CN117030706A - Detection method for adsorption of nano oil displacement agent - Google Patents
Detection method for adsorption of nano oil displacement agent Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 317
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 239000010779 crude oil Substances 0.000 claims description 138
- 239000003921 oil Substances 0.000 claims description 136
- 239000003795 chemical substances by application Substances 0.000 claims description 99
- 239000011435 rock Substances 0.000 claims description 56
- 230000008859 change Effects 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 238000000605 extraction Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 239000000376 reactant Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000003079 shale oil Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000009182 swimming Effects 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion 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
- 239000000693 micelle Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Y02A20/204—Keeping clear the surface of open water from oil spills
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Abstract
The invention relates to the field of oil displacement agent detection, in particular to a detection method for nano oil displacement agent adsorption.
Description
Technical Field
The invention relates to the field of oil displacement agent detection, in particular to a detection method for nano oil displacement agent adsorption.
Background
In oil exploitation and oil reservoir engineering, the oil displacement agent can improve oil extraction efficiency and increase the productivity of an oil well. The nano oil displacement agent is a new oil displacement technology, and can improve the interfacial property between oil and water and the displacement effect of crude oil and the oil extraction rate of an oil well by adding nano particles into an oil reservoir.
For example, chinese patent publication No.: CN113234429a discloses a method for preparing a desorbent, which comprises the following steps: adding a nonionic surfactant, a cationic surfactant and a dispersing agent into a container, stirring until the mixture is uniform, and obtaining a first reactant; adding white oil into the first reactant, stirring until the white oil becomes milky emulsion, and obtaining a second reactant; adding water into the second reactant, stirring until the emulsion becomes clear and transparent, and obtaining a desorbent concentrate; diluting the desorbent concentrate with a potassium chloride aqueous solution to obtain a desorbent; in addition, the invention also provides a desorbent performance evaluation method, the desorbent prepared by the invention has nano-scale micelle, can reduce injection pressure, effectively enter shale tiny pore throats without generating a Jack effect, and improves sweep efficiency, thereby driving more adsorption state shale oil, reducing the adsorption of the shale oil on the shale surface and improving the shale oil utilization degree.
However, the prior art has the following problems,
in actual condition, because reservoir rock's lipophilicity and hydrophilicity are different, if reservoir rock belongs to hydrophilicity lipophobicity, then can lead to the displacement liquid to adsorb laminating rock surface flow at the displacement liquid displacement in-process, the intersection in a plurality of clearances, crude oil can be wrapped up by the displacement liquid of laminating on rock surface, and then the path of swimming of crude oil is closed, lead to crude oil to stay, can't be displaced, be called residual oil, to the condition that reservoir rock belongs to lipophobicity, in the displacement early stage, crude oil laminating rock surface accompanies the displacement liquid flow, in the displacement later stage, crude oil adsorbs the oil layer of laminating rock surface and can become gradually thin, finally break, and then be blocked by the displacement liquid, stop flowing.
The prior art does not consider the two different properties of the interaction of rock with water and oil, and the detection of whether an oil displacement agent meets the standards is not fully considered.
Disclosure of Invention
In order to solve the problem that the prior art does not consider that different properties exist in the interaction of rock, water and oil, and whether the oil displacement agent meets the standard or not is evaluated without comprehensive consideration, the invention provides a detection method for nano oil displacement agent adsorption, which comprises the following steps:
step S1, uniformly mixing crude oil and first rock particles, filling the mixture into a first observation bin, uniformly mixing crude oil and second rock particles, and filling the mixture into a second observation bin, wherein the first observation bin and the second observation bin are respectively provided with an observation port, the first rock particles have hydrophilicity and hydrophobicity, and the second rock particles have lipophilicity and hydrophobicity;
step S2, continuously introducing displacement fluid into the fluid inlets of the first observation bin and the second observation bin respectively, and continuously acquiring a first image of the observation port of the first observation bin and a second image of the observation port of the second observation bin;
step S3, identifying crude oil contours in the first image and the second image, and judging whether to stop introducing displacement fluid into the first observation bin or/and the second observation bin based on the change conditions of the crude oil contours in the first image and the second image within a preset time;
step S4, identifying first image features in the first image, adjusting the time for performing secondary displacement on the first observation bin based on the total area of the first image features, identifying second features in the second image, and adjusting the time for performing secondary displacement on the second observation bin, wherein the first image features are crude oil contours corresponding to crude oil wrapped by displacement liquid, and the second image features are crude oil contours corresponding to crude oil attached to the outer wall of second rock particles;
the secondary displacement is to add an oil displacement agent to be detected into the displacement liquid and introduce the oil displacement agent into the first observation bin or/and the second observation bin;
and S5, collecting a first image of the observation port of the first observation bin and a second image of the observation port of the second observation bin after the secondary displacement, comparing the first image of the observation port of the first observation bin before the secondary displacement with a first image characteristic in the first image after the secondary displacement, comparing the second image of the observation port of the second observation bin before the secondary displacement with a second image characteristic of the second image after the secondary displacement, judging the working states of the oil displacement agent of the first observation bin and the second observation bin based on the comparison result, and judging whether the oil displacement agent meets a preset standard based on the working states of the oil displacement agent of the first observation bin and the second observation bin.
