摘要
为了进一步提高致密油储层超临界CO_(2)吞吐的开发效果,探索适合致密油藏的超临界CO_(2)-气溶性表面活性剂复合吞吐技术,通过原油黏度实验、油气界面张力实验、最小混相压力实验、原油膨胀系数实验以及超临界CO_(2)-气溶性表面活性剂复合吞吐模拟实验,评价了不同类型气溶性表面活性剂的性能及其对吞吐采收率的影响。结果表明:气溶性表面活性剂GRS⁃1的综合性能更加突出,随着气溶性表面活性剂质量分数的不断增大,原油黏度、油气界面张力和最小混相压力均呈现出逐渐降低的趋势,而原油体积膨胀系数则逐渐增大,并且岩心的吞吐采收率和入口端压力也呈现出逐渐增大的趋势;随着混合流体注入量的增加以及闷井时间的延长,岩心吞吐采收率和入口端压力均逐渐增大,并且岩心的渗透率越大,吞吐采收率就越高;超临界CO_(2)-气溶性表面活性剂复合吞吐的最佳实验参数为气溶性表面活性剂GRS⁃1的质量分数0.6%、混合流体注入量0.5 PV、闷井时间3 h、吞吐轮次3次。该复合吞吐技术能够显著提高致密油藏的采收率,对高效开发致密油藏具有指导意义。
In order to further improve development effect of supercritical CO_(2) huff and puff in tight oil reservoirs and explore suitable supercritical CO_(2)-soluble surfactant composite huff and puff technology for tight oil reservoirs,oil viscosity experiment,oil-gas interfacial tension experiment,minimum miscibility pressure experiment,oil expan⁃sion coefficient experiment and supercritical CO_(2)-soluble surfactant composite huff and puff simulation experiment are carried out to evaluate performance of different types of gas-soluble surfactants and their impact on huff and puff recovery.The results show that comprehensive performance of gas soluble surfactant GRS-1 is more prominent.As mass fraction of gas-soluble surfactant continuously increasing,oil viscosity,oil-gas interfacial tension and mini⁃mum miscibility pressure all show gradually decreasing trend,while oil volume expansion coefficient gradually in⁃creases.Meanwhile,huff and puff recovery and inlet pressure of core also show gradually increasing trend.As injec⁃tion rate of mixed fluid increases and soaking time prolongs,huff and puff recovery and inlet pressure of core gradu⁃ally increase,and the higher the core permeability is,the higher the huff and puff recovery is.The optimal experi⁃mental parameters for composite huff and puff of supercritical CO_(2)-soluble surfactant are:mass fraction of gas-solu⁃ble surfactant GRS-1 is 0.6%,injection rate of mixed fluid is 0.5 PV,soaking time is 3 h,and huff and puff has 3 cycles.This composite huff and puff technology can significantly improve recovery of tight reservoirs,and has guid⁃ing significance for efficient development of tight reservoirs.
作者
刘明
蓝加达
潘兰
李彦婧
刘昊娟
LIU Ming;LAN Jiada;PAN Lan;LI Yanjing;LIU Haojuan(Taizhou Oil Production Plant of Sinopec East China Oil&Gas Company,Taizhou 225300,China;Research Institute of Exploration and Development,Sinopec East China Oil&Gas Company,Nanjing 210011,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2024年第1期68-76,共9页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油化工集团有限公司科技开发部项目“南川复杂构造带页岩气勘探开发关键技术”(P19017-3)。
