CN117705843A - Seepage neutron scattering device and method for simulating stratum in-situ stress condition - Google Patents
Seepage neutron scattering device and method for simulating stratum in-situ stress condition Download PDFInfo
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- CN117705843A CN117705843A CN202410161272.3A CN202410161272A CN117705843A CN 117705843 A CN117705843 A CN 117705843A CN 202410161272 A CN202410161272 A CN 202410161272A CN 117705843 A CN117705843 A CN 117705843A
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The application relates to a seepage neutron scattering device and a seepage neutron scattering method for simulating stratum in-situ stress conditions, and relates to the technical field of oil gas exploitation and carbon dioxide geological storage. Comprising a seepage casing. The seepage shell is provided with a first fluid inlet, a second fluid inlet and a fluid outlet, and an accommodating space is formed inside the seepage shell; the accommodating space is internally provided with a seepage assembly, the seepage assembly is formed by a plurality of elastic pieces and a plurality of neutron penetrating pieces at intervals and distributed in a petal shape, and a seepage cavity is formed in the seepage assembly and used for placing samples for experimental tests; the first fluid inlet and the fluid outlet are both communicated with the seepage cavity, and the second fluid inlet is communicated with the accommodating space. The seepage component in the petal-shaped form can simulate the effect of the sample when the sample is subjected to confining pressure, and solves the problem that the existing neutron scattering device has poor effect of simulating confining pressure.
Description
Technical Field
The invention relates to the technical field of oil gas exploitation and carbon dioxide geological sequestration, in particular to a seepage neutron scattering device and method for simulating stratum in-situ stress conditions.
Background
With the continuous increase of global energy demands, the safe and efficient exploitation of oil and gas resources becomes particularly critical. At the same time, in order to cope with the challenges of climate change, geological sequestration technology of carbon dioxide is also becoming more and more important. Under the background, the application of carbon dioxide to oil and gas resources such as oil displacement, shale gas displacement and the like can not only improve the oil and gas recovery ratio, but also realize geological sequestration of carbon dioxide. It is well understood that migration of the process subsurface fluids in the reservoir pores is critical for safe and efficient hydrocarbon production and carbon dioxide sequestration. At present, methods for experimentally studying fluid flow within nanopores in formations have limitations, particularly under in situ stress conditions. Therefore, developing a lossless technique that accurately simulates the behavior of fluids in nanopores under in-situ stress conditions is an urgent need in the industry.
Neutron scattering technology is an important technical means for studying the nano-pores and mineral components of reservoirs. Therefore, it is necessary to design a device that can simulate the in-situ stress of the stratum and dynamically observe the neutron scattering of the sample in situ to reveal the mechanism of influence of carbon dioxide on the pore structure and mineral composition of the reservoir rock. However, the existing neutron scattering device has poor effect of simulating the confining pressure, so that the sample to be detected cannot be detected by utilizing neutron technology under the effective ground stress condition.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a seepage neutron scattering device and a seepage neutron scattering method for simulating in-situ stress conditions of a stratum, and aims to solve the problem that the existing neutron scattering device is poor in effect of simulating confining pressure.
The seepage neutron scattering device and method for simulating the stratum in-situ stress condition adopt the following technical scheme: a seepage neutron scattering device for simulating in-situ stress conditions of a stratum, comprising:
the seepage shell is used for being penetrated by neutron beams and heated, a first fluid inlet, a second fluid inlet and a fluid outlet are formed in the seepage shell, and a containing space is formed in the seepage shell;
the device comprises a storage space, a plurality of neutron penetrating members, a plurality of elastic members, a plurality of seepage components and a plurality of seepage components, wherein the seepage components are arranged in the storage space and are formed by arranging the plurality of elastic members and the plurality of neutron penetrating members at intervals, the plurality of elastic members and the plurality of neutron penetrating members are distributed in a petal shape integrally, seepage inner cavities are formed in the seepage components, and the seepage inner cavities are used for placing experimental samples;
the first fluid inlet and the fluid outlet are communicated with the seepage cavity, the first fluid inlet is used for injecting experimental fluid into the seepage cavity, the fluid outlet is used for discharging experimental fluid and receiving back pressure, the second fluid inlet is communicated with the accommodating space, and the second fluid inlet is used for introducing confining pressure gas into the accommodating space.
Optionally, the seepage casing includes a fluid injection end cover, a fluid outflow end cover and a cylinder, the cylinder is internally formed with the accommodating space, and the fluid injection end cover and the fluid outflow end cover are respectively arranged at two ends of the cylinder;
the first fluid inlet is arranged on the fluid injection end cover, the fluid outlet is arranged on the fluid outflow end cover, and the second fluid inlet is arranged on the cylinder;
elastic rings are arranged at two ends of the elastic pieces, and the two elastic rings are respectively abutted with the fluid injection end cover and the fluid outflow end cover.
Optionally, the seepage neutron scattering device simulating the stratum in-situ stress condition comprises a neutron scattering component, and is used for emitting a neutron beam to the seepage shell;
the neutron scattering assembly comprises neutron emission sources and detectors, wherein the neutron emission sources and the detectors are respectively arranged on two sides of the seepage shell, the neutron emission sources are used for emitting neutron beams, and the detectors are used for receiving signals;
the neutron penetrating piece is a high-pressure aluminum alloy neutron penetrating piece; and/or the number of the groups of groups,
the elastic piece is a rubber elastic piece; and/or the number of the groups of groups,
the seepage shell is a high-pressure aluminum alloy seepage shell.
Optionally, the seepage neutron scattering device simulating the stratum in-situ stress condition comprises a temperature control assembly, and is used for heating the seepage shell;
the temperature control assembly comprises a heating element, and the heating element is arranged on the seepage shell.
