Preparation method of crack type carbonate rock core

Abstract

The invention discloses a preparation method of a crack type carbonate rock core. The preparation method comprises the steps of firstly, mixing calcium carbonate powder, epoxy resin and an EP (Epoxy Resin) curing agent in a ratio, then pressing and curing to form a square rock board; then cutting the rock board by using an automatic slicing machine along different directions to form cracks with different shapes; and finally, drilling rock cores at different crack angles in the rock board with the cracks by using a rock core drilling machine. The prepared rock cores are basically equal in matrix porosity and permeability, and different in crack number and directions, and thus the demand on a crack type rock core exploitation simulation experiment can be met.

Description

technical field [0001] The invention relates to the technical field of artificial rock core production in oil and gas field development, in particular to a fractured carbonate core preparation technology developed for reservoir development simulation experiments. Background technique [0002] Fractured oil reservoirs occupy a considerable proportion in the world. For this type of reservoir, the matrix porosity and permeability are generally small, and fractures become important seepage and storage spaces. However, due to the complex distribution of fractures in the reservoir, its flow mechanism is very complicated, and the development effect is not ideal, and even some reserves have not been developed or the development effect is very poor. Therefore, the research on this type of reservoir is of great significance. However, the natural fractured core is not easy to drill because of its fragility, and the artificial fracture technology is not mature enough, so the physical e...

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Problems solved by technology

Using the method of mechanical destruction to create fractures, the success rate is low, and the formed fractures are relatively random, which cannot be described by exact parameters; although cutting fractures do not have this defect, the core of the cutting part will be missing, and the original shape cannot be maintained , so the core needs to be filled, but the filler used cannot be exactly the same as the matrix core; the multi-plate composite fracture can only prepare a flat physical model, but cannot form a cylindrical core, and the shape of the formed fracture is relatively simple. The matrix permeability cannot be controlled according to the requirements: only one core can be prepared at a time by adding gaskets, and the matrix porosity and permeability of each core cannot be guaranteed to be the same, and carbonates will decompose under high temperature conditions

Moreover, most of the current artificial cemented cores use quartz sand as raw material, and carbonate rock artificial cores have not been reported yet.

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