长庆油田地层硫酸盐结垢预测模拟

PREDICTION AND SIMULATION ON SCALING TENDENCY OF SULFATE IN FORMATIONS IN CHANGQING OILFIELD

长庆油田主要开采层系中生界侏罗系延９、延１０油层组，地层水中普遍含有钡、锶、钙离子，而且含量很高，作为该区注入水的洛河水含较高的硫酸根离子，引起硫酸盐垢沉淀。文中着重研究油田作业过程中ＢａＳＯ_４、ＳｒＳＯ_４、ＣａＳＯ_４垢的沉积问题，利用电子计算机来模拟地层水和注入水混合引起的结垢趋势，提出了在油藏不同条件下硫酸盐垢的预测模型和高精度的数值模拟方法，研制了具有全面预测功能的软件系统。

In Changqing oilfield ,there is a large amount of Ba^(2+),Sr^(2+),Ca^(2+) in formation water and SO_4^(2-) in the injected water (Luo He water). Since 1979,the sulfate precipitation was discovered in many places of the oilfield. The problem about precipitation of BaSO_4, SrSO_4 and CaSO_4 is considered in oilfield operation. The prediction model and the numerical simulationmethod for sulfate precipitation are studied.