A method for determining properties of different cation exchange sites in a rock core sample at a non-preserved state may include displacing all native components out of the rock core sample before subjecting the rock core sample to coreflooding steps to determine a total amount of exchangeable cations adsorbed onto the cation exchange sites; injecting formation brine and then a reservoir crude oil into the rock core sample such that the rock core sample includes indigenous exchangeable cations adsorbed onto the cation exchange sites, cation exchange sites occupied by a crude oil, and one or more fluids; subjecting the rock core sample to coreflooding steps to displace the indigenous exchangeable cations, the crude oil, and the one or more fluids; determining an amount of indigenous exchangeable cations adsorbed onto the cation exchange sites; and determining at least one property of different cation exchange sites.

A method for determining properties of different cation exchange sites in a rock core sample at a non-preserved state may include displacing all native components out of the rock core sample before subjecting the rock core sample to coreflooding steps to determine a total amount of exchangeable cations adsorbed onto the cation exchange sites; injecting formation brine and then a reservoir crude oil into the rock core sample such that the rock core sample includes indigenous exchangeable cations adsorbed onto the cation exchange sites, cation exchange sites occupied by a crude oil, and one or more fluids; subjecting the rock core sample to coreflooding steps to displace the indigenous exchangeable cations, the crude oil, and the one or more fluids; determining an amount of indigenous exchangeable cations adsorbed onto the cation exchange sites; and determining at least one property of different cation exchange sites.

The present invention provides an adjustment device for a flexible wall surface suitable for droplet impact, which includes a base, a staybolt, an experiment substrate and the wall surface to be tested, wherein the periphery of the wall surface to be tested is fixed to the upper surface of the experiment substrate by an adhesion agent and the inclination angle of the wall surface to be tested is adjusted by adjusting the left two staybolts and right two staybolts on the experiment substrate to different heights; and a plurality of through holes are uniformly formed on the experiment substrate and provided therein with wall surface adjusting bolts used to abut against and apply force to the wall surface to be tested, so as to allow the wall surface to be tested to present a desired curved shape.

The present invention provides an adjustment device for a flexible wall surface suitable for droplet impact, which includes a base, a staybolt, an experiment substrate and the wall surface to be tested, wherein the periphery of the wall surface to be tested is fixed to the upper surface of the experiment substrate by an adhesion agent and the inclination angle of the wall surface to be tested is adjusted by adjusting the left two staybolts and right two staybolts on the experiment substrate to different heights; and a plurality of through holes are uniformly formed on the experiment substrate and provided therein with wall surface adjusting bolts used to abut against and apply force to the wall surface to be tested, so as to allow the wall surface to be tested to present a desired curved shape.

The invention relates to the technical field of oilfield exploration, and discloses a 4D quantitative and intelligent diagnosis method and system for spatio-temporal evolution of oil-gas reservoir damage types and extent. The method includes: determining a characteristic parameter characterizing reservoir damage by each of a plurality of factors based on a spatio-temporal evolution simulation equation of reservoir damage by each of the plurality of factors; and determining an effective characteristic parameter characterizing the damage extent of the reservoir based on the characteristic parameter characterizing reservoir damage rby each of the plurality of factors. The invention can quantitatively simulate the characteristic parameters of reservoir damage caused by the various factors and a total characteristic parameter of the reservoir damage. Therefore for a well without reservoir damage, performing quantitative prediction of reservoir damage and spatio-temporal deduction of damage laws is of scientific guidance significance for preventing reservoir damage, and formulating development plans for oil pools and subsequent well stimulation measures, and for a well with reservoir damage, also performing quantitative diagnosis of reservoir damage and spatio-temporal deduction of damage laws achieves optimal design of a declogging measure and improvement or restoration of oil-gas well production and water well injection capacity.

The invention relates to the technical field of oilfield exploration, and discloses a 4D quantitative and intelligent diagnosis method and system for spatio-temporal evolution of oil-gas reservoir damage types and extent. The method includes: determining a characteristic parameter characterizing reservoir damage by each of a plurality of factors based on a spatio-temporal evolution simulation equation of reservoir damage by each of the plurality of factors; and determining an effective characteristic parameter characterizing the damage extent of the reservoir based on the characteristic parameter characterizing reservoir damage rby each of the plurality of factors. The invention can quantitatively simulate the characteristic parameters of reservoir damage caused by the various factors and a total characteristic parameter of the reservoir damage. Therefore for a well without reservoir damage, performing quantitative prediction of reservoir damage and spatio-temporal deduction of damage laws is of scientific guidance significance for preventing reservoir damage, and formulating development plans for oil pools and subsequent well stimulation measures, and for a well with reservoir damage, also performing quantitative diagnosis of reservoir damage and spatio-temporal deduction of damage laws achieves optimal design of a declogging measure and improvement or restoration of oil-gas well production and water well injection capacity.

A fluid separation device includes a centrifugal separator configured to receive a centrifugal separation chamber of a disposable fluid flow circuit, a pump system configured to convey a fluid into the centrifugal separation chamber and to remove a separated fluid component from the centrifugal separation chamber via an outlet, a color-based interface monitoring system configured to determine an interface position between separated fluid components continuously flowing through the centrifugal separation chamber based on dominant wavelength measurements of layers of separated fluid components during a centrifugal separation procedure, and a controller configured to measure the dominant wavelengths of the layers, calculate a duration as a color time for each measured dominant wavelength, set target color times, calculate error signals and calculate control signals to adjust the pump system to control the flow rate and interface position.

A fluid separation device includes a centrifugal separator configured to receive a centrifugal separation chamber of a disposable fluid flow circuit, a pump system configured to convey a fluid into the centrifugal separation chamber and to remove a separated fluid component from the centrifugal separation chamber via an outlet, a color-based interface monitoring system configured to determine an interface position between separated fluid components continuously flowing through the centrifugal separation chamber based on dominant wavelength measurements of layers of separated fluid components during a centrifugal separation procedure, and a controller configured to measure the dominant wavelengths of the layers, calculate a duration as a color time for each measured dominant wavelength, set target color times, calculate error signals and calculate control signals to adjust the pump system to control the flow rate and interface position.

A microfluidic device includes a microfluidic substrate having a porous media channel, an oil inlet port in fluid communication with the porous media channel, a fluid inlet port in fluid communication with the porous media channel, and an outlet port in fluid communication with the porous media channel. The porous media channel has a plurality of dividers that provide the porous media channel with a network of fluid pathways. A method for assessing miscibility of an oil composition and a fluid includes flowing an aliquot of a fluid through a porous media channel to displace at least an oil composition from the porous media channel, and conducting an optical investigation of the porous media channel to assess the miscibility of the oil composition and the fluid at the test pressure and test temperature.

A microfluidic device includes a microfluidic substrate having a porous media channel, an oil inlet port in fluid communication with the porous media channel, a fluid inlet port in fluid communication with the porous media channel, and an outlet port in fluid communication with the porous media channel. The porous media channel has a plurality of dividers that provide the porous media channel with a network of fluid pathways. A method for assessing miscibility of an oil composition and a fluid includes flowing an aliquot of a fluid through a porous media channel to displace at least an oil composition from the porous media channel, and conducting an optical investigation of the porous media channel to assess the miscibility of the oil composition and the fluid at the test pressure and test temperature.