Offshore sea bed oil production comprises separation of water, gas and hydrocarbons which are difficult to exploit, sending only valuable light crude for onshore processing

摘要

Water (5), gas (6) and hydrocarbons exploited with difficulty (residues), are first separated on the sea (10) bed from the fluid (4) produced. The remaining, exploitable light crude (2L) is transported to the shore, for further processing. Preferred Features: From the recovered fluid, water, gas, asphaltene (9) and bituminous substances (9A) are separated on the sea bed. Water and these residues are re-injected back into the reservoir. Water is centrifuged- or cycloned-out from the recovered fluid. To separate the high-boiling residues, fluid temperature is reduced down to the point of their solidification, and they are removed. Following precipitation, the light crude and exploitable hydrocarbon compounds it contains, are sent onshore for further processing.