Method for producing artificial rock core by using freezing drilling technology

An artificial core and drilling technology, which is applied in the preparation of test samples and other directions, can solve the problems of inability to meet design requirements such as specific particle size composition, clay composition and content, high mining and transportation costs, and difficulty in obtaining permeability cores.
CN106370486AActive Publication Date: 2017-02-01CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2017-02-01

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Abstract

The invention provides a method for producing an artificial rock core by using a freezing drilling technology. The method comprises: 1, designing a rock core model formula, and determining the ratios of quartz sands having different particle sizes to clay; 2, carrying out sand material filling and compacting; 3, freezing the compacted model, taking out, immediately carrying out liquid nitrogen rock core drilling, and freezing the rock core again; and 4, taking out the frozen rock core, encapsulating, pressurizing, and finally drying the sample so as to spare. According to the present invention, with the method, the research requirements in the oil reservoir seepage flow mechanism can be completely met, the advantages of various artificial rock core production methods in the prior art are summarized, and the main physical parameters of the oil reservoir rock can be completely simulated.
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Description

technical field

[0001] The invention relates to the technical field of oil field development, in particular to a method for making artificial rock cores by using freeze drilling technology. Background technique

[0002] Natural oil reservoir rocks have two forms: solid (cement) bonded and loose. Usually, the pore structure is relatively complex, and the inner wall of the pore is relatively rough, filled with various clay minerals. There are large pore throats of hundreds of microns, and some are less than one hundredth of a micron Small pore throat, wide range of permeability; various components of the rock are complex, long-term contact with crude oil and water, its wettability is hydrophilic, neutral and oil-wet, and it is non-uniform wet, with mixed wet, patchy wet wet characteristics.

[0003] At present, there are many methods for artificially making cores. According to the characteristics of cores, there are mainly aluminum phosphate cores, epoxy resin cores, and arti...

Claims

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