CN211201957U - Shale gas pressurize coring on-site gas content testing arrangement external member - Google Patents
Shale gas pressurize coring on-site gas content testing arrangement external member Download PDFInfo
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- CN211201957U CN211201957U CN201921684502.5U CN201921684502U CN211201957U CN 211201957 U CN211201957 U CN 211201957U CN 201921684502 U CN201921684502 U CN 201921684502U CN 211201957 U CN211201957 U CN 211201957U
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- 238000012360 testing method Methods 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000004458 analytical method Methods 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims description 16
- 239000007789 gas Substances 0.000 description 94
- 238000000034 method Methods 0.000 description 14
- 239000011435 rock Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012067 mathematical method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
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Abstract
The utility model discloses a shale gas pressure maintaining coring site gas content testing device suite, which comprises an early stage gas content testing device and a later stage gas content testing device; the early-stage gas content testing device comprises a pressure-maintaining coring barrel (1), a pipeline connecting joint (3), a gas release pipeline (4) and a water tank (5), wherein a metering barrel (6) is arranged in the water tank (5), one end of the gas release pipeline (4) is connected with the pressure-maintaining coring barrel (1) through the pipeline connecting joint (3), and the other end of the gas release pipeline (4) is positioned in the water tank (5); the later-stage gas content testing device comprises a core analysis tank (8) and analysis metering equipment (10), wherein the core analysis tank (8) is connected with the analysis metering equipment (10) through an exhaust pipeline (11). The test device suite for the gas content of the shale gas pressure maintaining and coring site can be used for testing the gas content of the shale gas pressure maintaining and coring site, and can accurately determine the total gas content of shale.
Description
Technical Field
The utility model relates to a geological exploration equipment field, specific be a shale gas is protected pressure and is got on-spot gassiness volume testing arrangement external member of coring.
Background
Shale gas is an unconventional natural gas existing in shale, and the shale gas in China has abundant resources and good exploration and development prospects. The shale gas is vigorously developed, and the method has important significance for meeting the continuously and rapidly increased energy demand of China and realizing clean and efficient utilization of energy. The shale gas mainly exists in pores and cracks in a free state and an adsorption state, and the determination of the gas content of the shale gas is of great significance for shale gas reservoir evaluation and reserve calculation. The shale gas content parameter is the most basic and key parameter for exploration and development of shale gas reservoir evaluation, geological selection, capacity development and the like, and has important significance for accurately measuring the shale gas content. The method for testing the gas content comprises a direct method and an indirect method (an isothermal adsorption method and a well logging method), and the direct method is the most direct and accurate method for reflecting the gas content of the shale.
The direct method gas content test is that rapid analysis test is carried out on the drilling site of the shale gas well, thus the timeliness and effectiveness of data can be ensured. For shale gas wells, a conventional coring technology is adopted, and a sample is taken to the ground and then is subjected to on-site gas content testing, so that the method is an important evaluation method and means in shale gas geological exploration at present. However, with the conventional coring technology, the gas (methane) is inevitably lost in a large amount during the coring process, and the amount of the part of the gas (lost gas) cannot be tested, so that the part of the gas can be finally recovered and calculated only by a mathematical method. Due to the difference of calculation methods, the determination of the total gas content inevitably generates errors.
SUMMERY OF THE UTILITY MODEL
In order to measure the total gas content of shale rock core accurately, the utility model provides a field gas content testing arrangement external member is cored in shale gas pressurize, this field gas content testing arrangement external member is cored in shale gas pressurize, can be used to the field gas content test of coring in shale gas pressurize, can accurately confirm the total gas content of shale.
The utility model provides a technical scheme that its technical problem adopted is:
a shale gas pressure maintaining coring site gas content testing device suite comprises an early stage gas content testing device and a later stage gas content testing device; the early-stage gas content testing device comprises a pressure-maintaining coring barrel, a pipeline connecting joint, a gas discharging pipeline and a water tank, wherein a metering barrel is arranged in the water tank, the metering barrel is of a cylindrical structure with a closed top end and an open bottom end, one end of the gas discharging pipeline is connected with the pressure-maintaining coring barrel through the pipeline connecting joint, the other end of the gas discharging pipeline is positioned in the water tank, the other end of the gas discharging pipeline corresponds to an opening in the bottom end of the metering barrel, and gas discharged from the other end of the gas discharging pipeline can enter the metering barrel; the later-stage gas content testing device comprises a core analysis tank and analysis metering equipment, wherein the core analysis tank is connected with the analysis metering equipment through an exhaust pipeline.
