METHOD OF GAS DEPOSIT DEVELOPMENT IN LOW PERMEABLE SILICEOUS OPOKAMORPHIC RESERVOIRS Russian patent published in 2021 - IPC E21B43/20 E21B43/26 G06F30/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used to develop gas deposits in non-traditional for Western Siberia, low permeable porous-fractured opokamorphic reservoirs of the Berezovskaya Formation. The method includes drilling horizontal production wells with the predominantly ascending profile in the target interval of the reservoir and placing clusters in areas of the reservoir with developed natural fracturing. The azimuth of drilling horizontal wellbores is perpendicular to the direction of the maximum formation stress δ_max. After that the flow of natural gas is directed to the horizontal well with the help of multistage hydraulic fracturing (MHF). Natural gas is produced in the mode of depletion of reservoir energy. At the same time, the stage of drilling horizontal wells presupposes that the presence of natural fractures in the productive reservoir is diagnosed using special logging while drilling systems (LWD) and the "logging-inject-logging" method. The study of the development of natural fracturing is carried out at the preliminary stage of a comprehensive study of the object: seismic observations, a special LWD complex, SGRL/SPCGRL, core examination, object modeling taking into account geomechanical properties and a system of natural micro- and macrocracks. To achieve maximum development coverage of the low-permeability opokamorphic gas reservoir of the Berezovskaya Formation characterized by high lateral permeability variability, the injected amount and the frequency of placement of hydraulic fracturing ports along the horizontal wellbore are chosen depending on the presence or absence of fracturing. The hydraulic fracturing ports should be located closer to each other in the HW section in the zone where there is no fracturing. The distance between the ports should be L1. When it comes to the fractured zone, there should be bigger distance between the hydraulic fracturing ports. In this case, the distance should be L2> L1.

EFFECT: invention increases efficiency of gas reservoir development due to a comprehensive study of the object at the preliminary stage and diagnosing natural fracturing and the placement of hydraulic fracturing ports along the horizontal wellbore at the stage of drilling production wells.

1 cl, 3 dwg