DEVICE FOR ESTIMATING CHANGE IN PERMEABILITY COEFFICIENT OF BOTTOMHOLE FORMATION ZONE Russian patent published in 2024 - IPC E21C39/00 G01N15/08 

FIELD: oil and gas industry; measurement technology.

SUBSTANCE: invention relates to the field of laboratory study of permeability change (formation damage assessment) of rock when simulating conditions occurring during construction (drilling) of wells, and impact on its pore space with drilling fluids. Device comprises placed in thermostat, by means of which a single formation temperature zone is created and during laboratory simulation the value of this formation temperature is maintained in all units of the device, core holder with a composite core column installed in it, a pump connected to it to create rock pressure in the core holder, connected to the core holder on the "formation" side of the core column, system for maintaining formation pressure when simulating the effect on the pore space of rock with drilling fluid, consisting of a piston container and a high-pressure pump, pump and piston container for creation of formation pressure in pore space of rock, which are connected to the gaseous fluid humidification container, connected to the reservoir fluid supply system, consisting of the piston container and the high-pressure pump, which is also connected to the high-pressure compressor for the gas fluid supply into the pore space of the rock during the well development process simulation, which is connected to an adjustable back pressure valve connected to a separation tank connected to the core holder on the "well" side of the core column, which is connected to its pump and piston container to create bottomhole pressure in pore space of rock, as well as a system for feeding drilling fluid into the pore space of the rock, which is connected to the core holder on the side of the "well" of the core, consisting of two piston containers and two high-pressure pumps, differential pressure meter connected to the core holder, pressure drop meters made on different sides of the core holder, formation temperature meter, as well as valves of shutoff and control valves of high pressure, installed between all parts of the device.

EFFECT: high reliability of estimating change in rock permeability.

1 cl, 1 dwg, 4 tbl