CN115788384A - System and method for simulating heavy oil reservoir steam channeling blocking and adjusting based on micro-fluidic - Google Patents

Abstract

The application discloses system based on stifled accent is scurried to micro-fluidic simulation viscous crude oil reservoir steam, including setting up two sculpture transparent medium pieces that the centre on heating device has the pore structure who is used for reflecting the steam advantage passageway that scurries, the injection site of sculpture transparent medium piece is connected with steam generating device, oil storage device and granule suspension storage device, the two other end is connected to first displacement device jointly, steam generating device's the other end is connected to second displacement device, the play oil position of sculpture transparent medium piece is connected with and produces liquid collection device and the top is provided with image acquisition device, image acquisition device and heating device electricity are connected to data acquisition analytical equipment, this system can let the experimenter survey stifled accent process and the oil recovery effect of viscous crude oil reservoir steam and blocking agent granule down, further develop the development potentiality after the viscous crude oil reservoir steam scurries, and the simulation precision is higher. The application also discloses a method for simulating the blocking and the adjusting of the heavy oil reservoir steam channeling based on the micro-fluidic system.

Description

System and method for simulating heavy oil reservoir steam channeling blocking and adjusting based on micro-fluidic

Technical Field

The invention belongs to the technical field of heavy oil reservoir development, and particularly relates to a system and a method for simulating heavy oil reservoir steam channeling blocking and adjusting based on micro-fluidic.

Background

The global thick oil resource is extremely rich, and the thick oil also becomes an important component of the crude oil yield in China. In terms of utilization of thick oil resources, heavy components in thick oil are often used to refine high-end lubricating oil, high-grade asphalt, refrigerating machine oil, and the like. Under the condition that the international energy source contradiction is increasingly prominent, the heavy oil resource is vigorously developed to meet the requirements of economy, energy and strategic safety in China.

Because the viscosity of the heavy oil is high, a steam injection mode is generally adopted to recover the heavy oil reservoir, wherein steam stimulation is the most widely applied heavy oil thermal recovery development mode, and after multiple rounds of steam stimulation are carried out, steam flooding is the main successive development mode. Due to the fact that the thick oil reservoir layer or interlayer has heterogeneity, and unreasonable steam injection parameters or steam overlap, at the later stage of hot production development of the thick oil reservoir, cross-flow channels between wells develop, so that the sweep efficiency of steam or hot water is reduced, and a large amount of residual oil is retained in the stratum. In order to further improve the recovery efficiency, the effective plugging of the gas channeling dominant channel becomes an important means for improving the development effect of the heavy oil reservoir in the later stage of steam development.

In the prior art, when simulation research is performed on thick oil reservoir gas channeling plugging regulation, an experimental system and a method for evaluating thick oil recovery by air foam assisted steam flooding are adopted, and the experiment is performed by using parallel sand-filling pipe experimental devices, as shown in fig. 1, fig. 1 is a schematic structural diagram of an experimental system for evaluating thick oil recovery by air foam assisted steam flooding in the prior art, wherein the experimental system comprises an air bottle 21, a dryer 22, a gas flow measurement and control device 23, a check valve 24, a first precision pressure gauge 25, a first ISCO injection pump 26, an intermediate container 27, a foam generator 28, a first back pressure valve 29, a second precision pressure gauge 210, a second ISCO injection pump 211, a steam generator 212, a second back pressure valve 213, a third precision pressure gauge 214, an injection pipeline with a heat device 215, a first beaker 217, a second beaker 219, a first production trace 41, a third back pressure valve 42, a fourth precision pressure gauge 43, a first wide-mouthed pressure bottle 44, a first gas sample-carrying sample receiving bag 45, a second back pressure line 46, a fourth production trace line 167, a first heat-tracing pipe plug 35, a second heat-collecting device 31, a second sand-filling pipe plug 16, a heat-collecting pipe plug 16, a second sand-filling pipe sample collecting device 31, a second sand-filling pipe plug 16, a heat-collecting device 16, a heat-collecting pipe plug 16, a sampling device and a heat-collecting pipe plug 16. The experiment system and the method can better evaluate the profile control effect of the injected medium after the steam channeling of the heavy oil reservoir, but the experiment system and the method can not allow people to observe the process of particle plugging and profile control and the effect of profile control after the steam channeling of the heavy oil reservoir with particles under the pore size, and meanwhile, the traditional physical simulation of the sand-packed pipe has the defects of long experiment period, large workload of personnel, large sample consumption and the like.

