PL oilfield

which belongs to the offshore reservoirs with thin interbeds

has long treatment interval and high thin layers. During the development

due to the serious interlaminar interference caused by the commingling production and serious interlayer interference in the earlier stage

the vertical balance level and the overall development effect are poor. In order to improve the oilfield development effects

it is necessary to reorganize the development layer. Firstly

we established the mathematic model of effective judgment of combination series of strata. Then

the chart boards of the relation between the oil price and average accumulative production of single adjustment well

and the relation between the current oil price and the thickness of the minimum layers adjusted by the original oil saturation were established by means of numerical simulation which was based on the characteristics of PL oilfield. Meanwhile

the equation of lower thickness limit of layers was acquired based on the research of correction curve of the influence of development stage

net/gross ratio and mobility difference on the minimum thickness of layers. The application in PL oilfield can make the recovery increased by 6.1 %. This new quantitative way for recombination of series of strata proposed can guide the efficient development of PL oilfield and similar oilfields.