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A device and method for measuring the competitive adsorption of carbon dioxide and alkanes in shale

A carbon dioxide, competitive adsorption technology, used in measurement devices, suspension and porous material analysis, instruments, etc., can solve the problems of low shale permeability, complex device structure, long test time, etc.

Inactive Publication Date: 2019-07-30
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can treat supercritical CO 2 and CH 4 Competitive adsorption is tested in porous media, but the structure of the device is complicated. Since the change of the composition needs to be analyzed constantly by the gas chromatograph, when the composition reaches a stable state, the adsorption reaches equilibrium. During the operation, the composition of the long core mixture needs to be constantly checked For testing, the operation process is more complicated and the test cost is higher
At the same time, this device can only use long cores as porous media materials, but the shale has a high soil content and the cores are fragile. Limited by the field conditions of the oilfield, it is usually difficult to obtain long cores, and the shale permeability is low, and the mixture In it, the transfer is slow (especially alkanes), and the test time is long, which cannot meet the needs of field application in oil fields

Method used

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  • A device and method for measuring the competitive adsorption of carbon dioxide and alkanes in shale
  • A device and method for measuring the competitive adsorption of carbon dioxide and alkanes in shale
  • A device and method for measuring the competitive adsorption of carbon dioxide and alkanes in shale

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] Weigh the skeleton density as ρ=2.5155g / cm 3 of shale particles m 0 =25.00g, the particle size is 200 mesh, put it into volume v 0 =52.8ml reaction vessel 8 tops, by weighing the first three-way joint 201, the 5th shut-off valve 105 and oil-gas separator 4 and its pipeline quality is m 1 =180.326g, and according to figure 1 connection shown. After vacuuming the shale particles, add n-dodecane m to the intermediate container 8 respectively h =9.10g, CO 2 mass m g =0.85g, the pressure of the reaction vessel 8 is controlled by the metering pump 2 to be 8.00MPa. Set the temperature of the temperature control system to 60°C. After the system is adsorbed and balanced, the volumes of the metering pump 2 at the initial moment and the equilibrium moment are respectively v 1 = 0ml, v 2 =26.8ml, through the first three-way joint 201, the fifth shut-off valve 105 and the oil-gas separator 4, the gas-collecting measuring cylinder 3 with the scale and the pipeline with the se...

Embodiment 2

[0116] Weigh the skeleton density as ρ=2.5155g / cm 3 of shale particles m 0 =25.00g, the particle size is 200 mesh, put it into volume v 0 =52.8ml reaction vessel 8 tops, by weighing the first three-way joint 201, the 5th shut-off valve 105 and oil-gas separator 4 and its pipeline quality is m 1 =180.326g, and according to figure 1 connection shown. After vacuuming the shale particles, add n-dodecane m to the intermediate container 8 respectively h =9.27g, CO 2 mass m g =1.86g, the pressure of the reaction vessel 8 is controlled by the metering pump 2 to be 12.00MPa. Set the temperature of the temperature control system to 60°C. After the system is adsorbed and balanced, the volumes of the metering pump 2 at the initial moment and the equilibrium moment are respectively v 1 = 0ml, v 2 =30.6ml, through the first three-way joint 201, the fifth shut-off valve 105 and the oil-gas separator 4, the gas-collecting measuring cylinder 3 with the scale and the pipeline with the s...

Embodiment 3

[0118] Weigh the skeleton density as ρ=3.0408g / cm 3 The 13X type molecular sieve m0=20.00g, the particle diameter is 3.0mm, put it into the volume v 0 =52.8ml reaction vessel 8 tops, by weighing the first three-way joint 201, the 5th shut-off valve 105 and oil-gas separator 4 and its pipeline quality is m 1 =180.326g, and according to figure 1 connection shown. After vacuuming the shale particles, add n-dodecane m to the intermediate container 8 respectively h =20.01g, CO 2 mass m g =1.02g, the pressure of the reaction vessel 8 is controlled by the metering pump 2 to be 8.00MPa. Set the temperature of the temperature control system to 60°C. After the system is adsorbed and balanced, the volumes of the metering pump 2 at the initial moment and the equilibrium moment are respectively v 1 = 0ml, v 2 =18.38ml, through the first three-way joint 201, the fifth shut-off valve 105 and the oil-gas separator 4, the gas-collecting measuring cylinder 3 with the scale and the pipeli...

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Abstract

The invention discloses a device for measuring the competitive adsorption quantity of carbon dioxide and alkane in shale. The device is characterized in that a reaction container cover is arranged at the upper end of a reaction container; a piston is arranged in the reaction container; the reaction container cover is communicated with a second three-way joint; the second three-way joint is connected with a first three-way joint; the second three-way joint is connected with a third three-way joint; the third three-way joint is connected with a first storage tank; the third three-way joint is connected with a second storage tank; electronic scales are arranged below the second storage tank and the first storage tank; the lower end of the reaction container is connected with a four-way joint; the four-way joint is connected with a pressure sensor; the four-way joint is connected with a metering pump; a first three-way valve is connected with a vacuum pump; and the first three-way valve is connected with an oil gas separator and a gas meter sequentially. The device has the advantages that whether adsorption is balanced or not is rapidly judged through pressure change, the problem that a shale core is difficult to take is solvd, experimental operation is simple and rapid, and the device has important guiding significance in applying CO2 to develop a shale oil reservoir.

Description

technical field [0001] The invention relates to the field of petroleum engineering and technology, in particular to a device and method for measuring the competitive adsorption of carbon dioxide and alkanes in shale. Background technique [0002] China's conventional oil and gas resources are mainly distributed in onshore deep, ultra-deep, and onshore complex traps, while unconventional oil and gas resources such as shale oil and gas and coalbed methane are the most important strategic replacement resources in my country. Concentrated distribution in the continental strata of the region is an important strategic replacement resource. Shale oil is crude oil that is rich in organic shale formation systems (large sets of dark shale, high carbon shale, silty shale and sandstone interlayers), and its main storage space is pores and fractures , ultra-low porosity, ultra-low permeability and continuous reservoirs with no migration or very short migration distance. It is characteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/04G01N15/08
CPCG01N7/04G01N15/08G01N2015/0866
Inventor 董明哲朱超凡宫厚健李亚军李彦超尹丛彬
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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