Further, in the step S3, a contour area threshold is set, and the contour areas of the identified first image feature and the identified second image feature need to be greater than the contour area threshold.
Further, in the step S3, the change condition of the crude oil profile in the first image and the second image is obtained, including,
setting a fixed period, respectively comparing the areas of crude oil contours in a first image and a second image in the current period with the areas of crude oil contours in the previous period, calculating the variation parameters of the crude oil contours according to a formula (1),
wherein X1 represents the variation parameter of the profile of the crude oil of the first image, X2 represents the variation parameter of the profile of the crude oil of the second image, N represents the number of profiles of the crude oil of the first image, M represents the number of profiles of the crude oil of the second image, S 1i Representing the crude oil area of the ith crude oil profile of the first image of the current period, S 0i Representing the crude oil area of the ith crude oil profile of the first image of the previous cycle, S 2j Representing the crude oil area of the jth crude oil profile of the second image of the current period S 0j Representing the crude oil area of the jth crude oil profile of the second image of the previous cycle.
Further, in the step S3, based on the change conditions of the crude oil profile in the first image and the second image within a predetermined time, it is determined whether to stop the feeding of the displacement fluid into the first observation bin or/and the second observation bin, wherein the change parameters of the crude oil profile of the first image and the change parameters of the crude oil profile of the second image are compared with a preset crude oil profile change parameter comparison threshold,
under a first threshold comparison result, judging that the feeding of the displacement fluid into the first observation bin is stopped;
under a second threshold comparison result, judging that the feeding of the displacement fluid into the second observation bin is stopped;
the first threshold comparison result is that the change parameter of the crude oil profile of the first image is smaller than the change parameter comparison threshold of the crude oil profile, and the second threshold comparison result is that the change parameter of the crude oil profile of the second image is smaller than the change parameter comparison threshold of the crude oil profile.
Further, in the step S4, the time for performing secondary displacement on the first observation bin is adjusted based on the total area of the first image feature, wherein a plurality of adjustment modes for adjusting the time for performing secondary displacement on the first observation bin according to the total area of the first image feature are provided,
in each adjustment mode, the adjustment amount is different when the time of the second displacement of the first observation bin is adjusted.
Further, in the step S4, the time for performing the secondary displacement on the second observation bin is adjusted, wherein a plurality of adjustment modes for adjusting the time for performing the secondary displacement on the second observation bin according to the area of the second image feature are provided,
in each adjustment mode, the adjustment amount is different when the time of performing secondary displacement on the second observation bin is adjusted.
Further, the step S5 is to compare the first image before the second displacement of the first observation port with the first image feature in the first image after the second displacement, compare the second image before the second displacement of the second observation port with the second image feature in the second image after the second displacement, and according to the first image feature area difference value and the second image feature area difference value of the formula (2),
in the formula (2), D1 represents a first image characteristic area difference amount, D2 represents a second image characteristic area difference amount, S 2i Representing the i-th first image characteristic area in the first image after the secondary displacement, S 1i Representing the i-th first image feature area in the first image before secondary displacement, S 2j Representing the j-th second image characteristic area in the second image after the secondary displacement, S 1j The j-th second image feature area in the second image before the secondary displacement is represented, n represents the first image feature quantity in the first image, and m represents the second image feature quantity in the second image.
Further, the step S5 is to determine the working state of the first observation bin oil displacement agent, wherein the first image characteristic area difference value is compared with a preset first image characteristic area difference value threshold value,
when the difference value of the first image characteristic area is larger than a preset threshold value of the difference value of the first image characteristic area, judging that the working state of the oil displacement agent in the first observation bin is a first oil displacement working state;
and when the difference value of the characteristic areas of the first image is smaller than or equal to a preset threshold value of the difference value of the characteristic areas of the first image, judging that the working state of the oil displacement agent in the first observation bin is the second oil displacement working state of the first observation bin.
Further, step S5, determining the working state of the second observation bin oil displacement agent, wherein the second image characteristic area difference value is compared with a preset second image characteristic area difference value threshold value,
when the difference value of the characteristic areas of the second image is larger than a preset threshold value of the difference value of the characteristic areas of the second image, judging that the working state of the oil displacement agent in the second observation bin is the first oil displacement working state;
and when the difference value of the characteristic areas of the second image is smaller than or equal to a preset threshold value of the difference value of the characteristic areas of the second image, judging that the working state of the oil displacement agent in the second observation bin is a second oil displacement working state.
