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

Abstract

This application discloses a system for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidics, which includes two etched transparent dielectric sheets with a pore structure for reflecting the dominant channel of steam channeling arranged on the heating device, The injection part of the 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 which are connected to the first displacement device, and the other end of the steam generation device is connected to the second displacement device , the oil outlet part of the etched transparent medium sheet is connected with a production liquid collection device and an image acquisition device is arranged above it, and the image acquisition device and the heating device are electrically connected to the data acquisition and analysis device. The plugging adjustment process and oil recovery effect of steam and plugging agent particles after steam channeling in oil reservoirs can further explore the development potential of heavy oil reservoirs after steam channeling, and the simulation accuracy is higher. The application also discloses a method for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidics.

Description

A system and method for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidics

technical field

The invention belongs to the technical field of heavy oil reservoir development, in particular to a system and method for simulating heavy oil reservoir steam channeling and blockage adjustment based on microfluidic control.

Background technique

The heavy oil resources in the world are extremely rich, and heavy oil has also become an important part of my country's crude oil production. In the utilization of heavy oil resources, the heavy components in heavy oil are often used to refine high-end lubricating oil, high-grade asphalt and refrigeration oil and other substances. In the case of increasingly prominent international energy conflicts, the vigorous development of heavy oil resources meets the needs of my country's economy, energy and strategic security.

Due to the high viscosity of heavy oil, steam injection is usually used to exploit heavy oil reservoirs, among which steam stimulation is the most widely used thermal recovery development method for heavy oil. After multiple rounds of steam stimulation, steam flooding is the main method. alternative development method. Due to the heterogeneity within or between layers of heavy oil reservoirs, unreasonable steam injection parameters, or steam overlay, in the later stage of thermal recovery of heavy oil reservoirs, channeling between wells develops, resulting in steam or hot water The sweep efficiency is reduced, causing a large amount of remaining oil to remain in the formation. In order to further improve the recovery factor, effectively blocking the dominant channels of steam channeling has become an important means to improve the development effect of heavy oil reservoirs in the later stage of steam development.

In the prior art, an experimental system and method for evaluating heavy oil recovery by air-foam assisted steam flooding is used in the simulation study of steam channeling and blockage regulation in heavy oil reservoirs. The experiment is carried out by using the parallel sand-packing tube experimental device, as shown in Fig. 1, Fig. 1 is a schematic structural diagram of an experimental system for evaluating the production of heavy oil by air foam assisted steam flooding in the prior art, which includes an air bottle 21, a dryer 22, a gas flow measurement and control device 23, a one-way valve 24, a A 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, third precision pressure gauge 214, injection pipeline 215 with heating device, first beaker 217, second beaker 219, first output heating pipeline 41, third back pressure valve 42, fourth precision pressure Table 43, the first jar with cork 44, the first gas sample sampling bag 45, the second output heat tracing pipeline 46, the fourth back pressure valve 47, the fifth precision pressure gauge 48, the second cork Wide-mouth bottle 49, second gas sample sampling bag 410, data acquisition device 3 include data acquisition and transmission equipment 31, computer 32, power supply 33, rock core device 1A, first rock core 16, second rock core 16A, connection equipment 162, The first sand filling pipe 161 and the second sand filling pipe 167 . The experimental system and method can better evaluate the profile control effect of injected media after steam channeling in heavy oil reservoirs, but the experimental system and method cannot allow people to observe particle plugging after steam channeling in heavy oil reservoirs at the pore scale At the same time, in this traditional physical simulation of sand filling pipes, there are disadvantages such as long experimental period, heavy workload of personnel and large consumption of samples.

Contents of the invention

In order to solve the above problems, the present invention provides a system and method for simulating steam channeling and blocking adjustment in heavy oil reservoirs based on microfluidics, which allows experimenters to observe steam and plugging agent particles after steam channeling in heavy oil reservoirs at the pore scale The plugging and adjustment process and oil recovery effect can make people understand and evaluate the plugging and adjustment process and plugging effect of plugging agent particles in heavy oil reservoirs in the later stage of thermal recovery development, and further explore the development potential of heavy oil reservoirs after steam channeling. Moreover, the simulation accuracy is higher, the operation is simpler, the experiment cycle is shorter, and the sample consumption is less.

