Enhanced Oil Recovery Methods Patent Landscape 2026
The enhanced oil recovery methods patent field is concentrated among a small group of major energy companies and chemical suppliers, with Chevron USA holding the top position. Annual filing volume peaked in 2019 and has since eased substantially, placing the field in a post-peak, declining phase.
Chevron leads a concentrated field with a clear two-tier applicant structure
Chevron USA Inc holds the top-ranked position, followed by Saudi Arabian Oil Co and Shell Internationale Research Maatschappij BV in second and third place respectively. These three applicants, together with Shell Oil Co and GlassPoint Solar Inc, collectively represent the top five filers’ share of approximately 30% of the hundred largest filers’ combined total.
A clear tier gap separates the top three applicants from the rest of the ranked field. Chevron’s lead over the second-ranked Saudi Arabian Oil Co is meaningful, and the gap widens further down the ranking, indicating concentrated IP ownership rather than a broadly distributed competitive landscape.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Chevron USA Inc | 86 | |
| 2 | Saudi Arabian Oil Co | 68 | |
| 3 | Shell Internationale Research Maatschappij BV | 59 | |
| 4 | Shell Oil Co | 47 | |
| 5 | GlassPoint Solar Inc | 37 | |
| 6 | Board of Regents, The University of Texas System | 31 | |
| 7 | ConocoPhillips Co | 28 | |
| 8 | King Fahd University of Petroleum and Minerals | 24 | |
| 9 | Dow Global Technologies LLC | 23 | |
| 10 | Mobil Oil Corporation | 20 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Equinor Energy AS | 20 | |
| 12 | Ecolab USA Inc | 17 | |
| 13 | Stepan Company | 17 | |
| 14 | Montgomery Chemicals LLC | 17 | |
| 15 | Halliburton Energy Services Inc | 14 | |
| 16 | SPCM SA | 14 | |
| 17 | Baker Hughes Co | 14 | |
| 18 | CHEVRON RESEARCH & TECHNOLOGY CO | 14 | |
| 19 | Geo Fossil Fuels LLC | 13 | |
| 20 | Locus Oil IP Co LLC | 12 |
The leaders’ positions reflect long-standing operational commitments to thermal and chemical EOR — Chevron and Shell’s emphasis on wellbore and formation engineering (E21B) alongside specialty fluid chemistry (C09K) signals deep, integrated IP portfolios that would require significant investment to match.
Patent records from the most recent 18–24 months are subject to publication lag and are likely under-counted; the apparent further drop in 2024–2025 filings should not be read as confirmed acceleration of the decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity peaked in 2019 and has contracted sharply; well and formation technology dominates the IPC mix
The annual filing trend and IPC technology composition together reveal a field that has moved past its growth phase, with activity now concentrated in a narrow set of established technical domains.
Annual filing trend
Filings rose to a peak of 100 records in 2019, then fell sharply through 2021–2023, with figures for 2024 and 2025 affected by publication lag and likely understated. The multi-year window shows a contraction of approximately 49% in recent activity versus the prior period, consistent with a declining lifecycle stage. Do not interpret the 2025 figure as the final reading.
↗ Hover for values · click a bar to ask EurekaTechnology composition
E21B (Earth and rock drilling — wells) and C09K (materials for miscellaneous applications, principally oilfield chemistry) together dominate the IPC distribution by a wide margin, reflecting the field’s dual focus on downhole engineering and chemical flooding agents. C08F (addition polymers) forms a secondary cluster, consistent with polymer flooding activity. Branches such as F22B (steam generation), F24S (solar heat collectors), and G06F (digital data processing) are present but at substantially lower levels, representing adjacent technical threads.
↗ 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.
