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A water stream is treated to remove oxygen before injecting the water into an underground hydrocarbon reservoir. The water-oxygen mixture is separated by centrifugal action using fixed spin blades (20). Oxygen is removed from the center of the conduit through a gas pipe (30) coupled to a vacuum pump

A water stream is treated to remove oxygen before injecting the water into an underground hydrocarbon reservoir. The water-oxygen mixture is separated by centrifugal action using fixed spin blades (20). Oxygen is removed from the center of the conduit through a gas pipe (30) coupled to a vacuum pump (50). Nitrogen may be introduced upstream of the centrifuge to dilute the water-gas solution to improve the efficiency of the gas-liquid separation.

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What is claimed is: 1. A method for treating a water-gas combination wherein the gas includes oxygen and is dissolved in the water, to obtain water with a minimum percent of the oxygen, comprising: maintaining a vacuum in a first conduit at a centrifuge that lies in the first conduit, and passing t

What is claimed is: 1. A method for treating a water-gas combination wherein the gas includes oxygen and is dissolved in the water, to obtain water with a minimum percent of the oxygen, comprising: maintaining a vacuum in a first conduit at a centrifuge that lies in the first conduit, and passing the combination through the centrifuge while the centrifuge spins the combination to urge the gas towards the center of the conduit and to urge the liquid toward the periphery of the conduit, and passing fluid that includes gas, from the center of the first conduit at a location downstream of the centrifuge, into a gas pipe inlet portion. 2. The method described in claim 1 including: maintaining a gas pressure that is less than atmospheric in said gas pipe at a location immediately downstream of said gas pipe inlet portion. 3. The method described in claim 1 wherein: said step of removing gas includes removing gas along a length of the first conduit that is at least equal to the diameter of said gas inlet portion. 4. A method for treating water that contains dissolved air before injecting the water into an underground hydrocarbon reservoir from which hydrocarbons are being produced to minimize oxygen in the injected water, which includes performing at least one removal attempt to remove air from the water, by lowering the pressure of the water in a reduced pressure region of a conduit so dissolved gas is released, which is then removed, comprising: rapidly spinning water in the conduit in said reduced pressure region while continually passing the water downstream along the conduit and removing some of the gas from a center of said conduit, and later again spinning the water from which some of the gas has been removed and removing for a second time, some of the gas from a center of the conduit; injecting nitrogen into the water at a location downstream of where some of the gas has already been removed and upstream of the location where gas is removed for a second time. 5. Apparatus for use in hydrocarbon production that includes a first conduit having a first inlet that receives a flow of a water-gas solution wherein the gas includes oxygen, for separating much of the oxygen from the water, comprising: a centrifuge lying in the first conduit that spins the water-gas solution to urge the gas toward the center of the first conduit and urge the water toward the periphery of the first conduit; a gas pipe with a gas inlet portion that lies at the center of the first conduit and downstream of the centrifuge and that receives fluid that includes gas that lies at the center of the first conduit; means for establishing a water pressure less than atmospheric at said centrifuge to cause some of the gas in the water-gas solution to come out of solution and move to the center of the first conduit for removal through said gas inlet portion; a vacuum pump connected to said gas pipe to increase the withdrawal of gas from said first conduit: and a separator lying along said gas pipe upstream of said vacuum pump, that removes water from fluid in said gas pipe. 6. Apparatus for use in hydrocarbon production that includes a first conduit having a first inlet that receives a flow of a water-gas solution wherein the gas includes oxygen, for separating much of the oxygen from the water, comprising: a centrifuge lying in the first conduit that spins the water-gas solution to urge the gas toward the center of the first conduit and urge the water toward the periphery of the first conduit; a gas pipe with a gas inlet portion that lies at the center of the first conduit and downstream of the centrifuge and that receives fluid that includes gas that lies at the center of the first conduit; means for establishing a water pressure less than atmospheric at said centrifuge to cause some of the gas in the water-gas solution to come out of solution and move to the center of the first conduit for removal through said gas inlet portion; a second centrifuge device lying in said first conduit downstream of said gas inlet portion; a source of nitrogen; a nitrogen-carrying pipe that extends from said source to a location in said conduit that is between said gas inlet portion and said second centrifuge device and which injects nitrogen at said location; a second gas pipe element with a second gas pipe element inlet portion lying closely downstream of said second centrifuge device; said means for establishing also establishes a pressure less than atmospheric at said second centrifuge device. 7. Apparatus for use in hydrocarbon production that includes a first conduit having a first inlet that receives a flow of a water-gas solution wherein the gas includes oxygen, for separating much of the oxygen from the water, comprising: a centrifuge lying in the first conduit that spins the water-gas solution to urge the gas toward the center of the first conduit and urge the water toward the periphery of the first conduit; a gas pipe with a gas inlet portion that lies at the center of the first conduit and downstream of the centrifuge and that receives fluid that includes gas that lies at the center of the first conduit; a vacuum pump coupled to said gas pipe to increase the withdrawal of gas from said first conduit.