提高厚层稠油油藏开发效果研究与实践

Research and Practice to Improve Producing Performance of Ultra Heavy Oil Reservoir

针对S块蒸汽吞吐后期原油产量递减加快、吞吐效果变差、油层动用不均等诸多开发矛盾,开展以精细油藏描述、开发潜力评价等二次开发研究工作。剩余油研究结果表明,采用100m井间正方形井网井间剩余油富集,含油饱和度在58%以上;由于含油井段长,受蒸汽超覆影响,油层纵向上动用不均。通过二次开发研究认为,采用加密水平井、蒸汽辅助重力泄油、叠置水平井等技术可提高该块采收率36%,同时取得了较好的开发效果。S块二次开发的成功为同类油藏提高开发效果提供借鉴。

Aim to the oil production decline, the poor performance in cyclic steam stimulation （CSS） and the production heterogeneity in area and in vertical section, the refined reservoir description and development potential researches have been carried out in Block S. The remained oil distribution research results show that the place of vertical wells with well spacing 100m is higher than other area and the oil saturation is more than 58%. For the thick oil and steam overriding, the oil layer in vertical shows the production heterogeneity. In this block, the infill horizontal well, steam assisted gravity drainage （SAGD） and duplicated horizontal well can improve the oil production and the EOR factor reaches to 36%. And at the same time, the practice gained good performance, which provides the references for the similar reservoir.