CN113702147A - Core manufacturing method - Google Patents
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- CN113702147A CN113702147A CN202010431639.0A CN202010431639A CN113702147A CN 113702147 A CN113702147 A CN 113702147A CN 202010431639 A CN202010431639 A CN 202010431639A CN 113702147 A CN113702147 A CN 113702147A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
Abstract
The application discloses a rock core manufacturing method, and belongs to the field of oil exploration. The method comprises the following steps: determining main factors influencing the physical properties of bedrocks according to the existing karst cave carbonate reservoir data; determining the composition of each component in the matrix making material according to the main factors influencing the physical properties of the matrix, and obtaining a matrix model of the core to be made; determining the volume of a karst cave in a rock core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave carbonate reservoir data; obtaining a karst cave model of the core to be manufactured according to the volume of the karst cave in the core to be manufactured and manufacturing materials of the karst cave; and embedding the karst cave model into the bedrock model to obtain the core to be manufactured. The method provides a core manufacturing method for a karst cave type carbonate reservoir, and provides an experimental carrier for researching the influence of karst caves in the karst cave type carbonate reservoir on reservoir parameters.
Description
Technical Field
The application relates to the field of petroleum exploration, in particular to a rock core manufacturing method.
Background
The petroleum is stored in the pores of the rock stratum, and the important significance is achieved for guiding petroleum exploitation by observing the characteristics and the distribution condition of the pores of the rock stratum. At present, the rock formation is usually simulated by physical simulation for observation. The experiment model adopted by the physical simulation is mainly a rock core model, and because the natural rock core is difficult to take out, high in cost and limited in quantity, an artificial rock core is usually selected to replace the natural rock core to carry out the physical simulation experiment.
In the related art, a common artificial core manufacturing method is a quartz sand epoxy resin cementing manufacturing method, wherein a cementing agent is used for cementing quartz sand and epoxy resin, and then pressurization and heating are carried out to manufacture a core.
The existing artificial core manufacturing method aims at a conventional sandstone reservoir, the karst cave type carbonate reservoir is different from the conventional sandstone reservoir, the reservoir rock of the conventional artificial core manufacturing method contains a large number of karsts with different sizes and shape characteristics, and the complex karst cave structures have direct influence on the physical and chemical properties of the rock, so that the manufacturing of the artificial core of the karst cave type carbonate reservoir needs to be researched.
Disclosure of Invention
In view of the above, the application provides a core manufacturing method for a karst cave type carbonate reservoir, and provides an experimental carrier for researching the influence of karst caves in the karst cave type carbonate reservoir on reservoir parameters.
Specifically, the method comprises the following technical scheme:
the embodiment of the application provides a core manufacturing method, which comprises the following steps:
determining main factors influencing the physical properties of bedrocks according to the existing karst cave carbonate reservoir data;
determining the composition of each component in the matrix making material according to the main factors influencing the physical properties of the matrix, and obtaining a matrix model of the core to be made;
determining the volume of a karst cave in a rock core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave carbonate reservoir data;
obtaining a karst cave model of the core to be manufactured according to the volume of the karst cave in the core to be manufactured and manufacturing materials of the karst cave;
and embedding the karst cave model into the bedrock model to obtain the core to be manufactured.
Optionally, after determining the main factors affecting the physical properties of the matrix rock according to the existing cavern type carbonate reservoir data, before determining the components of the matrix rock manufacturing material according to the main factors affecting the physical properties of the matrix rock, the method further includes:
and obtaining a bedrock manufacturing material.
Optionally, the bedrock making material includes:
rock sample particles and a cementing agent.
Optionally, the rock sample particles are obtained from outcrop rock samples on the field;
and the region where the outcrop rock sample is located and the region where the karst cave carbonate reservoir is located in the existing karst cave carbonate reservoir data are the same region.
Optionally, the cementing agent is epoxy resin AB glue.
Optionally, the main factors affecting the physical properties of the bedrock include:
the grain size of the rock sample particles, the proportion of the dosage of the cementing agent to the dosage of the rock sample particles and the pressure of the compression molding of the rock core.
Optionally, the particle size of the rock-like particles comprises:
40 meshes, 60 meshes, 80 meshes and 100 meshes.