Enzyme enhanced oil recovery (EEOR) for cyclic ste…
The present disclosure relates to the release or recovery of subterranean hydrocarbon deposits and, more specifically, to a system for enhanced oil recovery (EOR), by utilizing stabilized enzymatic fluid and cyclic injection of steam or heated fluid into subterranean formations. (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Thermally-enhanced oil recovery method and apparatus | 464 |
| 2 | Gas fired radiant tube heater | 364 |
| 3 | Enhanced oil recovery system with a radiant tube h… | 300 |
| 4 | Profile control in enhanced oil recovery | 225 |
| 5 | Method and apparatus for tertiary recovery of oil | 223 |
| 6 | Carbon dioxide recovery | 213 |
| 7 | Enhanced oil recovery by in SITU gasification | 202 |
| 8 | Gas and oil production | 161 |
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 R&D investment decisions
The field’s maturity, concentration, and collaboration patterns point to limited greenfield opportunity in core EOR chemistry and wellbore engineering, but leave meaningful adjacent space in digitalization and renewable-heat integration.
Post-peak decline: field passed its 2019 high-water mark
The lifecycle stage is classified as Decline, with annual filings easing back from the 2019 peak. The recent-window contraction of 49% versus the prior period confirms that the field is no longer in growth. New entrants face a shrinking annual publication base, which typically signals consolidation rather than expansion of the competitive frontier.
Lifecycle: DeclineTop five filers hold 30% of the largest-filer pool — moderate-to-high concentration
The top five filers account for 30% of the combined total of the hundred largest filers, with Chevron USA alone at the head of the ranking. The tier gap between the top three (Chevron, Saudi Aramco, Shell) and the remainder is wide. This structure raises freedom-to-operate questions for new entrants in core wellbore and chemical-flooding claims, particularly in US and Canadian jurisdictions.
Concentration: HighShell entities are the most active co-filers; academia-industry links notable
The most active co-filing pair is Shell Internationale Research Maatschappij BV with Shell Oil Co (20 co-filed records), reflecting intra-group coordination. Saudi Arabian Oil Co collaborates with Aramco Services Co (8 records). Notably, the University of Texas System co-files with both Harcros Chemicals (7 records) and BASF (3 records), illustrating active academia-industry linkages in chemical EOR. GlassPoint Solar co-files with the Board of Trustees of Leland Stanford Junior University (3 records), connecting solar-thermal EOR to academic research.
Collaboration: ActiveUS-centric filing with limited Asia-Pacific and Middle East coverage
The United States is the dominant filing jurisdiction, followed by Canada, WIPO (PCT), and Europe (EPO). Australia and the United Kingdom hold secondary positions. China and India show relatively low counts despite being active EOR markets, suggesting either strategic under-filing or reliance on PCT routes. Malaysia (MY) and Norway (NO) appear, reflecting North Sea and Southeast Asian operational contexts.
Geography: US-dominantGo 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 |
| Saudi Arabian Oil Co | Aramco Services Co | 8 |
| Board of Regents, The University of Texas System | Harcros Chemicals Inc | 7 |
| ConocoPhillips Co | Sunnova Energy Ltd | 4 |
| Shell Oil Co | Schlumberger Holdings Ltd | 3 |
| Shell Oil Co | Schlumberger Technology Corp | 3 |
| Shell Oil Co | Schlumberger NV | 3 |
| BASF SE | Board of Regents, The University of Texas System | 3 |
| GlassPoint Solar Inc | Board of Trustees of Leland Stanford Junior University | 3 |
| Saudi Arabian Oil Co | Aramco Far East (Beijing) Business Services Co Ltd | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Chevron leads on well engineering; Saudi Aramco gaining momentum with polymer focus
The two dominant players differ in trajectory and technical emphasis: Chevron holds the largest portfolio but is on a declining trend, while Saudi Arabian Oil Co is growing and has a distinctive polymer-chemistry orientation.
Chevron USA Inc
Chevron USA Inc ranks first with 86 patent records, concentrated in E21B 43 (wellbore and formation engineering) and C09K 8 (oilfield specialty fluids). Its recent filing trend shows a decline of 11% versus the prior period, consistent with the field-wide contraction. Chevron’s portfolio spans the full EOR value chain from downhole mechanics to surface chemistry, making it the broadest incumbent in this space.
patent records: 86Saudi Arabian Oil Co
Saudi Arabian Oil Co ranks second with 68 patent records and is the only top-three player showing positive recent momentum, up 20% versus the prior period. Its technical focus leads with C09K 8 (oilfield chemistry) over E21B 43 (wellbore engineering), and it has a notable presence in C08F 220 (addition polymers, vinyl), reflecting a stronger emphasis on chemical and polymer flooding relative to Chevron. This trajectory and polymer orientation position Saudi Aramco as the most active challenger in the current cycle.
patent records: 68| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Chevron USA Inc | 17 | ▼ -11% |
| Saudi Arabian Oil Co | 24 | ▲ +20% |
| Dow Global Technologies LLC | 1 | ▲ new entrant |
Under-served branches: polymer chemistry, solar-thermal integration, and digital methods
Several IPC branches adjacent to the dominant E21B/C09K core show relatively sparse patent counts; these are observations of relative sparsity and are noted here for technical evaluation rather than as validated commercial opportunities.
