Fracturing technology by ball dropping sliding sleeve outside casing

Due to the fact the conventional fracturing technology cannot fracture the long horizontal section in open-hole completed horizontal well, which severely restricts the large-scale development of unconventional oil and gas, research was carried out on fracturing technology by ball dropping sliding sleeve outside the casing. A series of tools like K342-142 fracturing packer, PS70-140 pressure difference sliding sleeve, BS70-140 ball dropping sliding sleeve and QZ-130 setting ball seat were developed, and a multi-stage fracturing technical string applicable to He’nan Oilfield was generated, which is suitable for tight sandstone fracturing and satisfies the need for rapid development of unconventional resources.