CN111060366A - Artificial core manufacturing method for simulating borehole drilling - Google Patents
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- CN111060366A CN111060366A CN201911286505.8A CN201911286505A CN111060366A CN 111060366 A CN111060366 A CN 111060366A CN 201911286505 A CN201911286505 A CN 201911286505A CN 111060366 A CN111060366 A CN 111060366A
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- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G—PHYSICS
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- 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
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Abstract
The invention discloses a method for manufacturing an artificial core for simulating borehole drilling, which comprises the following steps: 1) manufacturing a borehole paraffin blank; 2) manufacturing an artificial core blank comprising mixed slurry and the borehole drilling paraffin blank manufactured in the step 1), wherein the mixed slurry comprises quartz sand, cement, clay and water; 3) heating the artificial core blank prepared in the step 2) to obtain the artificial core simulating borehole drilling. The artificial core manufactured by the invention is similar to a natural core in physical properties such as permeability, porosity and the like, and perforation measures in an oil extraction process are simulated; the artificial core manufactured by the invention can be used for researching the damage transformation rule of oil extraction measures such as perforation fracturing and the like on the stratum and carrying out related indoor simulation experiments, and the whole manufacturing method is simple and safe, raw materials are economical and easy to obtain, and the problems of limited experiment analysis such as difficult acquisition of natural cores, unstable physical properties, complexity and large anisotropy difference of rocks are avoided.
Description
Technical Field
The invention relates to the technical field of artificial core manufacturing. And more particularly, to a method of making an artificial core that simulates a borehole.
Background
At present, the domestic petroleum resource exploitation is seriously insufficient, most of oil and gas fields discovered subsequently are low-permeability and ultra-low-permeability oil reservoirs, and stratum rocks are hard, so that the high-energy physical perforation oil extraction method technology is widely applied. However, the use of this technique is limited due to the difficulty and expense of obtaining natural cores.
In the experiment of simulating rock impact at different loading rates in a laboratory, the commonly adopted artificial rock core is mainly prepared by mixing quartz sand or river sand and cement according to a certain mass ratio, adding a certain amount of water, stirring and solidifying. The artificial core manufactured by the method can meet a single displacement experiment, and can effectively simulate a natural core in the aspects of physical properties such as porosity, permeability, compressive strength and the like. However, for laboratory experimental simulated field studies of high energy physical perforation oil extraction techniques, due to the complexity and irregularity of formation rock physical properties, the simulation studies require cores with simulated wellbores and perforations, which cannot be met by commonly used artificial cores. The existing solution is to preset a steel pipe with a certain diameter in the core pressing process, but the method limits the influence of fluid on a perforation channel, is different from the actual mine field situation to a great extent, and inevitably cannot really explore the dynamic response rule of the rock after the process action.
Accordingly, the present invention provides a method of making an artificial core that simulates borehole drilling to solve the above problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for manufacturing an artificial core for simulating borehole drilling; the manufacturing method overcomes the limitation of the existing artificial rock core technology, the manufactured artificial rock core is similar to a natural rock core in physical properties such as permeability, porosity and the like, perforation measures in an oil extraction process are simulated, the manufactured rock core can be used for researching the damage transformation rule of the oil extraction measures such as perforation fracturing and the like on the stratum, and relevant indoor simulation experiments are carried out.
The purpose of the invention is realized by the following technical scheme:
a method for manufacturing an artificial core for simulating borehole drilling comprises the following steps:
1) manufacturing a borehole paraffin blank;
2) manufacturing an artificial core blank comprising mixed slurry and the borehole drilling paraffin blank manufactured in the step 1), wherein the mixed slurry comprises quartz sand, cement, clay and water;
3) heating the artificial core blank prepared in the step 2) to obtain the artificial core simulating borehole drilling.
The method for manufacturing the artificial core simulating borehole drilling comprises the steps of preparing a blank for simulating the borehole and drilling by using paraffin, pressing and solidifying the blank for simulating the borehole and drilling into mixed slurry of quartz sand, cement and clay, and heating to melt the paraffin and stabilize the properties of the core so as to form the pressed artificial core with the borehole and drilling; the whole preparation method is simple and safe, and the raw materials are economical and easy to obtain.
