EOR Reservoir Characterization Patent Landscape 2026
The EOR reservoir characterization patent space is concentrated among integrated oil majors and oilfield-services groups, with Shell-affiliated entities and Saudi Aramco accounting for the largest shares. Activity peaked in 2019 and has eased significantly since, placing the field in a late-stage decline phase with pockets of activity in geophysics and digital methods remaining relatively sparse.
Shell and Saudi Aramco lead a concentrated field of oil-industry incumbents
Shell Internationale Research Maatschappij BV holds the top position in applicant rankings, followed closely by Saudi Arabian Oil Co, Shell Oil Co, Chevron USA Inc, and Mobil Oil Corp — all established hydrocarbon producers or their subsidiaries.
The top five filers account for 32% of the combined patent records of the hundred largest filers, indicating moderate-to-high concentration: a clear tier gap separates the Shell and Aramco cluster from the mid-tier oilfield-services and specialty-chemicals players.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Shell Internationale Research Maatschappij BV | 54 | |
| 2 | Saudi Arabian Oil Co | 46 | |
| 3 | Shell Oil Co | 38 | |
| 4 | Chevron USA Inc | 28 | |
| 5 | Mobil Oil Corp | 24 | |
| 6 | BP Exploration Operating Co Ltd | 19 | |
| 7 | Schlumberger Tech Corp | 19 | |
| 8 | Services Petroliers Schlumberger SA | 18 | |
| 9 | Chevron Oronite Co LLC | 18 | |
| 10 | ConocoPhillips Co | 18 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | GeoQuest Systems BV | 16 | |
| 12 | Schlumberger Canada Ltd | 14 | |
| 13 | GEO Fossil Fuels LLC | 13 | |
| 14 | Charm Industries Inc | 12 | |
| 15 | Stepan Company | 12 | |
| 16 | Landmark Graphics Corp | 11 | |
| 17 | Board of Regents, The University of Texas System | 11 | |
| 18 | University of Kansas | 9 | |
| 19 | BOARD OF SUPERVISORS OF LOUISIANA STATE UNIV & AGR… | 9 | |
| 20 | Harcros Chemicals Inc | 8 |
The dominance of integrated majors signals that core EOR characterization IP has been built primarily as proprietary operational capability rather than through open licensing or startup activity, raising the entry cost for new challengers in the primary IPC classes.
The most recent 18–24 months of filing data are subject to publication lag and likely undercount current activity; any apparent trough in 2025–2026 should not be interpreted as a structural shift. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing volume peaked in 2019; well-engineering IPC classes dominate the technology mix
The annual trend chart captures a clear build-up from 2017 to the 2019 peak followed by sustained easing, while the technology-composition chart reveals that two IPC branches — well engineering (E21B) and specialty materials (C09K) — together account for the overwhelming majority of tagged records.
Annual filing trend
Filings climbed from 19 records in 2017 to a peak of 47 in 2019, then declined to the low teens by 2022–2023. A modest uptick to 19 appears in 2024, though the 2025–2026 bars reflect publication lag and should be treated as incomplete rather than indicative of a sustained recovery.
↗ Hover for values · click a bar to ask EurekaTechnology composition
E21B (Earth and rock drilling — wells) and C09K (materials for miscellaneous applications, principally EOR fluid formulations) together constitute the core of the corpus. G01V (geophysics and gravity surveying), G06F (digital data processing), C07C (acyclic and carbocyclic compounds), and G01N (material analysis and testing) each appear at significantly lower shares, marking them as adjacent rather than dominant branches.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
A quantitative method of determining safe steam in…
A method for determining the safe steam injection pressure for enhanced oil recovery operations by using reservoir simulation and the geomechanical models for performing a parametric simulation run that are coupled together. Models can be one-way coupled, fully- coupled, or iteratively coupled by being divided into a number of time steps. For the reservoir… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | Disposal of produced formation fines during oil re… | 316 |
| 2 | Enhanced oil recovery using electrical means | 314 |
| 3 | Oil recovery by enhanced imbitition in low permeab… | 282 |
| 4 | Hydrocarbon recovery methods by creating high-perm… | 168 |
| 5 | Sulfonated internal olefin surfactant for enhanced… | 149 |
| 6 | Distillative processing of CO2 and hydrocarbons fo… | 137 |
| 7 | Sweep improvement in enhanced oil recovery | 115 |
| 8 | Method of enhanced oil recovery from geological re… | 110 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for EOR R&D investment decisions
Four structural features — life-cycle stage, applicant concentration, collaborative ecosystems, and geographic focus — shape where new IP investment is likely to find differentiated space.
