E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/42
E21B 43/12 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01)
Patent
CA 1094948
ABSTRACT Disclosed is an apparatus and its method of oper- ation for an oil well valve having a self adjusting liquid spring responsive to changes in pressure in the well annulus. The valve has liquid spring contained in a spring chamber divided by a piston means which moves responsive to annulus pressure changes to oper- ate the valve. The piston means includes a metering means to meter liquid from one side of the piston to the other as the volume of the liquid changes due to pressure and temperature changes. The piston means moves responsive to pressure changes in the well annu- lus which pressure changes are applied to the well annulus at a rate faster than the metering means may relieve the changes. A mechanical spring means in con- junction with the metering means returns the piston means to its original position after a predetermined time. By- pass means is additionally disclosed which bypasses the metering means and may be arranged such that piston means movement occurs on either pressure increases or pressure decreases in the well annulus.
313292
Gonzalez Floyd A.
Williamson Jim R.
Company Halliburton
Swabey Ogilvy Renault
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