Preferably, the process of manufacturing the paraffin blank for borehole drilling in the step 1) specifically includes the following steps:
heating and melting paraffin, placing the molten paraffin in a borehole drilling mould, cooling and forming, removing the borehole drilling mould, and obtaining a borehole drilling paraffin blank.
Preferably, the paraffin wax in step 1) is fischer-tropsch paraffin wax or polyethylene paraffin wax; the melting point of the Fischer-Tropsch wax is 98 ℃, and the melting point of the polyethylene paraffin is 105 ℃.
Preferably, the heating temperature of the heating molten paraffin in the step 1) is 110-.
Preferably, the device for heating the paraffin in the step 1) is a dryer, and the heating temperature range of the dryer is 0-500 ℃.
Preferably, the cooling molding in the step 1) is naturally cooled for 24-36 h.
Preferably, the wellbore drilling paraffin blank prepared in step 1) comprises a cylindrical main body and a plurality of cylindrical support arms which are distributed in a staggered manner and integrally extend out of the side wall of the cylindrical main body.
Preferably, the diameter of the cylindrical main body is 6-10mm, the diameter of the cylindrical support arm is 2-3mm, and the length of the cylindrical support arm is 15-20 mm.
Preferably, the process for manufacturing the artificial core blank comprising the mixed slurry and the borehole paraffin blank manufactured in the step 1) in the step 2) specifically comprises the following steps:
placing the borehole paraffin blank prepared in the step 1) in a sample bin of a pressing device, pouring mixed slurry into the sample bin of the pressing device when the borehole paraffin blank needs to be vertically erected at a central shaft, pressing and curing to obtain an artificial core blank.
Preferably, the inner wall of the pressing device is coated with a lubricating oil.
Preferably, the lubricating oil is GB11121-95 lubricating oil or GB1269-90 lubricating oil or GB5903-95 lubricating oil and other commercially available lubricating oil.
Preferably, the mass ratio of the quartz sand, the cement, the clay and the water in the mixed slurry in the step 2) is 1 (0.5-2): 0.01-0.025): 0.1-0.2.
Preferably, the preparation of the mixed slurry in the step 2) comprises the following steps: mixing and stirring quartz sand, cement and clay to obtain a mixture A; and mixing and stirring the mixture A and water to obtain mixed slurry.
Preferably, the mesh number of the quartz sand in the step 2) is 20-80 meshes.
Preferably, the cement in step 2) is composite portland cement or composite cement or ordinary cement.
Preferably, the heating manner in step 3) is step stable temperature heating, and the specific temperature and time are as follows: firstly heating to 55-65 ℃ for 4h, then heating to 95-105 ℃ for 4h, then heating to 140-150 ℃ for 4h, continuing heating to 190-200 ℃ for 4h, and finally heating to 290-300 ℃ for 4 h.
Preferably, after the artificial core blank is heated in step 3), the method further comprises the following steps: and (3) soaking the heated artificial rock core blank in kerosene in a vacuum container, taking out and washing oil.
Preferably, the pressure difference of the vacuum container is 0.7-0.9 MPa.
Preferably, the soaking time is 3-4 days.
Preferably, the wash oil is performed in an oil wash apparatus.
Preferably, the agent used for washing the oil is a mixture of toluene and ethanol in a ratio of 3:1 or a mixture of benzene and ethanol in a ratio of 3:1, and the oil washing time is 4-5 days.
Preferably, the artificial core prepared in the step 3) is a cylinder comprising an inner cavity, and the shape of the inner cavity of the artificial core is matched with that of a paraffin embryo body of borehole drilling; the height of the artificial core is 40-60 mm, and the outer diameter of the artificial core is 50-80 mm.
The invention also provides an artificial core prepared by the artificial core manufacturing method for simulating borehole drilling.
In addition, unless otherwise specified, any range recited herein includes any value between the endpoints and any sub-range defined by any value between the endpoints or any value between the endpoints.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the method for manufacturing the artificial core for simulating the borehole drilling realizes that the paraffin with high hardness and high melting point is used for manufacturing the mould for simulating the borehole and the drilling, and then the paraffin mould is pressed and solidified into the mixture of quartz sand, cement and clay to form the pressed artificial core with the borehole and the drilling.
