Measuring and testing – Fluid pressure gauge – Null balance type
Patent
1978-06-14
1980-03-18
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Null balance type
73744, G01L 716
Patent
active
041933079
ABSTRACT:
An apparatus for indicating at the surface, the subsea well head pressure including; a reservoir, a subsea hydraulic transmitter, a pump to pump hydraulic fluid from reservoir to the subsea hydraulic transmitter, a pressure gauge connected at the surface in the line from the pump to the transmitter, means connecting the transmitter to said reservoir, means for connecting the transmitter to the well head whereby well head pressure is delivered to the transmitter, the transmitter being located on the subsea well head equipment, a flow controlling restrictor connected between the pump and the pressure gauge and the transmitter, the transmitter having a body with a bore at one end and a counterbore at the other end, a piston slidable in said bore and connected to a diaphragm in the counterbore, the piston being exposed to well head pressure, the diaphragm being exposed to pump pressure on one side and to hydrostatic head on the other side with opposite sides of the diaphragm having equal areas to compensate for hydrostatic head, an exhaust valve actuated by the diaphragm to close communication between opposite sides thereof whenever forces from the pump pressure on diaphragm is exceeded by the force on the piston so that the pressure gauge provides a surface indication of well head pressure.
REFERENCES:
patent: 2451451 (1948-10-01), Tate
patent: 2792709 (1957-05-01), Bell et al.
patent: 3084548 (1963-04-01), Copland et al.
patent: 3729997 (1973-05-01), Luke
Baker Gerald S.
Hahn Guerry L.
Cameron Iron Works, Inc.
Woodiel Donald O.
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