CN117662100A - Fractured reservoir plugging control system and method of magnetic microspheres under multiple magnetic control - Google Patents
Fractured reservoir plugging control system and method of magnetic microspheres under multiple magnetic control Download PDFInfo
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Abstract
The invention discloses a fractured reservoir plugging system and method for magnetic microspheres under multiple magnetic control, belonging to the technical field of oil and gas field development engineering. Based on the method, a fractured reservoir plugging method of the multi-magnetic field controllable magnetic expansion microsphere is established, firstly, parameters such as reservoir conditions, target fracture morphology, distribution, structure and the like are analyzed, and then the magnetic microsphere with physical property parameters matched is determined; and then injecting the magnetic microspheres into a water well through a microsphere injection system, combining a data processing and imaging subsystem, guiding the magnetic microspheres into a target crack through a constant magnetic field control subsystem, and completing expansion plugging adjustment of the magnetic microspheres through an alternating magnetic heat control subsystem. The invention solves the problem of accurate plugging adjustment of the cracks between wells, can effectively adjust and use the residual oil between the injection and production well groups, improves the sweep efficiency, and further improves the recovery ratio.
Description
Technical Field
The invention relates to a fractured reservoir plugging method, device and system based on multiple magnetic field controllable magnetic expansion microspheres, and belongs to the technical field of oil and gas field development engineering.
Background
The traditional/conventional plugging control method mainly comprises the following steps: mechanical, physical and chemical methods, wherein: the mechanical method is to plug the ultra-high water absorption layer section or the flow-limiting perforation by a packer; the physical method is to plug the high permeability layer section by solid particles, jelly or foam and the like; the chemical method adopts a method that a solidification chemical agent reacts chemically in the stratum to carry out plugging. The plugging agents commonly used in the oil and gas reservoirs at present mainly comprise particle plugging agents, curing plugging agents and gel plugging agents, wherein the particle plugging agents have the defect of difficult control of migration. The limitation of the curing plugging agent is that the reaction speed is high, the reaction is not easy to control, and the problem of simultaneously plugging oil and water layers is easily caused. The gel plugging agent has limited plugging effect on the oil well with high mineralization degree.
The magnetic expansion microsphere is a synthesized nano-micron particle with magnetism and volume response, generally consists of an expansion material and magnetic particles, has good water solubility and can enter a target layer along with water injection. In addition, the movement of the magnetic expansion microspheres can be controlled by magnetic force, the magnetic expansion microspheres can be controlled to reach the region where the formation fracture needs to be blocked by externally applying a magnetic field, and after the target position is reached, the magnetic expansion microspheres are subjected to magnetic thermal expansion by applying an alternating magnetic field, so that the problems of selective blocking, accurate blocking and efficient intelligent profile control in a target layer can be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a fractured reservoir plugging control method and system based on multiple magnetic field controllable magnetic expansion microspheres.
The technical scheme of the invention is as follows:
a fractured reservoir plugging control system based on multiple magnetic field controllable magnetic expansion microspheres, comprising: the system comprises a microsphere injection subsystem, a data acquisition subsystem, a data processing and imaging subsystem, a constant magnetic field control subsystem and an alternating magnetic heat control subsystem;
the microsphere injection subsystem comprises a water tank, a material tank and a mixing room, wherein the water tank is connected to the mixing room through a water tank conveying pipeline, the material tank is connected to the mixing room through a microsphere conveying pipeline, injected water is clean water treated by a water supply station, magnetic expansion microspheres manufactured according to functional requirements are stored in the material tank, a switch and a flow valve are arranged on the water tank conveying pipeline, a switch and a metering valve are arranged on the microsphere conveying pipeline, the mixing proportion of the water and the magnetic expansion microspheres is adjusted through the water injection flow valve and the microsphere metering valve respectively, the mixing room is connected to a water injection well shaft through an output pipeline, a booster pump is arranged on the output pipeline, and the water and the magnetic expansion microspheres enter the mixing room according to a certain volume proportion to be mixed to form injection liquid, and then enter the pressurized injection construction;
the data acquisition subsystem comprises a magnetic field measuring device which is arranged in a shaft near a target fracture; the magnetic field measuring device can be placed in a production well or a shaft near the production well, the production is not started during the measurement, the purpose is to move the magnetic expansion microspheres to a target position, and whether the microspheres reach the target position or not is determined through the measuring device; preferably, the magnetic field measuring device employs a superconducting quantum interferometer.
