CN207623174U - The experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit - Google Patents
The experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit Download PDFInfo
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- CN207623174U CN207623174U CN201721615625.4U CN201721615625U CN207623174U CN 207623174 U CN207623174 U CN 207623174U CN 201721615625 U CN201721615625 U CN 201721615625U CN 207623174 U CN207623174 U CN 207623174U
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Abstract
The utility model discloses the experimental provision that hemihydrate content in a kind of accurate measure small size deposit changes, small volume reaction kettle is connected with standard gas chamber, and shut-off valve is arranged between the two；Differential pressure pick-up both ends are connected with small volume reaction kettle and standard gas chamber respectively, and the gas pressure difference between small volume reaction kettle and standard gas chamber is measured by differential pressure pickup；Small volume reaction kettle, standard gas chamber and differential pressure pick-up are placed in temperature control modules, and it is identical and constant to control three's temperature by temperature control modules.Gas pressure change amount, gas pressure minor change caused by differential pressure pick-up is more easily measured lanthanum chloride hydrate in small size deposit or decomposes are measured using differential pressure pick-up.It is easily obtained synthesis and hydrate molar content high-resolution experimental data in decomposable process.Temperature control modules efficiently avoid influence of the temperature change to gas pressure, and then ensure that hemihydrate content variation measuring and calculating accuracy.
Description
Technical field
The utility model belongs to untraditional reservoir engineering and geotechnical engineering Basic Physical Properties technical field of measurement and test, and in particular to
The experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit.
Background technology
Gas hydrates are a kind of cage modle crystallizations formed under the conditions of specific temperature and pressure by natural gas and water
Compound, in the frozen soil stratum such as deep water stratum and polar region plateau such as widely distributed Yu Haiyang lake, reserves are very huge, are considered
It is 21 century mostly important one of potential energy source, receives the great attention of domestic and international government and research institution.
Voltage drop method is the prefered method that gas hydrates runin is adopted, but due to the permeability of hydrate reservoir usually compared with
The gas producing efficiency of difference, this method still cannot meet the needs of being commercialized exploitation at this stage, need to carry out more in-depth study
To improve the gas producing efficiency of exploitation of gas hydrates.Containing hydrate sediment usually by soil particle, gas hydrates, natural
Gas and water composition, four constituent contents have apparent influence for containing hydrate sediment Basic Physical Properties parameter, especially naturally
Gas hydrate saturation degree is always the influence factor that the research work of Basic Physical Properties containing hydrate sediment is paid close attention to.Natural gas
Hydrate concentration is generally defined as the ratio that gas hydrates occupy deposit interstitial space.With gas hydrates
The increase of saturation degree is compressed for the space of fluid migration in hole containing hydrate sediment, and permeability weakens therewith；Contain
There is apparent between the mechanics parameters such as hydrate sediment peak strength and deformation modulus and gas hydrates saturation degree
Positive correlation.In addition, the gas hydrates of different occurrence forms are to containing hydrate sediment Basic Physical Properties in deposit hole
The affecting laws of parameter have differences.Therefore, natural gas in deposit hole is directly observed using computed tomography
The mechanism of hydrate has great importance for containing the explanation of hydrate sediment Basic Physical Properties Evolution.
Currently, the volume of the computed tomography experiment used sample for observing deposit pore scale behavior is usual
For several cubic centimetres, gas pressure reduction and gas hydrate dissociation caused by gas hydrates synthesis is caused to cause
Gas pressure increase equal unobvious, the pressure change measured using pressure sensor is usually close with sensor accuracy class,
Measurement error is big, it is difficult to is depressured in decomposable process in gas hydrates and accurately control hydrate saturation according to gas pressure change
Degree.Therefore, there is an urgent need to develop new technical methods to carry out the hemihydrate content in accurate measure deposit, and it is heavy containing hydrate to grasp
The Evolution of product object Basic Physical Properties.
Utility model content
For problems of the prior art, the purpose of this utility model is to provide a kind of accurate measure corpusculum depositions
The experimental provision and method that hemihydrate content changes in product object, convenient for synthesizing in gas hydrates and being depressured root in decomposable process
According to gas pressure change accurate measure hydrate concentration, provided reliably to contain hydrate sediment pore scale measuring behavior
Hydrate concentration data.
The technical solution that the utility model is taken is：
The experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit, including small volume reaction kettle,
Standard gas chamber, differential pressure pick-up and temperature control modules, small volume reaction kettle are connected with standard gas chamber, between the two setting cut-off
Valve；Differential pressure pick-up both ends are connected with small volume reaction kettle and standard gas chamber respectively, and small volume is measured by differential pressure pickup
Gas pressure difference between reaction kettle and standard gas chamber；Small volume reaction kettle, standard gas chamber and differential pressure pick-up are placed in
In temperature control modules, it is identical and constant to control three's temperature by temperature control modules.
