CN110685659A - Low-permeability medium hydraulic fracturing modification three-dimensional simulation system and use method - Google Patents
Low-permeability medium hydraulic fracturing modification three-dimensional simulation system and use method Download PDFInfo
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- CN110685659A CN110685659A CN201911086020.4A CN201911086020A CN110685659A CN 110685659 A CN110685659 A CN 110685659A CN 201911086020 A CN201911086020 A CN 201911086020A CN 110685659 A CN110685659 A CN 110685659A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The embodiment of the invention discloses a low-permeability medium hydraulic fracturing modification three-dimensional simulation system and a use method thereof, wherein the low-permeability medium hydraulic fracturing modification three-dimensional simulation system comprises a main body device, a fracturing system and a pressure measuring system; the main body device comprises a container, a drainage bottom plate, geotextile, a pebble cushion layer, a simulation medium and a lead block; the fracturing system comprises a liquid storage tank, a pressure pump, a fracturing pipe, a fracturing fluid return pipe, a flowmeter and a pressure gauge. The low-permeability medium hydraulic fracturing modified three-dimensional simulation system provided by the invention realizes the characterization of low permeability and heterogeneous medium by taking different grading cohesive soil and sand soil as simulation media, and the constructed physical model considers multiple fracturing modes such as horizontal fracturing, vertical fracturing and the like and detailed control factors, so that the research of the fracturing mechanism of shallow low-permeability rock soil medium, which is different from the deep-buried high-ground-pressure geological environment, is realized; and a scientific basis is provided for promoting the modeling and standardization of the site remediation and treatment technology.
Description
Technical Field
The embodiment of the invention relates to the field of polluted site soil and underground water environment restoration treatment, in particular to a low-permeability medium hydraulic fracturing modification three-dimensional simulation system and a use method thereof.
Background
The polluted site refers to a land parcel in which pollutants in soil or underground water exceed a certain threshold value and which may generate or cause damage to the ecological environment of the site. With the rapid development of social economy and the adjustment of urban layout, the restoration of polluted sites with potential risks to human health gradually becomes an environmental hotspot problem. After years of research, scholars at home and abroad put forward various methods for repairing polluted sites, and the methods are divided into physical, chemical, biological and composite treatment technologies according to the core principle of the repair technology. In the process of repairing a polluted site, particularly in a low-permeability medium, the migration and transformation rules of microcosmically polluted substances in a solid-liquid-gas multiphase state in the medium are influenced; macroscopically, the method is controlled by the difference of hydrogeological conditions of different polluted sites and the heterogeneity of media, so that the method has uncertainty on the repair efficiency, the reference significance of the repair experience of different polluted sites is limited, and the repair scheme is determined by experience and laboratory or site pilot plant experiments.
The fracturing technology is applied to the yield increase of petroleum and the exploitation of shale gas at the earliest time, artificial fractures are formed by pressurizing rock-soil layers, and viscosity agents, propping agents and the like are injected to prevent the fractures from being closed. The proppant generally adopts coarser particles compared with the primary medium, and is filled in fracture grids formed by fracturing to increase the permeability of the medium; meanwhile, the extension of the crack can change the original structure of the medium, so that the heterogeneity is improved. The research of foreign scholars shows that the fracturing cracks are preferentially expanded in the primary cracks, the main factors influencing the fracturing grid form and the influence range in the medium comprise fracturing pressure, fracturing form, fracturing fluid property, physicochemical indexes of rock and soil medium and the like, and the research of the fracturing mechanism is mostly concentrated in the oil and gas field exploitation field.