The present invention provides a system for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidic control, which includes two etched transparent dielectric sheets with a pore structure for reflecting the dominant channel of steam channeling arranged on the heating device, The injection part of the etched transparent medium sheet is connected with a steam generating device, an oil storage device and a particle suspension storage device, and the other end of the oil storage device and the particle suspension storage device are jointly connected to the first displacement device , the other end of the steam generating device is connected to the second displacement device, the oil production part of the etched transparent medium sheet is connected to a production fluid collection device and an image acquisition device is arranged above, the image acquisition device and the The heating device is commonly electrically connected to the data acquisition and analysis device.

Preferably, in the above-mentioned system based on microfluidic simulation of steam channeling and blockage adjustment in heavy oil reservoirs, a pressure sensor is also provided at the front end of the injection site of the etched transparent medium sheet, and the pressure sensor is connected with the data acquisition and analysis The device is electrically connected.

Preferably, in the above-mentioned system based on microfluidic simulation of steam channeling and blockage adjustment in heavy oil reservoirs, a flow sensor is also provided at the front end of the injection site of the etched transparent medium sheet, and the flow sensor is connected with the data acquisition and analysis The device is electrically connected.

Preferably, in the above microfluidic-based system for simulating steam channeling and blockage regulation in heavy oil reservoirs, the image acquisition device is an electron microscope.

Preferably, in the above-mentioned system for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidics, it further includes a light source device arranged facing the etched transparent medium sheet.

Preferably, in the above-mentioned system for simulating heavy oil reservoir steam channeling blockage adjustment based on microfluidics, the transparent etching medium sheet is an etching glass sheet.

Preferably, in the above-mentioned system based on microfluidic simulation of steam channeling and blockage adjustment in heavy oil reservoirs, the first displacement device includes a micro-displacement device that is both connected to the oil storage device and the particle suspension storage device. pump and a micro-compressor connected to the other end of the micro-displacement pump.

Preferably, in the above-mentioned system based on microfluidic control to simulate heavy oil reservoir steam channeling blockage adjustment, the second displacement device is a high-precision displacement pump.

Preferably, in the above-mentioned system for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidics, the heating device is a heating plate that can be set to the formation temperature.

The present invention provides a method for simulating steam channeling and blockage adjustment in heavy oil reservoirs based on microfluidics, using the system for simulating steam channeling and blockage adjustment in heavy oil reservoirs based on microfluidics as described in any one of the above, including:

Setting the temperature of the heating device to the formation temperature, placing the etched transparent dielectric sheet on the heating device;

Inject heavy oil into the oil storage device, use the first displacement device to displace the oil storage device to saturate the injection site of the etched transparent medium sheet with oil samples, and turn on the image acquisition device;

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

Using the first displacement device to displace the particle suspension storage device and inject a particle suspension whose volume is a preset multiple of the pore volume into the etched transparent medium sheet;

Using the second displacement device again to inject the steam generated by the steam generating device into the etched transparent medium sheet, and stop until the water content of the produced fluid reaches a preset threshold;

Using the data acquisition and analysis device to record the microscopic images, injection speed and injection time collected by the image acquisition device during the displacement process, and record the water production in the production liquid collection device;

Using the injection rate, the injection time and the total pore volume of the etched transparent medium sheet to calculate different injection pore volume multiples to obtain a relationship curve between injection rate and injection pore volume multiple;

The recovery factor is calculated by etching the total saturated oil in the transparent medium sheet and the oil saturation corresponding to different injection pore volume multiples, and the relationship curve between the recovery factor and the injection pore volume multiple is obtained to analyze the channel blockage of steam channeling in heavy oil reservoirs Tuned oil production effect;

The water cut is calculated by etching the total saturated oil, recovery factor and water production in the transparent medium sheet, and the relationship curve between the water cut and the injection pore volume multiple is obtained.

