Epoxy Polyrotaxane Composites for Well Cement Sheath Integrity

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Solution Overview

Problem

Existing cement compositions used in oil and gas well cementing fail to provide durable zonal isolation due to mechanical and thermal property limitations, leading to cement sheath failures.

Innovation Solution

A shape memory composition comprising a thermally-curable epoxy resin and a sliding-ring polymer additive, specifically cross-linked polyrotaxane beads, which allows for reversible shape changes in response to temperature and mechanical stimuli.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional cement compositions are used, then zonal isolation is achieved, but mechanical and thermal properties are insufficient leading to cement sheath failures

Engineering Contradiction:

Improvedurability of zonal isolationVSAvoidmechanical and thermal properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent incorporates sliding-ring polymer compositions (polyrotaxanes) into epoxy resin matrices to create composite materials that combine the adhesive properties of epoxy with the shape memory and mechanical enhancement properties of polyrotaxanes, resolving the contradiction between reliability and strength

Inventive Principle:

Principle #40Composite materials

2Strength

If cement compositions with improved mechanical properties are developed, then resistance to mechanical stresses is enhanced, but adaptability to temperature fluctuations is reduced

Engineering Contradiction:

Improveresistance to mechanical stressesVSAvoidresponse to temperature fluctuations

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The sliding-ring polymer composition introduces dynamic molecular structures that can slide and reconfigure in response to temperature changes, allowing the material to adapt its mechanical properties dynamically rather than remaining static, thus resolving the contradiction between strength and temperature adaptability

Inventive Principle:

Principle #15Dynamics

3Strength

If elastic materials are blended into cement, then some mechanical flexibility is improved, but the fundamental failure issues of cement sheaths are not resolved

Engineering Contradiction:

Improvemechanical flexibilityVSAvoidcement sheath failure resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent fundamentally changes the material parameters by introducing shape memory polymers with transition temperatures that allow the cement composite to undergo reversible structural changes, transforming from a static brittle material to a dynamic material that can absorb and recover from mechanical failures, thereby resolving the contradiction between flexibility and reliability

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 shape memory composition enhances the mechanical and thermal properties of cement compositions, enabling improved zonal isolation and resistance to temperature fluctuations and mechanical stresses.

Implementation Method 1

shape memory behavior of epoxy/sliding-ring polymer composites

Methodology Applied

Scientific EffectShape memory behavior: Shape Memory Polymer

Data Source

PatentUS20250197629A1Shape memory behavior of epoxy/sliding-ring polymer composites

Publication Date: 2025.06.19 SAUDI ARABIAN OIL CO

AI summary

This document relates to shape memory compositions containing a sliding-ring polymer (polyrotaxane) additive and a thermally-curable epoxy resin. The shape memory compositions are able to deform and reform in response to external stimuli. This document also relates to 3D-printed shape memory compositions containing a sliding-ring polymer (polyrotaxane) additive and a thermally-curable epoxy resin.