Optionally, the ratio of the amount of the cementing agent to the amount of the rock sample particles includes:
1:4，1:6，1:8、1:10。
optionally, the pressure for the core compression molding includes:
10MPa、15MPa、20MPa、25MPa、30MPa。
optionally, the volume of the karst cave in the core to be manufactured is determined according to the existing karst cave carbonate reservoir data and is obtained according to the following formula:
V′＝V×(1-Vm)
in the formula: v' is the volume of the karst cave in the rock core to be manufactured; v is the volume of the core to be manufactured; vmFor the core to be madeVolume of bedrock.
Optionally, the manufacturing material of the karst cave is sodium thiosulfate crystals.
Optionally, the embedding the karst cave model into the bedrock model to obtain the core to be manufactured specifically includes:
and embedding the karst cave model into the bedrock model, then pressing, demolding and taking out after molding, and removing the karst cave model material from the rock core by adopting a dissolving or evaporating means under the condition that the shape of the rock core is kept intact to form a karst cave so as to obtain the rock core to be manufactured.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
determining main factors influencing the physical properties of the bedrock according to the existing karst cave carbonate reservoir data, designing an experiment on the main factors influencing the physical properties of the bedrock, determining the composition of each component in a bedrock manufacturing material, and simultaneously obtaining a bedrock model of a rock core to be manufactured; determining the volume of a karst cave in a core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave type carbonate reservoir information, and manufacturing a karst cave model of the core to be manufactured; after obtaining the matrix rock model and the karst cave model, embedding the karst cave model into the matrix rock model to obtain a core to be manufactured, wherein the core to be manufactured is a karst cave type carbonate reservoir core, and the karst cave structure is contained in the core to be manufactured, so that an experiment carrier can be provided for researching the influence of the karst cave in the karst cave type carbonate reservoir on reservoir parameters.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a core manufacturing method according to an embodiment of the present disclosure;
fig. 2 is a flow chart of another core making method provided in an embodiment of the present disclosure;
fig. 3 is a physical property characteristic diagram of an actual reservoir matrix of an area to be researched in the core manufacturing method provided by the embodiment of the application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in further detail with reference to the accompanying drawings.
Since oil is stored in the pores of the rock formations, knowledge and knowledge of the reservoir in which the oil is located is required in order to recover the oil. And the core is an important medium for recognizing the reservoir.
At present, according to the needs of geological exploration work or engineering, a cylindrical rock sample taken out from a drilled borehole is a core by using an annular core drill and other coring tools.
Cores are typically produced by physical simulation to simulate the reservoir for observation. The experimental model adopted by the physical simulation is mainly a core model, the difficulty of on-site core drilling is high, the cost is high, the quantity is limited, and some special reservoirs are difficult to core and difficult to obtain natural underground cores, so that artificial cores are required to replace natural cores to perform the physical simulation experiment.
In the related art, a common artificial core manufacturing method is a quartz sand epoxy resin cementing manufacturing method, wherein a cementing agent is used for cementing quartz sand and epoxy resin, and then pressurization and heating are carried out to manufacture a core.
Then, the current artificial core manufacturing method aims at a conventional sandstone reservoir, the karst cave type carbonate reservoir is different from the conventional sandstone reservoir, the reservoir rock of the conventional artificial core manufacturing method contains a large number of karts with different sizes and shape characteristics, and the complex karst cave structures have direct influence on the physical and chemical properties of the rock, so that the artificial core aiming at the karst cave type carbonate reservoir needs to be manufactured in order to explore the karst cave type carbonate reservoir.
In order to explore the influence of karst caves in a karst cave type carbonate reservoir on reservoir parameters, an embodiment of the application provides a core manufacturing method, a flow chart of which is shown in fig. 1, and the method comprises the following steps:
And step 102, determining the composition of each component in the matrix making material according to main factors influencing the physical properties of the matrix, and obtaining a matrix model of the core to be made.
And 103, determining the volume of the karst cave in the core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave type carbonate reservoir data.
And 104, obtaining a karst cave model of the core to be manufactured according to the volume of the karst cave in the core to be manufactured and manufacturing materials of the karst cave.