Further, the step S5 is to judge whether the oil displacement agent meets the preset standard based on the working states of the oil displacement agent in the first observation bin and the second observation bin, wherein,
under the first working condition, the oil displacement agent is judged to accord with the preset standard,
under the condition of the second working state, judging that the oil displacement agent does not accord with the preset standard,
the first working condition is that the working state of the oil displacement agent in the first observation bin is a first oil displacement working state, and the working state of the oil displacement agent in the second observation bin is a first oil displacement working state; the second working condition is that the working state of the oil displacement agent in the first observation bin is the second oil displacement working state or/and the working state of the oil displacement agent in the second observation bin is the second oil displacement working state.
Compared with the prior art, the method has the advantages that the displacement liquid is continuously introduced into the two observation bins by simulating the hydrophilic rock and the lipophilic rock oil extraction environment, so that the images of the observation bins are obtained; identifying crude oil contours in the images, and judging whether to stop introducing the displacement fluid into the observation bin based on the change condition of the crude oil contours in the preset time; the method comprises the steps of identifying image features of two observation bins, adjusting the time for performing secondary displacement on the two observation bins based on the area of the image features, collecting images of the two observation bins after secondary displacement, comparing the images of the two observation bins before displacement with the image features of the two observation bins after secondary displacement, judging working states of oil displacement agents of the two observation bins based on comparison results, judging whether the oil displacement agents meet preset standards based on the working states of the oil displacement agents of the two observation bins, and further improving detection accuracy and reliability of the qualification of the oil displacement agents.
In particular, the invention simulates reservoir rocks of different properties, in practical cases, the reservoir rocks actually fill up the gaps which are connected with each other from a microscopic view, the process of displacing crude oil in the gaps is called pore-scale displacement, which is an important index of recovery ratio, and the action of an oil displacement agent in the process is important,
in actual conditions, the lipophilicity and the hydrophilicity of different reservoir rocks are different, and the reservoir rocks with different properties are simulated and delayed through rock particles with different lipophilicity and hydrophilicity properties, so that the effects of oil displacement agents in two application environments are comprehensively considered, and the detection reliability is improved.
Particularly, the invention judges whether to stop introducing the displacement fluid into the first observation bin or/and the second observation bin based on the change condition of the crude oil contours in the first image and the second image in a preset time by identifying the crude oil contours in the first image and the second image, and in the process of displacement, the displacement fluid can displace part of crude oil, after displacing part of crude oil, the area change of the crude oil which is not displaced is smaller, and at the moment, the displacement agent is needed to be added to help the displacement agent to further displace the crude oil, and the efficacy of the displacement agent is mainly embodied in the process of displacing the residual crude oil.
Particularly, the area of the first image feature and the area of the second image feature are adjusted to carry out secondary displacement on the first observation bin and the second observation bin, when the area of the image feature is larger, the displacement time is increased, so that the displacement liquid added with the oil displacement agent fully plays a role, and judgment of the oil displacement effect of the oil displacement agent is prevented from being influenced due to the fact that the displacement time is shorter.
In particular, according to the invention, by comparing the first image before the second displacement of the observation port of the first observation port with the first image in the first image after the second displacement and comparing the second image before the second displacement of the observation port of the second observation port with the second image in the second image after the second displacement, the oil displacement effect of the oil displacement agent is reflected by calculating the area difference of crude oil, in the actual situation, as the reservoir rock is different in lipophilicity and hydrophilicity, if the reservoir rock belongs to the hydrophilic lipophobicity, the displacement liquid is enabled to be attached to the surface of the rock to flow in the displacement liquid displacement process, at the junction of a plurality of gaps, crude oil can be wrapped by the displacement liquid adsorbed and attached to the surface of the rock, and further the swimming path of the crude oil is closed, so that the crude oil can not be displaced, therefore, the characteristic of the first image can be reflected on the image, the condition that the reservoir rock belongs to the lipophobicity is blocked, the surface of the crude oil displacement liquid flows along with the displacement of the oil layer in the displacement front, the oil displacement liquid is gradually attached to the surface of the reservoir rock in the displacement stage, and the oil displacement liquid is gradually attached to the surface of the rock to stop the oil displacement liquid in the displacement stage, and the second image is detected based on the characteristics, and the quality of the quality is improved.
