CN102590043B - Device and method for measuring axial dispersion coefficient of methylene blue in polymer solution - Google Patents
Device and method for measuring axial dispersion coefficient of methylene blue in polymer solution Download PDFInfo
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- CN102590043B CN102590043B CN 201210015472 CN201210015472A CN102590043B CN 102590043 B CN102590043 B CN 102590043B CN 201210015472 CN201210015472 CN 201210015472 CN 201210015472 A CN201210015472 A CN 201210015472A CN 102590043 B CN102590043 B CN 102590043B
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Abstract
本发明提出一种测定亚甲基蓝在聚合物溶液中轴向弥散系数的装置及方法。所述测定亚甲基蓝在聚合物溶液中轴向弥散系数的装置包括：由玻璃形成的玻璃平板模型，所述玻璃平板模型具有内部腔道，所述内部腔道包括：入口和与入口联通的水平的直形通道，所述入口与所述驱替系统连接，直形通道的各径向截面均形状相同，面积相等。本发明还提出一种测定亚甲基蓝在聚合物溶液中轴向弥散系数的方法，所述方法包括：a、在水平的直形通道内进行驱替测试，所述直形通道的侧壁由玻璃形成；b、在直形通道上设置观测点，拍照观测点处的溶液颜色进行图像采集得到彩图；c、将拍照得到的观测点处的溶液颜色彩图转换成灰度图；d、将灰度转化为浓度。
The invention provides a device and method for measuring the axial diffusion coefficient of methylene blue in a polymer solution. The device for measuring the axial diffusion coefficient of methylene blue in a polymer solution includes: a glass plate model formed of glass, the glass plate model has an internal cavity, and the internal cavity includes: an inlet and a level of communication with the inlet In a straight channel, the inlet is connected to the displacement system, and each radial section of the straight channel has the same shape and equal area. The present invention also proposes a method for measuring the axial diffusion coefficient of methylene blue in a polymer solution, the method comprising: a, carrying out a displacement test in a horizontal straight channel, the side wall of the straight channel is formed by glass ; B, set the observation point on the straight channel, take pictures of the solution color at the observation point for image acquisition to obtain a color map; c, convert the color map of the solution color at the observation point obtained by taking pictures into a grayscale image; d, convert the gray converted to concentration.
Description
Technical field
The present invention relates to reservoir engineering, belong to a kind of device and method of measuring methylene blue axial dispersion coefficient in polymer solution, explaining for well-to-well tracer test in the polymer flooding specifically provides reasonably axially dispersion coefficient.
Background technology
Some Domestic main force oil reservoir has been carried out large-scale Polymer flooding experiment at present, and the description that the oil reservoir dynamic change after poly-the driving, nonuniformity dynamic change are badly in need of comparatively accurately, are quantized is for the raising recovery efficiency technique after poly-the driving provides the basis.Wherein, one of topmost research direction is to the dynamic understanding of heterogeneous body, displacement situation, residual production potential and key character parameter between well, in the interlayer, layer, this poly-driving attitude problem need to solve by the inter-well test technology, and development scheme behind the polymer flooding and exploitation adjustment are had important value and significance.
From rig-site utilization, can completed well between the method for quantification monitoring function be mainly tracing method between well, monitoring and the Explanation Accuracy of this technology in the water drive process is higher, technology is comparatively ripe.
But along with mining site is used and promoted, and there is following limitation aspect the tracer monitoring behind polymer flooding and the interpretation technique:
(1) polymer solution or residual polyalcohol and seepage flow characteristics thereof are not described targetedly on the impact of tracer agent microscopic seepage
Because in the reservoir of porous medium, seepage flow characteristics and the water of polymer solution or residual polyalcohol are variant, exist macroscopic view to involve the impact of scope and microcosmic stagnant pore, the reliability that this seepage flow characteristics can improve explanation results is described.Therefore, how the behavioral characteristics after poly-the driving being reflected between well in the tracer flow interpretation model, is one of target of research.
(2) the axial dispersion coefficient that uses during tracer agent is explained in the polymer flooding process or behind the polymer flooding is continued to use the empirical value of water drive, has larger blindness.
Tracer agent mining site monitoring after Daqing oil field has been carried out polymer flooding and driven, its interpretation technique is still used the tracer agent interpretation technique of water drive process, only some parameter is done certain correction.Still do not explain for tracer monitoring between polymer flooding, follow-up water drive well specially at present and carry out particular study work, the research work of explaining for tracer monitoring in the water drive process is only arranged.And present tracer agent seepage flow characteristics is described principle and the theory that still proposes based on 20th century 60 to the eighties, there is not corresponding development and improvement, through domestic some mining site practices and theoretical contrast proof, there are significant limitation in these basic theories and the interpretation model of setting up on this basis, Consideration is too unilateral or idealized, can not fine adaptation polymer flooding or follow-up water drive process in the quantitative description requirement of complicated percolation.
