E21B 47/18
Through the well fluid
Official title: through the well fluid {, e.g. mud pressure pulse telemetry}
E21B47/18 (Through the well fluid) appears on 1,212 US grants and 1,121 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,212
- Published applications
- 1,121
- Assignees
- 301
- Inventors
- 1,772
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 7 | 0 |
| 1981 | 6 | 0 |
| 1982 | 4 | 0 |
| 1983 | 7 | 0 |
| 1984 | 5 | 0 |
| 1985 | 15 | 0 |
| 1986 | 7 | 0 |
| 1987 | 15 | 0 |
| 1988 | 12 | 0 |
| 1989 | 12 | 0 |
| 1990 | 12 | 0 |
| 1991 | 11 | 0 |
| 1992 | 15 | 0 |
| 1993 | 11 | 0 |
| 1994 | 6 | 0 |
| 1995 | 9 | 0 |
| 1996 | 12 | 0 |
| 1997 | 7 | 0 |
| 1998 | 10 | 0 |
| 1999 | 9 | 0 |
| 2000 | 17 | 0 |
| 2001 | 14 | 1 |
| 2002 | 9 | 17 |
| 2003 | 8 | 13 |
| 2004 | 15 | 19 |
| 2005 | 11 | 20 |
| 2006 | 10 | 23 |
| 2007 | 15 | 26 |
| 2008 | 22 | 24 |
| 2009 | 16 | 19 |
| 2010 | 17 | 26 |
| 2011 | 13 | 19 |
| 2012 | 17 | 31 |
| 2013 | 22 | 42 |
| 2014 | 33 | 35 |
| 2015 | 25 | 64 |
| 2016 | 45 | 107 |
| 2017 | 81 | 111 |
| 2018 | 76 | 115 |
| 2019 | 125 | 96 |
| 2020 | 107 | 60 |
| 2021 | 59 | 60 |
| 2022 | 62 | 49 |
| 2023 | 59 | 47 |
| 2024 | 48 | 36 |
| 2025 | 41 | 30 |
| 2026 | 31 | 31 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Geologic velocity modeling framework6 Oct 2026US 12,754,338 B2Schlumberger Technology Corporation
- Interference compensated cross-axial magnetometer measurements22 Sep 2026US 12,742,380 B2Schlumberger Technology Corporation
- Hydrostatically balanced modulator assembly and associated method for mud pulse telemetry22 Sep 2026US 12,742,384 B1
- Calculating pull for a stuck drill string15 Sep 2026US 12,735,953 B2Landmark Graphics Corporation
- Wireless communication1 Sep 2026US 12,726,279 B2Tendeka B.V.
- Method and system for fast pulse telemetry with altered pulse coding8 Oct 2026US 2026/0309028 A1MS Directional, LLC
- Method for obtaining measurement and logging while drilling survey in adverse conditions24 Sep 2026US 2026/0286828 A1MS Directional, LLC
- Downhole positive displacement motor system17 Sep 2026US 2026/0275853 A1Schlumberger Technology Corporation
- Systems and methods for controlling a downhole tool in a downhole environment17 Sep 2026US 2026/0275855 A1Schlumberger Technology Corporation
- Video camera-based noise and signal separation for mud pulse telemetry10 Sep 2026US 2026/0266172 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Acoustic data link and formation property sensor for downhole MWD system315US 5,924,499 AHalliburton Energy Services.Inc. · 1999
- Short hop communication link for downhole MWD system294US 5,160,925 ADevelco, Inc. · 1992
- Drilling system utilizing downhole dysfunctions for determining corrective actions and simulating drilling conditions291US 6,021,377 ABaker Hughes Incorporated · 2000
- Closed loop drilling system229US 6,233,524 B1Baker Hughes Incorporated · 2001
- Method and apparatus for providing controlled force transference to a wellbore tool200US 5,343,963 A1994