Drawings
FIG. 1 is a step diagram of a detection method of nano oil displacement agent adsorption in an embodiment of the invention;
FIG. 2 is a microscopic schematic of a displacement process in a hydrophilic-lipophilic reservoir rock according to an embodiment of the present invention;
FIG. 3 is a microscopic schematic of a displacement process in a lipophilic hydrophobic reservoir rock according to an embodiment of the present invention;
in the figure, 1: crude oil profile.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, fig. 1 is a step diagram of a detection method of nano oil displacement agent adsorption according to an embodiment of the invention, and the detection method of nano oil displacement agent adsorption according to the invention includes:
step S1, uniformly mixing crude oil and first rock particles, filling the mixture into a first observation bin, uniformly mixing crude oil and second rock particles, and filling the mixture into a second observation bin, wherein the first observation bin and the second observation bin are respectively provided with an observation port, the first rock particles have hydrophilicity and hydrophobicity, and the second rock particles have lipophilicity and hydrophobicity;
step S2, continuously introducing displacement fluid into the fluid inlets of the first observation bin and the second observation bin respectively, and continuously acquiring a first image of the observation port of the first observation bin and a second image of the observation port of the second observation bin;
step S3, identifying crude oil contours in the first image and the second image, and judging whether to stop introducing displacement fluid into the first observation bin or/and the second observation bin based on the change conditions of the crude oil contours in the first image and the second image within a preset time;
step S4, identifying first image features in the first image, adjusting the time for performing secondary displacement on the first observation bin based on the total area of the first image features, identifying second features in the second image, and adjusting the time for performing secondary displacement on the second observation bin, wherein the first image features are crude oil contours corresponding to crude oil wrapped by displacement liquid, and the second image features are crude oil contours corresponding to crude oil attached to the outer wall of second rock particles;
the secondary displacement is to add an oil displacement agent to be detected into the displacement liquid and introduce the oil displacement agent into the first observation bin or/and the second observation bin;
and S5, collecting a first image of the observation port of the first observation bin and a second image of the observation port of the second observation bin after the secondary displacement, comparing the first image of the observation port of the first observation bin before the secondary displacement with a first image characteristic in the first image after the secondary displacement, comparing the second image of the observation port of the second observation bin before the secondary displacement with a second image characteristic of the second image after the secondary displacement, judging the working states of the oil displacement agent of the first observation bin and the second observation bin based on the comparison result, and judging whether the oil displacement agent meets a preset standard based on the working states of the oil displacement agent of the first observation bin and the second observation bin.
Specifically, the method for identifying the image is not particularly limited, in this embodiment, an industrial CCD camera may be used to obtain the image, and of course, in order to make the crude oil profile more characterized, a fluorescent marker may be mixed in the crude oil, and the device for collecting the image needs to be able to collect the corresponding fluorescent marker, which is the prior art and is not described herein.
Specifically, the first observation bin and the second observation bin should be filled with rock particles as full as possible to provide a certain extrusion force, and the temperature control device may be set to heat the first observation bin and the second observation bin in this embodiment so as to simulate the actual rock stratum temperature.
Specifically, the method for identifying the crude oil profile of the image is not limited, in this embodiment, an image identification algorithm capable of identifying the crude oil profile can be trained in advance, and the image is analyzed by the computing device after being led into the computing device, which is not described herein.
In particular, the present invention is not limited to the specific form of the first rock particles and the second rock particles, and extraction from the reservoir rock may be performed in advance, and preferably, the difference in particle size of each rock particle should be as small as possible.
Specifically, the specific structures of the first observation bin and the second observation bin are not limited, the first observation bin and the second observation bin are required to be provided with a space for containing rock particles, and are provided with a liquid inlet and a liquid outlet for introducing displacement liquid, preferably, the side walls of the first observation bin and the second observation bin can be provided with observation openings formed by high-strength glass for observing specific conditions inside, and the detailed description is omitted here.
In the step S3, a contour area threshold is set, and the contour areas of the identified first image feature and the identified second image feature need to be larger than the contour area threshold, so that some crude oil scattering points may exist in actual situations, the features can be ignored, and the operation is reduced on the premise of ensuring the detection reliability.
In this embodiment, the profile area threshold value is obtained by measuring in advance, the average value Se of the profile areas of the crude oils in the first image and the second image is obtained, the profile area threshold value sy=se×α is set, 0.1 < α < 0.15, and α represents the first scale factor.
The invention simulates reservoir rocks with different properties, in actual conditions, the reservoir rocks are actually filled with gaps which are connected with each other from a microscopic view, a process of displacing crude oil in the gaps is called pore-scale displacement, which is an important index of recovery ratio, and the action of an oil displacement agent in the process is important,
in actual conditions, the lipophilicity and the hydrophilicity of different reservoir rocks are different, and the reservoir rocks with different properties are simulated and delayed through rock particles with different lipophilicity and hydrophilicity properties, so that the effects of oil displacement agents in two application environments are comprehensively considered, and the detection reliability is improved.