Further, the dischargeable capacity of the small volume reaction kettle is not more than 10ml.
The experimental method that hemihydrate content changes in a kind of accurate measure small size deposit, specifically comprises the following steps：
(1) opening temperature control module controls and keeps the temperature of small volume reaction kettle, standard gas chamber and differential pressure pick-up
It is identical and constant；
(2) gas pressure that shut-off valve is connected to both small volume reaction kettle and standard gas chamber balance is opened；
(3) it closes shut-off valve and small volume reaction kettle and standard gas chamber is isolated, small volume reactor pressure is closed with hydrate
At and reduce, or increased with decomposition of hydrate；Standard air chamber pressure does not change；
(4) pressure difference between small volume reaction kettle and standard gas chamber is measured by using differential pressure pick-up；
(5) variation of hemihydrate content in small volume reaction kettle is calculated according to the equation of gas state.
Further, in the step (1) temperature control modules controlled at -20 DEG C -20 DEG C.
Further, in the step (1) temperature control modules controlled at arbitrary temp within the scope of 0 DEG C -10 DEG C.
Further, in the step (2) gas pressure range between 2MPa-20MPa.
Further, the resolution ratio of differential pressure pick-up is not more than 1kPa in the step (4).
Further, the variation of hydrate molar content in small volume reaction kettle is calculated in the step (5) according to the following formula.
I.e.：
The equation of gas state is
Wherein Δ nhIt is the variation of hydrate molar content, Δ P is to measure pressure difference, and V is that small size reaction gas reactor occupies
Volume, R are ideal gas constants, and T is small size reaction kettle steady temperature.
Further, hydrate molal quantity variable quantity is solved in the step (5) can be hydrated later according to different type
Object molal weight solves quality, that is, is suitable for any gas hydrate content and calculates.
Since the molecular formula of different hydrates is different, there are many used hydrate molecular formula, such as：Hydrate
Molecular formula is CH4·NhH2O or CO2·NhH2O。
The beneficial effects of the utility model are：
Use resolution ratio no more than 1kPa differential pressure pick-up measure gas pressure relative variation be to substitute resolution ratio
The pressure sensor of 0.1MPa measures gas pressure absolute magnitude, it is easier in accurately detecting small size deposit lanthanum chloride hydrate or
Gas pressure minor change (1kPa-100kPa) caused by decomposing.
The more conventional method of hydrate molar content resolution ratio calculated using the utility model promotes 100 times, is easily obtained
Synthesis and hydrate molar content high-resolution experimental data in decomposable process.
Temperature control modules keep small volume reaction kettle, standard gas chamber identical and constant with the temperature of differential pressure pick-up, effectively
Ground avoids influence of the temperature change to gas pressure, and then ensure that hemihydrate content variation measuring and calculating accuracy.
By adding differential pressure pickup and standard gas chamber in the application, using the measurement method disconnected afterwards is first connected, pass through
Standard gas chamber provides an a reference value, is measuring the pressure difference relative quantity after changing, and so as to accurately measure pressure difference, fully solves
The sample of experiment of having determined small size used leads to gas pressure reduction caused by gas hydrates synthesis and natural gas hydration
Gas pressure increases equal unobvious, the big technical problem of measurement error caused by object decomposes.It, which has been broken away from, measures in reaction kettle
The constraint of absolute pressure value, while also having broken differential pressure pickup applied to the measurement limitation in continuity system, at home
Application in outer small sample experiment reaction system belongs to pioneering, and great breakthrough is obtained in terms of hemihydrate content measurement.
Description of the drawings
Fig. 1 is that hemihydrate content changes experimental provision schematic diagram in accurate measure small size deposit.
Fig. 2 is that hemihydrate content changes experimental method flow chart in accurate measure small size deposit.
Wherein, 1, small volume reaction kettle；2, standard gas chamber；3, temperature control modules；4, differential pressure pick-up；5, shut-off valve.
Specific implementation mode
The utility model is further illustrated below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Figure 1, selecting for small volume reaction kettle of the dischargeable capacity no more than 10ml, a kind of accurate measure small size
The experimental provision that hemihydrate content changes in deposit, it is by small volume reaction kettle, standard gas chamber, resolution ratio no more than 1kPa's
Differential pressure pick-up and temperature control modules composition.Small volume reaction kettle is connected with standard gas chamber, arranges shut-off valve between the two；Difference
Pressure sensor both ends are connected with small volume reaction kettle and standard gas chamber, for measuring gas pressure difference between the two；It is small
Volume reaction kettle, standard gas chamber and differential pressure pick-up are placed in temperature control modules, identical and permanent to control three's temperature
It is fixed.
