Patent ID: 8425760

Claim:
A process for transforming at least one gas stream of natural gas or associated gas associated with oil production into transportable liquid fractions, comprising: a) at least one step comprising converting said gas stream into a synthetic gas SG comprising hydrogen and carbon monoxide; b) a step FT comprising Fischer-Tropsch synthesis to convert a least the majority of the SG into Fischer-Tropsch synthesis effluents; c) a step comprising fractionating the effluents from the Fischer-Tropsch synthesis into at least one heavy fraction comprising waxes with a boiling point of more than 565° C. and at least one light fraction, the compounds of which have a boiling point of less than 450° C.; d) a step HCK1 comprising isomerization hydrocracking of a feed of the heavy fraction, in which at least 75% by weight of the fraction of the feed with a boiling point of more than 565° C. is converted into compounds boiling below 565° C.; e) at least one step comprising mixing at least: at least the majority of the effluents from the HCK1 step; said light fraction from step c); a crude oil P; to thereby produce an oil P*.