Well pattern reconstruction method and device for water injection development old oilfield

Abstract

The invention discloses a well pattern rebuilding method and device for the water-injection development of an old oil field. The method comprises the steps that various factors for influencing well pattern arrangement are taken into account, and mesh parameter data in geologic modeling and numerical reservoir simulation computed results are stacked and computed to obtain parameter distribution of series of strata; the mesh comprehensive evaluation index of the series of strata is computed, and a comprehensive evaluation index distribution diagram of the series of strata is obtained; well patterns are arranged on the comprehensive evaluation index distribution diagram of the series of strata according to different well pattern types, well positions are adjusted according to the characteristics of the comprehensive evaluation index distribution diagram, and initial well pattern arrangement schemes are obtained; for each initial well pattern arrangement scheme, old wells are searched for around the signal wells, and whether the oil wells are utilized is determined according to well conditions and an injection-production relationship; each well pattern arrangement scheme formed finally is evaluated, and the relatively-optimal well pattern arrangement scheme is selected according to the well pattern control degree and a recovery efficiency index. The well pattern rebuilding method and device for the water-injection development of the old oil field can meet the well pattern arrangement requirements of old oil fields in the secondary development process.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method and a device for rebuilding well patterns in old oilfields for water injection development. Background technique [0002] my country's oilfield development has entered the stage of high water cut development. The mining history of many oil fields has reached several decades, and detailed geological data and production data have been accumulated. In 2007, PetroChina formally proposed the secondary development project of the old oilfield, which determined the "triple" technical route of reconstructing the underground understanding system, rebuilding the well pattern structure, and reorganizing the surface process flow. Among them, reconstruction of well pattern structure refers to layer division and well pattern reorganization technology with single sand body as a unit on the basis of reconstruction of underground understanding system. The basic content cover...

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Problems solved by technology

Due to the long history of oilfield development, the reservoir has been repeatedly scoured, forming a lot of water flow advantage channels, interlayer interference and single-layer breakthrough phenomenon are serious, the development effect is poor, the old well casing is changed and the casing damage is serious, and the original well pattern can no longer be effectively controlled. remaining reserves in the ground

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