Preparation method of artificial rock core for simulating permafrost region hydrate stratum skeleton

Abstract

The invention discloses a preparation method of an artificial rock core for simulating a permafrost region hydrate stratum skeleton. The method comprises the following steps: S1: acquiring the components, grain composition, density, porosity and permeability of a stratum to be simulated; S2: determining the range of the proportion of base sand to a conditioning agent according to the components of the stratum to be simulated, and determining the grain composition of the base sand according to the grain composition of the stratum; S3: setting a rock core size, and determining the use amount of the base sand and the conditioning agent according to the set rock core size and the density of the stratum to be simulated; S4: with the porosity and the permeability as target values, setting the influence factors and the level values of the target values, and designing an orthogonal test formula graph; and S5: according to the orthogonal test formula graph, pressing the rock core in a compression molding way. The rock core prepared by the preparation method approaches the real permafrost region natural gas hydrate stratum in basic physical parameters, and the pore distribution approaches the normal distribution characteristics of the real stratum, therefore, the method is conductive to large-batch production for comparison and repeated test.

Description

technical field [0001] The invention relates to an unconventional energy natural gas hydrate reservoir simulation experiment technology, in particular to an artificial core preparation method for simulating a hydrate formation framework in a permafrost region. Background technique [0002] With the increasing consumption of the world's conventional energy reserves and the rapid growth of human demand for energy, it is imminent to find new alternative energy sources. Among them, natural gas hydrate, as a new type of high-efficiency energy, has become a hot spot in global energy and environmental research, and is known as a strategic resource with commercial development prospects in the 21st century. [0003] Since the natural gas hydrate is widely distributed in the permafrost and ocean regions of the world, it is very difficult to mine, so the mining technology requires high requirements. When researching on the exploration and production technology of hydrate formations, i...

AI Technical Summary

Problems solved by technology

Since the matching with the basic physical parameters of hydrate formations including: permeability, porosity, mechanical strength and other parameters is generally not considered in the production process, the core obtained by manual filling and pressing is compared with the real gas hydrate formation: The mechanical strength is low, easy to loosen, and it is easy to cause blockage of the instrument pipeline; the basic physical parameters such as core permeability and porosity are greatly different from those of the in-situ formation and the repeatability is low, which is not conducive to the conduct of comparative experiments and repeated experiments

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