Subsea Flow Assurance Patents: Top Companies & Filing Trends 2026
Filing growth compares 2021 (3 records) with 2024 (0) — 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 246 records in scope (CR5), not by the ranked leaders only.
What the subsea flow assurance patent record shows
Subsea flow assurance covers the hardware, chemistry and monitoring systems that keep hydrocarbons moving through subsea pipelines and risers without hydrate plugs, wax deposits or scale interrupting flow. The 246 records in scope span 2015 through mid-2026 and cluster heavily around well intervention and drilling-adjacent engineering rather than pure chemistry or materials science, a pattern the IPC composition makes explicit. Publication lags filing by roughly 18 months, so the tail end of this window understates true recent activity.
Filing concentrated around a mid-decade peak and has since fallen off steeply, while the assignee ranking shows a small group of long-standing oilfield services and operators holding the bulk of the family count. That combination — high concentration at the top, a shrinking recent filing rate, and one IPC class dominating the claim space — is the shape a reader needs to interpret before deciding where a new filing might actually clear.
Filing trend and technology composition
These figures come directly from the 246 records in scope and the IPC classes assigned to them; a single record can carry more than one class, so class shares sum to more than 100%.
A peak, then a sharp drawdown
Filings rose from 6 in 2017 to a peak of 8 in 2019, then declined; the documented three-year span from 2021 (3 filings) to 2024 (0 filings) marks a full reversal, a -100% change the page's own trend card confirms. Because 2025 and 2026 filings are still publishing, treat the most recent two years as incomplete rather than as evidence the field has stopped.
One class carries three-quarters of the field
E21B (earth and rock drilling for wells) appears in 74.4% of all 246 records, far ahead of E02D, B63B and C09K, each near 6-8%. That imbalance means most flow assurance claims are being drafted and prosecuted as drilling-adjacent inventions, and any freedom-to-operate search that skips E21B will miss the bulk of the prior art.
Shares are the percentage of the 246 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Subsea Production Systems: Subsea Flow Assurance Patent Landscape with Eureka
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Try EurekaThe most-cited records anchoring this field
Subsea flow assurance in multifunctional pipe-in-pipe system (US20190064854A1)
A technique provides for management of multiple flow assurance functionalities in a pipe-in-pipe system. A station for use in a subsea pipe-in-pipe system may comprise an inner flow conduit to provide an inner flow passage for a first fluid and an outer flow conduit to provide an annular flow passage for a second fluid. The station also may comprise a network of valves and conduits coupled to the inner flow conduit and to the outer flow conduit, individually adjustable to enable selection of multiple flow assurance functionalities so as to ensure continued fluid flow capability following a plug.Filed by OneSubsea IP UK Limited, published 2019-02-28.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20040168811A1 | Subsea chemical injection unit for additive injection and monitoring system for oilfield operations | 220 |
| 2 | US20030056954A1 | Methods and apparatus for a subsea tie back | 138 |
| 3 | US6772840B2 | Methods and apparatus for a subsea tie back | 110 |
| 4 | US7234524B2 | Subsea chemical injection unit for additive injection and monitoring system for oilfield operations | 108 |
| 5 | US20070035736A1 | Spectral imaging for downhole fluid characterization | 106 |
| 6 | US20060144595A1 | Remote delivery of latex drag-reducing agent | 90 |
| 7 | US20070114372A1 | Water detection and 3-phase fraction measurement systems | 71 |
| 8 | US20120085544A1 | Marine subsea free-standing riser systems and methods | 65 |
| 9 | US20160251940A1 | High power laser flow assurance systems, tools and methods | 60 |
| 10 | WO2004016904A1 | Subsea chemical injection unit for additive injection and monitoring system for oilfield operations | 59 |
Citation counts favour older filings that have had more time to accumulate citations inside this corpus; read them as a signal of influence on later filers, not as a measure of present-day relevance.
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Browse MCP servers →What the concentration and citation data mean for a filing decision
Three patterns in this dataset matter more than any single ranking: how tightly filings concentrate at the top, how steeply recent activity has fallen, and which IPC class actually carries the claim density.
The field is not fragmented at the top
Five assignees hold 126 of the 246 records in scope, with the leader alone at 40. A newcomer filing in this space is filing against a small set of entrenched portfolios rather than a diffuse crowd of small players.
Recent filing activity has fallen to zero on the last complete year
The documented drop from 3 filings in 2021 to 0 in 2024 is a full reversal of momentum. Because publication lags filing, 2025-2026 counts will fill in further, but the 2024 baseline itself is the last year that can be read with confidence.
