CN111380790A - System and method for measuring porosity of combustible ice under constant pressure condition - Google Patents
System and method for measuring porosity of combustible ice under constant pressure condition Download PDFInfo
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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Abstract
The embodiment of the application provides a system and a method for measuring the porosity of combustible ice under the condition of constant pressure, wherein the system comprises: the clamping device is used for hermetically clamping the combustible ice sample; the circulating temperature control device is used for maintaining the combustible ice sample at a specified temperature; a constant pressure control device for maintaining the combustible ice sample at a specified pressure; the nuclear magnetic resonance equipment is used for acquiring a T2 spectrum of the combustible ice sample at a specified temperature and pressure; and the data processing device is used for acquiring the porosity of the combustible ice sample according to the T2 spectrum of the combustible ice sample at the specified temperature and pressure. The embodiment of the application can improve the accuracy of measuring the porosity of the combustible ice under the condition of constant pressure.
Description
Technical Field
The application relates to the technical field of combustible ice sample development, in particular to a system and a method for measuring the porosity of combustible ice under a constant pressure condition.
Background
Combustible ice is increasingly receiving attention as one of the important strategic energy sources of countries in the world. Generally, reservoirs enriched with combustible ice are present in the ocean or polar regions. The importance of energy as a core resource and economic life line for world competition is self-evident. How to advance the process of solving the technical problem of combustible ice exploitation is the challenge of energy source life pulse in China and even countries in the world at present. Therefore, the research on combustible ice is an extremely important breakthrough in the world energy field.
During the exploitation process of the combustible ice, the combustible ice can be decomposed due to the change of a temperature field, so that part of stratum skeletons are lost, and the pore volume through which fluid can flow is increased. Thus, controlling the pressure of the combustible ice sediment-containing sample more realistically mimics the formation conditions. The extraction of combustible ice may result in the loss of the skeleton and also increase the flow path of the fluid. More accurate study of pore size under controlled pressure can provide more useful guidance for safe production in the field. Different pressures can result in different porosities and pore sizes at any different stages of production.
The combustible ice sample is simulated or tested in a laboratory, and great guiding significance can be brought to on-site exploration, development and exploitation. The methods for studying the pore size of combustible ice-containing deposits are very numerous today, but most have fatal drawbacks. The pore space of the combustible ice is researched by a nitrogen adsorption method, a mercury pressing method and the like. However, nitrogen adsorption does not give good information about pores above 50 nm. Unfortunately, combustible ice typically has relatively large pores therein, which is a fatal blow to nitrogen adsorption. The mercury intrusion method is to intrude mercury into pores of combustible ice and draw a curve of mercury intrusion and mercury intrusion to obtain pore information. Normally, the combustible ice in reality is a relatively loose structure, and the characteristic completely results in that the mercury pressing method cannot be applied to the combustible ice. And after the compacted combustible ice sample is measured by a mercury porosimetry method, the combustible ice sample is polluted and cannot be used again. Compared with a common rock sample, the manufacturing cost of the combustible ice sample is very high. If only mercury injection test is carried out, the use efficiency of the combustible ice sample is not fully exerted. The above methods applied to the pores of the deposit have a great defect for combustible ice, and when the temperature of the deposit containing the combustible ice changes and the combustible ice is decomposed in a phase change manner, the pore size information under the condition of controlling the pressure cannot be effectively obtained. Therefore, how to accurately measure the porosity of the combustible ice at low cost is a technical problem to be solved urgently.
Disclosure of Invention
An object of the embodiments of the present application is to provide a system and a method for measuring porosity of combustible ice under a constant pressure condition, so as to improve accuracy of measuring porosity of combustible ice under the constant pressure condition.
In order to achieve the above object, in one aspect, the embodiments of the present application provide a system for measuring porosity of combustible ice under constant pressure, including:
the clamping device is used for hermetically clamping the combustible ice sample;
the circulating temperature control device is used for maintaining the combustible ice sample at a specified temperature;
a constant pressure control device for maintaining the combustible ice sample at a specified pressure;
the nuclear magnetic resonance equipment is used for acquiring a T2 spectrum of the combustible ice sample at a specified temperature and pressure;
and the data processing device is used for acquiring the porosity of the combustible ice sample according to the T2 spectrum of the combustible ice sample at the specified temperature and pressure.