Axially dispersion coefficient is the key parameter in the tracer test interpretation technique, and its value directly has influence on the rationality of explanation results.Disperse refers in the porous medium liquid flow, the two kinds of easy generation of the transitional zone between liquid and phenomenons of development of mixing that composition is different.Dispersion theory is qualitative description and the various easily mixed liquid of quantitative evaluation theory of the habit of trans-substitution mutually in porous medium.Axially dispersion coefficient mainly is subject to the impact of Flow Field Distribution, polymer solution is a kind of typical non-Newtonian fluid, its Flow Field Distribution and Newtonian fluid under the equal conditions in flow media has very large difference, so tracer agent axial dispersion coefficient and its axial dispersion coefficient in Newtonian fluid therein also has very big difference.
The method of the axial dispersion coefficient of measurement of existing routine all is to utilize core block as model, make the tracer agent displacing fluid penetrate such porous medium, measure the production curve of tracer agent in the one dimension rock core, by the match to production curve, the counter coefficient of diffusion of asking tracer agent.But the porous medium pore throat rank nonuniformity such owing to rock core is very strong, when polymkeric substance passes through rock core, caused very large shearing, endpiece polymer viscosity and entrance point differ greatly, be difficult to guarantee the stable of Polymer Solution Property, therefore, the axial dispersion coefficient reliability that measures with the method is very poor.Particularly for methylene blue (tracer agent commonly used), its adsorbance in rock core is very large, and the concentration of the endpiece that obtains in test process is very little, is difficult to satisfy reference axis to the requirement of dispersion coefficient.On the other hand, because the barrier effect of the skeleton of rock, caused horizontal disperse to a certain extent, obtain axial dispersion coefficient by the inverting production curve and comprised horizontal disperse and axial dispersion coefficient two parts, and for the individual reservoir tracer test, transverse dispersion can be ignored substantially, and axial diffusion is the major control factor that affects the tracer agent migration.
In addition, when utilizing rock core as the concentration of model measurement tracer agent, need to detect the concentration that core profile concentration obtains the tracer agent of test point by dynamic displacement test, the difficulty that detects core profile concentration is large, complicated operation, and error is also large.
Summary of the invention
The object of the present invention is to provide the device and method of a kind of definite methylene blue axial dispersion coefficient in polymer solution, to solve laterally disperse in the one dimension rock core, polymkeric substance is sheared serious, methylene blue adsorption number seriously causes production curve to be difficult to obtain and the problem such as inverting distortion, thereby can study under the particular polymers concentration conditions, the axial dispersion coefficient of the methylene blue under the specific flow conditions is for tracer test explanation after reaching polymer flooding in the polymer flooding process provides strong technical basis.
It is large that the present invention also will solve the difficulty that detects core profile concentration, complicated operation, and the time is long, and error is large problem also.
For this reason, the present invention proposes a kind of device of measuring methylene blue axial dispersion coefficient in polymer solution, and the device of described mensuration methylene blue axial dispersion coefficient in polymer solution comprises: the displacement system of displacement polymer solution,
Described mensuration methylene blue in polymer solution axially the device of dispersion coefficient also comprise: the glass plate model that is formed by glass, described glass plate model has inner cavity, described inner cavity comprises: entrance and with the straight shape passage of the level of entrance UNICOM, described entrance is connected with described displacement system, the equal shape of each radial section of straight shape passage is identical, and area equates;
The concentration determination system is arranged on outside the described glass plate model, tests the solution at the observation station place in the straight shape passage.
Further, described inner cavity comprises: the cuboid passage of level and the cross section that is connected with described cuboid passage are the unhurried current groove (77) of rectangle, described unhurried current groove (77) is connected with the entrance of described inner cavity, and the degree of depth of described unhurried current groove (77) is greater than the height of described cuboid passage.