Disclosure of Invention

In order to solve the problems, the invention provides a system and a method for simulating the blocking and adjusting of the steam channeling of the heavy oil reservoir based on micro-fluidic, which can enable an experimenter to observe the blocking and adjusting process and the oil extraction effect of steam and plugging agent particles after the steam channeling of the heavy oil reservoir under the pore scale, enable the experimenter to more deeply know and evaluate the blocking and adjusting process and the blocking and adjusting effect of the plugging agent particles in the heavy oil reservoir in the later stage of thermal recovery development, further develop the development potential of the heavy oil reservoir after the steam channeling, and have the advantages of higher simulation precision, simpler operation, shorter experimental period and less sample consumption.

The invention provides a system for simulating heavy oil reservoir steam channeling blocking and adjusting based on micro-fluidic, which comprises two etched transparent medium sheets arranged on a heating device and provided with a pore structure for reflecting a steam channeling dominant channel in the middle, wherein the injection parts of the etched transparent medium sheets are connected with a steam generation device, an oil storage device and a particle suspension storage device, the other ends of the oil storage device and the particle suspension storage device are connected to a first displacement device together, the other end of the steam generation device is connected to a second displacement device, the oil outlet part of the etched transparent medium sheet is connected with a produced liquid collection device, an image collection device is arranged above the produced liquid collection device, and the image collection device and the heating device are electrically connected to a data collection and analysis device together.

Preferably, in the system for simulating the steam channeling, blocking and adjusting of the heavy oil reservoir based on the microfluidic control, a pressure sensor is further arranged at the front end of the injection part of the etching transparent medium sheet, and the pressure sensor is electrically connected with the data acquisition and analysis device.

Preferably, in the system for simulating the blocking and adjusting of the heavy oil reservoir by the microfluidic control, a flow sensor is further arranged at the front end of the injection part of the etched transparent medium sheet, and the flow sensor is electrically connected with the data acquisition and analysis device.

Preferably, in the system for simulating the steam channeling and blocking and adjusting of the heavy oil reservoir based on the micro-fluidic system, the image acquisition device is an electron microscope.

Preferably, in the system for simulating heavy oil reservoir steam channeling and plugging based on microfluidics, the system further comprises a light source device arranged facing the etched transparent medium sheet.

Preferably, in the system for simulating the steam channeling, blocking and adjusting of the heavy oil reservoir based on the micro-fluidic system, the transparent etching medium sheet is an etching glass sheet.

Preferably, in the system for simulating the steam channeling and blocking and adjusting of the heavy oil reservoir based on the micro-fluidic system, the first displacement device comprises a micro displacement pump and a micro compressor, wherein the micro displacement pump is communicated with the oil storage device and the particle suspension storage device, and the micro compressor is connected with the other end of the micro displacement pump.

Preferably, in the system for simulating the steam channeling, blocking and adjusting of the heavy oil reservoir based on the micro-fluidic system, the second displacement device is a high-precision displacement pump.

Preferably, in the system for simulating heavy oil reservoir steam channeling and plugging based on microfluidics, the heating device is a heating plate which can be set to the temperature of the stratum.

The invention provides a method for simulating heavy oil reservoir steam channeling plugging and adjusting based on micro-fluidic, which utilizes a system for simulating heavy oil reservoir steam channeling plugging and adjusting based on micro-fluidic as described in any one of the above items, and comprises the following steps:

setting the temperature of the heating device as the formation temperature, and placing the etched transparent medium sheet on the heating device;

injecting thick oil into the oil storage device, utilizing the first displacement device to displace the oil storage device to saturate an oil sample in the injection part of the etched transparent medium sheet, and starting the image acquisition device;

injecting steam generated by the steam generating device into the etched transparent medium sheet by using the second displacement device until the water content of the output liquid reaches a preset threshold value;

displacing the particle suspension storage device by using the first displacement device to inject particle suspension with the volume being a preset multiple of the pore volume into the etching transparent medium sheet;

injecting the steam generated by the steam generating device into the etched transparent medium sheet by using the second displacement device again until the water content of the output liquid reaches a preset threshold value;

recording a microscopic image, an injection speed and an injection time in the displacement process acquired by the image acquisition device by using the data acquisition and analysis device, and recording the water yield in the liquid production collection device;

