CN214346293U - Triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrate - Google Patents
Triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrate Download PDFInfo
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- CN214346293U CN214346293U CN202023326188.9U CN202023326188U CN214346293U CN 214346293 U CN214346293 U CN 214346293U CN 202023326188 U CN202023326188 U CN 202023326188U CN 214346293 U CN214346293 U CN 214346293U
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Abstract
The utility model discloses a triaxial pressure chamber device of natural gas hydrate normal position synthesis and decomposition, characterized by mainly has last bearing plate, go up the plunger, the water drive manometer, the water injection switch, the rock specimen is full of water inlet channel, gas pressure, the natural gas injection switch, the natural gas injection pipeline, control by temperature change circulation liquid outflow control switch, the pressure chamber upper cover plate, pressure chamber annular space shell, confined pressure loading chamber, confined pressure loading oil circuit pipeline, hydraulic oil control switch, confined pressure display fluid manometer, the pressure transmission gum cover, the rock core pressure chamber, the pressure chamber lower cover plate, control by temperature change circulation liquid inflow pipeline, control by temperature change circulation liquid inflow control switch, the gas-liquid outflow pipeline, gas-liquid outflow control switch, the gas-liquid flowmeter, lower plunger, lower bearing plate. The utility model is simple in operation, the warm-pressing mechanical environment that can satisfy the synthesis of natural gas hydrate and decompose has the effect of sign rock mechanical properties and measurement weather exploitation output moreover.
Description
Technical Field
The utility model relates to a pressure chamber device especially relates to a triaxial pressure chamber device of natural gas hydrate normal position synthesis and decomposition.
Background
In the scientific research of oil and gas engineering drilling, stratum rock samples are usually taken to simulate stratum conditions to carry out a triaxial compression experiment to know the mechanical properties of stratum rocks. Conventional reservoir rock is drilled and taken to a laboratory at normal temperature and normal pressure, and formation fluid is usually reserved in rock sample pores; the existing triaxial pressure chamber is used for providing confining pressure to simulate the formation stress condition; taking the rock sample to a drying box to raise the temperature of the rock sample to a stratum temperature simulation stratum temperature condition; the formation conditions can be simulated to complete the mechanical property test experiment of the reservoir rock. The formation condition of the weather hydrate requires a specific low-temperature environment and a specific high-pressure gas condition, the hydrate reservoir rock sample taken to a laboratory usually only has rock skeleton rock, the natural gas hydrate in the rock sample pore is completely decomposed, the formation condition needs to be simulated, the natural gas hydrate is artificially synthesized again in the rock sample pore under the specific low-temperature and high-pressure gas condition, and the rock mechanics experiment is carried out by adding the confining pressure stress environment of the natural gas hydrate rock under the simulated formation state under the condition. Therefore, the problem to be solved by the scheme is that a high-pressure water-gas channel, a low-temperature environment and a confining pressure stress environment are provided for the rock sample of the rock core pressure chamber.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a triaxial pressure chamber device of natural gas hydrate normal position synthesis and decomposition for the rock mechanics nature and the hydrate exploitation output of evaluation natural gas hydrate reservoir stratum.
In order to achieve the above object, the utility model adopts the following technical scheme:
a triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrate is characterized by mainly comprising an upper bearing plate, an upper plunger, a water-driven pressure gauge, a water injection switch, a rock sample water-saturated water inlet pipeline, a gas pressure gauge, a natural gas injection switch, a natural gas injection pipeline, a temperature-controlled circulating liquid outflow control switch, a pressure chamber upper cover plate, a pressure chamber annular shell, a confining pressure loading chamber, a confining pressure loading oil pipeline, a hydraulic oil control switch, a confining pressure display oil pressure gauge, a pressure transmission rubber sleeve, a rock core pressure chamber, a pressure chamber lower cover plate, a temperature-controlled circulating liquid inflow pipeline, a temperature-controlled circulating liquid inflow control switch, a gas-liquid outflow pipeline, a gas-liquid outflow control switch, a gas-liquid flow meter, a lower plunger and a lower bearing plate.