Further, described glass plate model comprises: top surface of the glass dull and stereotyped (71), bottom surface glass plate (72), intermediate glass dull and stereotyped (73) and end face glass plate (74), the identical and concordant rectangular parallelepiped of formation lateral surface that is parallel to each other of above-mentioned four glass plate thickness; Bottom surface glass plate (72) is rectangle with top surface of the glass dull and stereotyped (71) and is big or small identical, and intermediate glass dull and stereotyped (73) is shorter than top surface of the glass flat board (71) in the longitudinal direction; Dull and stereotyped (73) width of top surface of the glass dull and stereotyped (71), bottom surface glass plate (72) and intermediate glass is identical and equal the length of end face glass plate (74), and the length of top surface of the glass dull and stereotyped (71) is greater than the length of intermediate glass flat board (73) and the width sum of end face glass plate (74);
End face glass plate (74) is fitted on the bottom surface glass plate (72), align and be sealing adhesive with glass cement at the first end of bottom surface glass plate (72) with bottom surface glass plate (72), so that, form unhurried current groove (77) between end face glass plate (74) and the intermediate glass dull and stereotyped (73), top surface of the glass dull and stereotyped (71) is positioned at end face glass plate (74) and dull and stereotyped (73) top of intermediate glass, with fluid sealant top surface of the glass dull and stereotyped (71) is sealing adhesive with end face glass plate (74), and the be sealing adhesive two ends of sealing unhurried current groove and the side of intermediate glass dull and stereotyped (73);
Intermediate glass dull and stereotyped (73) is fitted in bottom surface glass plate (72) upward and intermediate glass dull and stereotyped (73) aligns with second end of bottom surface glass plate (72) at bottom surface glass plate (72), form the slit between intermediate glass dull and stereotyped (73) and the top surface of the glass dull and stereotyped (71), this slit is described craspedodrome passage, and intermediate glass dull and stereotyped (73) is sealed is bonded between bottom surface glass plate (72) and the top surface of the glass flat board (71);
Offer filling orifice (76) at unhurried current top surface of the glass plate corresponding to groove centre position, described filling orifice (76) is communicated with the groove that flows slowly, and described filling orifice (76) is connected with described displacement system by pipeline.
Further, top surface of the glass dull and stereotyped (71) is of a size of with bottom surface glass plate (72): long 10cm, wide 5cm, high 0.2cm; Intermediate glass dull and stereotyped (73) is of a size of long 8cm, wide 5cm, high 0.2cm, the unhurried current groove is of a size of: long 3.6cm, wide 1cm, high 0.3cm, the height distance of maintenance 0.1cm between intermediate glass dull and stereotyped (73) and the top surface of the glass dull and stereotyped (71).
Further, described concentration determination system comprises: luminous platform and data acquisition system (DAS), luminous platform comprises: light source (12) and be positioned at light source (12) top passive light-passing board (7), and glass plate model (8) is arranged on this light-passing board (7); Data acquisition system (DAS) comprises: Stereo microscope (9), image collecting device (2), image display system (1) and data analysis system, Stereo microscope is supported on glass plate model top by support (3), described image collecting device (2) is connected with Stereo microscope, the solution colour coloured picture at the observation station of taking pictures place, described image display system (1) is connected with described image collecting device (2), the solution colour coloured picture at the observation station place that obtains taking pictures converts gray-scale map to, described data analysis system is connected with described image display system (1), and gray scale is converted into concentration.
Further, described displacement system comprises: micro pump and the intermediate receptacle group that is connected with micro pump, described intermediate receptacle group comprises: the first intermediate receptacle (4), the second intermediate receptacle (5) and the 3rd intermediate receptacle (6), three described intermediate receptacle one ends are parallel-connected to the entrance of described inner cavity, and the other end of three intermediate receptacles is parallel-connected on the described micro pump.
The present invention also proposes a kind of method of measuring methylene blue axial dispersion coefficient in polymer solution, and described method comprises:
A, carry out displacement test in the straight shape passage of level, the sidewall of described straight shape passage is formed by glass;
B, at straight shape passage observation station is set, carries out image acquisition and obtain coloured picture with the camera solution colour at observation station place of taking pictures in the displacement process;
The solution colour coloured picture at c, the observation station place that obtains of will taking pictures converts gray-scale map to;
D, gray scale is converted into concentration.
Further, the unhurried current groove is set, the degree of depth of described unhurried current groove is greater than described straight shape passage, one end of straight shape passage is for flowing into end, this flows into end and is communicated with the unhurried current groove, the other end of straight shape passage is outflow end, and the chute of postponing arranges 15 to 20 observation stations to the outflow end of straight shape passage is equidistant, and the displacement process to each observation station under the time interval of setting carries out image acquisition.
Further, setting-up time is spaced apart 60 seconds, and described polymkeric substance is Polymer Used For Oil Displacement.
