Forming cup for rock sample processing and rock sample volume measurement method

Abstract

The invention discloses a molding cup for rock sample treatment and a determination method of rock sample volume. The molding cup comprises a cup body, a bottom pad, an external cylindrical disc, a supporting rod and a spring. The cup body is cylindrical; the bottom pad is a thin cylinder and arranged in the cup at the bottom; the bottom pad has a diameter similar to an internal diameter of the cup body; the center of the cup bottom is provided with a bottom hole; the external cylindrical disc is arranged at a lower part outside the cup; the vertical supporting rod is arranged on the external cylindrical disc; the supporting rod passes through the bottom hole and is in detachable fixed connection with the bottom pad; and a spring is arranged between the external cylindrical disc and an outer wall of the cup bottom, and is in a V shape. The method comprises steps of: preparing an irregular rock sample and a hot melt adhesive into a regular cylinder through the molding cup; calculating the volume; and detracting the volume of the hot melt adhesive to obtain the volume of the rock sample. The molding cup and the determination method provided by invention can realize precise determination of rock sample volume aiming at the irregular rock sample, and has advantages of simple equipment and method, and high accuracy.

Description

technical field [0001] The invention relates to the field of geological exploration and development of oil and gas, in particular to a forming cup for processing rock samples and a method for measuring the volume of rock samples. Background technique [0002] In the oil and gas geological laboratory, during the determination of rock sample porosity, it is usually necessary to obtain (measure or calculate) two of the three parameters of rock sample total volume, rock sample solid volume, and pore volume, and calculate the rock sample according to the definition of porosity Porosity. Among them, the volume of the rock sample entity is an important parameter that is often measured. [0003] The gas method is generally used to measure the volume of rock samples. This method has been used for many years and has a lot of successful experience. The instrument composition, working principle and measurement process of the gas method for measuring the volume of entities are as follo...

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Problems solved by technology

[0022] (2) Sometimes limited by the total amount of samples, the obtained rock samples are small in size and irregular spherical in appearance, etc.

[0023] After these rock samples are placed in the sample chamber, one situation is that it is difficult to place another standard block, resulting in a large remaining space in the sample chamber; shape, the remaining space in the sample chamber is still large

In these two cases, in the process of measuring the volume of the entity by the gas method, the equilibrium pressure is very small, and it often exceeds the range where the equilibrium pressure has a good linear relationship with the volume of the entity (even beyond the linear range of the pressure sensor, resulting in the measurement of the equilibrium pressure. Accuracy is reduced), resulting in a decrease in the accuracy of rock sample entity volume measurement

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