Modified Nano Graphite Polymer Composite for High Temperature Oil Recovery

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Solution Overview

Problem

Existing polymer flooding technologies are not suitable for high temperature and high salinity oil reservoirs due to poor temperature resistance and salt tolerance, leading to reduced recovery efficiency.

Innovation Solution

A modified nano graphite and polymer composite material is developed, with a specific structure and preparation method using in-situ polymerization, which is suitable for high temperature and high salinity conditions, providing improved recovery ratio and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional polymer flooding is used in high temperature and high salinity oil reservoirs, then the polymer can provide viscosity enhancement and flow control, but the polymer degrades due to poor temperature resistance and salt tolerance, leading to reduced recovery efficiency

Engineering Contradiction:

Improvepolymer stabilityVSAvoidreservoir temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent introduces modified nano graphite particles with specific surface treatments and functional group modifications to enhance polymer stability at high temperatures and high salinity conditions, directly addressing the parameter changes in the reservoir environment

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining polymer chains with modified nano graphite particles, where the composite structure provides both the viscosity enhancement of polymers and the thermal/salt stability of the modified nano graphite, resolving the contradiction between polymer functionality and environmental stability

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional polymer flooding is used in high temperature and high salinity oil reservoirs, then the polymer can provide flow control and heterogeneity regulation, but the polymer structure breaks down under severe conditions, resulting in low recovery rate

Engineering Contradiction:

Improverecovery rateVSAvoidhigh salinity and high temperature

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The modified nano graphite particles act as an intermediary between the polymer and the harsh reservoir environment, protecting the polymer structure from degradation while maintaining its flow control and heterogeneity regulation functions, thereby enabling improved recovery rates

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the nano graphite parameters including surface area, functional groups, and particle size to optimize the composite material's resistance to high salinity and high temperature, directly countering the harmful environmental factors

Inventive Principle:

Principle #35Parameter changes

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 polymer composite material maintains high viscosity retention rates and exhibits good temperature resistance and salt tolerance, enhancing oil recovery efficiency in high temperature and high salinity environments.

Implementation Method 1

the polymer composite material for improving the recovery ratio of the high temperature and high salinity oil reservoir is suitable for oil reservoir conditions with the temperature of 130-150° C. and the mineralization degree of 5-30 ten thousand mg/L

Methodology Applied

Scientific EffectTemperature resistance:

Implementation Method 2

Methodology Applied

Scientific EffectSalt tolerance:

Data Source

PatentUS10829378B1Modified nano graphite and polymer composite material thereof, preparation method and use in high temperature and high salinity oil reservoir

Publication Date: 2020.11.10 NORTHWEST OILFIELD BRANCH CHINA PETROLEUM & CHEM CO LTD

AI summary

A modified nano graphite, a polymer composite material of the modified nano graphite, and use of the polymer composite material in a high temperature and high salinity oil reservoir.