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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/oil-water-gas-three-phase-separation-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Surface Facilities & SeparationOil Water Gas Three Phase Separation Patents: Who Holds the Vessel Claims
- 66.7% of the 123 records in scope sit with just five assignees, and the top ten account for 92.7% — this is a concentrated field, not a fragmented one.
- Filings peaked in 2018 at 17 and the tracked growth window shows a -100% swing from 2021 to 2024, though publication lag means the last two years are still filling in.
- B01D separation processes cover 49.6% of records while E21B well-related claims sit at 35.0% — the two overlap heavily around wellsite and topside separator design.
123
Published Records
67%
Top-5 Share of All Records
-100%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (2 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 123 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This dataset tracks patent families addressing three-phase gravity separation of oil, water and gas — vessel internals, inlet momentum breakers, mist extractors, interface level control, antifoam chemical injection and sand accumulation management inside separator vessels. The search combines core separator-hardware terms with the specific process controls that distinguish a working three-phase system from a generic gas-liquid separator. Coverage runs from 2015 through the 2026-07-31 cut-off, spanning 123 published records.
Filing activity concentrates around a small number of assignees and a peak year already behind the field, which sets the tone for the sections that follow: who holds the claim space, what technology classes carry the weight, and where the documented white space actually sits.
Filing trend and technology composition, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Oil Water Gas Three Phase Separation 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 mix
Two views of the same 123 records: filings by year, and the IPC subclasses those filings carry. Because a single record can be tagged with several subclasses, the technology shares add up to more than 100% of the record total.
Filing trend, 2017–2026
Filings ran from 6 in 2017 to a peak of 17 in 2018. The tracked span from 2021 (2 filings) to 2024 (0 filings) shows a -100% change; because publication typically lags filing by around 18 months, 2025 and 2026 are not yet representative and should not be read as a further decline.
Technology composition by IPC subclass
B01D (separation processes) leads at 49.6% of records, followed by E21B (well and drilling equipment) at 35.0%. C02F (water treatment) and C10G (hydrocarbon refining) each sit at 24.4%, with B01J, G05D, B03C and C01B forming a smaller tail down to 7.3% — evidence of claims that touch magnetic/electrostatic separation and chemical composition rather than mechanical vessel design alone.
Shares are the percentage of the 123 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 Oil Water Gas Three Phase Separation covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Representative filing and most-cited prior art
Representative Filing
WO2015044436A1 — Coil wound heat exchanger and method of cooling a process stream
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
A coil wound heat exchanger has a shell enclosing a shell space, with a tubing assembly inside and a refrigerant distributor arranged gravitationally above it to allow a downward stream of liquid refrigerant. A liquid drain line at the gravitational low level drains non-evaporated refrigerant, a vapour chamber with its own inlet sits inside the shell space, and a vapour discharge line removes evaporated refrigerant from the shell.Filed by Shell Internationale Research Maatschappij B.V., 2015-04-02.
Most-cited records in this landscape
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080017369A1 | Method and apparatus for generating pollution free electrical energy from hydrocarbons | 161 |
| 2 | US20060054318A1 | Method and apparatus for generating pollution free electrical energy from hydrocarbons | 119 |
| 3 | US20040011523A1 | Method and apparatus for generating pollution free electrical energy from hydrocarbons | 117 |
| 4 | US6820689B2 | Method and apparatus for generating pollution free electrical energy from hydrocarbons | 117 |
| 5 | US4236406A | Method and apparatus for sonic velocity type water cut measurement | 94 |
| 6 | US4579565A | Methods and apparatus for separating gases and liquids from natural gas wellhead effluent | 86 |
| 7 | US6183540B1 | Method and apparatus for removing aromatic hydrocarbons from a gas stream prior to an amine-based gas sweeten… | 58 |
| 8 | US20140027386A1 | Fracture Water Treatment Method and System | 57 |
| 9 | US7575672B1 | Sled mounted separator system | 42 |
| 10 | US20190211274A1 | Gas oil separation plant systems and methods for rag layer treatment | 33 |
Citation counts reflect influence within this searched corpus and skew toward older filings; they are not a measure of current commercial importance.
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 Oil Water Gas Three Phase Separation 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 numbers mean for a filing decision
Three findings that shape where a new filing has room to stand, and where it will sit on top of dense prior art.
Concentration
66.7%
of 123 records held by top 5
A small group holds most of the claim space
With the top five assignees combined controlling 66.7% of all 123 records and the top ten reaching 92.7%, this is not a fragmented field with room for many parallel entrants. A new filer is more likely to be designing around an incumbent's claims than filing into open territory.
Based on the 36-company ranked list returned by the dataset.
Filing momentum
17 in 2018
peak year, then a documented drop to 2024
Activity peaked years ago, not now
The peak year so far is 2018 at 17 filings, and the tracked window from 2021 to 2024 shows a -100% change. Because publication lags filing by roughly 18 months, the most recent years understate true activity, but the peak itself is real and already behind the field.
