Coker unit drilling equipment
First Claim
1. In a drilling operation including a drill stem, a drilling assembly on the end of the drill stem and including a downwardly directed pilot nozzle for drilling a vertical pilot hole and an outwardly directed full hole nozzle for enlarging the pilot hole and a pump for delivering high pressure fluid to the nozzle, the improvement comprising means responsive to stopping high pressure fluid flow to the drill stem and then restarting high pressure fluid flow to the drill stem for shifting fluid flow from the pilot nozzle to the full hole nozzle and includinga housing providing a fluid inlet and a fluid outlet having a first passage to the pilot nozzle and a second passage to the full hole nozzle,a diverter valve body in the housing shiftable between a first position connecting the fluid inlet to the first passage and a second position connecting the fluid inlet to the second passage, andmeans mounting the diverter valve body for movement between the first and second positions in response to stopping high pressure fluid flow to the drill stem and then restarting high pressure fluid flow to the drill stem.
1 Assignment
0 Petitions
Accused Products
Abstract
In a petroleum coke operation, a pilot hole is drilled in the coke by high pressure water emitting from downwardly directed nozzles in a drilling assembly. A full hole is eroded in the coke by diverting the high pressure water to a series of full hole nozzles in response to shutting off, and then resupplying, high pressure water to the drilling assembly. This conveniently converts pilot hole operations to full hole operations, which is the normal mode of cutting coke from a drum. Thus, the modes of operation are switched each time water is resupplied to the drilling assembly.
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Citations
15 Claims
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1. In a drilling operation including a drill stem, a drilling assembly on the end of the drill stem and including a downwardly directed pilot nozzle for drilling a vertical pilot hole and an outwardly directed full hole nozzle for enlarging the pilot hole and a pump for delivering high pressure fluid to the nozzle, the improvement comprising means responsive to stopping high pressure fluid flow to the drill stem and then restarting high pressure fluid flow to the drill stem for shifting fluid flow from the pilot nozzle to the full hole nozzle and including
a housing providing a fluid inlet and a fluid outlet having a first passage to the pilot nozzle and a second passage to the full hole nozzle, a diverter valve body in the housing shiftable between a first position connecting the fluid inlet to the first passage and a second position connecting the fluid inlet to the second passage, and means mounting the diverter valve body for movement between the first and second positions in response to stopping high pressure fluid flow to the drill stem and then restarting high pressure fluid flow to the drill stem.
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7. In a drilling operation including a drill stem, a drilling assembly on the end of the drill stem and including a downwardly directed pilot nozzle for drilling a vertical pilot hole and an outwardly directed full hole nozzle for enlarging the pilot hole, the improvement comprising means responsive to fluid flow in the drill stem for shifting fluid flow from the pilot nozzle to the full hole nozzle and for shifting fluid flow from the full hole nozzle to the pilot nozzle, the fluid flow responsive means comprising a diverter valve having a
a housing providing an outlet end having a first passage to the pilot nozzle and a second passage to the full hole nozzle, and a main fluid inlet, a valve body in the housing having a main fluid passage extending from the outlet end toward the inlet, means mounting the diverter valve for axial movement toward the outlet end in response to fluid flow toward the drilling assembly, and means mounting the diverter valve for rotational movement between a first lowermost position connecting the main fluid passage to the pilot hole nozzle and a second lowermost position connecting the main fluid passage to the full hole nozzle.
Specification