天然水驱稀油油藏提高采收率技术对策研究

Research of EOR Technical Measures for Natural Water Drive Thin Oil Reservoir

南堡陆地浅层油藏为典型复杂断块油藏,按照油品划分60.9%的地质储量属稀油油藏,具有边底水活跃,油藏断块小,含油面积小的地质特征。目前其已进入特高含水开发阶段,水驱采出程度低,采收率低,急需开展技术攻关提高油藏采收率。针对油砂体含油面积小且天然能量充足的油藏地质特征,以高63⁃10断块NmⅡ4②小层为典型单元,提出采用深部吞吐驱油方式,该驱油方式可以提高油藏波及体积和驱油效率,具有小规模、低投入且调整灵活的技术优势,为同类油藏特高含水阶段开发调整提供技术借鉴。

Nanbao shallow reservoir is a typical complex fault block reservoir.According to oil products,60.9%of the reserves belong to conventional thin oil reservoirs.The reservoir has the geological characteristics of active marginal and bottom water,small fault block and small oil area and has come into extra high water cut stage.Because of low water flooding production rate,it is urgent to carry out technical research to further improve reservoir recovery.The paper regarded the reservoir of NmⅡ4②layer in Gao 63⁃10 block as a typical unit.According to the geological characteristics of small oil sands area and sufficient natural energy,the paper puts forward a new oil drive method named deep huff and puff.Based on the oil well,this new oil drive method can improve the swept volume and flushing efficiency and has the advantages of small scale,low investment and flexible adjustment.It provides technical reference for development and adjustment of similar reservoirs at extra⁃high water cut stage.