Specifically, in the step S3, the change condition of the crude oil profile in the first image and the second image is obtained, including,
setting a fixed period, respectively comparing the areas of crude oil contours in a first image and a second image in the current period with the areas of crude oil contours in the previous period, calculating the variation parameters of the crude oil contours according to a formula (1),
wherein X1 represents the variation parameter of the profile of the crude oil of the first image, X2 represents the variation parameter of the profile of the crude oil of the second image, N represents the number of profiles of the crude oil of the first image, M represents the number of profiles of the crude oil of the second image, S 1i Representing the crude oil area of the ith crude oil profile of the first image of the current period, S 0i Representing the crude oil area of the ith crude oil profile of the first image of the previous cycle, S 2j Representing the crude oil area of the jth crude oil profile of the second image of the current period S 0j Representing the crude oil area of the jth crude oil profile of the second image of the previous cycle.
In this embodiment, the duration of the fixed period is set to 10min.
Specifically, in the step S3, based on the change conditions of the crude oil profile in the first image and the second image in the predetermined time, it is determined whether to stop introducing the displacement fluid into the first observation bin or/and the second observation bin, wherein the change parameters of the crude oil profile of the first image and the change parameters of the crude oil profile of the second image are compared with a preset crude oil profile change parameter comparison threshold,
under a first threshold comparison result, judging that the feeding of the displacement fluid into the first observation bin is stopped;
under a second threshold comparison result, judging that the feeding of the displacement fluid into the second observation bin is stopped;
the first threshold comparison result is that the change parameter of the crude oil profile of the first image is smaller than the change parameter comparison threshold of the crude oil profile, and the second threshold comparison result is that the change parameter of the crude oil profile of the second image is smaller than the change parameter comparison threshold of the crude oil profile.
The predetermined time is twice as long as the fixed period.
The crude oil profile variation parameter comparison threshold is determined based on the average value Se of the profile areas of the crude oil in the first image and the second image, and the crude oil profile variation parameter comparison threshold Sd=Se×beta, beta represents a second proportionality coefficient, and 0.05 < beta < 0.1.
According to the invention, by identifying the crude oil contours in the first image and the second image and based on the change conditions of the crude oil contours in the first image and the second image within a preset time, whether to stop introducing the displacement liquid into the first observation bin or/and the second observation bin is judged, in the displacement process, the displacement liquid can displace part of crude oil, after displacing part of crude oil, the area change of the crude oil which is not displaced is small, at the moment, the displacement agent is needed to be added, the displacement agent is used for assisting the displacement agent to further displace the crude oil, and the efficacy of the displacement agent is mainly embodied in the process of displacing the residual crude oil.
Specifically, in the step S4, the time for performing the secondary displacement on the first observation bin is adjusted based on the total area of the first image features, wherein a plurality of adjustment manners for adjusting the time for performing the secondary displacement on the first observation bin according to the total area of the first image features are provided,
in each adjustment mode, the adjustment amount is different when the time of the second displacement of the first observation bin is adjusted.
In this embodiment, at least three adjustment modes for adjusting the time of the second observation bin according to the total area of the first image feature are set, wherein the total area S1 of the first image feature is compared with the preset total area S '1 of the first image feature and the preset total area S'2 of the first image feature, S '2 > S'1,
if S1 is less than or equal to S'1, a first adjustment mode of secondary displacement time of a first observation bin is adopted, wherein the first adjustment mode of secondary displacement time of the first observation bin is that the time of secondary displacement of the first observation bin is adjusted to a first time t1 of secondary displacement of the first observation bin, and t1=t0+Δt1 is set;
if S '1 is less than S1 and less than S'2, adopting a second adjustment mode of performing secondary displacement of the first observation bin, wherein the second adjustment mode of performing secondary displacement of the first observation bin is to adjust the time of performing secondary displacement of the first observation bin to a second time t2 of performing secondary displacement of the first observation bin, and setting t2=t0+Δt2;
if S1 is more than or equal to S'2, a third adjustment mode of the second displacement time of the first observation bin is adopted, wherein the third adjustment mode of the second displacement time of the first observation bin is that the second displacement time of the first observation bin is adjusted to a third time t3 of the second displacement of the first observation bin, and t3=t0+Δt3 is set;
wherein t0 represents the reference time for the second observation chamber to perform the second displacement, Δt1 represents the second displacement time adjustment parameter for the first observation chamber, Δt2 represents the second displacement time adjustment parameter for the second first observation chamber, Δt3 represents the second displacement time adjustment parameter for the third first observation chamber, and similarly, in order to make the adjustment effective and avoid the excessive adjustment amount, 0.1t0 < Δt1 < Δt2 < Δt3 < 0.3t0 in the present embodiment.
In this embodiment, S '1 and S'2 are measured in advance, wherein the average value S01 of the total area of the first image feature after several displacement experiments performed by the first observation bin is recorded, and s1=0.15s01 and s2= 0.3S01 are set.
The reference time is set within the interval [30min,1h ].
Specifically, in the step S4, the time for performing the secondary displacement on the second observation bin is adjusted, wherein a plurality of adjustment modes for adjusting the time for performing the secondary displacement on the second observation bin according to the area of the second image feature are provided,
in each adjustment mode, the adjustment amount is different when the time of performing secondary displacement on the second observation bin is adjusted.
