Abstract: The method for determining equilibrium wettability of an interface between a void space and a solid phase of a rock sample comprises obtaining a three-dimensional image of the internal structure of the sample. On the obtained image of the internal structure of the sample, a void space and a solid phase are differentiated. An interface between the void space and the solid phase of the sample and distribution of minerals on this surface are determined. Wettability of the solid phase at each point of the interface between the void space and the solid phase of the rock sample is determined. A process of oil migration to the void space filled with stratum water at the initial stage of formation of an oil and gas field is numerically simulated, and finally, the equilibrium wettability of the interface between the void space and the solid phase of the rock sample is determined.

Abstract: The method for determining equilibrium wettability of an interface between a void space and a solid phase of a rock sample comprises obtaining a three-dimensional image of the internal structure of the sample. On the obtained image of the internal structure of the sample, a void space and a solid phase are differentiated. An interface between the void space and the solid phase of the sample and distribution of minerals on this surface are determined. Wettability of the solid phase at each point of the interface between the void space and the solid phase of the rock sample is determined. A process of oil migration to the void space filled with stratum water at the initial stage of formation of an oil and gas field is numerically simulated, and finally, the equilibrium wettability of the interface between the void space and the solid phase of the rock sample is determined.

Abstract: In order to determine a volume thermal expansion coefficient of a liquid, a sample of the liquid is placed inside a cell of a calorimeter followed by an incremental increase of pressure inside the cell containing the liquid. After each pressure increase heat flow into the cell and volume of the liquid are measured. Based on results of the measurements of the heat flow and accounting for initially evaluated cell volume, the volume thermal expansion of the liquid is determined.

Abstract: A measuring cell of a differential scanning calorimeter comprises a cylindrical housing made of a high thermal conductivity metal. At least one metal disk-shaped insert made of a high thermal conductivity metal is disposed in the housing, an upper part of the disk-shaped insert has a recess for placing a sample of a test material. There is a sealed lead-in in an upper part of the housing for evacuating the cell and for supplying a liquid into the cell, and a lower part of the housing is equipped with a sealed cover capable of being sealed in the housing.

Abstract: A sample of a material is placed into a measuring cell of a calorimeter consisting of upper and the lower parts connected with each other by a movable detachable tight connection. The cell is equipped with two coaxially arranged tubes capable of independent connection to external devices. An outer tube is connected to the upper part of the cell and an inner tube is connected to the lower part of the cell via the movable detachable tight connection and is movable. At least once a contact of the sample with vapor of a liquid is provided and heat of adsorption is measured, then contact of the sample with the same or another liquid is provided and heat of wetting of the sample by the same or the other liquid is measured.

Abstract: In order to determine surface wettability of a material, at least one sample of the material is placed into at least one sealed calorimeter cell. The at least one sample is brought into contact with a first wetting liquid and with a second wetting liquid at the same pressure and temperature. Heats of immersion of a surface of the at least one sample by the first and second wetting liquids are measured, then the wettability is calculated.

Abstract: A method for determining properties of a formation comprises disposing at least one acoustic logging tool in a well and moving the logging tool along the well. An acoustic logging is performed during movement of the acoustic logging tool together with simultaneous thermal treatment of the formation. A temperature of a formation zone being thermally treated is measured as well as attenuation and velocity of the Stoneley waves excited by the acoustic logging tool. Based on the obtained dependencies of measured parameters as functions of the formation zone temperature formation relative phase permeabilities, formation fluid viscosity and viscous flow activation energy are determined.

Abstract: Methods to determine a quantitative composition of a multi-component medium are described. These methods provide for placing a sample into a cell of a differential scanning calorimeter and injecting a liquid into the cell, the liquid has a known volume thermal expansion coefficient and a known volume heat capacity. A total heat capacity and a total volume thermal expansion coefficient are determined for the sample and the fluid inside the cell. Solving system of equations it is possible to determine volumes of components composing the sample.

Abstract: In order to determine a volume thermal expansion coefficient of a liquid, a sample of the liquid is placed inside a cell of a calorimeter followed by an incremental increase of pressure inside the cell containing the liquid. After each pressure increase heat flow into the cell and volume of the liquid are measured. Based on results of the measurements of the heat flow and accounting for initially evaluated cell volume, the volume thermal expansion of the liquid is determined.

Abstract: A sample of a material is placed into a measuring cell of a calorimeter consisting of upper and the lower parts connected with each other by a movable detachable tight connection. The cell is equipped with two coaxially arranged tubes capable of independent connection to external devices. An outer tube is connected to the upper part of the cell and an inner tube is connected to the lower part of the cell via the movable detachable tight connection and is movable. At least once a contact of the sample with vapor of a liquid is provided and heat of adsorption is measured, then contact of the sample with the same or another liquid is provided and heat of wetting of the sample by the same or the other liquid is measured.

Abstract: To increase permeability of a near-wellbore zone of a formation an operation on stimulation of a fluid flow into a wellbore is performed, the operation comprising injecting chemical substances into a targeted zone of the formation. During the stimulation an electrical field is applied to the targeted zone of the formation.

Abstract: Surface wettability of a material is determined by placing at least one sample of this material in at least one sealed calorimeter cell. Then a contact is provided of the at least one sample with a first wetting fluid and with a second wetting fluid at the same temperature and pressure. Heats of immersion are measured of the at least one sample in the first and the second wetting fluids and a wettability parameter is calculated for a solid/fluid/fluid system.

Abstract: A method for determining properties of a formation is described herein. The method includes disposing a well-logging tool in a borehole. The well-logging tool includes a device for varying temperature of the formation and two acoustic logging probes located symmetrically along the well-logging tool length relative to the device for varying temperature of the formation. During the logging tool movement in the borehole, continuous varying of the formation temperature, continuous acoustic logging, and continuous measurement of formation temperature are performed. Dependencies of the measured velocity and attenuation of the Stoneley waves as functions of the measured temperature of the formation are obtained. Based on the obtained dependencies, properties of the formation are determined.

Abstract: A method for determining properties of a formation comprises disposing at least one acoustic logging tool in a well and moving the logging tool along the well. An acoustic logging is performed during movement of the acoustic logging tool together with simultaneous thermal treatment of the formation. A temperature of a formation zone being thermally treated is measured as well as attenuation and velocity of the Stoneley waves excited by the acoustic logging tool. Based on the obtained dependencies of measured parameters as functions of the formation zone temperature formation relative phase permeabilities, formation fluid viscosity and viscous flow activation energy are determined.

Abstract: The method for a productive formation properties determination comprises positioning a complex well-logging tool in a borehole, the well-logging tool consists of the device for the formation temperature impact and two similar logging probes located symmetrically along the well-logging tool relative to the device for the formation temperature impact. During the logging tool movement in the borehole continuous formation temperature impact and formation temperature measurement are performed. Based on the obtained dependencies of the formation parameters in question as a function of temperature the productive formation properties are determined.