Evaluation Of Reservoir Development Effect By Water Injection Of Chang 6 Formation In City Zone Of Wayaobao Oillfield

During the development of urban area of Wayaobao oil field,no water-injecting measurement had ever been done,and the filed pattern was not well enough, it caused the recovery only 4.47%,which was far from the normal development level,so it is very necessory to adjust the injection restructionsBasing on the real situation of the researching area.,this paper analysed the geological and reservior characteristics of the Chang 6 layer in Yanchang member,and finished the research of effective evaluation of water injection,the results are shown as follows:1. Through the formation-reservior division and sand distribution charactristic research, the Chang 6 of Yanchang member was fine divided,it was divided in to four sublayer,Chang 61?Chang62?Chang63?Chang64.The sands of layers were of zonal distribution.large thickness,and fine reservior properties.as the main producting layer,Chang 61layer was further divided in to Chang 61-1?Chang 61-22. Through the discription of lithology characteristic?distribution of pore and throat? heterogeneity of formation and the fraction growth,the formation characteristic analysis was done.The reservior fluid property was known by doing the analysis of fluid flow.3. By establishing right logging explanation model,and chosing proper reserve calculating methods,the reserve parameters were accuratly calculated.Basing on this,the geological reserve of Chang 6 member was 311.36×104t (408.67×104m3).and the oil bearing area was 14.94km2.the final recovery was 20.43%.4. The reservior enginering demonstration was finshed by doing the research of development status, layer series and development mode.The water-injection development indexes were evaluated,such as reasonable well spacing density?reasonable well spacing reasonable formation pressure level?reasonable injection pressure?reasonable injection volume?reasonable injecting and producting well ratio and reasonable liquid and oil producting rate,et al.5. Through the analysis of injection struction for present well pattern,doing the infill well pattern adjustment,the coMPared and predicted result showed that by adjusting the injection pattern,the cumulative oil output of 20 years later will be 34.98×104t,and the recovery will be 10.12%,water content will be 89.02%,the economic benefit will achievel 86.30 million.