Further, the method is used the device of foregoing mensuration methylene blue axial dispersion coefficient in polymer solution, and the method specifically may further comprise the steps:
(1) compound concentration is the polymer solution of 1000～2000mg/L;
(2) described polymer solution is divided into two parts, portion is directly put into the first intermediate receptacle (4), after another part adding methylene blue is mixed with the polymer solution that contains 0.5g/L～1g/L methylene blue, put into the second intermediate receptacle (5) as the tracer agent displacing fluid;
(3) start micro pump, make polymer solution in the first intermediate receptacle slowly flow into the unhurried current groove of glass plate model by filling orifice (7-6), then parallel inflow slit, after the polymer solution that does not contain methylene blue is full of the glass plate model, stop injection of polymer solution in the first intermediate receptacle;
(4) start micro pump and drive and contain the methylene blue polymer solution in the second intermediate receptacle, make the tracer agent displacing fluid by the gentle chute of filling orifice, the polymer solution that does not contain methylene blue in the displacement glass plate Model slot; Displacing velocity remains stable;
(5) leading displacement edge under the effect of tracer agent displacing fluid along the axial advance of straight shape passage, the chute of postponing arranges 15 to 20 observation stations to the second end is equidistant, image capturing system displacement process to each observation station under the time interval of setting carries out image acquisition, after leading displacement edge is advanced to straight shape passage outflow, close micro pump, stop displacement;
(6) pass through image capturing system, the methylene blue concentration that obtains each observation station is curve over time, analysis obtains average migration time and the migration time variance of every curve, bring in the formula (d), curve plotting, rate of curve is exactly the axial dispersion coefficient of methylene blue in polymer solution under the 0.5g/L concentration, and described formula (d) is:
Wherein, D---axial dispersion coefficient, t---average migration time, u---displacing velocity, Δ t
2---time variance is passed through in migration.
(7) after measurement was finished, the startup micro pump drove the distilled water in the 3rd intermediate receptacle, cleans the glass plate model, prepared next time test.
The present invention has adopted the straight shape passage of the level that is formed by glass to carry out the displacement test, there is not the problem of the horizontal disperse that the rock core of many hollow structures that prior art uses has in this straight shape passage, the axial dispersion coefficient that obtains by the present invention no longer comprises the impact of horizontal disperse, thereby more accurate.
And then the present invention obtains the mode of concentration by gray scale, adopts the optical mode such as take pictures just to obtain the concentration of test point, efficient is high, analysis time is short, and it is large also to have avoided prior art to detect the difficulty that the mode of core profile concentration brings to rock core, complicated operation, error be large problem also.
In addition, the present invention obtains methylene blue under the glass model axial dispersion coefficient in polymer solution, can further provide fundamental basis for using glass model to carry out displacement test, for the widespread use of glass model provides underlying parameter.
Description of drawings
Fig. 1 is the process flow diagram synoptic diagram according to measurement methylene blue axial dispersion coefficient device in polymer solution of the embodiment of the invention;
Fig. 2 is according to the whole plan structure of the glass plate model of the embodiment of the invention;
Fig. 3 is the A-A view of glass plate model among Fig. 2;
Fig. 4 is the B-B view of glass plate model among Fig. 2;
Fig. 5 is different observation station methylene blue solution concentration and the time curve according to the embodiment of the invention;
Fig. 6 shows the principle of asking for of dispersion coefficient.
The drawing reference numeral explanation:
1. image display system; 2. image collecting device; 3. support; 4. the first intermediate receptacle; 5. the second intermediate receptacle; 6. the 3rd intermediate receptacle; 7. light-passing board; 8. glass plate model; 9. Stereo microscope; 10. the first six-way valve; 11. connect the sample device; 12. light source; 13. stabilized voltage supply; 14. the second six-way valve; 15. micro pump; 70. straight shape passage 71. top surface of the glass are dull and stereotyped; 72. bottom surface glass plate; 73. intermediate glass is dull and stereotyped; 74. end face glass plate; 75. glass cement; 76. filling orifice; 77. unhurried current groove; 78. bolt
Embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast description of drawings the specific embodiment of the present invention.
As shown in Figure 1, according to the mensuration methylene blue of the embodiment of the invention in polymer solution axially the device of dispersion coefficient comprise: the displacement system of displacement polymer solution, the glass plate model 8 and the concentration determination system that are formed by glass.
The displacement system comprises micro pump 15 and the second six-way valve 14.Extremely shown in Figure 4 such as Fig. 2, described glass plate model 9 has inner cavity, described inner cavity comprises: entrance and with the straight shape passage 70 of the level of entrance UNICOM, described entrance is connected with described displacement system, the equal shape of each radial section of straight shape passage is identical, area equates that each radial section overlaps in the axial direction projection, so that polymer solution can be in displacement process, along axially (being length direction) craspedodrome, avoid horizontal disperse, in addition, this straight shape passage is hollow, this is different from the porous structure of rock core, thereby can not be adsorbed, can not sheared by rock core, what obtain is desirable axial dispersion coefficient.
The concentration determination system is arranged on outside the described glass plate model 8, tests the solution at the observation station place in the straight shape passage, namely tests observation station and is in the displacement process, contains the concentration of leading displacement edge of the polymer solution of methylene blue.The present invention adopts the gray scale method of testing to test the solution concentration at the observation station place in the straight shape passage.
