受油藏非均质性影响,无隔夹层边顶水的巨厚块状超稠油油藏SAGD蒸汽腔纵向发育不均衡,存在边顶水下泄风险。针对该问题,通过对辽河油田杜84块SAGD蒸汽腔的精细描述,立体刻画了蒸汽腔空间展布特征,并通过数值模拟对SAGD井组停止注汽、降低注汽量、间歇注汽、注非凝析气4种调控方式进行优化对比,论证不同开发方式对蒸汽腔扩展的影响,提出了SAGD蒸汽腔均衡调控对策。结果表明:4种调控方式均可抑制汽腔继续向上扩展,其中,间歇注汽更易于均衡汽腔,节约蒸汽用量,延长开发期,且具有油汽比高,净产油量高的生产特点。该研究对SAGD汽腔描述及控制技术具有技术指导意义。
Affected by the heterogeneity of the reservoir, the SAGD steam chamber in super-thick massive extra-heavy oil reservoir with no interlayer and top-edge water was unevenly developed in the vertical direction, with a risk of top-edge water drainage. In response to this problem, the spatial distribution characteristics of the steam chamber were three-dimensionally characterized based on the detailed description of the SAGD steam chamber in Block Du 84 of Liaohe Oilfield, steam injection interruption, steam injection reduction, intermittent steam injection and non-condensate gas injection were optimized and compared through numerical simulation, the impact of different development modes on the expansion of steam chamber was demonstrated, and the SAGD steam chamber balance control strategy was proposed. The results showed that the four control methods all restrained the steam chamber from expanding upward, and the intermittent steam injection was easier to balance the steam chamber, reduce steam consumption, extend the development period, with the production characteristics of high oil-steam ratio and high net oil production. There is much for technical guiding significance of this study to the description and control technology of SAGD steam chamber.
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