Photo: Screenshot of Science and Technology Daily
China National Offshore Oil Corporation (CNOOC) Limited, the listed unit of China’s largest producer of offshore crude oil and pure fuel, mentioned that China’s first deep-water oilfield secondary growth undertaking—the Liuhua 11-1/4-1 Oilfield Secondary Development Project— has produced crude oil exceeding 700,000 tons after one 12 months’s operation, Science and Technology Daily reported on Saturday, citing the knowledge from the corporate.
This growth has surpassed expectations, displaying that CNOOC has efficiently overcome the world-class challenge of developing offshore reef limestone oilfields, the corporate mentioned.
Reef limestone oilfields are widely known as one of probably the most troublesome sorts of reservoirs to develop. Beneath such reservoirs, there typically exists a large “water cushion.” Once extraction begins, backside water quickly advances by means of the trail of least resistance—porous cavities—resulting in uncontrolled channeling and fast flooding of oil wells, leaving important quantities of crude oil unrecoverable.
After a decade of concentrated efforts, CNOOC has developed a sequence of applied sciences for controlling water and stabilizing manufacturing in offshore reef limestone reservoirs, considerably enhancing the recoverable reserves and restoration price of the Liuhua 11-1 oilfield, the CNOONC mentioned.
The Liuhua 11-1 oilfield is China’s first deep-water oilfield, changing into the nation’s largest offshore reef limestone oilfield in phrases of confirmed geological reserves so far.
Since its preliminary manufacturing in 1996, the oilfield has produced over 20 million tons of crude oil. However, the restoration issue stays at solely 12.84 p.c, with roughly 140 million tons of crude oil nonetheless trapped deep inside the submarine formation.
Global Times