Study On Optimization Of Gas Injection Development Of XingGu-nine Block

The buried hill reservoir of xinglongtai-hing ancient 9 was buried deep in the reservoir,the pore throat was small,the heterogeneity was serious,the initial water saturation was high,the reservoir sensitivity was strong,etc.As well as the limitation of the fine filtration of process technology and the difficult realization of layered water injection,the overall development effect is not satisfactory,and the recovery rate is low.Efficient and reasonable oil recovery method is adopted to avoid the underground mining and water injection energy shortage,energy depletion of the recovery factor of oilfield is stable and reasonable,has an important practical significance for the development of the scene.But xinglong station-hing ancient buried hill reservoir of the existence of 9 main contradiction is high water injection pressure,injection into,formation energy shortage and cannot get effective supplement,the result to be particularly fast formation pressure decline;In this way,the contradiction between the "injection-infusions" and the "non-production" layer is more prominent.Such block major contradictions,to find more reasonable way of development,it is very important,to block the need of development and stable yield,gas injection development is the most appropriate for the blocks.And the advantages of gas injection development is either water control oil,and can achieve the purpose of waterflood development complement formation energy,can also be stable to improve oil recovery,this can be very effective to develop the reservoir of block.Gas displacement method for the injected gas is different,its oil displacement mechanism and the effect it have bigger difference,there is no doubt that carbon dioxide miscible flooding and the hydrocarbon gas injection miscible flooding effect is best,but the lack of resources limits the application of these methods in liaohe oilfield and promotion.Appeared in recent years,the advantages of nitrogen flooding,the oil displacement mode is mainly to nitrogen and nitrogen making way is simpler,more raw material sources,making low cost,no toxic to the environment without any pollution,these are other ways of oil displacement without the advantages of the unique advantages of nitrogen flooding development swift and violent development,has become the key technology of the development of gas injection,and the nitrogen gas flooding in low permeability reservoirs and condensate gas reservoir water flooding development effect is not obvious reservoir has achieved preliminary results.Therefore,this article mainly in xinglong station-hing ancient buried hill reservoir 9 development present situation and the feasibility of nitrogen gas and oil displacement mechanism is analyzed,through research,physical simulation experiment results,the existing gas injection scheme is optimized.The higher recovery rate was obtained by the combination of air and water injection,cyclic gas injection and cyclic waterflooding.When nitrogen flooding is carried out,the injection of carbon dioxide gas slug can greatly improve the effect of nitrogen flooding if conditions permit.It is of great significance to improve the development effect and recovery efficiency and promote the sustainable development of liaohe oilfield.