微量元素示踪剂井间监测技术在Y油田的应用

APPLICATION OF INTERWELL MONITORING TECHNIQUE BY USING MICROELEMENT TRACER IN Y OILFIELD

Y油田东河砂岩油藏平面与纵向上具有较强的非均质性,注采井组内油井受效情况不均衡。之前主要应用稳定同位素监测井间连通状况及注入水速度、推进方向等,但受限于可用同位素品种较少且水样后处理存在较强放射性,近年逐渐改用品种较多、全程无放射性的微量元素示踪剂。现以A油田东河砂岩油藏3个相邻注采井组为例,通过362天的取样监测,13口油井中有6口井见到示踪剂显示,推进速度3.02~4.78 m/d,基本符合井组的生产动态变化,表明微量元素示踪剂在本区有较好的适应性。迄今微量元素示踪剂在Y油田应用21井次,在K、L、T等老区应用近90井次,为下步高含水井稳油控水、区块生产调整提供了很好的技术支持。

Donghe sandstone reservoir of Y oilfield is characterized by strong anisotropism,which leads to an effectiveness imbalance in the injection- production well group. The interwell connectivity,direction of water flooding and velocity of injected water have been observed by supervising stable isotope. But only a few kinds of isotope are available,which can easily be interfered by other wells. Also,the post- processing water sample has high levels of radioactivity. Many more kinds of entirely nonradioactive microelement have been used in recent years. Now illustrated by three well groups of Hudson oilfield Donghe sandstone reservoir,water samples of 362 days have been collected and supervised. Tracers have been observed in 6 of 13 oil wells and the flooding velocity is 3.02 ~ 4.78 m / d,which are consistent with the supervised stable isotope before and the present dynamic change of production. All of these show that microelement tracer is well adaptive to the reservoir. So far,the technique has been put into use of 21 wells in Hudson oilfield. The number is totally nearly 90 wells including K、L and T oilfield,which provides good technical supports for controlling water cut,stabilizing oil production in high watercut well groups and production adjustment in the block.