In this embodiment, at least three adjustment modes for adjusting the time of the second observation bin for secondary displacement according to the area of the second image feature are set, wherein the area S2 of the second image feature is compared with a preset area S "1 of the second image feature and a preset area S"2 of the second image feature, S "2 > S"1,
if S2 is less than or equal to S '1, a first adjustment mode of secondary displacement time of a second observation bin is adopted, wherein the first adjustment mode of secondary displacement time of the second observation bin is that the time of secondary displacement of the second observation bin is adjusted to a first time t1' of secondary displacement of the second observation bin, and t1' =t0 ' +Δt1' is set;
if S "1 < S2 < S"2, a second adjustment mode of performing secondary displacement for the second observation bin is adopted, wherein the second adjustment mode of performing secondary displacement for the second observation bin is to adjust the time of performing secondary displacement for the second observation bin to a second time t2 'of performing secondary displacement for the second observation bin, and t2' =t0 '+Δt2' is set;
if S2 is more than or equal to S '2, a third adjustment mode of secondary displacement time of a second observation bin is adopted, wherein the third adjustment mode of secondary displacement time of the second observation bin is that the time of secondary displacement of the second observation bin is adjusted to a third time t3' of secondary displacement of the second observation bin, and t3' =t0 ' +Deltat3 ';
wherein t0' represents the reference time for the second observation bin to perform the secondary displacement, Δt1' represents the secondary displacement time adjustment parameter for the first second observation bin, Δt2' represents the secondary displacement time adjustment parameter for the second observation bin, Δt3' represents the secondary displacement time adjustment parameter for the third second observation bin, and also, in order to make the adjustment effective and avoid the adjustment amount being excessively large, in this embodiment, 0.1t0' < Δt1' < Δt2' < Δt3' < 0.3t0'.
In this example, S "1 and S"2 are measured in advance, wherein the average value S02 of the total area of the second image feature after several displacement experiments by the second observation bin is recorded, and s1=0.15s02 and s2= 0.3S02 are set.
The reference time is set within the interval [30min,1h ].
Specifically, the area of the first image feature and the area of the second image feature are adjusted to carry out secondary displacement on the first observation bin and the second observation bin, when the area of the image feature is larger, the displacement time is increased, so that the displacement liquid added with the oil displacement agent fully plays a role, and judgment of the oil displacement effect of the oil displacement agent is prevented from being influenced due to the fact that the displacement time is shorter.
Specifically, in the step S5, the first image before the second displacement of the first observation port and the first image feature in the first image after the second displacement are compared, the second image before the second displacement of the second observation port and the second image feature in the second image after the second displacement are compared, the first image feature area difference value and the second image feature area difference value according to the formula (2),
in the formula (2), D1 represents a first image characteristic area difference amount, D2 represents a second image characteristic area difference amount, S 2i Representing the i-th first image characteristic area in the first image after the secondary displacement, S 1i Representing the i-th first image feature area in the first image before secondary displacement, S 2j Representing the j-th second image characteristic area in the second image after the secondary displacement, S 1j The j-th second image feature area in the second image before the secondary displacement is represented, n represents the first image feature quantity in the first image, and m represents the second image feature quantity in the second image.
Specifically, the step S5 is to determine the working state of the first observation bin oil displacement agent, wherein the first image characteristic area difference value is compared with a preset first image characteristic area difference value threshold,
when the difference value of the first image characteristic area is larger than a preset threshold value of the difference value of the first image characteristic area, judging that the working state of the oil displacement agent in the first observation bin is a first oil displacement working state;
and when the difference value of the characteristic areas of the first image is smaller than or equal to a preset threshold value of the difference value of the characteristic areas of the first image, judging that the working state of the oil displacement agent in the first observation bin is the second oil displacement working state of the first observation bin.
The preset first image characteristic area difference value threshold DeltaS 1 is determined based on the total area S10 of the first image characteristic in the first image before secondary displacement, deltaS1=S10×g is set, g represents a displacement precision coefficient, and 0.1 < g < 0.5.
Specifically, the step S5 is to determine the working state of the second observation bin oil displacement agent, wherein the second image characteristic area difference value is compared with a preset second image characteristic area difference value threshold,
when the difference value of the characteristic areas of the second image is larger than a preset threshold value of the difference value of the characteristic areas of the second image, judging that the working state of the oil displacement agent in the second observation bin is the first oil displacement working state;
and when the difference value of the characteristic areas of the second image is smaller than or equal to a preset threshold value of the difference value of the characteristic areas of the second image, judging that the working state of the oil displacement agent in the second observation bin is a second oil displacement working state.
The preset second image characteristic area difference value threshold DeltaS 2 is determined based on the total area S20 of the second image characteristic in the second image before secondary displacement, deltaS2=S20×g is set, g represents a displacement precision coefficient, and 0.1 < g < 0.5.
