By Erna Kakadjian, Technology Manager, Oil & Gas
Introduction
The oil and gas industry has long relied on surfactants to improve fluid performance, reduce interfacial tension, alter wettability, and enhance hydrocarbon recovery. These chemistries play critical roles in reservoir stimulation, production enhancement, scale remediation, and flow assurance. However, increasing environmental scrutiny, evolving regulations, and corporate sustainability initiatives are driving interest in surfactants derived from renewable resources that can deliver both environmental and operational benefits.
Among the most promising emerging technologies are biosurfactants. Produced through biological processes rather than conventional petrochemical synthesis, biosurfactants represent a fundamentally different class of surface-active materials. Their unique molecular architectures often provide multifunctional performance that extends beyond simple interfacial tension reduction. Recent advances in industrial biotechnology have improved the commercial availability of biosurfactants and expanded their applicability to demanding oilfield environments. As a result, biosurfactants are increasingly being evaluated for enhanced oil recovery (EOR), production chemistry, organic deposit remediation, and scale removal applications [1-8].
Unlike many conventional surfactants designed to perform a specific task, biosurfactants often influence multiple mechanisms simultaneously. They can alter wettability, reduce interfacial tension, disperse deposits, improve fluid transport, and facilitate access to reactive surfaces. This multifunctional behavior is creating new opportunities for formulators seeking more efficient and sustainable solutions to persistent oilfield challenges.
A Different Surfactant Platform
Biosurfactants encompass a diverse family of molecules produced through microbial fermentation. These include glycolipids, lipopeptides, and other naturally derived amphiphilic compounds that combine hydrophilic and hydrophobic domains in ways that differ from traditional synthetic surfactants [6-8].
Many biosurfactants have multiple functional groups that can interact with mineral surfaces, hydrocarbons, and aqueous phases simultaneously. This complexity often enables behaviors that are difficult to achieve with conventional surfactants designed around simpler head-group and tail-group architectures. In addition, biosurfactants are typically produced from renewable feedstocks, providing an alternative manufacturing pathway that aligns with increasing industry interest in sustainable chemistry.
Perhaps more importantly for formulators, biosurfactants frequently maintain activity under conditions that challenge conventional surfactant systems, including elevated salinity, variable pH, and progressive dilution. Such environments are routinely encountered during reservoir stimulation and production operations, making robustness a critical performance characteristic rather than a secondary benefit.
Enhanced Oil Recovery Through Multiple Mechanisms
One of the most actively investigated applications of biosurfactants is enhanced oil recovery. Residual oil often remains trapped within reservoir pore networks after primary and secondary recovery processes due to capillary forces and unfavorable rock-fluid interactions. Effective EOR chemistries must therefore address more than a single interfacial phenomenon.
Laboratory studies have shown that biosurfactants can simultaneously reduce interfacial tension and shift wettability toward more water-wet conditions, improving fluid penetration and hydrocarbon mobilization [2,3]. The combination of these mechanisms is particularly important in unconventional reservoirs, where nano- and micro-scale pore structures create significant capillary trapping forces.
Field results provide encouraging evidence that these laboratory observations translate into meaningful production outcomes. A multi-year stimulation program involving more than seventy wells in the Appalachian Basin reported sustained production increases following biosurfactant-based treatments while also reducing paraffin-related operational issues [2]. Similar observations have been reported in Bakken huff-and-puff projects, where biosurfactant treatments generated production responses that exceeded forecast performance in multiple wells [3].
These results highlight an important characteristic of biosurfactants: their value often derives from the combined effect of several mechanisms operating simultaneously rather than from a single measurable property. While interfacial tension reduction is important, wettability alteration, fluid distribution, hydrocarbon mobilization, and reservoir interaction may all contribute to overall performance.
Performance Under Dilution
One of the greatest challenges for any reservoir treatment chemistry is maintaining effectiveness after placement. Once injected into the formation, surfactants encounter large volumes of reservoir fluids and are continuously diluted over time. Consequently, retaining functionality at declining concentrations can be as important as peak laboratory performance.
Recent laboratory investigations comparing biosurfactants with conventional surfactant systems demonstrated significant differences in concentration resiliency [1]. As treatment concentrations decreased, biosurfactant formulations maintained a substantial portion of their interfacial and wettability-altering capabilities, whereas conventional formulations experienced markedly greater performance losses.
In studies conducted using Williston Basin crude oil systems, biosurfactant formulations maintained strong interfacial tension reduction and wettability modification across a broad dosage range [1]. This behavior is particularly relevant for field applications, where treatment efficiency depends not only on initial performance but also on its persistence as fluids migrate through the formation.
For formulators, this raises an important point. Traditional surfactant evaluation often emphasizes maximum response at a fixed concentration. Biosurfactant systems suggest that maintaining functionality across a wider concentration range may be equally important in understanding long-term field performance.
Addressing Flow Assurance Challenges
Organic deposits remain one of the most persistent challenges in oilfield operations. Paraffin, asphaltenes, and mixed hydrocarbon deposits restrict flow paths, increase intervention frequency, and contribute to production decline across both conventional and unconventional assets.
Historically, remediation strategies have relied heavily on hydrocarbon solvents and thermal treatments. While these approaches can be effective, interest is growing in alternative technologies that provide cleaning, dispersion, and prevention benefits simultaneously.