Embodiment 2
Based on above-mentioned experimental provision, as shown in Fig. 2, in a kind of accurate measure small size deposit provided by the utility model
The experimental method of hemihydrate content variation specifically includes following steps：
(1) opening temperature control module is to keep small volume reaction kettle identical and constant as the temperature of standard gas chamber；
(2) it opens shut-off valve and is connected to small volume reaction kettle with standard gas chamber to balance the gas pressure of the two；
(3) shut-off valve is closed so that small volume reaction kettle and standard gas chamber is isolated, and small volume reactor pressure can be because of hydration
Object is synthesized and is reduced, and is increased because of decomposition of hydrate, and standard air chamber pressure will not change；
(4) pressure difference between small volume reaction kettle and standard gas chamber is measured using differential pressure pick-up；
(5) variation of hemihydrate content in small volume reaction kettle is calculated according to the equation of gas state.
Gas hydrates synthetic quantity is calculated
Packing volume is 1.57ml (φ 10 in the small size reaction kettle 1 that dischargeable capacity is 7.85ml (10 × 100mm of φ)
× 20mm) saturated sand, control its porosity be 39.9%；Opening temperature control module 3 with keep small volume reaction kettle 1 with
The temperature of standard gas chamber 2 is identical and constant at 2 DEG C；Into small size reaction kettle 1, gas injection is forced into 6MPa；Shut-off valve 5 is opened to connect
The gas pressure for leading to small volume reaction kettle 1 with standard gas chamber 2 that dischargeable capacity is 2.36ml (10 × 30mm of φ) both to balance,
Pressure finally stabilizes to 6MPa both after tonifying Qi；Shut-off valve 5 is closed so that small volume reaction kettle 1 and standard gas chamber 2, small volume is isolated
1 pressure of reaction kettle is reduced because of lanthanum chloride hydrate, and 2 pressure of standard gas chamber will not change；It is surveyed using differential pressure pick-up 4
Measure the pressure differential deltap P between small volume reaction kettle 1 and standard gas chamber 2；Lanthanum chloride hydrate in small volume reaction kettle 1 is calculated according to the following formula
Variable quantity
Gas hydrate dissociation, which measures, to be calculated
Opening temperature control module 3 is to keep small volume reaction kettle 1 identical as the temperature of standard gas chamber 2 and constant at 2 DEG C；
It opens shut-off valve 5 and is connected to small volume reaction kettle 1 with standard gas chamber 2 to balance the gas pressure of the two；Shut-off valve 5 is closed to be isolated
Small volume reaction kettle 1 and standard gas chamber 2, according to gas in differential pressure pick-up measured value slow release some small volume reaction kettles 1
After close valve, pressure is increased because of decomposition of hydrate in small volume reaction kettle 1, and 2 pressure of standard gas chamber is constant always；It adopts
Changing value Δ P of the pressure difference between small volume reaction kettle 1 and standard gas chamber 2 after closing valve is measured with differential pressure pick-up 4；Root
Decomposition of hydrate amount in small volume reaction kettle 1 is calculated according to following formula
The above is not limitations of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise of not departing from the utility model in essence range, several variations, modifications, additions or substitutions can also be made,
These improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (6)
1. the experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit, which is characterized in that including little Rong
Product reaction kettle, standard gas chamber, differential pressure pick-up and temperature control modules, small volume reaction kettle are connected with standard gas chamber, the two it
Between shut-off valve is set；Differential pressure pick-up both ends are connected with small volume reaction kettle and standard gas chamber respectively, pass through differential pressure pickup
Measure the gas pressure difference between small volume reaction kettle and standard gas chamber；Small volume reaction kettle, standard gas chamber and differential pressure sensing
Device is placed in temperature control modules, and it is identical and constant to control three's temperature by temperature control modules.
2. the experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit according to claim 1,
It is characterized in that, the dischargeable capacity of the small volume reaction kettle is not more than 10ml.
3. the experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit according to claim 1,
Be characterized in that, temperature control modules control and keep the temperature of small volume reaction kettle, standard gas chamber and differential pressure pick-up be-
20℃-20℃。
4. the experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit according to claim 1,
It is characterized in that, it is 0 that the temperature control modules, which control and keep the temperature of small volume reaction kettle, standard gas chamber and differential pressure pick-up,
Arbitrary temp within the scope of DEG C -10 DEG C.
5. the experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit according to claim 1,
It is characterized in that, the gas pressure range of the small volume reaction kettle and standard gas chamber between the two is between 2MPa-20MPa.
6. the experimental provision that hemihydrate content changes in a kind of accurate measure small size deposit according to claim 1,
It is characterized in that, the resolution ratio of the differential pressure pick-up is not more than 1kPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741380A (en) * | 2017-11-28 | 2018-02-27 | 青岛海洋地质研究所 | The experimental provision and method of hydrate changes of contents in a kind of accurate measure small size deposit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741380A (en) * | 2017-11-28 | 2018-02-27 | 青岛海洋地质研究所 | The experimental provision and method of hydrate changes of contents in a kind of accurate measure small size deposit |
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