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Method and apparatus of inhibiting corrosion of well tubing. A corrosion monitor detects the concentration of a corrosive element in fluid produced from well tubing. Corrosion inhibitor is injected into the tubing by a pump at the depth at which water vapor condenses. A computer is programmed with a

Method and apparatus of inhibiting corrosion of well tubing. A corrosion monitor detects the concentration of a corrosive element in fluid produced from well tubing. Corrosion inhibitor is injected into the tubing by a pump at the depth at which water vapor condenses. A computer is programmed with a formula which generates an optimum concentration of corrosion inhibitor for a given concentration of the corrosive element. The computer is operatively connected to the monitor and receives data therefrom to generate a signal which is used to control the pump speed.

대표청구항 ▼

A method for inhibiting corrosion of production tubing in a well comprising the steps of: determining an initial vapor condensation depth in the well at which water vapor condenses; monitoring the concentration of a corrosive element in fluid produced from the production tubing; injecting a corrosio

A method for inhibiting corrosion of production tubing in a well comprising the steps of: determining an initial vapor condensation depth in the well at which water vapor condenses; monitoring the concentration of a corrosive element in fluid produced from the production tubing; injecting a corrosion inhibitor directly into the production tubing at approximately said initial vapor condensation depth; and varying the flow rate of injected corrosion inhibitor responsive to the monitored concentration of the corrosive element. Apparatus for inhibiting corrosion of well production tubing comprising: a corrosion monitor means for monitoring the concentration of a corrosive element produced from the well production tubing; selective injection means for selectively injecting corrosion inhibitor into the production tubing at one or more of at least two preselected well depths, said selective injection means including: first and second injector valve assemblies disposed in said production tubing at a first depth and a lower second depth, respectively, said first depth being approximately equal to an intial vapor condensation depth at which produced water vapor condenses in said production tubing, and said second being substantially lower than said first depth; injection tubing means connecting a source of corrosion inhibitor to said first and second injector valve assemblies; and selectively operable valve means, disposed in said injection tubing means, for selectively opening and closing said injection tubing means for flow to said second injector valve assembly; and control means for injecting corrosion inhibitor into the tubing at a rate which varies responsive to said monitored concentration.