Study On The Enhanced Liquid Production Experiments In High Water Cut Stage Of Longhupao Oil Field

During the 28 years of development,the Longhupao oil field has experienced the natural energy exploitation stage,commingled water injection stage,layered water injection stage,infill development stage and it has entered the high water cut stage.In order to fully play the main layer capacity,it has conducted several site extraction experiment,but the effect of enhance liquid production in the high water cut stage is not obvious.In order to improve the Longhupao oilfield development effect in high water cut period,it needs to conduct the in-depth study of water flooding mechanism and development rule to the block.In this paper,we use the electron microscope scanning to analysis the micro pore structure of different permeability range of water flooding natural core,use the rate-controlled mercury penetration to study the water flooding natural core's pore and the size and distribution of the throat,use the NMR experiment to study the changes of the rock pore in long-term water flooding situation and remaining oil distribution of different size pores,use the laser confocal to study the type,quantity and distribution of remaining oil at different water cut.Considering the above experimental results,we know the reasons of Longhupao oilfield enhance liquid production weak effect,and has further understanding of the Longhupao oilfield enhance liquid production oil displacement mechanism.By measuring the different permeability range of natural core phase permeability curve,combined with the reservoir engineering method to calculate the corresponding liquid production index,we obtain the core permeability range for the enhance liquid production;through indoor simulation of water flooding enhance liquid production experiments for the reservoir optimal extracting time and displacement velocity.On this basis,the water flooding extraction time and displacement velocity could be adjusted to obtain the best enhance liquid production scheme,effectively control the oil composite decline rate,so as to raise the recovery rate.