METHOD OF STIMULATING OIL AND GAS FORMATION BY PUMPING LIQUEFIED GAS COMPOSITION Russian patent published in 2019 - IPC E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for stimulation of oil and gas formation. Method involves pumping a composition from liquefied gases to a bottom-hole formation zone by forming a composition of three streams containing a propane-butane mixture, natural gas or associated petroleum gas and nitrogen, which are mixed before pumping. Note here that flow control is performed to vary gas composition, injection rate and volume thereof. According to invention, fourth flow of liquefied carbon dioxide is added, and control of all flows is carried out additionally with possibility to control temperature of gas composition so, that the composition maintains liquid aggregate state on the entire flow from the flow mixing point to the well bottom. Flow control is carried out in a certain sequence. First, a buffer zone is formed by adding an additional stream of a hydrate inhibitor to four main streams. Then, four main streams are fed into the formation until formation of a composition with temperature below the reservoir, which after levelling of its temperature with the reservoir provides growth of intra-bed pressure with excess pressure of formation fracturing. After that, supply of four main flows is continued until formation of fluid column in the well, which provides its killing.

EFFECT: technical result consists in improvement of economic efficiency of hydrocarbon production.

5 cl, 2 dwg