Shale core effective porosity measuring device and method

Abstract

The invention discloses a shale core effective porosity measuring device and method. The measuring device comprises a vacuumizing unit, a rock core holder, a confining pressure unit, an intermediate container, an injection unit and a control acquisition unit; wherein one end of the rock core holder is connected with the vacuumizing unit, and the other end of the rock core holder is connected withthe intermediate container; the confining pressure unit is connected to the rock core holder; the other end of the intermediate container is connected with the injection unit; and the control acquisition unit is connected to the injection unit and is used for acquiring data of the injection unit. The advantages of the invention are that the shale core effective porosity measuring device is simplein structure and convenient to assemble in real time, the shale core effective porosity measuring method realized by the device is simple and accurate, and the effective porosity of a rock sample under the condition of an oil-gas reservoir can be measured in a nondestructive mode.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, and more specifically relates to a measuring device and a measuring method for the effective porosity of shale cores. Background technique [0002] In the field of oil and gas field development technology, porosity reflects the storage capacity of porous media for fluid, and is one of the important parameters in the study of reservoir physical properties, which can be applied to oil and gas reservoir evaluation and reserve calculation. The exploration and development of shale oil and gas has become a hot spot in the world. my country has abundant unconventional shale oil and gas reserves, and the potential of recoverable resources ranks among the top in the world. With the rapid development of shale oil and gas, the accurate measurement of shale porosity, especially the determination of rock porosity under actual oil and gas reservoir conditions, is of great significance to ...

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Problems solved by technology

Among them, the helium method uses a helium porosimeter, and its measurement device is a sample cup with a fixed volume, and the core is placed in a container. This device cannot exert pressure on the rock overlying the formation, which is quite different from the conditions of oil and gas reservoirs; the sample of the nitrogen adsorption method is Pulverized samples, put the pulverized samples into the cavity container, and calculate the sample porosity by measuring the gas adsorption capacity. This device also cannot apply the overlying formation pressure to the rocks in it, and measures the total porosity of the sample, including Non-connected pore space; the mercury porosimetry uses a mercury porosimeter, the rock is placed in a sample tube, and the overlying pressure cannot be applied to the rock sample; the conventional saturated fluid method is to saturate the core in a suction filter bottle, which is passed through a balance under normal pressure The rock saturation is measured by weighing, which cannot reflect the porosity of the rock under the conditions of the oil and gas reservoir; the scanning electron microscope method is to quantitatively calculate the porosity of the rock through the focused ion beam scanning electron microscope, which measures the porosity of a local area, and it is difficult to measure the porosity of the rock as a whole. The porosity of shale rocks is measured above; the low-field NMR method uses NMR instruments to measure the porosity of rocks, and its measurement parameters are echo time and waiting time, which are based on the measurement parameters of conventional reservoirs. The porosity measured in this way Porosity is not the true value of shale porosity

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