Specifically, referring to fig. 2 and 3, in the present invention, by comparing a first image before secondary displacement of a first observation port with a first image in a first image after secondary displacement of a first observation port and comparing a second image before secondary displacement of a second observation port with a second image in a second image after secondary displacement, an oil displacement effect of an oil displacement agent is reflected, in an actual situation, if reservoir rock is of a hydrophilic and oleophobic nature, as shown in fig. 2, the displacement liquid is caused to flow on the rock surface in the displacement liquid displacement process, crude oil is wrapped by the displacement liquid adsorbed on the rock surface in the junction of a plurality of gaps, and a swimming path of crude oil is closed, so that crude oil is not driven out, and is called residual oil, therefore, the image is reflected as a first image feature, and in the situation that the reservoir rock is of a hydrophobic and oleophobic nature, as shown in fig. 3, the oil displacement agent is reflected, the second image is detected on the surface of the first displacement liquid, and the second displacement liquid is stopped on the basis of the first displacement liquid, and the second displacement liquid is stopped on the surface feature, and the second displacement liquid is gradually stopped on the basis of the characteristics, and the quality is improved.
Specifically, the step S5 judges whether the oil displacement agent meets the preset standard or not based on the working states of the oil displacement agent of the first observation bin and the second observation bin, wherein,
under the first working condition, the oil displacement agent is judged to accord with the preset standard,
under the condition of the second working state, judging that the oil displacement agent does not accord with the preset standard,
the first working condition is that the working state of the oil displacement agent in the first observation bin is a first oil displacement working state, and the working state of the oil displacement agent in the second observation bin is a first oil displacement working state; the second working condition is that the working state of the oil displacement agent in the first observation bin is the second oil displacement working state or/and the working state of the oil displacement agent in the second observation bin is the second oil displacement working state.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (10)
1. The detection method for the adsorption of the nano oil displacement agent is characterized by comprising the following steps of:
step S1, uniformly mixing crude oil and first rock particles, filling the mixture into a first observation bin, uniformly mixing crude oil and second rock particles, and filling the mixture into a second observation bin, wherein the first observation bin and the second observation bin are respectively provided with an observation port, the first rock particles have hydrophilicity and hydrophobicity, and the second rock particles have lipophilicity and hydrophobicity;
step S2, continuously introducing displacement fluid into the fluid inlets of the first observation bin and the second observation bin respectively, and continuously acquiring a first image of the observation port of the first observation bin and a second image of the observation port of the second observation bin;
step S3, identifying crude oil contours in the first image and the second image, and judging whether to stop introducing displacement fluid into the first observation bin or/and the second observation bin based on the change conditions of the crude oil contours in the first image and the second image within a preset time;
step S4, identifying first image features in the first image, adjusting the time for performing secondary displacement on the first observation bin based on the total area of the first image features, identifying second features in the second image, and adjusting the time for performing secondary displacement on the second observation bin, wherein the first image features are crude oil contours corresponding to crude oil wrapped by displacement liquid, and the second image features are crude oil contours corresponding to crude oil attached to the outer wall of second rock particles;
the secondary displacement is to add an oil displacement agent to be detected into the displacement liquid and introduce the oil displacement agent into the first observation bin or/and the second observation bin;
and S5, collecting a first image of the observation port of the first observation bin and a second image of the observation port of the second observation bin after the secondary displacement, comparing the first image of the observation port of the first observation bin before the secondary displacement with a first image characteristic in the first image after the secondary displacement, comparing the second image of the observation port of the second observation bin before the secondary displacement with a second image characteristic of the second image after the secondary displacement, judging the working states of the oil displacement agent of the first observation bin and the second observation bin based on the comparison result, and judging whether the oil displacement agent meets a preset standard based on the working states of the oil displacement agent of the first observation bin and the second observation bin.
2. The method according to claim 1, wherein in the step S3, a profile area threshold is set, and the profile areas of the identified first image feature and the identified second image feature need to be larger than the profile area threshold.
3. The method for detecting adsorption of a nano oil displacement agent according to claim 1, wherein in the step S3, the change condition of the crude oil profile in the first image and the second image is obtained, including,
setting a fixed period, respectively comparing the areas of crude oil contours in a first image and a second image in the current period with the areas of crude oil contours in the previous period, calculating the variation parameters of the crude oil contours according to a formula (1),
wherein X1 represents the variation parameter of the profile of the crude oil of the first image, X2 represents the variation parameter of the profile of the crude oil of the second image, N represents the number of profiles of the crude oil of the first image, M represents the number of profiles of the crude oil of the second image, S 1i Representing the crude oil area of the ith crude oil profile of the first image of the current period, S 0i Representing the crude oil area of the ith crude oil profile of the first image of the previous cycle, S 2j Representing the crude oil area of the jth crude oil profile of the second image of the current period S 0j Representing the crude oil area of the jth crude oil profile of the second image of the previous cycle.
