Application Number: 00102940
Application Date: 2000.03.16
Publication Number: 1272586
Publication Date: 2000.11.08
Priority Information:
International: E21B33/12
Applicant(s) Name: Liu Jianhang
Address:
Inventor(s) Name: Liu Jianhang
Patent Agency Code: 00000
Patent Agent:
Abstract The invented multi-functional bottom valve is a new type blowout prevention operation tool, when the well is being in normal production, it can be substituted for fixed valve, and when the pumping rod is parted, it can prevent blowout of well under the heavy load of the pumping rod, and in the course of operation production, it can safely open channel to implement several operations of oil discharge and sand removal, and at the same time it can safety prevent well blowout, and when the rod job is implemented, it can make snubbing service.