Distributed Fibre Optic Sensing Patents: Leaders & Trends 2026
- 75.8% concentration. The top five assignees combined account for 244 of the 322 records in scope, a field held tightly by oilfield service majors rather than split among specialists.
- Filing has fallen sharply. From 16 filings in 2021 to 1 in 2024 — a 94% drop over that three-year span, on the last year that can be read as complete once publication lag is factored in.
- Optics is a minority class. G02B (optical elements and systems) appears in only 20.5% of records against E21B's 60.9%, showing that most claims are written from the drilling/wellbore side, not the photonics side.
Filing growth compares 2021 (16 records) with 2024 (1) — 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 322 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Distributed fibre optic sensing uses an optical fibre run into or alongside a wellbore as a continuous sensor, reading temperature, acoustic and strain signals along its length via backscatter techniques such as Rayleigh and Raman scattering. The 322 records in scope span fracture monitoring, cement evaluation, seismic sensing and flow diagnostics, most of them filed by companies that already supply downhole hardware rather than by photonics specialists entering the oilfield. The search string ties two vocabularies together — downhole optical fibre hardware, and the specific backscatter and interrogation methods that turn a length of glass into a distributed sensor — so the scope is narrower than “fibre optics in oil and gas” generally.
Coverage runs from 2015 through the 2026-07-31 cut-off. Because publication typically lags filing by around 18 months, the last one to two years of the trend will fill in further as more applications publish; the 2024 figures are the most recent that can be read as a stable base for growth comparisons.
Filing trends and technology composition
Two views of the same 322 records: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
A peak in 2019, then a steep decline
Filings rose from 27 in 2017 to a peak of 32 in 2019, then fell hard — 16 in 2021 down to 1 in 2024, a 94% drop over that span. Readers should treat 2025 and 2026 figures as incomplete rather than as evidence the decline is continuing, since publication lag means recent filings are still arriving in the dataset.
Drilling context dominates, optics is secondary
E21B (earth and rock drilling) appears in 60.9% of the 322 records, more than double the share for G01V (geophysics and surveying, 32.0%) and triple that of G02B (optical elements, 20.5%). Vibration sensing (G01H) and temperature measurement (G01K) each sit at 8.7%, with material analysis, transmission and welding/brazing classes trailing further behind. Since a record can carry several classes, these shares add to more than 100% of the 322-record total by design.
Shares are the percentage of the 322 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Distributed Fibre Optic Sensing in Wells with Eureka
This page is one run against one query. Ask Eureka your own question about distributed fibre optic sensing in wells and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this field
WO2016144646A1 — Downhole fiber optic sensors with downhole optical interrogator
An apparatus for sensing a parameter beneath a surface of the earth includes an optical fiber disposed beneath a surface of the earth and comprising at least one fiber Bragg grating sensor configured to sense the parameter and a wide-band light source disposed beneath the surface of the earth and configured to emit light in a wide band of wavelengths to illuminate the at least one fiber Bragg grating. An optical interrogator is disposed beneath the surface of the earth and configured to receive light reflected by the at least one fiber Bragg grating sensor and to transform a shift in wavelength of the reflected light into a variation of light intensity. A photo-sensor is configured to measurAbstract truncated as published.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20120257475A1 | Optical Fiber Based Downhole Seismic Sensor Systems and Methods | 152 |
| 2 | US20120111560A1 | Fracture Monitoring | 135 |
| 3 | US20120205103A1 | Cement Slurry Monitoring | 129 |
| 4 | US20120057432A1 | Well Monitoring by Means of Distributed Sensing Means | 102 |
| 5 | US20120046866A1 | Oilfield applications for distributed vibration sensing technology | 95 |
| 6 | US20070047867A1 | Downhole fiber optic acoustic sand detector | 82 |
| 7 | US20140180592A1 | Downhole Fluid Tracking With Distributed Acoustic Sensing | 80 |
| 8 | US20130233537A1 | Fracture Characterisation | 72 |
| 9 | WO2010136764A2 | Fracture monitoring | 70 |
| 10 | US9075155B2 | Optical fiber based downhole seismic sensor systems and methods | 66 |
Citation counts favour older filings that have had more time to accumulate citations inside the searched corpus — read them as a signal of technical influence, not of current filing activity.
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 filing strategy
Three patterns stand out once the ranking, the trend and the class breakdown are read together.
The field is a service-major stronghold
With 244 of 322 records held by five assignees, and 93.2% held by ten, new entrants are filing into claim space that a small number of established oilfield service companies have already mapped. A single-filer long tail exists below the top ten, but it holds a small residual share.
