METHOD FOR INCREASING OIL RECOVERY FROM OIL-KEROGEN-CONTAINING PRODUCTIVE FORMATIONS OF THE BAZHENOV FORMATION Russian patent published in 2023 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: used to increase the efficiency of development of hard-to-recover and problematic hydrocarbon deposits, including the Bazhenov and Domanik formations. A method is claimed for enhancing oil recovery from oil-kerogen-containing productive formations, which includes the formation of fluid-conducting channels in the productive formation, which is carried out before hydrocarbon extraction by injecting a working agent through a tubing string into the productive formation. An organic solvent from the group of chlorine-substituted hydrocarbons is used as a working agent, and before injecting the working agent, a packer is installed in a water-filled well, dividing the well into behind-the-packer and below-packer well zones isolated from each other. The working agent is injected into the below-packer zone until the pressure in the below-packer zone exceeds the value of hydrostatic pressure or the value of abnormally high pore pressure. After that, holding is carried out while maintaining the specified pressure by pumping the working agent into the productive formation, during which the near-well zone of the productive formation is impregnated with the working agent to form fluid-conducting channels due to the dissolution of the bitumen components of the productive formation. Next, the products obtained as a result of dissolution are removed from the productive formation onto the day surface of the well, which is carried out in the flowing mode.

EFFECT: increase in oil recovery due to a significant increase in the porosity and permeability of the productive formation in its near-well zone.

2 cl, 5 dwg