【摘要】：針對高凝油注水開發(fā)中蠟析出造成孔隙堵塞、滲透率下降這一問題,推導蠟沉積量與孔隙度、滲透率變化關系,建立水驅油藏滲流場與蠟沉積的耦合模型,對比地表水常溫及適當升溫(25、35、45、55、65℃)注入時,含水飽和度分布及孔隙度、滲透率降低情況。結果表明:注入冷水導致近井地帶溫度降至析蠟點以下,蠟晶顆粒大量析出,地層采出水(45℃,不加熱)回注時,注水1 a后水井附近30 m溫度受到影響,平均累積沉積量約占孔隙體積的4%;隨著溫度降低,含水飽和度前緣躍變程度減弱,滲透率與初始滲透率比值由93%降到72%;地層冷傷害隨時間延長加劇,但增加速率逐漸減小,并逐漸向油層深部推進。
[Abstract]:In order to solve the problem of pore blockage caused by wax precipitation and the decrease of permeability, the relationship between wax deposition quantity, porosity and permeability is deduced, and the coupling model of seepage field and wax deposition in water drive reservoir is established. Compared with the surface water at room temperature and proper temperature (25 ~ 35 ~ 45 ~ 45 ~ 55 ~ 65 鈩，

本文編號：2384467