CN115614032A - Low-permeability reservoir pressure flooding fracture spread form testing device and method - Google Patents
Low-permeability reservoir pressure flooding fracture spread form testing device and method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention discloses a low-permeability reservoir pressure drive crack spreading form testing device which comprises a displacement pump, an intermediate container, a core holder and a waste liquid recovery container, wherein one end of the intermediate container is connected with the displacement pump through a liquid inlet pipeline, the other end of the intermediate container is connected with one end of the core holder through a liquid outlet pipeline, the other end of the core holder is connected with the waste liquid recovery container through a waste liquid pipeline, a reservoir pressure drive model is arranged in the core holder, the core holder is connected with a manual pump through an injection pipeline, a first control valve is arranged on the liquid inlet pipeline, a second control valve and an inlet pressure gauge are arranged on the liquid outlet pipeline, and a third control valve, an outlet pressure gauge and a liquid flow meter are arranged on the waste liquid pipeline. The invention also discloses a method for testing the low-permeability reservoir pressure-flooding fracture spread form, which is characterized in that a 3D printer is adopted to manufacture a reservoir pressure-flooding model containing fractures, a testing device is utilized to carry out water flooding experiments on the reservoir pressure-flooding model, the fracture spread form before and after pressure flooding is obtained, and a basis is provided for guiding pressure flooding development.
Description
Technical Field
The invention relates to the technical field of low-permeability reservoir development, in particular to a device and a method for testing the pressure flooding fracture spread form of a low-permeability reservoir.
Background
Aiming at the current situations that water cannot be injected into a water injection well of a low-permeability oil reservoir and oil cannot be produced from an oil production well, a series of high-pressure water injection pilot tests are developed in oil fields such as Daqing oil fields and Tuhai oil fields, and a certain development effect is achieved. According to field practice, a pressure flooding technology is provided for a victory oil field, hydraulic fracturing equipment is combined with water injection development, high-pressure water injection equipment with large displacement is matched, and short-term high-pressure water injection is carried out at the pressure higher than the formation fracture pressure, so that rocks around a shaft are fractured to form cracks, the oil reservoir pressure is increased in a short time, the seepage capability is improved, and the oil well productivity and the oil reservoir recovery rate are increased.
Based on the knowledge of field practice, the fact that a large number of cracks are generated on reservoir rock around an injection well in the pressure flooding process can be inferred, however, in the field construction of an oil field, the fact that the change of the internal structure of the reservoir is directly obtained is extremely difficult, and the spreading form of the pressure flooding cracks is not known clearly. Therefore, it is urgently needed to provide a device and a method for testing the fracture spread form of the low-permeability reservoir pressure flooding in order to obtain the fracture spread form in the water injection process of the low-permeability core pressure flooding and research the extension and the expansion of the fracture in the water injection process of the low-permeability core pressure flooding.
Disclosure of Invention
The invention aims to solve the problems and provides a device and a method for testing the fracture spread form of the low-permeability reservoir pressure flooding, so that the real simulation of the generation process of the internal fractures of the reservoir during the field pressure flooding construction of the oil field is realized, the research on the fracture change of the internal strata before and after the pressure flooding is facilitated, and a basis is provided for guiding the pressure flooding development.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low permeability reservoir pressure flooding crack spreading form testing device comprises a displacement pump, an intermediate container, a core holder and a waste liquid recovery container;
the output end of the displacement pump is connected with the input end of the intermediate container through a liquid inlet pipeline, the output end of the intermediate container is connected with one end of the core holder through a liquid outlet pipeline, the other end of the core holder is connected with a waste liquid recovery container through a waste liquid pipeline, and a liquid flowmeter is arranged on the waste liquid pipeline;
the oil reservoir pressure drive model is fixed inside the core holder, and a manual pump is arranged on the core holder and connected with the core holder through an injection pipeline.
Preferably, an inlet pressure gauge is arranged on one side, close to the core holder, of the liquid outlet pipeline, an outlet pressure gauge is arranged on one side, close to the core holder, of the waste liquid pipeline, and a confining pressure gauge is arranged on the injection pipeline.
