CN109902348A - Method for calculating medium-grade coal adsorption gas quantity based on vitrinite maximum reflectivity - Google Patents
Method for calculating medium-grade coal adsorption gas quantity based on vitrinite maximum reflectivity Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 126
- 239000004079 vitrinite Substances 0.000 title claims abstract description 57
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000002310 reflectometry Methods 0.000 title abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims description 82
- 230000000274 adsorptive effect Effects 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009933 burial Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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Abstract
The invention provides a method for calculating the adsorption gas quantity of medium-grade coal based on the maximum reflectivity of vitrinite, which comprises the following steps: calculating an adsorption flow coefficient B of the adsorption surface according to the vitrinite maximum reflectivity of the coal sample; calculating parameters of the influence of the temperature on the adsorption capacity according to the maximum reflectivity of the vitrinite of the coal sample; calculating parameters of the influence of pressure on the adsorption capacity according to the vitrinite maximum reflectivity of the coal sample: calculating the temperature in centigrade of the adsorption temperature according to the buried depth of the coal sample and the corresponding geothermal gradient, and converting into the thermodynamic adsorption temperature K; calculating adsorption pressure P according to the burial depth of the coal sample and the corresponding ground pressure gradient; substituting the data obtained by the calculation and the geometric shape constant A into a pressure-temperature adsorption equation to obtain the adsorption gas quantity of the medium-coal-grade coal. Compared with the related technology, the method for calculating the medium-grade coal adsorption gas quantity based on the maximum reflectivity of the vitrinite is easy to learn, use, efficient and high in accuracy.
Description
Technical field
The present invention relates to the method fields of rank coal absorption tolerance in calculating, more particularly to one kind.
Background technique
Middle coal rank coal measures refers to maximum reflectance of vitrinite (R0, max) and between 0.65%~2.50%, including China
Northeast, North China, south China and bottle coal the owning to meager coal in southwest Mesozoic Era and late Paleozoic Main Coalfields or coal-bearing region
Bituminous coal.
Coal bed gas be preservation in coal seam using methane as main component, to be adsorbed on the coal seam based on matrix of coal particle surface
The Unconventional gas of self-generation, self-reservoir itself.The main geologic of coal bed gas content is controlled because being known as: rank of coal metamorphism buries depth
Degree, Seam Roof And Floor lithology and rift structure situation etc..Wherein rank of coal metamorphism plays the effect of essence internal cause, and buries depth
Spending (different buried depth has different temperatures and different pressures) is then important external cause action.
Vitrinite reflectance is both to study source rock of oil gas in the important indicator and petroleum geology exploration for characterize degree of coalification
The important evidence of maturity and ground thermal change.Because vitrinite reflectance influenced by incoalation it is more sensitive always, because
This is both at home and abroad all using the reflectivity of desmocollinite as the index of mark degree of coalification (coal rank).
Langmuir isothermal adsorpting equation indicates to inhale under isothermal conditions with two parameters (Lan Shi volume, Lan Shi pressure)
The relationship of attached amount and adsorptive pressure.Because temperature is not the independent variable of Langmuir isothermal adsorpting equation, the influence of temperature is logical
It crosses the size for comparing the Parameters variation of the Lan Shi under different temperatures and change direction and obtains indirectly.Understand fully that essence internal cause acts on
Quantitative relationship between (rank of coal metamorphism) and important external cause action (different temperatures, different pressures) is to simulation different buried depth (temperature
Degree, pressure) under the conditions of different ranks saturation absorption tolerance, inquire into pressure and temperature centering rank coal adsorbed methane ability it is comprehensive
Effect is closed, rank coal absorption tolerance is of practical significance in prediction.
Compare the Lan Shi volume V at two adjacent temperature using calculus of finite differencesLWith Lan Shi pressure PLSize and change direction
On condition that influence of the temperature to the two parameters is linear.But a large amount of experiment confirms adsorption temp to Lan Shi volume VLWith
Lan Shi pressure PLInfluence be not error that is linear, therefore can generating certain.Relevant calculating simultaneously is indirectly that this also makes
At be not easy using.Pressure and temp adsoption equation is linked together not yet with maximum reflectance of vitrinite simultaneously and is calculated
The method of middle rank coal absorption tolerance.
Therefore, it is necessary to provide a kind of new method based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating
To solve the above problems.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of easily study, easily use, efficiently and accuracy it is high based on
The method of rank coal absorption tolerance in maximum reflectance of vitrinite calculating.