Optionally, the heating element is a semiconductor heating element, and the temperature control assembly further comprises a temperature controller, and the temperature controller is electrically connected with the heating element.
Optionally, the seepage neutron scattering device simulating the stratum in-situ stress condition comprises a confining pressure control assembly, wherein the confining pressure control assembly is communicated with the second fluid inlet and is used for injecting confining pressure gas into the accommodating space;
the confining pressure control assembly includes:
the confining pressure gas cylinder is used for storing confining pressure gas;
one end of the confining pressure pump is connected with the confining pressure gas cylinder, and the other end of the confining pressure pump is connected with the second fluid inlet; the confining pressure pump is used for pumping confining pressure gas in the confining pressure gas cylinder and sending the confining pressure gas into the accommodating space.
Optionally, the confining pressure gas is an inert gas.
Optionally, the seepage neutron scattering device simulating the in-situ stress condition of the stratum comprises a fluid injection assembly, which is communicated with the first fluid inlet and is used for injecting experimental fluid into the seepage shell;
the fluid injection assembly includes:
the injection gas cylinder is used for storing experimental gas;
one end of the gas injection pump is connected with the injection gas cylinder, the other end of the gas injection pump is connected with the first fluid inlet, and the gas injection pump is used for sending the gas in the injection gas cylinder into the seepage cavity;
the injection bottle is used for storing experimental liquid;
one end of the liquid injection pump is connected with the injection bottle, the other end of the liquid injection pump is connected with the first fluid inlet, and the liquid injection pump is used for sending liquid in the injection bottle into the seepage cavity.
Optionally, the seepage neutron scattering device simulating the in-situ stress condition of the stratum comprises:
the back pressure pump is used for controlling the pressure at the outlet of the seepage shell;
the data detection assembly is electrically connected with the neutron scattering assembly, the temperature control assembly, the confining pressure control assembly and the back pressure pump, and is used for controlling the temperature and the pressure in the seepage shell and receiving information acquired by the detector.
A seepage neutron scattering method for simulating in-situ stress conditions of a stratum, which is applied to the seepage neutron scattering device for simulating in-situ stress conditions of the stratum, and comprises the following steps:
filling an experimental sample into the seepage cavity through the first fluid inlet;
injecting confining pressure gas into the accommodating space through the second fluid inlet;
heating the percolation shell;
after the temperature, confining pressure and back pressure reach the required experimental conditions, injecting experimental fluid into the seepage inner cavity;
and transmitting neutron beams to one side of the seepage shell, receiving neutron scattering information at the other side of the seepage shell, and finally obtaining a neutron scattering spectrum.
Compared with the prior art, the embodiment of the invention has the following advantages:
and filling the sample into the seepage cavity, and then introducing confining pressure gas into a containing space between the seepage shell and the seepage assembly, wherein the plurality of elastic pieces and the plurality of neutron penetrating pieces which form the seepage assembly are distributed in a petal shape integrally, the elastic pieces have elasticity, the confining pressure gas can extrude the outer wall of the seepage assembly along with the injection of the confining pressure gas, and each part of the seepage assembly can extrude the sample at the axle center and apply radial stress to the sample. And then heating the seepage shell, when the whole space inside the seepage shell reaches the temperature required by the experiment and the confining pressure and the back pressure also reach the required experimental conditions, introducing experimental fluids such as carbon dioxide and the like into the seepage cavity to a specific pressure, then transmitting neutron beams to one side of the seepage shell, wherein the neutron beams penetrate the seepage shell and are received at the other side, and finally obtaining a neutron scattering spectrum, and obtaining information such as mineral component change, pore structure and the like after the interaction of a sample and the fluids through the neutron scattering spectrum.
The seepage flow component in the petal form can realize better simulation of reservoir stratum in-situ stress, each part of the seepage flow component can apply extrusion force towards the axis direction to a sample after being extruded by confining pressure gas, the effect of the sample when being subjected to confining pressure can be well simulated, and the problem that the effect of the existing neutron scattering device for simulating confining pressure is poor is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a seepage neutron scattering device simulating in-situ stress conditions of a stratum in an embodiment of the application;
FIG. 2 is a schematic diagram of the overall detailed structure of a seepage neutron scattering device simulating in-situ stress conditions of a stratum in an embodiment of the present application;
FIG. 3 is a schematic structural view of heat generating elements of a seepage neutron scattering device simulating in-situ stress conditions of a stratum in the embodiment of the application, which are respectively arranged on a fluid injection end cover and a fluid outflow end cover;
FIG. 4 is an exploded view of a heat generating element of a seepage neutron scattering device simulating in-situ stress conditions of a formation in an embodiment of the present application disposed on a fluid injection end cap and a fluid outflow end cap, respectively;
FIG. 5 is a cross-sectional view of a percolation casing of a percolation neutron scattering device that simulates in-situ stress conditions of a formation according to an embodiment of the present application;
FIG. 6 is a cross-sectional view of a resilient member within a percolation housing of a percolation neutron scattering device simulating an in-situ stress condition of a formation according to an embodiment of the present application;
FIG. 7 is a cross-sectional view of a neutron penetration within a percolation housing of a percolation neutron scattering device simulating an in-situ stress condition of a formation according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a heat generating element of a seepage neutron scattering device in an embodiment of the application disposed on a cylinder to simulate in-situ stress conditions of a formation;
FIG. 9 is a cross-sectional view of a heat generating component of a seepage neutron scattering device in an embodiment of the application disposed on a cylinder to simulate in-situ stress conditions of a formation;
FIG. 10 is a cross-sectional view of different angles of a percolation casing of a percolation neutron scattering device simulating formation-in-situ stress conditions according to an embodiment of the present application;
FIG. 11 is a flow chart of a method of percolation neutron scattering that simulates in-situ stress conditions of a formation in an embodiment of the present application.