Preferably, a first control valve is arranged on the liquid inlet pipeline, a second control valve is arranged on one side, close to the middle container, of the liquid outlet pipeline, a third control valve is arranged on the waste liquid pipeline, and the third control valve is located between the rock core holder and the liquid flowmeter.
A low permeability reservoir pressure drive fracture spread form test method adopts the low permeability reservoir pressure drive fracture spread form test device, and specifically comprises the following steps:
step 1, manufacturing an oil reservoir pressure flooding model containing cracks based on a 3D printing method;
step 2, obtaining formation water in an actual reservoir, injecting the formation water into an intermediate container, and then placing an oil reservoir pressure drive model containing fractures in a core holder, wherein the first control valve, the second control valve and the third control valve are all in a closed state;
step 3, setting an initial confining pressure value and an initial flow rate, controlling a manual pump to apply confining pressure to an oil reservoir pressure drive model in the core holder, opening a first valve, a second valve, a third valve and a displacement pump after the confining pressure value borne by the oil reservoir pressure drive model is increased to the initial confining pressure value, setting the flow rate of the displacement pump as the initial flow rate, then performing water drive, recording readings of an inlet pressure gauge, an outlet pressure gauge and a liquid flowmeter, and combining the sectional area of the oil reservoir pressure drive model to obtain the initial permeability of the oil reservoir pressure drive model;
step 4, when the readings of the liquid flow meter are consistent with the flow rate of the displacement pump, the oil reservoir pressure drive model reaches a stable state, the confining pressure value borne by the oil reservoir pressure drive model is kept unchanged, the flow rate of the displacement pump is changed to continue water drive on the oil reservoir pressure drive model, the readings of an inlet pressure gauge, an outlet pressure gauge and the liquid flow meter are recorded, the sectional area of the oil reservoir pressure drive model is combined, the permeability of the oil reservoir pressure drive model is obtained in real time, and the first valve, the second valve, the third valve and the displacement pump are closed until the permeability of the oil reservoir pressure drive model is five times of the initial permeability;
and 5, taking the oil reservoir pressure flooding model out of the rock core holder, carrying out nuclear magnetic resonance test on the oil reservoir pressure flooding model by using a nuclear magnetic resonance instrument, obtaining the distribution rule of fluid after pressure flooding in each pore of the oil reservoir pressure flooding model, and determining the extension length and the width of the crack in the oil reservoir pressure flooding model before and after pressure flooding.
Preferably, the step 1 comprises the following sub-steps:
1.1, constructing a three-dimensional core model by using three-dimensional drawing software, wherein the three-dimensional core model is constructed and used for simulating a reservoir where a water injection well is located, a simulation well mouth used for simulating a well mouth of the water injection well is arranged in the center of the three-dimensional core model, and a plurality of cracks are arranged at the bottom of the simulation well mouth and used for simulating cracks around the water injection well;
step 1.2, filling resin sand into a material cylinder of a 3D printer, cleaning a magnetic guide rail of the 3D printer by using a dust collector, setting scanning track parameters and generating tracks, and controlling a powder spreading device of the 3D printer to spread powder according to the generated tracks so that the sand surface of the material cylinder and a molding cylinder of the 3D printer is flat;
step 1.3, setting the temperature of the 3D printer, starting the 3D printer to perform 3D printing, monitoring the running state of the 3D printer in real time in the printing process, and ensuring the normal running of the 3D printer;
and 1.4, after 3D printing is finished, preparing an oil reservoir pressure flooding model containing cracks, taking out the oil reservoir pressure flooding model after the oil reservoir pressure flooding model containing cracks is cooled and solidified, quenching, placing the oil reservoir pressure flooding model in a constant temperature box for baking, and taking out the oil reservoir pressure flooding model after baking is finished, and cooling.
Preferably, the three-dimensional core model is of a cylindrical structure, and the simulated wellhead is arranged as a hole of the cylindrical structure.
