CN103776713A - Gas desorption rate testing device for dense rock - Google Patents
Gas desorption rate testing device for dense rock Download PDFInfo
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- CN103776713A CN103776713A CN201410010190.5A CN201410010190A CN103776713A CN 103776713 A CN103776713 A CN 103776713A CN 201410010190 A CN201410010190 A CN 201410010190A CN 103776713 A CN103776713 A CN 103776713A
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- 238000003795 desorption Methods 0.000 title claims abstract description 57
- 239000011435 rock Substances 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 93
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 239000003245 coal Substances 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 133
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002528 anti-freeze Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention provides a gas desorption rate testing device for dense rocks, which consists of a gas desorption device, a gas volume measuring device and a computer; the gas desorption device comprises a rock core holder, a booster pump and a pressure gauge; the gas volume measuring device comprises a gas storage tank, a rubber hose, a mass measuring instrument, special liquid, a liquid storage tank and a film, wherein the gas storage tank stores the special liquid, and the liquid storage tank stores the special liquid; along with the annular pressure generated by the core holder, the gas in the rock sample is desorbed and is discharged to the gas storage tank through the valve, and the gas can discharge the special liquid in the gas storage tank to the liquid storage tank; the mass measuring instrument measures the weight of the discharged special liquid, the weight of the discharged special liquid is transmitted to the computer in real time through the data transmission line to record the weight of the discharged special liquid in real time, and the computer automatically calculates the volume of the discharged special liquid in real time when knowing the density of the special liquid; and calculating the desorption rate of the rock sample by the computer according to the volume of the special liquid discharged in real time.
Description
Technical Field
The invention relates to the technical field of exploration and development of shale gas and coal bed gas, in particular to the field of testing of gas desorption rate of shale gas and coal bed gas, and specifically relates to a testing device for gas desorption rate of shale gas and coal bed gas.
Background
Shale gas, coal bed gas is natural gas in an adsorbed, free or dissolved state which is present in shale or coal bed. In a conventional natural gas reservoir, generally, free gas and dissolved gas are mainly used, and basically, adsorbed gas is not absorbed, while in an unconventional natural gas reservoir such as shale and coal bed, the content of the absorbed gas is high, and the total amount of the absorbed gas and the free gas is generally more than 90%. The development prospect of shale gas and coal bed gas is directly related to the content of adsorbed gas and free gas, the gas desorption rate is directly related to the initial yield and the gas production decay rate in the later period, the evaluation of whether the shale gas or the coal bed gas in a certain area has a commercial prospect is influenced, accurate desorption rate evaluation data must be established, and the desorption rate data of the shale gas is used for gas reservoir simulation and production prediction. For this purpose, the gas content and desorption properties of the shale core or coal core must be known. Therefore, the shale gas/coal bed gas content testing equipment is particularly important in the exploration and development of shale gas and coal bed gas.
At present, a dense rock gas desorption rate testing device is not invented at home and abroad.
Disclosure of Invention
The embodiment of the invention provides a dense rock gas desorption rate testing device, which consists of a gas desorption device 101, a gas volume measuring device 102 and a computer 18, wherein the gas desorption device 101 is connected with the gas volume measuring device 102, and the gas volume measuring device 102 is connected with the computer 18; the gas desorption device 101 comprises a core holder 4, a booster pump 19 and a pressure gauge 5, wherein a rock sample 6 is stored in the core holder 4, the core holder 4 applies formation annular pressure to the rock sample 6 through the booster pump 19, and the pressure gauge 5 is used for testing the annular pressure of the core holder 4; the gas volume measuring device 102 comprises a gas storage tank 7, a rubber hose 14, a mass meter 13, special liquids 9 and 10, a liquid storage tank 8 and films 11 and 12, wherein the gas storage tank 7 stores the special liquid 9, and the liquid storage tank 8 stores the special liquid 10; along with the annular pressure generated by the core holder 4, the gas in the rock sample 6 is desorbed and is discharged to the gas storage tank 7 through the valve 1, and the gas can discharge the special liquid 9 in the gas storage tank 7 to the liquid storage tank 8; the mass meter 13 measures the weight of the discharged special liquid 9, the weight is transmitted to the computer 18 in real time through the data transmission line 17, the weight of the special liquid 9 discharged in real time is recorded, the density of the special liquid 9 is known, and the computer 18 automatically calculates the volume of the special liquid 9 discharged in real time; and the computer calculates the desorption rate of the rock sample according to the volume of the special liquid discharged in real time at different time intervals. The device for testing the gas desorption rate of the tight rock further comprises a gas collecting bottle 16 and an air pump 15, wherein the collecting bottle 16 is connected to the gas storage tank 7 through a valve 3, and the air pump 15 is connected to the liquid storage tank 8 through a valve 2; when all the special liquid 9 in the gas storage tank 7 is discharged into the liquid storage tank 8, the valve 2 and the valve 3 are opened, the gas pump 15 is used for inflating the liquid storage tank 8, the special liquid 10 is discharged into the gas storage tank 7, and the gas in the gas storage tank 7 is discharged into the collecting bottle 16.
