Microbial enhanced oil recovery (MEOR)

Microbial enhanced oil recovery injects engineered microbial consortia and nutrients into an oil reservoir to increase the fraction of oil recoverable from an existing well, typically by reducing oil viscosity, altering rock wettability, or producing biosurfactants that mobilize trapped oil. A single treated well can see enterprise-recoverable-reserve (EUR) expansion in the double digits, as documented in recent Delaware Basin field results, without the capital cost of new drilling. MEOR is a genuine but oligopolistic field: two US firms are the commercially dominant vendors selling MEOR as a service to independent oil producers, while the rest of the reservoir-microbiology landscape is dominated by national oil companies (Petronas, Daqing, Shengli among others) running in-house programs rather than buying from commercial vendors, plus academic research that has not translated into a broader vendor market.

The key directions of microbial enhanced oil recovery are:

1. In-situ microbial injection: injecting a microbial consortium and nutrient package directly into an existing well to stimulate biosurfactant production and oil mobilization downhole.
2. Biosurfactant-mediated recovery: microbially produced surfactants that reduce interfacial tension between oil and rock, mobilizing oil trapped by capillary forces.
3. Viscosity-reduction treatments: microbial metabolic activity that reduces the viscosity of heavy or waxy crude, improving flow toward the wellbore.
4. Reservoir souring management: a related microbial-reservoir-management discipline addressing hydrogen-sulfide generation from reservoir microbial activity, distinct from but adjacent to MEOR itself.

Sectoral value chain#

[Reservoir characterization] ──> [Microbial consortium selection] ──> [Injection treatment] ──> [In-reservoir biosurfactant production]
                                                                                │
                                                                      (oil mobilization)
                                                                                │
                                                                                ▼
[Incremental oil recovery] <─── [Production monitoring] <────────────────────┘

Value chain levels#

Cross-cutting technologies of the sector:

• Reservoir microbiology assessment: characterizing a reservoir’s native microbial population and chemistry to design an effective treatment.
• Engineered microbial consortia: selecting or engineering microbial strains for biosurfactant production or viscosity reduction under specific reservoir conditions.
• Field-scale injection logistics: the operational infrastructure for delivering a microbial treatment into an active production well without disrupting operations.

The category’s technology centers on selecting and delivering a microbial treatment matched to specific reservoir chemistry, with commercial success measured directly in incremental recoverable oil volume.

1. Field-validated EUR expansion:
   • Locus Bio-Energy’s 12-month Delaware Basin results provide a documented, field-scale measurement of MEOR’s commercial impact — a 15% EUR expansion with sustained production, the kind of quantified result that differentiates a commercially proven MEOR vendor from an early-stage or academic approach.
2. Biosurfactant and viscosity-reduction mechanisms:
   • The underlying biology — microbially produced surfactants reducing oil-rock interfacial tension, or metabolic activity reducing crude viscosity — is well-established science; the commercial differentiator is field-deployment reliability and consortium engineering for specific reservoir conditions.
3. Retrofit application to existing wells:
   • MEOR’s core commercial appeal is that it applies to already-drilled wells, offering incremental production without the capital cost of new drilling — a distinct value proposition from primary or even most secondary recovery methods.