The system of measuring combustible ice porosity under the constant voltage condition of this application embodiment, nuclear magnetic resonance equipment's receiving and dispatching antenna places in including the radio frequency coil in the clamping device.
The system of measuring combustible ice porosity under the constant voltage condition of the embodiment of this application, clamping device includes:
a cylindrical housing;
a hollow tube disposed within the cylindrical housing; a flow space is formed between the hollow pipe and the cylindrical shell; the radio frequency coil is sleeved on the hollow pipe;
the cavity tube is arranged in the hollow tube; a flowing space is formed between the cavity tube and the hollow tube;
the plug assemblies are arranged at two ends of the cavity pipe; the plug assembly and the cavity pipe are matched to form a closed cavity for clamping a combustible ice sample.
The system of measuring combustible ice porosity under the constant voltage condition of this application embodiment, the end cap subassembly includes:
inner plugs arranged at two ends of the cavity pipe;
the inner pressing sleeve is sleeved on each inner plug; flaring ports are arranged at two ends of the cavity tube, and the inner end of the inner pressing sleeve is inserted into the corresponding flaring ports in a matching manner;
the outer pressing sleeve is sleeved on each inner plug; the inner end of each outer pressing sleeve inwards presses the outer end of the corresponding inner pressing sleeve;
a fixed pressing sleeve sleeved on each outer pressing sleeve; the outer wall of the fixed pressing sleeve is in threaded connection with the inner wall of the cylindrical shell; the inner end of each fixed pressing sleeve inwards presses the corresponding outer pressing sleeve;
an outer plug arranged in each outer press sleeve; the outer end of the outer plug extends out of the outer pressing sleeve.
According to the system for measuring the porosity of the combustible ice under the constant pressure condition, each inner plug is internally provided with a first central hole, and two ends of each inner plug are provided with interface grooves matched with the first central holes; and a second central hole for accommodating a fluid pipeline is formed in the outer plug, the size of the second central hole is larger than that of the first central hole, and the fluid pipeline is connected with the corresponding first central hole through a connector groove so as to form a flow guide channel.
The system of measuring combustible ice porosity under the constant voltage condition of this application embodiment, circulation temperature regulating device includes:
a liquid bath tank containing heat-conducting liquid therein;
the circulating pipeline comprises a flow guide pipe, a circulating pump and a constant-speed constant-pressure pump, wherein the flow guide pipe is filled with heat-conducting fluid inside; the flow guide pipe is communicated with the flow space, and one part of the flow guide pipe is arranged in the heat-conducting liquid;
and the temperature control system is used for heating or cooling the heat conducting liquid so as to maintain the combustible ice sample at a specified temperature in a heat transfer mode.
The system of measuring combustible ice porosity under the constant voltage condition of this application embodiment, liquid bath surface reaches be equipped with the heat preservation on the surface of honeycomb duct.
The system of measuring combustible ice porosity under the constant voltage condition of this application embodiment, the honeycomb duct set up in part in the heat-conducting liquid is the heliciform and distributes.
The system of measuring combustible ice porosity under the constant voltage condition of the embodiment of this application, constant voltage control device includes:
a fluid reservoir filled with a fluid; the fluid reservoir is communicated with the first central hole through a fluid pipeline;
and the constant-speed constant-pressure pump is arranged on the fluid pipeline and is used for performing constant-pressure control on the combustible ice sample in the clamping device by utilizing the fluid.
In another aspect, an embodiment of the present application further provides a method for measuring porosity of combustible ice under a constant pressure condition by using the porosity system of combustible ice, where the method includes:
placing the combustible ice sample in a holding device;
maintaining the combustible ice sample at a specified temperature based on a circulating temperature control device and at a specified pressure based on a constant pressure control device;
acquiring a T2 spectrum of the combustible ice sample at a specified temperature and pressure by using nuclear magnetic resonance equipment;
and acquiring the porosity of the combustible ice sample by utilizing a data processing device and a T2 spectrum of the combustible ice sample at a specified temperature and pressure.