The data processing and imaging subsystem comprises a data acquisition card, a data processing module and a data imaging display module, wherein the data acquisition card is connected with the magnetic field measuring device and the data processing module through communication lines, the data processing module adopts inversion algorithm to calculate and obtain the sweep range of the magnetic expansion microsphere, and the data imaging display module is used for displaying data results;
the constant magnetic field control subsystem is connected with the data processing and imaging subsystem through a communication line, the constant magnetic field control subsystem comprises an operation control unit, a signal amplifying unit and a constant power output unit which are mutually connected, the operation control unit is connected with the data processing and imaging subsystem so as to receive control signals, the constant power output unit is connected with the magnetic field generating device through a control line, a switch is arranged on the control line, and the magnetic field direction and intensity are adjusted according to the current magnetic expansion microsphere sweep range imaging information until the magnetic expansion microsphere enters the target crack to be comprehensively distributed; preferably, the magnetic field generating device comprises a weak magnetic generating device and a strong magnetic generating device, wherein the weak magnetic generating device is arranged in the target stratum well bore of the injection well, and the strong magnetic generating device is arranged in the target stratum well bore of the production well;
the alternating magnetic heating control subsystem is connected with the data processing and imaging subsystem through a communication line, the alternating magnetic heating control subsystem comprises an operation control unit, a variable frequency control unit and an alternating power output unit which are mutually connected, the operation control unit is connected with the data processing and imaging subsystem so as to receive control signals, the alternating power output unit is connected with the magnetic field generating device through a control line, a switch is arranged on the control line, the magnetic field generating device is a coil, alternating current and direct current are respectively supplied, and the aims of constant magnetic field traction and alternating magnetic field heating can be achieved in different time periods. The constant and alternating are connected to the magnetic field generator, and the action of the magnetic field is selected by the on-off of the switch.
Preferably, the ground is provided with a ground resistance-capacitance controller, the magnetic field generating device is connected with the ground resistance-capacitance controller, and the ground resistance-capacitance controller is used for controlling the intensity and frequency of the generated magnetic field. By varying the values of the capacitor and resistor and a constant, alternating selection to adjust the strength and frequency of the alternating magnetic field, the heating process can be precisely controlled, ensuring that precise temperature control is provided when needed.
Preferably, the magnetic expansion microsphere comprises a two-layer core-shell structure, wherein the shell is thermoplastic acrylic polymer, and the core layer is alkane gas and magnetic Fe with ultra-small particle size 4 O 3 The spherical plastic particles composed of nano particles, preferably, the ultra-small particle size is 2-5 nanometers. The temperature range under the control of magnetocaloric is 50-150 ℃, the expansion multiplying power of the microsphere volume can reach 5-10 times, and the expansion can be completed according to the requirements of various expansion rangesAnd (3) synthesis of microspheres.
Preferably, a sampling box and a switch are arranged between the mixing room and the booster pump, and a metering valve, a switch and an electromagnetic flow valve are arranged on a pipeline between the booster pump and the water injection well shaft. And the device is used for controlling the on-off of the pipeline.
A plugging method of a fractured reservoir plugging system based on multiple magnetic field controllable magnetic expansion microspheres adopts the system and injection medium, and comprises the following specific steps:
step 1: analysis of reservoir conditions, fracture parameters and synthesis of caulking microsphere materials
Firstly, representing parameters of the occurrence, distribution, width and opening of a target fracture of an oil reservoir based on data of an earthquake, a well logging, a core and a slice, and constructing a three-dimensional fracture model; then, quantifying the range and the volume of the plugged target crack by a target carving and volume method, and further combining the distribution and the size of the magnetic expansion microspheres, so that the dosage of the magnetic expansion microspheres can be calculated; in order to achieve a better plugging effect, when the single layer in the crack is filled with the magnetic expansion microspheres, the diameter of the expanded magnetic expansion microspheres can reach the maximum opening of the target crack;
step 2: arrangement construction site and foundation magnetic field measurement
Five systems are arranged around the ground of the target well group in a coordinated manner: the system comprises a microsphere injection subsystem, a data acquisition subsystem, a data processing and imaging subsystem, a constant magnetic field control subsystem and an alternating magnetic heat control subsystem; starting a magnetic field measuring device in a well bore of a production well, and measuring an initial background magnetic field; then starting a magnetic field generating device in the water injection well, measuring a low flux external magnetic field by using a magnetic field measuring device, and then closing the magnetic field generating device;
