Wellhead and Casing Head Equipment Patents: Leaders & Trends 2026
- 43.5% concentration. The top 5 ranked assignees hold 1,057 of the 2,432 records in scope — an oilfield-equipment field consolidated around a small set of established suppliers.
- Filing peaked in 2017. 105 records that year against 3 so far in the most recent partial year; 2021's 54 fell to 23 by 2024, a -57% move over that three-year span.
- One IPC subclass dominates. E21B (earth & rock drilling) appears in 92.7% of records, while F16L, F16J and smaller classes mark the narrower mechanical niches worth a closer look.
Filing growth compares 2021 (54 records) with 2024 (23) — 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 2,432 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Wellhead and casing head equipment sits at the mechanical interface between a well and the surface: casing hangers, wear bushings, metal seal rings, load shoulders, test plugs, tubing head spools and the annulus access ports that let operators monitor and intervene in the annulus. This landscape draws on 2,432 published records filed or published between 2015 and mid-2026 that combine wellhead, casing head or casing hanger terminology with these specific component and sealing terms, giving a component-level rather than a whole-wellhead view of the art.
Because publication trails filing by roughly 18 months, the last one to two years in any trend chart will always understate true filing activity; treat the most recent bars as provisional, not as evidence of a slowdown.
Filing trend and technology composition
Two views of the same 2,432 records: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017–2026
Filings peaked at 105 in 2017 and have declined since; 2021's 54 records fell to 23 by 2024, a -57% move over that three-year span. The 2025-2026 figures are still filling in as publications catch up with filings and should not be read as a continued fall.
IPC subclass composition
E21B (earth & rock drilling for wells) appears in 92.7% of the 2,432 records, confirming this is fundamentally downhole/wellbore hardware. Secondary subclasses — F16L pipes and fittings at 4.3%, F16J seals and gaskets at 3.6%, and smaller shares in B01D, C02F, F16K, B63B and G01M — mark where sealing, valve and marine-deployment claims concentrate outside the core drilling classification. Because records can carry multiple classes, these shares sum to more than 100% of the record total.
Shares are the percentage of the 2,432 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Wellhead and Casing Head Equipment with Eureka
This page is one run against one query. Ask Eureka your own question about wellhead and casing head equipment and every answer comes back with the patent numbers behind it.
Try EurekaA representative filing
US5025864A — Casing hanger wear bushing
A wear bushing for a casing hanger mounts to the bore of a casing hanger before the casing hanger is lowered into the well. The running tool for running the casing connects to the wear bushing. The wear bushing has a setting ring that connects to the seal for the casing hanger. The running tool has a setting sleeve that connects to the setting ring. The running tool will release from the wear bushing and the setting ring after the casing has been cemented and the seal set.Filed by Vetco Gray Inc., a Delaware corporation, granted 1991-06-25 — an early, foundational filing on wear-bushing/running-tool mechanics that later filings in this space have had to design around.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080128134A1 | Producing drive fluid in situ in tar sands formations | 261 |
| 2 | US20080174115A1 | Power systems utilizing the heat of produced formation fluid | 258 |
| 3 | US20090071652A1 | In SITU heat treatment from multiple layers of a tar sands formation | 245 |
| 4 | US6364024B1 | Blowout preventer protector and method of using same | 233 |
| 5 | US7635023B2 | Time sequenced heating of multiple layers in a hydrocarbon containing formation | 231 |
| 6 | US7562707B2 | Heating hydrocarbon containing formations in a line drive staged process | 224 |
| 7 | US7533719B2 | Wellhead with non-ferromagnetic materials | 219 |
| 8 | US20090014180A1 | Moving hydrocarbons through portions of tar sands formations with a fluid | 213 |
| 9 | US20090014181A1 | Creating and maintaining a gas cap in tar sands formations | 212 |
| 10 | US7540324B2 | Heating hydrocarbon containing formations in a checkerboard pattern staged process | 203 |
Citation counts favour older filings that have had more time to accumulate citations within this searched corpus; read them as a signal 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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Read together, the concentration, trend and classification data point to a mature mechanical field with a shrinking but still-active pool of new filings.
Claim space is occupied at the top
The top 5 ranked assignees account for 1,057 of the 2,432 records in scope, and the top 10 extend that to 59.0% (1,435 records). A new entrant filing broad casing-hanger or wellhead-seal claims is filing into dense prior art held by a handful of established suppliers.
Filing has cooled from its 2017 peak
After peaking at 105 records in 2017, filing activity fell to 54 by 2021 and to 23 by 2024 — a -57% move over that span. Several of the largest historical assignees show zero filings in the latest tracked year, which is consistent with a field where the core mechanical claims were staked out earlier.
