Assignee
CNPC ENG TECH RES & DEV CO LTD
CN·5 granted patents·0 citations·filing 2018–2021
Top patents by PatentIndex Score
5 records- 0150US11060009B2Filtrate reducer for temperature-resistant calcium-resistant water-based drilling fluid used in oil and gas reservoir protection, drilling fluid, and uses thereofCNPC ENG TECH RES & DEV CO LTD·Filed 2018·Granted Jul 13, 2021·0 cites·8 claims
- 0250US11053424B2Temperature-resistant calcium-resistant water-based drilling fluid for oil and gas reservoir protection and use thereofCNPC ENG TECH RES & DEV CO LTD·Filed 2018·Granted Jul 6, 2021·0 cites·10 claims
- 0350US10745605B2Plugging agent for temperature-resistant calcium-resistant water-based drilling fluid used in oil and gas reservoir protection, drilling fluid, and uses thereofCNPC ENG TECH RES & DEV CO LTD·Filed 2018·Granted Aug 18, 2020·0 cites·19 claims
- 0446US10858917B2Expandable liner hangerCNPC ENG TECH RES & DEV CO LTD·Filed 2019·Granted Dec 8, 2020·0 cites·13 claims
- 0530US11959375B2Method for evaluating downhole working condition of a PDC bitCNPC ENG TECH RES & DEV CO LTD·Filed 2021·Granted Apr 16, 2024·0 cites·6 claims
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