Assignee
CHINA NAT PETROLEUM CORP
CN·33 granted patents·19 pending applications·105 citations·filing 2001–2025
Top patents by PatentIndex Score
52 records- 0184US6607050B2Integrated ocean bottom towed array for four-component seismic data acquisitionCHINA NAT PETROLEUM CORP·Filed 2001·Granted Aug 19, 2003·94 cites·14 claims
- 0283US12326533B2Method and apparatus for removing tube wave interference from optical fiber acoustic wave sensing seismic dataCHINA NAT PETROLEUM CORP·Filed 2021·Granted Jun 10, 2025·1 cites·9 claims
- 0382US10450801B2Casing windowing method and tool using coiled tubingCHINA NAT PETROLEUM CORP·Filed 2016·Granted Oct 22, 2019·6 cites·20 claims
- 0470US12146095B2pH-responsive nano-gel plugging material, and preparation method therefor and use thereofCHINA NAT PETROLEUM CORP·Filed 2023·Granted Nov 19, 2024·0 cites·13 claims
- 0568US10641067B2Mechanical and hydraulic dual-effect expansion device for well drilling with expandable tubular technologyCHINA NAT PETROLEUM CORP·Filed 2016·Granted May 5, 2020·2 cites·10 claims
- 0665US12497331B2High-strength Portland cement slurry for ultra-high temperature cementing, preparation method therefor and application thereofCHINA NAT PETROLEUM CORP·Filed 2023·Granted Dec 16, 2025·0 cites·14 claims
- 0765US10228478B2Method of searching for oil-gas reservoir based on trap-3D softwareCHINA NAT PETROLEUM CORP·Filed 2015·Granted Mar 12, 2019·1 cites·8 claims
- 0861US2024360354A1Nanoemulsion and method for preparation thereof, and high-temperature-resistant, high-density, oil-based well completion fluid and application thereofCHINA NAT PETROLEUM CORP·Filed 2024·Application pending·0 cites
- 0959US12391861B2Cement slurry system, preparation method therefor and use thereofCHINA NAT PETROLEUM CORP·Filed 2022·Granted Aug 19, 2025·0 cites·13 claims
- 1059US9213124B2Restorable antennae apparatus and system for well loggingCHINA NAT PETROLEUM CORP·Filed 2013·Granted Dec 15, 2015·1 cites·23 claims
- 1156US12305116B2Ultra-high temperature resistant cement slurry system for cementing and preparation method and use thereofCHINA NAT PETROLEUM CORP·Filed 2022·Granted May 20, 2025·0 cites·19 claims
- 1255US2024377549A1Method and apparatus for inverting formation wave impedance using das borehole seismic dataCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 1355US2025306614A1Intelligent control method and apparatus for quick-open pressure-bearing device systemCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 1454US2025130341A1Method and apparatus for improving das signal-to-noise ratio by means of local fk transformCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 1554US2026050097A1Multi-wave and multi-domain adaptive seismic horizon auto-tracking method and apparatusCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 1653US12199448B2System and method for dynamically adjusting coupling coefficients of non-contact transmission magnetic mechanismCHINA NAT PETROLEUM CORP·Filed 2021·Granted Jan 14, 2025·0 cites·15 claims
- 1753US11880012B2Method and apparatus for extracting downgoing wavelet and attenuation parameters by using vertical seismic dataCHINA NAT PETROLEUM CORP·Filed 2021·Granted Jan 23, 2024·0 cites·9 claims
- 1853US2024228328A9Method and system for recycling heavy oil produced water for use in steam injection boiler without desilicationCHINA NAT PETROLEUM CORP·Filed 2023·Application pending·0 cites
- 1953US2024337525A1Method and System for Correcting Imbalance in In-phase/Quadrature Demodulation of Optical fiber DAS DataCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 2053US2024201415A1Method and device for calibrating depth of optical fibre in wellCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 2152US2025291080A1Velocity identification method and apparatus for interbed multiplesCHINA NAT PETROLEUM CORP·Filed 2023·Application pending·0 cites
- 2252US2024288348A1Set cement mechanical properties parameter measurement method and apparatus based on image recognition technologyCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 2351US2025164657A1Method and apparatus for determining velocity of subsurface medium, and deviceCHINA NAT PETROLEUM CORP·Filed 2025·Application pending·0 cites
