Water-Based Drilling Fluid Patents: Top Companies & Trends 2026
- 48.0% of all 791 records sit with just five assignees, so the core shale-inhibition and fluid-loss claim space is already dense before you draft.
- Filing fell 33% from 2021 to 2024 (27 to 18 records), the last three-year span complete enough to read as a real trend rather than a publication-lag artefact.
- C09K covers 90.1% of records while narrower classes like C02F (water treatment, 2.5%) and C08B (polysaccharides, 2.0%) barely register — a sign of where claims have not concentrated.
Filing growth compares 2021 (27 records) with 2024 (18) — 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 791 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Water-based drilling fluid systems sit at the intersection of oilfield chemistry and wellbore mechanics: additive packages that inhibit clay swelling, control fluid loss, adjust rheology and disperse cuttings in an aqueous or brine-based carrier. The search underlying this page combines carrier-fluid terms (aqueous drilling fluid, polymer drilling fluid, potassium chloride mud) with the functional problems those fluids are built to solve (shale inhibition, clay swelling, fluid loss additive, rheology modifier). It returns 791 published records spanning 2015 through the current data cut-off.
Filing offices skew heavily toward the United States, with meaningful volume also routed through Canada, the WIPO PCT track, the UK, the EPO and Australia — consistent with a technology tied to onshore shale plays and offshore drilling programmes across those jurisdictions.
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Filing trend and technology composition
The filing curve and the IPC breakdown together show a field that built up quickly, peaked, and has since cooled — while claim density stays concentrated in one dominant materials class.
A peak in 2018, then a real pullback
Annual filings ran from 15 records in 2017 up to a peak of 27 in 2018. The only span long enough to trust as a trend rather than noise is 2021 to 2024, where filings dropped from 27 to 18 records — a 33% decline. Years after 2024 are still filling in under the roughly 18-month publication lag and should not be read as confirming a continued fall.
One materials class dominates
C09K (materials for miscellaneous applications) appears on 90.1% of the 791 records, with E21B (earth and rock drilling) close behind at 34.4%. Everything else — addition polymers, cement chemistry, polymer compositions, water treatment, acyclic compounds, polysaccharides — sits under 10%, meaning most granular chemistry work is filed as a variant within C09K rather than staked out under its own subclass.
Shares are the percentage of the 791 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Water Based Drilling Fluid Systems with Eureka
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Try EurekaA recent claim worth reading in full
Clay swelling inhibition using acrylic acid functionalized cellulose diacrylate carbon nanocomposite
A method of clay swelling inhibition includes contacting an aqueous drilling fluid with a subterranean geological formation. The fluid includes an acrylic acid functionalized cellulose diacrylate carbon nanocomposite (AA-Cellulose-NC) material at 0.1 to 2 wt.% of the aqueous drilling fluid. The material deposits on and binds to the formation's inner surface, forming a hydrophobic filter cake layer that reduces clay swelling.Filed by King Fahd University of Petroleum and Minerals, published 2025-07-24 as US20250236778A1.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20060116296A1 | Shale Inhibition additive for oil/gas down hole fluids and methods for making and using same | 193 |
| 2 | US5337824A | Coal slag universal fluid | 173 |
| 3 | US20060194700A1 | Corrosion inhibitor systems for low, moderate and high temperature fluids and methods for making and using sa… | 160 |
| 4 | US20100193244A1 | Drilling Fluid Additive for Reducing Lost Circulation in a Drilling Operation | 137 |
| 5 | US20070173414A1 | Well drilling fluids having clay control properties | 133 |
| 6 | US5208216A | Acrylamide terpolymer shale stabilizing additive for low viscosity oil and gas drilling operations | 133 |
| 7 | US5789349A | Water-based drilling fluids with high temperature fluid loss control additive | 127 |
| 8 | US4142595A | Shale stabilizing drilling fluid | 127 |
| 9 | US7268100B2 | Shale inhibition additive for oil/gas down hole fluids and methods for making and using same | 126 |
| 10 | US6291405B1 | Glycol based drilling fluid | 126 |
Citation counts reward older filings that have had more time to accumulate citing art; treat them as a measure of influence within this corpus, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Four figures matter more than the rest for deciding where to file and where to watch.
The core is already crowded
Five assignees hold 380 of the 791 records in scope. That concentration sits on the foundational shale-inhibition and fluid-loss additive claims — the ones most-cited in this dataset — so a new filing there is competing directly with entrenched art rather than filling a gap.
Volume has pulled back, not vanished
The three-year span from 2021 to 2024 is the most recent one complete enough to trust, and it shows a real decline in filing volume. That is consistent with a technology area where the dominant additive chemistries are already staked out and incremental filing has slowed.