F24S · Solar heat collectors for EOR steam generation
F24S (solar heat collectors) appears with a 1% share of the IPC distribution, despite GlassPoint Solar’s dedicated position in this space. Solar-thermal steam injection for heavy oil recovery has plausible technical value — reducing fuel consumption in steam-assisted gravity drainage — and a realistic entry path through integration with existing F22B (steam generation) and E21B (wellbore) IP. The sparse count suggests limited competition beyond GlassPoint’s focused portfolio, though any entry would need to account for GlassPoint’s existing claims.
Search this in Eureka →G06F · Digital data processing applied to EOR optimization
G06F (electric digital data processing) and the related G06N (AI-based computing) together account for a small combined share of the IPC distribution. Given the field-wide interest in reservoir simulation, production optimization, and real-time monitoring, the sparse patent count in digital methods relative to the physical-chemical core is an observation worth investigating. Entry would likely involve combining reservoir-engineering domain knowledge with machine learning optimization frameworks — a path accessible to both oil-and-gas majors and technology companies, though commercial viability in a declining-filing environment warrants scrutiny.
Search this in Eureka →How leaders differ by technology route across EOR sub-domains
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 36 · Earth & rock drilling (wells) | C08F 220 · Addition polymers (vinyl etc.) | E21B 47 · Earth & rock drilling (wells) |
|---|---|---|---|---|---|
| Chevron USA Inc | Strong · 81 | Strong · 59 | Emerging · 6 | Absent | Emerging · 7 |
| Saudi Arabian Oil Co | Strong · 47 | Strong · 64 | Moderate · 15 | Moderate · 21 | Emerging · 2 |
| Shell Internationale Research Maatschappij BV | Strong · 60 | Absent | Absent | Absent | Absent |
| Board of Regents, The University of Texas System | Strong · 30 | Strong · 28 | Absent | Absent | Absent |
| GlassPoint Solar Inc | Strong · 35 | Absent | Emerging · 7 | Absent | Emerging · 3 |
| Dow Global Technologies LLC | Strong · 23 | Strong · 21 | Absent | Absent | Absent |
Frequently asked questions
The corpus covers 444 patent families in scope across global jurisdictions, with the United States as the dominant filing destination.
Chevron USA Inc holds the top position with 86 patent records, focused on wellbore engineering (E21B 43) and oilfield specialty chemistry (C09K 8). Saudi Arabian Oil Co is second with 68 patent records and is the only top-three player showing a positive recent filing trend, up 20% versus the prior period.
No. The lifecycle stage is classified as Decline. Annual filings peaked at 100 records in 2019 and have since eased substantially, with a recent-window contraction of approximately 49% versus the prior period. Figures for the most recent 18–24 months are subject to publication lag and may be understated, but the overall trend is clearly post-peak.
The United States leads by a wide margin, followed by Canada, WIPO (PCT), and Europe (EPO). Australia and the United Kingdom hold secondary positions. China and India show relatively low filing counts despite being operationally relevant EOR markets.
The most-cited work covers thermally-enhanced oil recovery methods and apparatus (464 citations), gas-fired radiant tube heaters (364 citations), and enhanced oil recovery systems with radiant tube heating (300 citations). Profile control and tertiary recovery methods also appear prominently among the most-cited works.
The sparser IPC branches adjacent to the dominant E21B and C09K core include F24S (solar heat collectors), G06F (digital data processing), C08F (addition polymers), C07C (acyclic and carbocyclic compounds), and F22B (steam generation and boilers). These represent observations of relative sparsity; technical and commercial viability should be assessed independently before treating them as investment opportunities.
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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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