嫩303井低渗透超薄油层高产稳产的原因及启示

低渗透超薄油层一般不具备高产的条件，也不利于稳产。松辽盆地南部南山湾地区中部组合砂岩极不发育，仅发育一套砂岩，厚度极薄，且渗透率很低，但嫩303井试油获得了高产油流，试采取得了10t／d以上高产稳产6年的好效果，其原因值得关注和探讨。通过对嫩303井区油藏地质和开发动态特征的深入分析，认为异常高压是高产的主要原因之一，也是稳产的唯一原因。从嫩303井可以得到这样的启示：高压开采是提高低渗透油田开发效果的根本性措施，异常高压油田应早期注水保持高压开采，正常压力油田开发可以采取超前注水的办法实现高压开采。

Cause and Inspiration of High and Stable Oil Production of Low Permeable and Ultra-thin Reservoir in Well N303

Low permeable and ultra-thin reservoirs have no condition for high or stable oil production.The combination sandstone in central Nanshanwan area in southern Songliao Basin develops a little.Only one set of sandstone develops there with small thickness and low permeability.However,Well N303 obtained high commercial oil production.Production test got a good effect with a stable production of more than 10t/d for 6 years.Analysis on reservoir geology and development dynamic performance of Well N303 shows that abnormal high pressure is a main cause for high production and only cause for stable production.It gives the following inspiration: production with high pressure is a key measure for improving development effect of low permeable oil fields.Water flooding should be performed in oil fields with abnormal high pressure so as to keep high pressured production.Advancing water flooding can be performed in normal pressure oil fields in order to realize high pressured production.