In the aspect of polluted site restoration, researches mostly focus on the combination of a hydraulic fracturing method as a low-permeability stratum site restoration pretreatment method and other technologies so as to achieve the restoration target. Shakib et al discovered that the combination of hydraulic fracturing techniques with soil vapor extraction techniques increases the rate of conversion of contaminants between stationary and non-stationary phases; injecting hot steam into the fractured cracks by Nilsson, and treating field pollution by using a vapor extraction method to finally reduce the content of pollutants in the extraction well within the range of 1.5-3.9 m to 43 percent and reduce the content of pollutants in the extraction well within the range of 3.9-5.5 m to 72 percent. Wendy J.Davis-Hoover injects oxygen, carbon source, nitrogen source and the like after a crack is manufactured by a hydraulic fracturing method, so that the bioremediation efficiency of a low-permeability medium polluted site is improved; tzovolou et al further investigated the mechanism of this combination of techniques for the removal of volatile, semi-volatile, and non-volatile organic compounds through experimentation. Siegrist uses hydraulic fracturing and advanced oxidation technology in DCE polluted field, and uses potassium permanganate as oxidant. The concentration of DCE in the field decreased by 70% after 10 months. Domestic research has less research on the hydraulic fracturing mechanism and the application thereof, only the indoor cylinder physical model is used for the unicorn, the hydraulic fracturing technology and the advanced oxidation technology are combined, and the removal rate of TCE is improved from 43.2% to 66.3%.
In conclusion, the hydraulic fracturing technology as an important pretreatment method can be used together with various mature repair technologies to repair low-permeability polluted sites and effectively increase the efficiency of artificial strengthening measures.
Therefore, the research on the low-permeability medium hydraulic fracturing modification three-dimensional simulation system is an effective supplement to the current approaches that site repair parameter sources mainly depend on experience, tests in laboratories or sites and the like, and provides scientific basis for promoting the modeling and standardization of site repair treatment technologies.
Disclosure of Invention
Therefore, the embodiment of the invention provides a low-permeability medium hydraulic fracturing modification three-dimensional simulation system and a using method thereof, so as to solve the problem that tests are carried out in an experience, laboratory or field in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to a first aspect of the embodiments of the present invention, a low-permeability medium hydraulic fracturing modification three-dimensional simulation system is provided, which includes a main body device, a fracturing system and a pressure measurement system;
the main body device comprises a container, a drainage bottom plate arranged at the bottom of the container, geotextile arranged above the drainage bottom plate, a pebble cushion layer arranged above the geotextile, a simulation medium arranged above the pebble cushion layer and a lead block arranged above the simulation medium;
the fracturing system comprises a liquid storage tank for storing fracturing liquid, a pressure pump, a fracturing pipe, a fracturing liquid return pipe, a flowmeter and a pressure gauge, wherein one end of the fracturing pipe extends into a pebble cushion layer of a container, the other end of the fracturing pipe is connected with an outlet of the pressure pump, an inlet of the pressure pump is connected with the liquid storage tank, one end of the fracturing liquid return pipe is communicated with the bottom of the container, and the other end of the fracturing liquid return pipe extends into the liquid storage tank;
the pressure measuring system comprises a reserved horizontal fracturing pipe, a flowmeter, a pressure gauge and a valve, wherein the flowmeter, the pressure gauge and the valve are arranged on the reserved horizontal fracturing pipe, one end of the reserved horizontal fracturing pipe is communicated with the fracturing pipe outside the container, and the other end of the reserved horizontal fracturing pipe is communicated with the fracturing fluid return pipe.
Further, the fracturing fluid comprises distilled water, a propping agent and a viscosity agent.
Furthermore, the particle size of the propping agent is 0.05-0.5 mm.
Further, the mass percentage concentration of the viscosity agent is 1-5%.
Further, the viscosity agent comprises sodium carboxymethyl cellulose.
Furthermore, the fracturing pipe on be equipped with flowmeter, manometer and valve, fracturing fluid flow back be equipped with manometer and valve on the pipe, adjust important parameters such as fracturing fluid flow of fracturing manometer.
Furthermore, the simulation medium comprises the heterogeneity of clay and silt to describe the porous medium.
Furthermore, the water content of the simulated medium is 5% -medium saturation.