Depth in one class, thin elsewhere
C09K alone touches 90.1% of records, but classes tied to water treatment (C02F, 2.5%) and polysaccharide chemistry (C08B, 2.0%) are barely represented. That gap is either an opportunity or a sign those approaches have not proven commercially durable — the record count alone will not tell you which.
US-anchored with real PCT volume
The United States leads receiving-office volume at 278 records, with Canada, WIPO/PCT, the UK, the EPO and Australia all carrying meaningful counts. The PCT volume (82) signals that a material share of applicants are pursuing multi-jurisdiction protection rather than filing US-only.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to water based drilling fluid systems, with the prior art for and against each one.
Who is filing, and where the activity has gone quiet
The ranked leaders show a field with a clear top tier and a long tail of single- or few-filing entrants, and recent-year momentum data suggests even the leaders have slowed.
One filer well ahead of the pack
The leading assignee's 219 records outpace the fifth-place filer's 23 by nearly an order of magnitude, then the count flattens into a long tail across the rest of the 100 ranked companies.
A workable second tier, not a monopoly
Positions five through ten hold enough volume to matter competitively, even if none approach the leader's scale. That tier is where licensing conversations and freedom-to-operate checks are most likely to surface a real blocking claim.
Even leaders have gone quiet recently
Several of the most active historical filers, including the field leader, show zero filings in the most recent tracked year. Given the 18-month publication lag this partly reflects timing, but it is consistent with the broader 2021-to-2024 pullback rather than contradicting it.
| Assignee | Recent year | YoY |
|---|---|---|
| Halliburton Energy Services, Inc. | 0 | — |
| Saudi Arabian Oil Co. (Saudi Aramco) | 0 | — |
| M-I L.L.C. | 0 | — |
| ClearWater International, LLC | 0 | — |
| Nalco Company | 0 | — |
| King Fahd University of Petroleum and Minerals | 0 | -100% |
| Chevron Phillips Chemical Company LP | 0 | — |
| Baker Hughes Holdings LLC | 0 | — |
Turning this landscape into a filing decision
A count of records tells you where the crowd is, not whether a specific claim is available to you.
Run a freedom-to-operate check on the top tier
With 48.0% of records held by five assignees, any new filing in shale inhibition or fluid-loss control needs a claim-by-claim check against that concentrated art, not just a keyword search.
Explore prior art with EurekaTest the under-claimed branches for real demand
Low record counts in classes like C02F and C08B could mean open space or a chemistry that never worked in the field. Model the claim language before committing R&D budget.
Draft and compare claims in EurekaCommon questions about this landscape
One assignee leads the ranked field with 219 records, well ahead of the fifth-place filer at 23. The top five assignees combined hold 380 records, or 48.0% of the 791 records in scope, meaning nearly half the field's patent activity sits with a small group of companies. Beyond the top ten (59.3% combined), the remaining 90 ranked companies form a long tail with only a handful of filings each, so competitive risk is concentrated rather than evenly spread.
Filing peaked in 2018 at 27 records and has since pulled back; the most recent complete three-year comparison, 2021 to 2024, shows a 33% decline from 27 to 18 records. Data from 2025 onward is still incomplete because publication typically lags filing by about 18 months, so it should not yet be read as confirming further decline. On the evidence available, the honest read is a cooling field rather than a growing one.
C09K (materials for miscellaneous applications) touches 90.1% of the 791 records and E21B (earth and rock drilling) touches 34.4%, making these the densest claim space. Narrower classes tied to water treatment (C02F, 2.5%), polysaccharide chemistry (C08B, 2.0%) and acyclic/carbocyclic compounds (C07C, 2.1%) are lightly claimed by comparison. That gap can mean either genuine white space or chemistries that have not proven out commercially, and record counts alone will not distinguish the two.
The United States leads with 278 tracked filings, followed by Canada (93), the WIPO PCT route (82), the United Kingdom (77), the European Patent Office (70) and Australia (60). The strong PCT count indicates a meaningful share of applicants are pursuing multi-jurisdiction protection rather than filing in a single market. This spread lines up with regions with active onshore shale and offshore drilling programmes.
US20250236778A1, filed by King Fahd University of Petroleum and Minerals and published July 2025, claims an acrylic acid functionalized cellulose diacrylate carbon nanocomposite added at 0.1 to 2 wt.% to an aqueous drilling fluid, forming a hydrophobic filter cake that inhibits clay swelling. It represents a cellulose-nanocomposite approach to a problem — clay swelling inhibition — that older, heavily cited filings in this dataset addressed with different chemistries. Its narrow concentration range and specific material composition mean it blocks that exact formulation route, not the broader clay-inhibition function, leaving room for alternative nanocomposite or polymer chemistries.
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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.