Research On Waterflood Comprehensive Adjustment Of Lotus Strata In Leijia Block

Lei Jia old lotus reservoir is a thin interbedded sandstones with low permeability andcomplex fault block oil reservoir with bottom water, oil bearing area2.42Square kilometre,Geological reserves of3850000tons,calibration recovery29.3%, put into production in1987,2004with water, Current annual production capacity of70000tons, PetroChina Liaoheoilfield high rise is one of the main production plant development unit, in recent years by thecharacteristics of reservoir geology and into the influence of high water cut stage,the bottomwater coning is serious, with a layer of large section of commingled injection and productionof plane, vertical injection contradiction, poor development effect, the scale ofproductioncontinued to decline, not up to the calibration recovery.The fine reservoir geological characteristics from the description, in-depth study of thegeologicalstratification, structure, sedimentation, reservoir and geological reserves,recognizing the objectivelayer of Lianhua oil layer can be divided into4groups of13sets ofsandstone layers, structures for the fault anticline, fault nose and monoclinic, with goodsuccession, as a deep freshwater lakeenvironment of fan delta depositional system, reservoirwas dominated by sand conglomerate,average porosity is19.4%, average permeability125.02Millidarcy, belongs to medium porosity, low permeability reservoir, reservoir heterogeneity,Recount reserves6273000tons. On this basis, thedevelopment history and developmentstages, divided into sandstone group to carry out research on Evaluation of reservoirdevelopment effect and remaining oil distribution, proposes the hierarchical development toimprove the injection production system, work to further improve the water floodingrecovery,and has conducted the research and development and deployment of newdeploymentadjustment, adjustment of20wells after the implementation of new crude oilproduction capacity, After the implementation of new crude oil production capacity of52000tons is expected, improve the recovery rate of10.2%.