Historically, corrosion control in gas wells has been achieved by the use of corrosion inhibitors applied by one of three methods. First, the continuous treatment method whereby inhibitor is continuously injected into one of the tubing strings in a concentric completion and returns through the producing string. Second, the squeeze technique whereby a quantity of inhibitor is forced back into the formation where it slowly feeds back as the well is produced (1). Third, by batch treatment whereby a small quantity of inhibitor is injected into the tubing string at frequent intervals. Recently, it has become desirable to reduce the frequency of batch treatment without a decrease in the protection of the gas well. For this reason, the heavy or high density inhibitors have been formulated and used. The reasoning behind the use of a heavy inhibitor was to get the inhibitor further down the tubing with a shorter shut-in time.