It can be seen from the above description that the above-mentioned system for simulating heavy oil reservoir steam channeling blockage adjustment based on microfluidic control provided by the present invention includes two engraved pore structures arranged on the heating device in the middle to reflect the dominant channel of steam channeling. etched transparent dielectric sheet, the injection site of the etched transparent dielectric sheet is connected with a steam generating device, an oil storage device and a particle suspension storage device, and the other end of the oil storage device and the particle suspension storage device are commonly connected to The first displacement device, the other end of the steam generating device is connected to the second displacement device, the oil production part of the etched transparent medium sheet is connected to a production liquid collection device and an image acquisition device is arranged above, and the image The acquisition device and the heating device are electrically connected to the data acquisition and analysis device, so that the experimenter can observe the plugging adjustment process and oil recovery effect of steam and plugging agent particles after steam channeling in heavy oil reservoirs at the pore scale, which makes people more in-depth To understand and evaluate the plugging and adjustment process and effect of plugging agent particles in heavy oil reservoirs in the later stage of thermal recovery and development, and further explore the development potential of heavy oil reservoirs after steam channeling, and the simulation accuracy is higher, the operation is simpler, and the experimental period Shorter and less sample consumption. The invention also provides a method for simulating heavy oil reservoir steam channeling blockage adjustment based on microfluidic control, which has the same advantages as the above system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is the schematic structural diagram of the experimental system for evaluating the recovery of heavy oil by air foam assisted steam flooding in the prior art;

2 is a schematic diagram of an embodiment of a system for simulating heavy oil reservoir steam channeling blockage adjustment based on microfluidics provided by the present invention;

Fig. 3 is a schematic diagram of a specific embodiment of a system based on microfluidic simulation of steam channeling blockage regulation in heavy oil reservoirs;

Fig. 4 is a schematic diagram of an embodiment of a method for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidics provided by the present invention;

Fig. 5 is an effect diagram of particle blockage and adjustment of steam channeling channels in heavy oil reservoirs;

Fig. 6 is a schematic diagram of the relationship curves of injection velocity, water cut and recovery factor under different injection pore volume multiples.

Detailed ways

The core of the present invention is to provide a system and method for simulating steam channeling blockage adjustment in heavy oil reservoirs based on microfluidic control, which allows experimenters to observe the blockage adjustment of steam and plugging agent particles after steam channeling in heavy oil reservoirs at the pore scale The process and oil recovery effect allow people to have a deeper understanding and evaluation of the plugging and adjustment process and effect of plugging agent particles in heavy oil reservoirs in the later stage of thermal recovery development, and further explore the development potential of heavy oil reservoirs after steam channeling, and the simulation accuracy Higher, simpler operation, shorter experimental cycle, and less sample consumption.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of a system for simulating steam channeling and blockage adjustment in heavy oil reservoirs based on microfluidics provided by the present invention is shown in Figure 2, and Figure 2 is a system for simulating steam channeling in heavy oil reservoirs based on microfluidics provided by the present invention The schematic diagram of the embodiment of the tuned system, the system can include two etched transparent dielectric sheets 2 with a pore structure for reflecting the dominant channel of steam channeling arranged on the heating device 1, and the injection of the etched transparent dielectric sheets 2 The parts are connected with a steam generating 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 can be fixed by a fixing plate, and the oil storage device 4 and the particle suspension storage device The other end of 5 is commonly connected to the first displacement device 6, the other end of the steam generating device 3 is connected to the second displacement device 7, and the oil outlet part of the etched transparent medium sheet 2 is connected to the production liquid collection device 8 and is set above There is an image acquisition device 9, the lens of the image acquisition device 9 can directly etch the transparent medium sheet 2, the liquid production collection device 8 can be a test tube fixed on the test tube holder, the image acquisition device 9 and the heating device 1 are in common It is electrically connected to the data acquisition and analysis device 10 .

It should be noted that the above-mentioned embodiment is a microscopic visualization system, and the working process of this system can be as follows: place the etched transparent medium sheet 2 on the heating device 1, and set it to the formation temperature; prepare heavy oil and particle suspension saturated heavy oil into the etched transparent medium sheet 2; inject steam into the etched transparent medium sheet 2 to form a steam channel, inject particle suspension to block the steam channel, and then inject steam to divert to the unswept oil area, which can drive Replace until the water cut is 98%, record the image, injection speed and injection time of the displacement process by connecting the data acquisition and analysis device 10 of the image acquisition device 9, and record the oil production and water production of the test tube; draw the injection speed, water cut, The relationship curve between the recovery factor and the injection pore volume multiple; the oil recovery effect of the steam channeling channel plugging and adjustment technology in the heavy oil reservoir is obtained.

