油田注水结垢规律及化学防治措施研究
Study on the regularity of scale formation and chemical control measures of oil field waterflood
马向 1周正鹏 1李邓 1马亮 1王铁军1
作者信息
- 1. 中石油 长庆油田分公司 第三采油厂,陕西 延安 717600
- 折叠
摘要
鄂尔多斯盆地X区块多层系同时开发,不同层位采出水未做分离,混合后用于回注作业造成注入压力升高.本文通过静态模拟实验测试分析了X区块已开发的S、M、Z 3 个层位采出水及其混合水的结垢规律,并通过测试透光率、岩芯伤害率分析了各层采出水配伍性,最后对 5 种类型化学除垢剂进行评价优选实验.研究表明,X区块S、Z层采出水为CaCl2 水型,M层采出水为Na2SO4 水型,相同水型任意比混配在 40～90℃内结垢量甚微,且配伍性良好;S层/M层、M层/Z层产出水混合后结垢量较大,配伍性差,分别在 1∶1 与 3∶1的质量比条件下出现最大结垢量以及对岩芯的最大伤害率;有机复合膦酸防垢剂相对于磷酸盐、磷酸酯以及羧酸类防垢剂体现出最佳防垢效果与最低用量,防垢剂临界浓度为 10～15 mg·L-1,防垢率达到95.8%.
Abstract
The multi-layer system in Block X of Ordos Basin was developed at the same time,and the produced water in different layers was not separated and mixed for reinjection operation,resulting in the injection pressure rising.In this paper,the scale formation rules of the produced water and its mixed water developed at S,M and Z layers in Block X were analyzed through static simulation experiments,and the compatibility of produced water at each layer was analyzed by testing light transmission and core damage rate.Finally,the evaluation and optimization experiments of five types of chemical scale removal agents were carried out.The results show that the produced water in the S and Z layers of Block X is CaCl2 water type,and the produced water in the M layer is Na2SO4 water type.The scale formation amount of the same water type is very small at 40～90℃,and the compatibility is good.After mixing the produced water of S-layer/M-layer and M-layer/Z-layer,the scale amount is large and the compatibility is poor,and the maximum scale amount and the maximum damage rate to the core appear under the mass ratio of 1∶1 and 3∶1 respectively.Compared with phosphate,phosphate ester and carboxylic acid,the organic compound phosphonic acid anti-scale agent showed the best anti-scale effect and the lowest dosage.The critical concentration of anti-scale agent was 10～15mg·L-1,and the anti-scale rate reached 95.8%.
关键词
混合采出水/地层结垢/防垢剂优选/结垢规律/化学防治Key words
mixed produced water/formation scaling/optimization of anti-scale agent/scaling rule/chemical prevention引用本文复制引用
基金项目
中国石油科研项目(CQ2022ZCCCF2321)
出版年
2024
NETL
NSTL
万方数据