Abstract: Muddy interlayers are developed in Fengcheng super-heavy oil reservoir in Xinjiang，featuring extensive distribution，large thickness and poor permeability. As a result，the steam chamber fails to effectively affect the reservoir near the interlayers during conventional SAGD and vertical well-assisted SAGD. Aiming at the engineering problem that muddy interlayers seriously impede the flow through reservoir，this paper takes a SAGD well group in Fengcheng Oilfield as the research object. By way of drilling multilateral wells through its upper interlayers from the steam injection well，water was injected stage by stage to increase the pressure and expand the capacity，so as to achieve the purpose of reservoir stimulation. In addition，a finite element calculation model of reservoir stimulation by increasing the pressure stage by stage for the SAGD of multilateral wells containing interlayers was also established. The calculation results show that the formation pore pressure increases significantly in the areas near the multilateral wells. The capacity expanding area starts from the intersection of the lateral well and the steam injection well，and gradually extends outward. Finally，the effective capacity expansion covers reservoir in the vertical direction of 10 m and the horizontal direction of 5 m. In this scope，the increase range of porosity increases with the increase in the viscosity of the injected fluid. On this basis，the curve of construction flow rate versus wellhead pressure was established to provide basis for the design of field construction parameters. After multilateral wells were drilled in the field，the well group was subjected to micro-fracturing for capacity expansion. Compared with other well groups in the same block，the preheating period of this well group was shortened by 60 days，the average daily production increased by 5.6 t/d after 300 days of normal production，and the oil/steam ratio increased by 0.05. This shows that the stimulation effect of super-heavy oil reservoir containing muddy interlayers by drilling multilateral wells is satisfactory.

Key words: super-heavy oil, micro-fracturing, multilateral wells, SAGD, muddy interlayer

摘要： 新疆风城超稠油储层泥质夹层发育，具有分布范围广、厚度大、渗透性差等特点，导致传统SAGD（蒸气辅助重力泄 油）和直井辅助SAGD开采时蒸汽腔无法有效波及夹层附近区域储层。针对泥质夹层严重阻碍储层渗流这一工程问题，以 新疆风城油田某SAGD井组为研究对象，采用从注汽井中钻多分支井贯穿其上部夹层的方式逐级注水提压扩容改造储层， 并建立含夹层多分支井SAGD逐级提压改造的有限元计算模型。计算结果表明，多分支井附近区域的地层孔隙压力明显升 高，扩容区域从分支井与注汽井交汇处开始逐步向外延伸，最终有效扩容垂直方向10 m、水平方向5 m范围的储层，该区域 范围的孔隙度提高幅度随注入液黏度的增加而增加。在此基础上，建立施工排量和井口压力的关系曲线，为现场施工参数 设计提供依据。现场对1井组钻多分支井后微压裂扩容，与同区块井组对比预热周期缩短了60 d，正常生产300 d，平均日产 量提高了5.6 t，油汽比提高0.05，表明多分支井改造含泥质夹层的超稠油储层能够取得较好的提产效果。

关键词: 超稠油；微压裂；多分支井；SAGD；泥质夹层