鲁克沁稠油油藏泡沫驱扩大试验区方案优化

发布时间：2018-08-29 14:27

【摘要】：鲁克沁扩大试验区位于TY区块,自1998年开始进行水驱开发,截止到2015年3月底,油井总数41口,水井13口,累积注水129.12×104m3,累积产油53.88×104t,综合含水率74.7%,采出程度仅7.32%OOIP,油层中剩余大量原油未被采出,仍具有大幅度提高采收率的潜力。2015年4月先导试验区开展了泡沫驱油试验。其中先导试验区共4口注水井,19口油井。开展泡沫驱后,大部分油井日产油量增加,综合含水率大幅度下降;吸水剖面得到了明显改善,其中TY203井、TY3-3井的Hall曲线斜率上升幅度较大。截止到2015年10月,先导试验区累积增油0.9×104t3,综合含水率下降10%,因此泡沫驱可能是提高中温高盐稠油油藏采收率的一种有效办法。根据先导试验区的生产动态分析发现,仍有部分油井增产效果不明显,仅仅起到了控水的作用,更有少数油井不仅产量没有提高,综合含水率依然居高不下。通过分析发现,注采比例、泡沫段塞大小、气/液比、交替周期及注采速度可能是影响泡沫驱提高采收率的关键。因此,为了能更好的将泡沫驱技术应用于整个鲁克沁油藏的开发,需对扩大区方案设计进行优化,进一步评价泡沫驱的驱油效果。在完成扩大试验区地质模型的建立及生产动态拟合的前提下,对水驱开发进行了预测,当全区综合含水上升到90%时,水驱采收率为15.26%,累积产油111.50×104t。目前确定使用的泡沫驱油体系为C DHY-4、有效浓度0.1%(1000mg/L),通过对泡沫驱注入程序、注入方式及段塞大小的优化后,确定泡沫深部调驱和泡沫调驱2种方案。其中泡沫深部调驱最终参数:主段塞为0.2PV、起泡剂CDHY-4浓度(有效)0.1%,前置段塞浓度为0.2%、段塞大小为0.003PV,气/液比1.0/1.0,气液交替周期为45d,注入速度为目前实际工作制度的1.5倍。泡沫调驱最终参数:主段塞为0.45PV、起泡剂CDHY-4浓度(有效)0.1%,前置段塞浓度为0.2%、前置段塞大小为0.02PV,气/液比1.0/1.0,交替周期为60d、注入速度为目前实际工作制度的2.0倍。
[Abstract]:The Lukeqin extension pilot area is located in TY block and has been developed by water flooding since 1998. By the end of March 2015, there were 41 wells and 13 wells. Cumulative water injection of 129.12 脳 10 ~ 4 m ~ 3, cumulative oil production of 53.88 脳 10 ~ (4) t, comprehensive water cut of 74.7%, recovery degree of only 7.32 OOIP.The remaining large amount of crude oil in the reservoir has not been produced, which still has the potential of greatly improving oil recovery. Foam flooding test was carried out in the pilot zone in April 2015. Among them, there are 4 water injection wells and 19 wells in pilot test area. After foam flooding, the daily oil production of most wells increased, the comprehensive water cut decreased significantly, and the water absorption profile was obviously improved, among which the slope of Hall curve of TY203 well TY3-3 was increased greatly. As of October 2015, the cumulative oil increase of 0.9 脳 10 ~ 4t ~ (3) and the decrease of water cut by 10% in the pilot test area, foam flooding may be an effective method to improve the recovery efficiency of heavy oil reservoirs with medium temperature and high salt. According to the analysis of the production performance in the pilot test area, it is found that some oil wells have no obvious effect on increasing production and only play the role of water control, and a few wells not only have no increase in production, but also have a high comprehensive water cut. It is found that the ratio of injection and production, the size of foam slug, the ratio of gas to liquid, the alternate period and the injection / production rate may be the key factors to improve the recovery efficiency of foam flooding. Therefore, in order to better apply foam flooding technology to the development of the whole Lukeqin reservoir, it is necessary to optimize the scheme design of the expanded area and further evaluate the flooding effect of foam flooding. On the premise of establishing the geological model of the expanded test area and fitting the production dynamics, the water drive development is predicted. When the comprehensive water cut in the whole area rises to 90, the water drive recovery is 15.26 and the cumulative oil production is 111.50 脳 10 ~ 4 t. At present, the foam flooding system is determined to be C DHY-4, effective concentration 0.1% (1000mg/L). Through the optimization of foam flooding procedure, injection mode and slug size, two schemes of deep foam flooding and foam flooding are determined. The final parameters of deep foam flooding are as follows: the main slug is 0.2 PVD, the foaming agent CDHY-4 concentration is 0.1, the former slug concentration is 0.2, the slug size is 0.003 PVR, the ratio of gas to liquid is 1.0 / 1.0, the gas-liquid alternate cycle is 45 days, and the injection rate is 1.5 times that of the current actual working system. The final parameters of foam flooding are as follows: the main slug is 0.45 PVD, the foaming agent CDHY-4 concentration is 0.1%, the pre-slug concentration is 0.2, the pre-slug size is 0.02 PVV, the ratio of gas to liquid is 1.0 / 1.0, the alternate cycle is 60 days, and the injection rate is 2.0 times that of the current actual working system.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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