Reference numerals illustrate:
1. a percolation shell; 11. a fluid injection end cap; 111. a first fluid inlet; 12. fluid flows out of the end cap; 121. a fluid outlet; 1211. a second valve; 1212. a sixth pipeline; 13. a cylinder; 131. a second fluid inlet; 14. a seepage assembly; 141. an elastic member; 142. a neutron penetrating member; 15. an elastic ring; 2. a neutron scattering assembly; 21. a neutron emission source; 22. a detector; 3. a temperature control assembly; 31. a heat generating member; 311. a communication hole; 4. a fluid injection assembly; 41. a gas injection pump; 42. injecting a gas cylinder; 43. a liquid injection pump; 44. a second pipeline; 45. a third pipeline; 46. a fourth pipeline; 47. a first valve; 5. a confining pressure control assembly; 51. a confining pressure gas cylinder; 52. a confining pressure pump; 53. a first pipeline; 6. a back pressure pump; 61. a seventh pipeline; 7. a data detection component; 71. a first pressure sensor; 711. a fifth line; 72. a second pressure sensor; 721. an eighth pipeline; 73. and a computer.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will make clear and complete descriptions of the technical solutions of the embodiments of the present invention with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present application is described in further detail below in conjunction with the drawings attached to the specification.
The embodiment of the application discloses a seepage neutron scattering device and method for simulating stratum in-situ stress conditions.
As shown in fig. 1, 2, 5, 6 and 7, a seepage neutron scattering device for simulating in-situ stress conditions of a stratum comprises a seepage shell 1, a neutron scattering assembly 2, a temperature control assembly 3, a fluid injection assembly 4, a confining pressure control assembly 5, a backpressure pump 6 and a data detection assembly 7. The seepage casing 1 is used for being penetrated by neutron beams and heated, a first fluid inlet 111, a second fluid inlet 131 and a fluid outlet 121 are arranged on the seepage casing 1, and a containing space is formed inside the seepage casing 1; the neutron scattering assembly 2 is used for emitting neutron beams to the seepage shell 1; the temperature control component 3 is used for heating the seepage shell 1; the fluid injection assembly 4 is communicated with the first fluid inlet 111, and the fluid injection assembly 4 is used for injecting experimental fluid into the seepage casing 1; the confining pressure control assembly 5 is communicated with the second fluid inlet 131, and the confining pressure control assembly 5 is used for injecting confining pressure gas into the accommodating space; the back pressure pump 6 is used for controlling the pressure at the outlet of the seepage casing 1 (namely, the fluid outlet 121); the data detection assembly 7 is electrically connected with the neutron scattering assembly 2, the temperature control assembly 3, the confining pressure control assembly 5 and the back pressure pump 6, and the data detection assembly 7 is used for controlling the temperature and the pressure in the seepage shell 1; the accommodating space is internally provided with a seepage assembly 14, the seepage assembly 14 is formed by a plurality of elastic pieces 141 and a plurality of neutron penetrating pieces 142 which are arranged at intervals, the plurality of elastic pieces 141 and the plurality of neutron penetrating pieces 142 are distributed in a petal shape integrally, a seepage cavity is formed in the seepage assembly 14, and the seepage cavity is used for placing samples for experimental tests; the first fluid inlet 111 and the fluid outlet 121 are both communicated with the seepage cavity, the first fluid inlet 111 is used for injecting experimental fluid into the seepage cavity, the fluid outlet 121 is used for discharging experimental fluid and receiving back pressure, the second fluid inlet 131 is communicated with the accommodating space, and the second fluid inlet 131 is used for introducing confining pressure gas into the accommodating space. The sample in the application is a porous medium such as a core.
After the sample is filled into the seepage cavity, the confining pressure control assembly 5 is started, confining pressure gas is introduced into the accommodating space between the seepage shell 1 and the seepage assembly 14, and as the plurality of elastic pieces 141 and the plurality of neutron penetrating pieces 142 which form the seepage assembly 14 are distributed in a petal shape and the elastic pieces 141 have elasticity, the confining pressure gas can squeeze the outer wall of the seepage assembly 14 along with the injection of confining pressure gas, and each part of the seepage assembly 14 can squeeze the sample at the axial center, and radial stress is applied to the sample. And then starting the temperature control assembly 3 to heat the seepage shell 1, after the whole space inside the seepage shell 1 reaches the temperature required by the experiment and the confining pressure and the back pressure also reach the required experimental conditions, introducing experimental fluids such as carbon dioxide and the like into the seepage cavity through the fluid injection assembly 4 to a specific pressure, starting the neutron scattering assembly 2, and penetrating the seepage shell 1 by the neutron scattering assembly to measure the mineral component changes after the interaction of the sample and the fluid injected by the fluid injection assembly 4, wherein the changes can be collected in real time by the data detection assembly 7, and finally, a neutron scattering map is generated.
The seepage flow assembly 14 of petal form in this application can realize the better simulation of reservoir normal position stratum stress, and seepage flow assembly 14 all can apply the extrusion force towards the axle center direction to the sample after receiving the extrusion of confining pressure gas, and the effect when the sample received confining pressure can be fine simulated out, has solved the poor problem of effect of current neutron scattering device simulation confining pressure.
As shown in fig. 3, 4, 5, 6, 7 and 10, the percolation housing 1 includes a fluid injection end cap 11, a fluid outflow end cap 12 and a cylinder 13, a receiving space is formed in the cylinder 13, and the fluid injection end cap 11 and the fluid outflow end cap 12 are respectively disposed at two ends of the cylinder 13.