Further, in one embodiment, the core sample 6 is a shale or coal core.
Further, in an embodiment, the specific liquid 9, 10 is an anti-freezing liquid.
Further, in an embodiment, the gas desorption device 101 and the gas volume measuring device 102 are multiple and correspond to each other one by one, so that the desorption rates of multiple rock samples can be measured simultaneously.
The testing device for testing the gas desorption rate of shale gas/coal bed gas provided by the embodiment of the invention not only can measure the mass of liquid discharged by the gas storage tank by using the mass meter and realize the measurement of the gas volume by obtaining the volume of the liquid through the known density of the liquid, but also can record the volume of gas desorbed by rock samples at different time intervals through the computer so as to obtain the desorption rate of the rock gas, thereby providing basic data for researching the gas storage capacity of shale and coal beds in a certain area in time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a dense rock gas desorption rate testing device according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a specific embodiment of the dense rock gas desorption rate testing device of the present invention.
Reference numerals:
1, 2, 3-valve 4-core holder 5-pressure gauge 6-rock sample 7-gas storage tank 8-liquid storage tank 9, 10-special liquid 11, 12-film 13-mass metering instrument 14-rubber hose 15-gas pump 16-gas collecting bottle 17-data transmission line 18-computer 19-booster pump
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a schematic structural diagram of a dense rock gas desorption rate testing device according to an embodiment of the invention. As shown in the figure, the dense rock gas desorption rate testing device of the present embodiment includes a gas desorption device 101, a gas volume measuring device 102 and a computer 18, wherein the gas desorption device 101 is connected to the gas volume measuring device 102, and the gas volume measuring device 102 is connected to the computer 18.
Fig. 2 is a schematic structural diagram of a specific embodiment of the dense rock gas desorption rate testing device of the present invention. As shown in the figure, the gas desorption device 101 comprises a core holder 4, a booster pump 19 and a pressure gauge 5, wherein the core holder 4 stores a rock sample 6, the core holder 4 applies formation annular pressure to the rock sample 6 through the booster pump 19, and the pressure gauge 5 is used for testing the annular pressure of the core holder 4; the gas volume measuring device 102 comprises a gas storage tank 7, a rubber hose 14, a mass meter 13, special liquids 9 and 10, a liquid storage tank 8 and films 11 and 12, wherein the gas storage tank 7 stores the special liquid 9, and the liquid storage tank 8 stores the special liquid 10; along with the annular pressure generated by the core holder 4, the gas in the rock sample 6 is desorbed and is discharged to the gas storage tank 7 through the valve 1, and the gas can discharge the special liquid 9 in the gas storage tank 7 to the liquid storage tank 8; the mass meter 13 measures the weight of the discharged special liquid 9, the weight is transmitted to the computer 18 in real time through the data transmission line 17, the weight of the special liquid 9 discharged in real time is recorded, the density of the special liquid 9 is known, and the computer 18 automatically calculates the volume of the special liquid 9 discharged in real time; the computer 18 calculates the desorption rate of the rock sample 6 from the volume of the particular liquid 9 discharged in real time at different time intervals.
In this embodiment, the tight rock gas desorption rate testing device further comprises a gas collecting bottle 16 and an air pump 15, wherein the collecting bottle 16 is connected to the gas storage tank 7 through a valve 3, and the air pump 15 is connected to the liquid storage tank 8 through a valve 2; when all the special liquid 9 in the gas storage tank 7 is discharged into the liquid storage tank 8, the valve 2 and the valve 3 are opened, the gas pump 15 is used for inflating the liquid storage tank 8, the special liquid 10 is discharged into the gas storage tank 7, and the gas in the gas storage tank 7 is discharged into the collecting bottle 16.
In this embodiment, the core sample 6 is shale or coal core.
In the present embodiment, the specific liquid 9, 10 is an antifreeze.
In another embodiment, the gas desorption device 101 and the gas volume measurement device 102 may be plural, and there is a one-to-one correspondence between them, so that the desorption rates of plural rock samples can be measured simultaneously.
