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Petro-king Oilfield Services Limited, an investment holding company, provides oilfield technology services in the People's Republic of China, the Middle East, and internationally. It operates through Oilfield Project Tools and Services, Consultancy Services, and Others segments. The company offers oilfield project tools and services, such as oilfield development plan, procurement advice, tools and equipment installation, and on-site project management services, as well as assembles and sells oilfield project tools.