南堡油田注水井结垢原因分析

Cause Analysis of Scale Formation in Water Injection Well of Nanpu Oilfield

采用stiff-davis方法预测碳酸钙结垢,通过结垢预测模型计算临界Ca2+浓度。根据南堡油田三相水出口离子含量,建立Ca2+含量变化曲线,与临界Ca2+含量相对比,分析结垢离子的来源。研究表明,该油田注水井结垢类型是碳酸钙垢,主要成垢离子是Ca2+,来源于高密度压井液。

This paper uses stiff- davis method to predict the CaCO3 scaling tendency and calculate critical calcium ion concentration,based on the scaling prediction model. According to years of data on three- phase water outlet ion content in Nanpu Oilfield,this paper first adopted linear regression method to set up the curves of the calcium ion content at different time,and then compared with the critical calcium content in order to find out the source of scaling ion. The research shows that the scaling type at Nanpu Oilfield is CaCO3,and the main scaling ion is calcium ion which comes from the high density well- killing fluid.