A kind of preparation method of artificial rock core and the prepared artificial rock core
An artificial core and core technology, which is applied in the preparation, sampling, and instrumentation of test samples, can solve the problems of inability to simulate the diagenetic process of real cores, and the complex diagenetic process, achieving easy learning and promotion, fast and effective preparation methods, and simple operation. Effect
Active Publication Date: 2020-11-06
PETROCHINA CO LTD
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Problems solved by technology
Conventional artificial core production is to add a certain amount of water to glass beads or quartz sand in proportion, after mixing, put it into a triaxial pressurized equipment under certain temperature and pressure conditions for compaction, and use this method to produce The obtained artificial core has certain defects: it cannot simulate the diagenetic process of the real core, because the diagenetic process of the real rock is very complicated, mainly including compaction, cementation, dissolution, etc., and the artificial core prepared by the above method can only simulate the compaction Diagenetic
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Embodiment 1
[0038] This embodiment provides a kind of preparation method of artificial rock core, and the process flow diagram of this preparation method is as follows figure 1 shown, from figure 1 It can be seen that it includes the following steps:
[0039] Step (1): Select a core sample in a certain area to simulate and make an artificial core sample, and determine that the formation water in this area is calcium chloride type formation water, and its salinity is 1000mg / L. The formation depth is 2800m, and the overburden pressure is about 56MPa.
[0040] Component analysis and particle size analysis were carried out on the core sample, and it was determined that the core sample was quartz sandstone, wherein the weight content of quartz was 90%, the weight content of clay minerals was 6%, and the cement was mainly calcium carbonate, with a content of 4%; The particle size distribution of the quartz mineral particles is 0.01-0.05mm accounting for 10wt%, 0.05-0.1mm accounting for 50wt%,...
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The invention provides a preparation method of an artificial core and the artificial core prepared with the method. The method comprises steps as follows: a to-be-simulated real core is subjected to component analysis and size analysis, and components forming the real core, the content of each component and component size distribution information are obtained; an artificial core sampling materialand mineralized water are mixed uniformly according to the information and poured into a core mold; wherein the type and the mineralization degree of the mineralized water are the same as those of formation water of the area where the real core is located; calcium hydroxide is added to the core mold and stirred uniformly, and soda water is guided at a constant speed; after a calcium carbonate production reaction ends, pressure is applied to the core mold, so that a material in the mold is completely compacted and solidified; after the material in the core mold is completely compacted and solidified, hydrochloric acid is poured into the mold, so that calcite-cemented carbonate minerals in the artificial core and hydrochloric acid have a sufficient reaction, and the artificial core is obtained after the reaction ends.
Description
technical field [0001] The invention relates to a method for preparing an artificial rock core and the prepared artificial rock core, which belong to the technical field of petroleum and geological exploitation. Background technique [0002] Artificial cores have developed into an important object of core analysis in the field of petroleum and geological technology. Artificial cores have the following advantages: (1) samples can be prepared according to actual core needs; Core analysis must be replaced by artificial cores. Conventional artificial core production is to add a certain amount of water to glass beads or quartz sand in proportion, after mixing, put it into a triaxial pressurized equipment under certain temperature and pressure conditions for compaction, and use this method to produce The obtained artificial core has certain defects: it cannot simulate the diagenetic process of the real core, because the diagenetic process of the real rock is very complicated, mai...
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IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 公言杰柳少波赵孟军卓勤功鲁雪松
Owner PETROCHINA CO LTD