Study On Adjustment Criterion Limit Of Strata Series For BL Long-span Multilayer Oilfield

With regard to those long-span multilayer offshore oil reservoirs adopting the multilayer commingled production development pattern,a series of defects would expose gradually owing to the rapid development.Consequently,adjustment of strata has become an significant measure to improve such reservoirs' recovery efficiency.Based on the appropriate understanding of current development situation,level and key factors related to efficient development,verifying policy recombination limits of strata as well as establishing suitable adjustment plans for BL oilfield are of great significance.According to the current development situation and existing problems of BL oilfield,this article has accomplished the following work and obtained the corresponding results:(1)Analyzed the geologic and development characteristics,which became the foundation for the subsequent work.(2)Taking advantage of series of dynamic methods,this paper calculated and analyzed the possible recovery of current developing plans,utilizing of analogy,empirical formula and numerical simulation method,this paper has confirmed that target reservoirs have the potential of 10%higher recovery;selecting indices including well network perfect condition index?water flood status index?output and storage conditions index and moisture status index,this article has evaluated the development effects as well as analyzing the existing issues;moreover,this paper has ascertained adjustment direction for achieving the aim of 10%higher recovery.(3)On the basis of fully understanding the key factors affecting development efficiency of BL oilfield,this paper has established the mechanism model which was coincident with the oilfield geological characteristics as well as carrying out systematic mathematical research for the strata recombination parameter limits.(4)This paper has established new research for strata recombination of long-span multilayer offshore oil reservoirs through studying the related oilfield engineering knowledge and economic parameters..Furthermore,standard of lower limit of strata adjustment as well as the related correction charts have been systematically studied.Strata recombination parameter limits haven been confirmed.(5)With the established strata series combination limits policy as well as the related correction charts,this paper has recombined the strata and optimizated the well patterns.Furthermore,it has analyzed and indicated the improve situation after the adjustment.Indications illustrated that new adjustment plans are valid and that the obtained standard of lower limit of strata adjustment as well as the related correction charts are exactitude.