Filing has cooled from its 2019 peak
Volume peaked at 32 in 2019 and fell to 1 by 2024, a decline that predates any publication-lag effect since 2024 is treated as a complete year. That pattern is consistent with a technology whose foundational claims are largely staked out, pushing new activity toward narrower refinements.
Claims skew toward wellbore integration, not photonics
E21B appears in 60.9% of records versus 20.5% for G02B, so most patents describe how the fibre is deployed and used downhole rather than novel optical component design. That split points toward integration, packaging and interrogation-method claims as the more active zones.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to distributed fibre optic sensing in wells, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked leaders are dominated by oilfield service majors with established downhole hardware lines; smaller specialist filers and a long tail of single-record entrants fill out the remaining share.
A single filer well ahead of the field
The top-ranked assignee holds 90 records, roughly four times the fifth-place holder's 21, and recent-year momentum data shows this leader still filing (+100% YoY on a small recent-year base) while several other leading assignees show none in the latest year.
Most of the top ranks have gone quiet
Outside the leader, the other assignees among the top ranked names show zero filings in the latest year on record. That is consistent with the broader -94% decline from 2021 to 2024 rather than a company-specific pullback.
Co-filing is limited and concentrated
Only 10 co-assignee pairs appear across the dataset, with the strongest pairing appearing 8 times. Collaboration is not how most of this field's IP has been built — filings are predominantly single-assignee.
| Assignee | Recent year | YoY |
|---|---|---|
| Halliburton Energy Services, Inc. | 2 | +100% |
| Baker Hughes Holdings LLC | 0 | — |
| OptaSense Holdings Limited | 0 | — |
| Weatherford Technology Holdings, LLC | 0 | — |
| QinetiQ Limited | 0 | — |
| Baker Hughes Oilfield Operations LLC | 0 | — |
| AFL Telecommunications LLC | 0 | — |
| Silixa Ltd. | 0 | — |
Where to take this analysis
The dataset points to a mature, concentrated field with a cooling filing rate — the open questions are about where narrower claim space still exists.
Map the white space claim by claim
Under-claimed branches such as interrogation methods and signal processing sit inside a field otherwise dominated by drilling-context claims. A claim-level review of these branches against the leader's existing family would show what is actually still open.
Explore white space in EurekaWatch the leader's next filings
One assignee is still filing while most of the ranked leaders show no latest-year activity. Tracking that single filer's continuations and new applications is the most direct signal of where the field moves next.
Track assignee activity in EurekaRevisit citation leaders for design-around risk
The most-cited records in this field date from the early 2010s and still anchor much of the surrounding claim language. Any new filing in fracture monitoring, cement evaluation or distributed vibration sensing should be checked against them first.
Review cited records in EurekaCommon questions about this landscape
Filing in this field is concentrated among a small number of oilfield service majors, with the top five assignees together accounting for 75.8% of the 322 records in scope. The single leading assignee holds 90 records, well ahead of the fifth-ranked holder at 21. Below the top ten, which together hold 93.2% of records, a long tail of smaller filers each contribute a handful of records or fewer, so the practical competitive set for freedom-to-operate checks is small.
No — filing volume peaked at 32 records in 2019 and has fallen sharply since, down to 1 record in 2024, a 94% decline from the 16 filed in 2021. That 2024 figure is the most recent year that can be treated as a complete data point, since publication typically lags filing by around 18 months and 2025-2026 counts will still rise as pending applications publish. The pattern points to a field where foundational claim space is largely staked out rather than one still in early growth.
The search combines downhole optical fibre hardware terms with backscatter and interrogation method terms, so it captures patents describing both the physical fibre deployment and the sensing technique used to read it. By IPC class, 60.9% of the 322 records sit in E21B (earth and rock drilling), 32.0% in G01V (geophysics and surveying) and 20.5% in G02B (optical elements and systems), with smaller shares in vibration sensing, temperature measurement, material analysis and transmission classes. Because records can carry multiple classes, these figures overlap rather than sum to 100%.
The class composition suggests thinner coverage in branches such as fibre Bragg grating interrogation methods, hydrogen-darkening mitigation, and multi-parameter Raman/Rayleigh co-interrogation, since these sit well below the dominant drilling-context claims. Welding and brazing of downhole optical connectors — a packaging and reliability concern — also shows a comparatively small record count. Any of these would need a claim-level check against the leading assignee's existing family before relying on them as open ground.
WO2016144646A1, assigned to Baker Hughes, describes a downhole apparatus combining a fiber Bragg grating sensor, a wide-band light source and an optical interrogator, all located beneath the surface, that converts a wavelength shift in reflected light into a measurable variation in light intensity. That places the interrogation electronics downhole rather than at surface, which is the specific design choice at the core of the claim. Anyone designing a downhole interrogation scheme should check their architecture against this filing and its family before finalising a design.
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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.
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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.