China Petroleum & Chemical Petroleum Engineering and Technical Services Co., Ltd. (formerly known as China Petroleum & Chemical Yizheng Chemical Fiber Co., Ltd.) is a Chinese company mainly engaged in integrated oil and gas engineering and technical services. The company operates through five business units, including geophysics, drilling engineering, logging, downhole special operations and engineering construction. Its business covers the whole industry chain process from exploration, drilling, completion, oil and gas production, oil and gas gathering and transportation to abandoned wells. The company operates in Chinese mainland, Hong Kong, Macao and Taiwan and overseas.