摘要
为了改善注蒸汽开采稠油的效果 ,开展了注蒸汽加气体开采稠油技术的室内研究和现场试验应用。室内研究表明 :①CO2 ,N2 ,N2 +CO2 3种气体高温高压下在草 10 4井稠油中溶解度随压力增大 (1～ 14MPa)而增大 ,随温度降低 (15 0 ,10 0 ,6 5℃ )而增大 ;溶解气体的稠油粘度随温度升高、压力增大而显著降低 ;②N80钢试片在 35 %N2 /9%CO2 / 1%O2 / 5 5 %H2 O体系中的腐蚀率 ,随温度升高而线性增大 (4 0～ 35 0℃、压力相应增大或保持恒定 ) ,气相无机缓蚀剂GHX 1可有效抑制这种腐蚀 ;③加入CO2 ,N2 +CO2 和N2 可极大幅度地提高蒸汽在岩心中的驱油效率。在草桥和单家寺油田 8口蒸汽吞吐井进行注蒸汽加N2 现场试验 ,油气比、单井日产油量和周期产油量都比注蒸汽井大幅度提高。注蒸汽加N2 +CO2 现场试验的初阶段已见到日产油量急剧上升的良好效果。
To improve the efficiency of steam stimulation of heavy oil reservoirs, gas/steam stimulation technique is investigated in laboratory and put into trial uses. The laboratory investigations show that ①the solubility of CO 2, N 2 and N 2+CO 2 in heavy oil of well CQ104 at HTHP conditions increases with increasing pressure (1-14 MPa) and with decreasing temperatur (150,100,65℃); the viscosity of heavy oil with gas dissolved notably decreases with increase in temperature and pressure; ② the corrosion rate of carbon steel N80 in system 35%N 2/9%CO 2/1%O 2/55%H 2O increases linearly with temperature (40-350℃) at correspondingly increased or constant pressure and inorganic gaseous phase corrosion inhibitor GHX-1 is effective against such corrosion; ③ introducing CO 2, N 2, N 2+CO 2 dramatically improves oil displacing efficiency of steam in cores. N 2/steam injection into 8 steam huff-puff wells at Caoqiao and Shanjasi oil fields leads to increase in oil-to-steam ratio and oil production of the well per day and in a cycle. Rapid rise in oil production is observed in the initial stage of N 2+CO 2/steam injection.
出处
《油田化学》
CAS
CSCD
北大核心
2002年第1期47-50,共4页
Oilfield Chemistry
关键词
注蒸汽
气体采油
N2
CO2
N2+CO2
稠油
溶解度
粘度
CO2腐蚀
缓蚀剂
驱油效率
胜利油田
gas/steam injection for oil recovery
gases (N 2, CO 2,N 2+CO 2)
heavy crude oil
solubility
viscosity
CO 2 corrosion
corrosion inhibitor
oil displacing efficiency
Shengli oil fields
