Magnetically Responsive Drilling Fluids for Thermal Thinning

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Solution Overview

Problem

Conventional drilling fluids face challenges with thermal thinning, leading to decreased ability to suspend proppant and perform zonal isolation as temperature increases, resulting in issues like barite sag and reduced hole-cleaning ability.

Innovation Solution

Development of magnetically responsive drilling fluids containing superparamagnetic nanostructures, such as superparamagnetic-iron-oxide-nanoparticles (SPIONs) and carbon nanotubes, which exhibit dynamically tunable rheological properties when a magnetic field is applied, enhancing viscosity and gel strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional drilling fluids are used, then the drilling fluid can perform basic drilling functions, but the viscosity and gel strength decrease as temperature increases due to thermal thinning

Engineering Contradiction:

ImprovetemperatureVSAvoidviscosity and gel strength

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent applies magnetic field parameter changes to dynamically adjust the rheological properties of drilling fluid. When a magnetic field is applied, the superparamagnetic particles align and form structures that increase viscosity and gel strength. This allows the fluid to maintain high viscosity at elevated temperatures when needed, and return to low viscosity when the magnetic field is removed, resolving the thermal thinning problem.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent incorporates superparamagnetic particles (such as magnetite or maghemite nanoparticles) into the drilling fluid matrix, creating a composite material with magnetically responsive rheological properties. This composite structure enables the fluid to exhibit temperature-resistant viscosity characteristics through magnetic particle interactions, overcoming the limitations of conventional single-phase drilling fluids.

Inventive Principle:

Principle #40Composite materials

2Temperature

If the temperature of drilling fluid increases, then drilling depth can be increased, but the ability to suspend proppant and perform zonal isolation decreases

Engineering Contradiction:

ImprovetemperatureVSAvoidproppant suspension and zonal isolation

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent uses magnetic field parameter changes to dynamically control the suspension capability of proppant at high temperatures. The applied magnetic field causes superparamagnetic particles to form chain structures and aggregates that increase apparent viscosity and gel strength, providing enhanced proppant suspension and zonal isolation forces even at elevated temperatures where conventional fluids would thin.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If magnetically responsive drilling fluid is used, then viscosity and gel strength can be increased in response to magnetic field, but the device complexity increases

Engineering Contradiction:

Improveviscosity and gel strengthVSAvoidmagnetic field application system

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical viscosity control systems with a magnetic field-based control mechanism. Instead of using mechanical agitators, variable speed pumps, or complex rheology modifiers, the system uses magnetic fields to control viscosity and gel strength, simplifying the overall system architecture while providing precise rheological control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 magnetically responsive drilling fluids demonstrate increased viscosity and gel strength in response to a magnetic field, improving zonal isolation and hole-cleaning capabilities, even at elevated temperatures, thereby addressing the limitations of conventional drilling fluids.

Implementation Method 1

The superparamagnetic nanostructures include superparamagnetic-iron-oxide-nanoparticles (SPIONs) and carbon nanotubes adsorbed onto the SPIONs

Methodology Applied

Scientific EffectSuperparamagnetism: Superparamagnetism

Implementation Method 2

applying a magnetic field to the magnetically responsive drilling fluid to elicit a rheological change in the magnetically responsive drilling fluid

Methodology Applied

Scientific EffectMagnetorheological effect: Magnetorheological Fluid

Data Source

PatentUS11370952B2Magnetically responsive drilling fluid and methods of making and use thereof

Publication Date: 2022.06.28 SAUDI ARABIAN OIL CO

AI summary

Magnetically responsive drilling fluids and methods of using magnetically responsive drilling fluids. The magnetically responsive drilling fluids may include a drilling fluid and a plurality of superparamagnetic nanostructures disposed within the drilling fluid. The plurality of superparamagnetic nanostructures may include superparamagnetic-iron-oxide-nanoparticles (SPIONs) and carbon nanotubes (CNTs) adsorbed onto the SPIONs. The method of using the magnetically responsive drilling fluid may include introducing the magnetically responsive drilling fluid into a subsurface formation and applying a magnetic field to the magnetically responsive drilling fluid to elicit a rheological change in the magnetically responsive drilling fluid.