Preferably, in the step 1.4, the temperature of the constant temperature box is set to be 190 ℃ and the baking time is set to be 5h.
Preferably, the permeability calculation formula of the reservoir pressure flooding model is as follows:
wherein Q is the flow through the reservoir pressure flooding model and is expressed in cm 3 S; k is the permeability of the oil reservoir pressure flooding model and the unit is mum 2 (ii) a Mu is the viscosity of underground water and has the unit of mPa & s; a is the sectional area of the oil reservoir pressure flooding model and the unit is cm 2 ；ΔP r The reduced pressure difference between two seepage cross sections is 10 5 Pa; and delta L is the distance between two seepage sections, is equal to the length of the oil reservoir pressure flooding model, and has the unit of cm.
The invention has the following beneficial technical effects:
compared with the common mode of adopting a splitting method to make cracks on the rock core, the method for making the cracks on the rock core based on the 3D printing method has the advantages that the formed cracks are closer to the cracks formed in the reservoir during actual pressure-flooding construction, and the real simulation of the generation process of the cracks in the reservoir during the field pressure-flooding construction of the oil field is realized.
Meanwhile, the nuclear magnetic resonance test is carried out on the oil reservoir pressure-drive model after water flooding, the fracture morphology in the oil reservoir pressure-drive model after water flooding is obtained, the changes of the extension length and the fracture width of the fracture in the oil reservoir pressure-drive model before and after pressure flooding are contrasted, the structural change in the reservoir is directly obtained, the fracture distribution morphology in the pressure-drive reservoir is clearly shown, and a basis is provided for guiding the development of oil field pressure-drive.
Drawings
FIG. 1 is a schematic structural diagram of the low permeability reservoir pressure flooding fracture spread pattern testing device of the present invention.
FIG. 2 is a schematic structural diagram of the reservoir pressure flooding model of the present invention.
In the figure, 1, a displacement pump, 2, an intermediate container, 3, a core holder, 4, a waste liquid recovery container, 5, a liquid flow meter, 6, an oil reservoir pressure driving model, 7, a manual pump, 8, an inlet pressure gauge, 9, an outlet pressure gauge, 10, a confining pressure gauge, 11, a first control valve, 12, a second control valve, 13 and a third control valve.
Detailed Description
The invention is described in further detail below with reference to the figures and examples.
The invention provides a low-permeability reservoir pressure flooding fracture spread form testing device, which comprises a displacement pump 1, an intermediate container 2, a rock core holder 3 and a waste liquid recovery container 4, as shown in figure 1.
The displacement pump 1 is used for providing displacement pressure, the output end of the displacement pump 1 is connected with the input end of the middle container 2 through a liquid inlet pipeline, underground water is filled in the middle container 2, the output end of the middle container 2 is connected with one end of the core holder 3 through a liquid outlet pipeline, the other end of the core holder 3 is connected with the waste liquid recovery container 4 through a waste liquid pipeline, the waste liquid recovery container is used for recovering waste liquid discharged from the core holder, a liquid flowmeter 5 is arranged on the waste liquid pipeline, an oil reservoir pressure drive model 6 is fixed inside the core holder 3, a manual pump 7 is arranged on the core holder 3, and the manual pump 7 is connected with the core holder through an injection pipeline.
A first control valve 11 is arranged on the liquid inlet pipeline, a second control valve 12 and an inlet pressure gauge 8 are arranged on the liquid outlet pipeline, the second control valve 12 is arranged on one side close to the middle container, and the inlet pressure gauge 8 is arranged on one side close to the core holder and used for measuring the inlet pressure of the core holder; a third control valve 13 and an outlet pressure gauge 9 are arranged on the waste liquid pipeline, the third control valve 13 is arranged on one side close to the liquid flowmeter, and the outlet pressure gauge 9 is arranged on one side close to the rock core holder and used for measuring the outlet pressure of the rock core holder; and a confining pressure gauge 10 is arranged on the injection pipeline and is used for measuring confining pressure in the core holder.
