Wellbore Strengthening Patents: Top Companies & Trends 2026
- Five filers hold 83.7% of the field. 499 of 596 records in scope sit with the top five assignees — a narrow set of oilfield service majors, not a fragmented market.
- Filing grew 400% from 2021 to 2024. Annual filings rose from 1 to 5 over that span, the last three-year window unaffected by publication lag.
- Materials science outweighs mechanical claims. C09K (materials for misc. applications) appears in 53.5% of records, nearly matching E21B drilling claims at 67.1% — bridging and loss-control chemistry, not tool geometry, is where claim density concentrates.
Filing growth compares 2021 (1 records) with 2024 (5) — 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 596 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Wellbore strengthening and depleted-zone drilling cover the methods used to raise a formation’s fracture gradient and manage a narrow mud weight window when drilling through weak or depleted sands. The search spans 596 published records from 2015 through the 2026-07-31 cut-off, built around stress-cage mechanisms, particle bridging design, lost circulation materials and the operational problem of differential sticking.
Records are drawn from filings across six receiving offices, led by the United States, WIPO's PCT route, the United Kingdom, Canada, Australia and the EPO — a spread consistent with a field driven by multinational oilfield service companies filing in the jurisdictions where drilling activity and litigation risk are highest.
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Filing trend and technology composition
Two views of the same 596 records: how filing activity has moved year over year, and which IPC subclasses carry the claims.
Filing trend
Filings peaked at 27 in 2017 and have since run at a lower, steadier pace. The 2021-to-2024 window shows genuine growth — from 1 to 5 filings, a 400% rise — but 2025 and 2026 figures are still filling in under the usual 18-month publication lag and should not be read as a slowdown.
IPC composition
E21B (earth and rock drilling) appears in 67.1% of the 596 records, and C09K (materials for miscellaneous applications) in 53.5% — the two together indicate that most inventive activity sits at the intersection of drilling-fluid chemistry and downhole mechanics. Smaller shares in B07B, G01N and G06N point to solids-control, testing and early-stage digital/AI applications as secondary but present threads.
Shares are the percentage of the 596 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Wellbore Strengthening and Depleted Zone Drilling with Eureka
This page is one run against one query. Ask Eureka your own question about wellbore strengthening and depleted zone drilling and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
CA2973154C — Visualized and pressure-bearing evaluation device for WSM and LCM
The device under CA2973154C evaluates wellbore strengthening material and lost circulation material behaviour under pressure using a transparent observation tube, piston cylinder and torque rod assembly, letting an operator visually track fluid and particle-bridging performance rather than infer it from downhole data alone.Filed by Vertechs Oil & Gas Technology Co., Ltd., published 2018-10-16.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20090029878A1 | Drilling fluid, drill-in fluid, completition fluid, and workover fluid additive compositions containing therm… | 126 |
| 2 | US20100230169A1 | Compositions and methods for inhibiting lost circulation during well operations | 105 |
| 3 | US20100230164A1 | Compositions and methods for inhibiting lost circulation during well operation | 92 |
| 4 | US20100270216A1 | Shale shaker | 76 |
| 5 | WO2014008598A1 | Drilling fluids with NANO and granular particles and their use for wellbore strengthening | 75 |
| 6 | US20100263867A1 | Utilizing electromagnetic radiation to activate filtercake breakers downhole | 73 |
| 7 | US20090272580A1 | Drilling system with drill string valves | 66 |
| 8 | US20180037803A1 | Methods of treating oil and gas well fractures | 65 |
| 9 | US8887808B2 | Engineered methods and materials for wellbore strengthening in subterranean operations | 57 |
| 10 | US9416306B2 | Clean fluid loss control additives | 48 |
Citation counts favour older filings that have had more time to accumulate references; treat them as a signal 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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Browse MCP servers →What the numbers signal
Three patterns stand out once the record set is broken down by concentration, technology class and timing.
The field is a five-player game
With 499 of 596 records concentrated in five assignees, and 553 (92.8%) in the top ten, this is not a landscape where a new entrant files around a crowded middle tier — the crowding is at the very top.
Chemistry claims rival mechanical claims
E21B drilling claims lead but C09K materials claims are close behind, meaning particle bridging formulations and lost-circulation additive chemistry are claimed almost as densely as the drilling hardware itself.
