CN113029992B - Experimental device and method for dynamic adsorption of viscoelastic fluid on surface of medium - Google Patents
Experimental device and method for dynamic adsorption of viscoelastic fluid on surface of medium Download PDFInfo
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- CN113029992B CN113029992B CN202110233059.5A CN202110233059A CN113029992B CN 113029992 B CN113029992 B CN 113029992B CN 202110233059 A CN202110233059 A CN 202110233059A CN 113029992 B CN113029992 B CN 113029992B
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 84
- 239000012530 fluid Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229920000642 polymer Polymers 0.000 claims abstract description 68
- 241000209094 Oryza Species 0.000 claims abstract description 34
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 34
- 235000009566 rice Nutrition 0.000 claims abstract description 34
- 238000002835 absorbance Methods 0.000 claims abstract description 30
- 238000011049 filling Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 9
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 230000031700 light absorption Effects 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000013178 mathematical model Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 52
- 230000014759 maintenance of location Effects 0.000 description 11
- 235000012054 meals Nutrition 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000003068 static effect Effects 0.000 description 7
- 239000006004 Quartz sand Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003795 desorption Methods 0.000 description 3
- 241000883990 Flabellum Species 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000721047 Danaus plexippus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229920005551 calcium lignosulfonate Polymers 0.000 description 1
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920000587 hyperbranched polymer Polymers 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000005320 surfactant adsorption Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
Abstract
The invention discloses an experimental device for dynamic adsorption of viscoelastic fluid on the surface of a medium, which comprises a fixed chassis, a cylindrical rice container and a power device, wherein the cylindrical rice container and the power device are arranged on the fixed chassis, the cylindrical wall of the cylindrical rice container is fixed on the upper end surface of the fixed chassis, the rotating shaft of the power device horizontally penetrates through one end of the cylindrical rice container and extends to the inner cavity of the cylindrical rice container, a plurality of fan blades are arranged on the part of the rotating shaft, which is positioned in the cylindrical rice container, an adsorption medium filling plate is arranged in the lower cylindrical wall of the cylindrical rice container, a solution absorbance detection device is arranged on the end surface of the cylindrical rice container, and the solution absorbance detection device is positioned near the adsorption medium filling plate. The invention solves the objective problem that the dynamic adsorption quantity of the conventional viscoelastic fluid is difficult to measure, lays a foundation for more accurately constructing a mathematical model, and provides data and method support for an oilfield polymer flooding numerical technology.
Description
Technical Field
The invention relates to an experimental device and method for dynamic adsorption of viscoelastic fluid on the surface of a medium, and belongs to the technical field of petroleum industrial equipment.
Background
Viscoelastic fluid is exchanged with solid medium in porous medium, and there is mechanical trapping between fluid with hydrodynamic size and porous medium, but adsorption retention is two unrelated physical/chemical processes, one is adsorption with physical/chemical and one is simple physical mechanical trapping. Adsorption is a widely existing natural phenomenon, can occur between any two interfaces, and can occur under both static conditions and dynamic conditions. The usual methods to measure fluid adsorption are static and dynamic methods (Zhangyi. amphiphilic polymer-surfactant adsorption retention characteristics on rock minerals study [ D ]. Dongying: China university of Petroleum. 2013.). The determination of the amount of viscoelastic fluid adsorbed under static conditions is generally performed by the differential concentration method, which is the most commonly used simple and effective method-a certain mass of pretreated adsorbent and a certain volume of solution of the oil displacement agent with known concentration are added into any sealable container, and after adsorption reaches equilibrium, the static adsorption amount is determined by the difference in solution concentration before and after mixing with the adsorbent sample. Another method is the measurement of sorption under core displacement dynamic flow conditions, which measures the amount of sorption as a function of time, including the cyclic method and the flow method. The cycling method is suitable for studying the Adsorption Kinetics on quartz