From the above description, it can be seen that in the embodiment of the system for simulating steam channeling blockage adjustment based on microfluidic control in heavy oil reservoirs provided by the present invention, due to the pore structure provided in the middle of the heating device for reflecting the dominant channel of steam channeling Two etched transparent dielectric sheets, the injection part of the etched transparent dielectric sheet is connected with a steam generating device, an oil storage device and a particle suspension storage device, and the other ends of the oil storage device and the particle suspension storage device are connected to the first Displacement device, the other end of the steam generating device is connected to the second displacement device, the oil outlet part of the etched transparent medium sheet is connected to a liquid production collection device and an image acquisition device is arranged above, and the image acquisition device and the heating device are electrically connected To the data acquisition and analysis device, so that the experimenter can observe the blockage adjustment process and oil recovery effect of steam and plugging agent particles after steam channeling in heavy oil reservoirs at the pore scale, so that people can have a deeper understanding and evaluation of heavy oil in the later stage of thermal recovery and development The blocking adjustment process and plugging adjustment effect of plugging agent particles in the reservoir further explore the development potential of heavy oil reservoirs after steam channeling, and the simulation accuracy is higher, the operation is simpler, the experiment period is shorter, and the sample consumption is less.

In a specific embodiment of the above-mentioned system for simulating steam channeling and blocking adjustment in heavy oil reservoirs based on microfluidics, refer to Figure 3, which is a specific implementation of the system for simulating heavy oil reservoirs for steam channeling and blocking adjustment based on microfluidics In the schematic diagram of an example, the front end of the injection site of the above-mentioned etched transparent dielectric sheet 2 can also be provided with a pressure sensor 11, and the pressure sensor 11 is electrically connected to the data acquisition and analysis device 10, so that the distance between the pressure sensor 11 and the etched transparent dielectric sheet 2 More recently, the pressure during the injection process can be measured more accurately in real time, and the collected pressure data can be transmitted to the data acquisition and analysis device 10 in real time. Moreover, the front end of the injection site of the etched transparent dielectric sheet 2 can also be provided with a flow sensor 12, and the flow sensor 12 is electrically connected to the data acquisition and analysis device 10, so that the flow sensor 12 is also arranged closer to the etched transparent dielectric sheet 2 , the flow rate during the injection process can be measured more accurately in real time, and the collected flow data can be transmitted to the data acquisition and analysis device 10 in real time.

Continuing to refer to Fig. 3, the above-mentioned image acquisition device 9 can preferably be an electron microscope. It should be noted that this electron microscope can directly observe the structure of the sample surface, the size of the sample can be as large as 120mm × 80mm × 50mm, and the sample preparation process is simple. The sample can be translated and rotated in three dimensions in the sample chamber without cutting into thin slices. Therefore, the sample can be observed from various angles. The depth of field is large and the image is full of three-dimensionality. The depth of field of the scanning electron microscope is hundreds of times larger than that of the optical microscope. times, dozens of times larger than the transmission electron microscope, the magnification range of the image is wide, and the resolution is relatively high, which can be magnified by more than ten times to hundreds of thousands of times. The resolution is between the optical microscope and the transmission electron microscope, up to 3nm. The damage and contamination of the sample by the electron beam are small. While observing the morphology, other signals from the sample can also be used for micro-component analysis. Further, it may also include a light source device 13 arranged facing the etched transparent dielectric sheet 2, and the light source device 13 can assist in illuminating the etched transparent dielectric sheet 2 to make it brighter, so that the image acquisition device 9 can capture more clearly It is easier to obtain the details in the image and make the analysis more accurate. The type of light source device used can be set according to actual needs, such as LED light source, etc., which is not limited here.

