Middle-permeability sandstone simulation core and preparation method thereof

Abstract

The invention discloses a middle-permeability sandstone simulation core for a laboratory physical simulation experiment and a preparation method thereof. The middle-permeability sandstone simulation core comprises the following components in part by weight: 100 parts of quartz sand with the particle size of between 250 and 420mu m, 200 to 500 parts of quartz sand with the particle size of between56 and 74mu m, and 9 to 30 parts of bentonite. The preparation method comprises the following steps of: mixing the three kinds of materials according to the design requirements of the simulation core, stirring uniformly to obtain a core base material, adding filtered mine injection water for the experiment into the core base material which is mixed and stirred uniformly so as to moisten the core base material, filling into a core barrel, compacting, adding the filtered mine injection water to saturate a core, and standing. Through the test on the water phase permeability, all results obtainedthrough the test are within the middle-permeability range; and the middle-permeability simulation core is provided for laboratory physical experiments. The invention changes methods for preparing a dry base material and knocking outside a pipe for the conventional simulation core, and ensures that the permeability of the simulation core is within the middle-permeability range.

Description

technical field [0001] The invention belongs to supplies and a preparation method for indoor physical simulation experiments, in particular to a medium-permeable sandstone simulation core and a preparation method thereof, which are used in indoor physical simulation experiments. Background technique [0002] In the oil recovery laboratory of the petroleum industry, when doing indoor physical simulation experiments, it is necessary to fill simulated cores with a certain permeability with quartz sand for experiments. The preparation of simulated cores is usually made by filling dry quartz sand with a minimum particle size of 74-56 μm and a single particle size by beating outside the core tube. However, the prepared simulated cores all have a permeability above 500 mD. The larger the particle size of the quartz sand, the greater the permeability of the filled sandstone core. The "Reservoir Engineering Basic Knowledge Manual" [M] volume published by Petroleum Industry Press in ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide medium permeable sandstone simulated core and its preparation method, to solve the problem that the medium permeable sandstone core cannot be prepared with the smallest dry quartz sand with a single particle size in the existing physical simulation test, and to provide medium permeable sandstone for laboratory experiments simulated core

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