Schlumberger Technology Corporation

Schlumberger Technology Company

Evgeny Mikhailovich Chuvilin

Alexander Nadeev

Dmitry Mikhailovich Mikhailov

Valery Vasilievich Shako

Olga Vladimirovna Popova

Oleg Dinariev

Sergey Sergeevich Safonov

Dmitry Alexandrovich Korobkov

Tatiyana Buida

Evgeny Samarin

A sample of frozen rocks is placed into contact with a frozen solution of an X-ray contrast agent at subzero temperature. Upon the end of saturation of the sample, a computed X-ray microtomography of the sample is conducted at a subzero temperature. The obtained microtomographic image is analyzed and spatial distribution and concentration of ice and/or gas hydrate inclusions, as well as open and closed porosity are determined.

Method for examining samples of frozen rocks

A sample of porous material is placed in a calorimeter cell and a pressure in the cell is increased starting from a pressure value of a first step by filling the cell with a wetting fluid. Measurements are taken of a heat flow to the cell and a fluid volume at each step. Then, the pressure in the cell is decreased to the pressure value of a first step with continued measurements of the heat flow to the cell. Increase and following decrease of the fluid pressure in the cell are repeated at least once. Then a temperature in the cell is decreased below a wetting fluid crystallization point. Once the fluid has been fully crystallized in sample pores, the temperature in the cell is increased above a wetting fluid melting point. Wetting limiting angle of the pores filled with fluid, and pore sizes are determined based on the results of heat flow measurements with due consideration of heat effect of fluid compression.

Method for determining the properties of porous materials

A sample of an unconsolidated porous medium is frozen and at subzero temperature is placed into contact with a frozen solution of an X-ray contrast agent. Upon the end of saturation of the sample, X-ray computed microtomography of the sample is conducted at subzero temperatures and by means of analyzing the obtained computer tomograhic image, spatial distribution and concentration of ice and/or gas hydrate inclusions, open and closed porosity, pore size distribution, specific surface in the sample are determined.

Method for examining samples of unconsolidated porous media

For the purpose of determining a weight concentration of a clay material in a porous medium sample, a specific active surface area of the clay material and an initial specific active surface area of the porous sample are measured. A water solution of the clay material is pumped through the sample and a specific active surface area of the sample of the porous medium is measured after the pumping. Then, the weight concentrationof the clay material is calculated.

Method for determining weight concentration of clay in a sample of a porous medium

Determining weight concentration of clay in a sample of a porous material, a water-soluble salt of a metal is selected that enters in a selective ion exchange reaction with clay, with the general formula RM, where a metal Ris selected from the group {Ba; Sr; Tl; Rb. . . }, Mis selected from the group {Cl; NO; OHn; CH3COO, SO; . . . } in accordance with the table of solubility of inorganic substances in water. Clay is marked by means of mixing the clay with a water solution of the selected salt of the metal, residues of the salt of the metal that have not interacted with the clay are removed. X-ray fluorescent spectrometry of the marked clay and of the sample is conducted and content of the metal in the marked clay and natural content of the metal in the sample are determined. A water solution of the marked clay is pumped through the sample, the sample is dried and X-ray fluorescent spectrometry of the entire sample or of its individual segments is conducted. Content of the metal in the sample or in each segment is determined and weight concentrations of clay retained in the sample or in each of its segments are determined.

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Moscow, Russia

Evgeny Mikhailovich Chuvilin