The specific implementation steps of utilizing the dense rock gas desorption rate testing device to carry out desorption rate testing are as follows:
first, the gas volume measuring device 102 is initialized: the valve 1 is released and the gas desorption device 101 and the gas volume measuring device 102 are disconnected, so that the gas container 7 is connected to the atmosphere. The valve 3 is closed, the valve 2 is opened, the air pump 15 is used for filling air into the liquid storage tank 8, the special liquid 10 in the liquid storage tank 8 is discharged to the air storage tank 7 through the rubber hose 14, the air storage tank 7 is completely filled with the special liquid 9, and the air in the air storage tank 7 is discharged through the valve 1. The membranes 11, 12 are intended to be gas and liquid tight.
Secondly, placing a sample: the rock sample 6 is placed in the core holder 4, the ring pressure of the core holder 4 is added to the pressure of the formation in which the rock sample 6 is located (measured with the pressure gauge 5) by means of the booster pump 19, and the gas desorption device 101 and the gas volume measuring device 102 are connected together by means of the valve 1.
Thirdly, volume measurement: after the gas in the rock sample 6 is desorbed, the gas is discharged to the gas storage tank 7 through the valve 1, and the gas can discharge the special liquid 9 in the gas storage tank 7 to the liquid storage tank 8. The mass meter 13 measures the weight of the discharged special liquid 9, and the weight of the discharged special liquid 9 is transmitted to the computer 18 through the data transmission line 17 to record, and the computer 18 automatically calculates the volume of the discharged special liquid 9, namely the volume of the gas, because the density of the special liquid 9 is known.
Fourthly, calculating the desorption rate: the computer 18 records the volume of gas desorbed from the rock sample at different time intervals, and the volume of gas acquired during a certain period can be obtained by subtracting the total gas amount acquired during the previous period from the total gas amount acquired during the certain period. Thus, with this method, the volume of desorbed gas at each stage of the rock sample 6 from the start of desorption to the end of desorption can be calculated, and the rate of gas desorption of the rock sample 6 can be obtained.
In this embodiment, if the valve 1 is closed, the valves 2 and 3 are opened, and the air pump 15 is used to charge the liquid storage tank 8 when all the special liquid 9 in the gas storage tank 7 is discharged into the liquid storage tank 8 and the gas content test of the rock sample 6 is not finished, the special liquid 10 will be discharged into the gas storage tank 7, and the gas storage tank 7 will be discharged into the gas collection bottle 16. When the gas storage tank 7 is filled with the special liquid 9 and the gas is completely discharged to the gas collection bottle 16, the valves 2 and 3 are closed, and the valve 1 is opened to continue the test. This is repeated until the gas desorption rate test of the rock sample 6 is finished.
The testing device for testing the gas desorption rate of shale gas/coal bed gas provided by the embodiment of the invention not only can measure the mass of liquid discharged by the gas storage tank by using the mass meter and obtain the volume of the liquid by knowing the density of the liquid so as to realize the measurement of the gas volume, but also can record the volume of gas desorbed from rock samples at different time intervals by using the computer so as to obtain the desorption rate of the rock gas, thereby providing basic data for researching the gas storage capacity of shale and coal beds in a certain area in time.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (4)
1. The dense rock gas desorption rate testing device is characterized by comprising a gas desorption device (101), a gas volume measuring device (102) and a computer (18), wherein the gas desorption device (101) is connected to the gas volume measuring device (102), and the gas volume measuring device (102) is connected to the computer (18); wherein,
the gas desorption device (101) comprises a core holder (4), a booster pump (19) and a pressure gauge (5), wherein a rock sample (6) is stored in the core holder (4), the core holder (4) applies formation annular pressure to the rock sample (6) through the booster pump (19), and the pressure gauge (5) is used for testing the annular pressure of the core holder (4);
the gas volume measuring device (102) comprises a gas storage tank (7), a rubber hose (14), a mass measuring instrument (13), special liquids (9, 10), a liquid storage tank (8) and films (11, 12), wherein the gas storage tank (7) stores the special liquid (9), and the liquid storage tank (8) stores the special liquid (10);
along with the annular pressure generated by the core holder (4), the gas in the rock sample (6) is desorbed and is discharged to the gas storage tank (7) through the valve (1), and the gas can discharge the special liquid (9) in the gas storage tank (7) to the liquid storage tank (8); the mass meter (13) measures the weight of the discharged special liquid (9), the weight is transmitted to the computer (18) in real time through the data transmission line (17) to record the weight of the discharged special liquid (9), the density of the special liquid (9) is known, and the computer (18) automatically calculates the volume of the discharged special liquid (9) in real time;
the computer (18) calculates the desorption rate of the rock sample (6) according to the volume of the special liquid (9) discharged in real time at different time intervals;
the gas desorption rate testing device further comprises a gas collecting bottle (16) and an air pump (15), the collecting bottle (16) is connected to the gas storage tank (7) through a valve (3), and the air pump (15) is connected to the liquid storage tank (8) through a valve (2);
when all special liquid (9) in the gas storage tank (7) are discharged into the liquid storage tank (8), the valve (2) and the valve (3) are opened, the gas pump (15) inflates the liquid storage tank (8), the special liquid (10) is discharged into the gas storage tank (7), and the gas in the gas storage tank (7) is discharged into the collecting bottle (16).
