Under the guidance of concept of integrated services, COSL has formed the service network of R&D, design, manufacture, sales and marketing. COSL provides customized screens, upper and lower completion tools which can meet the requirement of all kinds of upper artificial lifting, lower gravel pack and stand-alone design. The numerically controlled manufacturing facilities available with highly trained machinists who take pride in producing qualified products guarantees the perfection of the products. For technical services, COSL has mature well completion sand-control experimental ability and on-site operational personnel to conduct formation sand fineness testing, sand-control test evaluation to ensure the multiple operations simultaneously. COSL established a comprehensive QHSE management system which meets the requirement of ISO9001 and API Q1 certification and petroleum industry safety production standard well completion operation implementation specifications. COSL also obtained the API Spec Q1 and ISO 9001 quality management system certifications as well as API -11D1、API-5CT、API-14A、API-14L product certifications to guarantee the safe, high-quality, efficient services for our clients.