稠油蒸汽吞吐后期增产技术现状与前景

目前,国内外许多油藏已处于蒸汽吞吐的后期。此时的油藏油气比低、含水量高、地层压力低、井况差、周期注气量大、操作成本高,产油更加困难。改善蒸汽吞吐后期的采油技术,可以最大限度的提高油藏的采收率。如今,应用于蒸汽吞吐后期增产的方法有:应用助剂改善吞吐效果、间歇注汽技术、"一注多采"技术、多井整体吞吐技术、注采参数优化技术、侧钻水平井技术、蒸汽驱技术、蒸汽辅助重力泄油技术和火烧油层技术等。然而,现在我国还在尝试发展一些新的技术,如水平压裂辅助蒸汽驱和多井组整体优化蒸汽驱等等。这使得蒸汽吞吐后期的增产技术拥有更为广阔的前景。

Current Situation and Prospect of Enhanced Oil Recovery Technologies for Heavy Oil Reservoir in Its Later Stage of Steam Stimulation

Now, many reservoirs are in the steam stimulation later stage. So reservoirs’ oil-gas ratio is low, the moisture is high, the formation pressure is low, well conditions are poor,cyclic steam injection is more, operation cost is high, oil production is more difficult. Improving the later steam stimulation techniques can maximize oil recovery.The methods used in the later steam stimulation stage to increase production include： using adjuvant to improve steam stimulation,intermittent steam flooding,one steaming well and multi-well production,multi-well steam stimulation,optimizing injection-production rating,sidetrack drilling horizontal well, steam driving,SAGD,ISC and so on.However,we are trying some new technologies, including FAST and multiple well groups steam driving and so on, which can make the prospect of increasing production in the later steam stimulation stage more extensive.