Development of openhole staged fracturing key tools in horizontal well

Openhole staged fracturing technology of horizontal well is an effective mean for unconventional oil gas reservoir development. Besides, openhole multistage fracturing tools need design improvement, parameter enhancement and reliability intensification. Expandable liner hanger deploys mental particles auxiliary rubber suspension. Laboratory test results reveal that the holding weight of 114.3 mm hanger could increases 10 t, and hydraulic mechanical dual release plan improves the safety of fracturing process. The annulus pressure of openhole packer in size 114.3 mm with expandable metal ring is 30 MPa higher than packer without ring. Openhole packers with 2 rubber tube could hold annulus pressure up to 60 MPa while more elements packers increase annulus sealing ability slightly. Inner cone hardness of sliding sleeve after laser surface processing arises to HRC55. Indoor test data of fracturing string qualifies its capability of meeting the requirements of construction site. Fracturing tools get success in two wells of low-permeability district with 10 stages, 11 stages fracturing job separately. 5260 tons oil collects from the two wells in total after production. Field application represents that new openhole multistage fracturing tools have excellent properties and security and stability in actual usage.