CN113740224B - Method for identifying micro-dynamic pores in porous medium seepage process - Google Patents
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Abstract
The invention discloses a method for identifying micro-dynamic pores in a porous medium seepage process, which comprises the following steps: partitioning the geometric structure of the porous medium, and dividing the porous medium into a plurality of pore partitions; acquiring a velocity field after the flow in the porous medium reaches a steady state; releasing the tracer particles at the inlet of the porous medium, and acquiring information of all pore partitions through which the tracer particles pass when flowing to the outlet of the porous medium under a steady-state velocity field in the porous medium; and visualizing all pore partitions passed by the tracer particles by utilizing the information of all pore partitions passed by the tracer particles, so as to realize the identification of the micro-dynamic pores in the seepage process of the porous medium. According to the invention, the pore area affected by the micro flow in the porous medium can be identified through pore partition and tracing particles.
Description
Technical Field
The invention belongs to the technical field of petroleum development, and particularly relates to a method for identifying micro-dynamic pores in a porous medium seepage process.
Background
As petroleum is used as a national strategic resource, the improvement of the petroleum recovery ratio is always an important means for ensuring the national strategic safety. In the current oil field, the oil field mostly enters a high water content and extra-high water content period, and a large amount of water-drive exploitation in the early stage leads to that only part of fluid in pores in the zone formation participates in flowing, so that a fixed seepage path is formed, the water content of produced liquid of the zones is continuously increased, and the recovery ratio is continuously reduced. The existing technology for improving the recovery efficiency is mainly realized by changing the original seepage path, for example, viscoelastic particle flooding is realized by plugging the original seepage path by viscoelastic particles, so that the swept area range of water is enlarged, and the used pores in the stratum are increased, thereby achieving the purpose of improving the recovery efficiency. The extraction of the swept areas and the identification of the mobile pores are of great significance to the research of the mechanism and the effect of the recovery efficiency improving technology.
At present, the method for extracting and identifying pores for use through a seepage field mainly analyzes a velocity field in a seepage process, a velocity threshold is given, and a region which is larger than the threshold in the velocity field is considered as a seepage region. However, this method cannot accurately extract and identify the effective exploding pores, and a part of the fluid in the region where the velocity is greater than the threshold value finally flows to the static region (unswept region), which is not the effective exploding pores, and the existing method cannot accurately eliminate the region. Therefore, a method for identifying micro-dynamic pores in the seepage process of the porous medium is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for identifying micro pores in a porous medium seepage process.
The purpose of the invention is realized by the following technical scheme:
a method for identifying micro-dynamic pores in a porous medium seepage process comprises the following steps:
partitioning the geometric structure of the porous medium, and dividing the porous medium into a plurality of pore partitions;
obtaining a velocity field after the flow in the porous medium reaches a steady state;
releasing the trace particles at the inlet of the porous medium, and acquiring information of all pore partitions through which the trace particles pass when flowing to the outlet of the porous medium under a steady-state velocity field in the porous medium;
and visualizing all pore partitions passed by the tracer particles by utilizing the information of all pore partitions passed by the tracer particles, so as to realize the identification of the micro-dynamic pores in the seepage process of the porous medium.
Preferably, the geometry of the porous medium comprises a plurality of pores and a throat connecting any two adjacent pores,
preferably, when the geometric structure of the porous medium is partitioned, the central axis of the pore is extracted by using a maximum sphere method to serve as a pore network, lattice points of the pore network are pores, the sides of the pore network are channels, and the place with the smallest pore diameter is a throat position;
and the pores are divided from the throat according to the central axes of the pores to form a plurality of pore partitions.
Preferably, when the velocity field of the flow in the porous medium after reaching the steady state is obtained, the stable velocity field data at the moment when the seepage path needs to be extracted is obtained according to a preset oil displacement calculation example.
Preferably, the tracer particles are applied as points of collision-free volume; the movement speed of the tracer particles at a certain moment is obtained by interpolation of the tracked fluid velocity field at the current positions of the tracer particles, and the tracer particles are in complete elastic collision after touching the wall surface.
