METHOD FOR DEVELOPMENT OF ZONAL-INHOMOGENEOUS KEROGEN-CONTAINING FORMATION Russian patent published in 2024 - IPC E21B43/00 E21B28/00 E21B49/00 G01V1/02 

FIELD: mining.

SUBSTANCE: invention relates to a method for development of a zone-heterogeneous kerogen-containing formation. Method involves drilling and development of the formation represented by lenses and the matrix containing them in stages in a certain sequence, taking into account the areal location of the lenses. Location of lenses is selected by means of pilot radial channels drilled from uncased boreholes in the bedding plane of the formation. First well is first completed in the formation with an auxiliary vertical shaft; a seismic-acoustic transducer – elastic waves emitter is placed in it at the level of the formation when the deflector is lowered. Radiator is connected to the mouth by a wire line. Method also involves drilling pilot radial channels in the formation around the well and the radiator using a hydraulic jet assembly. Assembly is equipped with an elastic wave receiver. In the process of pilot radial channels routing, elastic waves are created by the radiator. Elastic waves are received at the wellhead in real time by the receiver of the hydraulic jet assembly. Based on the data, taking into account the well logging data of the assembly, seismoacoustic scanning of the formation is carried out and lenses are selected in the vicinity of the vertical shaft of the first well. Further drilling of the formation with the main boreholes is carried out in the direction of the selected lenses, which after casing of the main boreholes are opened with radial channels and through them the formation is developed until oil production in these lenses is dropped. Then, kerogen matrix is developed, which is drilled with radial channels between wells in separate sections based on capabilities of used hydraulic jet drilling assembly. In each section there created are two through networks of parallel radial channels evenly located in the matrix volume, through which process agents are applied to the formation in wave mode. Also, an artificial reservoir is created and hydrocarbons are extracted from it with conversion of kerogen. Each network is created independently of each other with the possibility of establishing a separate hydrodynamic connection between wells, pumping and flushing of process agents along the entire length of radial channels. Radial channels of each network are drilled from common inlet of one well to common inlet of another well with formation of two common inlets to sections of each well. Depending on the operating mode of this well, two of its common inlets or only one of them are connected to the inter-packer port of the injection-production assembly lowered into each well. Injection-producing assembly is equipped with flow interrupter in form of ball valve, valve motor connected to control unit, and located along the flowing medium in the wall of the assembly, which is lowered into the predominantly injection well and across the flowing medium inside the assembly, which is lowered into the predominantly production well.

EFFECT: involvement in development of a larger number of drained lenses of the formation in the vicinity of the wells being drilled with a decrease in their number, intensification of external action on the formation, increased coverage of its effect due to uniform distribution of created zones of artificial collector in volume of matrix.

1 cl, 11 dwg