新沟油田二次开发技术探索与实践

Development and Application of Re-development Technology in Xingou Oilfield

针对新沟油田长期处于低速开采的问题,运用构造精细解释、精细储层刻画、测井解释图版修正、剩余油描述、井网重组重建等方法,开展了新沟油田二次开发的技术研究。研究表明,新沟油田分上下2套层系,采用1套井网、分层开发调整的方式。上层系新下31-2进行井网重组,利用老井转注和油井分层开采改善水驱效果;下层系新下34-6进行井网重建,利用新钻井提高储量动用程度。提出新井井位16口,油水井措施23井次,自然递减率由12.93%下降到-1.63%,采油速度提高2.5倍,采收率提高6.6个百分点。

As Xingou Oilfield is developed at low speed for a long time,a multitude of approaches such as fine interpretation and characterization of structures/reservoirs,correction of logging interpretation type curve,description of residual oil and reconstruction of well pattern are used to make technical research on re-development of the oilfield. Research results indicate that,there are upper and lower layer series in Xingou Oilfield,where one set of well pattern and layered development and adjustment are applied.Well pattern is re-organized for the upper layer series( Xinxia 31-2). Injectors are transformed from old producers and oil layers are zoned to improve the water flooding effect. Well pattern is re-organized for the lower layer series( Xinxia 34-6). New drilling wells are used to enhance the producing degree. Furthermore,16 new well locations are proposed; 23 well-times of measures have been taken for producer and injectors; the natural decline rate decreased from 12. 93% to-1. 63%; the oil production speed increased by 2. 5 and the recovery ratio increased by 6. 6%.