低渗透油田超前注水技术研究及应用

Study on Advanced Water Injection Technology for Low-permeability Oilfield and Application

针对低渗透油田存在启动压力梯度和介质变形的特点,在借鉴国内外油田开发经验的基础上,研究了利用超前注水技术开发低渗透油田的机理及相关参数确定方法。研究表明,超前注水可建立有效的压力驱替系统,降低因地层压力下降造成的地层伤害,降低油井初始含水率,有利于提高最终采收率。合理确定压力保持水平,注水压力,累计注水量,注水强度,注水时机,油井投产时机,采油井合理流压等参数,可以提高单井产量。现场实践表明,应用超前注水技术开发低渗透油田可取得好的效果,对同类油田开发具有借鉴和指导作用。

In view of the existence of characteristics of threshold pressure gradient and medium deformation for low - permeability oilfields, based on oilfield development experience at home and abroad, the mechanisms and how to select related parameters using advanced water injection technology for the development of low - permeability oil- fields were studied. Research results have shown that advanced water injection can establish an effective pressure displacement system, reduce the formation damage due to the formation pressure drop, decrease the initial water cut and help increase the ultimate recovery. Reasonably determining such parameters as pressure level, injection pressure, cumulative injection amount, injection intensity, injection timing, well production time, flow pressure of production well and so on can improve the single well production. Field practice shows that the application of advanced water injection technology in low - permeability oilfields can obtain good results and can provide reference and guidance for the same oilfields development.