And one end of the pipeline connecting joint is provided with external threads, and one end of the pipeline connecting joint is in threaded connection with an exhaust outlet of the pressure maintaining coring barrel.
The other end of the pipeline connecting joint is provided with internal threads, and the other end of the pipeline connecting joint is in threaded connection with one end of the gas discharge pipeline.
The pressure maintaining coring barrel and the pipeline connecting joint are both positioned outside the water tank, and the pressure maintaining coring barrel is provided with a coring barrel air release valve.
The top of a metering cylinder is positioned outside the water tank, the bottom of the metering cylinder is positioned in the water tank, and the side wall of the metering cylinder is provided with scales.
The top end of the metering cylinder is externally connected with a metering cylinder air relief valve.
The other end of the air discharge pipeline is positioned in the metering cylinder.
One end of the air discharge line and the other end of the air discharge line are positioned at the same height, the volume of the metering cylinder is 10L, and the volume of the water tank is 15L.
The core analysis jar contains a jar body and cover, and jar body can be dismantled with the cover and be connected, is equipped with in the core analysis jar and holds the cavity.
One end of the exhaust line is connected with the tank cover, and the other end of the exhaust line is connected with the analysis metering device (10).
The utility model has the advantages that:
1. the existing on-site gas content tester cannot be connected with the pressure-maintaining coring inner barrel and cannot be applied to the on-site gas content test of the pressure-maintaining coring. The shale gas pressure-maintaining coring site gas content testing device suite can be directly connected with a pressure-maintaining coring barrel, and gas content testing can be carried out without opening the coring barrel.
2. The existing field gas content tester can not test the gas content under high pressure, and the shale gas pressure-maintaining coring field gas content testing device suite can bear certain pressure and has the pressure-relieving function.
3. The shale gas pressure maintaining and coring site gas content testing device suite can directly measure the total gas content of the shale without calculating the loss gas content.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is the general schematic diagram of the field gas content testing device suite for shale gas pressure maintaining and coring.
Fig. 2 is a schematic view showing the connection of the pressure-retaining coring barrel to the line connection joint.
Fig. 3 is a schematic structural view of a core analysis tank.
1. A pressure maintaining coring barrel; 2. a core barrel vent valve; 3. a pipeline connection joint; 4. a gas bleed line; 5. a water tank; 6. a metering drum; 7. a metering cylinder relief valve; 8. a rock core resolving tank; 9. a full-diameter shale core; 10. analyzing the metering equipment; 11. an exhaust line;
81. a tank body; 82. the can lid.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A shale gas pressure maintaining coring site gas content testing device suite comprises an early stage gas content testing device and a later stage gas content testing device; the early-stage gas content testing device comprises a pressure-maintaining coring barrel 1, a pipeline connecting joint 3, a gas discharging pipeline 4 and a water tank 5, wherein a metering barrel 6 is arranged in the water tank 5, the metering barrel 6 is of a cylindrical structure with a closed top end and an open bottom end, one end of the gas discharging pipeline 4 is connected with the pressure-maintaining coring barrel 1 through the pipeline connecting joint 3, the other end of the gas discharging pipeline 4 is positioned in the water tank 5, the other end of the gas discharging pipeline 4 corresponds to an opening at the bottom end of the metering barrel 6, and gas discharged from the other end of the gas discharging pipeline 4 can enter the metering barrel 6; the later-stage gas content testing device comprises a core analysis tank 8 and analysis metering equipment 10, wherein the core analysis tank 8 is connected with the analysis metering equipment 10 through an exhaust pipeline 11, as shown in fig. 1 to 3.
The pressure-maintaining core barrel 1 is a product sold in the market, the pressure-maintaining core barrel 1 can reduce the loss of gas in the drilling process, and the pressure-maintaining core barrel 1 has the greatest advantage that the gas in the rock core cannot be dissipated in the process of taking the rock core to the ground. The core analysis tank 8 is a conventional commercially available product through an exhaust pipeline 11 and an analysis metering device 10, the core analysis tank 8 is used for containing a full-diameter shale core 9, and the analysis metering device 10 is used for measuring the volume of gas exhausted from the core analysis tank 8.
In this embodiment, the pipeline joint 3 is a tubular structure, one end of the pipeline joint 3 is provided with an external thread, and one end of the pipeline joint 3 is in threaded sealing connection with the exhaust outlet of the pressure maintaining core barrel 1, as shown in fig. 2. The other end of the pipeline connecting joint 3 is provided with internal threads, and the other end of the pipeline connecting joint 3 is in threaded sealing connection with one end of the gas discharge pipeline 4.