According to a second aspect of the embodiments of the present invention, there is provided a use method of a low-permeability medium hydraulic fracture modification three-dimensional simulation system, including the following steps:
simulating medium filling and physical and chemical property measurement; filling a simulation medium into a container of the main body device, wherein a drainage bottom plate, geotextile, a pebble cushion layer, the simulation medium and a lead block are sequentially arranged in the container from bottom to top, and the simulation medium is used for measuring an initial permeability coefficient, density, porosity and organic matters before filling;
secondly, pressurizing and measuring the main device; pressurizing the simulated medium by adopting a screw pump, wherein the arrangement form of the fracturing pipe is divided into vertical arrangement and horizontal arrangement; the continuous pressurization and the pulse pressurization are adjusted by controlling a valve; performing orthogonal test by using the water content of the medium, the concentration of the fracturing viscosity agent, the particle size of the propping agent and the fracturing pressure as control factors to obtain a simulated medium modified osmotic coefficient K value of 1 multiplied by 10-4cm/s is a boundary solving condition, corresponds to data of a plurality of groups of medium water content, fracturing viscosity agent concentration, proppant particle size and fracturing pressure, and establishes a function relation between the medium water content, the fracturing viscosity agent concentration, the proppant particle size, the fracturing pressure and the permeability coefficient K;
step three, identifying a modification mode and screening and optimizing a fracturing mode; and solving and analyzing the variable medium water content, the fracturing viscosity agent concentration, the proppant particle size and the fracturing pressure by taking the permeability coefficient K as a boundary condition.
Furthermore, tracer fluorescein sodium is additionally added into the fracturing fluid, the change trend and the characteristics of the medium fracture in different fracturing modes are observed, and the fracturing mode for improving the overall permeability and the heterogeneity of the medium is identified.
The embodiment of the invention has the following advantages: the embodiment of the invention provides a low-permeability medium hydraulic fracturing modified three-dimensional simulation system, which realizes low-permeability and heterogeneous medium characterization by taking different graded cohesive soil and sand rock soil as simulation media, and a constructed physical model considers multiple fracturing modes such as horizontal fracturing, vertical fracturing and the like and detailed control factors, increases the reliability of fracturing mechanism research, and realizes the research of fracturing mechanism different from deep-buried high-ground-pressure geological environment and shallow low-permeability rock soil medium; and provides scientific basis for enriching the restoration method of the low-permeability medium polluted site and promoting the modeling and standardization of the site restoration treatment technology.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a low-permeability medium hydraulic fracture modification three-dimensional simulation system provided in embodiment 1 of the present invention;
in the figure: 1-pressure gauge; 2-a valve; 3-a pressure pump; 4, a container; 5, a flow meter; 6-fracturing the tube; 7-a simulated medium; 8, a drainage bottom plate; 9-reserving a horizontal fracturing pipe; 10-pebble cushion layer; 11-a liquid storage tank; 12-geotextile; 13-fracturing fluid; 14-lead block; 15-fracturing fluid return pipes.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that unless otherwise specified, technical terms or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention pertains, and experimental materials in the following examples are commercially available unless otherwise specified, and the experimental methods described are general experimental methods unless otherwise specified.
In view of the deficiencies in the prior art, the inventor of the present invention has made extensive studies and extensive practices to propose the technical solution of the present invention, and further explains the technical solution, the implementation process and the principle thereof, etc.
One aspect of the embodiment of the invention provides a low-permeability medium hydraulic fracturing modification three-dimensional simulation system, which comprises a main body device, a fracturing system and a pressure measuring system;
the main body device comprises a container 4, a drainage bottom plate 8 arranged at the bottom of the container 4, geotextile 12 arranged above the drainage bottom plate 8, a pebble cushion layer 10 arranged above the geotextile 12, a simulation medium 7 arranged above the pebble cushion layer 10, and a lead block 14 arranged above the simulation medium 7;
the fracturing system comprises a liquid storage tank 13 for storing fracturing liquid, a pressure pump 3, a fracturing pipe 6, a fracturing liquid return pipe 15, a flowmeter 5 and a pressure gauge 1, wherein one end of the fracturing pipe 6 extends into a pebble cushion layer 10 of a container 4, the other end of the fracturing pipe 6 is connected with an outlet of the pressure pump 3, an inlet of the pressure pump 3 is connected with the liquid storage tank 11, one end of the fracturing liquid return pipe 15 is communicated with the bottom of the container 4, and the other end of the fracturing liquid return pipe extends into the liquid storage tank 11;
the pressure measuring system comprises a reserved horizontal fracturing pipe 9, a flowmeter 5, a pressure gauge 1 and a valve 2, wherein the flowmeter 5, the pressure gauge 1 and the valve 2 are arranged on the reserved horizontal fracturing pipe 9, one end of the reserved horizontal fracturing pipe 9 is communicated with a fracturing pipe 6 outside a container 4, and the other end of the reserved horizontal fracturing pipe is communicated with a fracturing fluid backflow pipe 15.