And 105, embedding the karst cave model into the bedrock model to obtain the core to be manufactured.
The method provided by the embodiment of the application determines the main factors influencing the physical properties of the bedrock through the existing karst cave type carbonate reservoir data, then designs experiments on the main factors influencing the physical properties of the bedrock, determines the composition of each component in a bedrock manufacturing material, and simultaneously obtains a bedrock model of a core to be manufactured; determining the volume of a karst cave in a core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave type carbonate reservoir information, and manufacturing a karst cave model of the core to be manufactured; after obtaining the matrix rock model and the karst cave model, embedding the karst cave model into the matrix rock model to obtain a core to be manufactured, wherein the core to be manufactured is a karst cave type carbonate reservoir core, and the karst cave structure is contained in the core to be manufactured, so that an experiment carrier can be provided for researching the influence of the karst cave in the karst cave type carbonate reservoir on reservoir parameters.
After determining the main factors influencing the physical properties of the matrix according to the existing karst cave carbonate reservoir data, and before determining the components of the matrix manufacturing material according to the main factors influencing the physical properties of the matrix, the method further comprises the following steps:
and obtaining a bedrock manufacturing material.
Wherein, the bed rock preparation material includes:
rock sample particles and a cementing agent.
The rock sample particles are obtained from a local outcrop rock sample, and the region of the outcrop rock sample is the same as the region of the karst cave carbonate reservoir in the existing karst cave carbonate reservoir data.
Wherein, the cementing agent is epoxy resin AB glue.
The main factors influencing the physical properties of the bedrock comprise:
the grain size of the rock sample particles, the proportion of the dosage of the cementing agent to the dosage of the rock sample particles and the pressure of the compression molding of the rock core.
Wherein the particle size of the rock-like particles comprises:
40 meshes, 60 meshes, 80 meshes and 100 meshes.
Wherein, the proportion of the dosage of the cementing agent to the dosage of the rock sample particles comprises:
1:4，1:6，1:8、1:10。
wherein, the pressure of the core press forming comprises: 10MPa, 15MPa, 20MPa, 25MPa, 30 MPa.
Wherein, according to the existing karst cave carbonate reservoir data, the volume of the karst cave in the core to be manufactured is determined to be obtained according to the following formula:
V′＝V×(1-Vm)
in the formula: v' is the volume of a karst cave in the rock core to be manufactured; v is the volume of the core to be manufactured; vmIs the volume of the bedrock of the core to be made.
Wherein, the manufacturing material of the karst cave is sodium thiosulfate crystal.
The method comprises the following steps of embedding a karst cave model into a bedrock model to obtain a core to be manufactured, wherein the step of embedding the karst cave model into the bedrock model specifically comprises the following steps:
and embedding the karst cave model into the bedrock model, then pressing, demoulding and taking out after forming, and removing the karst cave model material from the rock core by adopting a dissolving or evaporating means under the condition that the shape of the rock core is kept intact to form the karst cave, thereby obtaining the rock core to be manufactured.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.
Fig. 2 is a flowchart of a core making method according to an embodiment of the present disclosure. The method comprises steps 201 to 206. The steps of the method are described in detail below:
Before the step, the existing karst cave carbonate reservoir data of the area to be researched needs to be obtained.
Optionally, the physical property characteristics of the bedrock in the karst cave type reservoir stratum of the area to be researched and the karst cave development condition can be counted according to the existing karst cave type carbonate reservoir stratum data.
Wherein, because the bedrock is mainly composed of rock particles, pores are distributed in the bedrock, and the bedrock can be stably formed under certain pressure pressing, thus the bedrock can be formed according to the existing karst cave type carbonate rock reservoir information.
The main factors that influence the physical properties of the bedrock can be determined as follows:
the grain size of the rock sample particles, the proportion of the dosage of the cementing agent to the dosage of the rock sample particles and the pressure of the compression molding of the rock core.
The physical properties of the bedrock include porosity and permeability.
The matrix making material can comprise rock sample particles and a cementing agent, and the rock sample particles can be bonded into an integral structure through the cementing agent.
