胜利油田深薄层超稠油多元复合开采技术

Multi-combination exploiting technique of ultra-heavy oil reservoirs with deep and thin layers in Shengli Oilfield

胜利油田超稠油埋藏深、储集层薄、原油黏度大、胶质和沥青质含量高,采用目前成熟的稠油开发方式无法有效动用。结合超负压泡沫混排技术、高效油溶性降黏剂降黏技术、CO2非混相驱油技术和蒸汽吞吐技术,提出深薄层超稠油多元复合开采技术。针对多元复合开采技术的开采机理,进行相关实验:①测定泡沫黏度以及泡沫悬砂、冲砂性能;②油溶性复合降黏剂与常规降黏剂降黏效果对比实验和破乳实验;③CO2破乳能力实验。实验表明:泡沫具有良好的悬砂、冲砂性能;复合降黏剂的降黏效果远好于二甲苯,复合降黏剂和CO2均具有很好的破乳效果,原油乳化程度越高,破乳效果越好。现场试验显示多元复合开采技术开发深薄层超稠油具有良好效果。

There isn＇t any mature technique to develop ultra-heavy oil reservoirs in the Shengli Oilfield because of large oil viscosity,deep and thin layer,high rate of resin and asphaltene.The multi-combination exploiting technique is developed which combines the techniques of under-pressure foam flow-back,efficient oil-soluble dissolver,CO2 immiscible and steam huff and puff.The following experiments were conducted about the recovery mechanism of the technique：（1） measuring foam viscosity,sands suspension property and sands washing capacity;（2） comparing the capacities of viscosity breaking and emulsion breaking of oil-soluble dissolver with the conventional dissolver;（3） measuring emulsion breaking of CO2.The experimental results show： Foam has the advantages of greater viscosity,remarkable capacities of suspending and washing sands;the combination dissolver has greater advantage on viscosity breaking over xylene.The emulsion breaking capacity of the combination dissolver and CO2 is excellent,and the higher the W/O emulsion,the greater the capacity of emulsion breaking.Field tests show that the multi-combination exploiting technique is good in improving production of ultra-heavy oil reservoirs.