Cation Exchange Resin Regeneration Using High Salinity Brine
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Solution Overview
Problem
In oil fields, especially those in extreme climates, traditional methods for softening injection water to reduce multivalent cations like calcium and magnesium are impractical due to the large amounts of sodium chloride required for regeneration, making the process uneconomic.
Innovation Solution
A method involving a cation exchange resin process where source water with high multivalent cation content is treated with a naturally occurring high salinity brine as the regenerating solution, allowing for continuous production of softened injection water with reduced multivalent cation content, and efficient resin regeneration without the need for excessive sodium chloride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional ion exchange softening method is used to reduce multivalent cation content in injection water, then the multivalent cation concentration is reduced (improving oil recovery), but large amounts of sodium chloride are required for resin regeneration (increasing operational costs and complexity)
Solution Approach 1:
The invention changes the chemical composition parameters of the regenerating brine by using naturally occurring high salinity water with specific ion ratios (high monovalent cations and low multivalent cations) instead of traditional sodium chloride solution, thereby reducing sodium chloride consumption while maintaining resin regeneration effectiveness
Solution Approach 2:
The invention utilizes naturally occurring high salinity water from the oil field environment itself as the regenerating agent, allowing the system to softening injection water using locally available resources without requiring external sodium chloride supply chains
2Productivity
If traditional ion exchange softening method is used, then softened injection water is produced (enhancing oil recovery), but the complexity of handling and disposing large amounts of sodium chloride increases
Solution Approach 1:
The system uses naturally occurring high salinity water already present in the oil field environment as the regenerating agent, eliminating the need for external sodium chloride handling, storage, and disposal infrastructure
Solution Approach 2:
The naturally occurring high salinity water serves multiple functions: it acts as the regenerating agent for the ion exchange resin and the produced brine can be disposed of through existing oil field waste water management systems, reducing the need for separate handling systems
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
This method effectively reduces multivalent cation content in injection water, enhancing oil recovery from hydrocarbon-bearing formations by maintaining resin effectiveness and reducing operational costs associated with sodium chloride handling.
Implementation Method 1
Ion exchange is a process whereby a water solution is passed through a bed of a material that replaces one kind of ion in solution with another kind of like charge. Such materials are known as ion exchange resins. Commercial and industrial water softeners generally contain cation-exchange resins for displacing one cation for another.
Implementation Method 2
Once the resin has been substantially converted to a multivalent cation form (in particular, calcium and/or magnesium form), it can be regenerated by flushing the bed with a concentrated solution of sodium chloride to reverse the previous reaction.
Data Source
AI summary
A method for generating softened injection water (A) (i) introducing source water having a dissolved solids content of up to 15,000 mg/liter and a multivalent cation content of greater than 40 mg/liter to a bed of cation exchange resin in monovalent cation form, (ii) passing the water through the bed so that at least a portion of the multivalent cations in the water are replaced by monovalent cations from the resin, and (iii) withdrawing the softened injection water having a multivalent cation content of up to 40 mg/liter; (B) regenerating the cation exchange resin by (i) introducing a regenerating brine to the vessel, (ii) passing the brine through the bed and (iii) withdrawing a brine containing displaced multivalent cations, wherein the brine is a naturally occurring high salinity water having a concentration of cations such that the Softening Limit for the source water is up to 40 mg/liter of multivalent cations.