초록 ▼

A blowout preventer having a mechanical linkage to a valve connected to a pressure relief line in the casing beneath the blowout preventer whereby the valve on the pressure relief line is opened when the blowout preventer is actuated is disclosed. The blowout preventer includes an upright tubular bo

A blowout preventer having a mechanical linkage to a valve connected to a pressure relief line in the casing beneath the blowout preventer whereby the valve on the pressure relief line is opened when the blowout preventer is actuated is disclosed. The blowout preventer includes an upright tubular body having an annular packing therein which can be constructed about a drill pipe or other pipe in the well, a head connected to the top of the upright tubular body for containing the annular packing in the body, a piston slidably received in the body and adapted to selectively constrict the packing about the well pipe, a casing pipe connected to the lower end of the body for containing the well pipe, a pressure relief line connected to the casing having a valve therein, and a rod connected to the piston and the valve to open the valve when the piston slides within the tubular body to constrict the packing about the well pipe.

대표청구항 ▼

1. A blowout preventor for use on a well comprising: a. a body member adapted for containing a well pipe and means for selectively preventing fluid from the bottom of the well pipe through said body members; b. a casing connected to the bottom of the body means, said casing having a pressure rel

1. A blowout preventor for use on a well comprising: a. a body member adapted for containing a well pipe and means for selectively preventing fluid from the bottom of the well pipe through said body members; b. a casing connected to the bottom of the body means, said casing having a pressure relief line connected thereto, said pressure relief line comprising a pipe connected to said casing for diverting fluids contained in said casing to a location remote from said casing having a valve therein; and c. means for mechanically linking said valve to said means for selectively preventing fluid from the bottom of the well from flowing around the outside of the well through said body member so that said valve is opened when the flow of fluids around the outside of the well pipe through said body member is prevented. 2. The blowout preventer of claim 1 wherein said valve is a gate valve. 3. The blowout preventer of claim 1 wherein said means for selectively preventing fluid from the bottom of the well from flowing around the outside of the well pipe comprises a packing means and a piston means slidable upwardly and downwardly about said well pipe which can compress said packing means around the outside of said well pipe to prevent the flow of fluids around the outside of said well pipe upwardly through said body member. 4. The blowout preventer of claim 3 wherein rod means is connected to said piston means and to said valve means for opening said valve means when said piston means compresses said packing means. 5. A blowout preventer for use on a well comprising: a. an upright tubular body means adapted to receive an annular packing means to be constricted about a well pipe; b. an annular packing means located in said body means; c. a head means connected to the top of said body means for containing said packing means in said body means; d. piston means slidably received in said body means adapted to selectively constrict said packing means about a well pipe extending through said body means; e. casing pipe means connected to the lower end of said body means; f. diverter pipe means connected to said casing pipe means for diverting fluids contained in said casing to a location remote from said casing pipe means; g. valve means connected to said diverter pipe means; and h. rod means connected to said piston means to open said valve means when said piston means constricts said packing means. 6. The blowout preventer of claim 5 wherein said valve means is a gate valve. 7. The blowout preventer of claim 5 wherein said body means contains means for selectively forcing said piston means against said packing means to constrict said packing means around said well pipe. 8. The blowout preventer of claim 7 wherein said head means has a cylindrical hole in the top thereof through which said well pipe is received. 9. A method for preventing blowouts in a well comprising: a. attaching a blowout preventer having a movable flow restricting means therein to a well casing pipe; b. connecting a pressure relief pipe to the casing pipe between the blowout preventer and the bottom of the well, said pressure relief line having a valve therein; and c. mechanically linking said movable internal flow restricting means of the blowout preventer to said valve so that said valve is opened when said blowout preventer is actuated.