According to the technical scheme provided by the embodiment of the application, the temperature of the combustible ice sample can be changed by adjusting the circulating temperature control device, and the pressure of the combustible ice sample can be changed by adjusting the constant-pressure control device. Once the temperature of the combustible ice sample is changed, the combustible ice sample undergoes a phase change. During the phase transition of the combustible ice sample, the nuclear magnetic resonance signal (T2 spectrum) of the combustible ice-containing sample can be measured by a nuclear magnetic resonance device. Therefore, a nuclear magnetic resonance signal (T2 spectrum) of the combustible ice sample under the set temperature and pressure can be obtained, the pore size distribution of the combustible ice sample can be characterized on the basis of the T2 spectrum, and the porosity of the combustible ice sample can be calculated on the basis of the pore size distribution. Therefore, the porosity of the combustible ice sample under different temperatures and pressures can be obtained by changing the temperature and the pressure of the combustible ice sample. Therefore, the embodiment of the application fully considers the influence of temperature and pressure, so that the accuracy of measuring the porosity of the combustible ice is improved under the condition of constant pressure. In addition, because this application embodiment is based on nuclear magnetic resonance measures combustible ice porosity, its measurement need not fracture combustible ice for combustible ice after measuring porosity still can be used for other experiments, thereby has practiced thrift combustible ice sample.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort. In the drawings:
FIG. 1 is a block diagram of a system for measuring porosity of combustible ice under constant pressure conditions according to an embodiment of the present application;
FIG. 2 is a cross-sectional view of a clamping device according to an embodiment of the present application;
fig. 3 is a schematic perspective view of a hollow tube according to an embodiment of the present application;
FIG. 4 is a schematic perspective view of an RF coil according to an embodiment of the present application;
FIG. 5 is a schematic representation of the T2 spectrum distribution of a combustible ice sample in an embodiment of the present application;
FIG. 6 is a schematic diagram of the pore size distribution porosity of a combustible ice sample at different temperatures according to an embodiment of the present application;
FIG. 7 is a flow chart of a method for measuring the porosity of combustible ice under constant pressure in an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application. For example, in the following description, forming the second component over the first component may include embodiments in which the first and second components are formed in direct contact, embodiments in which the first and second components are formed in non-direct contact (i.e., additional components may be included between the first and second components), and so on.
Also, for ease of description, some embodiments of the present application may use spatially relative terms such as "above …," "below …," "top," "below," etc., to describe the relationship of one element or component to another (or other) element or component as illustrated in the various figures of the embodiments. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or components described as "below" or "beneath" other elements or components would then be oriented "above" or "over" the other elements or components.
The combustible ice is a substance formed by combining alkanes or hydrocarbons with water at a certain temperature and pressure, and is rich in hydrogen atoms, and the hydrogen nuclei are important conditions for nuclear magnetic resonance observation. It is therefore possible to consider measuring the porosity of combustible ice by nuclear magnetic resonance.
Referring to fig. 1, a system for measuring the porosity of combustible ice under constant pressure according to an embodiment of the present invention may include a holding device, a circulation temperature control device, a constant pressure control device, a nuclear magnetic resonance device (not shown), and a data processing device (not shown). The clamping device can be used for hermetically clamping a combustible ice sample; a circulating temperature control device can be used to maintain the combustible ice sample at a specified temperature; a constant pressure control device may be used to maintain the combustible ice sample at a specified pressure; a nuclear magnetic resonance device can be used for obtaining a T2 spectrum of the combustible ice sample at a specified temperature and pressure; the data processing device can be used for acquiring the porosity of the combustible ice sample according to the T2 spectrum of the combustible ice sample at a specified temperature and pressure.
In one embodiment of the present application, the temperature of the combustible ice sample can be changed by adjusting the circulating temperature control device. Once the temperature of the combustible ice sample is changed, the combustible ice sample undergoes a phase change. During the phase transition of the combustible ice sample, the nuclear magnetic resonance signal (T2 spectrum) of the combustible ice-containing sample can be measured by a nuclear magnetic resonance device. Thus, a nuclear magnetic resonance signal (T2 spectrum) of the combustible ice sample at a set temperature can be obtained, for example, as shown in fig. 5, and the pore size distribution of the combustible ice sample can be characterized based on the T2 spectrum, and the porosity of the combustible ice sample can be calculated based on the pore size distribution. Thus, by changing the temperature and pressure of the combustible ice sample, the pore size distribution of the combustible ice sample at different temperatures and pressures can be obtained, for example, as shown in fig. 6, and the porosity of the combustible ice sample can be obtained based on the pore size distribution of the combustible ice sample. The system for measuring the porosity of combustible ice under the constant pressure condition of the embodiment of the application can be applied to various experimental environments, for example, can be used under the conditions of low temperature and high pressure.