The invention also provides a method for testing the low-permeability reservoir pressure drive fracture spread form, which adopts the device for testing the low-permeability reservoir pressure drive fracture spread form and specifically comprises the following steps:
step 1, an oil reservoir pressure drive model containing cracks is manufactured based on a 3D printing method, in the embodiment, a Beijing Longyuan AFS-360 printer is adopted as a 3D printer, the 3D printer comprises a controller, a forming machine, a refrigerating device and a ventilator, and the forming machine is used as a core part of the 3D printer and comprises a laser source, a forming cylinder, a material cylinder, a heating box and a powder spreading device.
The method for manufacturing the oil reservoir pressure flooding model of the crack by using the 3D printer specifically comprises the following substeps:
step 1.1, constructing a three-dimensional core model by using three-dimensional drawing software SolidWorks, and storing the constructed three-dimensional core model in a start file, as shown in FIG. 2, wherein the three-dimensional core model constructed in the embodiment is of a cylindrical structure, has a height L and a diameter D and is used for simulating a reservoir where a water injection well is located, a simulation well head is drilled at the central position of the three-dimensional core model, and the simulation well head is set to have a height L 1 Diameter D 1 The cylinder hole is used for simulating the wellhead of the water injection well, a plurality of cracks are arranged at the bottom of the simulating wellhead,crack length L 3 And the width is d, and the simulation device is used for simulating cracks around the water injection well.
Step 1.2, fill the material jar of 3D printer with the resin sand of capacity in this embodiment for the sand face of 3D printer material jar and shaping jar is roughly leveled the back, utilizes the dust catcher to clear up the resin sand on the 3D printer magnetic guide rail earlier, and reuse cotton or toilet paper clear up the magnetic guide rail once more, prevents that the powder paving device of 3D printer from taking place the friction with the resin sand that scatters when moving on the magnetic guide rail, damaging the magnetic guide rail of 3D printer.
After the magnetic guide rail of the 3D printer is cleaned, the stl file stored with the three-dimensional core model is processed, the three-dimensional core model is cut according to the slice thickness of 0.2mm, a slice file in a cli format is generated, scanning track parameters are set on a forming machine of the 3D printer by utilizing Arps software, tracks are generated and stored in the afi file, a powder spreading device of the 3D printer is controlled according to the generated tracks to spread powder, the sand surfaces of a material cylinder and a forming cylinder of the 3D printer are smooth, if resin sand in the material cylinder overflows in the powder spreading process, the overflowing resin sand needs to be cleaned in time, and if the sand surfaces of the material cylinder and the forming cylinder cannot be spread flat at one time, the powder spreading device can be used for spreading powder for multiple times.
Step 1.3, setting the finishing temperature of the 3D printer to be 65 ℃, starting the 3D printer to perform 3D printing, monitoring the running state of the 3D printer in real time in order to ensure the normal running of the 3D printer, controlling a laser to emit laser in the 3D printing process, scanning according to preset information of the current layer of the three-dimensional rock core model, scanning and sintering the laser to form a solid, wherein the area which is not scanned by the laser is still powder and can be used as the support of parts of the lower layer. And after the laser sintering is finished for one layer, moving the forming cylinder downwards by 0.2mm, moving the material cylinder upwards by 0.2mm, spreading powder again by the powder spreading device, continuously scanning the sand body, and repeating the processes until the last layer of the three-dimensional core model is printed to obtain the three-dimensional core model with cracks.
And 1.4, after 3D printing is finished, opening a forming cylinder for cooling for 1h, taking out the oil reservoir pressure-flooding model for quenching treatment after the oil reservoir pressure-flooding model containing cracks is cooled and solidified, enhancing the surface hardness of the oil reservoir pressure-flooding model, placing the oil reservoir pressure-flooding model in a constant temperature box at the temperature of 190 ℃ for baking for 5h, and taking out the oil reservoir pressure-flooding model for cooling.
And 2, obtaining formation water in an actual reservoir, injecting the formation water into the intermediate container, placing the oil reservoir pressure drive model containing the fractures in the core holder, and enabling the first control valve, the second control valve and the third control valve to be in a closed state.