sandstone, measuring the Adsorption/Desorption isotherms, and studying the effect of several factors on the Equilibrium Adsorption density on quartz sandstone, including the type and concentration of salts and the cycling rate (Baojun Bai, Yongfu Wu, Reid b. grid. Adsorption and Desorption Kinetics dynamics and Equilibrium of Calcium Lignosulfonate on Porous Media [ J ]. j.phys. chem.c,2009,113(31): 1-8); while the flow method is mainly used to study desorption in porous media (Reid B. Grigg, Baojun Bai. calcium lignosulformate addition and desorption on Berea sandstone. journal of Colloid and Interface Science,2004,279: 36-45). Static experimental studies are mature, but for the study of dynamic adsorption, the dynamic retention is often studied by applying the flow method in general, and the dynamic retention is actually the whole presentation of dynamic adsorption and mechanical complement and pore-throat retention (monarch, zhan, xu zhan, etc.. the adsorption retention characteristics of hyperbranched polymers on porous media [ J ]. chemical studies and applications, 2016,28(3): 360-. In view of the difficulty in distinguishing between dynamic adsorption and dynamic Retention, Zhang and Seright (Zhang G.Z., Seright R.S., Effect of Concentration on HPAM Retention in Porous Media [ J ]. SPE journal,2014,7: 373) obtained by studying the Effect of HPAM solution Concentration on adsorption Retention characteristics, by adopting experimental means different from conventional static adsorption, the adsorption amount measured in 6rad/min rotationally flowing solution is not affected by Concentration, and the semi-concentrated solution is affected by solution. Moreover, the adsorption process is instantaneous and irreversible; and after the adsorption on the surface of the quartz sand, the subsequent re-adsorption effect is relatively weak.
In summary, it can be found that there is no way to effectively distinguish between dynamic adsorption and dynamic retention of viscoelastic fluid on the surface of the media.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an experimental device and method for dynamic adsorption of viscoelastic fluid on the surface of a medium, and the experimental device and method can effectively distinguish the dynamic adsorption and retention of the viscoelastic fluid and provide an analysis method for seepage characteristic analysis of the fluid in a porous medium.
The technical scheme provided by the invention for solving the technical problems is as follows: the utility model provides an experimental apparatus of viscoelastic fluid at medium surface dynamic adsorption, includes fixed chassis and installs cylinder meal container, power device on the fixed chassis, the cylinder wall of cylinder meal container is fixed on the up end of fixed chassis, power device's axis of rotation level passes the one end of cylinder meal container and extends to the inner chamber of cylinder meal container, the part that the axis of rotation is located cylinder meal container is equipped with a plurality of flabellum, and its axis of rotation drives the flabellum and rotates along the cylinder wall in cylinder meal container, be equipped with adsorption medium packing plate in the lower cylinder wall of cylinder meal container, be equipped with solution absorbance detection device on the terminal surface of cylinder meal container, solution absorbance detection device is located near adsorption medium packing plate.
The further technical scheme is that a support is arranged on the fixed chassis, and the power device is fixed on the support.
The further technical proposal is that a liquid inlet is arranged on the upper cylinder wall of the cylindrical rice container.
An experimental method for dynamic adsorption of viscoelastic fluid on a medium surface specifically comprises the following steps:
step 1, obtaining a light absorption intensity-concentration standard curve of a polymer;
and 5, finally, calculating the dynamic adsorption capacity of the polymer according to the real-time concentration.
The further technical scheme is that the step 1 comprises the following specific steps:
A. respectively preparing polymer solutions with different concentrations by using experimental saline;
B. weighing a certain proportion of adsorption samples and mixing the adsorption samples with polymer solutions with different concentrations respectively;
C. causing the polymer solution to fully contact the adsorbed sample;
D. centrifuging by using a centrifuge to separate an adsorption sample and a polymer solution;
E. diluting polymer solutions with different concentrations, and controlling the concentration within the range of 20-160 mg/L;
F. transferring the diluted polymer solutions with different concentrations to a cuvette, measuring the absorbance of the solution by using an ultraviolet spectrophotometer, measuring for multiple times, and calculating the respective absorbance average values of the polymer solutions with different concentrations;
G. and determining the absorption intensity-concentration standard curve of the polymer according to the absorbance of the polymer solution with different concentrations.