In addition, in an embodiment of the application, the problems of compaction of the flammable ice sample, pore size requirements and the like do not exist through the nuclear magnetic resonance technology. And after the measurement is finished, the sample has no damage. The combustible ice sample after nuclear magnetic resonance measurement can be subjected to other destructive experiments, so that the utilization rate of the sample is greatly improved. Moreover, the combustible ice sample retained its intact characteristics until other experiments were performed. The method not only reduces the cost, but also provides guarantee for the accuracy of other experiments.
In an embodiment of the present application, the transceiver antenna of the nmr apparatus may include a radio frequency coil embedded in the holding device. The design of the integration of the radio frequency coil and the clamping device can enable the nuclear magnetic resonance equipment to obtain data with smaller noise, thereby being beneficial to analyzing the rule of the combustible ice sample during decomposition.
Referring to fig. 2, in an embodiment of the present application, the clamping device may include a cylindrical housing 16, a hollow tube 17 (for example, as shown in fig. 3) disposed in the cylindrical housing 16, a cavity tube 18 disposed in the hollow tube 17, and plug assemblies disposed at two ends of the cavity tube 18. A flow space 10 can be formed between the hollow tube 17 and the cylindrical shell 16; and the rf coil 30 can be sleeved on the hollow tube 17. Therefore, the hollow tube 17 and the radio frequency coil 30 are combined into a whole, so that the radio frequency coil is not required to be added outside the clamping device for measurement. And, after integration, the rf coil 30 only measures the nmr signal of the intermediate chamber and the combustible ice sample 20, which greatly reduces the noise generated by the remaining components. A flow space 10 can also be formed between the cavity tube 18 and the hollow-out tube 17. The plug assembly and the cavity tube 18 cooperate to enclose a closed chamber for holding a combustible ice sample. It should be noted that all the components (except the rf coil) of the clamping device of the embodiment of the present application do not generate the nmr signal in the magnetic field, so as not to interfere with the nmr signal of the combustible ice sample.
With continued reference to fig. 2, in an embodiment of the present application, the plug assembly may include inner plugs 14 disposed at both ends of the cavity tube 18, inner compression sleeves 15 sleeved on each inner plug 14, outer compression sleeves 13 sleeved on each inner plug 14, fixed compression sleeves 12 sleeved on each outer compression sleeve 13, and outer plugs 11 disposed in each outer compression sleeve. The two ends of the cavity tube 18 are provided with flaring holes, and the inner end of the inner pressing sleeve 15 can be inserted into the corresponding flaring holes in a matching way; the inner end of each outer pressing sleeve 13 can press the outer end of the corresponding inner pressing sleeve 15 inwards; the outer wall of the fixed pressing sleeve 12 can be in threaded connection with the inner wall of the cylindrical shell 16; the inner end of each fixed pressing sleeve 12 can press the corresponding outer pressing sleeve 13 inwards; the outer end of the outer plug 11 can extend out of the outer pressing sleeve 13.
With continued reference to fig. 2, in an embodiment of the present application, a first central hole 141 is formed in each inner plug 14, and interface slots 142 matching with the first central hole 141 are formed at two ends of each inner plug 14; a second central hole 111 for accommodating a fluid pipeline is formed in the outer plug 11, and the size of the second central hole 11 can be larger than that of the first central hole 141, so that the pressure can be increased; the fluid lines may be used to connect with the corresponding first central bore 141 through the interface slot 142, thereby forming a flow directing passage. The interface of the fluid pipeline is arranged in the outer plug 11, so that the safety under the high-pressure experiment condition can be improved.
