Draw works disabling device for use with a well drilling apparatus

Claim 3

The device of claim 1 wherein said first valve comprises a valve responsive to air pressure and wherein said means for actuating said first valve comprises: an air conveyance conduit connected at one end to said air pressure supply and at the other end to said first valve for actuating said first valve by air pressure; and a second valve connected to said air conveyance conduit for regulating the flow of air in said air conveyance conduit.

Claim 4

The device of claim 2 wherein said second valve is connected to and responsive to said accumulator valve.

Claim 5

The device of claim 3 wherein said second valve is mechanically actuated by an arm mechanically connected to said accumulator valve.

Claim 6

The device of claim 4 wherein said second valve is opened by movement of said accumulator valve to a position for locking said drill string and wherein said first valve is closed when pressurized air is conveyed to said first valve through said air conveyance conduit.

Claim 7

An improved well drilling apparatus of the type which includes a pressurized air supply connected through a draw works valve for actuating the draw works and an accumulator connected through an accumulator valve for supplying hydraulic fluid to a blow out prevention means for locking the drill string against movement, the improvement comprising: a first valve connected for regulating the supply of air from said pressurized air supply to said draw works; and fluid conveyance means for actuating said first valve responsive to the actuation of said accumulator holding said drill string against movement for actuating said first valve, isolating said pressurized air supply from said draw works and preventing the movement of said draw works.

Claim 8

An improved well drilling apparatus of the type which includes a pressurized air supply connected through a draw works valve for actuating the draw works and an accumulator connected through an accumulator valve for supplying hydraulic fluid to a blow out prevention means for locking the drill string against movement, the improvement comprising: a first valve connected for regulating the supply of air from said pressurized air supply to said draw works; and fluid conveyance means for actuating said first valve responsive to the actuation of said accumulator holding said drill string against movement for actuating said first valve, isolating said pressurized air supply from said draw works and preventing the movement of said draw works.

Claim 9

The device of claim 6 wherein said first valve comprises a valve responsive to air pressure and wherein said means for actuating said first valve means comprises: an air conveyance conduit connected at one end to said air pressure supply and at the other end to said first valve for actuating said first valve by air pressure; and a second valve connected to said air conveyance conduit for regulating the flow of air in said air conveyance conduit.

Claim 10

The device of claim 7 wherein said second valve is connected to and responsive to the movement of said accumulator valve.

Claim 11

The device of claim 3 wherein said second valve is mechanically actuated by an arm mechanically connected to said accumulator valve.

Claim 12

The device of claim 9 wherein said second valve is opened by the movement of said accumulator valve to a position for locking said drill string and wherein said first valve is closed when pressurized air is conveyed to said first valve through said air conveyance conduit.

Claim 13

An improved oil well drilling apparatus of the type which includes a pressurizued air supply connected by a draw works air conduit to a draw works which raises and lowers a drill string, a draw works valve disposed on said draw works valve conduit for regulating the supply of pressurized air from said pressurized air supply to said draw works, and an accumulator connected to an accumulator valve for supplying hydraulic fluid to a blow out prevention means for locking the drill string against movement, the improvement comprising: a first valve disposed on said draw works air conduit for regulating the flow of pressurized air from said pressurized air supply to said draw works, said first valve being actuated by air pressure; an air conveyance conduit connected at one end to said pressurized air supply and at the other end to said first valve for actuating said first valve by air pressure; and a second valve connected to said air conveyance conduit for regulating the flow of air in said air conveyance conduit and connected to and responsive to said accumulator valve such that actuation of said accumulator valve to lock said drill string actuates said second valve which, in turn, actuates said first valve and prevents movement of said draw works.

Claim 14

An improved oil well drilling apparatus of the type which includes a pressurizued air supply connected by a draw works air conduit to a draw works which raises and lowers a drill string, a draw works valve disposed on said draw works valve conduit for regulating the supply of pressurized air from said pressurized air supply to said draw works, and an accumulator connected to an accumulator valve for supplying hydraulic fluid to a blow out prevention means for locking the drill string against movement, the improvement comprising: a first valve disposed on said draw works air conduit for regulating the flow of pressurized air from said pressurized air supply to said draw works, said first valve being actuated by air pressure; an air conveyance conduit connected at one end to said pressurized air supply and at the other end to said first valve for actuating said first valve by air pressure; and a second valve connected to said air conveyance conduit for regulating the flow of air in said air conveyance conduit and connected to and responsive to said accumulator valve such that actuation of said accumulator valve to lock said drill string actuates said second valve which, in turn, actuates said first valve and prevents movement of said draw works.

Claim 15

The device of claim 11 wherein said second valve is mechanically actuated by a lever mechanically connected to said accumulator valve.

Claim 16

The device of claim 12 wherein said second valve is opened by the movement of said accumulator valve to a position for locking said drill string and wherein said first valve is closed when pressurized air is conveyed to said first valve through said air conveyance conduit.