Patent ID: 8387697

Claim:
A method of thermally treating an oil reservoir by: (a) initiating a chemical reaction in a pay zone of said oil reservoir, using a chemical system comprising at least the following two compositions: (1) a thermal gas emitting composition (TGEC) being an aqueous solution or suspension comprising at least one compound selected from the group consisting of hydrazine nitrate, 1,1-di C 2-6 alkyl hydrazine nitrates and 1,2-di C 2-6 alkyl hydrazine nitrates, 1,1-dimethyl hydrazine nitrate or 1,2-dimethyl hydrazine nitrate, guanidine nitrate, formamide nitric acid adduct, acetamide nitric acid adduct, acetonitrile nitric acid adduct, urea nitric acid adduct, ammonium nitrate, potassium nitrate, sodium nitrate, calcium nitrate, mono, di and tri C 1-5 alkyl amine nitrates, mono, di and tri C 1-5 alkanol amine nitrates, C 2-6 alkylene diamine mono and dinitrates and poly C 1-5 alkylene polyamine polynitrates; and (2) a reaction initiator stabilizer (RIS) being a liquid solution or suspension and comprising at least one compound selected from the group consisting of: metal borohydrides MBH 4 , wherein M is Li, Na or K; aminoboranes (R 1 R 2 R 3 )N·BH 3 , wherein R 1 , R 2 and R 3 are independently hydrogen or C 1-10 alkyl, or wherein R 1 is an aryl or pyridine with up to 10 carbon atoms and R 2 and R 3 are hydrogen; dialkylaluminates MAlH 2 R 1 R 2 , wherein M is Li, Na or K, and R 1 and R 2 are independently C 1-10 alkyl; aminoalanes (R 1 R 2 R 3 )N·AlH 3 , wherein R 1 , R 2 and R 3 are independently hydrogen or C 1-10 alkyl; and aluminum or aluminum alloys with magnesium; (b) introducing granules of aluminum or an aluminum/magnesium alloy as the RIS into an oil well of said oil reservoir and keeping said granules in a first reaction chamber located in the oil well; (c) introducing a first TGEC into the oil well so that it contacts said granules kept in said first reaction chamber for initiating and maintaining a thermochemical reaction producing thermal energy and heating up the walls of said first reaction chamber; (d) introducing a second TGEC into the oil well such that it comes in contact with the heated walls of said first reaction chamber and is ignited; (e) passing the ignited TGEC to a second reaction chamber where the TGEC reacts under production of heat and gases; and (f) passing the produced hot gases into the pay zone of the oil reservoir wherein said thermal gas emitting composition (TGEC) and said reaction initiator stabilizer (RIS) are separately introduced into said oil reservoir and are contacted in the pay zone of said oil reservoir to initiate a chemical reaction producing heat and gases, and wherein the TGEC is continuously introduced into the oil reservoir and the RIS is introduced simultaneously and in a continuous or intermittent way into the oil reservoir.