- 2451US2024310191A1Method and Apparatus for Global Phase In-phase/Quadrature Demodulation of Optical fiber DAS dataCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 2550US9213125B2Well logging apparatus and systemCHINA NAT PETROLEUM CORP·Filed 2013·Granted Dec 15, 2015·0 cites·18 claims
- 2648US11994410B2Calibration and verification system and method for directional sensorCHINA NAT PETROLEUM CORP·Filed 2020·Granted May 28, 2024·0 cites·15 claims
- 2748US9382124B2Synthesis method for ETS-10 titanosilicate molecular sieveCHINA NAT PETROLEUM CORP·Filed 2012·Granted Jul 5, 2016·0 cites·21 claims
- 2847US11493595B2Method and apparatus for evaluating accuracy in positioning a receiver pointCHINA NAT PETROLEUM CORP·Filed 2018·Granted Nov 8, 2022·0 cites·12 claims
- 2947US2026078647A1Pressure-preserved coring tool, use method, and reservoir analysis methodCHINA NAT PETROLEUM CORP·Filed 2023·Application pending·0 cites
- 3047US2024204872A1Method and device for suppressing interference fading noise of optical fibre sensing dataCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 3146US2025035805A1Vsp-based depth domain seismic profile horizon calibration method and apparatusCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 3245US11618844B2High temperature resistant Portland cement slurry and production method thereofCHINA NAT PETROLEUM CORP·Filed 2019·Granted Apr 4, 2023·0 cites·5 claims
- 3344US2025027370A1Geosteering method and apparatus, and storage mediumCHINA NAT PETROLEUM CORP·Filed 2024·Application pending·0 cites
- 3443US11125898B2Method and system for positioning seismic source in microseism monitoringCHINA NAT PETROLEUM CORP·Filed 2019·Granted Sep 21, 2021·0 cites·18 claims
- 3542US11293254B2Expansion tool assembly for expandable tubularCHINA NAT PETROLEUM CORP·Filed 2020·Granted Apr 5, 2022·0 cites·11 claims
- 3641US12448885B2Mud pressure wave signal modulation apparatus and methodCHINA NAT PETROLEUM CORP·Filed 2022·Granted Oct 21, 2025·0 cites·17 claims
- 3740US2025067134A1Horizontal well cuttings bed processing method and deviceCHINA NAT PETROLEUM CORP·Filed 2022·Application pending·0 cites
- 3839US11982146B2Jet flow adjustment method for rotary steerable downhole releaseCHINA NAT PETROLEUM CORP·Filed 2021·Granted May 14, 2024·0 cites·12 claims
- 3939US10808496B2Cementing plugCHINA NAT PETROLEUM CORP·Filed 2018·Granted Oct 20, 2020·0 cites·13 claims
- 4039US10196863B2Connection structure between pipe body and steel joint of aluminum alloy drill pipeCHINA NAT PETROLEUM CORP·Filed 2015·Granted Feb 5, 2019·0 cites·12 claims
- 4138US10036213B2Connection structure between pipe body and joint of aluminum alloy drill pipeCHINA NAT PETROLEUM CORP·Filed 2015·Granted Jul 31, 2018·0 cites·7 claims
- 4238US2015168573A1Geologic quality factor inversion methodCHINA NAT PETROLEUM CORP·Filed 2012·Application pending·0 cites
- 4337US9816327B2Information transmission apparatus for logging while drillingCHINA NAT PETROLEUM CORP·Filed 2013·Granted Nov 14, 2017·0 cites·9 claims
- 4437US2011010098A1Method of pre-stack two-dimension-like transformation of three-dimensional seismic recordCHINA NAT PETROLEUM CORP·Filed 2009·Application pending·0 cites
- 4536US11946350B2Method for remotely shutting down downhole unit of rotary steering system from groundCHINA NAT PETROLEUM CORP·Filed 2021·Granted Apr 2, 2024·0 cites·14 claims
- 4635US10436920B2Monitoring system for use in seismic instrument arrangement in petroleum explorationCHINA NAT PETROLEUM CORP·Filed 2016·Granted Oct 8, 2019·0 cites·3 claims
- 4734US10005070B2Bimetallic mercaptan conversion catalyst for sweetening liquefied petroleum gas at low temperatureCHINA NAT PETROLEUM CORP·Filed 2016·Granted Jun 26, 2018·0 cites·10 claims
- 4833US11149496B2Coupling apparatus for coiled tubings of different diameters, installing method for coupling apparatus, and installing method for tubings of different diameters using coupling apparatusCHINA NAT PETROLEUM CORP·Filed 2018·Granted Oct 19, 2021·0 cites·6 claims
- 4933US10409251B2Automatic inspection and monitoring method based on time domain slotting controlCHINA NAT PETROLEUM CORP·Filed 2016·Granted Sep 10, 2019·0 cites·3 claims
- 5033US10184596B2Connection structure between pipe body and joint of aluminum alloy drill pipeCHINA NAT PETROLEUM CORP·Filed 2015·Granted Jan 22, 2019·0 cites·8 claims
Showing the top 50 of 52 patent records by PatentIndex Score.
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