calculating different injection pore volume multiples by using the injection speed, the injection time and the total pore volume of the etched transparent medium sheet to obtain a relation curve of the injection speed and the injection pore volume multiples;

calculating the recovery ratio by etching the total saturated oil quantity in the transparent medium sheet and the oil saturation ratios corresponding to different injection pore volume multiples to obtain a relation curve of the recovery ratio and the injection pore volume multiples, and analyzing the oil extraction effect of the blockage and adjustment of the steam channeling channel of the heavy oil reservoir;

and calculating the water content by etching the total saturated oil quantity, the recovery ratio and the water yield in the transparent medium sheet to obtain a relation curve of the water content and the injection pore volume multiple.

According to the system for simulating the steam channeling plugging and adjusting of the heavy oil reservoir based on the micro-fluidic system, which is provided by the invention, the system comprises two etched transparent medium sheets which are arranged on a heating device and provided with a pore structure for reflecting a steam channeling dominant channel in the middle, the injection parts of the etched transparent medium sheets are connected with a steam generating device, an oil storage device and a particle suspension storage device, the other ends of the oil storage device and the particle suspension storage device are jointly connected to a first displacement device, the other end of the steam generating device is connected to a second displacement device, the oil outlet part of the etched transparent medium sheets is connected with a produced liquid collecting device, an image collecting device is arranged above the produced liquid collecting device, and the image collecting device and the heating device are jointly and electrically connected to a data collecting and analyzing device, so that an experimenter can observe the plugging and adjusting process and the oil extraction effect of steam and plugging agent particles after steam channeling of the heavy oil reservoir under the pore scale, the plugging and adjusting effect of the plugging agent particles in the heavy oil reservoir in the later stage of thermal production development can be further developed, the simulation precision is higher, the operation is simpler, the experiment period is shorter, and the experiment period is shorter. The invention also provides a method for simulating the steam channeling and blocking and adjusting of the heavy oil reservoir based on the micro-fluidic system, which has the same advantages as the system.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an experimental system for evaluating the exploitation of thick oil by air foam assisted steam flooding in the prior art;

FIG. 2 is a schematic diagram of an embodiment of a system for simulating steam channeling blocking and adjusting of a heavy oil reservoir based on microfluidics, provided by the invention;

FIG. 3 is a schematic diagram of an embodiment of a system for simulating heavy oil reservoir steam channeling plugging based on microfluidics;

fig. 4 is a schematic diagram of an embodiment of a method for simulating steam channeling blocking and adjusting of a heavy oil reservoir based on microfluidics, provided by the invention;

FIG. 5 is a diagram illustrating the plugging and adjusting effect of particles in a steam channeling channel of a heavy oil reservoir;

FIG. 6 is a graph showing the relationship between injection rate, water cut and recovery ratio for different injection pore volume factors.

Detailed Description

The core of the invention is to provide a system and a method for simulating the blocking and adjusting of the steam channeling of the heavy oil reservoir based on micro-fluidic, which can enable an experimenter to observe the blocking and adjusting process and the oil extraction effect of steam and blocking agent particles after the steam channeling of the heavy oil reservoir under the pore scale, enable the experimenter to more deeply know and evaluate the blocking and adjusting process and the blocking and adjusting effect of the blocking agent particles in the heavy oil reservoir in the later stage of thermal recovery development, further develop the development potential of the heavy oil reservoir after the steam channeling, and have higher simulation precision, simpler operation, shorter experimental period and less sample consumption.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 2 is a schematic diagram of an embodiment of a system for simulating heavy oil reservoir steam channeling blocking and adjusting based on a microfluidic system, the system may include two etched transparent medium sheets 2 disposed on a heating device 1 and having a pore structure in the middle for reflecting a steam channeling dominant channel, an injection portion of each etched transparent medium sheet 2 is connected to a steam generation device 3, an oil storage device 4 and a particle suspension storage device 5, the oil storage device 4 and the particle suspension storage device 5 may be fixed by a fixing plate, the other ends of the oil storage device 4 and the particle suspension storage device 5 are commonly connected to a first displacement device 6, the other end of the steam generation device 3 is connected to a second displacement device 7, a product liquid collection device 8 is connected to a portion of each etched transparent medium sheet 2, and an image collection device 9 is disposed above the etched transparent medium sheet 2, a lens of the image collection device 9 may face the etched transparent medium sheet 2, the product liquid collection device 8 may be a test tube fixed above the test tube, and the image collection device 9 and the heating device 1 are electrically connected to an analysis device 10.

