WS17-2油田注入水配伍性研究与防垢剂筛选

The Compatibility of Injected Water in WS 17-2 Oilfield and the Screening of Scale Inhibitor

注水开发目前是海上油田普遍采用的开发方式,注入水与地层水之间的配伍性直接影响注水和储层保护效果。在分析注入水和地层水成分基础上,采取结垢趋势预测和静态动态试验来评价海水和地层水之间的配伍性。结果表明,WS17-2油田流三段地层水和注入水离子含量相差较大,同时总矿化度均不高;海水自身以及和地层水之间在地层条件存在不配伍性现象,有碳酸钙垢生成,通过添加一定量的有机膦酸盐防垢剂可以有效阻止垢的生成。

At present,water flooding development is a widely used method in offshore oilfields,the compatibility between injected water and formation water directly influences the water injection and reservoir protection effect.Based on the analysis of the composition of injection water and formation water,the compatibility between sea water and formation water is evaluated by the prediction of scaling tendency and static and dynamic tests.The results show that ion content is agreat discrepancy between injection water and formation water,and the total salinity is not high.Under formation condition,the sea water itself and formation water are not compatible and calcium carbonate scale occurs,by adding a certain amount of organic phosphoric acid scale inhibitor,it can prevent scaling effectively.