Preferably, the step of releasing the tracer particles at the inlet of the porous medium and obtaining information of all pore partitions through which the tracer particles flow to the outlet of the porous medium under the steady-state velocity field in the porous medium comprises:
and releasing tracer particles at the inlet of the porous medium, tracking the movement of the tracer particles by using a Lagrange method until no tracer particles flow out from the outlet of the porous medium, and counting the number of the tracer particles flowing out of all calculation domains of the porous medium and the number of the tracer particles flowing out of the calculation domain finally in each pore partition.
Preferably, the process of visualizing all pore partitions through which the tracer particle passes by using the information of all pore partitions through which the tracer particle passes includes:
and for each pore partition, calculating the ratio of the number of the tracer particles flowing through the pore partition in the final outflow calculation domain to the number of the tracer particles flowing out of all the outflow calculation domains, and visually characterizing the ratio in different pore partitions in the whole calculation domain to realize the identification of micro-dynamic pores in the seepage process of the porous medium.
The invention also provides a system for identifying micro pores in the seepage process of porous media, which comprises the following steps:
a partitioning module: the device is used for partitioning the geometric structure of the porous medium and dividing the porous medium into a plurality of pore partitions;
a velocity field acquisition module: the method is used for acquiring a velocity field after the flow in the porous medium reaches a steady state;
a calculation module: the device is used for releasing the tracer particles at the inlet of the porous medium and acquiring the information of all pore partitions through which the tracer particles pass when flowing to the outlet of the porous medium under a steady-state velocity field in the porous medium;
an identification module: the method is used for visualizing all pore partitions passed by the tracer particles by utilizing the information of all pore partitions passed by the tracer particles, so as to realize the identification of micro-dynamic pores in the seepage process of the porous medium.
The present invention also provides an electronic device, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method for identifying micro-mobile pores in a porous medium percolation process as described above.
The present invention further provides a storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the method for identifying micro-dynamic pores in a porous medium seepage process as described above.
The invention has the following beneficial effects:
the invention aims at the identification method of the microcosmic pores in the seepage process of the porous medium, and aims at the microcosmic seepage process of the porous medium under the condition of obtaining the geometric structure and the internal seepage velocity field of the porous medium: 1) Partitioning the geometric structure of the porous medium to obtain a plurality of pore partitions, and characterizing the pores for use by using the pore partitions to obtain a quantitative characterization result; 2) The method has the advantages that the tracer particles are released and the movement of the tracer particles is tracked for a seepage velocity field, the actual flow condition of the fluid in the porous medium is simulated, only the subareas through which the tracer particles finally flowing out of the porous medium flow are counted, and the result shows that a seepage passage is formed only in the subareas.
Drawings
FIG. 1 is a geometric structure of a porous medium according to an embodiment of the present invention;
FIG. 2 is a diagram of a pore partition of a porous medium in an embodiment of the present invention;
FIG. 3 is a velocity field of a fluid being tracked in an embodiment of the present invention;
FIG. 4 (a) is a particle distribution diagram at time 0s in an example of the present invention, FIG. 4 (b) is a particle distribution diagram at time 0.25s in an example of the present invention, FIG. 4 (c) is a particle distribution diagram at time 0.5s in an example of the present invention, FIG. 4 (d) is a particle distribution diagram at time 0.75s in an example of the present invention, FIG. 4 (e) is a particle distribution diagram at time 1.0s in an example of the present invention, FIG. 4 (f) is a particle distribution diagram at time 1.25s in an example of the present invention, and FIG. 4 (g) is a particle distribution diagram at time 1.5s in an example of the present invention;
FIG. 5 is a plot of the area available for porosity obtained in an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1-5, the method for identifying micro-dynamic pores in the seepage process of a porous medium comprises the following steps:
step 1, for a given porous medium, extracting a central axis of a pore as a pore network by using a maximum sphere method, wherein lattice points of the pore network are pores, edges of the pore network are channels, and the place with the smallest pore diameter in the pore network is a throat position; dividing the pores from the throat according to the central axes of the pores to form a plurality of pore partitions, wherein the throat is an interface between different partitions;
step 2, aiming at a specific oil displacement calculation example, obtaining speed field data of the moment when the seepage path needs to be extracted;
step 3, setting tracer particles, wherein the tracer particles have no collision volume and move along with a fluid velocity field, the movement speed is obtained by interpolation of the velocity field, an index sequence of partitions passed by the tracer particles in the movement process is recorded, and the tracer particles are subjected to complete elastic collision after colliding with the wall surface;
step 4, randomly releasing M particles from the porous medium inlet, tracking the movement of the particles in the pores by using a Lagrange method until no more particles flow out of the calculation domain from the porous medium outlet, and counting the number N of the particles flowing out of all the calculation domains and the number O of the particles flowing out of the calculation domain finally in each pore partition;
and 5, calculating the value of the O/N in each partition, and visually representing the difference of the value in different partitions by different colors in the whole calculation domain.