It should be noted that the above embodiment is a microscopic visualization system, and the process of using the system may be as follows: placing the etching transparent medium sheet 2 on a heating device 1, and setting the temperature to be stratum; preparing thick oil and particle suspension; saturated thick oil is saturated in the etched transparent medium sheet 2; injecting steam into the etched transparent medium sheet 2 to form a steam channeling channel, injecting particle suspension to block the steam channeling channel, then injecting steam to a non-affected oil area, displacing until the water content is 98%, recording an image, an injection speed and an injection time of a displacement process through a data acquisition and analysis device 10 connected with an image acquisition device 9, and recording the oil yield and the water yield of the test tube; drawing a relation curve of injection speed, water content, recovery ratio and injection pore volume multiple; the oil extraction effect of the heavy oil reservoir steam channeling channel plugging and adjusting technology is obtained.

According to the embodiment of the system for simulating the steam channeling plugging and adjusting of the heavy oil reservoir based on the micro-fluidic system, which is provided by the invention, the system comprises two etched transparent medium sheets which are arranged on a heating device and provided with a pore structure for reflecting a steam channeling dominant channel in the middle, the injection part of each etched transparent medium sheet is connected with a steam generating device, an oil storage device and a particle suspension storage device, the other ends of the oil storage device and the particle suspension storage device are jointly connected to a first displacement device, the other end of the steam generating device is connected to a second displacement device, the oil outlet part of each etched transparent medium sheet is connected with a produced liquid collecting device, an image collecting device is arranged above the produced liquid collecting device, and the image collecting device and the heating device are jointly and electrically connected to a data collecting and analyzing device.

In an embodiment of the system for simulating heavy oil reservoir steam channeling and plugging based on microfluidics, referring to fig. 3, fig. 3 is a schematic diagram of an embodiment of the system for simulating heavy oil reservoir steam channeling and plugging based on microfluidics, a pressure sensor 11 may be further disposed at a front end of an injection part of the etched transparent medium sheet 2, and the pressure sensor 11 is electrically connected to the data acquisition and analysis device 10, so that the pressure sensor 11 is disposed closer to the etched transparent medium sheet 2, the pressure in the injection process can be measured in real time more accurately, and the acquired pressure data can be transmitted to the data acquisition and analysis device 10 in real time. Moreover, the front end of the injection part of the etched transparent medium sheet 2 can be further provided with a flow sensor 12, and the flow sensor 12 is electrically connected with the data acquisition and analysis device 10, so that the flow sensor 12 is also arranged closer to the etched transparent medium sheet 2, the flow size in the injection process can be measured more accurately in real time, and the acquired flow data can be transmitted to the data acquisition and analysis device 10 in real time.

With continued reference to fig. 3, the image collecting device 9 may preferably be an electron microscope, and it should be noted that the electron microscope can directly observe the structure of the sample surface, the size of the sample can be as large as 120mm × 80mm × 50mm, the sample preparation process is simple, the sample does not need to be cut into slices, and the sample can be translated and rotated in three dimensions in the sample chamber, so that the sample can be observed from various angles, the depth of field is large, the image is stereoscopic, the depth of field of the scanning electron microscope is hundreds of times larger than that of the optical microscope and hundreds of times larger than that of the transmission electron microscope, the image magnification range is wide, the resolution ratio is also higher, and the sample can be magnified tens of times to hundreds of thousands of times, and the image basically includes the magnification range from a magnifying lens, the optical microscope to the transmission electron microscope, the resolution ratio is between the optical microscope and the transmission electron microscope and can reach 3nm, the damage and the pollution degree of the sample by the electron beam is smaller, and other signals emitted from the sample can be used for analyzing the composition of the micro-area while observing the morphology. Further, the device can further include a light source device 13 disposed facing the etched transparent medium sheet 2, and the light source device 13 can assist in illuminating the etched transparent medium sheet 2 to make it brighter, so that the image acquisition device 9 acquires clearer images, and details in the images can be acquired more conveniently, so that analysis is more accurate, and the type of the light source device specifically adopted can be set according to actual needs, such as an LED light source, and the like, without limitation here.

