Core holding unit based on Zeiss MCT-400 CT scanning and application thereof
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A core holder and holder technology, applied in the field of core holders, can solve the problems of X-ray scanning the internal core and the inability to obtain the core pore structure, etc., to achieve the effect of ensuring accuracy and accurate CT scanning results
Inactive Publication Date: 2015-01-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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In order to further observe the internal structure of pores, it is necessary to rely on CT non-destructive scanning technology, and the wall material of the core holder used in normal laboratories is stainless steel, X-rays cannot scan the internal core through the wall, and the combination of the two cannot obtain the core under different stresses. Pore Structure
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Embodiment 1
[0030] A core holder based on Zeiss MCT-400CT scanning, including a holder housing, is characterized in that the holder housing 1 is a carbon fiber tube that can withstand confining pressure.
[0031] The parameters of the carbon fiber tube are: the density is 1.26~1.34g / cm 3 , tensile strength ≥ 73MPa, Brinell hardness ≥ 10. The carbon fiber tube is a carbon fiber resin composite material, which is a commercially available material, which is polysulfone, an amorphous transparent or translucent polymer with a slight amber color, excellent mechanical properties, and has the advantages of high rigidity, wear resistance, and high strength. .
[0032] The tensile strength of the carbon fiber tube is ≥3500MPa.
[0033] The tensile elastic modulus of the carbon fiber tube is 230-430GPa.
Embodiment 2
[0035] A method for using the rock core holder as described in embodiment 1, comprising the following steps:
[0036] 1) Install the rock core in the rock core holder, keep the inlet pressure value of the rock core holder unchanged, slowly increase the confining pressure of the rock core holder, so that the net confining pressure is sequentially raised to the following pressure points: P1 , P2, P3, P4, P5, P6, P7; P1
[0037] 2) After each pressure point of the net confining pressure described in step 1) lasts for 30 minutes, measure the rock sample permeability according to the provisions of the People's Republic of China Petroleum and Natural Gas Industry Standards, and put it into a CT machine for fixedly performing core scanning;
[0038] 3) Slowly reduce the confining pressure to reduce the net confining pressure to the following pressure points P7, P6, P5, P4, P3, P2, and P1 in turn;
[0039] 4) After each pressur...
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Abstract
A core holding unit based on Zeiss MCT-400 CT scanning comprises a holding unit shell and is characterized in that the holding unit shell is a carbon fiber tube capable of bearing confining pressure. According to the parameters of the carbon fiber tube, the density ranges from 1.26 g/cm<3> to 1.34 g/cm<3>, the tensile strength is larger than or equal to 73 MPa, and the Brinell hardness is larger than or equal to 10. The carbon fiber tube is made of a carbon fiber and resin composite material, and the carbon fiber and resin composite material is sold on the market and is polysulfone which is an amorphous transparent or semitransparent polymer with slight amber, and the amorphous-type transparent or translucent polymer is excellent in mechanical property and has the advantages of being high in rigidity, resistant to abrasion, high in strength and the like. The shell of the core holding unit is the carbon fiber tube which is a microcrystalline graphite material obtained by performing carbonization and graphitization on organic fibers, the microcrystalline graphite material is a new material excellent in mechanical property, the specific gravity of the new material is smaller than 1/4 that of steel, the tensile strength of the carbon fiber and resin composite material is larger than 3500 MPa in general and is 7 times to 9 times that of steel, the tensile elasticity modulus ranges from 230 GPa to 430 GPa and is also higher than that of steel, and it can be guaranteed that X rays can penetrate through a wall surface, and it can also be guaranteed that the wall surface will not deform along with changes of experimental pressure.
Description
technical field [0001] The invention relates to a core holder based on Zeiss MCT-400CT scanning and an application thereof, belonging to the field of physical experiment equipment for oil and gas experiments. Background technique [0002] During the development of unconventional oil and gas reservoirs, the productivity is directly affected by the permeability of porous media, and the permeability of the medium depends on its microscopic pore structure. The microscopic pore structure of tight media changes with formation pressure, thus affecting the flow ability of fluids in it. This change in formation pressure causes changes in the microscopic pore structure and macroscopic permeability of the medium, which in turn affects the productivity of oil and gas wells, which is called the pressure-sensitive effect. In oil and gas reservoirs in tight media, the pores and throats are extremely small, and the seepage resistance is very large. The pressure sensitivity damage caused by...
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