1
Closmann Philip J: Spreading-fluid recovery of subterranean oil. Shell Oil Company, Coryell H W, April 16, 1974: US3804169 (206 worldwide citation)

In a process for producing shale oil by circulating fluid through a cavity that contacts a subterranean oil shale, the cavity is extended laterally into both an injection well and a plurality of surrounding productions wells and the fluid is circulated at a rate causing the velocity within the cavit ...


2
Closmann Philip J, Suman Jr George O: Method for the recovery of oil from oil shale. Shell Oil Company, Coryell H W, April 16, 1974: US3804172 (204 worldwide citation)

Shale oil is recovered by forming a subterranean cavern that contacts an oil shale, packing the cavern with solid granules and removing organic and inorganic solids from the oil shale by circulating fluid from a surface location, into contact with the oil shale, through a mass of packed granules, an ...


3
Richardson Edwin A: Buffer regulated mud acid. Shell Oil Company, Coryell H W, June 17, 1975: US3889753 (28 worldwide citation)

In reacting a siliceous material with an acidic solution containing hydrogen fluoride, the reaction rate is kept relatively low by contacting the material with an aqueous solution of a fluoride salt, a weak acid and a weak acid salt in proportions that maintain a significant but low concentration of ...


4
Chiu Ying C: Digested alkaline tall oil pitch soap composition. Shell Oil Company, Coryell H W, July 1, 1975: US3892668 (5 worldwide citation)

The oil in a subterranean reservoir is advantageously displaced by injecting into the reservoir an aqueous surfactant system containing a digested alkaline tall oil pitch soap composition produced by heating a mixture of tall oil pitch and an excess of aqueous base for a time and temperature that yi ...


5
Whitten Derrill G, McIntire Daryl C: Down-dip steam injection for oil recovery. Shell Oil Company, Coryell H W, March 5, 1974: US3795278 (3 worldwide citation)

In a dipping reservoir which has an active aquifer located down-dip, oil is recovered by injecting a slug of steam only slightly updip from the original oil-water contact in the reservoir while concurrently and subsequently producing fluid from at least one location updip from the point of steam inj ...