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首页> 外文会议>Abu Dhabi International Petroleum Exhibition Conference >Experiment and Simulation of Gas Channeling Control Technique DuringCO2 Flooding in Normal Pressure Tight Oil Reservoir of South Ordos Basin
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Experiment and Simulation of Gas Channeling Control Technique DuringCO2 Flooding in Normal Pressure Tight Oil Reservoir of South Ordos Basin

机译：南鄂尔多斯盆地普通压力密封油储油中煤气通道控制技术的试验与仿真

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HH Chang 8 tight sandstone reservoir in the South Ordos basin has been developed for more than 7 years ondepletion mode.Because of normal pressure(0.8±),extra-low permeability(<0.3×10~(-3)μm~2),heterogeneousoil bearing,development effect is not satisfied.A pilot well group was selected to conduct CO2-foamflooding in 2015,while gas channeling phenomenon is so serious that the oil stimulation is poor.To enlargeCO2 sweep efficiency,it is necessary to evaluate adaptable plugging agents and simulate the inter-wellfracture network blocking effect in tight reservoir with multiple-scale complicated fractures developed.In this study,four different openings fractures were artificial fabricated in natural crop cores based on thefracture characteristics of the reservoir.Injection performances and plugging capability of the starch gel andthe ethylenediamine were evaluated when the gas channeling phenomena appeared during CO2 floodingby the laboratory experiment and the gas channeling control adaptability were analyzed.By experimentnumerical simulation,the fracture conductivity multiple index(MULTX)was determined to simulate thefracture blocking effect.Then the reservoir simulation was conducted,classified MULTX were furtheroptimized based on plugging characteristics of complicated fractures network during CO2 flooding.Experiment results indicate that the starch gel is suitable for blocking off fractures with openings between0.42~0.65mm.While the ethylenediamine is suitable for control fractures with openings less than 0.24mm,especially for 0.08mm.In Chang 8 tight reservoir,the medium-to large-scale fracture permeability is higherthan 200 × 10~(-3)μm~2,the starch gel was applied to control the serious gas channeling.For small-to medium-scale fracture,the ethylenediamine was applied to mitigate gas channeling.Fracture blocking experimentswere numerically simulated to determine MULTX being in the range of 10~(-8)~10~(-6).Numerical simulation ofwell group blocking was conducted in the complicated fracture G&G model,MULTX was further optimizedto be lower than 10~(-6)for the medium-to large-scale fracture and 10~(-4)~10~(-3)for the small-to medium-scalefracture,keeping seepage capacity of micro-cracks.Well group CO2 flooding shows a promising improvingoil recovery,sweeping efficiency is increases from 1.4% to 24.1%,the utilization factor is 4.35 t/t oil,compared with 1.3% recovery factor of depletion mode,by 10 years CO2 periodic injection,recovery factoris enhanced by 3.76%.It is a big challenge to effectively develop the normal pressure continental deposit tight oil reservoir.In China reserves of tight reservoir amount to a large proportion in the unconventional oil reserves.Studyresults provide technology support for CO2 flooding extended test in HH Chang 8 tight reservoir,also makeCO2 flooding method successful application possible in other low pressure tight sandstone oil reservoirs.
机译：HH Chang 8南鄂尔多斯盆地砂岩储层已开发出7年以上的持续模式。因为常压（0.8±），超低渗透率（<0.3×10〜（-3）μm〜2），非底色轴承，发展效果不满足。选择飞行员井组在2015年进行CO2-泡沫塑料，而气体渠道现象如此严重，油刺激较差。对于放大扫描效率，有必要评估适应适应的堵塞剂并模拟在紧密储层中的较好井用网络阻塞效果，具有多种复杂的骨折。本研究，基于储层的近距离特性，四种不同的开口裂缝在天然作物核心中制造。注射性能和堵塞能力当在二氧化碳爆炸过程中出现气体通道现象时，评估淀粉凝胶和乙二胺。实验室实验和气体沟道控制Adapta分析了Bility。通过实验模拟，确定裂缝导电性多指数（Multx）模拟滤压效果。该储层模拟进行了分类，基于CO2泛洪期间复杂裂缝网络的堵塞特性进一步蒸馏出分类。淀粉凝胶适用于阻塞裂缝，乙二胺的开口折断裂缝适用于对照骨折，开口小于0.24mm，特别是0.08mm.in chang 8紧密水库，介质至大 - 裂缝渗透率高200×10〜（-3）μm〜2，施用淀粉凝胶以控制严重的气体通道。对于小于中等规模的骨折，乙二胺被应用于减轻气体通道。断裂阻断数值模拟的实验以确定Multx在10〜（-8）〜10〜（-6）的范围内。Numerical模拟OFWELL组阻塞在T中进行HES复杂的骨折G＆G型号，Multx进一步优化，低于10〜（-6），用于中小型骨折，10〜（-4）〜10〜（3）用于小于中型 - 粘性，保持微裂纹的渗漏能力。威尔组二氧化碳洪水显示出有希望的改善恢复，综合效率从1.4％增加到24.1％，利用因子为4.35吨/吨油，与耗尽模式的1.3％回收率相比，通过10年的CO2定期注射，回收因子增强3.76％。它是有效发展普通压力欧式沉积稀土油藏的重要挑战。中国储量储蓄金额为非规定的石油储量.SudyResults提供技术支持HH Chang 8紧储水库中的二氧化碳洪水扩展试验，也是MakeCo2洪水方法在其他低压紧密砂岩油藏中的成功应用。

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