Separation technique for oil-gas multi-phase flow transportation in submarine pipeline

Based on the special technique requirements for the oil-gas multi-phase flow transportation in submarine pipeline, some research work on oil-gas-water separation technique is introduced in this paper. It is applied at the Chun-Xiao oilfield, by dewatering from the oil and oil-gas multi-phase transportation, the blockage instances of the pipeline caused by the hydrate generated under the conditions of high pressure and low temperature in the long distance pipe transportation can be prevented. By summarizing the relational references, proceeding the patent retrieval and the domestic on-the-spot investigation, a combined separator based on the principal of gravity, centrifugation and expansion is proposed for the high efficiency and quick separation. Some theoretical and experimental research for the oil-water separation in the helical pipe which is not used yet is developed.