CN111650148A - Ultraviolet evaluation method for dissolution effect of asphaltene scavenger - Google Patents
Ultraviolet evaluation method for dissolution effect of asphaltene scavenger Download PDFInfo
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- CN111650148A CN111650148A CN202010572495.0A CN202010572495A CN111650148A CN 111650148 A CN111650148 A CN 111650148A CN 202010572495 A CN202010572495 A CN 202010572495A CN 111650148 A CN111650148 A CN 111650148A
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- asphaltene
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- 239000002516 radical scavenger Substances 0.000 title claims abstract description 62
- 238000004090 dissolution Methods 0.000 title claims abstract description 23
- 230000000694 effects Effects 0.000 title claims abstract description 18
- 238000011156 evaluation Methods 0.000 title claims abstract description 14
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000002835 absorbance Methods 0.000 claims abstract description 42
- 239000004576 sand Substances 0.000 claims abstract description 31
- 239000010426 asphalt Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- 239000000243 solution Substances 0.000 description 20
- 239000006004 Quartz sand Substances 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Images
Classifications
-
- 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 ultraviolet evaluation method for the dissolving effect of an asphaltene scavenger. It comprises the following steps: measuring the characteristic wavelength of the asphaltene toluene solution, measuring the absorbance of the asphaltene toluene solution with different concentrations according to the characteristic wavelength, and drawing a standard curve according to the concentration and the absorbance of the asphaltene toluene solution; mixing fine sand powder and asphaltene, adding a scavenging agent for treatment, taking an upper-layer asphaltene scavenging agent solution at different time, measuring the absorbance of the solution to bring the absorbance into the standard curve to obtain the concentration of the asphaltene in the asphaltene scavenging agent solution, obtaining the concentration change of the asphaltene dissolved by the scavenging agent in an asphalt/sand system at different time, and calculating the dissolution rate of the asphaltene in the asphalt/sand system at different time to evaluate the dissolution effect of the scavenging agent. The invention can accurately evaluate the dissolving effect of the scavenging agent on the asphaltene in a short time.
Description
Technical Field
The invention relates to an ultraviolet evaluation method for the dissolving effect of an asphaltene scavenger.
Background
Asphaltene deposition can occur as a result of changes in pressure, temperature, and fluid composition during oilfield production. The reasons for these changes are many, including primary oil recovery, injection of natural gas and carbon dioxide, as well as acidizing and mixed recovery of incompatible fluids. Throughout the production system, asphaltenes can accumulate in multiple zones, and asphaltene buildup can occur from within the formation to pumps, tubing, wellheads, safety valves, flowlines and surface facilities. The deposited asphaltene has more and more prominent influence on the aspects of blocking a reservoir and oil extraction equipment, reducing the productivity of an oil well, increasing the cost of exploitation and operation and the like, so that the removal of the asphaltene is more and more emphasized, and the removal effect of the scavenger is concerned. However, most of the existing scavenger effect evaluation is indoor evaluation, a unified evaluation method is not available, the evaluation time is different, and the evaluation effect is different from the field implementation process. Therefore, a general method for evaluating an asphaltene scavenger is required, which can measure the dissolution effect of the asphaltene scavenger after the addition of the scavenger in a short time by simulating the formation environment.
Disclosure of Invention
The invention aims to provide an ultraviolet evaluation method for the dissolving effect of an asphaltene scavenger.
The method mixes the asphaltene with the size of 100 meshes and the quartz sand particles with the size of 60 meshes according to a certain proportion to simulate the deposition phenomenon of the asphaltene in the stratum environment, and utilizes the characteristic that the absorbance of the measured substance to monochromatic light is in direct proportion to the concentration of the measured substance by using an ultraviolet spectrophotometer to more quickly and accurately evaluate the dissolving effect of the scavenger on the asphaltene.
The invention provides an ultraviolet evaluation method for the dissolving effect of an asphaltene scavenger, which comprises the following steps:
1) measuring the absorbance of the asphaltene toluene solution at different wavelengths, drawing a curve by taking the wavelength as an abscissa and the absorbance as an ordinate, and determining the wavelength with the maximum absorbance on the curve as a characteristic wavelength;
2) under the condition of characteristic wavelength, measuring the absorbance of asphaltene toluene solution with different concentrations, and drawing a standard curve by taking the concentration of the asphaltene toluene solution as an abscissa and the absorbance as an ordinate;
3) mixing fine sand powder with asphaltene to obtain an asphalt/sand system;
4) adding a scavenging agent into the asphalt/sand system for treatment, then taking an upper-layer asphaltene scavenging agent solution at different time, and measuring the absorbance of the solution;
5) substituting the absorbance measured in the step 4) into the standard curve obtained in the step 2) to obtain the concentration of the asphaltene in the asphaltene scavenger solution so as to obtain the concentration change of the asphaltene dissolved by the scavenger in the asphalt/sand system at different times, and calculating to obtain the dissolution rate of the asphaltene in the asphalt/sand system at different times so as to evaluate the dissolution effect of the scavenger.
