七月丁香五月婷婷首页,99精品久久久久久久久久综合,日本阿v手机不卡在线观看视频,色情www欧美影院

Deshi has been committed to the research and development of heavy oil recovery systems, and has evaluated the high-temperature and oil recovery performance of more than 1000 chemical additives. Indoor and field experiments have been conducted, and a heavy oil recovery technology using composite chemical agents, nitrogen, and assisted steam injection has been developed. This technology is a national patent technology independently developed by Deshi.