And 3, setting an initial confining pressure value Pw and an initial flow rate Qw, controlling a manual pump to apply confining pressure to an oil reservoir pressure drive model in the core holder, opening a first valve, a second valve, a third valve and a displacement pump after the confining pressure value applied to the oil reservoir pressure drive model is increased to the initial confining pressure value Pw, setting the flow rate of the displacement pump to the initial flow rate Qw, performing water drive, recording readings of an inlet pressure gauge, an outlet pressure gauge and a liquid flowmeter, and obtaining the initial permeability of the oil reservoir pressure drive model by combining the sectional area of the oil reservoir pressure drive model.
And 4, when the readings of the liquid flow meter are consistent with the flow rate of the displacement pump, the oil reservoir pressure drive model reaches a stable state, the confining pressure value of the oil reservoir pressure drive model is kept unchanged, the flow rate of the displacement pump is changed, water drive is continuously carried out on the oil reservoir pressure drive model, the readings of an inlet pressure gauge, an outlet pressure gauge and the liquid flow meter are recorded, the permeability of the oil reservoir pressure drive model is obtained in real time by using a formula (1) in combination with the sectional area of the oil reservoir pressure drive model, and the first valve, the second valve, the third valve and the displacement pump are closed until the permeability of the oil reservoir pressure drive model reaches five times of the initial permeability.
The permeability calculation formula of the oil reservoir pressure flooding model in the embodiment is as follows:
wherein Q is the flow through the reservoir pressure flooding model and is expressed in cm 3 S; k is the permeability of the oil reservoir pressure flooding model and the unit is mum 2 (ii) a Mu is the viscosity of underground water and has the unit of mPa & s; a is the sectional area of the oil reservoir pressure flooding model and the unit is cm 2 ；ΔP r The reduced pressure difference between two seepage cross sections is 10 5 Pa; and the delta L is the distance between two seepage sections, is equal to the length of the oil reservoir pressure flooding model and has the unit of cm.
And 5, taking the oil reservoir pressure-flooding model out of the core holder, carrying out nuclear magnetic resonance test on the oil reservoir pressure-flooding model by using a nuclear magnetic resonance instrument, obtaining the distribution rule of the fluid after pressure flooding in each pore of the oil reservoir pressure-flooding model, and determining the extension length and the width of the crack in the oil reservoir pressure-flooding model before and after pressure flooding.
According to the embodiment, the fracture expansion form of the reservoir in the pressure flooding water injection process is really obtained by simulating the pressure flooding water injection process and comparing the extension length and the width of the fracture in the reservoir pressure flooding model before and after pressure flooding, and a basis is provided for guiding pressure flooding development.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (8)
1. A low permeability reservoir pressure flooding crack spread pattern testing device is characterized by comprising a displacement pump, an intermediate container, a rock core holder and a waste liquid recovery container;
the output end of the displacement pump is connected with the input end of the intermediate container through a liquid inlet pipeline, the output end of the intermediate container is connected with one end of the core holder through a liquid outlet pipeline, the other end of the core holder is connected with a waste liquid recovery container through a waste liquid pipeline, and a liquid flowmeter is arranged on the waste liquid pipeline;
an oil reservoir pressure drive model is fixed inside the core holder, and a manual pump is arranged on the core holder and connected with the core holder through an injection pipeline.
2. The low permeability reservoir pressure flooding fracture spread pattern testing device of claim 1, wherein an inlet pressure gauge is disposed on one side of the liquid outlet pipeline close to the core holder, an outlet pressure gauge is disposed on one side of the waste liquid pipeline close to the core holder, and a confining pressure gauge is disposed on the injection pipeline.
3. The low permeability reservoir pressure flooding fracture spread pattern testing device of claim 2, wherein a first control valve is arranged on the liquid inlet pipeline, a second control valve is arranged on one side of the liquid outlet pipeline close to the middle container, a third control valve is arranged on the waste liquid pipeline, and the third control valve is positioned between the core holder and the liquid flow meter.
