Surfactant-Polyelectrolyte Complexes for Deep Reservoir Penetration
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Solution Overview
Problem
Surfactants used in subterranean treatments often undergo adsorption onto rock surfaces and proppant particulates, limiting their availability and effectiveness in reaching deep reservoirs.
Innovation Solution
Formation of surfactant-polyelectrolyte complexes (SPCs) through mixing oppositely charged surfactants and polyelectrolytes in a stop-flow mixing apparatus, which are then introduced into subterranean formations to minimize adsorption and enhance penetration depth, with mechanisms like salinity changes or temperature gradients releasing surfactant molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If surfactants are used in treatment fluids for subterranean operations, then productivity is improved, but surfactant availability decreases due to adsorption onto rock surfaces and proppant particulates
Solution Approach 1:
The patent introduces polyelectrolytes as intermediary substances that bind to surfactants through electrostatic attraction, forming complexes that prevent direct adsorption of surfactants onto rock surfaces and proppant particles. This intermediary mechanism maintains surfactant availability while preserving productivity benefits.
Solution Approach 2:
The patent modifies the chemical parameters of the treatment fluid by adding polyelectrolytes that change the electrostatic properties of the surfactant-solution system. This parameter change prevents surfactant adsorption while maintaining the surfactant's effectiveness in improving productivity.
2Quantity of substance
If strong adsorption occurs near the wellbore, then surfactant is retained locally, but penetration depth into the reservoir decreases
Solution Approach 1:
Polyelectrolytes act as intermediaries that bind surfactants in solution, preventing their adsorption onto rock surfaces and proppant particles. This ensures surfactants remain in the fluid phase and can penetrate deeper into the reservoir rather than being retained near the wellbore.
Solution Approach 2:
The patent applies preliminary anti-action by introducing polyelectrolytes before the surfactants can adsorb onto rock surfaces. The polyelectrolytes preemptively bind to the surfactants, creating complexes that resist adsorption and enable deeper penetration into the reservoir.
3Quantity of substance
If surfactant is adsorbed onto rock surfaces, then local concentration increases, but overall surfactant effectiveness decreases
Solution Approach 1:
The polyelectrolyte-surfactant complex acts as an intermediary that prevents direct interaction between surfactants and rock surfaces. This maintains surfactant effectiveness by preventing adsorption, while the complex itself provides the necessary local concentration for effective treatment.
Solution Approach 2:
The patent changes the electrostatic parameters of the system by introducing polyelectrolytes, which modifies the interaction between surfactants and rock surfaces. This parameter change prevents adsorption while maintaining sufficient local concentration for effective treatment, thereby preserving surfactant effectiveness.
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
Increases the penetration depth of treatment fluids, allowing for effective treatment of deep pores and enhancing oil recovery by maintaining surfactant stability and altering fluid viscoelastic properties to improve flow contact and diversion.
Implementation Method 1
a surfactant and a polyelectrolyte carrying opposite electrostatic charges are added to a stop-flow mixing apparatus and mixed at an appropriate speed to form one or more SPCs
Implementation Method 2
with mechanisms like salinity changes or temperature gradients releasing surfactant molecules
Implementation Method 3
with mechanisms like salinity changes or temperature gradients releasing surfactant molecules
Implementation Method 4
altering fluid viscoelastic properties to improve flow contact and diversion
Data Source
AI summary
Systems and methods for creating surfactant-polyelectrolyte complexes at a well site are provided. In one embodiment, the methods comprise: providing a first solution comprising at least one surfactant and a second solution comprising at least one polyelectrolyte; using a stop-flow mixing apparatus at a well site to mix the first and second solutions to form one or more surfactant-polyelectrolyte complexes; using a low-dose pumping apparatus at the well site to transfer the one or more surfactant-polyelectrolyte complexes from the stop-flow mixing apparatus to a blending apparatus at the well site; using the blending apparatus to mix the one or more surfactant-polyelectrolyte complexes with an aqueous base fluid to form a treatment fluid; and introducing the treatment fluid into a well bore penetrating at least a portion of a subterranean formation at the well site.