2. The artificial rock core manufactured by the invention is similar to a natural rock core in physical properties such as permeability, porosity and the like, the rock sample is perforated by using the perforating device, and the perforating measure in the oil extraction process is simulated, so that the artificial rock core is more suitable for the situation in a real stratum.
3. The artificial core manufactured by the invention can be used for researching the damage transformation rule of oil extraction measures such as perforation fracturing and the like on the stratum and carrying out related indoor simulation experiments, and the whole manufacturing method is simple and safe, raw materials are economical and easy to obtain, and the problems of limited experiment analysis such as difficult acquisition of natural cores, unstable physical properties, complexity and large anisotropy difference of rocks are avoided.
4. The invention provides the required core with the simulated well hole and the perforation for simulating the high-energy physical perforation oil production method technology, and provides the conditions of the simulation experiment for researching the dynamic response rule of the rock after the process action.
Drawings
FIG. 1 shows a flow chart for making an artificial core for simulating borehole drilling provided by the present invention.
Fig. 2 shows a schematic structural view of an artificial core for simulating borehole drilling provided by the present invention.
Fig. 3 is a graph showing the time-dependent peak pressure of a rock impact damage simulation experiment performed on an artificial core obtained in example 1 of the present invention.
Fig. 4 is a graph showing the time-dependent peak pressure of a rock impact damage simulation experiment performed on an artificial core prepared in example 2 of the present invention.
Fig. 5 shows a schematic overall cross-sectional view of a wellbore drilling mold provided by the present invention.
FIG. 6 shows a schematic diagram of a structure of a perforation hole of a borehole drilling mold provided by the invention.
Reference numerals: 1-upper end screw cap, 2-main body cylinder, 3-support arm, 4-lower end screw cap, 5-connecting thread, 6-support arm cylinder and 7-support arm end cap.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for manufacturing an artificial core for simulating borehole drilling, which has a flow shown in figure 1 and specifically comprises the following steps:
1) manufacturing a borehole paraffin blank;
2) manufacturing an artificial core blank comprising mixed slurry and the borehole drilling paraffin blank manufactured in the step 1), wherein the mixed slurry comprises quartz sand, cement, clay and water;
3) heating the artificial core blank prepared in the step 2) to obtain the artificial core simulating borehole drilling.
As a preferred embodiment of the present invention, the process for making the paraffin blank for borehole drilling in step 1) specifically includes the following steps: heating and melting paraffin, placing the molten paraffin in a borehole drilling mould, cooling and forming, removing the borehole drilling mould, and obtaining a borehole drilling paraffin blank. The liquid paraffin is filled into the borehole drilling mould, and the paraffin blank with the borehole drilling shape is obtained through cooling and solidification.
Referring to fig. 5 and 6, the borehole drilling mold mainly comprises an upper end screw cap, a lower end screw cap 4, a main cylindrical barrel 2 and a support arm 3, and can be divided into two sections along the axis, when the mold is used, the two sections are firstly connected together by the lower end screw cap 4, the support arm sealed by the end cap is connected to the main cylindrical barrel 2 by threads, then liquid paraffin is poured into the main cylindrical barrel 2, the upper end screw cap 1 is screwed up and vertically placed, when the mold is removed after cooling, the upper end screw cap and the lower end screw cap are firstly rotationally dismounted, then the support arm is slowly and anticlockwise rotationally dismounted, and finally the main cylindrical barrel is slowly separated. The support arm 3 is composed of a support arm cylinder 6, a support arm end cap 7 and a connecting thread 5.
As a preferred embodiment of the present invention, the paraffin wax in step 1) is fischer-tropsch paraffin wax or polyethylene paraffin wax; the melting point of the Fischer-Tropsch paraffin is 98 ℃, and the melting point of the polyethylene paraffin is 105 ℃; the Fischer-Tropsch wax has the characteristics of high hardness and high melting point, and is not easy to deform when being pressed subsequently.
As a preferred embodiment of the present invention, the heating temperature of the heating molten paraffin in the step 1) is 110-120 ℃; the heating temperature is higher than the melting point of the paraffin wax, so that the paraffin wax is melted.
As a preferred embodiment of the present invention, the device for heating the paraffin in step 1) is a dryer, and the heating temperature range of the dryer is 0 to 500 ℃.
As a preferred embodiment of the invention, the cooling molding in the step 1) is natural cooling for 24-36 h. This cooling time ensures complete solidification and stable properties of the paraffin with subsequent stripping.
