Zhang Xi is the legal representative of Xi Angwei Petroleum Instrument Co., Ltd., Xi Anhanmen Petroleum Engineering Co., Ltd. and Xi Anjuren Petroleum Technology Co., Ltd., a shareholder of Xi Angwei Petroleum Instrument Co., Ltd. and Xi Anjuren Petroleum Technology Co., Ltd., and an executive of Xi Angwei Petroleum Instrument Co., Ltd., Xi 'an Hanmen Petroleum Engineering Co., Ltd. and Xi 'an Giant Petroleum Technology Co., Ltd.
Xi Angwei Petroleum Instrument Co., Ltd. was established on June 23, 2007 with a registered capital of RMB 54,705,078. Its business scope covers general projects: technical service, technical development, technical consultation, technical exchange, technology transfer and technology popularization.