Numerical Simulation Study On Water Injection Parameters Adjustment In M Block Of Aoilfield

M block of A oilfield is located in the center of the horst structure,which is in the southwest edge of Alskum sag.By December 2017,oil production of this block decreased clearly and water cut rose quickly.As the result the comprehensive water content reached66%.With the 30 years water flooding development,the distribution of fluid in reservoir was increasingly complex and the contradiction of horizontal and vertical inconsistency in reservoir aggravated gradually.In order to producing remaining oil further and to obtain a higher oil recovery,numerical simulation research on water injection parameters adjustment in M block of A Oilfield has been carried out in this paper.At first,the research status at home and abroad of relevant technical measures for development research of some oilfield,which likes this block,has been fully investigated.Then a three-dimensional fine geological model had been established by Petrel geological modeling software and a reservoir numerical model of the research area had been established by Eclipse numerical simulation software under the foundation that the geological characteristics and production performance of M block has been deepen the realized.After that,history matching had been finished and the reservoir parameters had been further corrected in this process.In the end,different types and the causes of residual oil had been analyzed.The distribution regularity of residual oil in each layer and in different sedimentary units had been analyzed after historical matching,which lays foundation for further research on adjustment of water injection measures and producing remaining oil further.In combination with the actual development of the reservoir,producing remaining oil measures for different types of it and the method for adjusting the injection wells has been studied.Then the statistical empirical formulas,theoretical research formulas and numerical simulation methods has been used to study the relevant adjustment indexes,such as injection-production ratio,oil production rate and injection quantity.After that,the principle of fracturing well selection and fracturing stratum selection has been determined.Finally,a comprehensive adjustment program has been brought forward.It was found that the accumulated oil production in the comprehensive adjustment program for the research area was 55.31×104t,which was 2.55×104t higher than the original program,and the initial water content decreased significantly by numerical simulation calculations.The results of this research has certain value for further producing remaining oil and improving reservoir development in M Block of A Oilfield.