Degradable Polyacrylamide Friction Reducer for Delayed Surfactant Release

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Solution Overview

Problem

Traditional friction reducers in hydraulic fracturing fluids do not effectively combine oil displacement functionality with friction reduction, often requiring separate additives and leading to premature absorption into rock surfaces due to lack of delayed release mechanisms.

Innovation Solution

A degradable polyacrylamide friction reducer with surfmers bonded to the polymer, which breaks down under downhole conditions to release surfactants for oil displacement, providing both friction reduction and delayed oil displacement functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate displacement additives are used in hydraulic fracturing fluid, then oil displacement functionality is achieved, but the additives are absorbed into porous rock surfaces prematurely before reaching the fracturing site

Engineering Contradiction:

Improveoil displacement functionalityVSAvoidpremature absorption timing

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines the displacement additive and friction reducer into a single integrated compound molecule. The displacement additive portion provides oil displacement functionality while the friction reducer portion decreases friction during pumping. This merging eliminates the need for separate additives and prevents premature absorption by controlling the release mechanism through the degradable bond structure.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The degradable bond is prepared in advance during compound formation, creating a delayed-release mechanism. The displacement additive remains bound to the friction reducer during pumping (preliminary phase), then releases at the fracturing site when conditions trigger degradation. This preliminary preparation ensures timely delivery and prevents premature absorption into rock surfaces.

Inventive Principle:

Principle #10Preliminary action

2Object-generated harmful factors

If traditional friction reducers are used alone, then friction is reduced during pumping, but oil displacement functionality is not provided

Engineering Contradiction:

Improvefriction during pumpingVSAvoidoil displacement capability

Core Design Contradiction:

Object-generated harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal compound that performs multiple functions: friction reduction during pumping and oil displacement at the fracturing site. The single integrated molecule serves both purposes through its dual-component structure (friction reducer portion + displacement additive portion), eliminating the need for separate additives and simplifying the fracturing fluid formulation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If multiple separate additives are used for friction reduction and oil displacement, then both functions are achieved, but the formulation complexity and blending operation complexity increase

Engineering Contradiction:

Improvefriction reduction and oil displacement performanceVSAvoidblending operation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

By merging multiple separate additives into a single integrated compound, the patent simplifies the blending operation. Instead of separately dosing and balancing multiple additives, the unified compound is added as one component, reducing formulation complexity while maintaining both friction reduction and oil displacement performance.

Inventive Principle:

Principle #5Merging (Combining)

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 degradable friction reducer effectively reduces friction during pumping and enhances oil recovery by delaying the release of surfactants until they reach the fracturing site, minimizing premature absorption and improving hydrocarbon recovery efficiency.

Implementation Method 1

a bond between the polyacrylamide polymer and the one or more surfmers can be degradable under downhole conditions

Methodology Applied

Scientific EffectDegradation: Decomposition (biological)

Implementation Method 2

Friction reducers are added to the hydraulic fracturing fluid to decrease friction and therefore reduce wear on equipment and piping. Friction reducers change the rheological properties of the hydraulic fracturing fluid to reduce friction

Methodology Applied

Scientific EffectFriction reduction: Friction

Implementation Method 3

the one or more surfmers can displace hydrocarbons that are exposed by the fracturing within the wellbore

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Data Source

PatentUS20240409805A1Degradable friction reducer for hydraulic fracturing treatments

Publication Date: 2024.12.12 CNPC USA CORP

AI summary

A polyacrylamide friction reducer wherein the friction reducer contains surfactant functional groups, and wherein the polyacrylamide friction reducer is degradable, can be used for multi-functional, slickwater fracturing fluid projects. Under downhole conditions, the polymer degrades and releases the surfactant molecules to act as oil displacing agent to provide additional stimulation.