Drilling Fluids Patents: Leaders, Trends & White Space 2026
- Filing has fallen sharply since 2017. Annual filings peaked at 359 in 2017 and have declined toward single digits by 2026, with the 2022 midpoint at 184 — a long, steady drop rather than a single cliff.
- Materials science, not drilling mechanics, dominates the claim space. C09K (materials for miscellaneous applications) covers 6,370 of the 7,981 families, well ahead of E21B (earth and rock drilling) at 3,680, meaning most contested claims are about formulation, not downhole equipment.
- Momentum is retreating even among the largest filers. Schlumberger-affiliated entities are down 60% and 25% year-on-year, and Halliburton and Saudi Arabian Oil Company show zero filings in the latest year after 100% year-on-year drops.
Filing growth compares 2021 (176 records) with 2024 (148) — 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 7,981 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families filed against drilling fluid, drilling mud and water-based mud terminology, cross-referenced against rheology control, shale inhibition, fluid loss, environmental compliance and lost circulation within the C09K8 and E21B21 classification space. It spans publications from 2015 through mid-2026, covering 7,981 total families across major receiving offices including the United States, Europe, Canada, WIPO, China and the United Kingdom.
Because publication typically lags filing by around 18 months, the 2025 and 2026 figures in any trend line understate actual filing activity for those years; the decline visible from 2017 onward is real, but the very last data points will revise upward as more applications publish.
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Filing trends and technology composition
Two views of the same 7,981 families: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A decade of retreat from a 2017 peak
Filings ran at 359 in 2017 and had fallen to 184 by the 2022 midpoint, continuing down to 13 by 2026 (a partial year). This is not a market in early growth; it is a mature filing space where the bulk of foundational claims were staked out years ago and activity is now thinning.
Materials claims outnumber drilling-equipment claims nearly two to one
C09K (materials for miscellaneous applications, including drilling fluid formulations) accounts for 6,370 records against E21B's 3,680 (earth and rock drilling apparatus and methods). Secondary classes — C04B ceramics and cement, C08F and C08L polymer chemistry, B01D separation, B01F mixing, and G01N testing — each sit under 350 records, marking them as narrower but still active supporting fields.
Shares are the percentage of the 7,981 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Drilling Fluids and Mud Systems with Eureka
This page is one run against one query. Ask Eureka your own question about drilling fluids and mud systems and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
Converting drilling mud to a gel-based lost circulation material mid-operation
A method of conversion of a water-based mud to a gel-based LCM quickly to control lost circulation in a lost circulation zone in a wellbore during continuous drilling with a drilling mud, the drilling mud comprises a volcanic ash, water, a de-foamer, a pH buffer, and a polymer. The method comprises the steps of entering the lost circulation zone, determining a lost circulation volumetric flow rate, metering a first amount of a binder into the drilling mud to create a binder containing mud, pumping the binder containing drilling mud into the wellbore, and suspending metering of the first amount of the binder to the drilling mud after a pre-defined regulating period of time.Filed by Saudi Arabian Oil Company, published as US20140353043A1.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6176323B1 | Drilling systems with sensors for determining properties of drilling fluid downhole | 861 |
| 2 | US20080060846A1 | Annulus pressure control drilling systems and methods | 364 |
| 3 | US4498995A | Lost circulation drilling fluid | 350 |
| 4 | US20040040746A1 | Automated method and system for recognizing well control events | 328 |
| 5 | US6702044B2 | Methods of consolidating formations or forming chemical casing or both while drilling | 325 |
| 6 | US4483399A | Method of deep drilling | 316 |
| 7 | US4836940A | Composition and method of controlling lost circulation from wellbores | 281 |
| 8 | US5314022A | Dilution of drilling fluid in forming cement slurries | 278 |
| 9 | US4099583A | Gas lift system for marine drilling riser | 268 |
| 10 | US5908814A | Drilling fluid additive and method for inhibiting hydration | 259 |
Citation counts here reflect influence within the searched corpus and skew toward older filings; they are a signal of foundational status, 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
Reading the trend and the classification data together points to a space with entrenched incumbents and thinning new activity, not open ground.
Peak filing activity is nine years behind
The 2017 peak of 359 annual filings has not been approached since; by the 2022 midpoint volume was already roughly half that, at 184. A filer entering now is working against a decade of accumulated claims rather than a growing field.
Formulation chemistry is more contested than equipment
Nearly 80% more records sit in materials science (C09K) than in drilling apparatus and methods (E21B), meaning fluid additive, rheology modifier and inhibitor chemistry claims are more densely occupied than mechanical or procedural drilling claims.
Large incumbents are pulling back, not just slowing
Several of the historically largest filers, including Halliburton Energy Services and Saudi Arabian Oil Company, show zero filings in the latest year after full year-on-year drops, while Schlumberger's affiliated entities are down 60% and 25% respectively.
Co-filing is rare and concentrated
Only 10 co-assignee pairs appear across the dataset, and the strongest pairing — Saudi Arabian Oil Company with Saudi Aramco's own services affiliate — occurs 91 times, suggesting joint filing is largely intra-group rather than cross-company.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to drilling fluids and mud systems, with the prior art for and against each one.