Furthermore, in order to ensure that the properties of the prepared bedrock are the same as those of the bedrock in the existing karst cave type carbonate reservoir information, the rock sample particles are obtained from a local outcrop rock sample, and the region of the outcrop rock sample is the same as that of the karst cave type carbonate reservoir in the existing karst cave type carbonate reservoir information. After the outcrop rock sample is retrieved, the desired rock sample particles can be obtained by grinding.
For convenience of manufacture, the cementing agent can be epoxy AB glue.
And 203, determining the composition of each component in the matrix making material according to main factors influencing the physical properties of the matrix, and obtaining a matrix model of the core to be made.
After determining the main factors influencing the physical properties of the bedrock, a plurality of bedrock models need to be manufactured in a design experiment mode. And determining a matrix model which is most similar to the physical parameters of the actual karst cave type carbonate reservoir as the matrix model of the core to be manufactured after measuring and comparing the physical parameters of each matrix model with the physical parameters of the actual karst cave type carbonate reservoir, wherein the formation of the rock sample particles and the cementing agent corresponding to the matrix model is the formation of the rock sample particles and the cementing agent in the matrix manufacturing material.
In designing an experiment, a plurality of values may be set for each of the main factors that affect the physical properties of the bedrock.
Wherein the particle size of the rock-like particles may include:
40 meshes, 60 meshes, 80 meshes and 100 meshes.
For example, the rock-like particles may be 60 mesh in size.
The ratio of the amount of consolidating agent to the amount of rock sample particles may include: 1:4, 1:6, 1:8 and 1: 10.
The pressure for core compression molding may include:
10MPa、15MPa、20MPa、25MPa、30MPa。
for example, the pressure at which the core is press formed may be 15 MPa.
Of course, the grain size of the particles, the proportion of the amount of the cementing agent to the amount of the rock sample particles and the pressure of the core press forming can be more refined or more components can be added.
Further, when determining whether the value of one main factor influencing the physical property of the bedrock is the value of the component in the bedrock manufacturing material, the values of other main factors influencing the physical property of the bedrock can be set as fixed values, and a bedrock model is manufactured to perform physical property parameter testing.
Through a plurality of groups of design experiments, the following influence rules can be obtained:
along with the increase of the particle size mesh number of the rock sample particles, the values of the porosity and the permeability of the bedrock show a rule that the porosity and the permeability are increased and then reduced; along with the gradual reduction of the proportion of the usage of the cementing agent to the usage of the rock sample particles, the values of the porosity and the permeability of the bedrock show a rule of sharp increase; along with the gradual increase of the pressure of the core press forming, the values of the porosity and the permeability of the bedrock are reduced, and the reduction range of the permeability is larger.
Furthermore, multiple sets of design experiments also find that the value of the porosity of the artificial core is difficult to reduce when the core framework is manufactured by adopting single rock sample particles, so that after the proportion of the using amount of the cementing agent to the using amount of the rock sample particles is determined, glass beads with good roundness grinding and different particle sizes from the rock sample particles can be selected to be mixed with the rock sample particles to serve as a matrix material, so that the value of the porosity of the artificial core is effectively reduced.
Meanwhile, glass beads are mixed in the rock-like particles, so that the matrix manufacturing material also comprises the glass beads.
After the ratio of the rock sample particle usage to the glass bead usage is set, a plurality of matrix models are manufactured again, the physical property parameters of each matrix model are measured and compared with the physical property parameters of an actual karst cave type carbonate reservoir, one matrix model which is most similar to the physical property parameters of the actual karst cave type carbonate reservoir is determined as the matrix model of the core to be manufactured, and the usage of the rock sample particles, the cementing agent and the glass beads corresponding to the matrix model can be determined as the usage of the rock sample particles, the cementing agent and the glass beads in the matrix manufacturing material.
And 204, determining the volume of the karst cave in the core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave type carbonate reservoir data.
The volume of the karst cave to be made can be determined by simplifying the irregular karst cave into a regular geometric body with easily determined volume, such as a circle.
Next, the size of the cavern model is determined with reference to the cavern size classification standard.
Then, the volume of the karst cave in the core to be manufactured can be obtained according to the following formula:
V′＝V×(1-Vm)
in the formula: v' is the volume of a karst cave in the rock core to be manufactured; v is the volume of the core to be manufactured; vmIs the volume of the bedrock of the core to be made.
