Cementing plug
US-2018313186-A1 · Nov 1, 2018 · US
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China Nat Petroleum Corp patents in 2018
China Nat Petroleum Corp was listed as an assignee on 9 patent publications in 2018.
| Metric | Value |
|---|---|
| Company | China Nat Petroleum Corp |
| Year | 2018 |
| Patents | 9 |
Patents
Representative publications for China Nat Petroleum Corp in 2018.
Method and device for determining overall measurement of seismic observation system repeatability
US-2018231679-A1 · Aug 16, 2018 · US
Connection structure between pipe body and joint of aluminum alloy drill pipe
US-10036213-B2 · Jul 31, 2018 · US
Coupling apparatus for coiled tubings of different diameters, installing method for coupling apparatus, and installing method for tubings of different diameters using coupling apparatus
US-2018209572-A1 · Jul 26, 2018 · US
Mechanical and hydraulic dual-effect expansion device for well drilling with expandable tubular technology
US-2018202267-A1 · Jul 19, 2018 · US
Top CPC classifications
Most common classification codes for China Nat Petroleum Corp in 2018.
| CPC | Patents |
|---|---|
| E21B47/011 | 2 |
| G01V13/00 | 2 |
| G01V3/28 | 2 |
| G01V3/30 | 2 |
| B01J20/18 | 1 |
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