To solve the above problems, the present invention provides one kind based on rank coal adsorbed gas in maximum reflectance of vitrinite calculating
The method of amount takes middle rank coal as coal sample, and this method comprises the following steps:
Step S1, the absorption flow coefficient B of absorption surface is calculated according to the maximum reflectance of vitrinite of coal sample:
Step S2, the parameter that temperature influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample:
Step S3, the parameter that pressure influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample:
Step S4, the Celsius temperature DEG C of adsorption temp is calculated according to the buried depth of coal sample and its corresponding geothermal gradient, and changed
It is counted as Adsorption thermodynamics temperature K:
K=273+ DEG C.
Step S5, adsorptive pressure P is calculated according to the buried depth of coal sample and its corresponding pressure gradient.
Step S6, will calculate above the resulting absorption flow coefficient B, the parameter that the temperature influences adsorbance,
Parameter, the Adsorption thermodynamics temperature K, adsorptive pressure P and the geometrical body constant A that the pressure influences adsorbance are substituted into such as
Lower pressure temperature adsorption equation obtains rank coal dry ash free basis coal bed gas under the conditions of the equilibrium water of specific buried depth in this kind
Absorption tolerance:
Wherein, V is absorption tolerance, unit cm3/g；M is molecular weight, and the molecular weight of methane is 16；T is thermodynamic temperature K；
P is adsorptive pressure, unit megapascal；A is geometrical body constant；B is the absorption flow coefficient of absorption surface；Δ is to measure temperature pair
The parameter that adsorbance influences；β is the parameter measuring pressure and influencing on adsorbance.
Preferably, the geometrical body constant A=0.168.
Preferably, further include following steps before step S1: step S0, establishing original middle rank coal experimental data base, wrap
Include maximum reflectance of vitrinite, test temperature, test pressure and absorption tolerance.
Preferably, the coal sample of the middle rank coal is 1200 meters of reservoir buried depth with shallow.
Preferably, the maximum reflectance of vitrinite R0,maxBetween 0.65%~2.50%.
Compared with the relevant technologies, the method for the invention based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating
Calculated equilibrium water after the humidity and pressure of reservoir is calculated according to the depth of reservoirs of rank coal in target, pressure gradient, geothermal gradient
Under the conditions of dry ash free basis coal bed gas absorption tolerance, export calculated result, directly calculated with maximum reflectance of vitrinite in coal rank
Coal is in 1200 meters of reservoir buried depth with shallow absorption tolerance, and this method easily learns, easily uses, efficiently and accuracy is high.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, in which:
Fig. 1 is the flow chart element of the invention based on the method for rank coal absorption tolerance in maximum reflectance of vitrinite calculating
Figure.
Fig. 2 is computational representation in the method for the invention based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating
The curve graph of the natural logrithm of the absorption flow coefficient B of middle rank coal absorption surface.
Fig. 3 is to calculate to measure in the method for the invention based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating
The curve graph for the parameter that temperature centering rank coal adsorbance influences；
Fig. 4 is to calculate in the method for the invention based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating
Measure the curve graph for the parameter that pressure centering rank coal adsorbance influences.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
It please join shown in figure, the present invention provides a kind of based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating
Method takes middle rank coal as coal sample, and this method comprises the following steps:
Step S0, original middle rank coal experimental data base, including maximum reflectance of vitrinite, test temperature, test are established
Pressure and absorption tolerance.This step is conventional steps.It is mainly used for providing maximum reflectance of vitrinite in experimental data base,
Above-mentioned parameter is calculated using existing pressure and temp adsoption equation.If maximum reflectance of vitrinite determines, this step can be saved.This
In the method for invention, the coal sample of the middle rank coal is 1200 meters of reservoir buried depth with shallow (20 DEG C~50 DEG C, 1~12 megapascal), institute
State maximum reflectance of vitrinite R0,maxBetween 0.65%~2.50%.
Step S1, the absorption flow coefficient B that absorption surface is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 2
It is shown:
Step S2, the parameter that temperature influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 3 institute
Show:
Step S3, the parameter that pressure influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 4 institute
Show:
Step S4, the Celsius temperature DEG C of adsorption temp is calculated according to the buried depth of coal sample and its corresponding geothermal gradient, and changed
It is counted as Adsorption thermodynamics temperature K:
K=273+ DEG C.
Step S5, adsorptive pressure P is calculated according to the buried depth of coal sample and its corresponding pressure gradient.
Step S6, will calculate above the resulting absorption flow coefficient B, the parameter that the temperature influences adsorbance,
Parameter, the Adsorption thermodynamics temperature K, adsorptive pressure P and the geometrical body constant A that the pressure influences adsorbance are substituted into such as
Lower pressure temperature adsorption equation obtains rank coal dry ash free basis coal bed gas under the conditions of the equilibrium water of specific buried depth in this kind
Absorption tolerance:
Wherein, V is absorption tolerance, unit cm3/g；M is molecular weight, and the molecular weight of methane is 16；T is thermodynamic temperature K；
P is adsorptive pressure, unit megapascal；A is geometrical body constant, in the present invention, A=0.168；B is the absorption flow of absorption surface
Coefficient；Δ is the parameter measuring temperature and influencing on adsorbance；β is the parameter measuring pressure and influencing on adsorbance.
