Amido-Functionalized Gemini Surfactant for Subterranean Fluid Control
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Solution Overview
Problem
Current technologies for improving conformance in hydrocarbon production, such as water flooding, face challenges in uniformly sweeping hydrocarbons from subterranean formations due to imperfect fluid flow management, leading to left-over hydrocarbons in hard-to-reach or less permeable zones, increasing production costs and reducing reservoir life.
Innovation Solution
Introduction of an amido-functionalized Gemini surfactant into the subterranean formation, which comprises a head group with two cationic groups linked by an alkyl spacer and amide extensions, allowing for resistance to water flow while maintaining hydrocarbon flow, acting as a relative permeability modifier to enhance hydrocarbon recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water flooding operations are used to drive hydrocarbon production, then pressure is increased to maintain production, but water displaces hydrocarbons and becomes an increasing fraction during production, reducing reservoir life
Solution Approach 1:
The Gemini surfactant creates locally different permeability properties in the formation by adsorbing preferentially in water-producing zones, making those zones less permeable to water while maintaining or enhancing hydrocarbon permeability. This local modification of flow properties allows water control without sacrificing overall production
Solution Approach 2:
The surfactant changes the relative permeability parameters of the formation by adsorbing onto rock surfaces and altering interfacial tensions. This modifies the flow behavior of water and hydrocarbons, reducing water mobility while maintaining hydrocarbon flow capacity, thereby improving the water-to-hydrocarbon ratio in production
2Object-affected harmful factors
If conventional conformance technologies (plugs, packers, polymer gels) are used to block water flow, then water flow is restricted, but these methods may also impede hydrocarbon flow or require complex placement
Solution Approach 1:
The Gemini surfactant performs multiple functions simultaneously: it blocks water flow into productive zones, enhances hydrocarbon recovery, and improves conformance all through a single chemical agent. This eliminates the need for separate mechanical or chemical conformance control measures
Solution Approach 2:
The patent replaces mechanical conformance control methods (plugs, packers) with a chemical approach using Gemini surfactants. The surfactant achieves water blocking through chemical adsorption and interfacial tension modification rather than physical barriers, allowing for more flexible and reversible control
3Reliability
If relative permeability modifiers are used to improve conformance, then water flow is controlled, but additional technologies are required and placement precision is challenging
Solution Approach 1:
The patent combines multiple conformance control functions into a single Gemini surfactant molecule. The surfactant simultaneously provides water blocking, hydrocarbon flow enhancement, and conformance improvement, eliminating the need for multiple separate technologies and simplifying the overall system
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 Gemini surfactant effectively blocks water flow into unwanted zones, improves sweep efficiency, and enhances hydrocarbon flow by adsorbing onto formation rock, reducing interfacial surface tension and wettability, thereby improving hydrocarbon recovery and conformance without significantly affecting water flow.
Implementation Method 1
enhances hydrocarbon flow by adsorbing onto formation rock
Implementation Method 2
reducing interfacial surface tension and wettability
Implementation Method 3
The hydrocarbon tails are oriented in a direction that resists the flow of water
Data Source
AI summary
Controlling fluid flow in a subterranean formation containing water and hydrocarbons utilizing a Gemini surfactant introduced to the formation via a wellbore. The Gemini surfactant includes a head group having two cationic groups linked by an alkyl spacer, an amide extending from each of the cationic groups, and each amide having a hydrophobic tail extending therefrom.