Drilling fluid rheology and hydraulics patents: who holds the ground and what is still open
63.7% concentration. The top 5 assignees hold 1,206 of the 1,892 records in scope — filing here is dominated by a small group of oilfield services majors, not a fragmented field. Annual publications rose to a peak of 83 in 2020, then declined; the last complete comparison shows 2021 at 64 falling to 2024 at 20, a 69% drop over that three-year span. 2025 and 2026 counts will rise as the publication backlog clears, so treat the tail of the chart as incomplete rather than as evidence of a further slide.
- 1HALLIBURTON ENERGY SERVICES INC719
- 2M I LLC(US)189
- 3SAUDI ARABIAN OIL CO150
- 4WEATHERFORD TECHNOLOGY HOLDINGS LLC85
- 5ELEMENTIS SPECIALTIES INC63
See the full drilling fluid rheology and hydraulics analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about this landscape
Who holds the most patents in drilling fluid rheology and hydraulics?
Filing in this field is concentrated: the leading assignee alone accounts for 719 of the 1,892 records in scope, and the top five assignees combined hold 1,206 records, or 63.7% of the total. The next tier drops off sharply, with the tenth-ranked assignee holding only 29 records. This pattern is typical of a field anchored by a small number of large oilfield services and national oil companies rather than spread across many independent filers.
Is patent filing in drilling fluid rheology increasing or decreasing?
Filings peaked in 2020 at 83 published records and have declined since; comparing the last two fully comparable years, 2021 (64) to 2024 (20) shows a 69% drop. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so the most recent one to two years will rise as more records publish and should not yet be read as a continuing decline.
What is equivalent circulating density and why does it matter for patents in this space?
Equivalent circulating density (ECD) is the effective density of drilling fluid in the wellbore annulus while circulating, accounting for friction and cuttings load, and it is one of the two search terms anchoring this dataset alongside annular pressure loss. It matters for IP because ECD calculation methods, especially real-time versions that feed back into drilling control, form one of the more heavily cited claim areas in this corpus, including the most-cited record in the set.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Drilling Fluid Rheology and Hydraulics covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.