In another specific embodiment of the system for simulating the blocking and adjusting of the steam channeling of the heavy oil reservoir based on the microfluidic control, the transparent etching medium sheet 2 may be preferably an etched glass sheet, and it should be noted that the glass material can resist higher temperature, so that when the system is used in the heavy oil experiment, the experimentable temperature range is wider, and the real condition in the stratum can be better simulated. Furthermore, with continued reference to fig. 3, the first displacement device 6 may comprise a micro-displacement pump 601 which is in communication with the oil storage device 4 and the particle suspension storage device 5, and a micro-compressor 602 which is connected to the other end of the micro-displacement pump 601, and by means of which the thick oil and the particle suspension can be displaced into the transparent etching medium sheet 2, so as to meet the requirements of the simulation experiment. In addition, the second displacement device 7 may preferably be a high-precision displacement pump, which is more suitable for steam displacement of thick oil, so that the displacement amount can be controlled to be more precise, and the second displacement device is more suitable for displacing steam into the transparent etching medium sheet 2, thereby meeting the requirement of more precise simulation experiment. It should be noted that the heating device 1 may be a heating plate that can be set to the formation temperature, so that the situation in the formation can be better simulated, the situation is more realistic, and the obtained analysis result is more in line with the actual situation.

It should be noted that, with reference to fig. 3, a multi-way valve 14 may be used for connection, specifically, the multi-way valve 14 may be used to connect the oil storage device 4, the particle suspension storage device 5, the steam generation device 3 and the inlet end of the transparent etching medium sheet 2 at the same time, and the data acquisition and analysis device 10 may be a computer, and may be capable of simultaneously implementing functions of data acquisition, storage, analysis, and the like.

Fig. 4 is a schematic diagram of an embodiment of the method for simulating heavy oil reservoir steam channeling blocking and adjusting based on microfluidics, where fig. 4 is a schematic diagram of the method for simulating heavy oil reservoir steam channeling blocking and adjusting based on microfluidics, and a system for simulating heavy oil reservoir steam channeling blocking and adjusting based on microfluidics as any one of the above may include the following steps:

s1: setting the temperature of the heating device as the formation temperature, and placing the etched transparent medium sheet on the heating device;

s2: injecting the thick oil into the oil storage device, utilizing a first displacement device to displace a saturated oil sample in the oil storage device to the injection part of the etched transparent medium sheet, and starting an image acquisition device;

s3: injecting steam generated by the steam generating device into the etched transparent medium sheet by using a second displacement device until the water content of the output liquid reaches a preset threshold value;

s4: injecting a particle suspension liquid with the volume being a preset multiple of the pore volume into the etching transparent medium sheet by using the first displacement device to displace the particle suspension liquid storage device;

s5: injecting steam generated by the steam generating device into the etched transparent medium sheet by using the second displacement device again until the water content of the output liquid reaches a preset threshold value;

s6: recording the microscopic image, the injection speed and the injection time in the displacement process acquired by the image acquisition device by using the data acquisition and analysis device, and recording the water yield in the liquid production collection device;

s7: calculating different injection pore volume multiples by using the injection speed, the injection time and the total pore volume of the etched transparent medium sheet to obtain a relation curve of the injection speed and the injection pore volume multiples;

s8: calculating the recovery ratio by etching the total saturated oil quantity in the transparent medium sheet and the oil saturation ratios corresponding to different injection pore volume multiples to obtain a relation curve of the recovery ratio and the injection pore volume multiples, and analyzing the oil extraction effect of the blockage and adjustment of the steam channeling channel of the heavy oil reservoir;

s9: and calculating the water content by etching the total saturated oil quantity, the recovery ratio and the water yield in the transparent medium sheet to obtain a relation curve of the water content and the injection pore volume multiple.

