Study On The Development Technique Of Multilayer Reservoir

The paper reviews the technical difficulties of multilayer reservoir development and some problems in current research.The paper also illustrates the structure,sedimentary and reservoir geological characteristics of-the research area YingDong 1 oil field,the multilayer complex fault block oil field,which provides geological knowledge and foundation for the research area development.In key part,first,the paper studies the multilayer reservoir strata division and combination in quantitative standard.The lowest limit of the reserves abundance,effective thickness,the maximum span between layer,the combination technology boundaries of viscosity,permeability and porosity is obtained by theoretical derivation.In combination technology boundaries section,innovatively using six layers without crossflow model,which is oil-water two phase constant pressure displacement.Water breakthrough time in each layer is analyzed,and geting a concise and practical comprehensive quantitative division standard.And by using the level classification principles and quantitative standard,Yingdong 1 oilfield formation is divided,thereby it provides reference for similar reservoir strata division in theory and practice.Second,the paper studies the well spacing density of the multilayer reservoir,which contains the technology reasonable density method,the economic and reasonable well pattern density method,reservoir analogy method.In the technology reasonable density method,this paper expounds a given production method,well pattern control method and the degree of water flooding control method;In the economic and reasonable well pattern density method,this paper expounds five kinds of economic limit well pattern density method,one kind of the optimal economic well spacing density method and one kind of practical well spacing density method.The reservoir analogy method adopts the well spacing density of inultilayer fault Bohai bay oil field and the Qinghai oil field.Using three methods,reasonable well spacing in the reseach area is obtained,which is 200 m.In the well pattern section,preliminary considering the anti-nine and the anti-seven well networks,each combining with the well spacing of 150m,200m and 280m.Third,the single well productivity of multilayer reservoir is studied.Two layers capacity formula and multilayer capacity formula was deduced and then production strength and rice productivity index are calculated by formation test and production test data.And IPR curve is used to get the reasonable production pressure difference,finally reasonable single well production capacity,which is 6-8 t/d,is calculated.At last,plan optimization in the study area is carried on.By numerical simulation method and estimate method,the production index of each scheme in 20 years later is got.By making Comparison among accumulative total recovery ratio,moisture content and well pattern adjustment factors,the anti-nine well network and 200 m well spacing are selected.