step 3: injection liquid mixing
The injection water is connected with the mixing room through a water tank conveying pipeline, the material tank is connected with the mixing room through a microsphere conveying pipeline, the injection water is clean water after being treated by a water supply station, the material tank stores magnetic expansion microspheres synthesized according to functional requirements, the mixing proportion of the water and the magnetic expansion microspheres is adjusted through a flow valve and a metering valve respectively, and preferably, the mixing proportion of the water and the magnetic expansion microspheres is 3:1, mixing the mixture in a mixing room to form injection;
step 4: magnetic expansion microsphere mixed liquid injection construction
Pressurizing injection liquid by a booster pump, constructing, starting a magnetic field generating device in a water injection well, and measuring disturbance magnetic field data of the injected magnetic expansion microsphere injection liquid in real time by using a magnetic field measuring device;
step 5: magnetic field data acquisition processing and microsphere migration monitoring
The magnetic field distribution in the space around the position can be changed after the magnetic expansion microsphere is injected, so that magnetic field abnormality is generated. Transmitting the initial background magnetic field measured in the step 2, the low-flux external magnetic field and the disturbance magnetic field data measured in the step 4 to a data acquisition subsystem, a data processing and imaging subsystem through a communication line to obtain magnetic field intensity data in the monitoring areas x, y and z, and solving the Laplacian equation of the disturbance magnetic field by a finite element method to obtain the sweep range of the magnetic expansion microsphere; the distribution of the magnetic expansion microspheres is imaged on the ground of the well group in real time, and the distribution of the magnetic microspheres can be continuously monitored through inversion results in real time until the magnetic expansion microspheres enter the target cracks to be comprehensively distributed;
step 6: applying a constant magnetic field to guide the magnetically expandable microspheres into the fracture
On the basis of inverting the sweep range of the magnetic expansion microspheres in the step 5, adopting imaging information of the sweep range of the magnetic expansion microspheres to automatically identify the area which is not swept by the magnetic expansion microspheres in the target fracture, then opening a magnetic field generating device in a production well, setting the magnetic field strength, and adjusting the depth of the magnetic field generating device through a preset controller to guide the magnetic expansion microspheres to enter the target fracture plugging area which is not swept;
if the magnetic field generating device (more than 2 wells) is arranged in the multi-well, the guiding direction of the magnetic force can be controlled by the cooperation of the multi-well (comprising three types of magnetic field generating device switch adjustment, magnetic field intensity adjustment of each device and depth adjustment of the magnetic field generating device).
The magnetic field force of the magnetic expansion microsphere in the magnetic field is as follows:
（1）
in the middle ofIs the volume of the magnetic expansion microsphere, +.>Is of vacuum permeability->Is the magnetization of the magnetic expansion microsphere, +.>Is a magnetic field gradient;
step 7: applying an alternating magnetic field, and magnetically expanding the magnetic thermal expansion caulking of the magnetic expansion microsphere
An alternating magnetic heat control subsystem is started, an alternating magnetic field is applied to a stratum target plugging position, the heating process can be accurately controlled according to a magnetic expansion microsphere expansion curve, accurate temperature control is ensured to be provided when needed, a preset expansion volume is reached, and then plugging of a crack area is achieved; the expansion curve is a relation curve of temperature obtained by microsphere thermal expansion experiments and microsphere expansion multiplying power,
wherein, the alternating magnetic field is generated by alternating current electromagnet, and the heating power of the magnetic expansion microsphere in the alternating magnetic field is:
（2）
in the method, in the process of the invention,to balance magnetic susceptibility>For maximum field strength at the peak +.>For alternating magnetic field frequency>Is the effective relaxation time;
the expansion constitutive equation of the magnetic expansion microsphere temperature control is as follows:
（3）
in the method, in the process of the invention,is expansion strain->Temperature, < >>Is the reference temperature, +.>，/>，/>Is a temperature dependent coefficient equation;
step 8: after plugging is completed, the production well is opened for production, the plugging effect is evaluated, the production dynamics before and after plugging is tracked, optimized and compared, the effect of the magnetic thermal expansion plugging is analyzed, and if the target production effect is reached, the production can be continuously maintained; if the target production effect is not achieved, the steps 4-7 are repeated, and the sweep range of the plugging of the magnetic expansion microspheres is monitored in real time, so that the problem of accurate plugging adjustment of the inter-well cracks is solved, the residual oil between the injection and production wells can be effectively adjusted and used, and the sweep coefficient is improved.