The further technical scheme is that the calculation formula in the step 5 is as follows:
in the formula: gamma is the adsorption capacity, which expresses the amount of the adsorption polymer per gram of the adsorption medium, mu g/g; v is the volume of the polymer solution, mL; c0Is the initial concentration of the polymer solution, mg/L; ceThe concentration of the polymer solution after adsorption equilibrium is mg/L; g is the mass of the adsorption medium, G.
The invention has the following beneficial effects: the invention solves the objective problem that the dynamic adsorption quantity of the conventional viscoelastic fluid is difficult to measure, lays a foundation for more accurately constructing a mathematical model, and provides data and method support for an oilfield polymer flooding numerical technology.
Drawings
FIG. 1 is a schematic front view of the present invention;
fig. 2 is a left side view structural diagram of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, the experimental apparatus for dynamic adsorption of viscoelastic fluid on a medium surface of the present invention comprises a fixed chassis 7, a cylindrical rice container 8 mounted on the fixed chassis 7, and a power device 4, wherein a cylindrical wall of the cylindrical rice container 8 is fixed on an upper end surface of the fixed chassis 7, a rotating shaft of the power device 4 horizontally penetrates through one end of the cylindrical rice container 8 and extends to an inner cavity of the cylindrical rice container 8, a plurality of fan blades 3 are arranged on a portion of the rotating shaft located in the cylindrical rice container 8, the rotating shaft drives the fan blades 3 to rotate along the cylindrical wall in the cylindrical rice container 8, an adsorption medium filling plate 6 is arranged in a lower cylindrical wall of the cylindrical rice container 8, a solution absorbance detection device 2 is arranged on an end surface of the cylindrical rice container 8, the solution absorbance detection device 2 is located near the adsorption medium filling plate 6, the fixed chassis 7 is provided with a bracket 5, the power device 4 is fixed on the bracket 5, and the upper cylinder wall of the cylindrical rice container 8 is provided with a liquid inlet 1.
The workflow of this embodiment is as follows: preparing a medicine with a target concentration, and placing the medicine in the cylindrical rice container 8; secondly, filling the target adsorption medium on the adsorption medium filling plate 6; adjusting variable frequency drive, and designing target speed rotating fluid; fourthly, the solution absorbance detection device 2 measures the absorbance of the solution after the solution is rotationally stirred for a certain time, the concentration of the solution is determined according to the absorbance of the solution, the concentration of the fluid without stirring is compared, the loss of effective concentration is judged, and then the adsorption capacity is determined.
The above embodiment specifically includes the following steps:
step 1, preparing polymer solutions with different concentrations by using experimental saline water respectively;
step 9, detecting the real-time absorbance of the polymer after rotation according to the solution absorbance detection device 2;
step 10, obtaining the real-time concentration of the polymer according to the real-time absorbance and the light absorption intensity-concentration standard curve obtained in the step 7;
step 11, calculating to obtain the dynamic adsorption capacity of the polymer according to the real-time concentration;
in the formula: Γ is the adsorption capacity, which means the amount of adsorption polymer per gram of adsorption medium, μg/g; v is the volume of the polymer solution, mL; c0Is the initial concentration of the polymer solution, mg/L; ceThe concentration of the polymer solution after adsorption equilibrium is mg/L; g is the mass of the adsorption medium, G.
The dynamic adsorption capacity of AP-P4 polymer solutions with different concentrations under different stirring speeds is tested by a dynamic adsorption experimental device, and the adsorption capacity characteristics under static conditions are compared. The experimental conditions and results are as follows:
experimental brine: experiment saline with 3000mg/L of sodium chloride, sodium chloride;
experiment temperature: 20 ℃;
experimental polymer: a hydrophobically associative polymer (AP-P4);
quartz sand: pickled quartz sand, SiO with good roundness2The content is more than 99 percent;
the specific experimental steps are as follows: respectively preparing polymer solutions with target concentrations by using experimental saline water; b, weighing quartz sand and polymer solution according to a certain proportion; c, promoting the polymer solution to fully contact with the sand sample; d, taking out a sample, and centrifuging by using a centrifugal machine to separate out a sand sample and a polymer solution; e, diluting the polymer solution, and controlling the concentration to be within the range of 20-160 mg/L; f, transferring the diluted polymer sample to a cuvette, measuring the absorbance of the solution by using an ultraviolet spectrophotometer, measuring for multiple times, and calculating an average value; and G, calculating the concentration of the polymer solution through a concentration standard curve after obtaining the absorption intensity of the solution.