4. A low permeability reservoir pressure flooding fracture spread form test method is characterized in that the low permeability reservoir pressure flooding fracture spread form test device of any one of claims 1-3 is adopted, and the method specifically comprises the following steps:
step 1, manufacturing an oil reservoir pressure flooding model containing cracks based on a 3D printing method;
step 2, obtaining formation water in an actual reservoir, injecting the formation water into an intermediate container, and then placing an oil reservoir pressure drive model containing fractures in a core holder, wherein the first control valve, the second control valve and the third control valve are all in a closed state;
step 3, setting an initial confining pressure value and an initial flow rate, controlling a manual pump to apply confining pressure to an oil reservoir pressure drive model in the core holder, opening a first valve, a second valve, a third valve and a displacement pump after the confining pressure value borne by the oil reservoir pressure drive model is increased to the initial confining pressure value, setting the flow rate of the displacement pump as the initial flow rate, then performing water drive, recording readings of an inlet pressure gauge, an outlet pressure gauge and a liquid flowmeter, and combining the sectional area of the oil reservoir pressure drive model to obtain the initial permeability of the oil reservoir pressure drive model;
step 4, when the readings of the liquid flow meter are consistent with the flow rate of the displacement pump, the oil reservoir pressure drive model reaches a stable state, the confining pressure value borne by the oil reservoir pressure drive model is kept unchanged, the flow rate of the displacement pump is changed to continue water drive on the oil reservoir pressure drive model, the readings of an inlet pressure gauge, an outlet pressure gauge and the liquid flow meter are recorded, the sectional area of the oil reservoir pressure drive model is combined, the permeability of the oil reservoir pressure drive model is obtained in real time, and the first valve, the second valve, the third valve and the displacement pump are closed until the permeability of the oil reservoir pressure drive model is five times of the initial permeability;
and 5, taking the oil reservoir pressure-flooding model out of the core holder, carrying out nuclear magnetic resonance test on the oil reservoir pressure-flooding model by using a nuclear magnetic resonance instrument, obtaining the distribution rule of the fluid after pressure flooding in each pore of the oil reservoir pressure-flooding model, and determining the extension length and the width of the crack in the oil reservoir pressure-flooding model before and after pressure flooding.
5. The low permeability reservoir pressure drive fracture spread pattern testing device of claim 4, wherein the step 1 comprises the following substeps:
1.1, constructing a three-dimensional core model by using three-dimensional drawing software, wherein the three-dimensional core model is constructed and used for simulating a reservoir where a water injection well is located, a simulation well mouth used for simulating a well mouth of the water injection well is arranged in the center of the three-dimensional core model, and a plurality of cracks are arranged at the bottom of the simulation well mouth and used for simulating cracks around the water injection well;
step 1.2, filling resin sand into a material cylinder of the 3D printer, cleaning a magnetic guide rail of the 3D printer by using a dust collector, setting scanning track parameters and generating tracks, and controlling a powder paving device of the 3D printer to perform powder paving treatment according to the generated tracks so as to level the sand surfaces of the material cylinder and a forming cylinder of the 3D printer;
step 1.3, setting the temperature of the 3D printer, starting the 3D printer to perform 3D printing, monitoring the running state of the 3D printer in real time in the printing process, and ensuring the normal running of the 3D printer;
and 1.4, after 3D printing is finished, preparing a fractured oil reservoir pressure-drive model, taking out the oil reservoir pressure-drive model after the fractured oil reservoir pressure-drive model is cooled and solidified and quenching, placing the oil reservoir pressure-drive model in a constant temperature box for baking, and taking out the oil reservoir pressure-drive model after baking is finished and cooling.
6. The low permeability reservoir pressure flooding fracture spread pattern testing device of claim 5, wherein the three-dimensional core model is of a cylindrical structure, and the simulated well head is provided as a hole of the cylindrical structure.
7. The low permeability reservoir pressure drive fracture spread pattern testing device of claim 6, wherein in step 1.4, the temperature of the constant temperature box is set to 190 ℃ and the baking time is set to 5h.
