The Reasonable Well Spacing Density Determination of Ultra-low Permeability Reservoir——a Case Study of Songshulin-Xinyao Song 700 Wellblock of Nanniwan Oilfield

To determine the reasonable well spacing density is the core content of oilfield development planning.The well spacing density impact the economic results of waterflooding extraction significantly,because oilfield waterflood effect is relevant to the well spacing density and in the total investment of oilfield construction,the drilling costs accounts for a considerable proportion.Based on the case study of Songshulin-Xinyao Song 700 area of Nanniwan oilfield,according to the relationship between recovery percent of reserves and well spacing density and input-output theory,considering the total single well investment,empirical equation could be built to calculate the reasonable well spacing density,thus guiding the ultra-low permeability oilfield well spacing density confirmation.