Study on Water Injection in Horizontal Wells of Low Permeability Reservoir (I)

The technology of horizontal well injection has greater advantage to exploit low permeability reservoir, it has an important economic and engineering significance to design a reasonable horizontal well and calculate it´s production capacity correctly for enhancing oil recover efficiency. The sandstone model of low permeability reservoir was designed. Based on this model, affects of horizontal length, well spacing, well location and injection directions were studied. The factors that impacted oil recovery efficiency with horizontal well injection were studied. Compared with vertical injection pattern, horizontal injection pattern can form linear drive to put off water breakthrough, improve recovery and show slow rise in moisture content at the same pressure and time. The oil recovery of the reverse staggered was significantly higher than the Parallel co-rotating at the same pressure, it can put off the water breakthrough time and it´s moisture content is much smaller than the Parallel co-rotating.