E21B 49/08
Obtaining fluid samples or testing fluids, in boreholes or wells
E21B49/08 (Obtaining fluid samples or testing fluids, in boreholes or wells) appears on 3,295 US grants and 3,285 published applications in this corpus.
Search patents in E21B- Granted patents
- 3,295
- Published applications
- 3,285
- Assignees
- 623
- Inventors
- 5,236
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 16 | 0 |
| 1978 | 6 | 0 |
| 1979 | 4 | 0 |
| 1980 | 8 | 0 |
| 1981 | 17 | 0 |
| 1982 | 10 | 0 |
| 1983 | 18 | 0 |
| 1984 | 30 | 0 |
| 1985 | 19 | 0 |
| 1986 | 19 | 0 |
| 1987 | 20 | 0 |
| 1988 | 24 | 0 |
| 1989 | 29 | 0 |
| 1990 | 15 | 0 |
| 1991 | 24 | 0 |
| 1992 | 23 | 0 |
| 1993 | 26 | 0 |
| 1994 | 36 | 0 |
| 1995 | 15 | 0 |
| 1996 | 21 | 0 |
| 1997 | 21 | 0 |
| 1998 | 25 | 0 |
| 1999 | 31 | 0 |
| 2000 | 31 | 0 |
| 2001 | 39 | 6 |
| 2002 | 42 | 47 |
| 2003 | 35 | 44 |
| 2004 | 39 | 78 |
| 2005 | 38 | 58 |
| 2006 | 56 | 43 |
| 2007 | 61 | 58 |
| 2008 | 41 | 70 |
| 2009 | 45 | 92 |
| 2010 | 63 | 92 |
| 2011 | 59 | 93 |
| 2012 | 67 | 89 |
| 2013 | 76 | 126 |
| 2014 | 92 | 152 |
| 2015 | 103 | 187 |
| 2016 | 118 | 208 |
| 2017 | 162 | 229 |
| 2018 | 142 | 233 |
| 2019 | 240 | 191 |
| 2020 | 224 | 194 |
| 2021 | 202 | 224 |
| 2022 | 209 | 188 |
| 2023 | 218 | 164 |
| 2024 | 170 | 176 |
| 2025 | 146 | 151 |
| 2026 | 106 | 92 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Subsurface detection system and method6 Oct 2026US 12,753,692 B2Schlumberger Technology Corporation
- Method and apparatus for downhole fluid microsample collection with staged hydraulic actuation22 Sep 2026US 12,742,386 B2Halliburton Energy Services.Inc.
- Validation for reservoir flow during formation testing22 Sep 2026US 12,742,387 B2Halliburton Energy Services.Inc.
- Calculating pull for a stuck drill string15 Sep 2026US 12,735,953 B2Landmark Graphics Corporation
- Methods and systems for determining well shut-in pressures of oil and gas well drilling15 Sep 2026US 12,735,982 B2Southwest Petroleum University
- Downhole sensing based on time domain reflectometry using resistance and capacitance coupling8 Oct 2026US 2026/0309026 A1Halliburton Energy Services.Inc.
- Method for measuring downhole holdup, and method for determining downhole fluid interface and geometric distribution8 Oct 2026US 2026/0309606 A1China University of Petroleum (East China)
- Systems and methods for discovering and recovering subsurface fluids and verification of subsurface storage fluids1 Oct 2026US 2026/0298082 A1Koloma, Inc.
- Systems and methods for downhole lithium sensing1 Oct 2026US 2026/0299160 A1Saudi Arabian Oil Company
- System and method for optimized production of hydrocarbons from shale oil reservoirs via cyclic injection24 Sep 2026US 2026/0286213 A1Shale Ingenuity, LLC
Most cited
By later US patents
- Method and apparatus for testing, completion and/or maintaining wellbores using a sensor device420US 5,829,520 ABaker Hughes Incorporated · 1998
- Down hole tool for determination of formation properties330US 4,860,581 ASchlumberger Technology Corporation · 1989
- Down hole method for determination of formation properties276US 4,936,139 ASchlumberger Technology Corporation · 1990
- Monitoring of downhole parameters and tools utilizing fiber optics244US 6,281,489 B1Baker Hughes Incorporated · 2001
- Apparatus and method for analyzing the composition of formation fluids242US 4,994,671 ASchlumberger Technology Corporation · 1991