2. The tight rock gas desorption rate testing device of claim 1 wherein the core sample (6) is a shale or a coal core.
3. Dense rock gas desorption rate testing device according to claim 1, characterized in that the specific liquid (9, 10) is an anti-freezing liquid.
4. The tight rock gas desorption rate testing apparatus of any one of claims 1 to 3, wherein the gas desorption apparatus (101) and the gas volume measuring apparatus (102) are plural in one-to-one correspondence so that desorption rates of plural rock samples can be measured simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410010190.5A CN103776713A (en) | 2014-01-09 | 2014-01-09 | Gas desorption rate testing device for dense rock |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410010190.5A CN103776713A (en) | 2014-01-09 | 2014-01-09 | Gas desorption rate testing device for dense rock |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290058A (en) * | 2016-08-25 | 2017-01-04 | 中国石油天然气股份有限公司 | Method and device for measuring gas-containing data of rock |
| CN106525637A (en) * | 2016-12-27 | 2017-03-22 | 重庆矿产资源开发有限公司 | Shale gas-content testing device and testing method |
| CN107014717A (en) * | 2017-03-29 | 2017-08-04 | 铜仁中能天然气有限公司 | The method of testing and its device of gas gas desorption quantity are lost in a kind of shale gas well |
| CN107916926A (en) * | 2016-10-10 | 2018-04-17 | 中国石油化工股份有限公司 | Oil reservoir gas tightness evaluation method |
| CN108254289A (en) * | 2017-12-18 | 2018-07-06 | 中国石油天然气股份有限公司 | Method and device for determining gas content of shale |
| CN108663498A (en) * | 2017-03-27 | 2018-10-16 | 中国石油化工股份有限公司 | The shale gas site desorption experimental provision and method of high temperature decompression and pressure break |
| CN112378812A (en) * | 2020-11-06 | 2021-02-19 | 西南石油大学 | Experimental device and method for determining desorption rate of adsorption type shale gas |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290058A (en) * | 2016-08-25 | 2017-01-04 | 中国石油天然气股份有限公司 | Method and device for measuring gas-containing data of rock |
| CN106290058B (en) * | 2016-08-25 | 2019-05-07 | 中国石油天然气股份有限公司 | Method and device for measuring gas-containing data of rock |
| CN107916926A (en) * | 2016-10-10 | 2018-04-17 | 中国石油化工股份有限公司 | Oil reservoir gas tightness evaluation method |
| CN107916926B (en) * | 2016-10-10 | 2021-02-23 | 中国石油化工股份有限公司 | Oil reservoir gas tightness evaluation method |
| CN106525637A (en) * | 2016-12-27 | 2017-03-22 | 重庆矿产资源开发有限公司 | Shale gas-content testing device and testing method |
| CN108663498A (en) * | 2017-03-27 | 2018-10-16 | 中国石油化工股份有限公司 | The shale gas site desorption experimental provision and method of high temperature decompression and pressure break |
| CN107014717A (en) * | 2017-03-29 | 2017-08-04 | 铜仁中能天然气有限公司 | The method of testing and its device of gas gas desorption quantity are lost in a kind of shale gas well |
| CN107014717B (en) * | 2017-03-29 | 2024-04-12 | 上海瑞达峰致能源科技股份有限公司 | Method and device for testing desorption gas amount of lost gas in shale gas well |
| CN108254289A (en) * | 2017-12-18 | 2018-07-06 | 中国石油天然气股份有限公司 | Method and device for determining gas content of shale |
| CN108254289B (en) * | 2017-12-18 | 2020-07-10 | 中国石油天然气股份有限公司 | Method and device for determining gas content of shale |
| CN112378812A (en) * | 2020-11-06 | 2021-02-19 | 西南石油大学 | Experimental device and method for determining desorption rate of adsorption type shale gas |
| CN112378812B (en) * | 2020-11-06 | 2021-12-14 | 西南石油大学 | Experimental device and method for determining desorption rate of adsorption type shale gas |
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Application publication date: 20140507 |