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A kind of artificial rock core with multiple pore structure and its preparation method

An artificial core and pore structure technology, applied in the preparation of test samples, etc., can solve problems such as large differences in complex distribution, difficulty in realization, human health and environmental safety hazards, etc., to reduce the experimental cycle and cost, and improve experimental efficiency , good repeatability

Active Publication Date: 2015-09-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, for rocks with multiple pore structures that contain secondary pores such as cracks and dissolved pores in addition to intergranular pores, such as carbonate rocks, the simulation core technology is not yet mature, and the method is relatively simple; and the artificial cores are often only Can be used for experimental testing of a certain physical property
[0006] There are many reports on the preparation methods of artificial cores with multiple pore structures for acoustic testing, such as thin section combination method (Cao Jun et al., 2004; Hao Shouling et al., 2004), block cutting method (Li Qiong et al., 2006), casting method (Ass'ad et al. et al., 1992; Wei Jianxin, 2002; Bi Quangui et al., 2009; Wang et al., 2012), etc., the main problems of these methods are: (1) The acoustic characteristics of the artificial core skeleton are quite different from the real core, The simulation results need to be converted according to the theoretical model before they can be used in engineering practice, and whether this conversion is reasonable remains to be explored; (2) The adjustment of pore size is limited, and the pore structure is limited to simple combinations. For complex pore structures, the core preparation process becomes more complex. complex or even difficult to achieve
This method can control the dissolution pore parameters well, but it is difficult to control the fracture parameters (shape, size, thickness, quantity, inclination, etc.), and the experimental test results obtained from the artificial core are not convenient for quantitative analysis; the dissolution pores and fractures are limited to one In-plane and connected to each other, it is quite different from the complex distribution of the actual core; the organic matter used in the preparation process is harmful to human health and environmental safety

Method used

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  • A kind of artificial rock core with multiple pore structure and its preparation method
  • A kind of artificial rock core with multiple pore structure and its preparation method
  • A kind of artificial rock core with multiple pore structure and its preparation method

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preparation example Construction

[0054] Preparation and screening of metal flakes and inorganic salt particles:

[0055] The pore aspect ratio (AR) refers to the ratio of the length of the short axis of the pore to the length of the long axis, and is an important parameter to describe the shape of the pore. Select aluminum foil paper with a thickness of 0.02mm, and use punches of different diameters to process the aluminum foil paper into discs with diameters of 3mm, 6mm, and 8mm, and the corresponding aspect ratios are 0.0067, 0.0033, and 0.0025 (such as figure 2 shown).

[0056] Select large pieces of sea salt, obtain sodium chloride particles through mechanical crushing and grinding, and use screens of different particle sizes to screen out sodium chloride particles with different particle size distributions. image 3 The particle size distribution of the sodium chloride particles shown is 1mm, (3~4)mm, (4~5)mm.

Embodiment 1

[0058] Take the preparation of fractured-porous sandstone artificial core as an example. The size of the designed artificial core is a standard core with a diameter of 25mm and a length of 50mm, and the volume V is 39.27cm 3 , where the microcrack size d is 3 mm, the aspect ratio AR is 0.0067, and the crack density ε is 0.0495. The number n of the circular thin iron sheets (AR=0.0067) with diameter d=3mm and thickness h=0.02mm is 45 in total, and the mass of 45 thin iron sheets is m 1 It is 0.0496g to simulate cracks. Weigh 60g of carbonate rock cuttings with a particle size of 200μm, 1.538g of epoxy resin, 0.462g of curing agent, and 0.769g of diluent. Mix sandstone cuttings with epoxy resin binder evenly. The mixture was added to the mold in 5 times on average, and during this process, thin iron sheets were picked up with tweezers and embedded randomly in the mixture one by one. After all the artificial core preparation materials are added to the mold, the mold is placed...

Embodiment 2

[0060] Take the preparation of dissolved pore-pore type double pore structure carbonate rock artificial core as an example. The design core size is 25mm in diameter, 50mm in length, standard core; the size of dissolved pores is 3mm, and the number of dissolved pores is 75. Screen 75 sodium chloride granules with a particle size of 3mm, mass m 2 It is 4.35g. Weigh 60 g of carbonate rock cuttings with a particle size of 200 μm, 0.923 g of epoxy resin, 0.277 g of curing agent, and 0.462 g of diluent. Mix the carbonate rock cuttings with the epoxy resin binder evenly, then add the screened sodium chloride particles, and mix evenly. Add the mixture to the mold and apply an axial pressure of 6MPa. At room temperature, after 12 hours, the epoxy resin binder has fully cured, and the mold is removed. Soak the formed artificial core in distilled water at 45°C and weigh it every half hour. After the quality of the core remains basically unchanged, stop soaking, and the artificial co...

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Abstract

The invention discloses a man-made rock core with a multi-pore structure and a preparation method of the man-made rock core. The preparation method comprises the following steps: preparing rock debris, inorganic salt particles and thin metal sheets; uniformly mixing the rock debris with an epoxy resin cementing agent; when adding a mixture into a mould, randomly embedding the designed inorganic salt particles and / or the thin metal sheets; solidifying; detaching the mould and taking out the man-made rock core; immersing the man-made rock core in distilled water and dissolving the inorganic salt particles to form dissolving holes; immersing or leaching the rock core by corresponding acid or alkali to form cracks; and finally, washing the man-made rock core with distilled water, and drying to obtain the man-made rock core with the multi-pore structure. According to the man-made rock core provided by the invention, the cracks and dissolving hole parameters of the rock core can be quantitatively controlled; the obtained man-made rock core is very similar with a natural rock core, so as to provide high-quality, low-cost and pollution-free experimental materials for simulation and test of physical properties including waves, seepage, conductivity and the like of rock.

Description

technical field [0001] The invention relates to an artificial rock core for simulating porous rock and a preparation method thereof, belonging to the technical field of analysis and measurement control. It can be used as an experimental core for experimental research on rock microscopic seepage mechanism, acoustic characteristics, electrical characteristics, etc., and can also be used to evaluate the impact of different oil and gas recovery technologies (such as surfactant flooding, water flooding, polymer flooding, etc.) on reservoirs with multiple pore structures. layer effectiveness. Background technique [0002] Underground rocks are porous media, and in addition to intergranular pores, cracks and dissolved pores are often developed; generally, intergranular pores are primary pores, and cracks and dissolved pores are secondary pores. The pore network composed of these different types of pores is an important oil and gas storage space and seepage channel. Multiple pore ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 王子振王瑞和邱浩李天阳单珣
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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