Direct Ink Printed Wellbore Cement for Durable Zonal Isolation

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Solution Overview

Problem

The petroleum industry faces significant challenges in achieving durable zonal isolation and preventing fluid flow between zones in wellbores, leading to costly repairs and failures in cement sheaths, which affect the longevity and efficiency of oil and gas wells.

Innovation Solution

The use of cement-based composite structures formed through direct ink writing, incorporating a cement matrix, polymer-based additives like polyrotaxanes, and rheology modifying agents, to create 3D printed layers with uniform stress distribution, enhancing mechanical strength and toughness for improved sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional cement placement methods are used, then the cementing process is simple and cost-effective, but the cement sheath fails to provide durable zonal isolation and requires costly repairs

Engineering Contradiction:

Improvedurability of cement sheathVSAvoidcomplexity of cementing process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the physical and chemical parameters of cement by incorporating polymer-based additives (polyrotaxanes) and rheology modifying agents (nanoclay) to transform traditional cement into a composite material with superior mechanical properties, toughness, and stress distribution characteristics that prevent cracking and provide durable zonal isolation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite cement material by combining cement matrix with polymer-based additives (polyrotaxanes) and rheology modifying agents (nanoclay), forming a multi-component composite that leverages the strengths of each material to achieve enhanced reliability and crack resistance

Inventive Principle:

Principle #40Composite materials

2Reliability

If cement squeezing and operational procedure variations are used to repair cement sheath, then some improvements in sealing can be achieved, but annual repair costs exceed $450 million

Engineering Contradiction:

Improvesealing quality of cement sheathVSAvoidannual repair cost

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by incorporating polymer-based additives and rheology modifying agents into the cement mix before placement, pre-configuring the cement with enhanced properties that prevent future failures and eliminate the need for costly repair operations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the traditionally harmful cracking behavior of cement into a benefit by using polymer additives that modify the cement's mechanical properties, transforming the cement from a material prone to catastrophic failure into one that distributes stress uniformly and prevents crack propagation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Strength

If uniform stress distribution is achieved through direct ink writing, then mechanical strength and toughness are increased, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvemechanical strength of cement compositeVSAvoidease of cement production

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent changes the rheological and mechanical parameters of cement through the addition of polymer-based additives and nanoclay, enabling the cement to achieve uniform stress distribution and enhanced mechanical strength while maintaining manufacturability through controlled mixing and placement procedures

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 method reduces annual costs by preventing primary cementing job failures, ensuring a pressure-tight seal and increased durability of the cement sheath, thereby extending the life and efficiency of oil and gas wells.

Implementation Method 1

The direct ink writing is a type of printing process that uses ink to create complex composite structures that include uniform distribution of forces exerted during the production of the cement matrix

Methodology Applied

Scientific EffectStress distribution:

Implementation Method 2

The methods include forming a slurry that includes cement-based matrix (e.g., Portland cement), water, polymer-based additive (e.g., polyrotaxanes), and a rheology modifying agent (e.g., nanoclay)

Methodology Applied

Scientific EffectRheology modification:

Implementation Method 3

The printed cement-based composite is produced with uniform distribution of forces, increased mechanical strength, and toughness that allows for pressure tight seal between the casing and the formation

Methodology Applied

Scientific EffectSealing:

Data Source

PatentUS12540269B2Cementing a wellbore using a direct ink printing

Publication Date: 2026.02.03 SAUDI ARABIAN OIL CO

AI summary

Methods and systems for cementing a wellbore are described. The methods include forming a slurry including a cement-based matrix, water, a polymer-based additive, and a rheology modifying agent; mixing the slurry to form a printing ink; introducing the slurry and a printer into a wellbore; and forming a cement-based composite structure in the wellbore by printing a plurality of layers using the printing ink.