Shengli Oilfield Tongtai International Trading (Tongtai), It covers an area of 67,000 square meters, with three workshops and one office building in the high tech park of Dongying Economic Development Zone, with a total investment over 16 million yuan. As one of the wholly-owned subsidiary company of Sinopec Shengli Oilfield Co., Ltd, management of Tongtai have rich experience in oil exploration, oil recovery and field service and also have kept sound relationship with all enterprises of Shengli oilfield. Tongtai began to extend business scope into its know-how areas, namely all kinds of oilfield services such as drilling, cementing, repairing and downhole services in the beginning of 2004. It also tried to import oilfield equipment for other subsidiary companies of Shengli Oilfield in the same yea and reached fruitful achievement.