Referring to fig. 1 and 2, in an embodiment of the present application, the circulation temperature control device may include a liquid bath, a circulation pipeline, and a temperature control system. Wherein, the liquid bath can contain heat-conducting liquid (such as ethylene glycol or aqueous solution thereof). The circulating pipeline can comprise a flow guide pipe filled with heat-conducting fluid (such as ethylene glycol or aqueous solution thereof) inside, and a circulating pump and a constant-speed constant-pressure pump which are arranged on the flow guide pipe; the flow guide tube may communicate with the flow space 10 to perform heat transfer on the combustible ice sample; and a part of the flow guide pipe is arranged in the heat-conducting liquid so as to be convenient for heat exchange with the heat-conducting liquid in the liquid bath tank. The temperature control system can be used for heating or cooling the heat conducting liquid so as to maintain the combustible ice sample at a specified temperature through a heat transfer mode.
In an embodiment of the present application, the circulation pump and the constant-speed constant-pressure pump may be disposed at the outflow end of the heat transfer fluid, so as to prevent the additional energy generated by the operation of the pump from causing the temperature of the heat transfer fluid in the circulation pipeline to change. The circulating pump can enable the heat-conducting fluid to continuously flow in the circulating pipeline; the constant-speed constant-pressure pump can keep the heat-conducting fluid at a constant flow rate when the heat-conducting fluid enters the liquid bath and the clamping device so as to reduce temperature fluctuation.
In an embodiment of the application, in order to achieve a better temperature control effect, heat preservation layers are arranged on the outer surface of the liquid bath and the outer surface of the flow guide pipe. The insulating layer can be a thermal insulating material (such as aerogel, glass fiber and the like) with a certain thickness so as to reduce the energy exchange between the liquid bath and the outside air, thereby being beneficial to ensuring the constant temperature. In an embodiment of the present application, the portion of the flow guiding tube disposed in the heat conducting liquid may be spirally distributed (for example, as shown in fig. 4) so as to better exchange heat with the heat conducting liquid in the liquid bath.
Referring to fig. 1 and 2, in an embodiment of the present application, the constant pressure control device may include a fluid reservoir, a constant speed and constant pressure pump, and the like. The fluid reservoir may be filled with a fluid; the fluid reservoir may be in communication with the first central bore 141 by a fluid line, the fluid reservoir being operable to supplement pressure and flow rate in the fluid line; a constant-speed constant-pressure pump may be mounted on the fluid line, which may be used to provide constant-pressure control of a combustible ice sample located within the holding device with the fluid.
In one embodiment of the present application, the data processing apparatus may refer to a dedicated device (e.g., a general-purpose computer platform installed with specific data processing software), and in another embodiment of the present application, the data processing apparatus may also refer to the specific data processing software.
Referring to fig. 7, the method for measuring the porosity of combustible ice under a constant pressure condition based on the above porosity system of combustible ice may include the steps of:
s701, placing the combustible ice sample in a clamping device.
In an embodiment of the present application, before step S701, the prepared combustible ice sample is placed in the holding device, then the temperature of the combustible ice sample in the holding device is controlled by opening the circulating temperature control device, and when the temperature is stabilized at a specified temperature, the T2 spectrum of the combustible ice sample at the specified temperature can be collected by using the nuclear magnetic resonance apparatus. The obtained T2 spectrum may be provided to a data processing device for processing.
S702, maintaining the combustible ice sample at a specified temperature based on a circulating temperature control device, and maintaining the combustible ice sample at a specified pressure based on a constant pressure control device.
In one embodiment of the present application, the pore size distribution of the combustible ice sample can be characterized based on the T2 spectrum, and the porosity of the combustible ice sample can be calculated based on the pore size distribution.
And S703, acquiring a T2 spectrum of the combustible ice sample at a specified temperature and pressure by using a nuclear magnetic resonance device.
In an embodiment of the application, after a nuclear magnetic resonance device is used for collecting a T2 spectrum of the combustible ice sample at a specified temperature, the combustible ice sample can be subjected to constant pressure control at the same temperature and pressure, so as to obtain corresponding displacement parameters.
S704, acquiring the porosity of the combustible ice sample by utilizing a data processing device and a T2 spectrum of the combustible ice sample at a specified temperature and pressure.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a system, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such system, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A system for measuring porosity of combustible ice under constant pressure conditions, comprising:
the clamping device is used for hermetically clamping the combustible ice sample;
the circulating temperature control device is used for maintaining the combustible ice sample at a specified temperature;
a constant pressure control device for maintaining the combustible ice sample at a specified pressure;
the nuclear magnetic resonance equipment is used for acquiring a T2 spectrum of the combustible ice sample at a specified temperature and pressure;
and the data processing device is used for acquiring the porosity of the combustible ice sample according to the T2 spectrum of the combustible ice sample at the specified temperature and pressure.