Through the steps, the movable pore area represented by the O/N value and the relative importance of the movable pore area can be finally obtained, and the identification of the microscopic movable pores in the seepage process of the porous medium is realized.
Examples
The method for identifying micro pores in the porous medium seepage process in this embodiment will be described in detail by taking the porous medium shown in fig. 1 as an example, and includes the following steps:
1. early preparation work:
for a given porous media geometry, two preparations need to be done: namely porous media partitioning and acquisition of the tracked fluid velocity field.
1.1, porous medium partition:
FIG. 1 is a geometric block diagram of a porous media comprising a plurality of pores and a throat connecting any two adjacent pores, the relationship between the pores and the throat being: one aperture is the intersection of three or more throats, one throat connecting two apertures. The porous medium partition is to geometrically divide each pore into the same area, and the boundary of two adjacent areas is the narrowest part of a throat connecting the two pores. After a series of calculation operations, a pore partition map as shown in fig. 2 can be finally obtained, and the connected regions with the same color are the same partition and have unique and non-repeating partition numbers.
1.2 acquisition of velocity field of tracked fluid
Through the calculation of the pretreatment, the velocity field of the tracked fluid after the tracked fluid flows in the porous medium and reaches the steady state is obtained, as shown in fig. 3.
2. Extraction of swept areas:
the extraction of the swept area in the method is realized by releasing trace particles at an inlet of a porous medium, enabling the particles to move in a tracked fluid velocity field according to the velocity of the current position, recording the information of all subareas through which the particles pass, and finally sorting and visualizing the information.
2.1 arrangement of the tracer particles
The tracing particles used in the method are points without collision volume, the movement speed at a certain moment is obtained by interpolation of the tracked fluid speed field at the current position, and complete elastic collision is carried out after the tracing particles touch the wall surface. The trace particle will record the length of time it has been moved and the list of partitions passed during its movement.
2.2 Release and tracking of Trace particles
As shown in fig. 4 (a) -4 (g), particle profiles are shown at different times, releasing 1000 tracer particles at the entrance of the pore structure, which move with the fluid velocity field. And finally, when the calculation reaches a steady state, 194 particles move to the outlet, and the rest particles move to a region with the velocity of 0 in the porous medium and cannot move to the outlet under the action of the velocity of the fluid. Only the moving time lengths of 194 particles which finally move to the outlet and the passing partition list are counted.
2.3 visualization of pore areas
For each pore partition, counting the number of particles flowing through the pore partition and finally moving to the outlet, a pore movement area graph as shown in fig. 5 can be finally obtained, wherein the numbers corresponding to different colors are the ratio of the number of particles flowing through the partition in all the particles moving to the outlet, so that the importance degree of the partition in the whole seepage process can be represented. The larger the value, the larger the number of particles flowing through the partition, the more the partition is the main seepage wave and active area.
