CN107816335B - Method and device for determining lower limit of coal bed gas content development - Google Patents
Method and device for determining lower limit of coal bed gas content development Download PDFInfo
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- CN107816335B CN107816335B CN201610821955.2A CN201610821955A CN107816335B CN 107816335 B CN107816335 B CN 107816335B CN 201610821955 A CN201610821955 A CN 201610821955A CN 107816335 B CN107816335 B CN 107816335B
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- 238000011161 development Methods 0.000 title claims abstract description 80
- 239000003245 coal Substances 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011160 research Methods 0.000 claims abstract description 144
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000009792 diffusion process Methods 0.000 claims abstract description 38
- 238000001179 sorption measurement Methods 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 238000003795 desorption Methods 0.000 claims abstract description 23
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims description 12
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- 230000035699 permeability Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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Abstract
The invention provides a method and a device for determining a lower limit of coal bed gas content development. The method comprises the following steps: obtaining the loss pressure of methane of each single well in the research area from diffusion and seepage to the bottom of the well based on the coal bed gas critical desorption pressure and the actual gas production pressure of each single well in the research area; obtaining the lower limit of the gas content development of each single well in the research area based on the pressure lost from the methane of each single well in the research area to the bottom of the well through diffusion and seepage and the corresponding isothermal adsorption curve of each single well in the research area; and calculating to obtain the gas content development lower limit of the research area based on the gas content development lower limits of all the single wells in the research area. The method and the device for determining the lower limit of the gas content development of the coalbed methane provided by the invention determine the lower limit of the gas content development of the research area based on the data of all single wells in the research area, can provide a basis for calculating the exploitable area and the geological reserve of the coalbed methane reservoir in the research area, and reduce calculation errors.
Description
Technical Field
The invention relates to the technical field of coal bed gas development, in particular to a method and a device for determining a lower limit of coal bed gas content development.
background
The lower limit of gas content development is an important parameter for calculating the development area and the reserve of the high-coal-rank coal bed gas field, and has very important significance for evaluating the coal reservoir and determining a coal bed gas development scheme. The high-coal-rank coal bed gas reservoir has the characteristics of low saturation, low porosity, low permeability, low daily output of a single well and the like, and the development technology difficulty is high. In the coal bed gas exploration and development, in order to accurately define a developable area, calculate the developable gas reservoir area and the geological reserve and make development policy research particularly important, the determination of the low development limit of the gas content of the high-coal-rank coal bed gas is of great significance.
In the current development process of coal bed gas wells in China, the lower limit of the development of the coal bed gas content is mainly determined by referring to the highest allowable gas content value of the safe production of coal.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
Different coal bed gas field geological conditions are different, and the coal bed gas content development lower limit determined by referring to the highest allowable gas content of coal safety production has deviation, so that the difference between the exploitable area and the geological reserve calculated according to the gas content development lower limit is larger than the actual difference.
Disclosure of Invention
in order to solve the technical problem, the invention provides a method and a device for determining a lower limit of coal bed gas content development. In particular, the method of manufacturing a semiconductor device,
The invention provides a method for determining the lower limit of the exploitation of the gas content of coal bed gas, which comprises the following steps:
obtaining the loss pressure of methane of each single well in the research area after diffusion and seepage to the bottom of the well based on the coal bed gas critical desorption pressure of each single well in the research area and the actual gas production pressure of each single well in the research area;
Obtaining the lower development limit of the gas content of each single well in the research area based on the pressure lost by methane of each single well in the research area after diffusion and seepage to the bottom of the well and the isothermal adsorption curve of each single well in the research area;
And calculating to obtain the gas content development lower limit of the research area based on the gas content development lower limits of all the single wells in the research area.
Optionally, the pressure loss of methane from each individual well in the investigation region via diffusion and seepage to the bottom of the well is modeled as:
Pl＝Pwf-Pcd
in the formula:
P l -pressure loss of methane by diffusion, seepage to the bottom of the well;
p wf -critical desorption pressure of coal bed gas;
P cd — actual gas pressure.
optionally, the critical desorption pressure of the coal bed gas of each single well in the research area is obtained according to the gas content measured by a coal core test and the isothermal adsorption curve of each single well in the research area, and the actual gas production pressure of each single well in the research area is read through the drainage and production data of each single well in the research area.
