E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/12 (2006.01) E21B 43/38 (2006.01)
Patent
CA 2313617
In another embodiment, the closing of the check-valve is accomplished by having the exhaust tubing include a valve which closes at the beginning of a cycle of treatment prior to the over-balancing of the production pressure by the hydrostatic pressure of the produced captured water in the casing's bottom (i.e. before the well is "dead"), such that both the exhaust tubing and the casing's top are sealed; the compressor is actuated and the casing and tubing is pressurized such that the combined pressure of the provided pressurized gas (provided by the compressor at surface) and hydrostatic pressure of captured fluid at the casing's bottom end, exceed the production pressure, thus causing the one-way valve above formation but below the bottom of the exhaust tubing to close; the compressor provides further gas to the sealed casing as desired; the exhaust tubing is opened at the top-end to provide an exit for the captured water, and the well- bore is thus evacuated of water (or significantly evacuated) by the expansion of the provided gas pushing the water up the exhaust tubing and out at surface.
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