04823875 is referenced by 41 patents and cites 11 patents.

Subterranean oil and gas producing formations are fractured in a first embodiment by providing one or more combustion gas generating units using rocket fuel type propellants disposed in a well casing at preselected depths. The well casing is filled with a compressible hydraulic fracturing fluid comprising a mixture of liquid, compressed gas, and propant material and precompressed to a pressure of about 1,000 psi or more greater than the fracture extension pressure at the depth of the zone to be fractured. At least one of the gas generating units is equipped with perforating shaped charges to form fluid exit perforations at the selected depth of the fracture zone. The gas generating units are simultaneously ignited to generate combustion gasses and perforate the well casing. The perforated zone is fractured by the rapid outflow of an initial charge of sand free combustion gas at the compression pressure followed by a charge of fracturing fluid laden with propant material and then a second charge of combustion gas. The column of precompressed fracturing fluid is discharged into the formation until the hydraulic extension pressure is reached and eventually the perforations sanded off. In a first alternative of a second embodiment fracturing is effected by the forces of decompression without use of a combustion gas generating unit. In a second alternative of the second embodiment the fracturing fluid comprises a pure sand free liquid.

Title
Well treating method and system for stimulating recovery of fluids
Application Number
686990
Publication Number
4823875
Application Date
December 30, 1987
Publication Date
April 25, 1989
Inventor
Gilman A Hill
Englewood
CO, US
Agent
Hubbard Thurman Turner & Tucker
Assignee
Mt Moriah Trust
CO, US
IPC
E21B 43/267
E21B 43/26
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