Sinopec Shengli Petroleum Engineering Co., Ltd.’S 2026 Centralized Bidding For Chemicals For Drilling Fluids (Open, Domestic Exploration Areas)/Sulfomethyl Phenolic Resin/21557T B1 Phenolic Resins\Sulfomethyl Phenolic Resin Type Iii Q/Sy Tz 0335 Prequalification Announcement