Fluid handling – With holder for solid – flaky or pulverized material to be...
Patent
1979-03-23
1981-07-28
Leppink, James A.
Fluid handling
With holder for solid, flaky or pulverized material to be...
166318, 166319, 175107, 137508, E21B 312, E21B 4100
Patent
active
042805244
ABSTRACT:
A fluid pressure actuated by-pass and relief valve are utilized in a fluid pressure actuated downhole drilling apparatus. The valve is normally closed such that fluid under pressure is directed between a rotor and a stator to rotate a drill bit. When the fluid pressure reaches a predetermined value, the valve is actuated to direct the flow to the hollow interior of the rotor to protect the rotor and the stator from damage due to excessive torque loading. The relief valve is of the sleeve type which can become stuck in the open position due to contaminents in the fluid. In the open position, the pressure drop across the valve will be insufficient to close the valve and the drill bit will not be rotated. A screen is positioned between the outlet of the valve and the interior of the rotor. The screen is then plugged by dropping pieces of plugging material, such as small chips of rubber, down the drill pipe to collect in the screen. A partially plugged screen will create a pressure drop which can cause the valve to close. A fully plugged screen will function as a closed valve.
REFERENCES:
patent: 2192945 (1940-03-01), Toney
patent: 2565742 (1951-08-01), Sailers
patent: 2839078 (1958-06-01), Lornitzo
patent: 2879032 (1959-03-01), Whittle
patent: 3011559 (1961-12-01), Muse et al.
patent: 3032050 (1962-05-01), Clark, Jr.
Baker International Corporation
Leppink James A.
Norvell, Jr. William C.
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