Who is filing, and who has stopped
Assignee activity in this space is now dominated by pullback rather than growth: the entities with the deepest historical portfolios are the ones showing the steepest year-on-year declines.
Schlumberger Technology Corporation
Still the most active filer in the latest year among tracked assignees, but down 60% year-on-year — a decline off a much larger historical base rather than a new entrant's ramp-up.
Halliburton Energy Services
Zero recorded filings in the latest year after a complete year-on-year drop. Combined with Saudi Arabian Oil Company's identical pattern, this signals that two of the historically largest filers have gone quiet in this specific claim space, at least in what has published so far.
King Fahd University of Petroleum and Minerals
The one academic institution with visible momentum data, still filing at a much-reduced rate. Its presence alongside major operators and service companies suggests some university-originated formulation work continues to feed into this space.
| Assignee | Recent year | YoY |
|---|---|---|
| Schlumberger Technology Corporation | 4 | -60% |
| Schlumberger Technology LLC | 3 | -25% |
| King Fahd University of Petroleum and Minerals | 1 | -92% |
| Halliburton Energy Services, Inc. | 0 | -100% |
| Saudi Arabian Oil Company (Saudi Aramco) | 0 | -100% |
| M-I L.L.C. | 0 | — |
| Baker Hughes Holdings LLC | 0 | — |
| Saudi Aramco Services Company | 0 | -100% |
Where to take this analysis
The aggregate trend and classification data point to specific next steps depending on whether the goal is freedom-to-operate, licensing, or identifying open filing ground.
Map claim scope on the most-cited prior art
The highest-citation records, including US6176323B1 and US4498995A, anchor large portions of the formulation and downhole-sensing claim space. A freedom-to-operate review should start with their independent claims before assessing newer filings.
Explore claim charts in EurekaTrack the pullback among major incumbents
Zero-filing years from Halliburton and Saudi Arabian Oil Company, alongside Schlumberger's declining pace, may reflect a shift toward trade secret protection or consolidation of filing strategy rather than reduced R&D. Monitoring their next 12-18 months of publications will clarify which it is.
Set up assignee monitoring in EurekaAssess the under-claimed branches directly
Filtration-based fluid-loss control and mixing equipment for shale-inhibitive muds show meaningfully lower filing density than the core C09K materials claims, making them worth a targeted prior-art search before committing R&D spend.
Run a white space search in EurekaCommon questions about drilling fluid patents
Filings peaked at 359 in 2017 and have fallen steadily since, reaching 184 by the 2022 midpoint and 13 by 2026. This pattern is typical of a claim space where foundational formulation and method patents were staked out early in the decade, leaving less new ground for follow-on filings. Some of the apparent drop in the most recent one to two years is also an artefact of publication lag, since patent applications typically take around 18 months to publish after filing, so 2025 and 2026 figures will revise upward over time. The underlying trend from 2017 to roughly 2022-2023 is nonetheless a genuine decline in filing activity.
Filing activity in this space is concentrated among a small group of large oilfield service companies and national oil companies, including entities affiliated with Schlumberger, Halliburton, Saudi Arabian Oil Company, and Baker Hughes. However, recent-year momentum data shows several of these same companies pulling back sharply, with Halliburton and Saudi Arabian Oil Company both showing zero filings in the latest recorded year. Schlumberger's affiliated entities remain the most active among tracked assignees but are also declining year-on-year, so historical volume and current filing pace tell different stories.
C09K covers materials for miscellaneous applications, which in this dataset means drilling fluid formulations, additives, rheology modifiers and inhibitor chemistry, and accounts for 6,370 of the 7,981 total records. E21B covers earth and rock drilling apparatus and methods, including downhole tools and drilling procedures, at 3,680 records. The heavier weighting toward C09K indicates that most patent activity in this field is about what goes into the fluid rather than the mechanical equipment used to deploy it, which matters for anyone assessing freedom to operate on a specific additive or formulation.
The classification data shows secondary technology areas with comparatively low filing density relative to the core C09K and E21B classes, including filtration-based fluid-loss control (B01D, 175 records), mixing and shear equipment specific to shale-inhibitive muds (B01F, 160 records), and polymer rheology modifiers filed outside the core materials classes (C08F and C08L, 329 and 143 records respectively). Lower density in a sub-area does not guarantee it is unclaimed, but it does suggest fewer entrenched independent claims to design around compared with the core formulation space. A targeted prior-art search in these specific sub-areas is a reasonable next step before committing R&D resources.
US20140353043A1, filed by Saudi Arabian Oil Company, claims a method of converting a water-based drilling mud into a gel-based lost circulation material during continuous drilling, using a volcanic ash, water, de-foamer, pH buffer and polymer combination, with a specific metering and suspension sequence for the binder. It does not block all lost-circulation approaches; it is specific to this conversion method and binder-metering sequence. Formulations using different base materials, different binder-delivery mechanisms, or that do not involve converting an existing mud in situ would likely fall outside its claim scope, though a full claim-by-claim comparison is needed to confirm freedom to operate for any specific alternative.
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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.