Phosphonate Acid Blend for Wellbore Scale in High-CO2 Brines

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Solution Overview

Problem

Scale formation in wellbores with high alkalinity and high CO2 content poses challenges, impacting wellbore operations by damaging equipment and reducing productivity, and existing scale inhibitors are ineffective in such environments.

Innovation Solution

A blend of phosphonate acids, including aminoethylethanolamine tri(methylene phosphonate) and polyamino polyether methylene phosphonate, is used to prevent scale formation, providing synergistic effects and improved compatibility with brines, even in high CO2 and high temperature conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional scale inhibitors are used in high alkalinity and high CO2 environments, then scale prevention is attempted, but the inhibitors become ineffective and scale formation occurs

Engineering Contradiction:

Improvescale inhibition effectivenessVSAvoidcompatibility with high alkalinity and high CO2 environments

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the chemical parameters of the scale inhibitor by using a blend of phosphonate acids with specific molecular structures and properties. The blend includes phosphonates with varying chain lengths, functional groups, and molecular weights, allowing the formulation to maintain effectiveness across a broader range of environmental conditions including high alkalinity and high CO2 environments.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite approach by creating a blend of multiple phosphonate acids rather than using a single compound. The blend combines phosphonates with different chemical characteristics (e.g., amino phosphonates, hydroxy phosphonates, carboxy phosphonates) to achieve synergistic effects that improve both scale inhibition effectiveness and environmental adaptability.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If scale prevention treatment is applied in challenging wellbore environments, then scale formation is addressed, but the treatment effectiveness is reduced due to high temperature and high CO2 content

Engineering Contradiction:

Improvescale formation damageVSAvoidtreatment effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent modifies the chemical parameters of the inhibitor formulation by selecting phosphonate acids with high thermal stability and resistance to degradation in high CO2 environments. The blend includes phosphonates with stable molecular structures that maintain their scale-inhibiting properties at elevated temperatures and in high CO2 conditions where conventional inhibitors fail.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a blend of phosphonate acids is used to improve scale inhibition, then effectiveness in challenging environments is improved, but formulation complexity increases

Engineering Contradiction:

Improvescale inhibition effectivenessVSAvoidformulation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent achieves universality by designing a phosphonate blend that performs multiple functions simultaneously: it prevents scale formation, maintains stability in high alkalinity environments, resists degradation in high CO2 conditions, and withstands elevated temperatures. This multi-functional formulation reduces the need for multiple separate treatments.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines multiple phosphonate acids into a single integrated formulation that works synergistically. By merging compounds with complementary properties into one blend, the patent simplifies the treatment application process while maintaining the complex chemical functionality needed to address multiple environmental challenges simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

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 phosphonate acid blend effectively inhibits scale formation, including calcite scale, while maintaining low corrosivity and stability, and enhances brine compatibility, thus ensuring stable and productive wellbore operations.

Implementation Method 1

The blend of phosphonate acids provides the treatment fluid the ability to prevent scale formation and deposition

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

Scale formation is the process of mineral deposition on wellbore surfaces and equipment

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Data Source

PatentUS20260028524A1Blend of phosphonate acids for scale prevention in high alkalinity and high co2 environments

Publication Date: 2026.01.29 HALLIBURTON ENERGY SERVICES INC

AI summary

Treatment fluids and methods for preventing the formation of scale. A treatment fluid is provided to the wellbore. The treatment fluid is composed of polyamino polyether methylene phosphonate (PAPEMP), aminoethylethanolamine tri(methylene phosphonate) (AEEA), an organic acid, and an aqueous base fluid. The treatment fluid is introduced into a wellbore penetrating a subterranean formation. A mineral in the wellbore is contacted with the treatment fluid thereby preventing further mineral formation and deposition.