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Physical fractured reservoir simulation method

A physical simulation and reservoir technology, applied in measuring devices, instruments, and nuclear magnetic resonance analysis, etc., can solve problems such as property gaps and large errors in crude oil production

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

The samples are mainly artificial sand-packing models or natural outcrop cores, which are different from real reservoir cores. At the same time, this method is limited by the placement density of saturation probes, and the quantitative research on the production of crude oil in fractures and matrix has large errors. Therefore, The above two physical simulation experiment methods cannot fully meet the requirements of fractured reservoir research

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specific Embodiment approach

[0020] According to a specific embodiment of the present invention, the fractured reservoir physical simulation method includes the following steps:

[0021] Step (1), select a representative rock core of the oil reservoir, dry the rock core, and vacuumize the core. The specific vacuuming method includes: placing the rock core in the core holder, and the core holder applies a certain confining pressure, usually 2MPa , Different holders are different, close one end of the holder, and connect the other end to a vacuum pump to evacuate, the vacuum degree is below 4Pa, then saturate the oil under the formation conditions, and use the injection pump to inject oil into the core holder after vacuuming The core is saturated, and the injection pressure is selected according to the experimental conditions. Usually, the confining pressure is always higher than the injection pressure by 2MPa, and different holders are different, and the nuclear magnetic resonance T2 spectrum test is used; ...

Embodiment 1

[0028] First, dry the tight sandstone core, vacuumize it, then saturate it with oil under formation conditions, and conduct nuclear magnetic resonance T2 spectrum test; wash the core with oil, apply shear force to the core with bench vise, and use ceramsite as support material, made into a core with fractures; vacuumize the core again, and saturate the oil under formation conditions, and perform the NMR T2 spectrum test; through the comparison of the two T2 spectra, determine the relaxation time of the signal that distinguishes the fracture from the crude oil in the matrix 220ms, such as figure 1 shown; use this core to carry out CO 2 Oil displacement experiment, the pressure difference is 0.4MPa, the experimental results are as follows figure 2 shown, for CO 2 The calculation of the crude oil in the fracture and matrix before and after oil displacement shows that the oil displacement efficiency in the fracture is 92.1%, and the oil displacement efficiency in the matrix is ...

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Abstract

The invention relates to a physical fractured reservoir simulation method. The physical fractured reservoir simulation method comprises the steps that a representative rock core of an oil reservoir is selected, drying and vacuumizing are performed, nuclear magnetic resonance T2 spectrum testing is conducted on saturated oil under formation conditions; the rock core is subjected to oil scrubbing treatment, and a shear force is exerted to form a crack; a non-metal supporting substrate is added to the formed crack according to the physical properties of a real reservoir to obtain a crack rock core; the manufactured crack rock core is dried and vacuumized, and nuclear magnetic resonance T2 spectrum testing is conducted on saturated oil under formation conditions; two nuclear magnetic resonance T2 spectra are compared; displacement experiments are performed, the T2 spectra of different displacement experiment processes are obtained through nuclear magnetic resonance testing, and further quantitative analysis is conducted on the respective usage situations of crude oil in the crack and crude oil in a matrix. By the adoption of the physical fractured reservoir simulation method, the properties of fractured reservoirs can be really reflected, quantitative research can be conducted on the respective usage situations of crude oil in cracks and matrixes, and powerful data support can be provided for development of fractured reservoirs.

Description

technical field [0001] The invention relates to a physical simulation method for fractured reservoirs, belonging to the field of experimental methods used in the field of oil and gas field development. Background technique [0002] Fractured reservoirs refer to reservoirs in which naturally occurring fractures have an important influence on fluid flow in the reservoir. As a special reservoir type, it has its unique complexity compared with porous reservoirs, that is, it has a dual-media structure, and the most common features are low porosity, high permeability, and strong heterogeneity. Mining is difficult. At the same time, with the development of tight oil and gas and shale oil and gas, a large number of fracturing stimulation measures have been implemented, resulting in a large number of fractures in the reservoir. [0003] Indoor physical simulation experiment is an important means to evaluate reservoir development characteristics. For fractured reservoirs, the proba...

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Application Information

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IPC IPC(8): G01N33/00G01N24/08
Inventor 吕成远潘伟义伦增珉郎东江王海涛赵春鹏赵清民周霞卢刚陈少华
Owner CHINA PETROLEUM & CHEM CORP