The invention has the beneficial effects that:
1. the invention can realize the targeted blocking of the large-crack passage targets among wells, solves the problem that the migration of the blocking agent is difficult to control, saves the dosage of the blocking agent and improves the water blocking effect.
2. The invention can realize accurate depiction of the dominant fracture channel through magnetic anomaly inversion, and can solve the problem of fracture migration streamline among well groups.
3. The invention can achieve the function of controlling real-time adjustment and displacement by the magnetocaloric expansion of the target area through the magnetic migration and magnetocaloric expansion method, and has high efficiency, convenience and good extraction effect.
Drawings
FIG. 1 is a schematic diagram of a system cross-section structure of a fractured reservoir plugging system based on multiple magnetic field controllable magnetic expansion microspheres;
in the figure: 1. a water tank; 2. a material tank; 3. a switch; 4. a flow valve; 5. a metering valve; 6. mixing room; 7. a sampling box; 8. a booster pump; 9. strong magnetic generating device; 10. an electromagnetic flow valve; 11. a ground resistance-capacitance controller; 12. a data acquisition card; 13. a data processing module; 14. a data imaging display module; 15. an operation control unit; 16. a variable frequency control unit; 17. an alternating power output unit; 18. a magnetic field measuring device; 19. a signal amplifying unit; 20. a constant power output unit; 21. coating a stratum; 22. a destination layer; 23. a weak magnetic generating device; 24. a control circuit; 25. formation fracture;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a graph showing the plugging effect of the invention.
Detailed Description
The invention will now be further illustrated by way of example, but not by way of limitation, with reference to the accompanying drawings.
Example 1:
a fractured reservoir plugging control system based on multiple magnetic field controllable magnetic expansion microspheres, as shown in fig. 1, comprising: the system comprises a microsphere injection subsystem, a data acquisition subsystem, a data processing and imaging subsystem, a constant magnetic field control subsystem and an alternating magnetic heat control subsystem.
The microsphere injection subsystem comprises a water tank 1, a material tank 2 and a mixing room 6, wherein the water tank is connected to the mixing room through a water tank conveying pipeline, the material tank is connected to the mixing room through a microsphere conveying pipeline, injected water is clean water processed by a water supply station, magnetic expansion microspheres manufactured according to functional requirements are stored in the material tank, a switch 3 and a flow valve 4 are arranged on the water tank conveying pipeline, a switch and a metering valve 5 are arranged on the microsphere conveying pipeline, the mixing proportion of the water and the magnetic expansion microspheres is adjusted through a water injection flow valve and a microsphere metering valve respectively, the mixing room is connected to a water injection well shaft through an output pipeline, a booster pump 8 is arranged on the output pipeline, and the water and the magnetic expansion microspheres enter the mixing room according to a certain volume proportion to be mixed to form injection liquid, and then enter a pressurized injection construction.
The data acquisition subsystem includes a magnetic field measurement device 18 disposed in the wellbore near the target fracture; the magnetic field measuring device can be placed in a production well or a shaft near the production well, the production is not started during the measurement, the purpose is to move the magnetic expansion microspheres to a target position, and whether the microspheres reach the target position or not is determined through the measuring device; the magnetic field measuring device adopts a superconducting quantum interferometer.
The data processing and imaging subsystem comprises a data acquisition card 12, a data processing module 13 and a data imaging display module 14, wherein the data acquisition card is connected with the magnetic field measuring device and the data processing module through communication lines, the data processing module calculates the sweep range of the magnetic expansion microsphere by adopting an inversion algorithm, and the data imaging display module is used for displaying data results.
The constant magnetic field control subsystem is connected with the data processing and imaging subsystem through a communication line, the constant magnetic field control subsystem comprises an operation control unit 15, a signal amplifying unit 19 and a constant power output unit 20 which are mutually connected, the operation control unit is connected with the data processing and imaging subsystem so as to receive control signals, the constant power output unit is connected with the strong magnetic generating device 9 through a control line, a switch is arranged on the control line, and the magnetic field direction and intensity are adjusted according to the current magnetic expansion microsphere wave and range imaging information until the magnetic expansion microsphere enters the stratum crack 25 of the target layer 22 to be comprehensively distributed; the magnetic field generating device comprises a weak magnetic generating device and a strong magnetic generating device, wherein the weak magnetic generating device is arranged in a target stratum shaft of the injection well, namely a weak magnetic generating device 23 in a shaft on the left side in fig. 1; the strong magnetic generating device is arranged in the target formation wellbore of the production well, i.e. as the strong magnetic generating device 9 in the right wellbore in fig. 1.
