Research On Exploitation Potential And Adjustment Of Injection-production Relationship In Block 3 Of Xinmiao Oilfield

Miao 3 oilfield is faced with many problems:the marker of stratigraphic correlation around the developed working block is unclear,the study of sedimentary facies and sand body is not in-depth enough,the formation energy is insufficient and the water injection development effect is poor,the reservoir permeability and the oil well productivity is low,the production is difficult,and the development benefit is poor.Aiming at the problem of unclear stratigraphic correlation.Using 3D seismic data and drilling completion data,interwell stratigraphic correlation is carried out by means of typical correlation markers and sedimentary cycle control.Three-dimensional seismic data are used for constrained correction in areas with complex fault zones and unclear stratigraphic correlation marks.The oil group is Fuyu and Yangdachengzi oil group.The main purpose of this study is the Fuyu Group.There are altogether 4 sand beds and13 stratigraphics.The interval of interest for Miao 3 oilfield are mainly meandering stream deposit.The main sedimentary microfacies are distributary channel,Flood land sheet sand,flood plain swamp,flood plain lake,natural dyke and crevasse splay micro facies.I sand group shallow lake facies develop distributary channel,sheet sand,distributary flume bay and natural levee micro facies.Oilfield well pattern control is low.More than half of the reserves are uncontrolled or incompletely controlled.This part of reserves is low in abundance and low produc-tivity of oil wells.Reserves are not available under current economic and technological conditions.Water drive in injection-production perfect area is low.The current well pattern can not fully adapt to the geological conditions of oilfields.Oil and water wells located in the direction of distributary channel and fracture development.It's easy to sudden water flooding in injection-production process.However,well spacing is greater than technical injection-production well spacing in low-permeability.Oil wells are ineffective.Economic well spacing in oilfields is 150m.Technical well spacing is 70¹20m.Currently deployed well pattern is diamond pattern 150×500m.As a result,the disad-vantage of technical well spacing greater than economic well spacing appears.Well pattern deployment and injection-production adjustment can not be fully carried out in the study area.Only some favorable areas can be selected for adjustment and improve-ment.Oilfield development potential can be divided into three categories.Unused reserve potential,adjusting and perfecting potential and fracturing improving productivity potential.Under the current economic and technological conditions,the unused reserves area has no economic exploitation value.Developed zones have certain potential for readjustment and improvement.This deployment of vertical and horizontal wells.Well area with poor water injection development effect.Increasing injection wells by converted production oil injection wells and deploying water wells.Perfecting injection-production relationship in these wells.CO₂ gas energized fracturing or network hydrau-lic fracturing measures for oil wells in injection-production perfect area.Improving productivity of old oil wells.Water injection development zone with perfect injection-production well pattern.Utilizing the latest geological and reservoir research results.Deployment of prefect well and deployment adjustment well.The well pattern controls degree and reserve utilizetion degree are improved.Fracturing can improve the productivity of old Wells.