Protecting the casing-casing annulus in hydrocarbon producing wellbores

A method, comprising:

• extending a plurality of strings of casing into a wellbore, the plurality of strings of casing including:
• an intermediate casing;
• and
• a production casing arranged within the intermediate casing and thereby defining a casing-casing annulus between the production casing and the intermediate casing;
• conveying production tubing into the production casing and thereby defining a tubing-casing annulus between the production tubing and the production casing, wherein an electric submersible pump (ESP) is coupled to the production tubing;
• pumping corrosion inhibiting fluid into the casing-casing annulus and thereby forming a first corrosion-inhibiting barrier within the wellbore;
• and
• pumping corrosion inhibiting fluid into the tubing-casing annulus and thereby forming a second corrosion-inhibiting barrier within the wellbore.

A method, comprising:

• arranging an intermediate casing into a wellbore;
• arranging a production casing within the intermediate casing to define a casing-casing annulus therebetween;
• conveying production tubing into the production casing to define a tubing-casing annulus therebetween, wherein an electric submersible pump (ESP) is coupled to the production tubing;
• pumping the corrosion inhibiting fluid through the tubing-casing annulus, around a downhole end of the production casing, and into the casing-casing annulus;
• radially expanding an annulus packer from an unexpanded state to an expanded state to fluidically seal the corrosion inhibiting fluid in the casing-casing annulus, thereby forming the first corrosion-inhibiting barrier;
• radially expanding a production packer from an unexpanded state to an expanded state to fluidically seal corrosion inhibiting fluid in the tubing-casing annulus, thereby forming a second corrosion-inhibiting barrier.