NOVELTY - The process comprises supplying a carbonaceous feedstock (32) comprising a carbon content and a moisture content, an oxygen-rich gas stream (15) optionally comprising steam, a hydromethanation catalyst (31) and a steam stream comprising heat energy to a hydromethanation reactor (200), and reacting a portion of the carbon content from the carbonaceous feedstock in the hydromethanation reactor in the presence of oxygen to produce carbon monoxide, hydrogen and heat energy, where the reaction of the carbon content is sufficient to meet a syngas demand and a heat demand.    USE - The continuous and once-through process is useful for generating gaseous products from a carbonaceous feedstock and generating a methane product stream such as pipeline-quality natural gas product (all claimed), where the gaseous product includes methane and the carbonaceous feedstock includes petroleum coke, coal and biomass.    ADVANTAGE - The process is capable of continuously, efficiently, economically and simply generating gaseous products and methane product stream without gas recycle loops such as carbon monoxide and hydrogen loops and external fired superheaters.    DETAILED DESCRIPTION - The process comprises supplying a carbonaceous feedstock (32) comprising a carbon content and a moisture content, an oxygen-rich gas stream (15) optionally comprising steam, a hydromethanation catalyst (31) and a steam stream comprising heat energy to a hydromethanation reactor (200), reacting a portion of the carbon content from the carbonaceous feedstock in the hydromethanation reactor in the presence of oxygen to produce carbon monoxide, hydrogen and heat energy, where the reaction of the carbon content is sufficient to meet a syngas demand and a heat demand, reacting the carbonaceous feedstock in the hydromethanation reactor in the presence of carbon monoxide, hydrogen, steam and hydromethanation catalyst to produce a methane-enriched raw product stream (50) comprising methane, carbon monoxide, hydrogen, carbon dioxide and heat energy, where the reaction of the carbonaceous feedstock has a steam demand, the syngas demand and the heat demand, withdrawing the methane-enriched product stream from the hydromethanation reactor, introducing the methane-enriched raw product stream into a heat exchanger to recover heat energy and generate a cooled methane-enriched raw product stream (70), super-heating the steam stream before introduction of the methane-enriched raw product stream into the hydromethanation reactor and generating a first process steam stream using the recovered heat energy, optionally sour shifting a portion of the carbon monoxide in the cooled methane-enriched raw product stream to generate heat energy and a hydrogen-enriched treated product stream having a molar ratio of hydrogen to carbon monoxide of less than 3:1, optionally recovering heat energy, where a portion of the heat energy is utilized to generate a second process steam stream, optionally reacting a portion of the hydrogen and the carbon monoxide in the cooled methane-enriched raw product stream in a catalytic methanator in the presence of a sulfur-tolerant methanation catalyst to produce a methane-enriched treated product stream, optionally recovering heat energy, where a portion of the recovered heat energy is utilized to generate a third process steam stream, removing a portion of the carbon dioxide and the hydrogen sulfide from the cooled methane-enriched raw product stream to produce a sweetened gas stream comprising a portion of the hydrogen, carbon monoxide and methane from the cooled methane-enriched raw product stream, optionally separating a portion of hydrogen from the sweetened gas stream to produce a hydrogen-depleted sweetened gas stream comprising methane, hydrogen and carbon monoxide, reacting carbon monoxide and hydrogen present in the sweetened gas stream in a catalytic methanator in the presence of a methanation catalyst to produce heat energy and a methane-enriched sweetened gas stream, recovering heat energy, where a portion of the recovered heat energy is utilized to generate a fourth process steam stream, and recovering a portion of the methane-enriched sweetened gas stream as the methane product stream. The steam demand is satisfied by the steam stream and steam generated from the moisture content of the carbonaceous feedstock. The steam stream is made from a portion of the first process steam stream, the fourth process steam stream, the second process steam stream, and the third process steam stream. The amount of the oxygen-rich gas stream supplied to the hydromethanation reactor is varied as a process control. A char by-product is generated in the reaction of the carbon content and the carbonaceous feedstock, is continuously or periodically withdrawn from the hydromethanation reactor, and comprises an alkali metal content from the hydromethanation catalyst. The hydromethanation reactor comprises a collection zone. The oxygen-rich gas stream is introduced into the collection zone of the hydromethanation reactor. The methane-enriched raw product stream comprises 50 mole % of methane plus carbon dioxide based on the moles of methane, carbon dioxide, carbon monoxide and hydrogen in the methane-enriched raw product stream. The carbonaceous feedstock is loaded or impregnated with hydromethanation catalyst before supplying step. The hydromethanation catalyst comprises an alkali metal, and comprises recycled hydromethanation catalyst and a make-up hydromethanation catalyst. A portion of the char by-product is treated to recover a portion of the alkali metal content. A portion of the recovered alkali metal content is recycled as hydromethanation catalyst. The hydromethanation reactor is operated at a temperature of 700-1500 degrees F and a pressure of 250-800 psig.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a hydromethanation process for generating methane-enriched raw product stream.    Oxygen-rich gas stream (15)    Hydromethanation catalyst (31)    Carbonaceous feedstock (32)    Methane-enriched raw product stream (50)    Cooled methane-enriched raw product stream (70)    Hydromethanation reactor. (200)