| Utility: Method and device for determining elasticity of cement stone utilized in well cementing of oil-gas well Filling date: 8 Sep 2025 Issue date: 23 Feb 2021 | 31 Oct 2017 | 23 Feb 2021 |
| Utility: Method for in-depth profile control and displacement of low-permeability oil reservoirs Filling date: 8 Sep 2025 Issue date: 16 Feb 2021 | 18 Jan 2019 | 16 Feb 2021 |
| Utility: Method, apparatus, and system for eliminating frequency dispersion effect Filling date: 8 Sep 2025 Issue date: 16 Feb 2021 | 22 Aug 2018 | 16 Feb 2021 |
| Utility: Layered water injection system and layered water injection method Filling date: 8 Sep 2025 Issue date: 12 Jan 2021 | 30 Oct 2018 | 12 Jan 2021 |
| Utility: Downhole power generation device and separate-zone waterflooding device Filling date: 8 Sep 2025 Issue date: 12 Jan 2021 | 2 Aug 2018 | 12 Jan 2021 |
| Utility: Method and apparatus for measuring oil content of tight reservoir based on nuclear magnetic resonance Filling date: 8 Sep 2025 Issue date: 5 Jan 2021 | 11 Oct 2018 | 5 Jan 2021 |
| Utility: Chelating agent for reservoir acidification and stimulating injection and its preparation method and application Filling date: 8 Sep 2025 Issue date: 29 Dec 2020 | 23 Jan 2019 | 29 Dec 2020 |
| Utility: Method and apparatus for determining flow rates of components of multiphase fluid Filling date: 8 Sep 2025 Issue date: 15 Dec 2020 | 18 May 2018 | 15 Dec 2020 |
| Utility: Method and device of identifying fracture Filling date: 8 Sep 2025 Issue date: 24 Nov 2020 | 23 Jan 2018 | 24 Nov 2020 |
| Utility: Methods and devices for detecting mercury isotopes in crude oil Filling date: 8 Sep 2025 Issue date: 27 Oct 2020 | 19 Apr 2019 | 27 Oct 2020 |
| Utility: Spherical supported transition metal catalyst Filling date: 8 Sep 2025 Issue date: 20 Oct 2020 | 19 Feb 2016 | 20 Oct 2020 |
| Utility: Composition of nano-emulsion having small particle size and ultra-low concentration and a preparation method thereof Filling date: 8 Sep 2025 Issue date: 13 Oct 2020 | 13 Dec 2018 | 13 Oct 2020 |
| Utility: Rock mechanics experiment system for simulating deep-underground environment Filling date: 8 Sep 2025 Issue date: 13 Oct 2020 | 16 Jul 2018 | 13 Oct 2020 |
| Utility: Palladium-based supported hydrogenation catalyst, and preparation method and application thereof Filling date: 8 Sep 2025 Issue date: 13 Oct 2020 | 15 Jun 2018 | 13 Oct 2020 |
| Utility: Pressure-reducing and injection-enhancing anti scaling agent for low-permeability water-injection well and preparation method thereof Filling date: 8 Sep 2025 Issue date: 13 Oct 2020 | 29 Dec 2017 | 13 Oct 2020 |
| Utility: Acoustic emission sensor Filling date: 8 Sep 2025 Issue date: 6 Oct 2020 | 25 Jun 2018 | 6 Oct 2020 |
| Utility: Single-side modified .beta.-Anderson-type heteropolymolybdate organic derivatives Filling date: 8 Sep 2025 Issue date: 1 Sep 2020 | 15 May 2019 | 1 Sep 2020 |
| Utility: Amphiphilic molecular sieve containing hydrophilic group on the outside and lipophilic group on the inside and production method threof Filling date: 8 Sep 2025 Issue date: 1 Sep 2020 | 6 Jul 2018 | 1 Sep 2020 |
| Utility: Omnidirectional vector geophone Filling date: 8 Sep 2025 Issue date: 11 Aug 2020 | 27 Apr 2018 | 11 Aug 2020 |
| Utility: Exploitation method and exploitation well pattern for coalbed methane in low-permeability coalbed Filling date: 8 Sep 2025 Issue date: 4 Aug 2020 | 25 Feb 2019 | 4 Aug 2020 |
| Utility: Omnidirectional vector electrostatic levitation geophone Filling date: 8 Sep 2025 Issue date: 21 Jul 2020 | 27 Apr 2018 | 21 Jul 2020 |
| Utility: Methods for synthesizing mesoporous zeolite ETS-10 containing metal without a templating agent Filling date: 8 Sep 2025 Issue date: 14 Jul 2020 | 13 May 2019 | 14 Jul 2020 |
| Utility: Method and apparatus for processing seismic data Filling date: 8 Sep 2025 Issue date: 7 Jul 2020 | 29 Jan 2018 | 7 Jul 2020 |
| Utility: Nano-silica dispersion having amphiphilic properties and a double-particle structure and its production method Filling date: 8 Sep 2025 Issue date: 16 Jun 2020 | 30 Mar 2018 | 16 Jun 2020 |
| Utility: Liquid-phase hydroisomerization system and process therefor and use thereof Filling date: 8 Sep 2025 Issue date: 16 Jun 2020 | 8 Jun 2016 | 16 Jun 2020 |
| Utility: Amphiphilic molecular sieve containing lipophilic group on the outside and hydrophilic group on the inside and production method thereof Filling date: 8 Sep 2025 Issue date: 12 May 2020 | 6 Jul 2018 | 12 May 2020 |
| Utility: Method and device for determining karst development degree of reservoir, computer readable storage medium and device Filling date: 8 Sep 2025 Issue date: 5 May 2020 | 25 May 2018 | 5 May 2020 |
| Utility: Method and device for detecting damage rate of an inner coating of a downhole oil casing Filling date: 8 Sep 2025 Issue date: 5 May 2020 | 21 Mar 2018 | 5 May 2020 |
| Utility: Method for determining oil contents in rock formations Filling date: 8 Sep 2025 Issue date: 24 Mar 2020 | 31 Aug 2017 | 24 Mar 2020 |
| Utility: Omnidirectional vector seismic data processing method and apparatus, computer-readable storage medium and device Filling date: 8 Sep 2025 Issue date: 3 Mar 2020 | 27 Apr 2018 | 3 Mar 2020 |
| Utility: Surfactant that changes the wettability of tight sandstone and its preparation method and application Filling date: 8 Sep 2025 Issue date: 28 Jan 2020 | 18 Apr 2018 | 28 Jan 2020 |
| Utility: Method for determining maturity in oil source rock by total scanning fluorescence and the device therefor Filling date: 8 Sep 2025 Issue date: 14 Jan 2020 | 25 Oct 2018 | 14 Jan 2020 |
| Utility: Method and device for testing wettability of dense oil reservoir Filling date: 8 Sep 2025 Issue date: 24 Sep 2019 | 18 Apr 2017 | 24 Sep 2019 |
| Utility: Method and device for measuring formation elemental capture gamma ray spectra Filling date: 8 Sep 2025 Issue date: 3 Sep 2019 | 5 Feb 2018 | 3 Sep 2019 |