The first fluid inlet 111 is provided on the fluid injection end cap 11, the fluid outlet 121 is provided on the fluid outflow end cap 12, and the second fluid inlet 131 is provided on the cylinder 13.
Elastic rings 15 are arranged at two ends of the plurality of elastic pieces 141, and the two elastic rings 15 are respectively abutted with the fluid injection end cover 11 and the fluid outflow end cover 12.
Specifically, the overall shape of the seepage casing 1 and the seepage assembly 14 is cylindrical, and the seepage assembly 14 is coaxially arranged with the seepage casing 1 in the accommodating space. The fluid injection end cap 11, the fluid outflow end cap 12 and the cylinder 13 are detachably connected, for example, the fluid injection end cap 11 and the fluid outflow end cap 12 may be respectively screwed with the cylinder 13, and the connection manner of the fluid injection end cap 11, the fluid outflow end cap 12 and the cylinder 13 is not limited.
The first fluid inlet 111 and the fluid outlet 121 are located at the center of the fluid injection end cap 11 and the fluid outflow end cap 12, respectively, and the second fluid inlet 131 is provided on the outer wall of the cylinder 13 at a position close to the fluid injection end cap 11.
Each of the elastic members 141 and each of the neutron transparent members 142 is shaped like a column having a sector-shaped cross-sectional area, and in this embodiment, the inner diameter and the outer diameter of each of the elastic members 141 and each of the neutron transparent members 142 are the same. And the volume of each elastic member 141 is the same, and the volume of each neutron penetrating member 142 is the same. The seepage assembly 14 is formed by circumferentially arranging a plurality of elastic pieces 141 and a plurality of neutron penetrating pieces 142 at intervals, namely, a seepage cavity is formed by surrounding the plurality of elastic pieces 141 and the plurality of neutron penetrating pieces 142, the seepage cavity is a channel with two communicated ends, and openings at the two ends of the seepage cavity are positioned at the center of the seepage assembly 14.
The two elastic rings 15 are respectively sleeved at two ends of the seepage assembly 14, the inner wall of each elastic ring 15 is connected with the side wall of each elastic piece 141 on the seepage assembly 14, and each neutron penetrating piece 142 is embedded between two adjacent elastic pieces 141.
Along with the continuous introduction of confining pressure gas into the accommodating space between the seepage casing 1 and the seepage assembly 14, the confining pressure gas can squeeze the outer walls of the elastic piece 141 and the neutron penetrating piece 142, and the elastic piece 141 can be squeezed and compressed by the neutron penetrating pieces 142 on two sides due to the elasticity of the elastic piece 141, so that the volume of the elastic piece 141 is compressed, and finally, the space of the seepage cavity is reduced, so that a sample in the seepage cavity can be subjected to radial extrusion force (namely confining pressure) from the periphery.
Elastic rings 15 at two ends of the seepage assembly 14 are respectively abutted with the fluid injection end cover 11 and the fluid outflow end cover 12, so that good isolation between the seepage cavity and the accommodating space can be ensured, and the confining pressure gas in the accommodating space is prevented from entering the seepage cavity.
The seepage assembly 14 is simple in structure and good in controllability, can freely adjust the size of the needed confining pressure along with the injection amount of confining pressure gas, and can simulate the in-situ stress of the bottom layer. And, the petal-shaped structure of the elastic element 141 and the neutron penetrating element 142 increases the contact area of the elastic element 141 and the neutron penetrating element 142, so that the elastic element 141 and the neutron penetrating element 142 are tightly clung to each other in the process of mutual extrusion, and the structure has a good isolation effect, and can effectively prevent confining pressure gas from entering into a seepage cavity.
Before the experiment starts, the fluid outflow end cover 12 is firstly installed with the cylinder 13, then the seepage assembly 14 is installed in the accommodating space, the seepage assembly 14 and the cylinder 13 are coaxially arranged, then the sample is filled into the seepage cavity, and finally the fluid injection end cover 11 is installed with the cylinder 13, so that the whole installation of the seepage shell 1 is realized, and the method is simple and quick.
The elastic member 141 is a rubber elastic member; the elastic ring 15 is a rubber elastic ring; the seepage shell 1 is a high-pressure aluminum alloy seepage shell; neutron penetrator 142 is a high pressure aluminum alloy neutron penetrator.
The elastic member 141 and the elastic ring 15 are made of rubber, so that the elasticity of the elastic member 141 and the elastic ring 15 can be increased, and the compressibility of the seepage assembly 14 and the tightness of the whole seepage assembly 14 are ensured.
Because neutron beam can penetrate high-pressure aluminum alloy, so that the seepage casing 1 adopts high-pressure aluminum alloy material, namely the fluid injection end cover 11, the fluid outflow end cover 12 and the cylinder 13 are all made of high-pressure aluminum alloy material, and the neutron penetrating piece 142 also adopts high-pressure aluminum alloy material, so that neutron beam can successfully penetrate the seepage casing 1, neutron attenuation is reduced, and more neutrons are ensured to penetrate the sample to obtain signals.
The high-pressure aluminum alloy has good pressure resistance and is well matched with the high-pressure experimental environment of the seepage shell 1.
The material used for the percolation casing 1 and the neutron penetration element 142 in the present application is not limited to a high-pressure aluminum alloy, and any metal or alloy having high pressure resistance and good neutron penetration may be used.
As shown in fig. 1 and 2, the confining pressure control assembly 5 includes:
a confining pressure gas cylinder 51 for storing confining pressure gas;
a confining pressure pump 52, one end of which is connected with the confining pressure gas cylinder 51, and the other end of which is connected with the second fluid inlet 131; the confining pressure pump is used for pumping confining pressure gas in the confining pressure gas cylinder 51 and sending the confining pressure gas into the accommodating space;
specifically, a first pipeline 53 is provided, one end of the first pipeline 53 is communicated with the second fluid inlet 131, and the other end is sequentially communicated with the confining pressure pump 52 and the confining pressure gas cylinder 51. The confining pressure gas emitted by the confining pressure gas cylinder 51 can enter the accommodating space through the second fluid inlet 131 under the power provided by the confining pressure pump 52.
