Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1991-06-26
1992-03-03
Neuder, William P.
Wells
Valves, closures or changeable restrictors
Fluid operated
166327, E21B 3410
Patent
active
050924060
ABSTRACT:
To significantly reduce voids in cementing fluids and the effects of cement free fall encountered in well cementing operations, a differential pressure control regulator is inserted in series with the bottom of the well casing to be cemented. Fluid passing through the choke portion passes through an annular valve seat to one end of the tool. A valve stem is slidably and sealably mounted in the flow regulator and has a head portion which, in one position, can contact the valve seating surface and prevent any significant flow of fluid through the casing. The valve stem is biased to one position by a trap chamber filled with a fluid at a known pressure, such as atmospheric pressure, or a vacuum, so that the hydrostatic pressure existing at the bottom of the well casing normally urges the valve head into engagement with the valve seat. Increasing the pressure within the casing, as a consequence of pumping cement, forces the valve head away from the valve seat and permits fluid flow only with a positive surface pumping pressure which minimizes the occurrence of voids in the cement.
REFERENCES:
patent: 2161282 (1939-06-01), Crowell
patent: 3385272 (1968-05-01), Knox
patent: 3385370 (1968-05-01), Knox et al.
patent: 3957114 (1976-05-01), Streich
patent: 4270569 (1981-06-01), Reay et al.
patent: 4391328 (1983-07-01), Aumann
patent: 4399871 (1983-08-01), Adkins et al.
patent: 4469174 (1984-09-01), Freeman
patent: 4624316 (1986-11-01), Baldridge et al.
patent: 4712619 (1987-12-01), Stepp et al.
patent: 4771831 (1988-09-01), Pringle et al.
Baker Hughes Incorporated
Neuder William P.
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