Optionally, the obtaining a lower exploitation limit of the gas content of each individual well in the research area based on the pressure lost by diffusion, seepage to the bottom of the well and the isothermal adsorption curve of each individual well in the research area comprises:
and the gas content corresponding to the pressure lost from the diffusion and seepage of methane of each single well to the bottom of the well in the research area on the corresponding isothermal adsorption curve of each single well in the research area is the lower limit of the gas content development of each single well in the research area.
optionally, the lower gas content development limit for the study area is the arithmetic mean of the lower gas content development limits for all individual wells in the study area.
the invention also provides a device for determining the lower limit of the exploitation of the gas content of the coal bed gas, which comprises the following components:
the first acquisition module is used for solving the loss pressure of methane of each single well in a research area after diffusion and seepage to the bottom of the well based on the coal bed gas critical desorption pressure of each single well in the research area and the actual gas production pressure of each single well in the research area;
The second acquisition module is used for obtaining the lower development limit of the gas content of each single well in the research area based on the pressure loss of methane of each single well in the research area from diffusion and seepage to the bottom of the well and the isothermal adsorption curve of each single well in the research area;
And the calculation module is used for calculating and obtaining the gas content development lower limit of the research area based on the gas content development lower limits of all the single wells in the research area.
Optionally, the first obtaining module obtains the pressure loss of methane from each single well in the research area to the bottom of the well through diffusion and seepage by using a model:
Pl＝Pwf-Pcd
in the formula:
p l -pressure loss of methane by diffusion, seepage to the bottom of the well;
P wf -critical desorption pressure of coal bed gas;
p cd — actual gas pressure.
Optionally, the critical desorption pressure of the coal bed gas of each single well in the research area is obtained according to the gas content measured by a coal core test and the isothermal adsorption curve of each single well in the research area, and the actual gas production pressure is read through the drainage and production data of each single well in the research area.
Optionally, the second obtaining module obtains a lower exploitation limit of the gas content of each single well in the research area based on the pressure loss of methane of each single well in the research area through diffusion and seepage to the bottom of the well and the isothermal adsorption curve of each single well in the research area, and includes:
and the gas content corresponding to the pressure lost from the diffusion and seepage of methane of each single well to the bottom of the well in the research area on the corresponding isothermal adsorption curve of each single well in the research area is the lower limit of the gas content development of each single well in the research area.
Optionally, the calculation module calculates the lower gas content development limit of the research area as an arithmetic mean of the lower gas content development limits of all the single wells in the research area.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
the invention provides a method and a device for determining the lower limit of the exploitation of the gas content of coal bed gas, which are used for solving the loss pressure of methane of each single well in a research area after diffusion and seepage to the bottom of the well based on the critical desorption pressure and the actual gas production pressure of the coal bed gas of each single well in the research area; on the basis, according to the isothermal adsorption curve of each single well, obtaining the lower limit of the gas content development of each single well in the research area; and calculating the gas content development lower limit of the research area based on the gas content development lower limits of all the single wells in the research area. Because the determination of the lower limit of the gas content development of the research area is determined based on the data of all the coal-bed gas wells in the research area, the method can provide a basis for calculating the exploitable area and the geological reserve of the coal-bed gas well in the research area, and reduce calculation errors.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining a lower limit of exploitation of gas content of coalbed methane in an embodiment of the present invention;
Fig. 2 is a block diagram of an apparatus for determining a lower limit of exploitation of gas content of coal bed methane in an embodiment of the present invention.
Detailed Description
in order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
Example one
The embodiment provides a method for determining a development lower limit of the gas content of coal bed methane, and as shown in fig. 1, the method comprises steps S101, S102 and S103. The steps are described in detail below.
Step S101: and (4) solving the loss pressure of methane of each single well in the research area from the diffusion and seepage to the bottom of the well based on the coal bed gas critical desorption pressure and the actual gas production pressure of each single well in the research area.
Specifically, the model for solving the pressure loss of methane from each single well in the research area to the bottom of the well through diffusion and seepage is as follows:
Pl＝Pwf-Pcd
In the formula:
p l -pressure loss of methane by diffusion, seepage to the bottom of the well;
P wf -critical desorption pressure of coal bed gas;
p cd — actual gas pressure.
the critical desorption pressure of the coal bed gas of each single well in the research area is obtained according to the gas content measured by a coal core test and the isothermal adsorption curve of each single well in the research area, and the actual gas production pressure of each single well in the research area is the bottom hole flowing pressure when the methane gas adsorbed in the original reservoir state starts to desorb in the coal bed gas extraction process and can be read through the extraction data of each single well in the research area.
Specifically, the pressure of the gas content of the single well in the research area measured according to the coal core test on the isothermal adsorption curve of the single well is the coal bed gas critical desorption pressure of the single well.
it should be noted that the method for measuring the gas content through the coal core test and obtaining the actual gas production pressure through the drainage data is well known to the technicians in the coal bed gas industry, and the detailed description of the invention is omitted. In addition, the isothermal adsorption curve of a single well is obtained by a coal core test, which is well known to those skilled in the art, and the present invention will not be described in detail.
Step S102: and obtaining the lower development limit of the gas content of each single well in the research area based on the pressure loss of methane of each single well in the research area to the bottom of the well through diffusion and seepage and the isothermal adsorption curve of each single well in the research area.