It should be noted that the core to be produced herein is a unit volume core to be produced.
In order to facilitate the formation of the karst cave in the bedrock model, the karst cave can be made of sodium thiosulfate crystals.
And step 205, obtaining a karst cave model of the core to be manufactured according to the volume of the karst cave in the core to be manufactured and manufacturing materials of the karst cave.
After the volume of the karst cave in the rock core to be manufactured and manufacturing materials of the karst cave are determined, a karst cave model with the preset karst cave volume can be manufactured by using the manufacturing materials of the karst cave.
And step 206, embedding the karst cave model into the bedrock model to obtain the core to be manufactured.
The method specifically comprises the steps of embedding a karst cave model into a bedrock model, then pressing, demoulding and taking out after forming, and removing karst cave model materials from a rock core by adopting a dissolving or evaporating means under the condition that the shape of the rock core is kept intact to form a karst cave so as to obtain the rock core to be manufactured.
Furthermore, the dissolving or evaporating means can be high-temperature baking, when the temperature is raised to 100 ℃, the sodium thiosulfate is vaporized, and a cavern is formed at the original place of the sodium thiosulfate.
The method provided by the embodiment of the application determines the main factors influencing the physical properties of the bedrock through the existing karst cave type carbonate reservoir data, then designs experiments on the main factors influencing the physical properties of the bedrock, determines the composition of each component in a bedrock manufacturing material, and simultaneously obtains a bedrock model of a core to be manufactured; determining the volume of a karst cave in a core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave type carbonate reservoir information, and manufacturing a karst cave model of the core to be manufactured; after obtaining the matrix rock model and the karst cave model, embedding the karst cave model into the matrix rock model to obtain a core to be manufactured, wherein the core to be manufactured is a karst cave type carbonate reservoir core, and the karst cave structure is contained in the core to be manufactured, so that an experiment carrier can be provided for researching the influence of the karst cave in the karst cave type carbonate reservoir on reservoir parameters.
The present application will be further described below by way of specific examples.
The embodiment provides a core manufacturing method, which is applied to a certain cavern type carbonate reservoir block in Sichuan basin, and the method specifically comprises the following steps:
according to the existing karst cave carbonate reservoir data, as shown in fig. 3, the main factors influencing the physical properties of the bedrock are determined for the actual reservoir bedrock physical property characteristic diagram of the area to be researched.
The main factors influencing the physical properties of the bedrock are as follows:
the grain size of the rock sample particles, the proportion of the dosage of the cementing agent to the dosage of the rock sample particles and the pressure of the compression molding of the rock core.
And collecting the outcrop rock sample of the target reservoir in the research area, and grinding and crushing the outcrop rock sample to be used as rock sample particles for later use.
And setting a plurality of values for each main factor influencing the physical property of the bedrock, and manufacturing a plurality of bedrock models for design experiments.
Wherein the grain diameters of the rock sample grains are set to be 40 meshes, 60 meshes, 80 meshes and 100 meshes;
the proportion of the dosage of the cementing agent to the dosage of the rock sample particles is 1:4, 1:6, 1:8 and 1: 10;
the pressure for pressing and forming the rock core is 10MPa, 15MPa, 20MPa, 25MPa and 30 MPa.
The physical property of an actual natural rock core is taken as a standard, the grain size of rock sample particles of a matrix rock model is determined to be 60 meshes, the ratio of the using amount of the cementing agent to the using amount of the rock sample particles is 1:6, and the pressure of the compression molding of the rock core is 20 MPa.
Further, in order to reduce the porosity of the bedrock model, glass beads with good roundness grinding and different particle sizes from the rock sample particles are selected to be mixed with the rock sample particles to serve as a bedrock material, and a plurality of bedrock models are manufactured again, wherein the ratio of the glass beads to the rock sample particles can be set to be 1:2, 1:1 and 2: 1.
And determining the ratio of the glass beads to the rock sample particles in the matrix rock model to be 1:1 by taking the physical properties of the actual natural rock core as a standard, and simultaneously obtaining the matrix rock model of the rock core to be manufactured.
