Patent ID: 8733439

Claim:
A process for in situ fracturing of shale formations of all types including extraction of oil and gas from oil sand, extraction of oil and gas from biomass and extraction of gas from hydrates, comprising: (a) injecting CO 2 and H 2 O 2 containing a catalyst comprising Fe, Co or Ni into said formation at an elevated temperature together with proppants through injection wells to fracture the shale and dislodging the oil and gas from oil sands, biomass and hydrates to produce hydrocarbon liquids and gases; (b) recovering produced hydrocarbon liquids and gases through production wells; (c) heating the CO 2 and H 2 O 2 to provide energy to break the CO 2 molecule and to thermally fracture the shale; (d) providing the production wells with safety devices; (e) providing a main production well with a retractable orifice plate to avoid excess pressure upstream of a blowout preventer (BOP), thereby avoiding possible unsafe situations; (f) providing a small parallel well connected with the main production well and providing a second safety device in the small parallel well, wherein the second safety device is a rupture disc which provides a second form of safety devices upstream of the BOP; and (g) treating the produced oil and gas to remove impurities, wherein the purified gas and liquid is sent to storage.