Application for stepwise fracturing technology of horizontal well in Niujuanhu Oilield

No mature practice of stepwise fracturing for horizontal well can be used for reference at present. Since there exists a low-porosity and low permeability reservoir with low pressure and low productivity well in Niuquanhu oil ield, the research has been carried out about stepwise fracturing technology of horizontal well. The paper presents the method, matching tools and luid system of fracturing. A successful on site test had been experimented by stepwise fracturing technology of horizontal well utilizing K341-98 packer + bridge plug and matching technologies. The result shows that the application of fracturing technology for Niuquanhu low permeability reservoir is well achieved because of compatibility of K341-98 packer method and fracturing luid system and reasonable construction parameters. The oil is effectively produced since individual well producing rate increased from zero to triple rate of vertical well. The fracturing technology provides valid experiences for similar domestic oil ield.