Cationic Coagulant Compositions for SAGD Produced Water Pretreatment

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Solution Overview

Problem

Hot/warm lime softening processes in SAGD facilities are costly and inefficient in removing organic and inorganic contaminants from produced water, leading to equipment fouling and scaling issues.

Innovation Solution

A coagulant composition comprising cationic coagulant polymers, such as starch-based and tannin-based compounds, is added to produced water prior to lime softening, forming precipitated solids for improved removal of organics and inorganics without increasing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hot/warm lime softening processes are used to remove organic and inorganic contaminants, then water hardness is reduced, but the process becomes costly and inefficient with equipment fouling and scaling issues

Engineering Contradiction:

Improvecontaminant removal effectivenessVSAvoidprocess complexity and cost

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The coagulant is added to produced water before lime softening to pre-precipitate organic and inorganic contaminants. This preliminary action removes contaminants that would otherwise interfere with the lime softening process, improving its effectiveness while reducing the need for complex post-treatment steps and chemical dosing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A coagulant acts as an intermediary substance between the produced water and the lime softening process. The coagulant (comprising cationic polymers, starch, tannin, or chitosan) mediates the removal of contaminants by forming precipitated solids that can be easily separated, thereby simplifying the overall treatment process

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If standard hot/warm lime softening treatments are applied, then water hardness is reduced, but organic and inorganic matter removal remains challenging

Engineering Contradiction:

Improvehardness removalVSAvoidcontaminant removal efficiency

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The coagulant is introduced before lime softening to pre-precipitate organic and inorganic contaminants. This preliminary action ensures that contaminants are removed in advance, allowing the lime softening process to focus on hardness removal with improved overall effectiveness

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The coagulant comprises multiple components (cationic polymers, starch, tannin, or chitosan) that work synergistically to remove both organic and inorganic matter. This composite approach enhances contaminant removal efficiency while maintaining simplicity in the treatment process

Inventive Principle:

Principle #40Composite materials

3Reliability

If coagulant chemistry is increased to improve contaminant removal, then organic and inorganic matter is better removed, but operational costs increase

Engineering Contradiction:

Improvecontaminant removal effectivenessVSAvoidcoagulant dosage and cost

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The coagulant is added before lime softening to pre-precipitate contaminants, reducing the amount of coagulant chemistry needed during subsequent treatment steps. This preliminary action lowers overall operational costs while maintaining effective contaminant removal

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The coagulant acts as an intermediary that enhances contaminant removal efficiency, allowing for reduced dosages of subsequent chemicals. By mediating the removal process early, it reduces the total quantity of substances required, thereby lowering operational costs

Inventive Principle:

Principle #24Intermediary (Mediator)

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 turbidity and improves effluent water quality by effectively removing contaminants, achieving turbidity levels below 50 NTU with reduced chemical dosages compared to conventional methods.

Implementation Method 1

combining a coagulant composition with a produced water in a Steam Assisted Gravity Drainage prior to lime softening, forming precipitated solids within the produced water

Methodology Applied

Scientific EffectCoagulation: Coagulation

Implementation Method 2

a coagulant composition comprising a coagulant polymer, at least one additional coagulant, and a solvent

Methodology Applied

Scientific EffectFlocculation: Flocculation

Implementation Method 3

forming precipitated solids within the produced water

Methodology Applied

Scientific EffectSedimentation: Sedimentation

Data Source

PatentUS20250276922A1Cationic coagulant and flocculant compositions and methods of use to remove organics/inorganics from produced water at high temperature operations

Publication Date: 2025.09.04 CHAMPIONX LLC

AI summary

Compositions and methods for mitigating organic and inorganic contaminants in produced water prior to lime softening in a steam-assisted gravity drainage facilities (SAGD) are disclosed. In particular methods wherein starch-based coagulants and/or flocculants are added to produced water prior to warm lime softening in a SAGD facility are disclosed.