Further, extremely shown in Figure 4 such as Fig. 2, described inner cavity comprises: the cuboid passage of level and the cross section that is connected with described cuboid passage are the unhurried current groove 77 of rectangle, described unhurried current groove 77 is connected with the entrance of described inner cavity, the bottom surface of described unhurried current groove 77 is lower than the bottom surface of cuboid passage, the end face of described unhurried current groove 77 is concordant with the end face of cuboid passage, the degree of depth of described unhurried current groove 77 is greater than the height of described cuboid passage, and the width of unhurried current groove 77 equals the width of described cuboid passage.The effect of unhurried current groove can allow uniform liquid advance, can try one's best so that filling liquid in carrying out the axia flow process, streamlined is the horizontal line propelling, avoids the irregular channelling of filling liquid.The cuboid passage is on each short transverse, and the flow of liquid equates, can not produce up and down flowing between the liquid level, and the end face of passage and bottom surface can shearing test liquid yet, reduced horizontal disperse, improved measuring accuracy.In the experiment, fluid at first flows in the unhurried current groove through filling orifice, when holding full injection liquid in the groove to be flow slowly, carries out axia flow by the space between intermediate glass plates and the top surface of the glass plate along longest edge.
Further, extremely shown in Figure 4 such as Fig. 2, glass plate model 8 comprises top surface of the glass flat board 71, bottom surface glass plate 72, intermediate glass dull and stereotyped 73 and end face glass plate 74, four glass plate thickness are identical, wherein, bottom surface glass plate 72 is rectangle with top surface of the glass flat board 71 and is big or small identical, intermediate glass flat board 73 is shorter than top surface of the glass dull and stereotyped 71 and bottom surface glass plate 72 in the longitudinal direction, three glass plate width are identical and equal the length of end face glass plate 74, the length of top surface of the glass flat board 71 is greater than the length of intermediate glass flat board 73 and the width sum of end face glass plate 74, intermediate glass dull and stereotyped 73 alignd with bottom surface glass plate 72 second ends be sealing adhesive with glass cement 75, end face glass plate 74 and bottom surface glass plate 72 align at first end, be sealing adhesive with glass cement, make and form unhurried current groove 77 between end face glass plate 74 and the intermediate glass flat board 73, top surface of the glass flat board 71 is positioned at end face glass plate 74 and dull and stereotyped 73 tops of intermediate glass, with fluid sealant top surface of the glass dull and stereotyped 71 and end face glass plate 74 are sealing adhesive, and, the two ends of sealing unhurried current groove and the side of intermediate glass flat board 73, and with bolt 78 model is fixed, the height that keeps 0.1cm between intermediate glass dull and stereotyped 73 and the top surface of the glass flat board 71, form the slit, described unhurried current groove communicates with described slit, at unhurried current top surface of the glass plate corresponding to the groove center filling orifice 76 that to open a diameter be 0.5cm, described filling orifice 76 is connected by the outlet of pipeline with the first six-way valve 10; Described glass plate is quartz glass.Described filling orifice 76 is connected with described displacement system by pipeline.
Described glass plate is quartz glass.Use above-mentioned glass plate to make the straight shape passage that the glass plate model can formation rule, form airtight displacement space, be convenient to levelling, be convenient to the gentle chute of the straight shape passage of manufacture, and simple in structure.
Further, top surface of the glass dull and stereotyped 71 and bottom surface glass plate 72 are of a size of: long 10cm, wide 5cm, high 0.2cm; Intermediate glass flat board 73 is of a size of long 8cm, wide 5cm, high 0.2cm, and the unhurried current groove is of a size of: long 3.6cm, wide 1cm, high 0.3cm, the height distance of maintenance 0.1cm between intermediate glass dull and stereotyped 73 and the top surface of the glass flat board 71.Such dimensional structure and ratio can cooperate in the less situation of displacing velocity, and frontal movement speed is that 0.1mm/s is to 1mm/s, so that test result is not affected by displacing velocity substantially.
Make the degree of depth of unhurried current groove reach more than 3 times of straight shape passage, fully guaranteed the effect that uniform liquid advances.
Further, as shown in Figure 1, described concentration determination system comprises: luminous platform and data acquisition system (DAS), and luminous platform comprises: light source 12 and be positioned at the passive light-passing board 7 in light source 12 tops, glass plate model 8 is arranged on this light-passing board 7; Data acquisition system (DAS) comprises: Stereo microscope 9, image collecting device 2, image display system 1 and data analysis system, Stereo microscope is supported on glass plate model top by support 3, model is stereomicroscope SZX16, microscope interfaces is 0.7X C type, described image collecting device 2 is connected with Stereo microscope, the solution colour coloured picture at the observation station of taking pictures place, for example, adopt digital camera to take pictures, also can adopt camera to take pictures, capture card can be Data Acquisition Card Intel 8390, described image display system 1 is connected with described image collecting device 2, and the solution colour coloured picture at the observation station place that obtains taking pictures converts gray-scale map to, and described data analysis system is analyzed by computer, computer is connected with described image display system 1, and gray scale is converted into concentration.The model of above-mentioned parts is stereomicroscope SZX16, microscope interfaces is the 0.7XC type, digital camera is the digital digital camera of 30 frame/seconds more than 1024, capture card can be Data Acquisition Card Intel 8390, camera can be the EOS 40D of Canon, and computer adopts microcosmic displacement image analysis system software (WGQT).
