摘要
为明确致密砂岩储层的吞吐渗吸采油机理,优选最佳吞吐渗吸介质,建立了可准确模拟致密储层动态高温高压吞吐渗吸采油过程的物理模拟实验方法和装置,并选取松辽盆地北部致密砂岩储层天然岩心,开展了孔渗物性、油水黏度比、润湿性、渗吸体面比、渗吸介质及生产压差等因素对致密储层吞吐渗吸开发效果的影响实验研究。结果表明:松辽盆地北部致密砂岩储层吞吐渗吸采出程度随着孔渗物性的增加而增大,随着油水黏度比和渗吸体面比的增大而减小;相同物性级别的亲水岩心渗吸驱油效果好于亲油岩心;裂缝的存在可增加渗吸开发效果;在渗吸置换作用的范围内,提高生产压差对增加渗吸驱油效果的作用不显著,但可提高返排效率。研究认为,活性水的渗吸驱油效果好于低矿化度清水,低矿化度清水好于模拟地层水,胍胶压裂液滤液对储层有一定的伤害,其吞吐渗吸驱油效果较差,建议缩短压裂液在地层中的滞留时间。研究成果可为松辽盆地北部致密砂岩油藏吞吐渗吸开发技术的高效应用提供借鉴和指导。
In order to further clarify the displacement mechanism of huff-puff imbibition in tight sandstone reservoir and optimize huff-puff imhibition media＋ the laboratory physical simulation method and device are established accurately model the dynamic pnduction process of high temperature-pressure huff-puff imbibition in tight sandstone reservoir. The natural core samples of tight sandstone reservoir in northern Songliao Basin arc taken to ooduct laboraty experiments anti identify the effects of poroperm properties, oil-water viscosity ratio, wettahility, intbibi- tion volume-surface ratio, irobibition media, producing pressure drawdown and other factom on the huff-puff imbi- bition pcrformmlee in tight sandstone reservoir. Researeh indicates that The huff-puff imbibition recovery degree; in the tight sandstone reservoir of northern Songliao Basin increa.ses with the inere of reservoir poropenn properties and decreases with the increase uf oil-water viscosity ratin and intbibition volume-surface ratio. The imbibition dis- placement perfommnce of water-wet sample is better than that of oil-wet sample unde.r the eonditinn of equal po- ropemt properties. Fracture can enhance the imbibition displacement performance. There is no significant effeel on imbibition performance by increasing producing pressure drawdown within the range of imbibition displacemctd, but it can increasethe flowback ratio. The imbibition displaeement performances of different water types from high to low are active water, low-salinity ater and simulated lormation water. The huff-puff imbibition displacement perfrmanee of guar gum tacturing fluid is relatively poor due to its damage to reservoir and it is suggested to its esidenee time in formation. This research could provide certain refercnee and guidance for the mentation of huff-puff imbibition displacement in the tight sandstone reservoir of northern Songliao Basin.
出处
《特种油气藏》
CAS
CSCD
北大核心
2018年第1期140-145,共6页
Special Oil & Gas Reservoirs
基金
中国石油天然气股份有限公司科技重大专项"难采储量有效动用技术研究与试验"(2016E-02-10)
关键词
松辽盆地北部
致密砂岩油藏
吞吐渗吸
实验方法
影响因素
northern Songliao Basin
tight sandstone reservoir
huff-puff imbibition
experiment method
influencing factor
