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Method for making artificial rock core by freezing drilling technology

An artificial core and drilling technology, applied in the preparation of test samples, etc., can solve the problems of failure 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, etc.

Active Publication Date: 2019-03-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Its pore structure is similar to that of reservoir rocks, but its mining and transportation costs are high, and its physical properties are naturally formed. It cannot meet the design requirements of specific particle size composition, clay composition and content, and the permeability of outcrop cores obtained so far is relatively low. It is difficult to obtain cores with permeability higher than 1000 mD

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  • Method for making artificial rock core by freezing drilling technology
  • Method for making artificial rock core by freezing drilling technology
  • Method for making artificial rock core by freezing drilling technology

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Embodiment Construction

[0029] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0030] Such as figure 1 as shown, figure 1 It is a flow chart of the method for making artificial rock cores by utilizing freeze drilling technology of the present invention.

[0031] In step 101, a core model recipe is designed. In this step, according to the physical parameters of the target reservoir, such as particle size composition, clay composition and content, the ratio of quartz sand with different particle sizes to clay is determined, and wettability treatment is performed on the surface of the quartz sand according to the wettability characteristics of the reservoir.

[0032] In step 102, packing and compaction of sand material is performed. In this step, according to the amount of quartz sand and clay, an appropriate amount of water is a...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 张红欣杨海博张以根许坚房会春王磊贾刚刘津陈亚宁张礼臻李继山张玉利
Owner CHINA PETROLEUM & CHEM CORP
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