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Method for making small temperature swing adsorption curve for coalbed methane drainage

A technology of temperature swing adsorption and manufacturing method, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of misjudgment and error in the evaluation of commercial exploitation potential of coalbed methane

Inactive Publication Date: 2019-07-30
XIAN SIYUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large number of experiments have confirmed that the influence of adsorption temperature on the Langer volume VL and the Langer pressure PL is not linear, so the calculation of the Langer parameter at the actual temperature of the coal reservoir by the difference method will inevitably produce certain errors, and further affect the coal seam. The evaluation of the commercial exploitation potential of natural gas will produce different degrees of misjudgment

Method used

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  • Method for making small temperature swing adsorption curve for coalbed methane drainage
  • Method for making small temperature swing adsorption curve for coalbed methane drainage
  • Method for making small temperature swing adsorption curve for coalbed methane drainage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] see Figure 1-2 , the following will be explained with specific examples:

[0032] Taking Shanxi Nanyu Mine Fatty Coal (NY) as an example: Using the existing pressure-temperature adsorption equation, the characteristic The geometric constant A of fat coal, the adsorption flow coefficient B representing the adsorption surface of fat coal, the parameter to measure the influence of temperature on the adsorption amount of fat coal, and the parameter to measure the influence of pressure on the adsorption amount of fat coal are shown in Table 1-Table 2:

[0033] Table 1 Basic properties of fat coal and coal isothermal adsorption results under equilibrium water conditions

[0034]

[0035] Table 2 The basic properties of fat coal and the parameters of the pressure-temperature adsorption equation in the range of 30°C-50°C

[0036] serial number sampling location coal rank A B NY Shanxi Nanyu Mine Fat coal 0.168 0.002031 953.3 0.5342

...

Embodiment 2

[0061] Taking the fertilizer coal (NY) of Nanyu Mine in Shanxi as an example, it is operated in the coal field of Nanyu Mine of Shanxi. Although it is known that coal is fat coal and has a 30°C isothermal adsorption Rankine volume V L and Langley pressure P L and 50°C isothermally adsorbed Rankine volume V l and Langley pressure P l , its basic properties and isothermal adsorption are listed in Table 1 in the above-mentioned embodiment one. However, the temperature of the coal reservoir measured on site is indeed 40°C, while the temperature of the coalbed methane wellbore is 37°C. Calculate and make 37 ℃-40 ℃ small temperature swing adsorption curve by the method step of the present invention, this method comprises the following steps:

[0062] Step S1, setting the temperature of the coal reservoir as the upper limit temperature.

[0063] According to the actual situation, since the temperature of the coal reservoir measured on site is 40°C, that is, the upper limit tempe...

Embodiment 3

[0083] Taking lean coal (XS) of Xiangshan Mine in Shaanxi as an example: using the existing pressure-temperature adsorption equation, the characteristic lean coal The geometric constant A of the , the adsorption flow coefficient B representing the adsorption surface of lean coal, the parameter to measure the influence of temperature on the adsorption capacity of lean coal, and the parameter to measure the influence of pressure on the adsorption capacity of lean coal, as shown in Table 3-Table 4:

[0084] Table 3 Basic properties of lean coal and coal isothermal adsorption results under equilibrium water conditions

[0085]

[0086] Table 4 The basic properties of lean coal and the parameters of the pressure-temperature adsorption equation in the range of 30°C-50°C

[0087] serial number sampling location coal rank A B XS Shaanxi Xiangshan Mine lean coal 0.168 0.002059 1149.5 0.4644

[0088] Table 3 lists the basic properties of lean coa...

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Abstract

The invention provides a method for making a small temperature swing adsorption curve for coalbed methane drainage. The method comprises the steps: the coal reservoir temperature is set as the upper limit temperature; the coalbed methane shaft temperature is set as the lower limit temperature; the upper limit adsorption pressure is set to be M MPa; the lower limit absorption pressure is set to beN MPa; the temperature and pressure swing ratio of small temperature swing adsorption is calculated; according to the lower limit absorption pressure, the lower limit temperature and the temperature and pressure swing ratio, temperature values of centigrade temperatures after the adsorption pressure of one unit is increased each time are calculated, and the M-N sets of temperature values are obtained; the calculated temperature values are converted into thermodynamic temperatures (K) from the centigrade temperatures (DEG C); and the M-N sets of thermodynamic temperatures and corresponding adsorption pressure values are substituted into a coal pressure temperature adsorption equation, and the adsorption quantity is obtained; and the small temperature swing adsorption curve is made. Comparedwith relevant technologies, coalbed methane represented by the small temperature swing adsorption curve made by the method for making the small temperature swing adsorption curve for coalbed methanedrainage corresponds with the actual situation better, practicability is high, and the accuracy degree is high.

Description

technical field [0001] The invention relates to the field of small temperature swing adsorption curve preparation methods, in particular to a small temperature swing adsorption curve preparation method for coal bed gas extraction. Background technique [0002] Coalbed methane is a hydrocarbon gas that occurs in coal reservoirs, with methane as the main component, and is mainly adsorbed on the surface of coal matrix particles. The surface extraction of coalbed methane refers to the operation of drilling a well on the ground of the coal reservoir to a predetermined depth (passing through the coal reservoir) for the extraction of coalbed methane. The water in the coal reservoir is confined water. There are many cracks and joints between the coal reservoir and the CBM wellbore that can be used as seepage channels for confined water. The production of coalbed methane is achieved by pumping water from the coalbed methane wellbore to reduce the pressure of the coal reservoir, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/12
CPCE21B43/121
Inventor 李东张学梅马青华郝静远
Owner XIAN SIYUAN UNIV
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