大庆外围A区块稠油降粘实验研究
发布时间：2018-09-05 18:49
【摘要】：大庆外围A区块构造位置位于松辽盆地西部斜坡区的泰康隆起西南部A区块-二站鼻状构造上,地层自下而上发育泉头组、青山口组、姚家组、嫩江组、四方台组、明水组、第三系、第四系地层,整体来讲为层状构造油气藏,局部受岩性因素控制,但层与层之间的油气聚集因素略有差别。为加快该区块稠油资源的动用,围绕稠油冷采降粘相关技术,开展了大量室内驱油实验,以确定最优开采方式,为该区块稠油的开发提供技术指导,确保高效开发。本文结合大庆外围A区稠油物性,在室内开展了热采、化学驱油、泡沫驱油、烟道气驱油实验,对于每一种驱油方式,通过改变其中某一变量,考察原油采收率变化,并结合各种仪器分析手段,选取最优参数。研究结果表明,随着温度的升高,稠油粘度能迅速发生变化,当温度在80℃以上时,粘度降幅变缓,当温度在80℃以上时,能大幅提高稠油的最终采收率。60℃下的提高稠油采收率为27.9%,而在150℃时能可达到54.8%。提高注水的温度,有效抑制产水率的上升,降低注水时的压力梯度。将水驱改为蒸汽驱,能提高稠油的最终采收率,随着蒸汽温度的不断升高,稠油的最终采收率也相应增大。蒸汽驱温度远高于水驱,200℃条件下蒸汽驱最终采收率可达到58%,而在274℃蒸汽驱作用下,最终采收率可达到67.5%。降粘剂驱油实验表明,3#表面活性剂降粘、配伍性和吸附等性能较好,最终采收率可高达40%左右,其合理的使用浓度为0.3%,合理注入量为0.5PV。泡沫驱气液比为1:2,注入量为0.45PV时采收率最高,达到27.67%。CO2气体产生泡沫的采收率高,可达45.83%。烟道气驱替稠油的效率较低,改为污水/烟道气交替驱替时,能明显提高稠油最终采收率,效果优于仅用污水驱或仅烟道气驱。当气水比1:1时采收率最大,可达32.2%。通过分析不同段塞组合方式,优选最佳方式下的混注比例,结合矿场实际情况,对指导油田生产,提高油藏最终采收率具有参考意义。
[Abstract]:The structural location of block A in the periphery of Daqing is located in block A of the southwest Taikang uplift in the western slope of Songliao Basin, and the formation of Quantou, Qingshankou, Yaojia, Nenjiang, Sifangtai and Mingshui formations is developed from the bottom to the top. The Tertiary and Quaternary strata are stratified structural reservoirs as a whole, which are controlled by lithologic factors, but the oil and gas accumulation factors between layers are slightly different. In order to speed up the production of heavy oil resources in this block, a large number of laboratory oil displacement experiments have been carried out around the viscous oil cold recovery and viscosity reduction related technology in order to determine the optimal production mode, to provide technical guidance for the development of heavy oil in this block and to ensure efficient development. Combined with the physical properties of heavy oil in the A area of the periphery of Daqing, the experiments of thermal recovery, chemical flooding, foam flooding and flue gas flooding were carried out indoors. For each oil displacement mode, the change of oil recovery factor was investigated by changing one of the variables. The optimal parameters are selected by means of instrument analysis. The results show that the viscosity of heavy oil changes rapidly with the increase of temperature. When the temperature is above 80 鈩，
本文编号：2225154
[Abstract]:The structural location of block A in the periphery of Daqing is located in block A of the southwest Taikang uplift in the western slope of Songliao Basin, and the formation of Quantou, Qingshankou, Yaojia, Nenjiang, Sifangtai and Mingshui formations is developed from the bottom to the top. The Tertiary and Quaternary strata are stratified structural reservoirs as a whole, which are controlled by lithologic factors, but the oil and gas accumulation factors between layers are slightly different. In order to speed up the production of heavy oil resources in this block, a large number of laboratory oil displacement experiments have been carried out around the viscous oil cold recovery and viscosity reduction related technology in order to determine the optimal production mode, to provide technical guidance for the development of heavy oil in this block and to ensure efficient development. Combined with the physical properties of heavy oil in the A area of the periphery of Daqing, the experiments of thermal recovery, chemical flooding, foam flooding and flue gas flooding were carried out indoors. For each oil displacement mode, the change of oil recovery factor was investigated by changing one of the variables. The optimal parameters are selected by means of instrument analysis. The results show that the viscosity of heavy oil changes rapidly with the increase of temperature. When the temperature is above 80 鈩，
本文编号：2225154
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