As a preferred embodiment of the present invention, the wellbore drilling paraffin blank prepared in step 1) comprises a cylindrical main body and a plurality of cylindrical arms integrally extending from the side wall of the cylindrical main body. And drilling a paraffin blank through the borehole with the shape to obtain the artificial core with the inner cavity with the same shape as the paraffin blank, so that the inner cavity of the artificial core is provided with the borehole and the drilled hole. Furthermore, the diameter of the cylindrical main body is 6-10mm, the diameter of the cylindrical support arm is 2-3mm, and the length of the cylindrical support arm is 15-20 mm.
As a preferred embodiment of the present invention, the process for preparing the artificial core blank comprising the mixed slurry and the borehole paraffin blank prepared in step 1) in step 2) specifically comprises the following steps: placing the borehole paraffin blank prepared in the step 1) into an inner cavity of a pressing device, pouring mixed slurry into the inner cavity of the pressing device, pressing and curing to obtain the artificial core blank. To obtain a synthetic core having a wellbore bore, a slurry is mixed during this step to encapsulate a wellbore bore paraffin blank to form a synthetic core blank.
As a preferred embodiment of the invention, the inner wall of the pressing device is coated with a lubricating oil. The direct adhesion of rock specimen mixture material and sample storehouse mould can be separated to lubricating oil, and then is favorable to the drawing of patterns. Furthermore, the lubricating oil is GB11121-95 model lubricating oil or GB1269-90 lubricating oil or GB5903-95 lubricating oil and other commercially available lubricating oil. The lubricating oil has good packing effect and low price, and is easy to purchase.
As a preferred embodiment of the present invention, the mass ratio of the quartz sand, the cement, the clay and the water in the mixed slurry in the step 2) is 1:2:0.025: 0.2.
As a preferred embodiment of the present invention, the preparation of the mixed slurry in step 2) comprises the steps of: mixing and stirring quartz sand, cement and clay to obtain a mixture A; and mixing and stirring the mixture A and water to obtain mixed slurry.
As a preferred embodiment of the present invention, the mesh number of the silica sand in the step 2) is 20 to 80 mesh.
As a preferred embodiment of the invention, the cement in the step 2) is composite portland cement or composite cement or ordinary cement, and the strength of the cement is similar to that of natural rock, and the cement is cheap and easy to purchase.
As a preferred embodiment of the present invention, the heating manner in step 3) is step stable temperature heating, and the specific temperature and time are as follows: firstly heating to 55-65 ℃ for 4h, then heating to 95-105 ℃ for 4h, then heating to 140-150 ℃ for 4h, continuing heating to 190-200 ℃ for 4h, and finally heating to 290-300 ℃ for 4 h. The step heating mode not only removes paraffin in the artificial rock core blank, but also makes the artificial rock core more stable in performance.
As a preferred embodiment of the present invention, after the artificial core blank is heated in step 3), the method further comprises the following steps: and (3) soaking the heated artificial rock core blank in kerosene in a vacuum container, taking out and washing oil. This step allows the impurities generated during the manufacturing process to be dissolved into the kerosene.
In a preferred embodiment of the present invention, the pressure difference of the evacuation vessel is 0.7 to 0.9 MPa. It will be advantageous for the kerosene to enter the pores of the rock sample, dissolving as much as possible all the impurities.
As a preferred embodiment of the present invention, the soaking time is 3 to 4 days. So that the kerosene can be used for dissolving impurities in sufficient time.
As a preferred embodiment of the invention, the oil washing is carried out in an oil washer.
In a preferred embodiment of the present invention, the agent used for washing the oil is toluene, and the washing time is 4 to 5 days. So that the coal oil and impurities in the rock sample can be washed out after enough time.
The invention also provides an artificial core prepared by the artificial core manufacturing method for simulating borehole drilling.
As a preferred embodiment of the invention, the artificial core simulating borehole drilling is a cylinder comprising an inner cavity, and the shape of the inner cavity of the artificial core simulating borehole drilling is matched with the shape of the paraffin embryo of the borehole drilling; the height of the artificial core for simulating borehole drilling is 40-60 mm, and the outer diameter is 50-80 mm; a schematic of the structure of the synthetic core simulating borehole drilling is shown in fig. 2.
