METHOD OF IN-SITU MOLECULAR MODIFICATION OF DEEP-LAYING HEAVY HYDROCARBONS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC E21B43/247 E21B36/00 E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and can be used for irreversible in-situ molecular modification of deep-laying heavy hydrocarbons. Device comprises a water tank, connected by a pipeline, in which a pump is built-in, with an ultra-supercritical water generator, a container for a colloidal solution, saturated with metal microparticles, as well as located in well of heat-insulated tubing string, in lower part of which there is a nozzle head. Device is equipped with an oxidation reactor. First inlet of oxidation reactor is connected to output of ultra-supercritical water generator, and second is connected via pipeline, in which the pump is built-in - with a container for colloidal solution with metal microparticles. Oxidation reactor outlet is connected to heat insulated tubing string. Nozzle head consists of hollow case with radial orifices, thrust in cavity of case in its upper part, sleeve installed with possibility of axial reciprocal movement in cavity of body and periodic contact with thrust. Nozzle is fixed on the sleeve, on which radial holes are made, which have the possibility of alignment with radial holes of the housing during withdrawal of the water-oil emulsion from the productive formation and are not matched with each other at injection of the working agent through the tubing string and nozzle head into the productive formation. Method involves preparation of a working agent on the day surface of the well, in the form of water saturated with a nanosized catalyst and its delivery along the column of heat insulated tubing in the well to the productive formation of the well. Working agent is pumped into the productive formation by injecting it through the flow section of the nozzle head located in the lower part of the production string, with subsequent extraction and delivery to the day surface of the well from the productive formation of the water-oil emulsion. At that, when working agent is prepared on day surface of well, microparticles of metals are additionally introduced into it, after which oxidation of working agent components is performed in reactor to form nanosized particles of metal and hydrogen oxides. After that, heated to 650-600 °C, working agent is injected into productive formation through nozzle head flow section, in which as a result of partial in-situ catalytic gasification of some part of heavy hydrocarbons syngas is generated to increase efficiency of in-situ molecular modification of these heavy hydrocarbons. Water-oil emulsion is withdrawn from the productive stratum through the nozzle head, increasing its flow cross-section as compared to the flow cross-section at pumping of the working agent.

EFFECT: higher efficiency of in-situ irreversible improvement of quality of hydrocarbons and higher efficiency of their selection from productive formation on day surface of well.

6 cl, 3 tbl, 4 dwg