GENEVA, July 9 -- PETROCHINA COMPANY LIMITED filed a patent application (CN2025/131329) for “MULTIFUNCTIONAL DOWNHOLE FLOW CIRCULATION REGULATION DEVICE AND REGULATION METHOD”. With publication no. WO/2026/144493, here are the other details related to the patent application:
Kind: Initial Publication with ISR [A1]
IPC: E21B 21/08
Notably, the patent application was submitted under the International Patent Classification (IPC) system, which is managed by the World Intellectual Property Organization (WIPO).
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