Furthermore, the core pressure chamber is sequentially connected with the pressure transmission rubber sleeve, the confining pressure loading chamber, the confining pressure loading pipeline, the pressure chamber annular shell, the temperature control circulating liquid inflow pipeline and the temperature control circulating liquid outflow pipeline in the circumferential direction.
Furthermore, the upper part of the rock core pressure chamber is sequentially connected with an upper plunger, a pressure chamber upper cover plate, an upper bearing plate, a rock sample water-saturated water inlet pipeline and a natural gas injection pipeline.
Furthermore, the lower part of the rock core pressure chamber is connected with a lower plunger, a pressure chamber lower cover plate, a gas-liquid outflow pipeline and a lower bearing plate.
Furthermore, the upper bearing plate is fixedly connected with the upper plunger through threads, and the lower bearing plate is fixedly connected with the lower plunger through threads.
Furthermore, two channels are respectively established in the upper plunger piston and are a natural gas injection pipeline and a rock sample water-saturated water inlet pipeline.
Further, the natural gas injection pipeline is provided with a gas pressure gauge and a natural gas injection switch, and the rock sample water-saturated water inlet pipeline is provided with a water drive pressure gauge and a water injection switch.
Furthermore, a channel, namely a gas-liquid outflow pipeline, is arranged inside the lower plunger; the gas-liquid outflow pipeline is provided with a gas-liquid outflow control switch and a gas-liquid flowmeter.
Furthermore, the pressure chamber upper cover plate and the pressure chamber lower cover plate are fixedly connected with the pressure chamber annular shell through threads.
Furthermore, the upper end and the lower end of the pressure chamber annular shell are respectively in threaded connection and fixation with a temperature control circulating liquid inflow pipeline and a temperature control circulating liquid outflow pipeline.
Furthermore, the temperature control circulating liquid inflow pipeline is provided with a temperature control circulating liquid inflow control switch, and the temperature control circulating liquid outflow pipeline is provided with a temperature control circulating liquid outflow control switch.
Furthermore, a confining pressure loading oil pipeline penetrating through the pressure chamber annular shell is arranged outside the core pressure chamber.
Furthermore, the inlet end of the confining pressure loading oil pipeline is provided with a hydraulic oil control switch and a confining pressure display oil pressure gauge.
Compared with the prior art, the utility model has the advantages that: (1) the shell of the pressure chamber is arranged into a hollow structure, and a temperature control liquid circulation pipeline is added to enable the pressure chamber to obtain the simulated formation low-temperature condition of the artificial synthesis of the natural gas hydrate; (2) high-pressure water vapor inlet and outlet channels are added to the upper pressure plunger and the lower pressure plunger of the rock sample, so that water and gas are fully supplied to the holes of the rock sample to form good channels.
Drawings
Fig. 1 is a schematic structural diagram of a triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrate according to the present invention.
In the figure: 1. the device comprises an upper bearing plate, 2, an upper plunger, 3, a water drive pressure gauge, 4, a water injection switch, 5, a rock sample saturated water inlet pipeline, 6, a gas pressure gauge, 7, a natural gas injection switch, 8, a natural gas injection pipeline, 9, a temperature control circulating liquid outflow pipeline, 10, a temperature control circulating liquid outflow control switch, 11, a pressure chamber upper cover plate, 12, a pressure chamber annular shell, 13, a confining pressure loading chamber, 14, a confining pressure loading oil pipeline, 15, a hydraulic oil control switch, 16, a confining pressure display oil pressure gauge, 17, a pressure transmission rubber sleeve, 18, a core pressure chamber, 19, a pressure chamber lower cover plate, 20, a temperature control circulating liquid inflow pipeline, 21, a temperature control circulating liquid inflow control switch, 22, a gas-liquid outflow pipeline, 23, a gas-liquid outflow control switch, 24, a gas-liquid flow meter, 25, a lower plunger, 26 and a lower bearing plate.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in figure 1, the utility model relates to a triaxial pressure chamber device of natural gas hydrate in situ synthesis and decomposition, the evaluation device mainly by last bearing plate 1, go up plunger 2, water drive manometer 3, water injection switch 4, rock sample water-saturated inlet pipe 5, gas pressure gauge 6, natural gas injection switch 7, natural gas injection pipeline 8, control by temperature change circulation liquid outflow pipeline 9, control by temperature change circulation liquid outflow control switch 10, pressure chamber upper cover plate 11, pressure chamber annular space shell 12, confined pressure loading chamber 13, confined pressure loading oil circuit pipeline 14, hydraulic oil control switch 15, confined pressure display oil manometer 16, pressure transmission gum cover 17, rock core pressure chamber 18, pressure chamber lower cover plate 19, control by temperature change circulation liquid inflow pipeline 20, control by temperature change circulation liquid inflow control switch 21, gas-liquid outflow pipeline 22, gas-liquid outflow control switch 23, gas-liquid flowmeter 24, A lower plunger 25 and a lower bearing plate 26.