Along with the continuous entering of the confining pressure gas in the accommodating space, the extrusion degree of the seepage assembly 14 is continuously enhanced, namely the confining pressure of the sample is also continuously enhanced, so that the confining pressure of the sample can be controlled by controlling the exhaust amount of the confining pressure gas cylinder 51.
In a preferred embodiment, in order to improve the accuracy of experimental data measurement and expand the detection range of the experiment, before the confining gas is introduced into the accommodating space, the accommodating space can be pumped out through the second fluid inlet 131, so that the accommodating space is in a vacuum environment, and thus, the influence or error on the experimental effect to a certain extent due to the existence of air in the accommodating space can be avoided, the initial confining pressure can be ensured to be from 0, and the detection range of the experiment can be expanded.
In a preferred embodiment, the confining pressure gas is an inert gas in order to ensure that the neutron beam can successfully penetrate the sample, since the inert gas has a smaller influence on the penetrability of the neutron beam. And the inert gas can maintain stable chemical properties even under high-temperature and high-pressure environment. The inert gas comprises any one or more of nitrogen, helium or argon, and in order to reduce the experiment cost, the nitrogen can be selected as confining pressure gas. The type of inert gas selected is not limited herein.
The neutron scattering assembly 2 comprises a neutron emission source 21 and a detector 22 arranged on both sides of the percolation casing 1, the neutron emission source 21 being for emitting a neutron beam and the detector 22 being for receiving a signal.
The detector 22 is electrically connected to the data detection assembly 7.
Specifically, the neutron emission source 21 and the detector 22 are disposed on both sides of the cylinder 13, respectively. Because the neutron beam can penetrate the high pressure aluminum alloy, the percolation housing 1 needs to be rotated before the experiment starts to ensure that the neutron penetrating member 142 made of the high pressure aluminum alloy is positioned on the emission path of the neutron beam, so as to reduce the attenuation of neutrons, and more neutrons penetrate the sample and are received by the detector 22 at the other side of the high pressure percolation housing.
Compared with the prior art, the neutron scattering technology can be used for measuring information such as nanoscale porosity, pore connectivity and the like, and mineral composition change after interaction of carbon dioxide with minerals, water and organic matters in the rock, so that the sealing capacity and stability of reservoir rock are evaluated.
As shown in fig. 1 and 2, the temperature control assembly 3 includes a heat generating member 31, and the heat generating member 31 is provided on the percolation housing 1.
Specifically, in a preferred embodiment, two heat generating elements 31 are provided, and the two heat generating elements 31 are respectively provided on the fluid injection end cover 11 and the fluid outflow end cover 12.
The whole shape of the heating element 31 is a circular cap, two heating elements 31 are respectively sleeved on the fluid injection end cover 11 and the fluid outflow end cover 12, a communication hole 311 is arranged at the center of each heating element 31, and the communication holes 311 on the two heating elements 31 are respectively communicated with the first fluid inlet 111 and the fluid outlet 121.
When the temperature control assembly 3 works, the heating elements 31 generate heat, and as the two heating elements 31 are wrapped at the two ends of the seepage casing 1, the heat generated on the heating elements 31 is transferred to the fluid injection end cover 11, the fluid outflow end cover 12, the cylinder 13 and the seepage assembly 14 in a heat conduction mode, and finally, the temperature required by experiments is reached at all positions inside the seepage casing 1.
The two ends of the seepage shell 1 are provided with the heating pieces 31, so that the heat transfer rate of heat conduction can be increased, and the working efficiency of the whole experiment is improved.
And the two heating elements 31 are respectively sleeved on the fluid injection end cover 11 and the fluid outflow end cover 12, so that the neutron beam can be prevented from being blocked by the heating elements 31, and the neutron beam can not penetrate through the seepage shell 1 and the seepage assembly 14.
As shown in fig. 8 and 9, in another preferred embodiment, a plurality of heat generating members 31 are provided, and the plurality of heat generating members 31 are disposed at intervals on the outer circumference of the cylinder 13.
In order to prevent the heat generating elements 31 from being disposed in the cylinder 13 and affecting the penetrability of the neutron beam, the heat generating elements 31 are disposed in correspondence with one of the elastic elements 141 on the outer periphery of the cylinder 13.
In the present embodiment, the heat generating elements 31 are curved arc plates, and four heat generating elements 31 are provided, and each heat generating element 31 has an elastic element 141 corresponding thereto.
In order to maximize the heat transfer efficiency between the heat generating elements 31 and the seepage casing 1, the coverage area of each heat generating element 31 on the cylinder 13 is equal to the projection area of the reverse extension lines of the two inclined sides of each corresponding elastic element 141 on the cylinder 13.
The heat generating member 31 is a semiconductor heat generating member.
Specifically, the semiconductor material has a thermoelectric effect, and the heat-generating member 31 is made of a semiconductor material, which can be rapidly heated by the thermoelectric effect of the semiconductor material.
The temperature control assembly 3 further comprises a temperature controller electrically connected with each heating element 31, and the temperature controller heats the heating elements 31 through the thermoelectric effect of the semiconductor and can adjust the temperature according to the experimental requirement.
It should be noted that, in the conventional temperature measurement method, a thermocouple placed near the sample is used to measure the temperature. For insulation, a ceramic tube is also required to be sleeved outside the thermocouple wires. The thermocouple with the ceramic tube is generally passed through the sealing pad, the heating tube and the pressure medium to reach the sample. The disadvantage of this method is that it breaks the integrity of the assembly, which affects its stability, and in addition the thermocouple wires placed horizontally are easily crushed, which makes the temperature measurement fail.