Preferably, the fracturing fluid includes distilled water, proppant and viscosity agent, but is not limited thereto.
Preferably, the particle size of the propping agent is 0.05-0.5 mm, the mass percentage concentration of the viscosity agent is 1-5%, and the viscosity agent comprises sodium carboxymethylcellulose.
Preferably, the fracturing pipe 6 is provided with a flowmeter 5, a pressure gauge 1 and a valve 2, and the fracturing fluid backflow pipe 15 is provided with the pressure gauge 1 and the valve 2.
Preferably, the simulated medium comprises cohesive soil and silt to characterize the heterogeneity of the porous medium, and the water content of the simulated medium is 5% -medium saturation.
According to a second aspect of the embodiments of the present invention, there is provided a use method of a low-permeability medium hydraulic fracture modification three-dimensional simulation system, including the following steps:
step one, simulating medium 7 filling and physical and chemical property measurement; filling a simulation medium 7 into a container 4 of a main body device, wherein a drainage bottom plate 8, geotextile 12, a pebble cushion layer 10, the simulation medium 7 and a lead block 14 are sequentially arranged in the container 4 from bottom to top, and the simulation medium 7 is used for measuring an initial permeability coefficient, density, porosity and organic matters before filling;
secondly, pressurizing and measuring the main device; a screw pump is adopted to pressurize the simulation medium 7, and the arrangement form of the fracturing pipe 6 is divided into vertical arrangement and horizontal arrangement; the continuous pressurization and the pulse pressurization are adjusted by controlling the valve 2; containing water in a mediumOrthogonal test is carried out by taking the rate, the concentration of the fracturing viscosity agent, the particle size of the propping agent and the fracturing pressure as control factors, and the permeability coefficient K value reaches 1 multiplied by 10 after the obtained simulated medium is modified-4cm/s is a boundary solving condition, corresponds to data of a plurality of groups of medium water content, fracturing viscosity agent concentration, proppant particle size and fracturing pressure, and establishes a function relation between the medium water content, the fracturing viscosity agent concentration, the proppant particle size, the fracturing pressure and the permeability coefficient K;
step three, identifying a modification mode and screening and optimizing a fracturing mode; and solving and analyzing the variable medium water content, the fracturing viscosity agent concentration, the proppant particle size and the fracturing pressure by taking the permeability coefficient K as a boundary condition.
Preferably, a tracer fluorescein sodium is additionally added into the fracturing fluid 13, the change trend and the characteristics of the medium fracture in different fracturing modes are observed, and the fracturing mode for improving the overall permeability and the heterogeneity of the medium is identified.
The principle of the low-permeability medium hydraulic fracturing modification three-dimensional simulation system provided by the invention is as follows: the method comprises the steps of using cohesive soil and silt with different proportions as simulation media to achieve low permeability and heterogeneous medium characterization, and constructing an orthogonal test of a physical model by using fracturing Pressure (PF), viscosity agent concentration (alpha) in fracturing fluid, medium water content (theta) and proppant particle size (d) as variables based on test conditions of continuous pressurization and pulse pressurization. According to the requirement of the in-situ repair method on medium permeability, a target K value of medium fracture modification is set to be 1 x 10 < -4 > cm/s, boundary conditions solved by the test are assumed, PFi, alpha i, theta i and di of each test set are measured when the conditions are met, and the fitting of a function relation between variables and K is tried, namely K is F (PFi, alpha i, theta i and di).