Trend covers 2017–2026, data cut-off 2026-07-31.
Technology overlap
49.6% + 35.0%
B01D and E21B share of records
Separation hardware and wellsite equipment overlap heavily
B01D (separation processes) and E21B (well and drilling equipment) are the two largest subclasses, and their combined presence across roughly half to a third of records respectively points to claims that span topside separator internals and downhole or wellsite equipment together, rather than treating them as separate domains.
Shares are of the 123-record total; a record may carry both classes.
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to oil water gas three phase separation, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Oil Water Gas Three Phase Separation 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
The assignee ranking returned 36 companies, counted in records. The leader holds 30 records; by fifth place that figure is down to 11, and by tenth place, 4 — a steep drop-off rather than a gentle taper.
Leader
30 records
top-ranked assignee
One assignee sets the pace by a wide margin
The leading assignee holds 30 records against a fifth-place figure of 11 and a tenth-place figure of 4, meaning the gap between first and fifth is larger than the gap between fifth and the bottom of the ranked list.
Ranking is of patent families, 36 assignees total.
Mid-field
11 records
fifth-ranked assignee
A thin mid-tier before the long tail begins
Assignees ranked around fifth place hold roughly a third of the leader's volume, and the count falls further to single digits by tenth place, consistent with a field where a handful of firms did the sustained work and most others filed opportunistically.
Top 10 combined: 114 records, 92.7% of all 123 in scope.
Recent activity
0 in latest year
across tracked assignees
No assignee shows fresh momentum yet
Recent-year momentum figures for the tracked assignees all read zero in the latest year, which is consistent with publication lag rather than a genuine stop in R&D — filings made in 2024 and 2025 are still working through to publication.
Momentum reflects publication dates, not filing dates.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| MERICHEM CO | 0 | — |
| Steeper Energy | 0 | — |
| Merichem Co | 0 | — |
| Saudi Arabian Oil Co (Saudi Aramco) | 0 | — |
| Petroliam Nasional Bhd (Petronas) | 0 | — |
| University of Sheffield | 0 | — |
| SARADA STEVEN A | 0 | — |
| NGLTECH | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Oil Water Gas Three Phase Separation 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
The numbers point to a concentrated field with a documented peak behind it. The next step depends on whether you are filing, licensing, or scoping a design-around.
Map a specific claim against the leader's portfolio
With one assignee holding 30 of 123 records, checking a draft claim against that portfolio first will save more rework than a broad novelty search.
Run a claim comparison in Patsnap Eureka →Scope the under-claimed branches before filing
Antifoam injection control, non-optical interface sensing and magnetic/electrostatic emulsion breaking carry lighter documented density than the core B01D vessel claims.
Explore white space in Patsnap Eureka →Track publication as the lag clears
2025 and 2026 filings are still working through to publication; revisit the trend once the 18-month lag has cleared to see whether the 2018 peak has been matched.
Set a monitoring alert in Patsnap Eureka →Source: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Oil Water Gas Three Phase Separation 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 ranked list returns 36 assignees, with the leader holding 30 of the 123 records in scope. The top five assignees combined hold 66.7% of all records, and the top ten hold 92.7%, so filing activity is heavily concentrated rather than spread evenly across the field. A company assessing freedom to operate should prioritise checking the leader's portfolio before working through the long tail.
The peak year so far is 2018, with 17 filings, and the tracked window from 2021 to 2024 shows a -100% change. However, publication lags filing by roughly 18 months, so the low counts in 2025 and 2026 mostly reflect applications that have not yet published rather than an actual stop in R&D. Judging the trend on the strength of the last two years alone would be misleading.
B01D, covering separation processes generally, appears on 49.6% of the 123 records, making it the single largest subclass. E21B (well and drilling equipment) follows at 35.0%, with C02F (water treatment) and C10G (hydrocarbon refining) each at 24.4%. Because a record can carry multiple IPC classes, these figures add up to more than 100% and should be read as overlapping claim territory rather than mutually exclusive buckets.
The documented sub-areas with lighter filing density relative to the core vessel-hardware claims include antifoam chemical injection control, non-optical interface level sensing, in-vessel sand accumulation monitoring, and magnetic or electrostatic emulsion breaking under B03C, which appears on only 7.3% of records. A first claim in one of these branches is more likely to sit on open ground than a claim on inlet momentum breakers or mist extractors, where filing density is already high.
The United States leads with 40 filings among the receiving offices tracked, followed by Europe (EPO) with 15, and Australia and Canada each with 12. WIPO (PCT) filings total 12, and India accounts for 5. This spread suggests the technology is pursued primarily through US and European protection with PCT used for broader coverage, rather than a strategy concentrated in a single regional office.
Answers are grounded in the same dataset. Derived from a Patsnap search on Oil Water Gas Three Phase Separation 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.