The present invention will be further described with reference to the following examples.
Example 1
This embodiment 1 provides a method for manufacturing an artificial core for simulating borehole drilling, including the following steps:
1) heating Fischer-Tropsch wax to 110 ℃ by using a dryer to melt the Fischer-Tropsch wax into liquid, placing the melted Fischer-Tropsch wax into a borehole drilling mould, naturally cooling for 24 hours for forming, and removing the borehole drilling mould to obtain a borehole drilling paraffin wax blank; the paraffin blank for borehole drilling comprises a cylindrical main body and three cylindrical support arms which integrally extend from the side wall of the cylindrical main body and are distributed in a staggered manner; the diameter of the cylindrical main body is 8mm, the diameter of the cylindrical support arm is 3mm, and the length of the cylindrical support arm is 17 mm;
2) mixing and stirring 500g of quartz sand of 40 meshes, 500g of composite portland cement and 12.5g of clay to obtain a mixture A; mixing and stirring the mixture A and water to obtain mixed slurry; wherein the mass ratio of the quartz sand to the cement to the clay to the water is 1:1:0.025: 0.2;
placing the borehole paraffin blank prepared in the step 1) in an inner cavity of a pressing device coated with lubricating oil of GB11121-95 model on the inner wall, pouring mixed slurry into the inner cavity of the pressing device, pressing and curing to obtain an artificial core blank;
3) carrying out step stable temperature heating on the artificial core blank prepared in the step 2), wherein the specific temperature and time are as follows: heating to 60 ℃ for 4h, then heating to 100 ℃ for 4h, then heating to 140 ℃ for 4h, continuing heating to 200 ℃ for 4h, and finally heating to 300 ℃ for 4 h;
placing the heated artificial core blank in kerosene in a vacuum-pumping container with the pressure difference of 0.9Mpa for soaking for 3 days, taking out and placing in an oil washing instrument for washing oil with toluene for 5 days to obtain an artificial core simulating borehole drilling, wherein the artificial core is a cylinder comprising an inner cavity, and the shape of the inner cavity of the artificial core is matched with that of the paraffin blank of the borehole drilling; the height of the artificial core is 50mm, and the outer diameter of the artificial core is 80 mm; the physical properties are shown in Table 1.
The artificial core for simulating borehole drilling prepared in example 1 was subjected to rock impact damage simulation experiment, and the peak pressure thereof was varied with time as shown in fig. 3.
TABLE 1 core static physical Properties Table
Example 2
This embodiment 2 provides an artificial core manufacturing method for simulating borehole drilling, including the following steps:
1) heating Fischer-Tropsch wax to 110 ℃ by using a dryer to melt the Fischer-Tropsch wax into liquid, placing the melted Fischer-Tropsch wax into a borehole drilling mould, naturally cooling for 24 hours for forming, and removing the borehole drilling mould to obtain a borehole drilling paraffin wax blank; the paraffin blank for borehole drilling comprises a cylindrical main body and three cylindrical support arms which integrally extend from the side wall of the cylindrical main body and are distributed in a staggered manner; the diameter of the cylindrical main body is 10mm, the diameter of the cylindrical support arm is 3mm, and the length of the cylindrical support arm is 20 mm;
2) mixing and stirring 400g of quartz sand of 60 meshes, 800g of composite portland cement and 10g of clay to obtain a mixture A; mixing and stirring the mixture A and water to obtain mixed slurry; wherein the mass ratio of the quartz sand to the cement to the clay to the water is 1:2:0.025: 0.2;
placing the borehole paraffin blank prepared in the step 1) in an inner cavity of a pressing device coated with lubricating oil of GB11121-95 model on the inner wall, pouring mixed slurry into the inner cavity of the pressing device, pressing and curing to obtain an artificial core blank;
3) carrying out step stable temperature heating on the artificial core blank prepared in the step 2), wherein the specific temperature and time are as follows: heating to 60 ℃ for 4h, then heating to 100 ℃ for 4h, then heating to 140 ℃ for 4h, continuing heating to 200 ℃ for 4h, and finally heating to 300 ℃ for 4 h;
placing the heated artificial core blank in kerosene in a vacuumizing container with the pressure difference of 1Mpa for soaking for 3 days, taking out the artificial core blank and placing the artificial core blank in an oil washing instrument for washing oil by using toluene for 5 days to obtain an artificial core simulating borehole drilling, wherein the artificial core is a cylinder comprising an inner cavity, and the shape of the inner cavity of the artificial core is matched with the shape of a paraffin blank of the borehole drilling; the height of the artificial core is 50mm, and the outer diameter of the artificial core is 80 mm; the physical properties are shown in Table 2.