Recent growth is real but small in absolute terms
The rise from 1 to 5 annual filings between 2021 and 2024 is a genuine growth signal within a field whose overall peak year (27, in 2017) has not been approached again.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to wellbore strengthening and depleted zone drilling, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Schlumberger Technology B.V. | Schlumberger Technology Corporation | 9 |
| Schlumberger Technology B.V. | Schlumberger Holdings Limited | 7 |
| Schlumberger Technology Corporation | Schlumberger Holdings Limited | 7 |
| Schlumberger Technology B.V. | Prad Research and Development Limited | 5 |
| Schlumberger Technology B.V. | Schlumberger Canada Limited | 5 |
| Schlumberger Technology Corporation | Prad Research and Development Limited | 5 |
| Schlumberger Technology Corporation | Schlumberger Canada Limited | 5 |
| National Oilwell Varco, L.P. | BURNETT GEORGE ALEXANDER | 4 |
All 10 identified co-assignee pairs involve related Schlumberger entities, suggesting the co-filing signal in this dataset reflects corporate group structure rather than cross-company collaboration.
Who holds the ground, and where it is open
The ranked leaders here cover 60 companies, but the distribution is steep: a handful of oilfield service majors account for nearly all of the top-10 share, and momentum among the largest holders has flattened in the latest year.
One filer dominates the count
The leading assignee's 376 records dwarf the fifth-place holder's 13, a gap that says more about decades of continuation filing in core drilling-fluid chemistry than about recent activity.
A long tail past the top ten
Beyond the top ten holders, who already account for 92.8% of records, the remaining ranked companies each hold small, likely niche or regional positions.
Leaders have gone quiet in the latest year
Every one of the largest holders shows zero filings in the most recent year tracked — consistent with publication lag rather than an actual stop, since 2025-2026 data is still incomplete.
| Assignee | Recent year | YoY |
|---|---|---|
| Halliburton Energy Services, Inc. | 0 | — |
| M-I LLC | 0 | — |
| National Oilwell Varco, L.P. | 0 | — |
| Weatherford Technology Holdings, LLC | 0 | — |
| TotalEnergies SE | 0 | — |
| Euro Mud Company AS | 0 | — |
| NFLUIDS | 0 | — |
| Schlumberger Technology B.V. | 0 | -100% |
Where to take this next
The record set points to a narrow set of decisions: where filing further in core drilling-fluid chemistry is likely to run into dense prior art, and where the thinner classes still leave room to build a defensible position.
Map claim scope before filing in C09K or E21B
With two-thirds to half of all records touching these classes, a freedom-to-operate check against the leading assignees' portfolios is worth doing before drafting new bridging or fluid-loss claims.
Explore claim scope in Eureka →Track the thinner classes for early positioning
G06N and G06F together sit under 2% of records each — AI-assisted mud weight window and hoop stress prediction tools are still lightly claimed relative to the mechanical and chemical core.
Run a white space search in Eureka →Common questions on this landscape
Wellbore strengthening refers to methods that raise a formation's effective fracture gradient so drillers can use a heavier mud weight without inducing losses, typically by bridging or sealing near-wellbore fractures with engineered particles. In this dataset it is claimed alongside stress-cage mechanisms and hoop-stress-increase methods, and overlaps heavily with lost circulation material design. The two problems are usually addressed in the same patent family because both rely on particle bridging design at the wellbore wall.
The field is highly concentrated: five assignees hold 499 of the 596 records in scope, or 83.7%, and ten assignees hold 92.8%. The leading assignee alone holds 376 records, far ahead of the fifth-place holder's 13. This is a landscape shaped by a small number of large oilfield service companies rather than a fragmented set of independent inventors.
Filings peaked at 27 in 2017 and have not returned to that level since, but the most recent complete years show real growth — from 1 filing in 2021 to 5 in 2024, a 400% increase. Data for 2025 and 2026 is still incomplete because publication typically lags actual filing by around 18 months, so those years should not be read as a decline. The honest read is a lower, steadier filing rate than the mid-2010s peak, with a modest recent uptick.
Two mechanical and chemical classes, E21B and C09K, dominate at 67.1% and 53.5% of records respectively, leaving smaller classes comparatively open. G06N (AI-based computing) and G06F (digital data processing) each sit at 1.8% or below, suggesting predictive tools for mud weight window management and automated bridging-material dosing are thinner areas relative to the mechanical and chemical core. These lighter classes are worth checking before assuming any adjacent idea is already blocked.
CA2973154C claims a visualized, pressure-bearing evaluation device for testing wellbore strengthening material and lost circulation material performance, built around a transparent observation tube, piston cylinder and torque rod. It is a testing and evaluation apparatus rather than a downhole strengthening method, so it constrains device-level test rig designs more than it constrains the strengthening materials or methods themselves. Anyone building a similar visual pressure-testing rig for LCM or WSM behaviour should review its specific claim elements before designing a comparable apparatus.
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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.