E21B 49/087
Well testing
Official title: {Well testing, e.g. testing for reservoir productivity or formation parameters}
E21B49/087 (Well testing) appears on 1,455 US grants and 1,581 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,455
- Published applications
- 1,581
- Assignees
- 312
- Inventors
- 2,927
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 11 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 7 | 0 |
| 1982 | 4 | 0 |
| 1983 | 7 | 0 |
| 1984 | 17 | 0 |
| 1985 | 8 | 0 |
| 1986 | 8 | 0 |
| 1987 | 8 | 0 |
| 1988 | 6 | 0 |
| 1989 | 9 | 0 |
| 1990 | 5 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 0 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 1 |
| 2002 | 14 | 12 |
| 2003 | 8 | 12 |
| 2004 | 9 | 24 |
| 2005 | 7 | 14 |
| 2006 | 16 | 8 |
| 2007 | 16 | 12 |
| 2008 | 7 | 16 |
| 2009 | 9 | 17 |
| 2010 | 6 | 19 |
| 2011 | 6 | 30 |
| 2012 | 16 | 28 |
| 2013 | 17 | 44 |
| 2014 | 30 | 48 |
| 2015 | 28 | 84 |
| 2016 | 53 | 97 |
| 2017 | 69 | 98 |
| 2018 | 58 | 115 |
| 2019 | 109 | 107 |
| 2020 | 123 | 121 |
| 2021 | 112 | 166 |
| 2022 | 146 | 127 |
| 2023 | 159 | 116 |
| 2024 | 121 | 122 |
| 2025 | 98 | 86 |
| 2026 | 67 | 57 |
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
- Validation for reservoir flow during formation testing22 Sep 2026US 12,742,387 B2Halliburton Energy Services.Inc.
- Methods and systems for determining well shut-in pressures of oil and gas well drilling15 Sep 2026US 12,735,982 B2Southwest Petroleum University
- Flowback monitoring system and methods15 Sep 2026US 12,735,983 B2Ideal Completion Services LLC
- Determination of downhole formation fluid contamination and certain component concentrations15 Sep 2026US 12,735,984 B2Halliburton 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.
- System and method for optimized production of hydrocarbons from shale oil reservoirs via cyclic injection24 Sep 2026US 2026/0286213 A1Shale Ingenuity, LLC
- Real time downhole api determination24 Sep 2026US 2026/0286843 A1Schlumberger Technology Corporation
- Mobile offshore production and processing unit utilizing produced natural gas generating power, hydrogen, carbon, and/or hydrocarbon liquids3 Sep 2026US 2026/0258312 A1Modular MOPU, LLC
Most cited
By later US patents
- 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
- Apparatus and method for analyzing the composition of formation fluids242US 4,994,671 ASchlumberger Technology Corporation · 1991
- Systems and methods for exchanging fracturing components of a hydraulic fracturing unit180US 10,954,770 B1BJ Energy Solutions, LLC · 2021
- Formation isolation and testing apparatus and method172US 5,803,186 ABaker Hughes Incorporated · 1998