The alternating magnetic heating control subsystem is connected with the data processing and imaging subsystem through a communication line, the alternating magnetic heating control subsystem comprises an operation control unit 15, a variable frequency control unit 16 and an alternating power output unit 17 which are mutually connected, the operation control unit is connected with the data processing and imaging subsystem so as to receive control signals, the alternating power output unit is connected with a strong magnetic generating device 9 through a control line, a switch is arranged on the control line, the magnetic field generating device is a coil, alternating current and direct current are respectively supplied, and the aims of constant magnetic field traction and alternating magnetic field heating can be achieved in different time periods. The constant and alternating are connected to the magnetic field generator, and the action of the magnetic field is selected by the on-off of the switch.
The ground is provided with a ground resistance-capacitance controller 11, the weak magnetism generating device 23 is connected with the ground resistance-capacitance controller 11 through a control line 24, and the ground resistance-capacitance controller 11 is used for controlling the intensity and frequency of a generated magnetic field. By varying the values of the capacitor and resistor and a constant, alternating selection to adjust the strength and frequency of the alternating magnetic field, the heating process can be precisely controlled, ensuring that precise temperature control is provided when needed.
The magnetic expansion microsphere comprises a two-layer core-shell structure, wherein the shell is thermoplastic acrylic polymer, and the core layer is alkane gas and magnetic Fe with ultra-small particle size 4 O 3 The ultra-small particle size is 2-5 nanometers. The temperature range under the control of magnetocaloric is 50-150 ℃, the expansion multiplying power of the microsphere volume can reach 5-10 times, and the synthesis of the microsphere can be completed according to the requirements of various expansion ranges.
A sampling box 7 and a switch are arranged between the mixing room and the booster pump, and a metering valve 5, a switch and an electromagnetic flow valve 10 are arranged on a pipeline between the booster pump and the water injection well shaft.
Example 2:
a plugging method of a fractured reservoir plugging system based on multiple magnetic field controllable magnetic expansion microspheres adopts the system and injection medium described in the embodiment 1, as shown in fig. 2, and comprises the following specific steps:
step 1: analysis of reservoir conditions, fracture parameters and synthesis of caulking microsphere materials
Firstly, representing parameters of the occurrence, distribution, width and opening of a target fracture of an oil reservoir based on data of an earthquake, a well logging, a core and a slice, and constructing a three-dimensional fracture model; then, quantifying the range and the volume of the plugged target crack by a target carving and volume method, and further combining the distribution and the size of the magnetic expansion microspheres, so that the dosage of the magnetic expansion microspheres can be calculated; in order to achieve a better plugging effect, when the single layer in the crack is filled with the magnetic expansion microspheres, the diameter of the expanded magnetic expansion microspheres can reach the maximum opening of the target crack;
step 2: arrangement construction site and foundation magnetic field measurement
Five systems are arranged around the ground of the target well group in a coordinated manner: the system comprises a microsphere injection subsystem, a data acquisition subsystem, a data processing and imaging subsystem, an alternating magnetocaloric control subsystem and a constant magnetic field control subsystem. Starting a magnetic field measuring device 18 in the right production well to measure an initial background magnetic field; then the weak magnetic generating device 23 in the water injection well on the left side is started, the magnetic field measuring device 18 is used for measuring the low flux externally applied magnetic field, and then the weak magnetic generating device 23 is closed.
Step 3: injection liquid mixing
The injection water is connected with the mixing room through a water tank conveying pipeline, the material tank is connected with the mixing room through a microsphere conveying pipeline, the injection water is clean water treated by a water supply station, the material tank stores magnetic expansion microspheres synthesized according to functional requirements, the mixing proportion of the water and the magnetic expansion microspheres is adjusted through a flow valve and a metering valve respectively, and the water and the magnetic expansion microspheres are mixed according to the following proportion of 3: and (3) mixing the mixture in a mixing room in a volume ratio to form injection.
Step 4: magnetic expansion microsphere mixed liquid injection construction
Taking Tarim oil field wheel old 7 well group as an example, a water shutoff profile control scheme is designed, and the injection position of the mixed liquid of the magnetic expansion microspheres is definitely the target interval of the crack, the injection pressure is 70Mpa, and the injection quantity is 2 multiplied by 10 4 m 3 And then pressurizing injection liquid by a booster pump, injecting construction, starting a magnetic field generating device in the water injection well, and measuring disturbance magnetic field data of the injected magnetic expansion microsphere injection liquid in real time by using a magnetic field measuring device.
