CNPC Drilling Research Institute
Patent Applications and Registrations
Patent applications and USPTO patent grants for CNPC Drilling Research Institute.The latest application filed is for "cementing plug".
- CNPC Drilling Research Institute - Beijing CN
| Patent | Date |
|---|---|
| Cementing Plug App 20180313186 - Zhang; Hongying ; et al. | 2018-11-01 |
| Mechanical And Hydraulic Dual-effect Expansion Device For Well Drilling With Expandable Tubular Technology App 20180202267 - XU; Binggui ; et al. | 2018-07-19 |
| Information transmission apparatus for logging while drilling Grant 9,816,327 - Liu , et al. November 14, 2 | 2017-11-14 |
| Casing Windowing Method And Tool Using Coiled Tubing App 20170152718 - ZHANG; Yanping ; et al. | 2017-06-01 |
| Information Transmission Apparatus For Logging While Drilling App 20150152726 - Liu; Guanghua ; et al. | 2015-06-04 |
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