Analysis of Development Effect of Water Flooding and Carbon Dioxide Flooding in Block A

Abstract

AbstractImproving the oil production rate and recovery ratio is a difficult problem in the development of low-permeability oilfields. Low-permeability oilfields generally have low natural energy, high permeability resistance, fast energy consumption, rapid pressure drop, and large output decline. The ultra-low permeability reservoir, S Oilfield, Block A was put into production in 2005, and the water injection pressure was very high at the beginning in this block. By 2011, most water wells could only be injected intermittently. Since 2011, active gas injection has been carried out successively to 6 water injection wells in the northern part of the block, which have initially seen good development results. In 2015, the area launched an industrial test of carbon dioxide flooding. This paper analyzes the oil displacement effect of water flooding stage, the carbon dioxide flooding stage which is active gas injection flooding and the industrialization test stage. Starting from the carbon dioxide flooding mechanism, block injection conditions, injection well pattern design, injection parameter optimization, etc., analyzes the carbon dioxide flooding effect of Block A. KeywordsUltra-low permeability reservoirWater floodingCarbon dioxide floodingOil displacement effect analysis