The above method is described in detail below with a specific example:

(1) Counting the steam channeling dominant channel characteristics in the later thermal recovery period of the heavy oil reservoir, describing the heavy oil reservoir steam channeling dominant channel characteristics, designing a pore structure and data, drawing the pore structure of the steam channeling characteristic in CAD software, and manufacturing a microscopic displacement model reflecting the heavy oil reservoir steam channeling channel by a photoetching technology, namely etching a glass sheet;

(2) Compounding the thickened oil according to the component content of the thickened oil and the viscosity of the stratum thickened oil, completing sample preparation when the error between the prepared thickened oil viscosity and the viscosity of the stratum thickened oil is measured to be not more than 5%, and injecting the prepared thickened oil into an oil storage pool;

(3) Placing the etched glass sheet on a temperature-controllable heating plate, and setting the temperature of the temperature-controllable heating plate (0-200 ℃) as the formation temperature (80 ℃);

(4) Starting a micro displacement pump, opening a multi-way valve connected with an oil storage device, driving the oil storage device at a constant speed to etch a saturated oil sample in the glass sheet, wherein the displacement pressure can be 0.5MPa, observing the saturated oil condition of pores in the etched glass sheet through an electron microscope, stopping the injection of the pump after the pores in the etched glass sheet are completely saturated with oil, closing the multi-way valve, and simultaneously recording the amount of the saturated oil;

(5) Opening a multi-way valve of a steam generator, setting the temperature of the steam generator at about 200 ℃ to generate steam, injecting the steam into the etched glass sheets through the steam generator at the pressure of 30mbar, recording the distribution condition, steam injection speed and injection time of the viscous oil in the microscopic glass sheets through a computer in the displacement process, simultaneously recording the oil yield and water yield of the test tubes injected at different times, stopping injecting the steam when the water content of the produced liquid reaches 98%, and closing the multi-way valve;

(6) Opening a multi-way valve connected with a particle suspension storage device, displacing the particle suspension storage device at a pressure of 30mbar, recording particle blocking characteristics, a thick oil distribution state, an injection steam speed and injection time in a microscopic glass sheet by a computer in the displacement process, simultaneously recording oil yield and water yield in a test tube injected at different times, stopping pump injection after injecting particle suspension with 0.5 time pore volume into an etched glass sheet, and closing a micro-flow displacement pump and the multi-way valve;

(7) Opening a multi-way valve of a steam generator, injecting steam into the etched glass sheet at a constant pressure of 30mbar, recording the distribution condition of thick oil in the microscopic glass sheet, the steam injection speed and the steam injection time through a computer in the displacement process, simultaneously recording the oil yield and the water yield in test tubes injected at different times, stopping the experiment when the water content of the produced liquid reaches 98%, and cleaning and drying an experiment container and pipelines by using deionized water and nitrogen;

(8) Recording a microscopic image, an injection speed and an injection time of the displacement process through a computer connected with an electron microscope and a trace displacement pump, and recording the water yield in the test tube;

(9) Obtaining the blocking state of particles in a steam channeling channel and the distribution condition of residual oil through a microscopic image obtained in an experimental process, as shown in fig. 5, fig. 5 is a block and adjustment effect diagram of the particles in the steam channeling channel of a heavy oil reservoir, and it can be seen that after the particles in a particle suspension are used for blocking a steam channeling dominant channel (a circled part), subsequent steam is diverted to an unswept area, so that the output degree of the heavy oil can be improved, and meanwhile, the oil saturation degree of the microscopic image in the experimental process is analyzed by utilizing Photoshop and MATLAB software to obtain the residual oil saturation degree under different injection pore volume multiples in an etched glass sheet;

(10) Calculating the volume multiples of different injection pores through the injection speed, the injection time and the total pore volume of the etched glass sheet, and drawing a relation curve of the injection speed and the volume multiples of the injection pores, as shown in fig. 6, wherein fig. 6 is a schematic diagram of the relation curves of the injection speed, the water content and the recovery ratio under different injection pore volume multiples;

(11) Calculating the recovery ratio by etching the total saturated oil quantity in the glass sheet and the oil saturation ratio corresponding to different injection pore volume multiples, drawing a relation curve of the recovery ratio and the injection pore volume multiples, and obtaining the oil extraction effect of the heavy oil reservoir steam channeling channel blocking and adjusting technology as shown in the same figure 6;

(12) The water content was calculated from the total saturated oil content, the recovery factor and the water yield of the test tube in the etched glass sheet, and a curve was drawn relating the water content to the multiple of the injected pore volume, as also shown in fig. 6.