8. The low permeability reservoir pressure flooding fracture spread pattern testing device of claim 4, wherein the permeability calculation formula of the reservoir pressure flooding model is as follows:
wherein Q is the flow through the reservoir pressure flooding model and is expressed in cm 3 S; k is the permeability of the oil reservoir pressure flooding model and the unit is mum 2 (ii) a μ is the viscosity of groundwater in mPa · s; a is the sectional area of the oil reservoir pressure flooding model and the unit is cm 2 ；ΔP r The reduced pressure difference between two seepage cross sections is 10 5 Pa; and the delta L is the distance between two seepage sections, is equal to the length of the oil reservoir pressure flooding model and has the unit of cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211290051.3A CN115614032A (en) | 2022-10-21 | 2022-10-21 | Low-permeability reservoir pressure flooding fracture spread form testing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211290051.3A CN115614032A (en) | 2022-10-21 | 2022-10-21 | Low-permeability reservoir pressure flooding fracture spread form testing device and method |
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| Publication Number | Publication Date |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118030034A (en) * | 2024-04-10 | 2024-05-14 | 中国石油大学(华东) | Visual simulation device, system and method for reservoir oil displacement fluid state |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729904A (en) * | 2015-03-31 | 2015-06-24 | 中国石油大学(华东) | Complicated rock core preparation method based on CT scanning and 3D printing |
| CN206192988U (en) * | 2016-10-31 | 2017-05-24 | 中国石油化工股份有限公司 | Hypotonic oil reservoir fracturing crack analogue test device |
| CN109612896A (en) * | 2018-09-25 | 2019-04-12 | 西安石油大学 | True sandstone core physical simulation and Displacement Efficiency method containing crack |
| US20200221954A1 (en) * | 2016-12-07 | 2020-07-16 | Progenity, Inc. | Gastrointestinal tract detection methods, devices and systems |
| CN114527004A (en) * | 2022-02-23 | 2022-05-24 | 华美孚泰油气增产技术服务有限责任公司 | Visual experiment method for dynamic expansion of internal cracks of real reduction rock core |
| CN114645698A (en) * | 2022-05-19 | 2022-06-21 | 山东石油化工学院 | Low-permeability reservoir pressure flooding water injection physical simulation test system and method |
-
2022
- 2022-10-21 CN CN202211290051.3A patent/CN115614032A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729904A (en) * | 2015-03-31 | 2015-06-24 | 中国石油大学(华东) | Complicated rock core preparation method based on CT scanning and 3D printing |
| CN206192988U (en) * | 2016-10-31 | 2017-05-24 | 中国石油化工股份有限公司 | Hypotonic oil reservoir fracturing crack analogue test device |
| US20200221954A1 (en) * | 2016-12-07 | 2020-07-16 | Progenity, Inc. | Gastrointestinal tract detection methods, devices and systems |
| CN109612896A (en) * | 2018-09-25 | 2019-04-12 | 西安石油大学 | True sandstone core physical simulation and Displacement Efficiency method containing crack |
| CN114527004A (en) * | 2022-02-23 | 2022-05-24 | 华美孚泰油气增产技术服务有限责任公司 | Visual experiment method for dynamic expansion of internal cracks of real reduction rock core |
| CN114645698A (en) * | 2022-05-19 | 2022-06-21 | 山东石油化工学院 | Low-permeability reservoir pressure flooding water injection physical simulation test system and method |
Non-Patent Citations (2)
| Title |
|---|
| 于淼等: "缝洞油藏3D打印技术及水驱剩余油分布规律研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》, 15 July 2019 (2019-07-15), pages 1 - 83 * |
| 张翼飞等: "低渗透油藏压驱物理模拟与裂缝定量表征", 《油气地质与采收率》, 30 July 2022 (2022-07-30), pages 143 - 149 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118030034A (en) * | 2024-04-10 | 2024-05-14 | 中国石油大学(华东) | Visual simulation device, system and method for reservoir oil displacement fluid state |
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