摘要
考虑到超前注水压力敏感而导致介质变形引起的孔隙度和渗透率的降低,但仍属于特低渗油藏,存在启动压力梯度[1-3],理论推导超前注水呈双曲递减规律,超前注水和同步注水递减曲线特征基本相同,递减率Di=0.21;超前注水提前提高了原始地层压力保持水平,油井初期产能得到提高,同时,压力保持水平的提高,影响到油藏中后期开发油井含水上升速度加快。同步注水无水采油期(稳产期)特征比较明显,超前注水无水采油期短,水驱特征曲线表明超前注水水驱提前,同样采出程度,含水上升较快,最终采收率同步注水高于超前注水。
Considering the advanced water injection pressure sensitive leads to the decrease of deformation caused by porosity and permeability, but still belongs to the low permeability reservoir, starting pressure gradient[1-3], theoretical derivation of advanced water injection showed regular hyperbolic decline, advanced water injection and synchronous water injection decline curve feature based the same decline rate, advanced water injection improves the original formation pressure in advance maintain the level of oil well productivity is improved, at the same time, keep the pressure to raise the level of influence to the late water rise speed. Synchronous injection water free oil production period（stable stage） are the obvious features of advanced water injection water free oil production period is short, that advanced water in-jection water flooding characteristic curve in advance of water flooding, the same production degree, water content increased rapidly, and the final recovery rate was slightly larger than that of the advanced water injection.
出处
《石油化工应用》
CAS
2016年第8期28-31,共4页
Petrochemical Industry Application
关键词
递减规律
超前注水
采收率
无水采油期
diminishing law
advanced water injection
recovery ratio
absolute production period
