| Checheng Oilfield is located in Nanzhiqiu Town of Xinji,Hebei Province.The development of Checheng Oilfield began in 1997.Checheng Oilfield is the pratical low permeabilily oil reservoir,whose reservoir heterogeneity characteristics is strong,the difference between geological characteristics and physical property of blocks is huge,formation pressure is low and formation energy supplement is insufficient.At present,the Checheng Oilfield is facing declining oil production,slowly rising water cut,the typical contradiction in injection-production.The daily production is declining,and the water cut is still slowly rising.The Checheng Oilfield enters the declining stage of highwater cut of low recovery degree.Many problems are showed after the oil production over years and these problems seriously affect the development effectiveness of the oilfield.Therefore,aiming at better stable oil field production,more study for the oilfield development situation and formulating reasonable comprehensive adjustment scheme has very important significance.Focusing on the existing problem during development,this essay is based on the geologic description and the analysis of characteristics of development,works on the measure adaptability evaluation,numerical simulation and other research techniques,development effect of comparing analysis,then analyze the characteristics of remaining oil distribution.In the development of technology,based on policy research,confirm the reasonable well pattern,well spacing density and injection-production well ratio,optimize the reasonable injection-production relationship,reasonable oil recovery rate.The result of study is working out the program of comprehensive adjustment in Checheng Oilfield to improve the level of reservoir development and ultimate recovery,according to the overall-deployment step-by-step adjustment principle.The program of comprehensive adjustment will be done through the measures of reperforating,water plugging,startup,transferring to water injection well in the oil wells,and measures of profiling control in water wells.Through the study of the comparative study on the numerical simulation and prediction of solution,the effect of oil increase is obvious.So the comprehensive adjustment design can achieve the purpose of improving oilfield development.The essay has not only enriched the experience to develop the Checheng Oilfield,but also played a very important practical significance to Improve the level of development. |