Drilling-adjacent claims dominate the field
E21B outweighs every other class by a wide margin, meaning the densest prior art sits in well-drilling-style claim language rather than in materials or instrumentation classes, which each sit under 8%.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to subsea production systems: subsea flow assurance patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| BP Corp North America Inc | BP Exploration Operating Co Ltd | 17 |
| Schlumberger Holdings Limited | Schlumberger Technology LLC | 8 |
| Schlumberger Holdings Limited | Schlumberger Limited | 8 |
| Schlumberger Technology LLC | Schlumberger Limited | 8 |
| Schlumberger Holdings Limited | Schlumberger Canada Limited | 7 |
| Schlumberger Technology LLC | Schlumberger Canada Limited | 7 |
| Schlumberger Holdings Limited | Prad Research and Development Limited | 6 |
| Schlumberger Technology LLC | Prad Research and Development Limited | 6 |
Co-assignee pairs are rare in this dataset (10 identified pairs total), and the strongest links sit within single corporate groups — evidence of internal portfolio structuring more than cross-company joint filing.
Where to take this analysis
The figures above answer where activity has concentrated; deciding whether a specific claim clears prior art requires a closer read of the records themselves.
Map the drilling-class prior art directly
With 74.4% of records sitting in E21B, any new filing in flow assurance needs a targeted search of that class before scope is drafted, not a general keyword sweep.
Search E21B prior art in EurekaWatch the top assignees, not the whole field
With 51.2% of records held by five companies, tracking those portfolios' recent office actions and continuations tells you more than monitoring the full 100-company ranking.
Track leading assignees in EurekaRe-check the 2025-2026 filing count later
Because publication lag means the most recent years are still incomplete, revisit the trend once 2025 filings finish publishing before concluding the field has gone quiet.
Set a filing alert in EurekaCommon questions on subsea flow assurance patents
The assignee ranking for this dataset covers 100 companies across 246 records, and it is heavily front-loaded: the top 5 assignees together hold 126 records, or 51.2% of the total, with the single leader holding 40 records on its own. Names in the ranking include established oilfield services firms and operators such as FMC Technologies, BP's exploration units, Baker Hughes and Halliburton, alongside more specialised players like Single Buoy Moorings and Fuglesangs Subsea. That level of concentration means a new entrant is likely to encounter one of a handful of large portfolios in almost any flow-assurance freedom-to-operate search.
Filing peaked in 2019 at 8 records and has fallen sharply since; the clearest documented span is 2021 to 2024, where filings dropped from 3 to 0, a complete reversal over three years. That said, publication typically lags actual filing by around 18 months, so the 2025 and 2026 figures in any dataset are still incomplete and should not be read as confirmation the field has stopped. The honest read is that recorded activity has cooled from its 2019 high, with the most recent trend line still filling in.
The dominant class is E21B, covering earth and rock drilling for wells, which appears in 74.4% of all 246 records in scope. Other classes appear at much lower shares: E02D (foundations and earth drilling) at 7.7%, B63B (ships and marine vessels) and C09K (materials for miscellaneous applications) each at 6.1%, and G01N (material analysis and testing) at 4.9%. Because a single record can carry multiple IPC classes, these shares add up to more than 100%, and a thorough prior-art search needs to cover E21B specifically rather than relying on flow-assurance keyword searches alone.
US20190064854A1, assigned to OneSubsea IP UK Limited and published 28 February 2019, describes a pipe-in-pipe subsea station with an inner flow conduit and an outer annular flow conduit, connected through a network of individually adjustable valves that let an operator select among multiple flow-assurance functions after a plug forms. The claim scope centres on that valve-network architecture for managing more than one flow-assurance function within a single pipe-in-pipe structure. Designs that avoid a pipe-in-pipe configuration, or that manage each flow-assurance function through physically separate lines rather than a shared adjustable-valve network, sit outside its likely claim scope, though a formal freedom-to-operate opinion would need to check the full claim set and prosecution history.
The smaller IPC classes point to the gaps: G01L (force and pressure measurement) sits at 4.1% of records, F04D (non-positive-displacement pumps) at 3.7%, and B08B (general cleaning) at just 3.3%, all far below E21B's 74.4%. Filing that centres real-time pressure or flow-rate sensing integrated directly into pipe-in-pipe or riser hardware, rather than as a bolt-on instrumentation package, sits in noticeably less crowded claim space than the dominant drilling-adjacent classes. That gap is consistent with the low co-assignee count of 10 pairs, which suggests few companies are jointly developing across these adjacent branches.
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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.