Specifically, the gas content corresponding to the pressure lost from the diffusion and seepage of methane in each single well to the bottom of the well in the isothermal adsorption curve of each single well in the research area is the lower limit of the gas content development of each single well.
step S103: and calculating to obtain the gas content development lower limit of the research area based on the gas content development lower limits of all the single wells in the research area.
Specifically, the arithmetic mean of the lower gas content development limits of all the single wells in the research area is calculated, and the obtained result is the lower gas content development limit of the research area.
When the exploitable area is selected and the exploitable area and the reserve volume are calculated in the research area, the gas content of the reservoir cannot be lower than the gas content development lower limit of the research area, otherwise, the exploitable area and the reserve volume obtained through calculation are large, and meanwhile, the gas is not produced by the area development well of which the coal bed gas reserve volume is lower than the gas content development lower limit of the research area.
For example, the lower gas content development limits of all wells in the XX research area of the domestic X basin are respectively 12m 3/t, 17m 3/t, 15m 3/t, 15m 3/t, 15m 3/t, 18m 3/t, 18m 3/t, 18m 3/t, 10m 3/t and 17m 3/t, then the lower gas content development limit of the research area is the arithmetic mean value of the lower gas content development limits of all wells, and then the lower gas content development limit of the research area is (12+17+15+15+15+18+18 +10+17)/10 is 15.5m 3/t).
then, in the X basin XX research area in China, when a developable area is selected and the developable area and the reserve are calculated, the gas content of a reservoir cannot be lower than 15.5m 3/t, otherwise, the calculated developable area and the reserve are large, and meanwhile, the development well in the area with the coal bed gas reserve lower than 15.5m 3/t does not produce gas.
According to the method for determining the lower limit of the gas content development of the coal bed gas, based on the critical desorption pressure and the actual gas production pressure of the coal bed gas of each single well in the research area, the loss pressure of methane of each single well in the research area from diffusion and seepage to the bottom of the well is obtained, and then the lower limit of the gas content development of each single well is obtained by combining the isothermal adsorption curve of each single well. And calculating the arithmetic mean value of the gas content development lower limits of all the single wells in the research area, namely the gas content development lower limit of the research area. Because the determination of the lower limit of the gas content development of the research area is determined based on the data of all the coal-bed gas wells in the research area, the method can provide a basis for calculating the exploitable area and the geological reserve of the coal-bed gas well in the research area, and reduce calculation errors.
the method for determining the development lower limit of the gas content of the coal bed gas provided by the invention can be used for determining the development lower limit of the gas content of the high-coal-rank coal bed gas, but is not limited to the determination.
example two
corresponding to the first embodiment, the present embodiment provides an apparatus for determining a lower limit of exploitation of a gas content of a coal bed methane, as shown in fig. 2, including:
The first obtaining module 201 is configured to obtain a loss pressure of methane from each single well in the research area to a bottom of the well through diffusion and seepage based on the critical desorption pressure and the actual gas production pressure of the coal bed gas of each single well in the research area.
Specifically, the first obtaining module obtains an obtaining model of the pressure loss of methane of each single well in the research area from diffusion and seepage to the bottom of the well as the following steps:
Pl＝Pwf-Pcd
in the formula:
P l -pressure loss of methane by diffusion, seepage to the bottom of the well;
P wf -critical desorption pressure of coal bed gas;
p cd — actual gas pressure.
the critical desorption pressure of the coal bed gas of each single well in the research area is obtained according to the gas content measured by a coal core test and the isothermal adsorption curve of each single well in the research area, and the actual gas production pressure is read through the discharge and production data of each single well in the research area.
specifically, the pressure, measured by each single well in the research area according to the coal core test, of the gas content of the single well corresponding to the isothermal adsorption curve of the single well is the coal bed gas critical desorption pressure of the single well.
It should be noted that the method for measuring the gas content through the coal core test and obtaining the actual gas production pressure through the drainage data is well known to the technicians in the coal bed gas industry, and the detailed description of the invention is omitted. In addition, the isothermal adsorption curve of a single well is obtained by a coal core test, which is well known to those skilled in the art, and the present invention will not be described in detail.
and a second obtaining module 202, configured to obtain a lower gas content development limit of each single well in the research area based on a pressure loss of methane of each single well in the research area after diffusion and seepage to a bottom of the well and an isothermal adsorption curve of each single well in the research area.
Specifically, the pressure of the methane loss from each single well to the bottom of the well after diffusion and seepage in the research area is the corresponding pressure on the isothermal adsorption curve of each single well, which is the lower limit of the gas content development of each single well.
