PROCEDURE FOR DEVELOPMENT OF DEPOSITS OF HIGH VISCOUS OIL (VERSIONS) Russian patent published in 2009 - IPC E21B43/24 C09K8/592 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to development of oil deposits and can be implemented for extraction of high viscous oil by means of thermal influence on reservoir. The procedure of development of high viscous oil reservoirs by means of thermal-steam treatment consists in pumping reagent solution with alternating fringes; notably, reagent decomposes under influence of temperature and gives off carbonic dioxide and steam; carbamide is used as said reagent; pumping of said solution is effected via a steam pressure well with not less, than two fringes; upon pumping the whole volume of solution, there is carried out pumping of water in volume 2 m³ exceeding volume of the flow string; further steam is pumped; also the said solution additionally contains ammonium nitrate, ammonium thiothyanic, complex surface active substance - SAS, neftenol BBD or mixture of non-ionogenic SAS - AF9-12 or NP-40, or NP-50 and anionoactive SAS - volgonate or Sulfonal, or NPS-6 at the following ratio of components, wt %: carbamide 15.0-40.0, ammonium nitrate 8.0-20.0, ammonium thiothyanic 0.1-0.5, Neftenol BBD 1.0-5.0, water - the rest or carbamide 15.0-40.0, ammonium nitrate 8.0-20.0, ammonium thiothyanic 0.1-0.5, non-ionogenic SAS 1.0-2.0, anionactive SAS 0.5-1.0, water - the rest; according to another version carbamide is used as the said reagent; pumping of the said solution is effected through a steam-cyclic producing well with not less, than two fringes; upon pumping the last fringe of steam there is carried out pumping of oil fringe; the said well is held for impregnation; further it is started; also the said solution additionally contains ammonium nitrate, ammonium thiothyanic, complex SAS Neftenol BBD or mixture of non-ionogenic SAS - AFD9-12 or NP-40, or NP-50 and anionactive SAS - volgonate or Sulfonal, or NPS-6 at the following ratio, wt %: carbamide 15.0-40.0, ammonium nitrate 8.0-20.0, ammonium thiothyanic 0.1-0.5, Neftenol BBD 1.0-5.0, water - the rest or carbamide 15.0-40.0, ammonium nitrate 8.0-20.0, ammonium thiothyanyc 0.1-0.5, non-ionogenic SAS 1.0-2.0, anionactive SAS 0.5-1.0, water - the rest.

EFFECT: increased efficiency of thermo-steam effect on reservoir of high viscous oil.

2 cl, 2 dwg