In conclusion, the system and the method solve the problems existing in the particle plugging profile control process after steam channeling of the thickened oil reservoir is simulated in the current experiment, improve the experiment simulation precision, simplify the experiment operation process, greatly shorten the experiment period, reduce the consumption of experiment samples, and can directly observe the plugging and profile control process and the plugging and profile control effect of steam and plugging agent particles, thereby better simulating the experimental research of the particle plugging profile control after steam channeling of the thickened oil reservoir.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a system based on stifled accent is scurried to micro-fluidic simulation viscous crude oil reservoir steam, its characterized in that has two sculpture transparent medium pieces that are used for reflecting the pore structure of steam scurring dominant channel including setting up the centre on heating device, the injection site of sculpture transparent medium piece is connected with steam generation device, oil storage device and granule suspension storage device, oil storage device with granule suspension storage device's the other end is connected to first displacement device jointly, steam generation device's the other end is connected to second displacement device, the position of producing oil of sculpture transparent medium piece is connected with and produces liquid collection device and the top and is provided with image acquisition device, image acquisition device with heating device electricity is connected to data acquisition analytical equipment jointly.

2. The system for simulating heavy oil reservoir steam channeling plugging and adjusting based on micro-fluidic according to claim 1, wherein a pressure sensor is further arranged at the front end of the injection part of the etched transparent medium sheet, and the pressure sensor is electrically connected with the data acquisition and analysis device.

3. The system for simulating heavy oil reservoir steam channeling, blocking and adjusting based on micro-fluidic according to claim 1, wherein a flow sensor is further arranged at the front end of the injection part of the etching transparent medium sheet, and the flow sensor is electrically connected with the data acquisition and analysis device.

4. The system for simulating heavy oil reservoir steam channeling plugging and adjusting based on microfluidics according to claim 1, wherein the image acquisition device is an electron microscope.

5. The system for simulating heavy oil reservoir steam channeling plugging and adjusting based on micro-fluidic according to claim 4, further comprising a light source device arranged facing the etched transparent medium sheet.

6. The system for simulating heavy oil reservoir steam channeling plugging and adjusting based on micro-fluidic of claim 1, wherein the transparent etching medium sheet is an etching glass sheet.

7. The system for simulating heavy oil reservoir steam channeling plugging and adjusting based on microfluidics according to claim 1, wherein the first displacement device comprises a micro displacement pump and a micro compressor, the micro displacement pump is communicated with the oil storage device and the particle suspension storage device, and the micro compressor is connected with the other end of the micro displacement pump.

8. The system for simulating heavy oil reservoir steam channeling and blocking and adjusting based on micro-fluidic system of claim 1, wherein the second displacement device is a high-precision displacement pump.

9. The system for simulating heavy oil reservoir steam channeling plugging and adjusting based on microfluidics according to claim 1, wherein the heating device is a heating plate which can be set to the temperature of the stratum.

10. A method for simulating heavy oil reservoir steam channeling blocking and adjusting based on microfluidics, which is characterized in that the system for simulating heavy oil reservoir steam channeling blocking and adjusting based on microfluidics as claimed in any one of claims 1 to 9 is utilized, and comprises the following steps:

setting the temperature of the heating device to be the formation temperature, and placing the etching transparent medium sheet on the heating device;

injecting thick oil into the oil storage device, utilizing the first displacement device to displace the oil storage device to saturate an oil sample in the injection part of the etched transparent medium sheet, and starting the image acquisition device;

injecting the steam generated by the steam generating device into the etched transparent medium sheet by using the second displacement device until the water content of the produced liquid reaches a preset threshold value;

displacing the particle suspension storage device by using the first displacement device to inject particle suspension with the volume being a preset multiple of the pore volume into the etching transparent medium sheet;

injecting the steam generated by the steam generating device into the etched transparent medium sheet by using the second displacement device again until the water content of the produced liquid reaches a preset threshold value;

recording a microscopic image, an injection speed and an injection time in the displacement process acquired by the image acquisition device by using the data acquisition and analysis device, and recording the water yield in the liquid production collection device;

calculating different injection pore volume multiples by using the injection speed, the injection time and the total pore volume of the etched transparent medium sheet to obtain a relation curve of the injection speed and the injection pore volume multiples;

calculating the recovery ratio by etching the total saturated oil quantity in the transparent medium sheet and the oil saturation ratios corresponding to different injection pore volume multiples to obtain a relation curve of the recovery ratio and the injection pore volume multiples, and analyzing the oil extraction effect of the blockage and adjustment of the steam channeling channel of the heavy oil reservoir;

and calculating the water content by etching the total saturated oil quantity, the recovery ratio and the water yield in the transparent medium sheet to obtain a relation curve of the water content and the injection pore volume multiple.

Images