And the calculating module 203 is configured to calculate the lower limit of the gas content development of the research area based on the lower limit of the gas content development of all the single wells in the research area.
specifically, the arithmetic mean of the gas content development lower limits of all the single wells in the research area is calculated, and the obtained result is the gas content development lower limit of the research area.
when the exploitable area is selected and the exploitable area and the coal bed gas reserve are calculated, the gas content of the reservoir cannot be lower than the gas content exploitation lower limit of the research area, otherwise, the exploitable area and the reserve obtained through calculation are large, and meanwhile, the exploitation well of the area with the coal bed gas reserve lower than the gas content exploitation lower limit of the research area does not produce gas.
since the second embodiment corresponds to the first embodiment, the same advantageous effects can be brought, and are not described herein again.
in the embodiments provided in the present application, it should be understood that the method and apparatus provided are merely illustrative, for example, the division of the steps and modules is only one logical function division, and other division manners may be available in actual implementation. The method and the device can be realized by running corresponding software and hardware through a computer device. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. a method for determining the lower limit of the exploitation of the gas content of coal bed gas is characterized by comprising the following steps:
Obtaining the loss pressure of methane of each single well in the research area after diffusion and seepage to the bottom of the well based on the coal bed gas critical desorption pressure of each single well in the research area and the actual gas production pressure of each single well in the research area;
obtaining the lower development limit of the gas content of each single well in the research area based on the pressure lost by methane of each single well in the research area after diffusion and seepage to the bottom of the well and the isothermal adsorption curve of each single well in the research area;
calculating to obtain the gas content development lower limit of the research area based on the gas content development lower limit of all the single wells in the research area;
The model for solving the pressure loss of methane of each single well in the research area to the bottom of the well through diffusion and seepage is as follows:
Pl＝Pwf-Pcd
In the formula:
P l -pressure loss of methane by diffusion, seepage to the bottom of the well;
P wf -critical desorption pressure of coal bed gas;
p cd — actual gas production pressure;
The critical desorption pressure of the coal bed gas of each single well in the research area is obtained according to the gas content measured by a coal core test and the isothermal adsorption curve of each single well in the research area, and the actual gas production pressure of each single well in the research area is read through the drainage and production data of each single well in the research area.
2. The method for determining the lower exploitation limit of the gas content of coal bed methane according to claim 1, wherein the obtaining of the lower exploitation limit of the gas content of each single well in the research area based on the pressure loss of methane of each single well in the research area through diffusion and seepage to the bottom of the well and the isothermal adsorption curve of each single well in the research area comprises:
And the gas content corresponding to the pressure lost from the diffusion and seepage of methane of each single well to the bottom of the well in the research area on the corresponding isothermal adsorption curve of each single well in the research area is the lower limit of the gas content development of each single well in the research area.
3. The method of determining a lower gas content exploitation limit of a coalbed methane according to claim 1, wherein the lower gas content exploitation limit of the research area is an arithmetic mean of the lower gas content exploitation limits of all single wells in the research area.
4. A coal bed gas content development lower limit determination device is characterized by comprising:
The first acquisition module is used for solving the loss pressure of methane of each single well in a research area after diffusion and seepage to the bottom of the well based on the coal bed gas critical desorption pressure of each single well in the research area and the actual gas production pressure of each single well in the research area;
the second acquisition module is used for obtaining the lower development limit of the gas content of each single well in the research area based on the pressure loss of methane of each single well in the research area from diffusion and seepage to the bottom of the well and the isothermal adsorption curve of each single well in the research area;
The calculation module is used for calculating and obtaining the gas content development lower limit of the research area based on the gas content development lower limits of all the single wells in the research area;
the first acquisition module is used for acquiring the pressure loss of methane of each single well in the research area from diffusion and seepage to the bottom of the well by adopting an acquisition model as follows:
Pl＝Pwf-Pcd
In the formula:
P l -pressure loss of methane by diffusion, seepage to the bottom of the well;
P wf -critical desorption pressure of coal bed gas;
p cd — actual gas production pressure;
the critical desorption pressure of the coal bed gas of each single well in the research area is obtained according to the gas content measured by a coal core test and the isothermal adsorption curve of each single well in the research area, and the actual gas production pressure is read through the discharge and production data of each single well in the research area.
5. The device for determining the lower limit of the development of the gas content in the coal bed methane according to claim 4, wherein the second obtaining module obtains the lower limit of the development of the gas content in each single well in the research area based on the pressure of methane loss of each single well in the research area through diffusion and seepage to the bottom of the well and the isothermal adsorption curve of each single well in the research area, and comprises:
And the gas content corresponding to the pressure lost from the diffusion and seepage of methane of each single well to the bottom of the well in the research area on the corresponding isothermal adsorption curve of each single well in the research area is the lower limit of the gas content development of each single well in the research area.
6. The device for determining the lower limit of the development of the gas content in the coal bed methane according to claim 4, wherein the lower limit of the development of the gas content in the research area calculated by the calculation module is an arithmetic mean of the lower limits of the development of the gas content in all the single wells in the research area.
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