1) Construction of low permeability medium fracturing physical model
The physical model ① test system comprises a main body device, a fracturing system and a pressure measuring system, as shown in figure 1, the main body device is used for bearing a simulation medium 6, namely a main area of a fracturing process, the dimension BxLxH is 50cm x 70cm, cohesive soil and silt are selected as the simulation medium 6 and filled into the main body device, the medium structures from bottom to top are a drainage bottom plate 8, a geotechnical cloth 12, a pebble cushion layer 10, a simulation medium 7 and a lead block 14 respectively, the fracturing system is composed of fracturing fluid 13 (distilled water and sodium carboxymethyl cellulose), a pressure pump 3, a fracturing pipe 6, a related valve 2 and a flow meter 5, and the pressure measuring system is mainly composed of a pressure gauge at a fracturing inlet end, a pressure gauge 1 of a fracturing return pipe 15 and a pressure measuring pipe on the side wall of the.
2) Control mechanism research of fracturing modification of shallow low-permeability medium
And measuring the physical and chemical indexes of the simulated medium, such as initial permeability coefficient, density, porosity, organic matters and the like.
For the research purpose of realizing the fracturing modification control mechanism of the shallow low-permeability medium, the main control factors considered in the test comprise the water content (theta) of the medium, the concentration (alpha) of a fracturing viscosity agent (sodium carboxymethyl cellulose), the particle size (d) of a propping agent and the fracturing Pressure (PF); the physical model test fracturing modes comprise vertical fracturing and horizontal fracturing; the pressurizing mode comprises continuous pressurizing and pulse pressurizing; in the test variables, the value range of theta is 5% -saturation state, and the value range of alpha is 1-5%; d, considering the particle size range of fine sand to medium sand, namely 0.05-0.5 mm; the parameters adopt an orthogonal mode to construct a test working condition, and the fracturing Pressure (PF) is adjusted in the test process, so that the permeability coefficient K of the simulated medium is adjusted to 1 multiplied by 10-4In the order of cm/s. Based on the output measurements of the control factors, an attempt was made to analyze the variables (PF, α, θ, d) as a function of K.
The technical solution of the present invention is further described in detail by the following examples. However, the examples are chosen only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1
The embodiment provides a use method of a low-permeability medium hydraulic fracturing modified three-dimensional simulation system, which comprises the following steps:
in the first step, the filling of the medium 7 and the determination of the physicochemical properties are simulated. Filling a simulation medium 7 into the main body device, wherein the medium structures from bottom to top are a drainage bottom plate 8, geotextile 12, a pebble cushion layer 10, the simulation medium 7 and a lead block 14. The drainage bottom plate 8: a drain for model fluid; geotextile 12: the water permeability is ensured, and simultaneously, the loss of the medium is prevented; pebble cushion layer 10: smooth drainage of fluid at the bottom of the model is ensured; simulation medium 7: the low-permeability medium is a research object; the lead block 14 covers the surface layer to prevent the medium structure from being completely damaged due to overlarge aeration pressure. The physical and chemical indexes of the simulation medium 7 to be measured before filling include: initial permeability coefficient, density, porosity, organic matter, and the like.
The second step is as follows: the main body apparatus was subjected to pressure measurement. And (3) a WL-type screw pump (the technical parameters are that the flow is 1.1-150 m3/h, the pressure is 0.6-2.4 MPA, and the rotating speed is 180-250 r/min) is adopted for pressurizing the simulation medium 7, and a valve 2 is arranged at a water outlet to further control the pressure and the flow for pressing the simulation medium 7. The fracturing pipe 6 is arranged vertically and horizontally; the continuous pressurization and the pulse pressurization are adjusted by controlling a valve; orthogonal tests were performed taking into account the water content of the medium (θ), the concentration of the fracturing viscosity agent (sodium carboxymethylcellulose) (α), the proppant particle size (d), and the fracturing Pressure (PF) as controlling factors. And obtaining corresponding data of a plurality of groups of PF, alpha, theta and d when the permeability coefficient K value reaches 1 multiplied by 10 < -4 > cm/s after the simulation medium is modified as a boundary solving condition, and establishing a functional relation between the (PF, alpha, theta, d) and K.