In this embodiment, the pressure-maintaining coring barrel 1 and the pipeline connecting joint 3 are both located outside the water tank 5, and the pressure-maintaining coring barrel 1 is provided with a coring barrel vent valve 2. An inner cavity for containing a rock core is arranged in the pressure-maintaining coring barrel 1, and when the coring barrel vent valve 2 is in a closed state, the inner cavity of the pressure-maintaining coring barrel 1 is not communicated with the inside of the pipeline connecting joint 3; when the core barrel vent valve 2 is in an open state, the inner cavity of the pressure maintaining core barrel 1 is communicated with the inside of the pipeline connecting joint 3.
In this embodiment, the measuring cylinder 6 may be entirely or partially located in the water tank 5, and preferably, the measuring cylinder 6 is partially located in the water tank 5, that is, the top end of the measuring cylinder 6 is located outside the water tank 5, the bottom end of the measuring cylinder 6 is located in the water tank 5, and the side wall of the measuring cylinder 6 is provided with scales. And a distance of 3cm-8cm is reserved between the bottom end of the metering cylinder 6 and the bottom of the water tank 5, so that the other end of the gas discharge pipeline 4 can enter the metering cylinder 6 conveniently.
In this embodiment, a holder is connected to the outside of the measuring cylinder 6, the measuring cylinder 6 stands in the water tank 5 by the holder, and a measuring cylinder relief valve 7 is connected to the outside of the top end of the measuring cylinder 6. The measuring cylinder 6 and the bracket can adopt a detachable or non-detachable connection mode, and the measuring cylinder 6 can be taken out from the water tank 5 so as to be respectively stored. When the measuring cylinder is used, liquid is injected into the water tank 5, and the liquid level in the water tank 5 is higher than the height of the air inlet at the bottom end of the measuring cylinder 6.
In this embodiment, the opening at the bottom end of the metering cylinder 6 is the air inlet of the metering cylinder 6, the inner diameter of the air inlet is smaller than the inner diameter of the metering cylinder 6, the other end of the air bleed line 4 passes through the air inlet and is positioned in the metering cylinder 6. for accurate measurement and reduced influence of water pressure, one end of the air bleed line 4 and the other end of the air bleed line 4 are positioned at the same height, preferably, the metering cylinder 6 has a volume of 10L, and the water tank 5 has a volume of 15L.
In this embodiment, the core analysis tank 8 includes a tank body 81 and a tank cover 82, the tank body 81 and the tank cover 82 are detachably connected, and a housing cavity is provided in the core analysis tank 8. One end of the exhaust line 11 is connected to the canister lid 82 and the other end of the exhaust line 11 is connected to the analytical metering device 10, as shown in fig. 1 and 3.
The working process of the shale gas pressure maintaining and coring site gas content testing device suite is described below.
And after the coring drill rod is lifted out of the shaft, taking the pressure maintaining coring barrel 1 out of the shaft, wherein the pressure maintaining coring barrel 1 contains a rock core. One end of the pipeline connecting joint 3 is connected with an exhaust outlet of the pressure maintaining coring barrel 1 through threads, and the other end of the pipeline connecting joint 3 is connected with one end of the air discharging pipeline through threads.
Both the water tank 5 and the measuring cylinder 6 were filled with water. When the vent valve 2 of the core barrel is opened, the gas in the pressure maintaining core barrel 1 enters the metering barrel 6 along the vent line 4. The liquid level in the measuring cylinder 6 begins to decrease along with the entering of the gas, and when the liquid level stops decreasing, the coring cylinder vent valve 2 is closed, and the scale of the liquid level in the measuring cylinder 6 is read. After reading, the gas discharge valve 7 of the metering cylinder is opened, and gas is discharged to carry out an ignition experiment. If the air volume exceeds the measuring range of the measuring cylinder, the steps can be repeated for collecting for multiple times until the pressure in the pressure-maintaining coring cylinder 1 is released completely. The gas content measured in the above manner was recorded as Vf。
And after the pressure in the pressure maintaining coring barrel 1 is released, taking out the rock core in the pressure maintaining coring barrel 1. And selecting a part of the core with the length of about 25cm as a full-diameter shale core 9, cleaning and wiping the full-diameter shale core 9, and putting the full-diameter shale core 9 into a core analysis tank 8. The core analysis tank 8 is sealed. The gas desorbed from the full-diameter shale core 9 enters a flow meter arranged in the desorption metering equipment 10, and the flow rate and the total volume of the exhausted gas can be measured. Continuously resolving naturally until the resolving amount is not more than 5cm per day for three consecutive days3When the measurement is completed, the analysis measurement is ended. The gas content measured in the above manner was recorded as Va。
And finally, adding the gas contents measured by the two parts to obtain the total gas content of the measured shale, wherein the total gas content is expressed by the following formula:
Gt＝Vf/mf+Va/ma
wherein G istIs the total gas content of shale in cm3/g；VfGas content measured for a measuring cylinder in cm3；mfThe weight of the core obtained in the pressure maintaining inner cylinder is g; vaFor resolving metering devicesMeasured gas content in cm3；maThe weight in g is the selected full diameter core weight.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and technical scheme, technical scheme and the technical scheme all can the independent assortment use.
