Geopolymer Well Cement Composition for Self-Healing Zonal Isolation

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Solution Overview

Problem

Geopolymer compositions used in subterranean wells face challenges such as debonding, cracking, and loss of integrity due to temperature fluctuations, mechanical stresses, and hydraulic fracturing, which compromise zonal isolation and bonding with tubular bodies and formation surfaces.

Innovation Solution

Forming a geopolymer precursor using an aluminosilicate source, metal silicate, alkali activator, and carrier fluid, with additives like expanding agents, self-healing agents, flexibility agents, and tensile strength improvement agents to enhance mechanical strength, flexibility, and self-healing properties, which are then hardened in the well to form a geopolymer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional hydratable cements are used in well cementing, then the cementing process is simple and well-established, but the cement lacks sufficient mechanical strength and flexibility to withstand temperature fluctuations and mechanical stresses

Engineering Contradiction:

Improvemechanical strengthVSAvoidcement composition complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent uses composite materials by combining geopolymer precursors with various additives including expanding agents, flexibility agents, self-healing agents, and tensile strength improvement agents. This composite approach allows the cement to achieve enhanced mechanical strength and flexibility while maintaining workability, directly resolving the contradiction between strength improvement and composition complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies parameter changes by modifying the chemical composition parameters of the geopolymer precursor, including the Si/Al ratio, water content, and additive concentrations. These parameter adjustments optimize the balance between mechanical strength, flexibility, and setting characteristics, enabling the cement to withstand downhole conditions without excessive complexity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If geopolymer compositions are used to improve mechanical strength and flexibility, then the cement maintains integrity under stress, but the setting time and placement operation become more complex

Engineering Contradiction:

Improveintegrity under stressVSAvoidplacement operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies preliminary action by pre-mixing the geopolymer precursor with all necessary additives (expanding agents, flexibility agents, self-healing agents, tensile strength improvement agents) before placement in the well. This preliminary preparation ensures the composition is ready for immediate use, maintains optimal setting characteristics, and simplifies the placement operation while guaranteeing integrity under stress.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent incorporates self-healing agents that enable the geopolymer to automatically repair micro-cracks and maintain integrity under stress without external intervention. This self-service mechanism enhances reliability while requiring no additional operational complexity during well operations.

Inventive Principle:

Principle #25Self-service

3Strength

If expanding agents are added to improve bonding with formation surfaces, then the cement sheath expands to enhance contact, but the volume and weight of the cement slurry increase

Engineering Contradiction:

Improvebonding strengthVSAvoidcement slurry weight

Core Design Contradiction:

StrengthVSWeight of stationary object

Solution Approach 1:

The patent applies parameter changes by carefully controlling the concentration and type of expanding agents in the geopolymer precursor. By optimizing these parameters, the cement achieves sufficient expansion for enhanced bonding while minimizing excessive volume and weight increases, balancing bonding strength improvement with slurry handling characteristics.

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 geopolymer systems demonstrate improved mechanical strength, flexibility, and self-healing capabilities, maintaining integrity and bonding under stress conditions, thereby ensuring effective zonal isolation and well integrity.

Implementation Method 1

Geopolymers are a class of materials that are formed by chemical dissolution and subsequent recondensation of various aluminosilicate oxides and silicates to form an amorphous three-dimensional framework structure

Methodology Applied

Scientific EffectChemical dissolution and recondensation:

Implementation Method 2

a dispersed expanding agent

Methodology Applied

Scientific EffectExpansion:

Implementation Method 3

forming a geopolymer precursor comprising an aluminosilicate source, a metal silicate, an alkali activator

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Data Source

PatentUS20260035606A1Geopolymer compositions and methods

Publication Date: 2026.02.05 SCHLUMBERGER TECH CORP

AI summary

Geopolymer precursors are presented that are useful for subterranean wells. The precursors contain an aluminosilicate source, an alkali activator, and a carrier fluid. Additives are incorporated into the precursors to induce expansion, self-healing, flexibility, and to improve tensile and shear-bond strength.