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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/invert-emulsion-and-synthetic-drilling-fluids-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Drilling Fluid SystemsInvert Emulsion and Synthetic Drilling Fluid Patents: Who Leads and Where the Field Is Open
- Concentrated at the top. the top 5 assignees hold 61.0% of all 720 records in scope, and the top 10 hold 73.2% — a small group of oilfield services and majors controls most of the claim space.
- Filing has cooled from its 2019 peak. filings ran from 31 in 2017 to a peak of 33 in 2019, and the tracked 2021-to-2024 window shows an 8-to-6 decline, a -25% shift, though 2025-26 figures are still filling in due to publication lag.
- Material science outweighs downhole mechanics. C09K (materials for miscellaneous applications) appears on 74.7% of records versus 42.1% for E21B (earth and rock drilling), showing most invention effort sits in fluid formulation, not tool design.
720
Published Records
61%
Top-5 Share of All Records
-25%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (8 records) with 2024 (6) — 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 720 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 landscape maps 720 patent records filed against invert emulsion mud, synthetic-based mud and oil-based mud, filtered to documents that also address emulsion stability, electrical stability testing, oil-water ratio, organophilic clay, wettability alteration or base oil viscosity. The scope spans formulation chemistry, rheology modifiers and the test methods used to qualify a mud system for field use, rather than the drilling hardware itself.
Records were pulled from receiving offices led by the United States, the European Patent Office, Canada, WIPO's PCT route, Australia and Norway — a spread consistent with offshore and unconventional drilling activity concentrated in North America, the North Sea and the Middle East.
Filing activity and technology composition, 2015 to 2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Invert Emulsion and Synthetic Drilling Fluids 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
The Data
Filing trend and technology composition
Two views of the same 720-record dataset: filing activity by year, and how records distribute across IPC subclasses. Because a single record can carry several IPC codes, the class shares below add up to more than 100% of the record total.
Filing trend: rise, 2019 peak, and a cooling tail
Filings climbed from 31 in 2017 toward a peak of 33 in 2019, then eased; the tracked 2021-to-2024 comparison shows 8 falling to 6, a -25% move. Treat 2025 and 2026 as undercounted — publication typically lags filing by around 18 months, so recent years will fill in as more records publish.
Technology composition: materials chemistry dominates
C09K (materials for miscellaneous applications, largely fluid formulation) covers 74.7% of the 720 records, well ahead of E21B (drilling and wells) at 42.1%. Smaller but distinct clusters sit in condensation polymers (C08G, 5.7%), hydrocarbon oil refining (C10G, 5.4%), separation processes (B01D, 5.1%), cement and ceramics (C04B, 3.3%), magnetic/electrostatic separation (B03C, 3.2%) and geophysical surveying (G01V, 3.2%).
Shares are the percentage of the 720 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 Invert Emulsion and Synthetic Drilling Fluids covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Most-cited records in the corpus
Representative Filing
Synergistic organophilic clay mixture as an additive to oil-based drilling fluids (US20160186034A1)
BAKER HUGHES INCORPORATED
An organophilic clay mixture having a first organophilic clay that is modified attapulgite clay and/or modified sepiolite clay, together with an organophilic modified bentonite clay, may be used as a rheological additive to improve the ultra-low shear rate viscosity of oil-based or synthetic oil-based drilling fluids (O/SBMs) and to increase the carrying capacity of the oil mud, while reducing the high shear rate readings. The clays are modified by treating them with quaternary amines and/or quaternary ammonium salts. The organophilic clay mixture significantly yields stable gels that are non-progressive compared to each individual organophilic clay used separately.Filed by Baker Hughes; illustrates the field's recurring pattern of claiming specific clay-modifier combinations rather than the general concept of organophilic clay rheology additives.
Citation leaders
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5189012A | Oil based synthetic hydrocarbon drilling fluid | 184 |
| 2 | US5213160A | Method for conversion of oil-base mud to oil mud-cement | 170 |
| 3 | US6218342B1 | Oil-based drilling fluid | 149 |
| 4 | US5382290A | Conversion of oil-base mud to oil mud-cement | 149 |
| 5 | US5977031A | Ester based invert emulsion drilling fluids and muds having negative alkalinity | 145 |
| 6 | US6063737A | Aqueous displacement fluid compositions for use in wellbores | 140 |
| 7 | US6534449B1 | Removal of wellbore residues | 133 |
| 8 | US20050049147A1 | Flat rheology drilling fluid | 129 |
| 9 | US20100263863A1 | Microemulsions Used as Spacer Fluids | 127 |
| 10 | US5888944A | Oil-based drilling fluid | 122 |
Citation counts inside a searched corpus favour older filings that have had more time to accumulate references — read this as a signal of influence on the field, not 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 Invert Emulsion and Synthetic Drilling Fluids 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 patterns stand out once concentration, timing and technology composition are read together.
Concentration
61.0% / 73.2%
top 5 / top 10 share of 720 records
A narrow group controls most of the claim space
The top 5 assignees hold 61.0% of all 720 records in scope, and the top 10 combined reach 73.2%. That leaves a long tail of single- or few-filing entrants competing for the remaining share, which signals that broad formulation claims are largely staked out and new entrants should look for narrow, defensible combinations rather than platform-level claims.
Based on the full 720-record assignee ranking.
Momentum
8 → 6 (-25%)
2021 to 2024 filings
Activity has eased from its 2019 peak
Filings peaked at 33 in 2019 and the tracked 2021-to-2024 window shows a decline from 8 to 6, a -25% move. Recent-year momentum among the largest historical filers shows several at zero in the latest full year, though 2025-26 counts remain incomplete due to publication lag and should not be read as a stopped field.