Recent work has shown that biosurfactants can be combined with biodegradable biosolvents to create multifunctional remediation systems that penetrate, disperse, and stabilize organic deposits [4]. Rather than simply dissolving deposits, these formulations can help suspend and transport fragmented material, reducing the likelihood of redeposition further downstream.
Laboratory evaluations using deposits from producing fields showed high paraffin-dispersion efficiencies, along with significant reductions in particle size and improved wettability of deposit-covered surfaces [4]. These results suggest that biosurfactants can contribute not only to deposit removal but also to longer-term flow assurance through continued dispersion and stabilization mechanisms.
The ability to integrate solvent action, interfacial modification, and particulate stabilization within a single formulation highlights the multifunctional nature of biosurfactant-based systems.
Enhancing Iron Sulfide Removal
Inorganic deposition represents another major challenge within oilfield operations. Iron sulfide is particularly problematic because it can impair production, reduce injectivity, contribute to corrosion, and interfere with downstream operations.
Although mineral acids remain the primary tool for iron sulfide removal, treatment effectiveness can be limited when deposits are coated with hydrocarbons or when reaction products become difficult to disperse and transport.
Research evaluating biosurfactant-enhanced acid systems has demonstrated substantial improvements in iron sulfide dissolution compared with acid treatment alone [5]. Laboratory studies using field-derived deposits showed that biosurfactant-assisted formulations achieved significantly greater removal efficiencies than conventional approaches under the same testing conditions [5].
The improvement is believed to result from several complementary mechanisms. Biosurfactants enhance wetting of hydrocarbon-coated deposits, facilitate access of reactive fluids to mineral surfaces, and help stabilize reaction products as dissolution proceeds. In effect, the biosurfactant becomes an active participant in the treatment chemistry rather than simply functioning as an auxiliary additive.
These findings illustrate how biosurfactants can address challenges that involve both interfacial and chemical processes, expanding their utility beyond traditional surfactant roles.
Sustainability and Environmental Considerations
Attention is increasing on the overall environmental profile of oilfield chemicals. As operators seek to balance performance objectives with sustainability goals, renewable and biodegradable technologies are receiving greater consideration.
Because biosurfactants are produced through fermentation using renewable feedstocks, they offer a manufacturing pathway distinct from conventional petroleum-derived surfactants [6-8]. In many cases, they also exhibit favorable biodegradability and can support reduced treatment loading through improved performance and concentration resilience.
While environmental performance alone is rarely sufficient to justify adoption, biosurfactants are noteworthy because their sustainability attributes are accompanied by demonstrated technical performance across multiple oilfield applications. The combination of environmental and operational benefits represents an increasingly attractive proposition for formulators seeking next-generation solutions.
Looking Ahead
The future of oilfield surfactants will likely be defined less by optimization of a single property and more by the ability to address multiple challenges simultaneously. Biosurfactants exemplify this transition. Their complex molecular architectures allow them to influence wettability, interfacial tension, deposit remediation, fluid transport, and dispersion behavior within a single formulation platform.
As the industry pursues more efficient and sustainable technologies, biosurfactants are moving beyond niche applications and establishing a role in mainstream oilfield chemistry. Continued laboratory development, coupled with growing field validation, suggests that these materials will become increasingly important tools for formulators working in stimulation, production, flow assurance, and remediation.
For specialty chemical companies, the opportunity extends beyond replacing conventional surfactants with biological alternatives. Biosurfactants introduce new molecular architectures that can solve longstanding operational problems while supporting evolving environmental objectives. Their greatest potential may lie not in substituting for existing technologies, but in enabling entirely new approaches to oilfield chemical design.
References
- Pearl, M.R., Kakadjian, E., Hancock, J., et al. Unique Resiliency of Biosurfactants in the Lab and Field with Depleting Concentration. URTeC 4054941, 2024.
- M. Shumway, et al. Green Well Stimulation Fluids for Enhanced Oil Recovery from Tight Sand Formations: Field-Wide 70+ Wells Study Over 4 Years. SPE-204370-MS, 2021.
- Pearl, M.R., Kakadjian, E., et al. Rethinking Surfactant Huff-n-Puff for Enhanced Oil Recovery in the Bakken: Recent Pilot Field Study Utilizing Multifunctional Biosurfactants. SPE-220801-MS, 2024.
- Kakadjian, E., et al. Biosurfactant Nano-Micelles and Bio-Solvents: A Water-Based Approach to Remediate Organic Deposits. SPE-224306-MS.
- Kakadjian, E., Pradhan, S., Gutierrez, E., and Pearl, M.R. Advanced Iron Sulfide Removal with Innovative Biosurfactant Solutions. SPE-227974-MS, 2025.
- Van Bogaert, I.N.A., Saerens, K., De Muynck, C., et al. “Microbial Production and Application of Sophorolipids.” Applied Microbiology and Biotechnology, 2007.
- Shah, V., Jurjevic, M., and Badia, D. “Sophorolipids as Multifunctional Biosurfactants.” Biotechnology Advances.
- Marchant, R., and Banat, I.M. “Biosurfactants: A Sustainable Replacement for Synthetic Surfactants?” Biotechnology Letters.
- Pradhan, S., et al. A Water-Based Microemulsion Technology for Effective Paraffin Wax Treatment in Western African Offshore Operations. OTC-36856, 2025.