Decline stage: annual volume has eased sharply from the 2019 peak
The lifecycle evidence classifies this field as Decline, with annual filings easing back from the 47-record peak reached in 2019. On a multi-year basis the corpus of 199 patent families remains meaningful, but the downward trajectory suggests that incumbent players are harvesting rather than expanding their core positions. New entrants should target sub-domains that have not yet followed the same arc.
Lifecycle: DeclineTop five hold 32% of the hundred largest filers’ records — clear tier gap
Shell Internationale Research Maatschappij BV, Saudi Arabian Oil Co, Shell Oil Co, Chevron USA Inc, and Mobil Oil Corp form a distinct lead tier. The gap to the next cluster — BP Exploration, Schlumberger entities, Chevron Oronite, and ConocoPhillips — is measurable but not insurmountable in adjacent IPC classes. Mid-tier chemical and university filers suggest that specialty-chemistry and academic routes remain more accessible.
High concentrationIntra-group co-filing dominates; one notable cross-sector academic link
The most active co-filing pair is Shell Internationale Research Maatschappij BV with Shell Oil Co (20 joint records), followed by several Schlumberger-family pairings (Services Petroliers Schlumberger with GeoQuest Systems BV at 11, and multiple other Schlumberger entity combinations ranging from 6–8 records each). The one cross-sector collaboration of note is ConocoPhillips with University of Kansas (5 records), signalling a potential academic entry route for EOR fluid and characterization research. Saudi Arabian Oil Co co-files with Aramco Services Co (4 records).
Intra-group dominantUnited States is the primary filing office; PCT and EPO provide secondary reach
The United States leads all filing jurisdictions by a wide margin, followed by Canada, WIPO PCT, and Europe (EPO). Australia, the United Kingdom, and India form a secondary ring, consistent with active hydrocarbon basins and established IP enforcement systems in those markets. The near-absence of Chinese filings (1 record) is notable given China’s significant EOR activity and may reflect deliberate portfolio decisions by incumbents or a gap in coverage worth monitoring.
US-centricGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Shell Internationale Research Maatschappij BV | Shell Oil Co | 20 |
| Services Petroliers Schlumberger SA | GeoQuest Systems BV | 11 |
| Services Petroliers Schlumberger SA | Schlumberger Canada Ltd | 8 |
| Schlumberger Tech Corp | Schlumberger Canada Ltd | 7 |
| Schlumberger Tech Corp | Services Petroliers Schlumberger SA | 7 |
| Services Petroliers Schlumberger SA | Schlumberger Technology BV | 7 |
| Services Petroliers Schlumberger SA | Schlumberger Holdings Ltd | 6 |
| Chevron Oronite Co LLC | SA TEXACO BELGIUM NV | 6 |
| ConocoPhillips Co | University of Kansas | 5 |
| Saudi Arabian Oil Co | Aramco Services Co | 4 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Shell and Saudi Aramco lead; Schlumberger entities show new-entrant momentum
The applicant landscape is anchored by two hydrocarbon-producer clusters — Shell-affiliated entities and Saudi Aramco — each covering the core E21B and C09K IPC space. Recent momentum signals suggest that Schlumberger/SLB entities are beginning to file in this space as new entrants, while Saudi Aramco’s recent filing rate has eased.
Shell Internationale Research Maatschappij BV
Shell Internationale Research Maatschappij BV holds the top-ranked position with 54 patent records, concentrated in E21B 43 (55 sub-records) and C09K 8 (11 sub-records), reflecting a dual focus on well-engineering methods and EOR fluid materials. The entity co-files extensively with Shell Oil Co (20 joint records), suggesting coordinated portfolio management across the Shell group rather than independent filing programmes.
54 patent recordsSaudi Arabian Oil Co
Saudi Arabian Oil Co ranks second with 46 patent records and shows the broadest technology spread among the top applicants, covering E21B 43 (45 sub-records), C09K 8 (37 sub-records), and C07C 233 (5 sub-records) — indicating investment in surfactant and chemical EOR characterization alongside well-engineering methods. Recent momentum shows a decline of 38% versus the prior period, suggesting the organisation is consolidating rather than expanding this portfolio in the near term.
