【摘要】：大慶外圍A區(qū)塊構(gòu)造位置位于松遼盆地西部斜坡區(qū)的泰康隆起西南部A區(qū)塊-二站鼻狀構(gòu)造上,地層自下而上發(fā)育泉頭組、青山口組、姚家組、嫩江組、四方臺組、明水組、第三系、第四系地層,整體來講為層狀構(gòu)造油氣藏,局部受巖性因素控制,但層與層之間的油氣聚集因素略有差別。為加快該區(qū)塊稠油資源的動用,圍繞稠油冷采降粘相關(guān)技術(shù),開展了大量室內(nèi)驅(qū)油實(shí)驗(yàn),以確定最優(yōu)開采方式,為該區(qū)塊稠油的開發(fā)提供技術(shù)指導(dǎo),確保高效開發(fā)。本文結(jié)合大慶外圍A區(qū)稠油物性,在室內(nèi)開展了熱采、化學(xué)驅(qū)油、泡沫驅(qū)油、煙道氣驅(qū)油實(shí)驗(yàn),對于每一種驅(qū)油方式,通過改變其中某一變量,考察原油采收率變化,并結(jié)合各種儀器分析手段,選取最優(yōu)參數(shù)。研究結(jié)果表明,隨著溫度的升高,稠油粘度能迅速發(fā)生變化,當(dāng)溫度在80℃以上時(shí),粘度降幅變緩,當(dāng)溫度在80℃以上時(shí),能大幅提高稠油的最終采收率。60℃下的提高稠油采收率為27.9%,而在150℃時(shí)能可達(dá)到54.8%。提高注水的溫度,有效抑制產(chǎn)水率的上升,降低注水時(shí)的壓力梯度。將水驅(qū)改為蒸汽驅(qū),能提高稠油的最終采收率,隨著蒸汽溫度的不斷升高,稠油的最終采收率也相應(yīng)增大。蒸汽驅(qū)溫度遠(yuǎn)高于水驅(qū),200℃條件下蒸汽驅(qū)最終采收率可達(dá)到58%,而在274℃蒸汽驅(qū)作用下,最終采收率可達(dá)到67.5%。降粘劑驅(qū)油實(shí)驗(yàn)表明,3#表面活性劑降粘、配伍性和吸附等性能較好,最終采收率可高達(dá)40%左右,其合理的使用濃度為0.3%,合理注入量為0.5PV。泡沫驅(qū)氣液比為1:2,注入量為0.45PV時(shí)采收率最高,達(dá)到27.67%。CO2氣體產(chǎn)生泡沫的采收率高,可達(dá)45.83%。煙道氣驅(qū)替稠油的效率較低,改為污水/煙道氣交替驅(qū)替時(shí),能明顯提高稠油最終采收率,效果優(yōu)于僅用污水驅(qū)或僅煙道氣驅(qū)。當(dāng)氣水比1:1時(shí)采收率最大,可達(dá)32.2%。通過分析不同段塞組合方式,優(yōu)選最佳方式下的混注比例,結(jié)合礦場實(shí)際情況,對指導(dǎo)油田生產(chǎn),提高油藏最終采收率具有參考意義。
[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，

本文編號：2225154