Evaluation Methods For Determining Formation Pressure In Extra High Water Cut Stage And The Separate Layer Pressure Testing Technology Research

The current method to evaluate formation pressure in Daqing oil field is according to the average pressure which is the well testing interpretation arithmetic average pressure of the oil well.Because low permeability and ultra-low permeability reservoirs have poor reservoir properties,low permeability,large seepage resistance and flow difficult,well testing curves show complex shapes,which make larger uncertainty between well testing interpretation model selection and explanation.At the same time the results can not describe reservoir and development dynamic characteristics well,it can not reflect the actual stress levels correctly.This paper analyzes the relationship between formation pressure and injection to producing well ratio,injection-production ratio and other development index,studies the influence of different development index affected on formation pressure by using numerical simulation technique.The relationship between oil and water wells formation pressure is clear through analyzing the influence factors of pressure difference between oil and water wells.The fact that oil and water wells pressure data is very important to evaluate the formation pressure is determined,the method which is used to evaluate the formation pressure level is formed by using the data of oil production wells and water injection wells.The structure of sealing pressure gauge is appropriately designed,combined with the structure of 665-2 type and 665-6 type eccentric water distribution pipe string subject plug slant hole.At the same time separate layer pressure monitoring is developed,pressure difference of each interval is analyzed,the formation pressure related to the oil production wells is determined.Evaluation methods for determining formation pressure in extra high water cut stage and the separate layer pressure testing technology research,make up for the deficiency of the current general pressure,and it can reflect single layer data more truly,provide detailed data basis for implementation of injection-production system adjustment,casing damage cause analysis,producing residual oil and other work.