Step 5: magnetic field data acquisition processing and microsphere migration monitoring
The magnetic field distribution in the space around the position can be changed after the magnetic expansion microsphere is injected, so that magnetic field abnormality is generated. Transmitting the initial background magnetic field measured in the step 2, the low-flux external magnetic field and the disturbance magnetic field data measured in the step 4 to a data acquisition subsystem, a data processing and imaging subsystem through a communication line to obtain magnetic field intensity data in the monitoring areas x, y and z, solving a Laplacian equation of the disturbance magnetic field by a finite element method, and constructing a model and solving by using an AC/DC module of commercial finite element COMSOL software to obtain the sweep range of the magnetic expansion microsphere; the distribution of the magnetic expansion microspheres is imaged on the surface of the well group in real time, and the distribution of the magnetic microspheres can be continuously monitored through inversion results in real time until the magnetic expansion microspheres enter the target cracks to be distributed comprehensively.
Step 6: applying a guiding magnetic field to guide the magnetically expandable microspheres into the fracture
And (3) on the basis of inverting the sweep range of the magnetic expansion microspheres in the step (5), automatically identifying the non-sweep region of the magnetic expansion microspheres in the target fracture by adopting the sweep range imaging information of the magnetic expansion microspheres, then opening the strong magnetic generating device 9 in the production well, setting the magnetic field strength, and adjusting the depth of the strong magnetic generating device 9 through a preset controller to guide the magnetic expansion microspheres to enter the non-sweep target fracture plugging region.
If the magnetic field generating devices (more than 2 wells) are arranged in the multi-well, the guiding direction of the magnetic force can be controlled through the cooperation of the multi-well (comprising three types of switching adjustment of the magnetic field generating devices, magnetic field intensity adjustment of each magnetic field generating device and depth adjustment of the magnetic field generating device). In the case, two wells of the injection well group are adopted, and the magnetic microspheres can be magnetically guided to enter a target crack region to be plugged only by adjusting the depth of the strong magnetic generating device 9; the constant magnetic field gradient in this case was 100kA/m 2 The magnetic field strength at the side of the injection well is 100kA/m.
The magnetic field force of the magnetic expansion microsphere in the magnetic field is as follows:
（1）
in the middle ofIs the volume of the magnetic expansion microsphere, +.>Is of vacuum permeability->Is the magnetization of the magnetic expansion microsphere, +.>Is a magnetic field gradient.
Step 7: applying an alternating magnetic field, and magnetically expanding the magnetic thermal expansion caulking of the magnetic expansion microsphere
An alternating magnetic heat control subsystem is started, an alternating magnetic field is applied to a stratum target plugging position, the heating process can be accurately controlled according to a magnetic expansion microsphere expansion curve, accurate temperature control is ensured to be provided when needed, a preset expansion volume is reached, and then plugging of a crack area is achieved; in the case, the alternating magnetic field intensity at the side of the injection well is 100kA/m, and the alternating frequency is 10kHz; the expansion curve is a relation curve of temperature obtained through microsphere thermal expansion experiments and microsphere expansion multiplying power.
Wherein, the alternating magnetic field is generated by alternating current electromagnet, and the heating power of the magnetic expansion microsphere in the alternating magnetic field is:
（2）
in the method, in the process of the invention,to balance magnetic susceptibility>For maximum field strength at the peak +.>For alternating magnetic field frequency>Is the effective relaxation time.
The expansion constitutive equation of the magnetic expansion microsphere temperature control is as follows:
（3）
in the method, in the process of the invention,is expansion strain->Temperature, < >>Is the reference temperature, +.>，/>，/>Is a temperature dependent coefficient equation.
Step 8: after plugging is completed, the production well is opened for production, the plugging effect is evaluated, the production dynamics before and after plugging is tracked, optimized and compared, the effect of the magnetic thermal expansion plugging is analyzed, and if the target production effect is reached, the production can be continuously maintained; if the target production effect is not achieved, the steps 4-7 are repeated, and the sweep range of the plugging of the magnetic expansion microspheres is monitored in real time, so that the problem of accurate plugging adjustment of the inter-well cracks is solved, the residual oil between the injection and production wells can be effectively adjusted and used, and the sweep coefficient is improved.