In the above method step 1), the method for measuring the characteristic wavelength of the asphaltenes is performed according to the following steps: and measuring the absorbance of the asphaltene toluene solution at different wavelengths, drawing a curve by taking the wavelength as an abscissa and the absorbance as an ordinate, and determining the wavelength with the maximum absorbance on the curve as the characteristic wavelength of the asphaltene.
In the method for measuring the characteristic wavelength of the asphaltene, the concentration of the asphaltene toluene solution can be 30-200 mg/L; the asphaltene toluene solution is prepared by dissolving a certain mass of asphaltene in toluene, for example, 40mg/L asphaltene toluene solution is prepared by dissolving 40mg of asphaltene in 1L toluene solution;
the different wavelengths may be 880nm, 890nm, 900nm, 910nm, 920 nm.
In the step 1), the concentration of the asphaltene toluene solution with different concentrations can be 30-200 mg/L, specifically 50mg/L, 60mg/L, 70mg/L, 80mg/L, 90mg/L, 100mg/L or 50-100 mg/L; the concentration of the asphaltene toluene solution with different concentrations is gradient concentration, and the test can be carried out according to a certain concentration gradient, wherein the smaller the concentration gradient is, the more different concentrations are tested, and the more accurate the drawn standard curve is.
In the step 2), the mass ratio of the fine sand powder to the asphaltene can be 5-60: 1, and specifically 17.75: 1.
In the above method, the ratio of the mass of the bitumen/sand system to the volume of the scavenger may be 10-41mL of the total amount of the surfactant is 1mL of 1g, specifically 0.001-0.1 g, 1mL of 0.001-0.005 g, 1mL of 0.001-0.05 g, or 1mL of 0.001-0.5 g.
In the method, the particle size of the fine sand powder can be 60-100 meshes;
the particle size of the asphaltene can be 60-100 meshes.
In the above method, the particle size of the fine sand powder may be 60 mesh;
the particle size of the asphaltenes may be specifically 100 mesh.
In the step 4), the time for measuring the absorbance of the asphaltene scavenger solution may be 0 to 25 hours, and the measurement interval may be 1 hour.
The invention has the following advantages:
according to the invention, 60-100 mesh asphaltene and 60-100 mesh quartz sand are used, and compared with general indoor evaluation, the asphaltene/sand system after mixing better simulates the deposition phenomenon of asphaltene in a porous medium in a stratum environment; after the scavenging agent is added, the absorbance in the solvent at the upper layer is measured at regular time by using an ultraviolet spectrophotometer to obtain the characteristic that the absorbance of the monochromatic light of the measured substance is in direct proportion to the concentration of the measured substance, and the dissolving effect of the scavenging agent on the asphaltene can be accurately evaluated in a short time. The method is simple to operate, convenient and quick, and has certain guiding significance on the evaluation effect on the oilfield site.
Drawings
FIG. 1 is a graph showing the change in absorbance of the asphaltene scavenger in example 1 of the present invention.
FIG. 2 is a graph showing the change in the concentration of the asphaltene scavenger in example 1 of the present invention.
FIG. 3 is a graph showing the change in the dissolved mass of the asphaltene scavenger in example 1 of the present invention.
FIG. 4 is a graph showing the change in absorbance of the asphaltene scavenger in example 2 of the present invention.
FIG. 5 is a graph showing the change in the concentration of the asphaltene scavenger in example 2 of the present invention.
FIG. 6 is a graph showing the change in the dissolved mass of the asphaltene scavenger in example 2 of the present invention.
FIG. 7 is a graph showing the change in absorbance of the asphaltene scavenger in example 3 of the present invention.
FIG. 8 is a graph showing the change in the concentration of the asphaltene scavenger in example 3 of the present invention.
FIG. 9 is a graph showing the change in the dissolved mass of the asphaltene scavenger in example 3 of the present invention.
Fig. 10 is a graph showing the determination of reasonable experimental wavelengths in example 1 of the present invention.
FIG. 11 is a standard curve of an asphaltene toluene solution in example 1 of the present invention.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Examples 1,
Experimental equipment: ultraviolet spectrophotometer
Experimental solvent: asphaltene toluene solution and asphaltene scavenger with different concentrations
Experimental equipment: a plurality of 20ml test tubes, a glass cuvette, a rubber head dropper, asphaltene (heavy component of crude oil), and quartz sand
The experimental steps are as follows:
the method comprises the following steps: 40mg/L, 70mg/L and 100mg/L of asphaltene toluene solution are prepared, the absorbance of the solution at different wavelengths (880nm, 890nm, 900nm, 910nm and 920nm, as shown in FIG. 10) is measured, a curve is drawn (as shown in FIG. 11), and the wavelength with the larger absorbance is determined as the characteristic wavelength 880 nm.
Step two: after the characteristic wavelength is determined, the absorbance of the asphaltene toluene solution under different concentrations of 50mg/L, 60mg/L, 70mg/L, 80mg/L, 90mg/L and 100mg/L is measured, and an asphaltene/absorbance standard curve is drawn.
Step three: 60-mesh fine sand powder with certain mass is mixed with 100-mesh asphaltene to simulate the deposition condition of the asphaltene under the stratum condition.