Therefore, compared with the existing temperature control equipment, the temperature control precision and stability are high, and the service life and the maintenance are long; the volume is small and the flexibility is high; the working temperature range is wide, and the environment is protected.
As shown in fig. 1 and 2, the fluid injection assembly 4 includes a gas injection pump 41, an injection gas cylinder 42, a liquid injection pump 43, and an injection liquid cylinder.
The injection cylinder 42 is used to store the experimental gas.
The gas injection pump 41 has one end connected to the injection gas cylinder 42 and the other end connected to the first fluid inlet 111, and the gas injection pump 41 is used for feeding the gas in the injection gas cylinder 42 into the seepage chamber.
The injection bottle is used for storing experimental liquid.
One end of the liquid injection pump 43 is connected with the injection bottle, the other end is connected with the first fluid inlet 111, and the liquid injection pump 43 is used for sending liquid in the injection bottle into the seepage cavity.
Specifically, a second line 44 and a third line 45 are provided, the gas injection pump 41 and the injection gas cylinder 42 are connected through the second line 44, and the gas injection pump 41 communicates with the first fluid inlet 111.
The liquid syringe pump 43 and the injection bottle are connected by a third line 45, and the liquid syringe pump 43 communicates with the first fluid inlet 111.
In a preferred embodiment, the second line 44 and the third line 45 are in communication via a first valve 47, and the first valve 47 is further connected to a fourth line 46, the fourth line 46 being in communication with the first fluid inlet 111. In this embodiment, the gas in the injection cylinder 42 is carbon dioxide, and the liquid in the injection cylinder is brine.
At the beginning of the experiment, under the power provided by the gas injection pump 41 and the liquid injection pump 43, the injection gas bottle 42 and the injection liquid bottle sequentially inject carbon dioxide and saline into the seepage cavity through the second pipeline 44 and the third pipeline 45 so as to simulate mineralization reaction with rock and provide necessary experiment conditions required by neutron scattering spectrum of the collected sample.
The back pressure pump 6 is connected with the fluid outlet 121, and the back pressure of the seepage cavity in the experimental process can be controlled by controlling the pressure of the back pressure pump 6.
The data detection assembly 7 includes a first pressure sensor 71, a second pressure sensor 72, and a computer 73. The first pressure sensor 71 and the second pressure sensor 72 are electrically connected to the computer 73, respectively, so that pressure data detected by the first pressure sensor 71 and the second pressure sensor 72 can be transmitted to the computer 73.
The first valve 47 is a four-way valve in this embodiment, a fifth line 711 is further connected to the first valve 47, and the first pressure sensor 71 is disposed on the fifth line 711. The first pressure sensor 71 may detect the pressure at the first fluid inlet 111.
A second valve 1211 is disposed at the fluid outlet 121, the second valve 1211 being a three-way valve, the second valve 1211 being in communication with the fluid inlet via a sixth line 1212; the second valve 1211 communicates with the back pressure pump 6 through a seventh line 61; the second valve 1211 is connected to the second pressure sensor 72 via an eighth line 721.
The second valve 1211 is configured such that the back pressure pump 6 can control the back pressure of the permeate lumen during the experiment through the second valve 1211, and the second pressure sensor 72 can detect the pressure at the fluid outlet 121.
The computer 73 is electrically connected to the confining pressure pump 52, the neutron emission source 21, the detector 22, the temperature controller, and the back pressure pump 6, respectively. The computer 73 can control the emission and closing of neutrons, the receiving of neutron detection information and the control of the pressure (including confining pressure and back pressure) and the temperature in the seepage casing 1 during experiments.
In a preferred embodiment, the fluid injection assembly 4 is also electrically connected to the computer 73, i.e. the gas injection pump 41 and the liquid injection pump 43 are electrically connected to the computer 73, respectively, so that the computer 73 can control the injection and closing of carbon dioxide and brine in the fluid injection assembly 4.
The seepage neutron scattering device simulating the stratum in-situ stress condition has the working principle that: after the sample is filled into the seepage cavity, the seepage shell 1 is assembled, the confining pressure control assembly 5 is started, inert gas is introduced into the accommodating space between the seepage shell 1 and the seepage assembly 14, and as a plurality of elastic pieces 141 and a plurality of neutron penetrating pieces 142 which form the seepage assembly 14 are distributed in a petal shape and the elastic pieces 141 have elasticity, the confining pressure gas can extrude the outer wall of the seepage assembly 14 along with the injection of confining pressure gas, and each part of the seepage assembly 14 can extrude the sample at the axle center, and radial stress is applied to the sample. In this process, the computer 73 controls the amount of the introduced confining pressure gas so that the confining pressure reaches the required value of the experiment. The temperature control assembly 3 is then turned on to heat the percolation housing 1 until the desired temperature for the experiment is reached. The back pressure pump 6 is then activated, and the back pressure pump 6 controls the pressure at the outlet of the permeate cavity. The neutron emitting source 21 emits a neutron beam after the neutron scattering assembly 2 is activated by introducing experimental, e.g., carbon dioxide and brine, to a specific pressure through the fluid injection assembly 4 into the percolation bore. The neutron beam penetrates through the seepage casing 1 and the sample in the seepage casing, the neutron beam is finally received by the detector 22, neutron scattering information received by the detector 22 is uploaded to the computer 73 and is finally processed by the computer 73 data to obtain a neutron scattering spectrum, and the information such as nanoscale porosity, pore connectivity and the like and the mineral composition change after interaction of carbon dioxide with minerals, water and organic matters in the rock can be analyzed and measured through the neutron scattering spectrum, so that the sealing capacity and stability of the reservoir rock are evaluated.