As shown in fig. 3, the production cannot be started during plugging, fig. 3 shows the production dynamics before plugging and the production dynamics after plugging, the number of days is calculated again from 0 when the production starts after the plugging operation is completed, the water content and the daily liquid yield are both obviously reduced, the liquid amount is reduced from 63.8 tons/day to 20.8 tons/day, the water content is reduced from 84.6 percent to 36.6 percent, and the water plugging effect has obvious effectiveness.
Claims (8)
1. The utility model provides a crack nature oil reservoir of magnetic microsphere transfers stifled system under multiple magnetic control which characterized in that includes: the system comprises a microsphere injection subsystem, a data acquisition subsystem, a data processing and imaging subsystem, a constant magnetic field control subsystem and an alternating magnetic heat control subsystem;
the microsphere injection subsystem comprises a water tank, a material tank and a mixing room, wherein the water tank is connected to the mixing room through a water tank conveying pipeline, the material tank is connected to the mixing room through a microsphere conveying pipeline, magnetic expansion microspheres are stored in the material tank, a switch and a flow valve are arranged on the water tank conveying pipeline, a switch and a metering valve are arranged on the microsphere conveying pipeline, the mixing room is connected to a water injection well shaft through an output pipeline, and a booster pump is arranged on the output pipeline;
the data acquisition subsystem comprises a magnetic field measuring device which is arranged in a shaft near a target fracture;
the data processing and imaging subsystem comprises a data acquisition card, a data processing module and a data imaging display module, wherein the data acquisition card is connected with the magnetic field measuring device and the data processing module through communication lines, the data processing module adopts inversion algorithm to calculate and obtain the sweep range of the magnetic expansion microsphere, and the data imaging display module is used for displaying data results;
the constant magnetic field control subsystem is connected with the data processing and imaging subsystem through a communication line, the constant magnetic field control subsystem comprises an operation control unit, a signal amplifying unit and a constant power output unit which are mutually connected, the operation control unit is connected with the data processing and imaging subsystem, the constant power output unit is connected with the magnetic field generating device through a control line, and a switch is arranged on the control line;
the alternating magnetic heating control subsystem is connected with the data processing and imaging subsystem through a communication line, the alternating magnetic heating control subsystem comprises an operation control unit, a variable frequency control unit and an alternating power output unit which are mutually connected, the operation control unit is connected with the data processing and imaging subsystem, the alternating power output unit is connected with the magnetic field generating device through a control line, and a switch is arranged on the control line.
2. The system for plugging a fractured reservoir of magnetic microspheres under multiple magnetic control according to claim 1, wherein a ground surface resistance-capacitance controller is arranged on the ground surface, the magnetic field generating device is connected with the ground surface resistance-capacitance controller, and the ground surface resistance-capacitance controller is used for controlling the intensity and frequency of the generated magnetic field.
3. The system for plugging a fractured reservoir by using magnetic microspheres under multiple magnetic control according to claim 1, wherein the magnetic expansion microspheres comprise a two-layer core-shell structure, wherein the shell is a thermoplastic acrylic polymer, and the core layer is alkane gas and magnetic Fe with ultra-small particle size 4 O 3 Spherical plastic particles composed of nano particles; the ultra-small particle size is 2-5 nanometers.
4. The system for plugging the fractured reservoir of the magnetic microsphere under the multiple magnetic control according to claim 1, wherein a sampling box and a switch are arranged between the mixing room and the booster pump, and a metering valve, a switch and an electromagnetic flow valve are arranged on a pipeline between the booster pump and a water injection well shaft.
5. The system for plugging a fractured reservoir of magnetic microspheres under multiple magnetic control according to claim 1 wherein the magnetic field measuring device is a superconducting quantum interferometer.
6. The fractured reservoir plugging system of magnetic microspheres under multiple magnetic control according to claim 1, wherein the magnetic field generating device comprises a weak magnetic generating device and a strong magnetic generating device, the weak magnetic generating device is arranged in a target stratum well bore of the injection well, and the strong magnetic generating device is arranged in a target stratum well bore of the production well.