2. The system for measuring the porosity of combustible ice under constant pressure of claim 1, wherein the transmitting and receiving antenna of the nmr comprises a rf coil built into the holder.
3. The system for measuring porosity of combustible ice under constant pressure of claim 2, wherein the holding means comprises:
a cylindrical housing;
a hollow tube disposed within the cylindrical housing; a flow space is formed between the hollow pipe and the cylindrical shell; the radio frequency coil is sleeved on the hollow pipe;
the cavity tube is arranged in the hollow tube; a flowing space is formed between the cavity tube and the hollow tube;
the plug assemblies are arranged at two ends of the cavity pipe; the plug assembly and the cavity pipe are matched to form a closed cavity for clamping a combustible ice sample.
4. The system for measuring the porosity of combustible ice under constant pressure conditions of claim 3, wherein the plug assembly comprises:
inner plugs arranged at two ends of the cavity pipe;
the inner pressing sleeve is sleeved on each inner plug; flaring ports are arranged at two ends of the cavity tube, and the inner end of the inner pressing sleeve is inserted into the corresponding flaring ports in a matching manner;
the outer pressing sleeve is sleeved on each inner plug; the inner end of each outer pressing sleeve inwards presses the outer end of the corresponding inner pressing sleeve;
a fixed pressing sleeve sleeved on each outer pressing sleeve; the outer wall of the fixed pressing sleeve is in threaded connection with the inner wall of the cylindrical shell; the inner end of each fixed pressing sleeve inwards presses the corresponding outer pressing sleeve;
an outer plug arranged in each outer press sleeve; the outer end of the outer plug extends out of the outer pressing sleeve.
5. The system for measuring the porosity of the combustible ice under the constant pressure condition as claimed in claim 4, wherein each inner plug is internally provided with a first central hole, and both ends of each inner plug are provided with interface grooves matched with the first central hole; and a second central hole for accommodating a fluid pipeline is formed in the outer plug, the size of the second central hole is larger than that of the first central hole, and the fluid pipeline is connected with the corresponding first central hole through a connector groove so as to form a flow guide channel.
6. The system for measuring the porosity of combustible ice under constant pressure conditions as claimed in claim 3, wherein the circulating temperature control device comprises:
a liquid bath tank containing heat-conducting liquid therein;
the circulating pipeline comprises a flow guide pipe, a circulating pump and a constant-speed constant-pressure pump, wherein the flow guide pipe is filled with heat-conducting fluid inside; the flow guide pipe is communicated with the flow space, and one part of the flow guide pipe is arranged in the heat-conducting liquid;
and the temperature control system is used for heating or cooling the heat conducting liquid so as to maintain the combustible ice sample at a specified temperature in a heat transfer mode.
7. The system for measuring the porosity of combustible ice under constant pressure of claim 6, wherein the outer surface of the liquid bath and the outer surface of the draft tube are provided with insulating layers.
8. The system for measuring the porosity of combustible ice under the constant pressure condition of claim 6, wherein the portion of the flow guide pipe arranged in the heat-conducting liquid is spirally distributed.
9. The system for measuring porosity of combustible ice under constant pressure condition of claim 5, wherein the constant pressure control means comprises:
a fluid reservoir filled with a fluid; the fluid reservoir is communicated with the first central hole through a fluid pipeline;
and the constant-speed constant-pressure pump is arranged on the fluid pipeline and is used for performing constant-pressure control on the combustible ice sample in the clamping device by utilizing the fluid.
10. A method for measuring the porosity of combustible ice under constant pressure conditions by using the system of any one of claims 1 to 9, the method comprising:
placing the combustible ice sample in a holding device;
maintaining the combustible ice sample at a specified temperature based on a circulating temperature control device and at a specified pressure based on a constant pressure control device;
acquiring a T2 spectrum of the combustible ice sample at a specified temperature and pressure by using nuclear magnetic resonance equipment;
and acquiring the porosity of the combustible ice sample by utilizing a data processing device and a T2 spectrum of the combustible ice sample at a specified temperature and pressure.
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