Claims (10)
1. The shale gas pressure maintaining and coring site gas content testing device suite is characterized by comprising an early stage gas content testing device and a later stage gas content testing device;
the early-stage gas content testing device comprises a pressure-maintaining coring barrel (1), a pipeline connecting joint (3), a gas discharging pipeline (4) and a water tank (5), wherein a metering barrel (6) is arranged in the water tank (5), the metering barrel (6) is of a cylindrical structure with a closed top end and an open bottom end, one end of the gas discharging pipeline (4) is connected with the pressure-maintaining coring barrel (1) through the pipeline connecting joint (3), the other end of the gas discharging pipeline (4) is located in the water tank (5), the other end of the gas discharging pipeline (4) corresponds to an opening in the bottom end of the metering barrel (6), and gas discharged from the other end of the gas discharging pipeline (4) can enter the metering barrel (6);
the later-stage gas content testing device comprises a core analysis tank (8) and analysis metering equipment (10), wherein the core analysis tank (8) is connected with the analysis metering equipment (10) through an exhaust pipeline (11).
2. The shale gas pressure maintaining and coring site gas content testing device kit according to claim 1, wherein one end of the pipeline connecting joint (3) is provided with external threads, and one end of the pipeline connecting joint (3) is in threaded connection with an exhaust outlet of the pressure maintaining and coring barrel (1).
3. The shale gas pressure maintaining and coring site gas content testing device kit according to claim 2, wherein the other end of the pipeline connecting joint (3) is provided with internal threads, and the other end of the pipeline connecting joint (3) is in threaded connection with one end of the gas release pipeline (4).
4. The shale gas pressure maintaining coring site gas content testing device suite according to claim 1, wherein the pressure maintaining coring barrel (1) and the pipeline connecting joint (3) are both located outside the water tank (5), and a coring barrel gas release valve (2) is arranged on the pressure maintaining coring barrel (1).
5. The shale gas pressure maintaining and coring site gas content testing device kit according to claim 1, wherein the top end of the metering cylinder (6) is located outside the water tank (5), the bottom end of the metering cylinder (6) is located inside the water tank (5), and scales are arranged on the side wall of the metering cylinder (6).
6. The shale gas pressure maintaining coring site gas content testing device suite according to claim 1, wherein a metering cylinder relief valve (7) is connected to the top end of the metering cylinder (6).
7. The shale gas pressure maintaining coring site gas content testing device kit according to claim 1, wherein the other end of the gas release line (4) is located in the metering cylinder (6).
8. The shale gas pressure maintaining coring site gas content testing device kit according to claim 1, wherein one end of the gas release line (4) and the other end of the gas release line (4) are located at the same height, the volume of the metering cylinder (6) is 10L, and the volume of the water tank (5) is 15L.
9. The shale gas pressure maintaining and coring site gas content testing device kit according to claim 1, wherein the core resolving tank (8) comprises a tank body (81) and a tank cover (82), the tank body (81) and the tank cover (82) are detachably connected, and a containing cavity is arranged in the core resolving tank (8).
10. The shale gas pressure maintaining coring site gas content testing device kit according to claim 1, wherein one end of the exhaust line (11) is connected with the tank cover (82), and the other end of the exhaust line (11) is connected with the analytic metering device (10).
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| CN201921684502.5U CN211201957U (en) | 2019-10-10 | 2019-10-10 | Shale gas pressurize coring on-site gas content testing arrangement external member |
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| CN201921684502.5U CN211201957U (en) | 2019-10-10 | 2019-10-10 | Shale gas pressurize coring on-site gas content testing arrangement external member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577666A (en) * | 2021-01-25 | 2022-06-03 | 中国石油天然气股份有限公司 | Shale gas pressure maintaining, coring, pressure reducing, analyzing and metering device and shale gas content measuring method |
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2019
- 2019-10-10 CN CN201921684502.5U patent/CN211201957U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577666A (en) * | 2021-01-25 | 2022-06-03 | 中国石油天然气股份有限公司 | Shale gas pressure maintaining, coring, pressure reducing, analyzing and metering device and shale gas content measuring method |
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