Claims (7)
1. A method for identifying micro-dynamic pores in a porous medium seepage process is characterized by comprising the following steps:
partitioning the geometric structure of the porous medium, and dividing the porous medium into a plurality of pore partitions;
acquiring a velocity field after the flow in the porous medium reaches a steady state;
releasing the trace particles at the inlet of the porous medium, and acquiring information of all pore partitions through which the trace particles pass when flowing to the outlet of the porous medium under a steady-state velocity field in the porous medium;
visualizing all pore partitions passed by the tracer particles by utilizing the information of all pore partitions passed by the tracer particles so as to realize the identification of the microcosmic pores in the seepage process of the porous medium;
the tracer particles adopt points without collision volumes; the movement speed of the tracer particles at a certain moment is obtained by interpolation of a tracked fluid speed field at the current positions of the tracer particles, and the tracer particles are in complete elastic collision after touching the wall surface;
the process of releasing the trace particles at the inlet of the porous medium and obtaining the information of all pore partitions through which the trace particles pass when flowing to the outlet of the porous medium under the steady-state velocity field in the porous medium comprises the following steps:
releasing tracer particles at an inlet of the porous medium, tracking the movement of the tracer particles by using a Lagrange method until no tracer particles flow out from an outlet of the porous medium, and counting the number of the tracer particles flowing out of all calculation domains of the porous medium and the number of the tracer particles flowing out of a final outflow calculation domain in each pore partition;
the process of visualizing all pore partitions through which the tracer particle passes by using the information of all pore partitions through which the tracer particle passes includes:
and for each pore partition, calculating the ratio of the number of the tracer particles flowing through the final outflow calculation domain in the pore partition to the number of the tracer particles flowing out of all the outflow calculation domains, and visually representing the ratio in different pore partitions in the whole calculation domain to realize the identification of micro-dynamic pores in the seepage process of the porous medium.
2. The method for identifying micro mobile pores in the seepage process of the porous medium according to claim 1, wherein the geometric structure of the porous medium comprises a plurality of pores and a throat connecting any two adjacent pores.
3. The method for identifying the micro-pores used in the seepage process of the porous medium according to claim 2, wherein when the geometric structure of the porous medium is partitioned, the central axes of the pores are extracted by using a maximum sphere method to serve as a pore network, lattice points of the pore network are pores, edges of the pore network are channels, and the position with the smallest pore diameter is a throat position;
and the pores are divided from the throat according to the central axes of the pores to form a plurality of pore partitions.
4. The method for identifying the micro pores used in the seepage process of the porous medium according to claim 1, wherein when the velocity field after the flow in the porous medium reaches the steady state is obtained, the stable velocity field data at the moment when the seepage path needs to be extracted is obtained according to a preset oil displacement example.
5. To the discernment system of micro-useful pore in porous medium seepage flow process, characterized by, including:
a partitioning module: the device is used for partitioning the geometric structure of the porous medium and dividing the porous medium into a plurality of pore partitions;
a velocity field acquisition module: the method is used for acquiring a velocity field after the flow in the porous medium reaches a steady state;
a calculation module: the device is used for releasing the trace particles at the inlet of the porous medium and acquiring the information of all pore partitions passed by the trace particles when the trace particles flow to the outlet of the porous medium under a steady-state velocity field in the porous medium; the specific process comprises the following steps: releasing tracer particles at an inlet of the porous medium, tracking the movement of the tracer particles by using a Lagrange method until no tracer particles flow out from an outlet of the porous medium, and counting the number of the tracer particles flowing out of all calculation domains of the porous medium and the number of the tracer particles flowing out of a final outflow calculation domain in each pore partition; the tracer particles adopt points without collision volumes; the movement speed of the tracer particles at a certain moment is obtained by interpolation of a tracked fluid speed field at the current positions of the tracer particles, and the tracer particles are in complete elastic collision after touching the wall surface;
an identification module: the method is used for visualizing all pore partitions passed by the tracer particles by utilizing the information of all pore partitions passed by the tracer particles, so as to realize the identification of micro-dynamic pores in the porous medium seepage process, and the specific process comprises the following steps: and for each pore partition, calculating the ratio of the number of the tracer particles flowing through the final outflow calculation domain in the pore partition to the number of the tracer particles flowing out of all the outflow calculation domains, and visually representing the ratio in different pore partitions in the whole calculation domain to realize the identification of micro-dynamic pores in the seepage process of the porous medium.
6. An electronic device, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method for identifying micro-mobile pores in a porous medium percolation process of any one of claims 1 to 4.
7. A storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the method for identifying micro-mobile pores during a porous medium percolation process according to any one of claims 1 to 4.
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