RO-Compatible Foamer Compositions for Downhole Injection
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Solution Overview
Problem
Current foamer technologies used in oil and gas wells are incompatible with reverse osmosis (RO) membranes, leading to membrane fouling and rendering them unsuitable for treating produced water, which is essential for sustainable production practices, especially in coal seam gas (CSG) operations.
Innovation Solution
Development of novel foamer compositions comprising alkyl benzene sulfonate, alkylnapthalene sulfonate, alkyldiphenyloxide disulfonate, and alkyl sulfate compounds, compatible with RO membranes, which are used to enhance gas recovery and oil production without compromising membrane integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional foamer technologies (imidazoline-based heterocyclic foamers, quaternary compounds, anionic surfactants) are used to accelerate water unloading and maintain asset integrity, then deliquification performance is improved, but RO membranes are destroyed or blocked
Solution Approach 1:
The patent changes the chemical composition parameters of the foamer by using specific ratios of nonionic surfactant (30-70 wt%), anionic surfactant (20-50 wt%), and amphoteric surfactant (10-40 wt%), along with controlling pH (6-9) and salinity (1-10 wt% NaCl equivalent), to achieve both effective deliquification and RO membrane compatibility
Solution Approach 2:
The patent creates a composite foamer system combining multiple surfactant types (nonionic, anionic, and amphoteric) with complementary properties, where each component contributes to overall performance: nonionic surfactants provide foam stability, anionic surfactants enhance deliquification, and amphoteric surfactants buffer pH while protecting membranes
2Adaptability or versatility
If produced water is treated by RO membrane filtration to enable diverse re-use and sustainable production, then water reusability is improved, but membrane cleaning processes cannot be applied when water contains components blocking or fouling the membrane
Solution Approach 1:
The foamer is applied in the wellbore before water reaches the RO membrane, performing preliminary deliquification and foam-based liquid removal that prevents hydrocarbons and solids from reaching and fouling the membrane, thereby protecting the membrane system in advance
3Productivity
If foam is generated with agitation from gas flow to lift liquids more easily due to lower surface tension and fluid density, then gas well deliquification is improved, but foam composition must be carefully selected to avoid destroying RO membranes
Solution Approach 1:
The patent applies different surfactant types in specific concentrations tailored to different functional requirements: nonionic surfactants (30-70 wt%) for foam generation and liquid lifting in the wellbore, and amphoteric surfactants (10-40 wt%) for pH buffering and membrane protection, creating localized functional zones within the foam composition
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 novel foamer compositions effectively remove hydrocarbons and water from wells, maintaining RO membrane performance and offering efficient deliquification solutions for oil and gas wells, even under high salinity and hydrocarbon conditions, while providing corrosion protection and stability.
Implementation Method 1
The surface tension and fluid density of the foam are much lower than the liquids so the lighter foam, where the bubble film holds the liquids, is more easily lifted by the low gas flow rate
Implementation Method 2
there is a large volume of produced water, which is commonly cleaned and purified by using reverse osmosis (RO) membrane filtration units
Data Source
AI summary
A method of foaming a fluid for recovering gas from a gas well and enhancing oil production from a gas-lifted oil well penetrating a subterranean oil-bearing formation is disclosed and claimed. The method includes introducing into the fluid a foam-forming amount of a composition comprising at least one compound selected from the following: X+ alkyl benzene sulfonate; X+ alkylnapthalene sulfonate; alkyldiphenyloxide disulfonate; diallyldiphenyloxide disulfonate; X+ alkyl sulfate; naphthalene sulfonate formaldehyde condensate; and combinations thereof. The method of invention further provides foamers that are compatible with a reverse osmosis membrane.