The core pressure chamber 18 is circumferentially connected with a pressure transmission rubber sleeve 17, a confining pressure chamber loading chamber 13, a confining pressure loading pipeline 14, a pressure chamber annular shell 12, a temperature control circulating liquid inflow pipeline 20 and a temperature control circulating liquid outflow pipeline 9 in sequence; the upper part of the core pressure chamber 18 is sequentially connected with an upper plunger 2, a pressure chamber upper cover plate 11, an upper bearing plate 1, a water inlet pipeline 5 and a natural gas injection pipeline 8; and a lower plunger 25, a pressure chamber lower cover plate 19, a gas-liquid outflow pipeline 22 and a lower bearing plate 26 are connected below the core pressure chamber 18.
As shown in fig. 1, the utility model relates to a triaxial pressure chamber device of natural gas hydrate normal position synthesis and decomposition, its implementation process is: the upper plunger 2 is first pulled out, a standard rock sample of 25mm diameter x 50mm height is loaded into the core pressure chamber 18, and the upper plunger 2 is loaded back into the upper end of the core pressure chamber 18.
The entire core pressure chamber 18 is placed into the press with the lower bearing plate 26 aligned with the press lower platen, and then the upper bearing plate 1 is loaded into contact with the press ram just to stop the loading. The liquid temperature control circulator is connected with a temperature control circulating liquid outflow pipeline 9 and a temperature control circulating liquid inflow pipeline 20. The rock sample water-saturated water inlet pipeline 5 is connected with an external water source supply tank, the natural gas injection pipeline 8 is connected with an external high-pressure gas source, and the confining pressure loading oil pipeline 14 is connected with an external confining pressure loading oil pump.
Opening a confining pressure loading oil pump hydraulic oil control switch 15, observing confining pressure and displaying a confining pressure display oil pressure gauge 16 to set the confining pressure to a set value, after the confining pressure loading is finished, opening a water injection switch 4 and observing whether a water drive pressure gauge 3 is a displacement pressure set value or not, adjusting the water injection pressure, opening a gas-liquid outflow control switch 23, seeing that the indication value of a gas-liquid flowmeter 24 is stable and water flow at an outlet of a gas-liquid outflow pipeline 22 is not interrupted, indicating that a rock sample is saturated with water, and closing the water injection switch 4. And (3) turning on the natural gas injection switch 7, observing whether the gas pressure gauge 6 is a displacement pressure set value, adjusting gas injection pressure, turning on the gas-liquid outflow control switch 23, observing that the indication value of the gas-liquid flowmeter 24 is stable and gas at the outlet of the gas-liquid outflow pipeline 22 is not cut off, indicating that rock sample pores are saturated, turning off the gas-liquid outflow control switch 23, and then turning off the natural gas injection switch 7. So that high-pressure natural gas and water seal exist in the rock sample.
And then, opening an external temperature control machine to set the temperature, opening a temperature control circulating liquid inflow control switch 21 and a temperature control circulating liquid outflow control switch 10, waiting for observing a gas pressure gauge 6 until the gas pressure indication value is reduced to a certain value and kept stable for a long time, and explaining the rock sample, wherein a stable natural gas hydrate is formed in the water, gas, pressure and temperature environment, namely, the experiment can be carried out according to the triaxial compression experiment process of the rock.