Step four: adding a scavenging agent into an asphalt/sand system, and measuring the change of the absorbance of the asphaltene scavenging agent at intervals of 1 hour.
Step five: after measuring the absorbance, the concentration of asphaltenes in the solution was determined on a standard curve.
In the method, in the third step, 3g of asphalt/sand system contains 0.16g of asphaltene, and each g of asphalt corresponds to 62.5mL of scavenger, namely the ratio of the volume of the scavenger to the mass of the asphaltene is 62.5 mL/g.
An asphalt/sand system in which 2.84g of 100 mesh quartz sand was mixed with 0.16g of 60 mesh asphaltene was taken, 10mL of scavenger was added, the change in the absorbance of asphaltene in the solvent was measured at regular intervals, and the concentration of scavenger was calculated from a standard curve, the change in concentration being shown in fig. 1-3.
According to the results shown in the figures 1 to 3, the concentration of the asphaltene scavenger and the dissolution quality of the asphaltene scavenger are in a direct proportion relation with the absorbance of the asphaltene scavenger, when the dissolution time is 15 hours, the absorbance, the concentration and the dissolution quality of an asphalt/sand system tend to be stable, the dissolution quality is 0.1067g, and the dissolution rate is 67%.
Examples 2,
The method of this example is the same as that of example 1 of the present invention, except that: a3 g bitumen/sand system containing 0.16g of asphaltenes was taken and 20mL of scavenger was added (i.e., the ratio of volume of scavenger to mass of asphaltenes was 125), the change in absorbance in the asphaltene scavenger was measured periodically and the concentration of scavenger was calculated from a standard curve, the change in concentration being shown in FIGS. 4-6.
From fig. 4 to 6, it can be seen that when the dissolution time is 14 hours, the absorbance, concentration and dissolution quality of the asphalt/sand system tend to be stable, the dissolution quality is 0.125g, and the dissolution rate is 78%.
Examples 3,
The method of this example is the same as that of example 1 of the present invention, except that: taking 3g of an asphalt/sand system with an asphaltene content of 0.16g, adding 30mL of scavenger (i.e., the ratio of volume of scavenger to asphaltene mass is 187.5mL/g), periodically measuring the change in absorbance of the asphaltene scavenger, and calculating the concentration of scavenger according to a standard curve, the change in concentration being shown in FIGS. 7-9.
From fig. 7 to 9, it can be seen that when the dissolution time is 13 hours, the absorbance, concentration and dissolution quality of the asphalt/sand system tend to be changed stably, the dissolution quality is 0.14g, and the dissolution rate is 88%.
Claims (9)
1. An ultraviolet evaluation method for the dissolution effect of an asphaltene scavenger comprises the following steps:
1) under the condition of the characteristic wavelength of asphaltene, measuring the absorbance of asphaltene toluene solutions with different concentrations, and drawing a standard curve by taking the concentration of the asphaltene toluene solution as an abscissa and the absorbance as an ordinate;
2) mixing fine sand powder with asphaltene to obtain an asphalt/sand system;
3) adding a scavenging agent into the asphalt/sand system for treatment, and then taking an upper-layer asphaltene scavenging agent solution at different time to measure the absorbance of the system;
4) substituting the absorbance measured in the step 3) into the standard curve obtained in the step 1) to obtain the concentration of the asphaltene in the asphaltene scavenger solution so as to obtain the concentration change of the asphaltene dissolved by the scavenger in the asphalt/sand system at different times, and calculating to obtain the dissolution rate of the asphaltene in the asphalt/sand system at different times so as to evaluate the dissolution effect of the scavenger.
2. The method of claim 1, wherein: the method for measuring the characteristic wavelength of the asphaltene is carried out according to the following steps: and measuring the absorbance of the asphaltene toluene solution at different wavelengths, drawing a curve by taking the wavelength as an abscissa and the absorbance as an ordinate, and determining the wavelength with the maximum absorbance on the curve as the characteristic wavelength of the asphaltene.
3. The method of claim 2, wherein: in the method for measuring the characteristic wavelength of the asphaltene, the concentration of the asphaltene toluene solution is 30-200 mg/L.
4. The method according to any one of claims 1-3, wherein: in the step 1), the concentration of the asphaltene toluene solution with different concentrations is 30-200 mg/L;
the concentration of the asphaltene toluene solution with different concentrations is gradient concentration.
5. The method according to any one of claims 1-4, wherein: in the step 2), the mass ratio of the fine sand powder to the asphaltene is 5-60: 1.
6. The method according to any one of claims 1-5, wherein: the ratio of the mass of the bitumen/sand system to the volume of the scavenger is 10-4～1g：1mL。
7. The method according to any one of claims 1-6, wherein: the particle size of the fine sand powder is 60-100 meshes;
the particle size of the asphaltene is 60-100 meshes.
8. The method of claim 7, wherein: the grain diameter of the fine sand powder is 60 meshes;
the particle size of the asphaltene is 100 meshes.
9. The method according to any one of claims 1-8, wherein: in the step 3), the time for measuring the absorbance of the asphaltene scavenger solution is 0 to 25 hours, and the measurement interval is 1 hour.
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