摘要
CaCO3 垢是油田注入水中主要的结垢类型 ,严重影响油田开发效果。通过 4种水样在不同温度下的结垢试验及岩心驱替试验 ,研究CaCO3 结垢机理并进行理论预测。结果表明 :①未处理油田注入水结垢严重 ,且结垢程度随温度上升而加剧 ,90℃时Ca2 + 、Mg2 + 下降率达 5 2 .3% ;②岩心驱替试验显示 ,CaCO3 晶体在岩石孔隙中和喉道表面均可析出 ;③处理后的水样位于CaCO3 溶解度的介稳区 ,水质稳定 ,不会产生CaCO3 垢 ;④理论预测与试验结果一致。表 4参 10 (尹先清摘 )
The CaCO_3 scaling is the main scaling type of oilfield injection waters, which seriously affects the oilfield development effectiveness. By means of scaling experiments and core flooding under the different temperatures for four types of water, scaling mechanism of CaCO_3 is studied and predicted theoretically. The results show that: (1) The scale is serious for oilfield injection water, which rises with the temperature but turns worse, when Ca 2+ and Mg 2+ descent rates amount to 52.3% at 90℃; (2) Core flooding experiments show that CaCO_3 crystal can precipate in core pores and at the surface of pore throat; (3) The treated water is in the steady area of CaCO_3 solubility, the water quality is stable, so this water can't produce the CaCO_3 scale and (4) Theoretical prediction is consistent with experiment result.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2002年第3期85-87,共3页
Petroleum Exploration and Development
关键词
油田
注入水
碳酸钙垢
结垢机理
预测
介稳区
scaling mechanism
prediction
region between steady and unsteady area
oilfield injection water