In another specific embodiment of the above-mentioned system based on microfluidic simulation of steam channeling and blockage adjustment in heavy oil reservoirs, the above-mentioned transparent etching medium sheet 2 may preferably be an etching glass sheet. It should be noted that this glass material can Higher temperature resistance, so used in this kind of heavy oil experiment, the experimental temperature range is wider, which can better simulate the real situation in the formation. Moreover, continuing to refer to FIG. 3 , the above-mentioned first displacement device 6 may include a micro-displacement pump 601 connected to the oil storage device 4 and the particle suspension storage device 5 and a micro-compressor connected to the other end of the micro-displacement pump 601. Machine 602, using this micro compressor and micro displacement pump can displace heavy oil and particle suspension into the transparent etching medium sheet 2, meeting the requirements of the simulation experiment. In addition, the above-mentioned second displacement device 7 may preferably be a high-precision displacement pump, which is more suitable for steam flooding of heavy oil, so that the displacement amount can be controlled more precisely, and thus more suitable for The steam is displaced into the above-mentioned transparent etching medium sheet 2 to meet the requirements of a more accurate simulation experiment. It should also be noted that the above-mentioned heating device 1 can be a heating plate that can be set to the temperature of the formation, so that the situation in the formation can be better simulated, the scene is more realistic, and the analysis results obtained are more in line with the actual situation. Of course, in addition to being In addition to the plate shape, other types of heating devices can also be used, which are not limited here.

It should also be noted that, continuing to refer to FIG. 3 , the multi-way valve 14 can be used for connection. Specifically, the multi-way valve 14 can be used to simultaneously connect the oil storage device 4, the particle suspension storage device 5, and the steam generating device. 3 and the entrance end of the transparent etching medium sheet 2, and the above-mentioned data collection and analysis device 10 can be a computer, which can simultaneously realize functions such as data collection, storage and analysis.

An embodiment of a method for simulating steam channeling and blockage adjustment in heavy oil reservoirs based on microfluidics provided by the present invention is shown in Figure 4, and Figure 4 is a method for simulating steam channeling in heavy oil reservoirs based on microfluidics provided by the present invention The schematic diagram of the embodiment of the method for adjusting, utilize as above any system based on microfluidic simulation heavy oil reservoir steam channeling plugging adjusting, can comprise the following steps:

S1: Set the temperature of the heating device to the formation temperature, and place the etched transparent dielectric sheet on the heating device;

S2: Inject heavy oil into the oil storage device, use the first displacement device to displace the oil storage device to saturate the oil sample into the injection part of the etched transparent medium sheet, and turn on the image acquisition device;

S3: using the second displacement device to inject the steam generated by the steam generating device into the etched transparent medium sheet, and stop until the water content of the produced fluid reaches the preset threshold;

S4: using the first displacement device to displace the particle suspension storage device to inject a particle suspension whose volume is a preset multiple of the pore volume into the etched transparent medium sheet;

S5: Use the second displacement device to inject the steam generated by the steam generating device into the etched transparent medium sheet, and stop until the water content of the produced fluid reaches the preset threshold;

S6: Use the data acquisition and analysis device to record the microscopic image, injection speed and injection time during the displacement process collected by the image acquisition device, and record the water production in the production liquid collection device;

S7: Calculate different injection pore volume multiples by using the injection velocity, injection time and the total pore volume of the etched transparent dielectric sheet, and obtain a relationship curve between the injection velocity and the injection pore volume multiple;

S8: Calculate the recovery factor by etching the total saturated oil in the transparent medium sheet and the oil saturation corresponding to different injection pore volume multiples, obtain the relationship curve between the recovery factor and the injection pore volume multiple, and analyze steam channeling in heavy oil reservoirs The oil production effect of channel blockage adjustment;

S9: Calculate the water cut by etching the total saturated oil, recovery factor and water production in the transparent medium sheet, and obtain the relationship curve between the water cut and the injection pore volume multiple.

