A kind of fracture-cavity carbonate rock artificial core and its preparation method

Abstract

The invention discloses an artificial rock core of fracture-cavity type carbonate rock. The artificial rock core is prepared from the following raw materials: a fracture-cavity casting body, a bicarbonate solution and carbon dioxide, wherein the fracture-cavity casting body is a model obtained by melting and casting field-selected fracture-cavity type carbonate rock into a fracture cavity and pouring a material with chemical corrosion resistance and heat resistance into the fracture cavity; the heat resistance of the material with chemical corrosion resistance and heat resistance poured into the fracture cavity is 115-130 DEG C. The invention also discloses a preparation method of the artificial rock core of the fracture-cavity type carbonate rock. The artificial rock core of the fracture-cavity type carbonate rock is depended on a real fracture-cavity system casting body, has growth characteristics and arrangement modes of pores, karst caves and cracks in accordance with the reservoir reality, and is conductive to the study on the physical difference and fluid flowing discipline of the real reservoir.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a fracture-cavity carbonate rock artificial core and a preparation method thereof. Background technique [0002] Fractured-cavity carbonate reservoir is a new type of carbonate reservoir with large caves, cave channels and fracture zones as storage space and flow space. Such fracture-cavity reservoirs are widely distributed in the world, and the developed fractures, dissolved pores and caves are good oil and gas accumulation areas and oil and gas flow channels. The existing experimental methods have limitations such as being greatly affected by the size of the sample and the representativeness of the sample is not good. Due to the high cost of manual coring, the limited amount of coring, and the strong heterogeneity of fractured-cavity carbonate rocks, it is difficult to obtain a comprehensive understanding of the reservoir properties by conventional core analysis, and it is diff...

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Problems solved by technology

[0003] At present, the method of making artificial cores of fractured-vuggy carbonate rocks is mainly to add artificially drawn or prepared caves, cracks, and pores to carbonate rocks or calcium carbonate powder, and then add certain cements to press them. The size and mutual configuration of caves, fractures, and pores in the reservoir are manually determined, which cannot reflect the randomness and complexity of the fracture-cave system in the actual reservoir, and the strength of the obtained artificial core is also difficult to meet the requirements of high-pressure experiments or acid fracturing experiments.