Research On Optimizing The Water Injection Of Shuanghe Oilfield

Shuanghe oilfield is an oilfield using water injection, through years of development, thedevelopment of oilfield has entered the late, high water cut stage, the difficulty of developmentis increasing.Therefore, to optimize the water injection of Shuanghe oilfield and improve thedevelopment effect, improve the final oil recovery has become one of the most urgent task.This paper takes under Ⅶ formations of Shuanghe oilfield as the research object, usingthe static and dynamic data integrated, establishes the geological model of two periods beforeand after water injection development of the formations,then make the history matching byusing numerical simulation method, analyzes the distribution features of formation pressure,abundance of remaining reserves and remaining oil on the basis of reappearing the process ofreservoir development process.From the result we can acknowledge that the developmenteffect is good in general, because it has a high oil recovery (41.02%) and stress maintenancelevel (95.6%), but individual horizons or zones have a low maintenance level as a result ofthere is no water injection or imperfect injection-production relationship.Researches theinjection strategy at the high water-cut development period. Abundance of remaining reservesare scattered and patchy distribution in different parts of the sand body,the value of remainingreserves abundance in main layer is high,while non-main layer is low. Remaining oil is mainlydistributed in the area of incomplete flood pattern, reservoir boundary and between the oilwells can not be swept by injected water, remaining oil saturation in main layer is low,the highremaining oil saturation are mainly distributed in the non-main layer. At last we study andoptimize the reasonable parameters such as water injection strength, fluid producing intensity,injection-production ratio, injection multiples, then put forward a series of measures tocomplete flood pattern and demonstrates its feasibility, make guidance to the next step foroilfield development adjustment and improve oil recovery.