It should be noted that the high-pressure seepage neutron scattering device simulating the in-situ stress condition of the bottom layer can study the interaction of carbon dioxide and reservoir rock under the in-situ stress condition of the stratum, and the change rule of reservoir pores and rock mineral components. Neutron scattering techniques can be used to measure nanoscale porosity, pore connectivity, and other information, as well as changes in mineral composition after interaction of carbon dioxide with minerals, water, and organics in the rock, to assess the sequestration capacity and stability of reservoir rock.
The distribution and migration of nanoscale carbon dioxide in reservoir rock under in situ stress conditions of the formation can also be studied. Neutron scattering techniques can be used to monitor the spatial distribution and temporal variation of carbon dioxide in reservoir rock, as well as the migration behavior of carbon dioxide under different pressure, temperature and water chemistry conditions, to assess the sequestration efficiency and safety of reservoir rock.
And researching the mechanical properties of carbon dioxide and reservoir rock. Neutron scattering techniques can be used to measure the stress, strain, cracking and deformation induced by carbon dioxide in reservoir rock, as well as the interaction of carbon dioxide with microcracks and pores in the rock, to assess the mechanical strength and integrity of the reservoir rock.
As shown in fig. 11, the invention also discloses a seepage neutron scattering method for simulating the in-situ stress condition of the stratum, which comprises the following steps:
s100, filling an experimental sample into the seepage cavity through the first fluid inlet.
S200, injecting confining pressure gas into the accommodating space through the second fluid inlet.
S300, heating the seepage shell.
S400, injecting experimental fluid into the seepage cavity after the temperature, the confining pressure and the back pressure reach the required experimental conditions.
S500, emitting neutron beams to one side of the seepage shell, receiving neutron scattering information at the other side of the seepage shell, and finally obtaining a neutron scattering spectrum.
In summary, a seepage neutron scattering device for simulating in-situ stress conditions of a stratum comprises a seepage shell 1, a neutron scattering component 2, a temperature control component 3, a fluid injection component 4, a confining pressure control component 5, a backpressure pump 6 and a data detection component 7. The seepage casing 1 is used for being penetrated by neutron beams and heated, a first fluid inlet 111, a second fluid inlet 131 and a fluid outlet 121 are arranged on the seepage casing 1, and a containing space is formed inside the seepage casing 1; the neutron scattering assembly 2 is used for emitting neutron beams to the seepage shell 1; the temperature control component 3 is used for heating the seepage shell 1; the fluid injection assembly 4 is communicated with the first fluid inlet 111, and the fluid injection assembly 4 is used for injecting experimental fluid into the seepage casing 1; the confining pressure control assembly 5 is communicated with the second fluid inlet 131, and the confining pressure control assembly 5 is used for injecting confining pressure gas into the accommodating space; the back pressure pump 6 is used for controlling the pressure at the outlet of the seepage casing 1 (namely, the fluid outlet 121); the data detection assembly 7 is electrically connected with the neutron scattering assembly 2, the temperature control assembly 3, the confining pressure control assembly 5 and the back pressure pump 6, and the data detection assembly 7 is used for controlling the temperature and the pressure in the seepage shell 1; the accommodating space is internally provided with a seepage assembly 14, the seepage assembly 14 is formed by a plurality of elastic pieces 141 and a plurality of neutron penetrating pieces 142 which are arranged at intervals, the plurality of elastic pieces 141 and the plurality of neutron penetrating pieces 142 are distributed in a petal shape integrally, a seepage cavity is formed in the seepage assembly 14, and the seepage cavity is used for placing samples for experimental tests; the first fluid inlet 111 and the fluid outlet 121 are both communicated with the seepage cavity, the first fluid inlet 111 is used for injecting experimental fluid into the seepage cavity, the fluid outlet 121 is used for discharging experimental fluid and receiving back pressure, the second fluid inlet 131 is communicated with the accommodating space, and the second fluid inlet 131 is used for introducing confining pressure gas into the accommodating space. The sample in the application is a porous medium such as a core.
After the sample is filled into the seepage cavity, the confining pressure control assembly 5 is started, confining pressure gas is introduced into the accommodating space between the seepage shell 1 and the seepage assembly 14, and as the elastic pieces 141 and the neutron penetrating pieces 142 which form the seepage assembly 14 are distributed in a petal shape and the elastic pieces 141 have elasticity, the confining pressure gas can squeeze the outer wall of the seepage assembly 14 along with the injection of the confining pressure gas, and each part of the seepage assembly 14 can squeeze the sample at the axial center, and radial stress is applied to the sample. And then starting the temperature control assembly 3 to heat the seepage shell 1, after the whole space inside the seepage shell 1 reaches the temperature required by the experiment and the confining pressure and the back pressure also reach the required experimental conditions, introducing experimental fluids such as carbon dioxide and the like into the seepage cavity through the fluid injection assembly 4 to a specific pressure, starting the neutron scattering assembly 2, and penetrating the seepage shell 1 by the neutron scattering assembly to measure the mineral component changes after the interaction of the sample and the fluid injected by the fluid injection assembly 4, wherein the changes can be collected in real time by the data detection assembly 7, and finally, a neutron scattering map is generated.
The seepage flow assembly 14 of petal form in this application can realize the better simulation of reservoir normal position stratum stress, and seepage flow assembly 14 all can apply the extrusion force towards the axle center direction to the sample after receiving the extrusion of confining pressure gas, and the effect when the sample received confining pressure can be fine simulated out, has solved the poor problem of effect of current neutron scattering device simulation confining pressure.
