Expansion tool assembly for expandable tubular
US-2021396092-A1 · Dec 23, 2021 · US
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China Nat Petroleum Corp patents in 2021
China Nat Petroleum Corp was listed as an assignee on 4 patent publications in 2021.
| Metric | Value |
|---|---|
| Company | China Nat Petroleum Corp |
| Year | 2021 |
| Patents | 4 |
Patents
Representative publications for China Nat Petroleum Corp in 2021.
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-11149496-B2 · Oct 19, 2021 · US
Method and system for positioning seismic source in microseism monitoring
US-11125898-B2 · Sep 21, 2021 · US
Polycrystalline diamond cutter with improved geometry for cooling and cutting evacuation and efficiency and durability
US-10907416-B2 · Feb 2, 2021 · US
Top CPC classifications
Most common classification codes for China Nat Petroleum Corp in 2021.
| CPC | Patents |
|---|---|
| E21B1/00 | 1 |
| E21B10/42 | 1 |
| E21B10/5673 | 1 |
| E21B17/02 | 1 |
| E21B17/04 | 1 |
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