One subclass, several sub-niches
E21B covers the overwhelming majority of records, but the smaller subclasses — F16L pipe fittings, F16J seals and gaskets, F16K valves — mark where component-level claims diverge from generic wellhead architecture and where more specific art is easier to isolate.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to wellhead and casing head equipment, with the prior art for and against each one.
Who holds the ground, and where it is open
A small group of legacy oilfield-equipment suppliers still holds most of the record volume, but recent-year filing activity across those same names has gone quiet — a signal worth checking against your own competitive set before assuming the space is closed.
A single largest filer, by a wide margin
The leading assignee holds 456 records against 133 at fifth place and 52 at tenth — a steep drop-off that marks this as a field with one dominant historical filer rather than several evenly matched rivals.
Legacy leaders have gone quiet recently
Several of the historically largest assignees in this ranking show zero filings in the latest tracked year, including one with a -100% year-over-year move. That does not mean the underlying equipment has stopped evolving, only that filing under these search terms has slowed for these particular filers.
Co-filing is limited but not absent
Ten co-assignee pairs appear in the data, with the strongest pairing showing 7 shared records. This points to occasional joint development between equipment makers and services or engineering partners rather than a norm of co-filing in this field.
| Assignee | Recent year | YoY |
|---|---|---|
| Vetco Gray Inc. | 0 | — |
| FMC Technologies Inc. | 0 | — |
| DRIL QUIP INC | 0 | — |
| Cameron International Corporation | 0 | -100% |
| ABB VETCO GRAY INC | 0 | — |
| Shell Oil Company | 0 | — |
| FMC Corporation | 0 | — |
| STINGER WELLHEAD PROTECTION INC | 0 | — |
Where to take this
The dataset points to specific next steps depending on whether you are scoping freedom-to-operate, tracking competitors, or looking for open claim space.
Run a freedom-to-operate check on the gate chips
The under-claimed sub-areas above are a starting point, not a clearance opinion — pull the actual claim sets citing US5025864A and its family before drafting around wear-bushing or setting-ring mechanics.
Explore in Patsnap Eureka →Watch for filing restarts among quiet legacy leaders
Several of the largest historical assignees show zero recent-year filings; a restart from any of them would signal renewed investment in a specific component class worth monitoring.
Track assignee activity in Patsnap Eureka →Cross-check IPC composition against your own claims
If your filings sit in F16L, F16J or F16K rather than core E21B, you are already in a thinner part of the art — verify that thinness holds at the claim level, not just the subclass level.
Compare IPC coverage in Patsnap Eureka →Common questions on wellhead and casing head patents
The ranking covers 100 companies, with the leading assignee holding 456 of the 2,432 records in scope compared with 133 at fifth place and 52 at tenth. The top 5 together account for 43.5% of all records and the top 10 for 59.0%, so ownership is concentrated among a small group of established oilfield-equipment suppliers rather than spread evenly. Several of these same leading assignees show zero filings in the most recent tracked year, which is worth checking against your own competitive intelligence before assuming continued dominance.
Filing peaked in 2017 at 105 records and has declined since, with 2021's 54 records falling to 23 by 2024 — a -57% move over that three-year span, which is the last period that can be treated as complete. Figures for 2025 and 2026 are still artificially low because publication typically lags filing by around 18 months, so they should not be read as evidence the decline is continuing. The honest read is a mature field with reduced but ongoing filing activity through 2024.
US5025864A, granted to Vetco Gray in 1991, covers a wear bushing that mounts inside a casing hanger bore before running into the well, together with the running-tool and setting-ring mechanism that releases it after cementing and seal-setting. It is one of the more heavily cited records in this corpus, which reflects its foundational position in casing-hanger running-tool mechanics rather than current commercial dominance. Anyone designing a new wear-bushing or setting-sleeve mechanism should review this filing and its citing family before finalising claim language.
E21B, covering earth and rock drilling for wells, appears in 92.7% of the 2,432 records in scope, confirming this is fundamentally wellbore hardware rather than surface piping or general valve technology. Smaller but still meaningful shares sit in F16L (pipes and fittings, 4.3%), F16J (seals and gaskets, 3.6%), and single-digit shares in B01D, C02F, F16K, B63B and G01M. Because a single record can carry several IPC codes, these percentages sum to more than 100% of the record total and should not be treated as mutually exclusive slices.
The clearest openings sit outside the dominant E21B claim mass, in the narrower component classes such as annulus access port instrumentation, metal seal ring wear monitoring, and subsea tubing head spool retrofits, where filing density is measurably lower. Co-filing between assignees is also limited, with only 10 co-assignee pairs recorded and the strongest showing just 7 shared records, suggesting joint development is not yet common practice here. Any white-space claim should still be checked against the citing family of the oldest, most-cited records before drafting, since foundational mechanical patents in this field date back decades.
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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.