The present invention adopts the mode that gray scale is converted into concentration, uses shooting style by being converted to concentration, has avoided the complicated and inconvenient of test chemical, can realize not being subjected to time restriction, repeatedly with the test of multiple spot.Wherein, obtain first coloured picture, coloured picture is based on the blue three primary colours of reddish yellow, provide the image of a test point with three parameters, but computer is not easy to identify at present, and for the identification of computer, image display system is converted into these three parameters again the image of the gray scale that only has a parameter of computer identification, different gray scales is corresponding different concentration then, can be determined by Experimental Calibration about the corresponding relation of gray scale and concentration.For example, methylene blue solution concentration calibration process: dilute methylene blue with polymer solution, configuration obtains the methylene blue solution of some parts of variable concentrations, get the methylene blue solution coloured picture of variable concentrations, convert this coloured picture to gray-scale map, and calculate average gray value, and namely obtain the methylene blue solution variable concentrations---the gray-scale value relation curve.Obtain relation function between concentration and the gray scale by match, like this, if known certain any gray scale can inverting obtain this methylene blue solution concentration by above-mentioned relation.As for the mode that is converted into concentration by gray scale, be prior art, can use for reference the related art scheme of prior art.
In addition; the present invention adopts glass model, and on the one hand, glass model is corrosion-resistant; be applicable in the oil reservoir displacement test; on the other hand, the glass printing opacity adopts glass model can cooperate camera to take pictures; adopt the method for optic test to obtain test concentrations; can as the method for general chemistry analysis, need to not test once and will suspend or stop test process, so glass model of the present invention can to impacting continuously of testing, not saved the test duration.
Further, as shown in Figure 1, described displacement system comprises: micro pump and the intermediate receptacle group that is connected with micro pump, described intermediate receptacle group comprises: the first intermediate receptacle 4, the second intermediate receptacle 5 and the 3rd intermediate receptacle 6, three described intermediate receptacle one ends are parallel-connected to the entrance of described inner cavity, and the other end of three intermediate receptacles is parallel-connected on the described micro pump.The first intermediate receptacle 4 is equipped with the polymer solution that does not contain methylene blue, the second intermediate receptacle 5 is equipped with the polymer solution that contains methylene blue, the 3rd intermediate receptacle 6 is equipped with distilled water, three intermediate receptacles are parallel-connected to the entrance of the first six-way valve 10 downwards, upwards are connected to the outlet of the second six-way valve 14;
Like this, can realize fast that the liquid in each container enters rapidly glass model, can realize the replacement of the liquid in each container, be convenient to recycling, repeatedly test.
The present invention also proposes a kind of method of measuring methylene blue axial dispersion coefficient in polymer solution, and described method comprises:
A, carry out displacement test in the straight shape passage of level, the sidewall of described straight shape passage is glass;
B, at straight shape passage observation station is set, the solution colour at the observation station of taking pictures place carries out image acquisition and obtains coloured picture;
The solution colour coloured picture at c, the observation station place that obtains of will taking pictures converts gray-scale map to;
D, gray scale is converted into concentration.
Further, the unhurried current groove is set, the degree of depth of described unhurried current groove is greater than described straight shape passage, one end of straight shape passage is for flowing into end, this flows into to hold with the unhurried current groove and is communicated with, and the other end of straight shape passage is outflow end, and polymer solution flows out glass model from outflow end, postpone chute to equidistant 15 to 20 observation stations (test point) that arrange of the outflow end of straight shape passage, and the displacement process to each observation station under the time interval of setting carries out image acquisition.Can use a camera or a camera to be taken up in order of priority each observation station of taking pictures, also can use a plurality of cameras or a plurality of camera each observation station of taking pictures simultaneously respectively.
By along journey 15～20 observation stations (test point) being set at glass model, obtain 15～20 concentration curves in the displacement process, analyze the average migration time and the migration time variance that obtain every curve, by drawing migration time variance and 2D/u
2Relation curve obtains rate of curve, and rate of curve is exactly the axial dispersed system numerical value of methylene blue in polymer solution under this concentration, and the method has been avoided one or several observation station concentration curves to obtain failure and caused the situation that can't calculate dispersion coefficient.This dispersion coefficient is the mean value that 15～20 observation stations are calculated dispersion coefficients, and this dispersion coefficient more can react the macrodispersion degree in displacement process, and the dispersion coefficient that Hypothesis of Single Curve Build Up tries to achieve is more convincing than obtaining.
