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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/miscible-gas-injection-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Gas EOR & CO2 StorageMiscible Gas Injection Patents: Who Files, Where They File, and What Is Still Open
- Concentrated at the top. the five most active assignees account for 44.6% of all 193 records in scope, and the leading ten reach 69.9%.
- Filing has cooled from its peak. activity peaked at 17 records in 2020 and fell from 11 in 2021 to 3 in 2024, a 73% drop over that span.
- Drilling and well-construction claims dominate. E21B covers 76.7% of records, while data-processing and geophysics classes each sit well under 20%.
193
Published Records
45%
Top-5 Share of All Records
-73%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (11 records) with 2024 (3) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 193 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
Miscible gas injection spans the physical mechanics of driving oil to a miscible state with an injected gas and the computational work of predicting when that state is reached. The search string underlying this dataset pulls records that combine minimum miscibility pressure, slim tube experiment and solvent slug design language with claims touching gas oil ratio, gravity segregation or asphaltene precipitation — the chemistry and reservoir-engineering vocabulary that separates this field from generic CO2 storage filings.
193 patent families published between 2015 and the 2026-07-31 cut-off sit in scope. Publication lags filing by roughly 18 months, so the most recent years understate real filing activity; 2024 is the last year that can be read as complete.
Filing activity and technology mix, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Miscible Gas Injection covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Numbers
Filing trend and technology composition
Two views of the same 193 records: how filing volume has moved year over year, and which IPC subclasses carry the claims.
Filing trend
Volume peaked at 17 records in 2020, then declined from 11 in 2021 to 3 in 2024 — a 73% fall across that three-year window. Because publication lags filing by around 18 months, 2025 and 2026 figures are still filling in and should not be read as a continuation of the decline.
Technology composition
E21B (earth and rock drilling) appears in 76.7% of the 193 records, confirming that most claims are anchored to wellbore mechanics rather than surface processing. C09K materials claims sit at 26.4%, and computational subclasses — G06F, G01V, G01N and G06G — together describe the prediction and monitoring layer around MMP and slug design, each well under a quarter of records on its own.
Shares are the percentage of the 193 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Miscible Gas Injection covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Miscible Gas Injection with Eureka
This page is one run against one query. Ask Eureka your own question about miscible gas injection and every answer comes back with the patent numbers behind it.
Try EurekaKey Patents
Most-cited records and a recent filing
Recent filing
US12516236B1 — Method of oil recovery from subsurface reservoirs using improved carbon dioxide enhanced oil recovery
KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
Filed by King Fahd University of Petroleum and Minerals and published 2026-01-06, this record claims mixing an ionic liquid with a hydrocarbon fluid containing crude oil, CO2 and water to reduce minimum miscibility pressure by at least 10%, targeting crude oil with asphaltene content of 5 wt.% or more.The asphaltene threshold and MMP-reduction figure are drawn directly from the claim language.
Highest-citation records in scope
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5725054A | Enhancement of residual oil recovery using a mixture of nitrogen or methane diluted with carbon dioxide in a … | 173 |
| 2 | US20110088895A1 | Downhole measurement of formation characteristics while drilling | 156 |
| 3 | US20090288881A1 | Methods and apparatus to form a well | 138 |
| 4 | US20060224369A1 | Performance prediction method for hydrocarbon recovery processes | 126 |
| 5 | US20100300682A1 | Computer-implemented systems and methods for screening and predicting the performance of enhanced oil recover… | 97 |
| 6 | US7006959B1 | Method and system for simulating a hydrocarbon-bearing formation | 97 |
| 7 | US4941533A | Subterranean permeability modification by using microbial polysaccharide polymers | 84 |
| 8 | US20060289157A1 | Gas-assisted gravity drainage (GAGD) process for improved oil recovery | 82 |
| 9 | US7289942B2 | Performance prediction method for hydrocarbon recovery processes | 77 |
| 10 | US20130081807A1 | Providing Equipment In Lateral Branches Of A Well | 60 |
Citation counts inside this corpus favour older filings that have had more years to accumulate references — treat them as a signal of influence on the field, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Miscible Gas Injection covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the data tells a filing team
Three findings that shape where a new application is likely to land, and how crowded that ground already is.
Concentration
69.9%
of records held by the top 10
A small group holds most of the ground
The leading assignee accounts for 27 records on its own, and the top ten together reach 135 of the 193 records in scope — 69.9%. A long tail of single- and few-filing entrants makes up the rest, which is where most freedom to operate sits.
Assignee ranking, 67 companies
Technology mix
76.7%
of records touch E21B
Wellbore mechanics anchors the field
Three in four records carry an E21B classification, meaning most claims are tied to drilling or well construction rather than surface-side gas processing. F25J gas liquefaction and separation appears in only 3.1% of records, suggesting the surface-plant side of miscible gas injection is comparatively thin ground.
