基于储集层特征分析、油藏数值模拟和生产动态分析,研究塔里木盆地海相砂岩油藏水平井水淹规律及其模式.与陆相砂岩油藏相比,塔里木盆地海相砂岩油藏具有原油黏度低、储集层连续性好、夹层发育等特征,加之大规模使用水平井开发,在开发规律上表现为开采速度快、采出程度高的开发特征.储集层渗流屏障、注采井网、优势通道等因素都会造成水平井段出水不均匀,为此提出4类9种典型水平井水淹模式,根据不同出水机理、剩余油分布特征提出治理对策.利用水油比导数曲线拐点特征,可判别水平井水淹模式.水平井水淹规律及其模式的研究和总结可为塔里木盆地海相砂岩油藏水平井稳油控水政策的制定提供依据.%Based on geological analysis,reservoir numerical simulation and production performance analysis,water-out performance and pattem of horizontal wells in Tarim marine sandstone reservoir were studied.Compared with continental sandstone reservoirs,the marine sandstone reservoirs in Tarim Basin were characterized by low oil viscosity,good reservoir continuity,and development of interbeds,which together with the large amount of horizontal wells,resulted in fast production rate and high recovery degree of the reservoirs.The main controlling factors of uneven water-out in horizontal wells were reservoir seepage barrier,injection-production well pattern,and dominant seepage channel.Thus 9 types in 4 categories of typical water-out pattern of horizontal wells in Tarim marine sandstone reservoirs were identified,and water-out management measures were proposed for them respectively according to their water-out mechanism and remaining oil distribution characteristics.Finally,the water-out pattern can be identified based on the inflection characteristics of derivative curve of water-oil ratio.This study of the water-out pattern can provide guidance for the adjustment policy of water injection in horizontal wells in marine sandstone reservoirs of Tarim Oilfield.
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