In the specific embodiment of the invention, if earth's surface zone of constant temperature temperature is 15 DEG C, by 3 DEG C/100 meters of normal geothermal gradient, ground
The Hydrostatic pressure gradient of layer water, i.e. pressure gradient, 1 megapascal/100 meter:
Embodiment one
The maximum reflectance of vitrinite R of rank coal in certain0, max=0.8, reservoir buried depth is 900 meters, calculates coal in this
The method of grade coal absorption tolerance is as follows:
Step S1, the absorption flow coefficient B that absorption surface is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 2
It is shown:
Then absorption flow coefficient B=0.0000002574 of absorption surface.
Step S2, the parameter that temperature influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 3 institute
Show:
The then parameter that temperature influences adsorbance.
Step S3, the parameter that pressure influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 4 institute
Show:
Then parameter=0.5166 that pressure influences adsorbance.
Step S4, the Celsius temperature DEG C of adsorption temp T is calculated according to the buried depth of coal sample and its corresponding geothermal gradient, and changed
It is counted as Adsorption thermodynamics temperature K:
K=273+ DEG C；
Then T=42 DEG C, it is converted into Adsorption thermodynamics temperature K=315.
Step S5, adsorptive pressure P=9 megapascal is calculated according to the buried depth of coal sample and its corresponding pressure gradient.
Step S6, will calculate above the resulting absorption flow coefficient B, the parameter that the temperature influences adsorbance,
Parameter, the Adsorption thermodynamics temperature K, adsorptive pressure P and the geometrical body constant A that the pressure influences adsorbance are substituted into such as
Lower pressure temperature adsorption equation obtains rank coal dry ash free basis coal bed gas under the conditions of the equilibrium water of specific buried depth in this kind
Absorption tolerance:
Wherein, V is absorption tolerance, unit cm3/g；M is molecular weight, and the molecular weight of methane is 16；T indicates thermodynamic temperature
K；P is adsorptive pressure, unit megapascal；A is geometrical body constant, in the present invention, A=0.168；B is the absorption stream of absorption surface
Coefficient of discharge；Δ is the parameter measuring temperature and influencing on adsorbance；β is the parameter measuring pressure and influencing on adsorbance；
Then dry ash free basis coal bed gas absorption tolerance V=6.45cm under the conditions of the equilibrium water of rank coal in this kind3/g。
Embodiment two
The maximum reflectance of vitrinite R of rank coal in certain0, max=1.2, reservoir buried depth is 1000 meters, calculates coal in this
The method of grade coal absorption tolerance is as follows:
Step S1, the absorption flow coefficient B that absorption surface is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 2
It is shown:
Then absorption flow coefficient B=0.0000228 of absorption surface.
Step S2, the parameter that temperature influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 3 institute
Show:
The then parameter that temperature influences adsorbance.
Step S3, the parameter that pressure influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 4 institute
Show:
Then parameter=0.4142 that pressure influences adsorbance.
Step S4, the Celsius temperature DEG C of adsorption temp T is calculated according to the buried depth of coal sample and its corresponding geothermal gradient, and changed
It is counted as Adsorption thermodynamics temperature K:
K=273+ DEG C；
Then T=45 DEG C, it is converted into Adsorption thermodynamics temperature K=318.
Step S5, adsorptive pressure P=10 megapascal is calculated according to the buried depth of coal sample and its corresponding pressure gradient.
Step S6, will calculate above the resulting absorption flow coefficient B, the parameter that the temperature influences adsorbance,
Parameter, the Adsorption thermodynamics temperature K, adsorptive pressure P and the geometrical body constant A that the pressure influences adsorbance are substituted into such as
Lower pressure temperature adsorption equation obtains rank coal dry ash free basis coal bed gas under the conditions of the equilibrium water of specific buried depth in this kind
Absorption tolerance:
Wherein, V is absorption tolerance, unit cm3/g；M is molecular weight, and the molecular weight of methane is 16；T indicates thermodynamic temperature
K；P is adsorptive pressure, unit megapascal；A is geometrical body constant, in the present invention, A=0.168；B is the absorption stream of absorption surface
Coefficient of discharge；Δ is the parameter measuring temperature and influencing on adsorbance；β is the parameter measuring pressure and influencing on adsorbance；
Then dry ash free basis coal bed gas absorption tolerance V=11.80cm under the conditions of the equilibrium water of rank coal in this kind3/g。
Embodiment three
The maximum reflectance of vitrinite R of rank coal in certain0, max=1.6, reservoir buried depth is 1200 meters, calculates coal in this
The method of grade coal absorption tolerance is as follows:
Step S1, the absorption flow coefficient B that absorption surface is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 2
It is shown:
Then absorption flow coefficient B=0.0003056 of absorption surface.