IPC subclass shares, 193 records
Filing momentum
-73%
2021 to 2024
Volume has pulled back from its 2020 peak
Filings dropped from 11 in 2021 to 3 in 2024. Because publication lags filing by about 18 months, the most recent two years are not yet a reliable read on real activity, but the multi-year retreat from the 2020 peak of 17 is measured on complete years.
Filing trend, 2015-2026
Co-filing
10 pairs
co-assignee pairings identified
Collaboration is limited and clustered
Only ten co-assignee pairs appear across the dataset, and the strongest links sit within a single corporate family's affiliated entities rather than across competitors — this is a field where most assignees file alone.
Co-assignee pairs
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Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to miscible gas injection, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Miscible Gas Injection covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gate sits
Filing activity is dominated by a handful of oilfield services and major-IOC research arms, with a long tail of universities and smaller operators behind them.
Leader
27
records
The top-ranked assignee
The leading assignee holds 27 of the 193 records in scope, well ahead of fifth place at 11 — a gap wide enough that a new entrant is unlikely to challenge the top position through volume alone.
Assignee ranking
Mid-field
11 → 7
fifth to tenth place
A tight mid-field
Records held by fifth through tenth place run from 11 down to 7, a narrower spread than the gap to the leader — this is where oilfield services affiliates and major upstream research groups compete directly.
Assignee ranking
Receiving offices
United States 78
of publications
US filing dominates, PCT and EPO follow
The United States receives the largest share of publications, with WIPO (PCT) and European filings well behind, and Canada, Norway and Australia rounding out a jurisdiction mix that tracks major oil-producing and offshore basins.
Receiving offices
Recent-year momentum
| Assignee | Recent year | YoY |
|---|---|---|
| ExxonMobil Upstream Research Company | 0 | — |
| Sasol Chemicals GmbH | 0 | — |
| Chevron USA Inc | 0 | -100% |
| Schlumberger Technology BV | 0 | — |
| Services Petroliers Schlumberger SA | 0 | — |
| PRAD Research & Development Ltd | 0 | — |
| Schlumberger Holdings Ltd | 0 | — |
| University of Wyoming | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Miscible Gas Injection covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The concentration at the top and the thinner surface-processing classes both point to specific next steps for a filing or freedom-to-operate review.
Map claim scope against the leading assignees
Before drafting in the wellbore-mechanics space, check how the leading filers' claims are worded around MMP reduction and slug design — that is where 76.7% of records already sit.
Explore assignee claims in EurekaTest the surface-processing gap
F25J gas liquefaction and separation covers only 3.1% of records, a thin count relative to the rest of the field and worth a closer novelty check.
Run a white-space search in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Miscible Gas Injection covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on this landscape
The dataset ranks 67 companies by patent family count, and the leading assignee holds 27 of the 193 records in scope, well clear of the fifth-ranked company at 11. This gap means the leader has broad coverage rather than a single dominant claim, so a freedom-to-operate check needs to look across that assignee's full portfolio, not one patent. The top ten assignees together hold 69.9% of all records, so the rest of the field is a long tail of smaller filers.
Minimum miscibility pressure, or MMP, is the pressure above which an injected gas becomes miscible with reservoir oil, and it governs how much oil a gas-injection project can recover. Because MMP determines project economics, a large share of the patent activity in this dataset covers ways to measure, predict or lower it — including slim-tube experiment methods and, in more recent filings, chemical additives such as ionic liquids. The recent record US12516236B1 is a direct example, claiming an ionic-liquid additive that reduces MMP by at least 10% for high-asphaltene crude.
Filing peaked at 17 records in 2020 and then declined across complete years, falling from 11 records in 2021 to 3 in 2024 — a 73% drop over that span. Because publication lags actual filing by roughly 18 months, the 2025 and 2026 figures in the dataset are still incomplete and should not be read as confirming a continued slowdown. The safest reading is that filing has pulled back meaningfully from its 2020 peak, with the most recent trend still unresolved.
E21B, covering drilling and well construction, appears in 76.7% of the 193 records, making it the dominant claim area, while surface-side gas liquefaction and separation (F25J) appears in only 3.1%. Computational subclasses tied to prediction and monitoring — G06F, G01V, G01N and G06G — each sit under 20% individually, suggesting real-time optimisation and sensor-based monitoring around slug design and gravity segregation remain comparatively open. Any new filing strategy should treat these smaller shares as areas to investigate for novelty, not as evidence the technology is unimportant.
Ownership is concentrated but not monopolised: the top five assignees hold 44.6% of the 193 records in scope, and the top ten hold 69.9%, leaving roughly 30% spread across 57 or more smaller filers. Co-assignee filing is limited to just 10 identified pairs, and most of those pairs link affiliated entities within a single corporate group rather than separate competitors. This pattern suggests the field rewards independent filing over joint ventures, at least based on the co-assignee data captured here.
Answers are grounded in the same dataset. Derived from a Patsnap search on Miscible Gas Injection covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.