METHOD OF HYDROCARBONS DEPOSIT DEVELOMPENT IN LOW-PERMEABILITY SEDIMENTS Russian patent published in 2017 - IPC E21B43/16 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, in the wells, repeated cycles are implemented of pressure decrease and increase, forming a network of micro and macro fractures. Each cycle consists of the steps of hydrocarbons extraction, well downtime, methane agent injection in the same well, repeated downtime. In each cycle, formation hydrocarbon production from wells is carried out until productivity reduction by 30-50% below the initial value of the current cycle. After shutoff, well downtime is for at least 5-7 days for pressure equalization, relaxation of the rock stress-strain state and stabilization of the fracture system in the area covered by the deformation effects at lower bottomhole and formation pressure. During the downtime, the condensate bank parameters are estimated. In the process of gas injection and subsequent downtime, the effectiveness is estimated of the condensate bank deforming due to the condensate evaporation in the gas phase.

EFFECT: increased hydrocarbon extraction rates: gas recovery, condensate recovery, oil recovery, and productivity of production wells.

9 cl, 1 dwg