Through the experimental procedure, the standard curve y of the polymer was determined to be 0.0191 x-0.3031.
The results of the experiment are shown in table 1: as the moving strength of the polymer solution increases, the adsorption capacity of the polymer on the surface of the porous medium tends to decrease. The device can determine relatively accurate dynamic adsorption characteristics.
TABLE 1 variation in the adsorption of different polymers
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (4)
1. An experimental method for the dynamic adsorption of viscoelastic fluid on the surface of a medium is characterized in that the experimental device for the dynamic adsorption of viscoelastic fluid on the surface of the medium comprises a fixed chassis (7), a cylindrical rice container (8) and a power device (4), wherein the cylindrical wall of the cylindrical rice container (8) is fixed on the upper end surface of the fixed chassis (7), a rotating shaft of the power device (4) horizontally penetrates through one end of the cylindrical rice container (8) and extends to the inner cavity of the cylindrical rice container (8), a plurality of fan blades (3) are arranged on the part of the rotating shaft, which is positioned in the cylindrical rice container (8), the rotating shaft drives the fan blades (3) to rotate along the cylindrical wall in the cylindrical rice container (8), an adsorption medium filling plate (6) is arranged in the lower cylindrical wall of the cylindrical rice container (8), a solution absorbance detection device (2) is arranged on the end face of the cylindrical rice container (8), and the solution absorbance detection device (2) is positioned near the adsorption medium filling plate (6);
the experimental method for dynamically adsorbing the viscoelastic fluid on the surface of the medium by using the experimental device comprises the following specific steps:
step 1, obtaining a light absorption intensity-concentration standard curve of a polymer;
step 2, filling adsorption medium particles in the adsorption medium filling plate (6), then injecting a polymer into the cylindrical rice container (8), and turning on the power device (4) to enable the fan blades (3) to drive the polymer to rotate in the cylindrical rice container (8);
step 3, detecting the real-time absorbance of the polymer after rotation according to the solution absorbance detection device (2);
step 4, obtaining the real-time concentration of the polymer according to the real-time absorbance and the light absorption intensity-concentration standard curve obtained in the step 1;
and 5, finally, calculating the dynamic adsorption capacity of the polymer according to the real-time concentration.
2. The experimental method for the dynamic adsorption of viscoelastic fluid on the surface of a medium as claimed in claim 1, wherein a bracket (5) is arranged on the fixed chassis (7), and the power device (4) is fixed on the bracket (5).
3. The experimental method for the dynamic adsorption of viscoelastic fluid on the surface of a medium as claimed in claim 1, wherein the upper cylindrical wall of the cylindrical rice container (8) is provided with the liquid inlet (1).
4. The method for testing the dynamic adsorption of viscoelastic fluid on the surface of a medium according to claim 1, wherein the specific steps in step 1 are as follows:
A. respectively preparing polymer solutions with different concentrations by using experimental saline;
B. weighing a certain proportion of adsorption samples and mixing the adsorption samples with polymer solutions with different concentrations respectively;
C. causing the polymer solution to fully contact the adsorbed sample;
D. centrifuging by using a centrifuge to separate an adsorption sample and a polymer solution;
E. diluting polymer solutions with different concentrations, and controlling the concentration within the range of 20-160 mg/L;
F. transferring the diluted polymer solutions with different concentrations to a cuvette, measuring the absorbance of the solution by using an ultraviolet spectrophotometer, measuring for multiple times, and calculating the respective absorbance average values of the polymer solutions with different concentrations;
G. and determining the absorption intensity-concentration standard curve of the polymer according to the absorbance of the polymer solution with different concentrations.
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