The artificial core for simulating borehole drilling prepared in example 2 was subjected to rock impact damage simulation experiment, and the peak pressure thereof was shown in fig. 4 with time.
TABLE 2 core static physical Properties Table
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for manufacturing an artificial core for simulating borehole drilling is characterized by comprising the following steps:
1) manufacturing a borehole paraffin blank;
2) manufacturing an artificial core blank comprising mixed slurry and the borehole drilling paraffin blank manufactured in the step 1), wherein the mixed slurry comprises quartz sand, cement, clay and water;
3) heating the artificial core blank prepared in the step 2) to obtain the artificial core simulating borehole drilling.
2. The method for manufacturing the artificial core for simulating borehole drilling according to claim 1, wherein the step 1) specifically comprises the following steps:
heating and melting paraffin, placing the molten paraffin in a borehole drilling mould, cooling and forming, removing the borehole drilling mould, and obtaining a borehole drilling paraffin blank.
3. The method for manufacturing the artificial core for simulating borehole drilling according to claim 1 or 2, wherein the paraffin wax in step 1) is Fischer-Tropsch paraffin wax or polyethylene paraffin wax.
4. The method for manufacturing the artificial core for simulating borehole drilling according to claim 1 or 2, wherein the borehole drilling paraffin blank manufactured in the step 1) comprises a cylindrical main body and cylindrical support arms which are integrally extended from the side wall of the cylindrical main body and are distributed in a staggered mode.
5. The method for manufacturing the artificial core for simulating borehole drilling according to claim 1, wherein the step 2) comprises the following steps:
placing the borehole paraffin blank prepared in the step 1) in a sample bin of a pressing device, wherein the borehole paraffin blank needs to be vertically erected at a central shaft during placement, pouring mixed slurry into the sample bin of the pressing device, and pressing and curing to obtain an artificial core blank.
6. The method for making an artificial core for simulating borehole drilling according to claim 1 or 5, wherein the mass ratio of the quartz sand, the cement, the clay and the water in the mixed slurry in the step 2) is 1 (0.5-2): 0.01-0.025): 0.1-0.2.
7. The method for manufacturing an artificial core for simulating borehole drilling according to claim 1 or 5, wherein the preparation of the mixed slurry in step 2) comprises the following steps: mixing and stirring quartz sand, cement and clay to obtain a mixture A; and mixing and stirring the mixture A and water to obtain mixed slurry.
8. The method for manufacturing the artificial core for simulating borehole drilling according to claim 1, wherein the heating in step 3) is performed in a manner that: firstly heating to 55-65 ℃ for 4h, then heating to 95-105 ℃ for 4h, then heating to 140-150 ℃ for 4h, continuing heating to 190-200 ℃ for 4h, and finally heating to 290-300 ℃ for 4 h.
9. The method for manufacturing the artificial core for simulating borehole drilling according to claim 1, wherein the artificial core manufactured in the step 3) is a cylinder comprising an inner cavity, and the shape of the inner cavity of the artificial core is matched with the shape of a paraffin embryo of the borehole drilling; the height of the artificial core is 40-60 mm, and the outer diameter of the artificial core is 50-80 mm.
10. An artificial core for simulating borehole drilling, characterized in that the artificial core for simulating borehole drilling is prepared by the method for preparing the artificial core for simulating borehole drilling according to any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112539050A (en) * | 2021-01-21 | 2021-03-23 | 东北石油大学 | Combined 3D spiral perforation simulated injection device and simulation method |
| CN113447328A (en) * | 2021-06-17 | 2021-09-28 | 河海大学 | Preparation device and preparation method of broken stone core composite sample for large triaxial test |
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| CN113447328B (en) * | 2021-06-17 | 2022-08-05 | 河海大学 | Preparation device and preparation method of broken stone core composite sample for large triaxial test |
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Application publication date: 20200424 |