7. A plugging method of a fractured reservoir plugging system of magnetic microspheres under multiple magnetic control, which adopts the system and injection medium according to any one of claims 1-6, and is characterized by comprising the following specific steps:
step 1: analysis of reservoir conditions, fracture parameters and synthesis of caulking microsphere materials
Firstly, representing parameters of the occurrence, distribution, width and opening of a target fracture of an oil reservoir based on data of an earthquake, a well logging, a core and a slice, and constructing a three-dimensional fracture model; then quantifying the range and the volume of the plugged target crack, and further calculating the dosage of the magnetic expansion microsphere by combining the distribution and the size of the magnetic expansion microsphere; when the single layer in the crack is filled with the magnetic expansion microsphere, the diameter of the magnetic expansion microsphere reaches the maximum opening of the target crack after expansion;
step 2: arrangement construction site and foundation magnetic field measurement
Five systems are arranged around the ground of the target well group in a coordinated manner: the system comprises a microsphere injection subsystem, a data acquisition subsystem, a data processing and imaging subsystem, a constant magnetic field control subsystem and an alternating magnetic heat control subsystem; starting a magnetic field measuring device in a well bore of a production well, and measuring an initial background magnetic field; then starting a magnetic field generating device in the water injection well, measuring a low flux external magnetic field by using a magnetic field measuring device, and then closing the magnetic field generating device;
step 3: injection liquid mixing
The material tank is connected with the mixing room through a microsphere conveying pipeline, the injected water is clean water treated by a water supply station, the magnetic expansion microspheres are stored in the material tank, the mixing proportion of the water and the magnetic expansion microspheres is adjusted through a flow valve and a metering valve respectively, and the water and the magnetic expansion microspheres enter the mixing room according to a certain volume proportion to be mixed to form injection liquid;
step 4: magnetic expansion microsphere mixed liquid injection construction
Pressurizing injection liquid by a booster pump, constructing, starting a magnetic field generating device in a water injection well, and measuring disturbance magnetic field data of the injected magnetic expansion microsphere injection liquid in real time by using a magnetic field measuring device;
step 5: magnetic field data acquisition processing and microsphere migration monitoring
Transmitting the initial background magnetic field measured in the step 2, the low-flux external magnetic field and the disturbance magnetic field data measured in the step 4 to a data acquisition subsystem, a data processing and imaging subsystem through a communication line to obtain magnetic field intensity data in the three directions of a monitoring area x, y and z, and solving the Laplacian equation of the disturbance magnetic field by a finite element method to obtain the sweep range of the magnetic expansion microspheres, wherein the distribution of the magnetic expansion microspheres is imaged on the ground of a well group in real time;
step 6: applying a constant magnetic field to guide the magnetically expandable microspheres into the fracture
On the basis of inverting the sweep range of the magnetic expansion microspheres in the step 5, identifying the non-sweep area of the magnetic expansion microspheres in the target fracture by adopting the sweep range imaging information of the magnetic expansion microspheres, then opening a magnetic field generating device in a production well, setting the magnetic field strength, and adjusting the depth of the magnetic field generating device through a preset controller to guide the magnetic expansion microspheres to enter the non-sweep target fracture plugging area;
the magnetic field force of the magnetic expansion microsphere in the magnetic field is as follows:
（1）
in the middle ofIs the volume of the magnetic expansion microsphere, +.>Is of vacuum permeability->Is the magnetization intensity of the magnetic expansion microsphere,is a magnetic field gradient;
step 7: applying an alternating magnetic field, and magnetically expanding the magnetic thermal expansion caulking of the magnetic expansion microsphere
Starting an alternating magnetic heat control subsystem, applying an alternating magnetic field to a stratum target plugging position, and controlling a heating process according to a magnetic expansion microsphere expansion curve to reach a preset expansion volume so as to plug a crack area; the expansion curve is a relation curve of temperature and microsphere expansion multiplying power;
wherein, the alternating magnetic field is generated by alternating current electromagnet, and the heating power of the magnetic expansion microsphere in the alternating magnetic field is:
（2）
in the method, in the process of the invention,to balance magnetic susceptibility>For maximum field strength at the peak +.>For alternating magnetic field frequency>Is the effective relaxation time;
the expansion constitutive equation of the magnetic expansion microsphere temperature control is as follows:
（3）
in the method, in the process of the invention,is expansion strain->Temperature, < >>Is a reference toTemperature (F)>，/>，/>Is a temperature dependent coefficient equation;
step 8: after plugging is completed, the production well is opened for production, the plugging effect is evaluated, the production dynamics before and after plugging is tracked, optimized and compared, and if the target production effect is reached, the production can be continuously maintained; if the target production effect is not achieved, repeating the steps 4-7, and monitoring the sweep range of the caulking of the magnetic expansion microsphere in real time.
8. The method for plugging control of a fractured reservoir by using magnetic microspheres under multiple magnetic control according to claim 7, wherein in step 3, the ratio of water to magnetic expansion microspheres is 3: and (3) mixing the mixture in a mixing room in a volume ratio to form injection.
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