江苏油田砂岩酸压增注技术研究与应用

Study and application of sandstone acid fracturing stimulation of injection wells in Jiangsu oilfield

针对江苏SN油田高压注水井达不到配注要求,采用常规酸化增注措施无效的情况,进行砂岩储层酸压尝试。分析了砂岩储层一般不能进行酸压的原因,提出砂岩储层酸压成功需具备的条件,并在室内对油田岩样进行了酸蚀裂缝导流能力试验。结果表明,酸蚀后岩样不但结构完整,而且获得了良好的导流能力,认为在砂岩油藏进行酸压是可行的。现场应用新型非活性硝酸粉末液进行了7口井的砂岩酸压增注施工,取得了很好的降压增注效果。

Acid fracturing is usually used in carbonate reservoirs.In SN oilfield of Jiangsu,the normal acidizing stimulation measures in high-pressure injection wells were invalid.So acid fracturing was carried out in sandstone reservoirs,and it was successful.The paper analyses the conditions necessary for a successful sandstone reservoir acid fracturing.The laboratory test of core conductivity after acid corrosion was carried out.It is shown the core not only has integreted structure,but also good conductivity.The ...