Assertion: hydrocarbon's formation | /r/CapableOf | comprise displacing the petroleum
Facets:
value: from the formation
type: TEMPORAL
Source sentences:
text: That method of recovering petroleum from an underground formation comprising displacing the petroleum from the formation to and recovering it from a production well by introducing into the formation a succession of premixed mixtures of said petroleum and fluid hydrocarbon material selected from the group consisting of normally liquid hydrocarbons in the natural gasoline boiling range and mixtures of propane and butane, said mixtures being of progressively decreasing viscosity, then injecting hydrocarbon fluid of said natural gasoline boiling range, then injecting a mixture of propane and butane, and finally injecting natural gas, and between each of said injections injecting a premixed mixture of the preceding and the following hydrocarbon fluids.