lack of residual damage.
Solution Approach 2:
The patent utilizes phase transition behavior of hemiaminal and aminal gels, which can reversibly transition between gel and sol states in response to pH changes. This phase transition mechanism enables the gel to provide fluid loss control when needed and then revert to a non-damaging state, eliminating permanent formation damage.
2Reliability
If conventional gels are used in high-temperature well environments, then fluid loss control is maintained, but the gels are difficult to remove and cause production issues
Solution Approach 1:
The patent uses pH-responsive gel systems that can be controlled to form and degrade based on pH changes. The gel remains stable at the wellbore temperature but can be selectively degraded by pH adjustment, making removal easy and complete without leaving residues that would cause production issues.
Solution Approach 2:
The patent employs gels that are designed to be temporary and completely degradable. The hemiaminal and aminal gels are intended to perform their fluid loss control function and then be completely removed through pH-induced degradation, leaving no permanent damage or residues, similar to disposable materials that are discarded after use.
3Reliability
If conventional gels are used, then fluid loss control is achieved, but H2S mitigation is not effectively addressed
Solution Approach 1:
The patent incorporates triazine compounds into the gel system, creating a composite material that combines the fluid loss control properties of the hemiaminal/aminal gel with the H2S mitigation capabilities of triazine compounds. This composite approach allows simultaneous achievement of fluid loss control and H2S mitigation.
Solution Approach 2:
The patent develops a gel system that performs multiple functions: fluid loss control, H2S mitigation, and reversible degradation. The hemiaminal/aminal gel framework combined with triazine compounds enables a single material to address multiple wellbore challenges simultaneously, including H2S exposure and fluid loss control.
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 reversible aminal gels provide a solution for reducing formation damage by maintaining high thermal stability, enabling controlled gelation and degelation, and effectively mitigating H2S, thus improving oil well construction and production processes.
Implementation Method 1
The liquid precursor composition transitions from the liquid state to a gel state responsive to an increase in temperature from the hydrocarbon-bearing reservoir
Implementation Method 2
the gel state is operable to return to the liquid state responsive to a change in the hydrocarbon-bearing reservoir selected from the group consisting of: a decrease in pH in the hydrocarbon-bearing reservoir
Implementation Method 3
The liquid precursor composition comprises: an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a metal salt composition with valence 3, 4, or 5
Data Source
AI summary
A well treatment composition for use in a hydrocarbon-bearing reservoir, optionally as a kill pill, and comprising a reversible aminal gel composition. The reversible aminal gel composition includes a liquid precursor composition. The liquid precursor composition is operable to remain in a liquid state at about room temperature. The liquid precursor composition comprises an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a metal salt composition. The liquid precursor composition transitions from the liquid state to a gel state responsive to an increase in temperature in the hydrocarbon-bearing reservoir. The gel state is stable in the hydrocarbon-bearing reservoir at a temperature similar to a temperature of the hydrocarbon-bearing reservoir, and the gel state is operable to return to the liquid state responsive to a change in the hydrocarbon-bearing reservoir selected from the group consisting of: a decrease in pH in the hydrocarbon-bearing reservoir and an addition of excess metal salt composition in the hydrocarbon-bearing reservoir.