Step S2, the parameter that temperature influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 3 institute
Show:
The then parameter that temperature influences adsorbance.
Step S3, the parameter that pressure influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample, in conjunction with Fig. 4 institute
Show:
Then parameter=0.3505 that pressure influences adsorbance.
Step S4, the Celsius temperature DEG C of adsorption temp is calculated according to the buried depth of coal sample and its corresponding geothermal gradient, and changed
It is counted as Adsorption thermodynamics temperature K:
K=273+ DEG C；
Then T=51 DEG C, it is converted into Adsorption thermodynamics temperature K=324.
Step S5, adsorptive pressure P=12 megapascal is calculated according to the buried depth of coal sample and its corresponding pressure gradient.
Step S6, will calculate above the resulting absorption flow coefficient B, the parameter that the temperature influences adsorbance,
Parameter, the Adsorption thermodynamics temperature K, adsorptive pressure P and the geometrical body constant A that the pressure influences adsorbance are substituted into such as
Lower pressure temperature adsorption equation obtains rank coal dry ash free basis coal bed gas under the conditions of the equilibrium water of specific buried depth in this kind
Absorption tolerance:
Wherein, V is absorption tolerance, unit cm3/g；M is molecular weight, and the molecular weight of methane is 16；T indicates thermodynamic temperature
K；P is adsorptive pressure, unit megapascal；A is geometrical body constant, in the present invention, A=0.168；B is the absorption stream of absorption surface
Coefficient of discharge；Δ is the parameter measuring temperature and influencing on adsorbance；β is the parameter measuring pressure and influencing on adsorbance；
Then dry ash free basis coal bed gas absorption tolerance V=17.27cm under the conditions of the equilibrium water of rank coal in this kind3/g。
Compared with the relevant technologies, the method for the invention based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating
Calculated equilibrium water after the humidity and pressure of reservoir is calculated according to the depth of reservoirs of rank coal in target, pressure gradient, geothermal gradient
Under the conditions of dry ash free basis coal bed gas absorption tolerance, export calculated result, directly calculated with maximum reflectance of vitrinite in coal rank
Coal is in 1200 meters of reservoir buried depth with shallow absorption tolerance, and this method easily learns, easily uses, efficiently and accuracy is high.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (5)
1. it is a kind of based on maximum reflectance of vitrinite calculate in rank coal absorption tolerance method, take middle rank coal as coal sample,
This method comprises the following steps:
Step S1, the absorption flow coefficient B of absorption surface is calculated according to the maximum reflectance of vitrinite of coal sample:
Step S2, the parameter that temperature influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample:
Step S3, the parameter that pressure influences adsorbance is calculated according to the maximum reflectance of vitrinite of coal sample:
Step S4, the Celsius temperature DEG C of adsorption temp is calculated according to the buried depth of coal sample and its corresponding geothermal gradient, and be converted into
Adsorption thermodynamics temperature K:
K=273+ DEG C；
Step S5, adsorptive pressure P is calculated according to the buried depth of coal sample and its corresponding pressure gradient；
Step S6, the resulting absorption flow coefficient B, parameter that the temperature influences adsorbance, described will be calculated above
Parameter, the Adsorption thermodynamics temperature K, adsorptive pressure P and the geometrical body constant A that pressure influences adsorbance are substituted into as pushed
Power temperature adsorption equation obtains rank coal dry ash free basis coal bed gas under the conditions of the equilibrium water of specific buried depth in this kind and adsorbs
Tolerance:
Wherein, V is absorption tolerance, unit cm3/g；M is molecular weight, and the molecular weight of methane is 16；T is thermodynamic temperature K；P is to inhale
Enclosure pressure, unit megapascal；A is geometrical body constant；B is the absorption flow coefficient of absorption surface；Δ is to measure temperature to absorption
Measure the parameter influenced；β is the parameter measuring pressure and influencing on adsorbance.
2. the method according to claim 1 based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating, special
Sign is, the geometrical body constant A=0.168.
3. the method according to claim 1 based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating, special
Sign is, further includes following steps before step S1:
Step S0, original middle rank coal experimental data base, including maximum reflectance of vitrinite, test temperature, test pressure are established
And absorption tolerance.
4. the method according to claim 1 based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating, special
Sign is that the coal sample of the middle rank coal is 1200 meters of reservoir buried depth with shallow.
5. the method according to claim 4 based on rank coal absorption tolerance in maximum reflectance of vitrinite calculating, special
Sign is, the maximum reflectance of vitrinite R0,maxBetween 0.65%~2.50%.
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Application publication date: 20190618 |