Introduction
Viscoelastic Surfactant (VES) diverting acid has become one of the preferred technologies for carbonate stimulation because it creates temporary viscosity without leaving polymer residues. Compared with conventional gelled acids, VES systems offer cleaner fracture conductivity and simpler post-treatment cleanup.
However, field engineers often discover that a successful VES treatment depends on much more than simply selecting a surfactant. Improper formulation design, incompatible additives, and unsuitable operating conditions can significantly reduce treatment effectiveness.
This article discusses five common challenges encountered during VES diverting acid operations and practical approaches to overcoming them.
Problem 1 – Rapid Viscosity Loss at Elevated Temperatures
High reservoir temperatures are one of the biggest challenges for VES systems.
As temperature increases, wormlike micelle structures gradually become less stable, causing viscosity to decline.
Typical symptoms include:
- Reduced diversion efficiency
- Poor fluid suspension capability
- Shortened effective treatment time
Recommended Solution
Instead of simply increasing surfactant dosage, optimize the entire formulation by selecting a VES product specifically designed for higher temperatures.
Our AC-VES Viscoelastic Surfactant Diverting Agent has been developed for demanding acidizing applications and can be customized according to reservoir temperature.
Product information:
https://www.scall-chemical.com/viscoelastic-surfactant-diverting-agent-ac-ves-2-product/
Problem 2 – Corrosion Inhibitor Reduces VES Performance
Many engineers focus on corrosion protection without considering compatibility.
Certain corrosion inhibitors contain solvents or surfactants that interfere with wormlike micelle formation, resulting in:
- Lower viscosity
- Reduced diversion
- Phase instability
- Poor laboratory repeatability
Recommended Solution
Always evaluate the corrosion inhibitor together with the VES formulation rather than individually.
Sichuan All-Chem supplies corrosion inhibitors specifically selected for compatibility with VES acid systems.
Learn more:
https://www.scall-chemical.com/acidizing-corrosion-inhibitor-ac-ci-series-products-product/
Problem 3 – Poor Laboratory Repeatability
One laboratory reports excellent viscosity, while another reports disappointing performance.
Common causes include:
- Different acid concentrations
- Different iron contents
- Water quality variation
- Different mixing sequences
- Different temperatures
Rather than assuming the VES product is responsible, first standardize the testing procedure.
Consistent laboratory methodology is essential before comparing products.
Problem 4 – Unexpected Gel Breaking
VES systems are designed to break naturally after contacting reservoir hydrocarbons.
However, premature gel breaking sometimes occurs because of:
- Organic contaminants
- Incorrect additive sequence
- Incompatible chemicals
- Excessive mutual solvent concentration
Maintaining a balanced formulation helps preserve viscosity during pumping while allowing clean breakback after treatment.
Problem 5 – Optimizing Total Treatment Cost
Many operators attempt to reduce chemical cost by purchasing the lowest-priced VES or corrosion inhibitor individually.
In reality, the total treatment cost is determined by:
- Required dosage
- Compatibility
- Operational reliability
- Equipment protection
- Production improvement
A slightly higher-quality chemical package often reduces the overall stimulation cost by improving treatment efficiency and reducing operational risks.
Why an Integrated Chemical Package Makes the Difference
Rather than selecting each additive separately, many service companies now prefer complete stimulation packages.
A properly integrated system typically includes:
- VES Diverting Agent
- Acidizing Corrosion Inhibitor
- Iron Control Additive
- Mutual Solvent
- Other Acidizing Additives
Because these products are developed together, compatibility issues are significantly reduced.
Sichuan All-Chem’s Solution
Sichuan All-Chem Chemical Co., Ltd. provides customized stimulation chemical packages including:
- AC-VES Viscoelastic Surfactant Diverting Agent
- AC-CI Series Acidizing Corrosion Inhibitors
- Organic Zirconium Crosslinkers
- Eco-friendly Gel Breakers
- Other stimulation additives
Instead of supplying only individual chemicals, our technical team assists customers in optimizing complete acidizing fluid formulations based on reservoir conditions and laboratory evaluation.
Conclusion
Most challenges encountered in VES diverting acid treatments are not caused by the surfactant itself but by formulation compatibility and system design.
Selecting a compatible VES diverting agent together with a properly matched acidizing corrosion inhibitor is one of the most effective ways to improve stimulation performance, reduce corrosion risk, and simplify field implementation.
Whether you are developing a new acid system or optimizing an existing formulation, an integrated chemical solution can significantly improve treatment reliability.
Learn More
AC-VES Viscoelastic Surfactant Diverting Agent
https://www.scall-chemical.com/viscoelastic-surfactant-diverting-agent-ac-ves-2-product/
AC-CI Series Acidizing Corrosion Inhibitors
https://www.scall-chemical.com/acidizing-corrosion-inhibitor-ac-ci-series-products-product/
Post time: Jul-13-2026