Methods and apparatus to change the mobility of formation fluids using thermal and non-thermal stimulation

A method of changing a subsurface formation fluid mobility, comprising:

• conveying a tool to a subsurface location on a wireline;
• initiating a chemical reaction with the tool with one or more chemicals to produce heat and, wherein a product of the chemical reaction is a gaseous diluent;
• exposing the product of the chemical reaction to the formation to change the mobility of a formation fluid;
• and
• obtaining a sample of the formation fluid after exposing the product of the chemical reaction to the formation wherein exposing the product of the chemical reaction to the formation comprises at least partially dissolving the gaseous diluent in the formation fluid.

A method of changing a subsurface formation fluid mobility, comprising:

• conveying a tool to a subsurface location on a wireline;
• initiating a chemical reaction with the tool with one or more chemicals to produce heat and, wherein a product of the chemical reaction is a gaseous diluent;
• exposing the product of the chemical reaction to the formation to change the mobility of a formation fluid;
• and
• obtaining a sample of the formation fluid after exposing the product of the chemical reaction to the formation wherein initiating the chemical reaction comprises exposing the one or more chemicals to a catalyst.

A method of changing a subsurface formation fluid mobility, comprising:

• conveying a tool to a subsurface location on a wireline;
• initiating a chemical reaction with the tool with one or more chemicals to produce heat and, wherein a product of the chemical reaction is a gaseous diluent;
• exposing the product of the chemical reaction to the formation to change the mobility of a formation fluid;
• and
• obtaining a sample of the formation fluid after exposing the product of the chemical reaction to the formation and further comprising substantially decreasing an amount of carbon dioxide in the product of the chemical reaction prior to exposing the product of the chemical reaction to the formation.