Research On The Design Of Water Injection Scheme Of Chang6, Chang8Reservoir In Fuxian

Taking the Chang8reservoir of Ordos Basin in Zhiluo oilfield Jiang Jiachuan block asthe research object, the use of sedimentary petrology, petroleum geology theories, in drilling,well test and data as the basis, system research, the characteristics of stratum structurecharacteristics, sedimentary characteristics and sand body distribution rule, reservoircharacteristics, physical characteristics and the sensitivity analysis and fluid characteristics,through the foundation of geological conditions on the Jiang Jiachuan block and finedescription, design of water injection scheme, and provide reliable basis for water injectiondevelopment and production plan, in order to improve the development level of oil productionplant and enhanced oil recovery.Research thinks: Jiang Jiachuan block the Chang8reservoir low productivity, so the useof waterflooding and production is feasible; according to the evaluation of area of theproduction test efficiency and the surrounding areas of the water injection production testanalysis shows that the region should adopt the advanced water injection; well networkdeployment using rhombus inverted nine spot well network density is19; export/km2;reasonable row spacing100-150m, reasonable well spacing of300-600m; and betting wellinjection pressure shall not be higher than20Mpa; reasonable bottom hole flowing pressure inoil wells in this area is in the range of2.5-4.5Mpa; The largest oil producing pressuredifference is8.5~10.5MPa, if the oil well production is not sufficient to achieve productionrequirements, production pressure difference can enlarge; considering the actual most wellsare producing natural energy development way, think after water injection capacity there isroom for improvement, water after the first year the average single well production capacityshould be greater than the current production first years the average single well productivityfinally, the single well production value of1.55t/d.The last, the present research area actual water situation, get a normal flood periodvariation of average single well daily fluence range is8-10m3/d; the Chang8reservoir thanDong Zhi District, so its water absorption capacity is poor in this area, to determine the reasonable water injection intensity is2m3/d.m, the single Jingchao Eve injection amount is10~15m3/d.