Subsea Production System Patents: Who Leads, Where Gaps Are 2026
- Filing already peaked. 2018 recorded 37 filings, the high point of the series; by the 2022 midpoint annual filing had fallen to 7, and the curve has stayed flat or declining since.
- Claim space is lopsided. 301 of 302 records sit under E21B (earth & rock drilling), with only thin secondary activity in separation (B01D), pipe fittings (F16L) and marine vessels (B63B) — the adjacent branches are barely claimed.
- The US filters the field. United States is the largest receiving office (87 records), ahead of the UK (50), EPO (39) and WIPO/PCT (34), with Norway still drawing a meaningful 23 filings tied to North Sea operators.
Top-5 share is the combined record count of the five largest assignees divided by all 302 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent families published between 2015 and mid-2026 that combine subsea production system, subsea tree or subsea processing terminology in the title/abstract with completion-specific language — subsea completion, subsea wellhead, sand control, intelligent completion — under the core drilling and well-engineering IPC codes (E21B43, E21B33/035, E21B43/08). The 302 families captured represent the documented claim space around how a subsea well is completed, controlled and tied back to a tree, not the broader subsea hardware market.
Filing activity is concentrated late in the last decade rather than the current one: publication lags filing by roughly 18 months, so the last one or two years in any trend chart will always look thinner than they eventually turn out to be. Read the recent-year numbers as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 302-family dataset: the year-by-year filing curve, and how those families distribute across IPC subclasses beyond the core well-engineering code.
A peak behind us, not ahead
Filings ran at 19 in 2017, climbed to a peak of 37 in 2018, then eased toward the 2022 midpoint of 7. The shape is a bulge-and-decline rather than a steady ramp, consistent with a technology area where the core mechanical claim space filled early and later years show maintenance-level activity rather than fresh land grabs.
One dominant code, several thin adjacents
E21B (earth & rock drilling for wells) carries 301 of the 302 records — effectively the entire dataset. Everything else is secondary: separation processes (B01D, 18), pipe fittings (F16L, 16), marine vessels (B63B, 13), water treatment (C02F, 9), and single-digit counts in hydraulic engineering, hydrocarbon refining and fuels. That imbalance is itself a finding — see the white-space discussion below.
Shares are the percentage of the 302 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Subsea Production System Well Completion with Eureka
This page is one run against one query. Ask Eureka your own question about subsea production system well completion and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
US20050121198A1 — Subsea completion system and method of using same
The present invention is directed to various embodiments of a subsea production system. In one illustrative embodiment, a subsea completion system includes a tubing string, a Christmas tree defining a bottom opening adapted to have the tubing string inserted therein, and means for latching the tubing string to prevent movement relative to the Christmas tree. A method includes coupling a tubing string with a Christmas tree above water and landing the Christmas tree on a subsea wellhead.Filed by FMC Technologies, Inc.; published 2005-06-09. Its claim scope around above-water tree/tubing coupling followed by subsea landing is a reference point for later completion-sequence claims in this dataset.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7093661B2 | Subsea production system | 134 |
| 2 | US6460621B2 | Light-intervention subsea tree system | 128 |
| 3 | US20030145991A1 | Subsea production system | 118 |
| 4 | US5992526A | ROV deployed tree cap for a subsea tree and method of installation | 100 |
| 5 | US20020070026A1 | Light-intervention subsea tree system | 90 |
| 6 | US6698520B2 | Light-intervention subsea tree system | 60 |
| 7 | US20090260829A1 | Subsea tree safety control system | 58 |
| 8 | US7086467B2 | Coiled tubing cutter | 54 |
| 9 | US20080093081A1 | Method for Managing Hydrates in Subssea Production Line | 52 |
| 10 | US7073593B2 | Method of drilling and operating a subsea well | 52 |
Citation counts inside a searched corpus favour older filings simply because they've had more years to accumulate citations — read this as a map of influence, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three read-outs from the dataset that matter more for strategy than the raw counts alone.
The land grab is over
Annual filings fell from a 2018 peak of 37 to 7 by the 2022 midpoint, and the trend stays flat through the most recent complete years. New entrants now face a mechanical claim space that was largely staked out a decade ago, not an open field.
Almost everything sits on one code
E21B captures nearly the entire dataset, leaving separation, pipe-fitting, marine-vessel and water-treatment overlaps in single or low-double digits. That skew suggests the completion-hardware claims are dense while the process-integration angles around them are comparatively open.
Norway punches above its size
The US leads as receiving office with 87 records, but Norway's 23 stands out against the UK (50), EPO (39) and WIPO (34) — a filing footprint that tracks North Sea operator activity rather than general market size.