4. The method for detecting adsorption of nano oil displacement agent according to claim 3, wherein in the step S3, based on the change conditions of crude oil profile in the first image and the second image within a predetermined time, it is determined whether to stop introducing the displacement fluid into the first observation bin or/and the second observation bin, wherein the change parameters of the crude oil profile of the first image and the change parameters of the crude oil profile of the second image are compared with a preset crude oil profile change parameter comparison threshold value,
under a first threshold comparison result, judging that the feeding of the displacement fluid into the first observation bin is stopped;
under a second threshold comparison result, judging that the feeding of the displacement fluid into the second observation bin is stopped;
the first threshold comparison result is that the change parameter of the crude oil profile of the first image is smaller than the change parameter comparison threshold of the crude oil profile, and the second threshold comparison result is that the change parameter of the crude oil profile of the second image is smaller than the change parameter comparison threshold of the crude oil profile.
5. The method for detecting nano-oil displacement agent adsorption according to claim 1, wherein the step S4 is characterized in that the time for performing the secondary displacement on the first observation bin is adjusted based on the total area of the first image feature, wherein a plurality of adjustment modes are provided for adjusting the time for performing the secondary displacement on the first observation bin according to the total area of the first image feature,
in each adjustment mode, the adjustment amount is different when the time of the second displacement of the first observation bin is adjusted.
6. The method for detecting nano-oil displacement agent adsorption according to claim 1, wherein in the step S4, the time for performing the secondary displacement on the second observation bin is adjusted, wherein a plurality of adjustment modes for adjusting the time for performing the secondary displacement on the second observation bin according to the area of the second image feature are provided,
in each adjustment mode, the adjustment amount is different when the time of performing secondary displacement on the second observation bin is adjusted.
7. The method for detecting nano-oil displacement agent adsorption according to claim 1, wherein the step S5 is performed by comparing the first image before the second displacement of the first observation port with the first image feature in the first image after the second displacement, comparing the second image before the second displacement of the second observation port with the second image feature in the second image after the second displacement, and determining the first image feature area difference and the second image feature area difference according to the formula (2),
in the formula (2), D1 represents a first image characteristic area difference amount, D2 represents a second image characteristic area difference amount, S 2i Representing the i-th first image characteristic area in the first image after the secondary displacement, S 1i Representing the i-th first image feature area in the first image before secondary displacement, S 2j Representing the j-th second image characteristic area in the second image after the secondary displacement, S 1j The j-th second image feature area in the second image before the secondary displacement is represented, n represents the first image feature quantity in the first image, and m represents the second image feature quantity in the second image.
8. The method for detecting the adsorption of the nano-oil displacement agent according to claim 1, wherein the step S5 is to determine the working state of the first observation bin oil displacement agent, wherein the first image characteristic area difference value is compared with a preset first image characteristic area difference value threshold,
when the difference value of the first image characteristic area is larger than a preset threshold value of the difference value of the first image characteristic area, judging that the working state of the oil displacement agent in the first observation bin is a first oil displacement working state;
and when the difference value of the characteristic areas of the first image is smaller than or equal to a preset threshold value of the difference value of the characteristic areas of the first image, judging that the working state of the oil displacement agent in the first observation bin is the second oil displacement working state of the first observation bin.
9. The method for detecting the adsorption of the nano-oil displacement agent according to claim 1, wherein the step S5 is to determine the working state of the second observation bin oil displacement agent, wherein the second image characteristic area difference is compared with a preset second image characteristic area difference threshold,
when the difference value of the characteristic areas of the second image is larger than a preset threshold value of the difference value of the characteristic areas of the second image, judging that the working state of the oil displacement agent in the second observation bin is the first oil displacement working state;
and when the difference value of the characteristic areas of the second image is smaller than or equal to a preset threshold value of the difference value of the characteristic areas of the second image, judging that the working state of the oil displacement agent in the second observation bin is a second oil displacement working state.
10. The method for detecting nano-meter oil-displacing agent adsorption according to claim 1, wherein step S5 is performed to determine whether the oil-displacing agent meets a predetermined criterion based on the operating states of the oil-displacing agent in the first observation bin and the second observation bin,
under the first working condition, the oil displacement agent is judged to accord with the preset standard,
under the condition of the second working state, judging that the oil displacement agent does not accord with the preset standard,
the first working condition is that the working state of the oil displacement agent in the first observation bin is a first oil displacement working state, and the working state of the oil displacement agent in the second observation bin is a first oil displacement working state; the second working condition is that the working state of the oil displacement agent in the first observation bin is the second oil displacement working state or/and the working state of the oil displacement agent in the second observation bin is the second oil displacement working state.
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