It should be noted that, without conflict, the embodiments and features of the embodiments in the present application may be combined with each other.
It should be noted that, the specific structure and working principle of the present invention are described by taking a seepage neutron scattering device and method for simulating the in-situ stress condition of the stratum as an example, but the application of the present invention is not limited by the seepage neutron scattering device and method for simulating the in-situ stress condition of the stratum, and the present invention can also be applied to the production and the use of other similar workpieces.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A seepage neutron scattering device for simulating in-situ stress conditions of a stratum, comprising:
the seepage shell is used for being penetrated by neutron beams and heated, a first fluid inlet, a second fluid inlet and a fluid outlet are formed in the seepage shell, and a containing space is formed in the seepage shell;
the device comprises a storage space, a plurality of neutron penetrating members, a plurality of elastic members, a plurality of seepage components and a plurality of seepage components, wherein the seepage components are arranged in the storage space and are formed by arranging the plurality of elastic members and the plurality of neutron penetrating members at intervals, the plurality of elastic members and the plurality of neutron penetrating members are distributed in a petal shape integrally, seepage inner cavities are formed in the seepage components, and the seepage inner cavities are used for placing experimental samples;
the first fluid inlet and the fluid outlet are communicated with the seepage cavity, the first fluid inlet is used for injecting experimental fluid into the seepage cavity, the fluid outlet is used for discharging experimental fluid and receiving back pressure, the second fluid inlet is communicated with the accommodating space, and the second fluid inlet is used for introducing confining pressure gas into the accommodating space.
2. The seepage neutron scattering device for simulating formation in-situ stress conditions according to claim 1, wherein the seepage shell comprises a fluid injection end cover, a fluid outflow end cover and a barrel, the accommodating space is formed in the barrel, and the fluid injection end cover and the fluid outflow end cover are respectively arranged at two ends of the barrel;
the first fluid inlet is arranged on the fluid injection end cover, the fluid outlet is arranged on the fluid outflow end cover, and the second fluid inlet is arranged on the cylinder;
elastic rings are arranged at two ends of the elastic pieces, and the two elastic rings are respectively abutted with the fluid injection end cover and the fluid outflow end cover.
3. The apparatus of claim 2, wherein the apparatus comprises a neutron scattering assembly for emitting a neutron beam toward the percolation housing;
the neutron scattering assembly comprises neutron emission sources and detectors, wherein the neutron emission sources and the detectors are respectively arranged on two sides of the seepage shell, the neutron emission sources are used for emitting neutron beams, and the detectors are used for receiving signals;
the neutron penetrating piece is a high-pressure aluminum alloy neutron penetrating piece; and/or the number of the groups of groups,
the elastic piece is a rubber elastic piece; and/or the number of the groups of groups,
the seepage shell is a high-pressure aluminum alloy seepage shell.
4. A seepage neutron scattering device for simulating formation in-situ stress conditions according to claim 3, wherein the seepage neutron scattering device for simulating formation in-situ stress conditions comprises a temperature control component for heating the seepage shell;
the temperature control assembly comprises a heating element, and the heating element is arranged on the seepage shell.
5. The seepage neutron scattering device for simulating formation in-situ stress conditions according to claim 4, wherein the heating element is a semiconductor heating element, and the temperature control assembly further comprises a temperature controller electrically connected with the heating element.
6. The apparatus of claim 4, wherein the apparatus comprises a confining pressure control assembly in communication with the second fluid inlet, the confining pressure control assembly configured to inject confining pressure gas into the receiving space;
the confining pressure control assembly includes:
the confining pressure gas cylinder is used for storing confining pressure gas;
one end of the confining pressure pump is connected with the confining pressure gas cylinder, and the other end of the confining pressure pump is connected with the second fluid inlet; the confining pressure pump is used for pumping confining pressure gas in the confining pressure gas cylinder and sending the confining pressure gas into the accommodating space.
7. The apparatus of claim 6, wherein the confining pressure gas is an inert gas.
8. The apparatus of claim 1, wherein the apparatus comprises a fluid injection assembly in communication with the first fluid inlet, the fluid injection assembly configured to inject an experimental fluid into the percolation housing;
the fluid injection assembly includes:
the injection gas cylinder is used for storing experimental gas;
one end of the gas injection pump is connected with the injection gas cylinder, the other end of the gas injection pump is connected with the first fluid inlet, and the gas injection pump is used for sending the gas in the injection gas cylinder into the seepage cavity;
the injection bottle is used for storing experimental liquid;
one end of the liquid injection pump is connected with the injection bottle, the other end of the liquid injection pump is connected with the first fluid inlet, and the liquid injection pump is used for sending liquid in the injection bottle into the seepage cavity.
9. The apparatus of claim 6, wherein the apparatus comprises:
the back pressure pump is used for controlling the pressure at the outlet of the seepage shell;
the data detection assembly is electrically connected with the neutron scattering assembly, the temperature control assembly, the confining pressure control assembly and the back pressure pump, and is used for controlling the temperature and the pressure in the seepage shell and receiving information acquired by the detector.
10. A method of transudating neutron scattering in a simulated formation in situ stress condition, applied to a transudating neutron scattering device in a simulated formation in situ stress condition as claimed in any of claims 1 to 9, comprising the steps of:
filling an experimental sample into the seepage cavity through the first fluid inlet;
injecting confining pressure gas into the accommodating space through the second fluid inlet;
heating the percolation shell;
after the temperature, confining pressure and back pressure reach the required experimental conditions, injecting experimental fluid into the seepage inner cavity;
and transmitting neutron beams to one side of the seepage shell, receiving neutron scattering information at the other side of the seepage shell, and finally obtaining a neutron scattering spectrum.
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|---|---|
| CN117705843B (en) | 2024-04-16 |
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