E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/25
E21B 21/00 (2006.01) E21B 21/08 (2006.01) E21B 21/10 (2006.01) F16K 47/04 (2006.01) F16K 51/00 (2006.01)
Patent
CA 1105921
CHOKE FOR CONTROLLING THE FLOW OF DRILLING MUD Abstract of the Disclosure The invention concerns a choke for controlling the flow of high pressure drilling lubricant to a drilling bit. In one form, the choke of the present device is an elongate tubular housing having in one end a closure or plug which entraps a fluid operated piston. The piston is made double-acting by applying pressure to both faces controllably. The piston has a centralized plug appended to it which receives thereabout a valve member formed of an extremely hard material. It is located in a circular chamber which communicates with a lateral port where the mud flow from the well is introduced. The lateral port is directed at the valve element which is able to withstand the wear of the flow. The apparatus further includes a circular valve seat which is inserted downstream. The valve seat is also made of hardened material and has a tapered leading edge. It has an edge which matches or mates with the valve element, itself. As the two are brought together, they close off the passage through the choke. The valve seat is a hollow circular ring which communicates with an outlet passage.
343105
Claycomb Jack R.
Kirby Eades Gale Baker
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