And the mode of existing detection core profile concentration, if carry out the detection of core profile concentration of the middle multiple spot of rock core model, then there is very large trouble, the one, be difficult to know whether leading displacement edge arrives this centre each point, and namely whether this centre each point is in the displacement process, the 2nd, if the concentration of profile of certain point in the middle of having tested, then need to stop displacement, if the concentration of profile of any under the test then needs to restart, lose time.No matter the present invention is to adopt multi-point sampler, or the reference position of a test channel, all need not to stop to test the concentration that just can obtain test point, do not affect the follow-up test of other test points, save time, especially for multi-point sampler, more can keep testing continuously, more can save time.
Further, setting-up time is spaced apart 60 seconds, like this, can access more data.Described polymkeric substance is Polymer Used For Oil Displacement.
Further, the method is used the device of foregoing mensuration methylene blue axial dispersion coefficient in polymer solution, and the method specifically may further comprise the steps:
(1) compound concentration is the polymer solution of 1000～2000mg/L;
(2) described polymer solution is divided into two parts, portion is directly put into the first intermediate receptacle 4, another part add methylene blue be mixed with contain 0.5g/L～1g/L methylene blue polymer solution for example, behind the polymer solution of the methylene blue of employing 0.5g/L, put into the second intermediate receptacle 5 as the tracer agent displacing fluid;
(3) start micro pump, make polymer solution in the first intermediate receptacle slowly flow into the unhurried current groove of glass plate model by filling orifice 7-6, then parallel inflow slit, after the polymer solution that does not contain methylene blue is full of the glass plate model, stop injection of polymer solution in the first intermediate receptacle;
(4) start micro pump and drive and contain the methylene blue polymer solution in the second intermediate receptacle, make the tracer agent displacing fluid by the gentle chute of filling orifice, the polymer solution that does not contain methylene blue in the displacement glass plate Model slot; Displacing velocity remains stable;
(5) leading displacement edge under the effect of tracer agent displacing fluid along the axial advance of straight shape passage, the chute of postponing arranges 15 to 20 observation stations to the second end is equidistant, image capturing system displacement process to each observation station under the time interval of setting carries out image acquisition, after leading displacement edge is advanced to straight shape passage outflow, close micro pump, stop displacement.
(6) pass through image capturing system, the methylene blue concentration that obtains each observation station is curve over time, analysis obtains average migration time and the migration time variance of every curve, bring in the formula (d), curve plotting, rate of curve is exactly the axial dispersion coefficient of methylene blue in polymer solution under the 0.5g/L concentration, and described formula (d) is:
Wherein, D---axial dispersion coefficient, t---average migration time, u---displacing velocity, Δ t---time variance is passed through in migration.
(7) after measurement was finished, the startup micro pump drove the distilled water in the 3rd intermediate receptacle, cleans the glass plate model, prepared next time test.
(embodiment 1) measures concentration is that the methylene blue of 0.5g/L is axial dispersion coefficient in the polymer solution of 1000mg/L in concentration.
(1) preparation partially hydrolyzed polyacrylamide concentration is the polymer solution 200mL of 1000mg/L.
(2) described polymer solution is divided into two parts, portion is directly put into the first intermediate receptacle 4, after another part adding methylene blue is mixed with the polymer solution that contains the 0.5g/L methylene blue, puts into the second intermediate receptacle 5;
(3) adjust the first six-way valve 10 and the second six-way valve 14, start micro pump, make polymer solution in the first intermediate receptacle slowly flow into the unhurried current groove of glass plate model by filling orifice 7-6, then parallel inflow slit, after the polymer solution that does not contain methylene blue is full of the glass plate model, valve-off;
(4) adjust the first six-way valve 10 and the second six-way valve 14, and the startup micro pump drives the polymer solution in the second intermediate receptacle, make the polymer solution that contains methylene blue by the gentle chute of filling orifice, the polymer solution that does not contain methylene blue in the displacement glass plate Model slot; Displacing velocity is 0.5cm/s; The polymer solution inflow that does not contain methylene blue that is gone out by displacement connects sample device 11;
(5) leading displacement edge under the effect of tracer agent displacing fluid along the model axial advance, the chute of postponing arranges 15 observation stations to straight shape passage outflow end is equidistant, image capturing system displacement process to each observation station under the time interval of setting carries out image acquisition, after leading displacement edge is advanced to model endpiece (straight shape passage outflow end), close micro pump, stop displacement;
(6) pass through image capturing system, the methylene blue concentration that obtains each observation station is curve (Fig. 5) over time, analysis obtains average migration time and the migration time variance of every curve, bring in the formula (d), curve plotting (Fig. 6), rate of curve is exactly the axial dispersion coefficient of methylene blue in polymer solution under the 0.5g/L concentration, and described formula (d) is:
Wherein, D---axial dispersion coefficient, t---average migration time, u---displacing velocity, Δ t
2(---time variance is passed through in migration.
