Measuring device and measuring method for effective porosity of shale core

Abstract

The invention discloses a measuring device and a measuring method for the effective porosity of shale cores. The measuring device includes: a vacuuming unit, a core holder, a confining pressure unit, an intermediate container, an injection unit and a control acquisition unit; wherein, one end of the core holder is connected with the vacuuming unit, and the other end is connected with the intermediate container; The pressing unit is connected to the core holder; the other end of the intermediate container is connected to the injection unit; the control acquisition unit is connected to the injection unit for collecting data of the injection unit. The advantages are that the measuring device of the present invention has a simple structure and is convenient for real-time assembly, the measuring method realized by the device is simple and accurate, and the effective porosity of the rock sample under the condition of the oil and gas reservoir can be measured non-destructively.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, and more particularly, 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 fluids, and is one of the important parameters in the study of reservoir physical properties. It can be used in oil and gas reservoir evaluation and reserves calculation. Shale oil and gas exploration and development 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 determination of shale porosity, especially the determination of rock porosity under actual oil and gas reservoir conditions, is of great significance to the exploration,...

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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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