The Research On The Adjustment Of Development Measures Of Baihe Oil Field Chang 6 Reservior

Baihe oilfield belongs to the extra low porosity and ultra low permeability reservoir,after 6 years of production and development.At present,it appears some phenomena like part of wells in a low yield,high water content andthe efficiency of water injection is low.In order to improve the development effect and the production.It needs to combine with the characteristic of Geology,the development of reservoir and the measures of effective to adjust and optimize the measures,which are taken to the Chang 6 reservoir.Based on the production status,combined with geological characteristics,analysis respectively from the production,water content,pressure,and to evaluate the effect of development,it reveals the reasons which are lead to some wells low production,high water content and the poor degree of well connection.Combined with the geological characteristicsandthe reservoir engineering method to adjust the measures,which are takento the Chang 6 reservoir,and provide the theoretical basis for the latter part of high efficient development.The results and understanding of this research are mainly about the five following points:(1)The main reasons for the low productivity of some wells are the formation energy is low,the low oil saturation and the high water content.(2)The main reasons that lead to increase the water-content are the strength of water injection,the development of micro cracks and the high water content.(3)The types of oil well can be divided into the following three categories in the producing the desired results:the effective obvious type,the stable type and the water breakthrough type,which are respectively account for 60%,20%and 20%.The degree of effectiveness is 58.8%,and the efficiency is low.(4)The control degree of water displacement is relatively good,the producing degree of reserves is 32.8%,so the effection of the water displacement is poor.(5)The optimal well type in study area is the inverted nine-spot injection pattem,reasonable well space is 240m,the reasonable density is 19 well/km2,the minimum flow pressure of the bottom hole is 2.62MPa,the maxmum pressure of the wellhead injection is production and the injection is 1.2,and the reasonable intensity of production is 0.69%.