Simplifying irregular karst caves in the rock core to be manufactured into a circle, determining the size of a karst cave model by referring to a karst cave size grading standard, and obtaining the volume of the karst caves in the rock core to be manufactured per unit volume according to the following formula:
V′＝V×(1-Vm)
in the formula: v' is the volume of a karst cave in the rock core to be manufactured; v is the volume of the core to be manufactured; vmIs the volume of the bedrock of the core to be made.
And (4) manufacturing a karst cave model by using the sodium thiosulfate crystals to obtain the karst cave model of the core to be manufactured.
And embedding the karst cave model into a bedrock model for pressing, demolding and taking out after molding, and removing the sodium thiosulfate crystals from the rock core by adopting a high-temperature baking means under the condition that the rock core shape is kept intact to form the karst cave so as to obtain the rock core to be manufactured.
The core to be manufactured is a karst cave type carbonate reservoir core, the karst cave structure is contained in the core, and an experiment carrier can be provided for researching the influence of the karst cave in the karst cave type carbonate reservoir on reservoir parameters.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (12)
1. A method of making a core, the method comprising:
determining main factors influencing the physical properties of bedrocks according to the existing karst cave carbonate reservoir data;
determining the composition of each component in the matrix making material according to the main factors influencing the physical properties of the matrix, and obtaining a matrix model of the core to be made;
determining the volume of a karst cave in a rock core to be manufactured and manufacturing materials of the karst cave according to the existing karst cave carbonate reservoir data;
obtaining a karst cave model of the core to be manufactured according to the volume of the karst cave in the core to be manufactured and manufacturing materials of the karst cave;
and embedding the karst cave model into the bedrock model to obtain the core to be manufactured.
2. The method for manufacturing the core according to claim 1, wherein after determining the main factors influencing the physical properties of the matrix rock according to the existing cavern type carbonate reservoir data, before determining the components of the matrix rock manufacturing material according to the main factors influencing the physical properties of the matrix rock, the method further comprises:
and obtaining a bedrock manufacturing material.
3. The core making method as claimed in claim 2, wherein the matrix making material comprises:
rock sample particles and a cementing agent.
4. The core-making method as claimed in claim 3, wherein the rock sample particles are obtained from a field outcrop rock sample;
and the region where the outcrop rock sample is located and the region where the karst cave carbonate reservoir is located in the existing karst cave carbonate reservoir data are the same region.
5. The method for making a core according to claim 3, wherein the cementing agent is an epoxy AB glue.
6. The core making method as claimed in claim 2, wherein the main factors affecting the physical properties of the matrix include:
the grain size of the rock sample particles, the proportion of the dosage of the cementing agent to the dosage of the rock sample particles and the pressure of the compression molding of the rock core.
7. The core making method as claimed in claim 6, wherein the particle size of the rock-like particles comprises:
40 meshes, 60 meshes, 80 meshes and 100 meshes.
8. The core making method as claimed in claim 6, wherein the ratio of the amount of the cementing agent to the amount of the rock sample particles comprises:
1:4，1:6，1:8、1:10。
9. the method as recited in claim 6, wherein the pressure at which the core is compression molded comprises:
10MPa、15MPa、20MPa、25MPa、30MPa。
10. the method for manufacturing the core according to any one of claims 1 to 9, wherein the determination of the volume of the cavern in the core to be manufactured according to the existing cavern type carbonate reservoir data is obtained according to the following formula:
V′＝V×(1-Vm)
in the formula: v' is the volume of the karst cave in the rock core to be manufactured; v is the volume of the core to be manufactured; vmTo be made intoThe matrix volume of the core.
11. The core making method as claimed in any one of claims 1 to 10, wherein the material for making the caverns is sodium thiosulfate crystals.
12. The core production method according to any one of claims 1 to 11, wherein the embedding of the karst cave model into the bedrock model to obtain the core to be produced specifically comprises:
and embedding the karst cave model into the bedrock model, then pressing, demolding and taking out after molding, and removing the karst cave model material from the rock core by adopting a dissolving or evaporating means under the condition that the shape of the rock core is kept intact to form a karst cave so as to obtain the rock core to be manufactured.
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| CN114993785A (en) * | 2022-05-30 | 2022-09-02 | 西安石油大学 | Preparation method of pore crack type carbonate rock artificial core |
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