46 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Saudi Arabian Oil Co | 13 | ▼ -38% |
| Schlumberger Tech Corp | 2 | ▲ new entrant |
| Services Petroliers Schlumberger SA | 3 | ▲ new entrant |
Geophysics sensing and AI-driven reservoir modelling are under-served relative to core drilling IP
Against the dominant E21B and C09K branches, several IPC classes carry relatively sparse record counts, making them worth examining as areas where differentiated IP could be built with less head-to-head competition from established majors.
G01V · Geophysics and gravity surveying
With 52 patent records this is the third-largest branch but still a small fraction of the E21B total, and no single applicant appears to hold a dominant position here. Seismic and geophysical characterisation directly underpins EOR sweep efficiency analysis, and the cross-company pairing of Schlumberger’s Services Petroliers entity with GeoQuest Systems BV (which focuses on G06F and G01V) suggests this sub-domain is technically adjacent and commercially relevant. An entrant with advanced sensor or inversion-algorithm IP could occupy differentiated ground without displacing the core well-engineering majors.
Search this in Eureka →G06N · Computing based on AI models
Only 20 patent records tag this branch, representing roughly 2% of IPC-tagged records in the corpus — the sparsest of the digitally oriented classes. Given the broader industry trend toward machine-learning-assisted reservoir simulation and production optimisation, the low count likely reflects timing rather than lack of technical value: most AI-for-reservoir work may be filed under E21B or G06F rather than G06N specifically. An organisation capable of combining subsurface domain expertise with modern machine-learning architectures could establish a credible position in this branch before the incumbents pivot their AI programmes toward EOR-specific characterization tasks.
Search this in Eureka →How leading applicants differ across EOR characterization technology routes
Route coverage across the main technology branches in the current evidence set.
| Player | E21B 43 · Earth & rock drilling (wells) | C09K 8 · Materials for misc. applications | E21B 49 · Earth & rock drilling (wells) | E21B 47 · Earth & rock drilling (wells) | E21B 41 · Earth & rock drilling (wells) |
|---|---|---|---|---|---|
| Saudi Arabian Oil Co | Strong · 45 | Strong · 37 | Absent | Absent | Absent |
| Shell Internationale Research Maatschappij BV | Strong · 55 | Emerging · 11 | Absent | Absent | Absent |
| Chevron USA Inc | Strong · 25 | Moderate · 11 | Absent | Absent | Emerging · 5 |
| Mobil Oil Corp | Strong · 21 | Strong · 19 | Absent | Absent | Absent |
| Shell Oil Co | Strong · 33 | Absent | Emerging · 3 | Absent | Absent |
| BP Exploration Operating Co Ltd | Strong · 19 | Strong · 10 | Absent | Absent | Absent |
| GEO Fossil Fuels LLC | Strong · 13 | Strong · 13 | Absent | Absent | Absent |
Frequently asked questions
The corpus examined contains 199 patent families in scope, spanning filings from multiple major hydrocarbon-producing and oilfield-services organisations across more than 15 jurisdictions.
Shell Internationale Research Maatschappij BV ranks first with 54 patent records, closely followed by Saudi Arabian Oil Co with 46 patent records. Shell Oil Co, Chevron USA Inc, and Mobil Oil Corp complete the top five.
Annual filing volume peaked in 2019 at 47 records and has eased substantially since, placing the field in a Decline stage. The most recent 18–24 months of data are subject to publication lag and should be treated as incomplete; the structural downward trend from the 2019 peak is nonetheless clear.
The United States leads all filing jurisdictions by a wide margin, followed by Canada, WIPO PCT, and Europe (EPO). Australia, the United Kingdom, and India form a secondary ring. Chinese filings represent only a single patent record in the corpus.
G01V (geophysics and gravity surveying, 52 records), G06F (electric digital data processing, 33 records), G01N (material analysis and testing, 28 records), and G06N (computing based on AI models, 20 records) all carry substantially lower record counts than the dominant E21B and C09K branches, making them adjacent areas with less incumbent crowding.
The most active co-filing relationship is between Shell Internationale Research Maatschappij BV and Shell Oil Co (20 joint records), reflecting coordinated intra-group portfolio management. Within the Schlumberger group, Services Petroliers Schlumberger and GeoQuest Systems BV co-filed 11 records. The most notable cross-sector pairing is ConocoPhillips with University of Kansas, which jointly filed 5 records, pointing to an academic channel for EOR fluid and characterization research.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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