The axial dispersion coefficient D of methylene blue in polymer solution that calculates under the 0.5g/L concentration is 0.0142cm
2/ s, namely among Fig. 6, slope y=0.0142, R
2=0.9814 (precision of expression match).
(7) measure finish after, adjust the first six-way valve 10 and the second six-way valve 14, and start micro pump and drive distilled water in the 3rd intermediate receptacle, clean the glass plate model, cleaning up rear glass plate model can reuse.
Wherein, the setting-up time interval is preferably 60 seconds.The number of described observation station is preferably 15.Described polymkeric substance is Polymer Used For Oil Displacement.For example for the displacement of reservoir oil with water-soluble hydrophobic associated polymer AP-P4, partially hydrolyzed polyacrylamide.(embodiment 2) measure concentration is that the methylene blue of 0.5g/L is axial dispersion coefficient in the polymer solution of 2000mg/L in concentration.
Prepared polymer concentration is polymkeric substance (partially hydrolyzed polyacrylamide) the solution 200mL of 2000mg/L.Adopt the step identical such as embodiment 1, the methylene blue that measures 0.5g/L is that axial dispersion coefficient in the polymer solution of 2000mg/L is 0.0357cm in concentration
2/ s.
(embodiment 3) measure concentration is that the methylene blue of 0.5g/L is axial dispersion coefficient in the partially hydrolyzed polyacrylamide polymer solution of 1500mg/L in concentration.
Preparation partially hydrolyzed polyacrylamide concentration is the polymer solution 200mL of 1500mg/L.Adopt the step identical such as embodiment 1, the methylene blue that measures 0.5g/L is that axial dispersion coefficient in the partially hydrolyzed polyacrylamide polymer solution of 1500mg/L is 0.0245cm in concentration
2/ s.
(embodiment 4) measure concentration is that the methylene blue of 1g/L is axial dispersion coefficient in the partially hydrolyzed polyacrylamide polymer solution of 1000mg/L in concentration.
Preparation partially hydrolyzed polyacrylamide concentration is the polymer solution 200mL of 1000mg/L.Adopt the step identical such as embodiment 1, the methylene blue that measures 1g/L is that axial dispersion coefficient in the polymer solution of 1000mg/L is 0.0215cm in concentration
2/ s.
The present invention utilizes the dispersion coefficient of parallel glass model measurement methylene blue in polymer solution, method is easy, glass model is easy to make, expense is low, and can reuse, the dispersion coefficient that measures provides powerful support for for using methylene blue to provide as the tracer test quantitative description of tracer agent in the polymer flooding.
The above only is the schematic embodiment of the present invention, is not to limit scope of the present invention.For each ingredient of the present invention can make up under the condition of not conflicting mutually, any those skilled in the art, the equivalent variations of having done under the prerequisite that does not break away from design of the present invention and principle and modification all should belong to the scope of protection of the invention.
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| CN108918388A (en) * | 2018-07-18 | 2018-11-30 | 武汉大学 | Aquifer solute dispersion coefficient and hole rate determination method |
| CN109612994B (en) * | 2018-11-30 | 2022-02-15 | 福建中烟工业有限责任公司 | Image capture and detection device and method for the absorption performance of reconstituted tobacco leaves to coating liquid |
| CN110346247B (en) * | 2019-07-29 | 2021-04-06 | 河海大学 | A mesoscale test method for the determination of the salt diffusion coefficient of the sediment in the reclamation area |
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| CN1996010A (en) * | 2006-01-06 | 2007-07-11 | 中国石油天然气股份有限公司 | Method for manufacturing visual pore-level planar model |
| CN101363822A (en) * | 2007-08-10 | 2009-02-11 | 中国石油天然气股份有限公司 | Transparent parallel plate device for researching viscous fingering of fracture acidizing fluid |
| CN102261468A (en) * | 2010-05-27 | 2011-11-30 | 中国石油天然气股份有限公司 | Glass model sealing method |
| CN202421022U (en) * | 2012-01-18 | 2012-09-05 | 中国石油大学(北京) | Device for determining axial dispersion coefficient of methylene blue in polymer solution |
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| CN1996010A (en) * | 2006-01-06 | 2007-07-11 | 中国石油天然气股份有限公司 | Method for manufacturing visual pore-level planar model |
| CN101363822A (en) * | 2007-08-10 | 2009-02-11 | 中国石油天然气股份有限公司 | Transparent parallel plate device for researching viscous fingering of fracture acidizing fluid |
| CN102261468A (en) * | 2010-05-27 | 2011-11-30 | 中国石油天然气股份有限公司 | Glass model sealing method |
| CN202421022U (en) * | 2012-01-18 | 2012-09-05 | 中国石油大学(北京) | Device for determining axial dispersion coefficient of methylene blue in polymer solution |
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