Collaboration is rare and thin
Only six co-assignee pairs appear across 302 families, and none exceeds two shared filings. Most patenting in this space happens inside a single corporate entity rather than through joint filings or visible cross-licensing structures.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to subsea production system well completion, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| FMC Technologies, Inc. (US) | FMC Corporation (US) | 2 |
| Cameron International Corporation | JUNE DAVID | 2 |
| Subsea IP UK Limited (OneSubsea) | ONESUBSEA LLC | 1 |
| 2H OFFSHORE ENG | LIM FRANK | 1 |
| 2H OFFSHORE ENG | HOWELLS HUGH | 1 |
| 2H OFFSHORE ENG | HATTON STEPHEN ANTHONY | 1 |
With co-assignment this thin, competitive tracking should focus on individual assignee portfolios rather than joint-venture filing patterns.
Who holds the claim space
Recent-year momentum across the tracked assignees is uniformly at zero, which is consistent with the broader filing decline rather than any single company exiting the field. That makes portfolio depth — not filing velocity — the more useful signal right now.
FMC-linked entities anchor the citation base
FMC Technologies, Inc. and related FMC assignee records include some of the most-cited prior art in the dataset, including the representative subsea completion filing. Their recent-year filing count sits at zero, consistent with the field's overall slowdown rather than a retreat from the technology.
OneSubsea and Cameron-linked filings persist as a cluster
Subsea IP UK Limited (OneSubsea) (OneSubsea IP) and Cameron International Corporation (Cameron) appear among the co-assignee pairs, pointing to shared filing activity from the consolidated Schlumberger/Cameron subsea lineage rather than independent parallel R&D.
Petróleo Brasileiro S.A. (Petrobras) files as an operator, not just a service company
Petróleo Brasileiro S.A. (Petrobras) (Petrobras) is tracked among the named assignees, reflecting operator-driven patenting around completion practice — a pattern worth watching separately from the equipment-vendor filings that dominate the rest of the dataset.
| Assignee | Recent year | YoY |
|---|---|---|
| Subsea 7 Norway AS | 0 | — |
| Subsea IP UK Limited (OneSubsea) | 0 | — |
| FMC Technologies, Inc. (US) | 0 | — |
| FMC Corporation (US) | 0 | — |
| Vetco Gray Inc. | 0 | — |
| Petróleo Brasileiro S.A. (Petrobras) | 0 | — |
| 2H OFFSHORE ENG | 0 | — |
| Cameron International Corporation | 0 | — |
Where to take this
The dataset points to a mature core and a thin periphery. Turning that into a filing or freedom-to-operate decision means going deeper on specific claims and specific gaps.
Map the E21B claim boundaries precisely
Before filing anything under the core completion codes, get a claim-by-claim view of what the most-cited records actually cover, not just that they're cited.
Explore claims in Eureka →Test a white-space angle against prior art
The under-claimed branches above are candidates, not guarantees. Run a specific draft claim against the full corpus before committing R&D time to it.
Run a novelty check in Eureka →Common questions about this landscape
The most-cited records in this dataset trace back to FMC Technologies and its related assignee entities, whose filings on subsea tree systems and completion sequencing accumulated over 100 citations each. That said, high citation counts favour older filings simply because they've had longer to be cited, so treat this as a map of historical influence rather than a ranking of current market leaders. Co-assignee data also shows a small cluster around OneSubsea and Cameron, reflecting the consolidated Schlumberger/Cameron subsea lineage.
No. Filings peaked at 37 in 2018 and had fallen to 7 by the 2022 midpoint of the tracked period, with the trend staying flat to declining since. Publication lag of roughly 18 months means the very latest years will always look artificially thin, but the multi-year decline predates that lag effect. This points to a technology area where the core mechanical claim space filled early rather than one still in an active land-grab phase.
301 of the 302 tracked families sit under the core E21B drilling code, leaving adjacent process areas — produced-water separation tie-ins, riserless sand-control tooling, marine-vessel-integrated deployment — with only single-digit representation. That imbalance suggests the mechanical tree-and-wellhead hardware is densely claimed while the integration points between subsea completion and adjacent process equipment are comparatively open. Any first claim in those branches should be checked against the full corpus before drafting, since low counts don't guarantee true novelty.
The US recorded 87 records, the largest single receiving office, ahead of the UK (50), EPO (39) and WIPO/PCT (34). Norway also stands out with 23, a footprint disproportionate to its size that tracks North Sea operator and vendor activity rather than general market scale. Filing office distribution here reflects where subsea completion equipment is engineered and deployed — the Gulf of Mexico and North Sea basins — more than where litigation risk is highest.
US20050121198A1, filed by FMC Technologies, describes a subsea completion system in which a tubing string is latched to a Christmas tree above water before the assembled unit is landed on a subsea wellhead. Its claim scope centres on that specific sequence — surface-coupling followed by subsea landing — and the latching means that prevents tubing movement relative to the tree. A design that completes the tubing-to-tree connection subsea rather than above water, or that uses a different movement-restraint mechanism, sits outside its literal claim language, though a full freedom-to-operate check should confirm that against the current claim set, not the abstract.
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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.