Underground coal gasification and associated systems and methods

An underground injection system, comprising:

• an injection well extending to an underground region, the injection well being configured to direct an oxidant to the underground region;
• a production well extending from the underground region toward a surface, the production well being configured to direct a product gas from the underground region toward the surface;
• and
• conduits extending to underground areas comprising coal, wherein the underground areas are laterally outward of the underground region such that the conduits at least partially surround the underground region, the conduits being coupled to a source of carbon dioxide and configured to direct a primary fluid comprising the carbon dioxide to the underground areas,
• wherein, in operation, the primary fluid causes the coal of the underground areas to release at least one of water or methane.

An enhanced hydrogen recovery system, comprising:

• conduits extending to an area laterally outward of an underground region, wherein the underground region supports a process in which a product gas comprising hydrogen is produced;
• a primary fluid comprising carbon dioxide, wherein the conduits are configured to direct the primary fluid to the area;
• and
• one or more production wells each spaced apart from each of the conduits and extending from the underground region, the production well being positioned to deliver the product gas from the underground region,
• wherein, in operation, the primary fluid decreases a pore space of the area laterally outward of the underground region.