Enhanced Oil Recovery Technology Of Flow Field Conversion On X37 Fault Block Reservoir In High Water Cut Stage

Xin37 complex block oil deposit of Dongxin oilfield,which lies between Dongying dome anticline and major axis of Xinzhen anticline,is the study zone of this paper.With the study of sedimentary characteristics of the block and problem analysis within developing as well as typical dynamic analysis,conclusions can be drawn that the main reason cause high water cut and low recovery degree of Xin37 block,is because the inherent flow line of water in high water cut stage.It forms the dominant channel or the high permeability zone,which causes the displacement efficiency falls and shape the ineffective water circulation.Through dynamic analysis and residual oil monitoring,conclusions can be drawn that the remaining oil mainly lies between the wells in the retention area in front of the fault line of Xin 37 block.The way to develop the remaining oil in retention area effectively is the key element of enhancing the recovery ratio of the extra high water cut oil deposit in the block.According to circumstance,new methods of redirecting the flowing line of water and shifting the water flowing zone is put forward.Moreover,the recovery ratio of the oil deposit,which is in extra high water cut stage,is enhanced though.In order to develop the remaining oil effectively and improve the recovery rate,this paper combines the study of fine geologic research,dynamic analysis,residual oil monitoring,as well as construction of analog digital technology.By fine geologic research,including sedimentary characteristics,physical property as well as the fracture system,the reservoir distribution is clearly analyzed,thus a good foundation for reservoir dynamic analysis is established.By dynamic analysis and monitoring data,the distribution law of residual oil is studied again.By modeling numerical simulation,the quantitative scale of remaining oil scale is studied.According to resident problems in different production layers,numeral measures are put forward to solve them.They are as follows: Inappropriate developed production layers is redeveloped equably by lengthways;Inadequate well networks is replenished by new wells;The residual oil which can not be adequately produced in retention area,is developed by adjusting the flow line of water,or overally adjust production layers.For optimizing the design,the digital simulation method is used to predict the effect.The Xin37 program includes the deployment of 15 new wells,it will contribute to the integration of ground equipment and specialized technology.Furthermore,it will consolidate the altering effects,as well as optimizing the new method.These new wells will contribute to the new production capacity of 23000 tons of oil,the unit daily oil output will increase fifty six tons,and water cut will goes down nine point nine percent.Currently,the increased oil of Xin37 production unit has reached a scale of Twenty-nine thousand and eight hundred tons,making a desired development effect.