薄互层超稠油油藏具有净总厚度比小、纵向非均质性强及蒸汽超覆严重的特点,为明确该类油藏蒸汽驱提高采收率的可行性及影响因素,以杜80块兴隆台油层为目标,借鉴其他类型超稠油油藏蒸汽驱的成功经验,以数值模拟技术和动态分析为手段,开展油藏工程优化设计研究。结果表明:杜80块兴隆台油层中稳定发育5 m左右的泥岩隔层,可细分为2套开发层系独立开发;井网井距为70 m井距反九点井网,注汽速率为1.7～1.9 t/(d·m·hm2),采注比为1.1～1.2,井底蒸汽干度以大于50%为最佳,确定转驱时机为油藏温度大于80 ℃;根据小层厚度及级差界限,分别采用4、8、12、16 孔/m的孔密射孔。蒸汽驱现场先导试验取得了单井日产油、采油速度翻倍的良好效果。研究结果为薄互层超稠油油藏蒸汽吞吐后转换开发方式提供了技术支持。
Thin interbedded ultra-thick oil reservoirs are characterized by small net total thickness ratio, strong longitudinal inhomogeneity and severe steam overlap. In order to clarify the feasibility and influencing factors of steam flooding for enhanced oil recovery in such reservoirs, a study was made on the reservoir engineering optimization design by means of numerical simulation technology and dynamic analysis, taking Xinglongtai reservoir in Block Du 80 as the target, with reference to the successful experience of steam flooding in other types of ultra-heavy oil reservoirs. As found in the results, in Xinglongtai oil reservoir of Block Du 80, the mudstone interbed of about 5 m is stably developed, which can be subdivided into 2 development layers for independent development; the wells were arranged into inverted nine-spot pattern with well spacing of 70 m, the production and injection ratio was 1.1-1.2, the steam injection rate was 1.7-1.9 t/(d·m·hm2), the downhole steam dryness was greater than 50% as the best, and the time of flooding conversion is determined as the time when the reservoir temperature is greater than 80 ℃; the perforation density was determined as 4, 8, 12 and 16 holes/m respectively according to the thickness of the sub-layer and the range limit. The field pilot test of steam flooding has achieved good results in doubling the daily oil production and oil recovery rate of single well. The study results provide technical support for the conversion of development mode after steam stimulation in thin interbedded ultra-heavy oil reservoirs.
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