文昌13-1油田含水上升机理研究及挖潜措施

Study on water rising mechanism and capacity enhancement in Wenchang13-1 oilfield

文昌13-1油田综合含水已达60%,采油速度相对开采初期明显下降。为了保持油田合理的采油速度,提高经济年限内的最终采收率,对文昌13-1油田含水上升机理进行了研究,并提出了治理措施。研究结果表明,构造因素、储层非均质性和采液强度是影响油井含水上升及开发效果的本质因素。针对海洋石油开采的特殊情况,以文昌13-1油田为例,研究了不同类型储层的含水上升规律,提出了卡层、提液、酸化解堵、堵水等降水稳油的挖潜措施。现场应用表明,挖潜效果良好,有效地延缓了油田含水的上升速度,为实现油田的均衡开采提供借鉴。

Overall water cut of Wenchang13-1 oil field has come to 60% and oil production rate dropped obviously compared with that of the early producing stage.Water rising mechanism was studied and according measures were proposed in order to maintain a reasonable producing rate and enhance the ultimate recovery in the economical period.Results show that the structure,reservoir heterogeneity as well as liquid production per unit thickness are the essential factors influencing water rise and development effect.Taking Wenchang13-1 oil field as an example,measures of stuck layer,withdrawing liquid,acidizing break down and plugging water were developed according to the special conditions of offshore production and water rising laws of different types of reservoirs.Field practice show that the method can enhance capacity greatly and delay ascending velocity of water cut effectively,and thus can provide useful reference to the oil field balance production.