直罗葫芦河水与地层水配伍性实验研究

Experiment on the Compatibility of Hulu River Water and Formation Water in Zhiluo Area

油田注入水的配伍性对注水开发效果影响很大,为了搞清延安直罗葫芦河水作为直罗地区回注水的可行性,解决油田开发注水量大与陕北地区水资源匮乏的矛盾,进行了葫芦河水与直罗地区延安组和延长组地层水的水质分析,以及葫芦河水与各地层水的配伍性实验。水质分析结果表明,直罗葫芦河水矿化度小于600 mg/L,水型属于NaHCO_(3)型。地层水的矿化度普遍较高(均高于10000 mg/L),延安组和延长组水型为MgCl_(2)水型。配伍性实验表明,该地表水与延安组地层水配伍性较差,两种水样混合后出现浑浊现象,与延长组各地层水均具有较好的配伍性,根据实验,葫芦河水可作为直罗地区延长组地层的回注水。

The compatibility of injected water has a tremendous influence on water-flooding development results in an oil field.In order to conf irm the feasibility of water in Hulu river as reinjection water in Zhiluo area and resolve the contradiction between high water injection rate and water shortage in northern Shaanxi area,water quality analysis and compatibility experiments were conducted between the water in Hulu River and Yan’an&Yangchang formations respectively in Zhiluo area.The results of water quality analysis show that the water type is‘NaHCO_(3)’in Hulu river with salinity lower than 600 mg/L and formations are various with higher salinity(>10000 mg/L).The results of compatibility experiments demonstrate that the surface water has a poor compatibility with water in Yan’an formation showing a turbidity phenomenon when mixing the water samples,while it has a preferable compatibility with water in Yanchang formation.Based on the experiments,water in Hulu river can be used as the reinjection water of Yanchang formation in Zhiluo area.