2024 is the most recent year treated as complete.
Technology mix
74.7% vs 42.1%
C09K vs E21B share of 720 records
Formulation chemistry outweighs drilling mechanics
C09K materials claims appear on 74.7% of records against 42.1% for E21B drilling and wells classifications. Secondary clusters in condensation polymers, hydrocarbon refining, separation processes and cement chemistry each sit under 6%, suggesting formulation additives and stability testing are the crowded ground, while some adjacent processing routes remain comparatively lightly claimed.
Class shares sum above 100% because records can carry multiple IPC codes.
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to invert emulsion and synthetic drilling fluids, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Invert Emulsion and Synthetic Drilling Fluids 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 holds the ground and what is still open
The assignee ranking covers 100 companies counted by record share, not a top-50 or top-100 cut — it is the complete set the data endpoint returns. A handful of oilfield services majors dominate by volume, but the co-assignee pairs and recent-year momentum figures suggest most of the largest historical filers have slowed in the most recent complete years.
Leader
262 records
leading assignee
One filer well ahead of the field
The top-ranked assignee holds 262 of the 720 records in scope, far ahead of fifth place at 27 and tenth place at 15. That gap indicates a single company built a defensive filing programme around invert emulsion and synthetic mud chemistry over an extended period, rather than the field being an even contest among several comparably sized filers.
Leader vs fifth place: 262 vs 27 records.
Collaboration
10 co-assignee pairs
joint-filing relationships identified
Collaboration is limited and mostly internal
Only 10 co-assignee pairs appear in the dataset, and the strongest pairings link a company with its own regional service affiliate or named inventors rather than cross-company joint ventures. This points to filing strategies built around single corporate entities rather than shared research programmes.
Strongest pair recorded jointly on 5 records.
Momentum
0 in latest year
several top-10 assignees
Even the largest filers show a quiet recent year
Several of the historically largest assignees show zero filings in the latest tracked year, including year-over-year drops as steep as -100% for at least one major filer. Given the roughly 18-month publication lag, this likely reflects incomplete recent-year data rather than a genuine stop in R&D activity.
Recent-year figures are provisional pending further publication.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| M-I L.L.C. | 0 | — |
| Chevron Phillips Chemical Company LP | 0 | -100% |
| Halliburton Energy Services, Inc. | 0 | — |
| Saudi Arabian Oil Co. (Saudi Aramco) | 0 | — |
| M I DRILLING FLUIDS L L C | 0 | — |
| Baker Hughes Holdings LLC | 0 | — |
| BP Exploration Operating Co Ltd | 0 | — |
| The Lubrizol Corporation | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Invert Emulsion and Synthetic Drilling Fluids 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 analysis
The dataset points to where formulation claims are dense and where they are thin. Two directions follow from that.
Stress-test a formulation idea against the leader's portfolio
With one assignee holding 262 of 720 records, any new organophilic clay, emulsifier or base-oil formulation should be checked against that filer's claim scope before drafting, not just against the general prior art.
Run a freedom-to-operate check in EurekaMap the under-claimed branches to a first draft claim
The magnetic/electrostatic separation and geophysics-linked clusters sit near 3% of records each, well below the C09K core — a specific starting point for a narrow independent claim.
Explore white space in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Invert Emulsion and Synthetic Drilling Fluids 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
One assignee leads the field with 262 of the 720 records in this dataset, well ahead of the fifth-ranked filer at 27 and the tenth at 15. The top 5 assignees combined hold 61.0% of all records, and the top 10 combined hold 73.2%, so the field is concentrated among a small group of oilfield services companies and majors. A long tail of smaller filers holds the remaining share, typically with a handful of records each.
Filing peaked at 33 records in 2019 after rising from 31 in 2017, and the tracked 2021-to-2024 window shows a decline from 8 to 6 filings, a -25% move. Figures for 2025 and 2026 look low but are not yet reliable, because publication typically lags filing by around 18 months. Read the recent tail as incomplete rather than as evidence the technology area has stopped attracting R&D investment.
Most records sit in C09K, materials for miscellaneous applications, covering 74.7% of the 720 records in scope — this is where fluid formulation, additive and emulsion chemistry claims are filed. E21B, earth and rock drilling, covers 42.1% of records and includes wellbore and drilling-process claims. Smaller clusters cover condensation polymers, hydrocarbon oil refining, separation processes, cement chemistry, magnetic/electrostatic separation and geophysical surveying, each under 6% of records, marking narrower but distinct filing activity.
The smaller IPC clusters — magnetic and electrostatic separation for solids control, geophysical surveying tied to mud properties, condensation-polymer base oil additives, and cement or ceramic weighting agents — each account for roughly 3 to 6% of the 720 records, well below the dominant C09K and E21B classes. These branches show patent activity exists but is comparatively thin, which is where a narrowly drafted claim is less likely to run into dense prior art from the leading filers.
The most-cited records in this dataset, including several from the early-to-mid 1990s and late 1990s on oil-based and ester-based invert emulsion muds, accumulated citations over long periods simply by being available longer. High citation counts are a useful signal of a patent's historical influence on the field's vocabulary and claim structure, but they should not be read as evidence that these are the most commercially active or current filings. Newer records have had far less time to accumulate citations regardless of their technical merit.
Answers are grounded in the same dataset. Derived from a Patsnap search on Invert Emulsion and Synthetic Drilling Fluids 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.