Claims (10)
1. A triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrate is characterized by mainly comprising an upper pressure bearing plate (1), an upper plunger (2), a water-driven pressure gauge (3), a water injection switch (4), a rock sample water-saturated water inlet pipeline (5), a gas pressure gauge (6), a natural gas injection switch (7), a natural gas injection pipeline (8), a temperature-controlled circulating liquid outflow pipeline (9), a temperature-controlled circulating liquid outflow control switch (10), a pressure chamber upper cover plate (11), a pressure chamber annular shell (12), a confining pressure loading chamber (13), a confining pressure loading oil pipeline (14), a hydraulic oil control switch (15), a confining pressure display oil pressure gauge (16), a pressure transmission rubber sleeve (17), a rock core pressure chamber (18), a pressure chamber lower cover plate (19), a temperature-controlled circulating liquid inflow pipeline (20), a temperature-controlled circulating liquid inflow control switch (21), A gas-liquid outflow pipeline (22), a gas-liquid outflow control switch (23), a gas-liquid flowmeter (24), a lower plunger (25) and a lower bearing plate (26);
the core pressure chamber (18) is circumferentially and sequentially connected with a pressure transmission rubber sleeve (17), a confining pressure loading chamber (13), a confining pressure loading oil pipeline (14), a pressure chamber annular shell (12), a temperature control circulating liquid inflow pipeline (20) and a temperature control circulating liquid outflow pipeline (9); the upper part of the core pressure chamber (18) is sequentially connected with the upper plunger (2), the pressure chamber upper cover plate (11), the upper bearing plate (1), the rock sample water saturation inlet pipeline (5) and the natural gas injection pipeline (8), and the lower part of the core pressure chamber (18) is connected with the lower plunger (25), the pressure chamber lower cover plate (19), the gas-liquid outflow pipeline (22) and the lower bearing plate (26).
2. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: the upper bearing plate (1) is fixedly connected with the upper plunger (2) through threads, and the lower bearing plate (26) is fixedly connected with the lower plunger (25) through threads.
3. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: two channels are established inside the upper plunger (2) and are respectively a natural gas injection pipeline (8) and a rock sample water-saturated water inlet pipeline (5); the natural gas injection pipeline (8) is provided with a gas pressure gauge (6) and a natural gas injection switch (7), and the rock sample water-saturated water inlet pipeline (5) is provided with a water drive pressure gauge (3) and a water injection switch (4).
4. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: a channel, namely a gas-liquid outflow pipeline (22), is arranged in the lower plunger (25); the gas-liquid outflow pipeline (22) is provided with a gas-liquid outflow control switch (23) and a gas-liquid flowmeter (24).
5. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: the pressure chamber upper cover plate (11) and the pressure chamber lower cover plate (19) are fixedly connected with the pressure chamber annular shell (12) through threads.
6. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: the upper end and the lower end of the pressure chamber annular shell (12) are respectively in threaded connection and fixation with a temperature control circulating liquid inflow pipeline (20) and a temperature control circulating liquid outflow pipeline (9).
7. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 6, wherein: the temperature control circulating liquid inflow pipeline (20) is provided with a temperature control circulating liquid inflow control switch (21), and the temperature control circulating liquid outflow pipeline (9) is provided with a temperature control circulating liquid outflow control switch (10).
8. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: and a confining pressure loading oil pipeline (14) penetrating through the pressure chamber annular shell (12) is arranged outside the core pressure chamber (18).
9. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: and a hydraulic oil control switch (15) and a confining pressure display oil pressure gauge (16) are arranged at the inlet end of the confining pressure loading oil pipeline (14).
10. The triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrates according to claim 1, wherein: the inner edge of the core pressure chamber (18) is hermetically connected with a pressure transmission rubber sleeve (17) by a steel ring.
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| CN202023326188.9U CN214346293U (en) | 2020-12-31 | 2020-12-31 | Triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrate |
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| CN202023326188.9U CN214346293U (en) | 2020-12-31 | 2020-12-31 | Triaxial pressure chamber device for in-situ synthesis and decomposition of natural gas hydrate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115096716A (en) * | 2022-07-04 | 2022-09-23 | 西南石油大学 | Ground observation experiment device for compressive strength of underground rock formation of oil and gas well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115096716A (en) * | 2022-07-04 | 2022-09-23 | 西南石油大学 | Ground observation experiment device for compressive strength of underground rock formation of oil and gas well |
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