The third step: and (4) identifying a modification mode and screening and optimizing a fracturing mode. The solution of K as boundary condition to the variables PF, alpha, theta and d can only show that the seepage rate of the modified medium fluid reaches 1 x 10-4cm/s, but the change of seepage conditions is realized by forming more remarkable 'dominant channels' after fracturing or improving the overall permeability and heterogeneity of the medium, and further analysis is needed. The tracer fluorescein sodium is additionally added into the fracturing fluid, the change trend and the characteristics of the medium fracture in different fracturing modes are observed, and the fracturing mode for improving the integral permeability and the heterogeneity of the medium is identified.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A low-permeability medium hydraulic fracturing modified three-dimensional simulation system is characterized in that: the fracturing system comprises a main body device, a fracturing system and a pressure measuring system;
the main body device comprises a container, a drainage bottom plate arranged at the bottom of the container, geotextile arranged above the drainage bottom plate, a pebble cushion layer arranged above the geotextile, a simulation medium arranged above the pebble cushion layer and a lead block arranged above the simulation medium;
the fracturing system comprises a liquid storage tank for storing fracturing liquid, a pressure pump, a fracturing pipe, a fracturing liquid return pipe, a flowmeter and a pressure gauge, wherein one end of the fracturing pipe extends into a pebble cushion layer of a container, the other end of the fracturing pipe is connected with an outlet of the pressure pump, an inlet of the pressure pump is connected with the liquid storage tank, one end of the fracturing liquid return pipe is communicated with the bottom of the container, and the other end of the fracturing liquid return pipe extends into the liquid storage tank;
the pressure measuring system comprises a reserved horizontal fracturing pipe, a flowmeter, a pressure gauge and a valve, wherein the flowmeter, the pressure gauge and the valve are arranged on the reserved horizontal fracturing pipe, one end of the reserved horizontal fracturing pipe is communicated with the fracturing pipe outside the container, and the other end of the reserved horizontal fracturing pipe is communicated with the fracturing fluid return pipe.
2. The low permeability medium hydraulic fracture modified three-dimensional simulation system of claim 1, wherein: the fracturing fluid comprises distilled water, a propping agent and a viscosity agent.
3. The low permeability medium hydraulic fracture modified three-dimensional simulation system of claim 2, wherein: the particle size of the proppant is 0.05-0.5 mm.
4. The low permeability medium hydraulic fracture modified three-dimensional simulation system of claim 2, wherein: the mass percentage concentration of the viscosity agent is 1-5%.
5. The low permeability medium hydraulic fracture modified three-dimensional simulation system of claim 2, wherein: the viscosity agent comprises sodium carboxymethyl cellulose.
6. The low permeability medium hydraulic fracture modified three-dimensional simulation system of claim 1, wherein: the fracturing fluid backflow pipe is provided with a flowmeter, a pressure gauge and a valve, and the fracturing fluid backflow pipe is provided with the pressure gauge and the valve.
7. The low permeability medium hydraulic fracture modified three-dimensional simulation system of claim 1, wherein: the simulation medium comprises clay and silt.
8. The low permeability medium hydraulic fracture modified three-dimensional simulation system of claim 1, wherein: the water content of the simulated medium is 5% -medium saturation.