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

(1) Statistically analyze the characteristics of the dominant channels of steam channeling in the late stage of thermal recovery of heavy oil reservoirs, characterize the characteristics of the dominant channels of steam channeling in heavy oil reservoirs, design the pore structure and data, use CAD software to draw the pore structure of steam channeling characteristics, and use optical Engraving technology to produce a microscopic displacement model that reflects the steam channeling channel in heavy oil reservoirs, that is, etching glass flakes;

(2) The heavy oil is compounded according to the component content of the heavy oil and the viscosity of the heavy oil in the formation. When the difference between the viscosity of the heavy oil prepared and the viscosity of the heavy oil in the formation is not more than 5%, the sample preparation is completed. into the oil reservoir;

(3) Place the etched glass sheet on a temperature-controllable heating plate, and set the temperature of the temperature-controllable heating plate (0 to 200°C) as the formation temperature (80°C);

(4) Start the micro-displacement pump, open the multi-way valve connected to the oil storage device, and displace the oil storage device at a constant speed to saturate the oil sample in the etched glass slice. The displacement pressure can be 0.5MPa. When the pores in the etched glass slice are completely saturated with oil, stop the pump injection, close the multi-way valve, and record the saturated oil amount at the same time;

(5) Open the multi-way valve of the steam generator, set the temperature of the steam generator at about 200°C to generate steam, and inject the steam into the etched glass sheet through the steam generator at a pressure of 30mbar. Record the distribution of heavy oil in the microscopic glass flakes, the steam injection speed and injection time, and record the oil production and water production in the test tube at different injection times. When the water content of the produced liquid reaches 98%, stop injecting steam and close the multi-channel valve;

(6) Open the multi-way valve connected to the particle suspension storage device, and displace the particle suspension storage device with a pressure of 30 mbar. During the displacement process, the computer records the particle plugging characteristics in the microscopic glass flakes, the distribution of heavy oil, and the injection Steam velocity and injection time, while recording the oil production and water production in the test tube at different injection times, after injecting 0.5 times the pore volume of the particle suspension into the etched glass slice, stop the pump injection, turn off the micro-flow displacement pump and multi-way valve;

(7) Open the multi-way valve of the steam generator, and then inject steam into the etched glass sheet at a constant pressure of 30 mbar. During the displacement process, the computer records the distribution of heavy oil in the microscopic glass sheet, the injected steam velocity and At the same time, record the oil production and water production in the test tube at different times, stop the experiment when the water content of the produced liquid reaches 98%, and use deionized water and nitrogen to clean and dry the experimental container and pipeline;

(8) Record the microscopic image, injection speed and injection time of the displacement process by connecting the electron microscope and the micro displacement pump computer, and record the water production in the test tube;

(9) Through the microscopic images obtained during the experiment, the plugging state of the particles in the steam channeling channel and the distribution of remaining oil are obtained, as shown in Figure 5, which is the effect diagram of particle blockage and adjustment of the steam channeling channel in heavy oil reservoirs, which can be used It can be seen that after the dominant channel of steam channeling (enclosed part) is blocked by the particles in the particle suspension, the subsequent steam will turn to the unswept area, thereby improving the heavy oil output. At the same time, using Photoshop and MATLAB The software analyzes the oil saturation of the microscopic pictures in the experimental process, and obtains the remaining oil saturation at different injection pore volume multiples in the etched glass sheet;

(10) Calculate different injection pore volume multiples based on injection velocity, injection time and total pore volume of etched glass flakes, and draw the relationship curve between injection velocity and injection pore volume multiple, as shown in Figure 6, which shows different injection pore volumes Schematic diagram of the relationship curve of injection rate, water cut and recovery factor under multiples;

(11) Calculate the recovery factor by etching the total saturated oil in the glass sheet and the oil saturation corresponding to different injected pore volume multiples, and draw the relationship curve between the recovery factor and the injected pore volume multiple, as shown in Figure 6, Obtain the oil recovery effect of steam channeling channel blocking and adjusting technology in heavy oil reservoir;

(12) Calculate the water cut by etching the total saturated oil in the glass slice, the recovery factor and the water production of the test tube, and draw the relationship curve between the water cut and the injection pore volume multiple, as shown in Figure 6.

In summary, the above system and method solves the problems existing in the experimental simulation of particle plugging and flooding after steam channeling in heavy oil reservoirs, improves the accuracy of experimental simulation, simplifies the experimental operation process, and greatly shortens the experimental cycle , reducing the consumption of experimental samples, and through this method, the plugging and regulating process and effect of steam and plugging agent particles can be directly observed, which can better simulate the experimental research of particle plugging and regulating after steam channeling in heavy oil reservoirs.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not 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.

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