9. A method of using the low permeability medium hydraulic fracture modification three-dimensional simulation system of any one of claims 1-8, comprising the steps of:
simulating medium filling and physical and chemical property measurement; filling a simulation medium into a container of the main body device, wherein a drainage bottom plate, geotextile, a pebble cushion layer, the simulation medium and a lead block are sequentially arranged in the container from bottom to top, and the simulation medium is used for measuring an initial permeability coefficient, density, porosity and organic matters before filling;
secondly, pressurizing and measuring the main device; pressurizing the simulated medium by adopting a screw pump, wherein the arrangement form of the fracturing pipe is divided into vertical arrangement and horizontal arrangement; the continuous pressurization and the pulse pressurization are adjusted by controlling a valve; performing orthogonal test by using the water content of the medium, the concentration of the fracturing viscosity agent, the particle size of the propping agent and the fracturing pressure as control factors to obtain a simulated medium modified osmotic coefficient K value of 1 multiplied by 10-4Solving condition with cm/s as boundaryCorresponding to data of a plurality of groups of medium water content, fracturing viscosity agent concentration, proppant particle size and fracturing pressure, and establishing a function relation between the medium water content, the fracturing viscosity agent concentration, the proppant particle size, the fracturing pressure and the permeability coefficient K;
step three, identifying a modification mode and screening and optimizing a fracturing mode; and solving and analyzing the variable medium water content, the fracturing viscosity agent concentration, the proppant particle size and the fracturing pressure by taking the permeability coefficient K as a boundary condition.
10. Use according to claim 9, characterized in that: and adding a tracer sodium fluorescein into the fracturing fluid to observe the change trend and characteristics of the medium fracture in different fracturing modes and identify the fracturing modes for improving the overall permeability and heterogeneity of the medium.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477687A (en) * | 2021-06-14 | 2021-10-08 | 中节能大地（杭州）环境修复有限公司 | Method for restoring low-permeability stratum contaminated soil through chemical oxidation in cooperation with hydraulic fracturing |
| CN113820248A (en) * | 2021-09-30 | 2021-12-21 | 浙江大学 | Landfill body dominant flow testing device and method based on tracer migration |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6502633B2 (en) * | 1997-11-14 | 2003-01-07 | Kent Cooper | In situ water and soil remediation method and system |
| CN107893652A (en) * | 2017-09-30 | 2018-04-10 | 中国石油大学(华东) | The hydraulic fracturing analogue experiment installation and method of the enhanced geothermal system of hot dry rock |
| CN108680339A (en) * | 2018-05-03 | 2018-10-19 | 中国石油大学(北京) | A kind of the visualization crack device and its working method of simulation fracture closure and leak-off |
| CN109779593A (en) * | 2019-01-29 | 2019-05-21 | 西南石油大学 | A kind of visualization plate crack device of achievable three-dimensional flow field test |
| CN109940033A (en) * | 2019-04-19 | 2019-06-28 | 四川省生态环境科学研究院 | A kind of soil moved in improve the original restorative procedure of heavy metals in farmland pollution |
-
2019
- 2019-11-08 CN CN201911086020.4A patent/CN110685659A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6502633B2 (en) * | 1997-11-14 | 2003-01-07 | Kent Cooper | In situ water and soil remediation method and system |
| CN107893652A (en) * | 2017-09-30 | 2018-04-10 | 中国石油大学(华东) | The hydraulic fracturing analogue experiment installation and method of the enhanced geothermal system of hot dry rock |
| CN108680339A (en) * | 2018-05-03 | 2018-10-19 | 中国石油大学(北京) | A kind of the visualization crack device and its working method of simulation fracture closure and leak-off |
| CN109779593A (en) * | 2019-01-29 | 2019-05-21 | 西南石油大学 | A kind of visualization plate crack device of achievable three-dimensional flow field test |
| CN109940033A (en) * | 2019-04-19 | 2019-06-28 | 四川省生态环境科学研究院 | A kind of soil moved in improve the original restorative procedure of heavy metals in farmland pollution |
Non-Patent Citations (1)
| Title |
|---|
| 张久麟: "水力压裂法修复TCE污染低渗介质的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477687A (en) * | 2021-06-14 | 2021-10-08 | 中节能大地（杭州）环境修复有限公司 | Method for restoring low-permeability stratum contaminated soil through chemical oxidation in cooperation with hydraulic fracturing |
| CN113820248A (en) * | 2021-09-30 | 2021-12-21 | 浙江大学 | Landfill body dominant flow testing device and method based on tracer migration |
| CN113820248B (en) * | 2021-09-30 | 2022-06-21 | 浙江大学 | Landfill body dominant flow testing device and method based on tracer migration |
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