Carbon dioxide injection profile detection device, detection method and recovery device

Abstract

The invention discloses a carbon dioxide injection profile detection device, a detection method and a recovery device.According to the carbon dioxide injection profile detection device, a sealing shell is provided with one or more pressure guiding holes, the outer surface of the sealing shell is coated with a soluble metal outer layer, and the soluble metal outer layer is used for adjusting the density of the detection device; the detection packaging assembly is packaged in the sealing shell, is connected with the pressure leading hole through a sensor diaphragm, and is used for monitoring related environmental parameters of an underground carbon dioxide injection profile; before the soluble metal outer layer is dissolved, the density of the detection device is greater than that of an underground environment solution; after the soluble metal outer layer is dissolved, the density of the detection device is smaller than that of the underground environment solution. The liquid carbon dioxide injection section can be detected and recycled more conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field testing, and in particular to a carbon dioxide injection profile detection device, a detection method and a recovery device. Background Art

[0002] Carbon dioxide flooding is one of the important supporting technologies for carbon capture and storage in CCUS (Carbon Capture, Utilization and Storage). By injecting CO2 into the formation, the crude oil can expand in volume after dissolving CO2, increasing the elastic energy of the formation; as the formation pressure increases, the solubility of CO2 in crude oil increases, and the viscosity of crude oil decreases more significantly. Since CO2 and water coexist in CO2 injection wells, CO2 has solubility in oil and water under reservoir conditions, and its conditional miscibility with crude oil and water mainly depends on the formation pressure. In addition, the heat exchange between the liquid CO2 in the wellbore and the surrounding formations and the ambient temperature increase with the depth of the well. The temperature in the wellbore will change significantly with the depth of the well, and the temperature can be used to determine the absorption of the downhole absorption layer. However, it has always been a difficult problem to monitor the injection profile after the injection of liquid CO2. In order to evaluate the effect of CO2 flooding and optimize the injection plan, it is necessary to accurately grasp the injection amount of CO2 in each layer. In the prior art, there are two methods for conducting an air intake profile test, namely, a turbine flow meter and pulse neutron oxygen activation. However, the testing processes of these two technologies are complicated and their field applications are limited. Summary of the invention

[0003] The embodiments of the present invention solve the technical problem of complex testing process in the prior art by providing a carbon dioxide injection profile detection device, a detection method and a recovery device, achieve the technical effect of more accurate and convenient detection of the injection profile after the injection of liquid CO2, and are easy to apply on site.

[0004] In the first aspect, to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0005] A carbon dioxide injection profile detection device comprises: a sealed shell, wherein one or more pressure-inducing holes are provided on the sealed shell, and a soluble metal outer layer is coated on the outer surface of the sealed shell, wherein the soluble metal outer layer is used to adjust the density of the detection device; a detection packaging component, which is packaged inside the sealed shell and connected to the pressure-inducing holes through a sensor diaphragm, and is used to monitor relevant environmental parameters of the downhole carbon dioxide injection profile; before the soluble metal outer layer is dissolved, the density of the detection device is greater than the density of the downhole environmental solution; after the soluble metal outer layer is dissolved, the density of the detection device is less than the density of the downhole environmental solution.

[0006] Optionally, the detection packaging component includes: the detection packaging component includes a power supply and a temperature detection sensor, an acceleration detection sensor, a controller, and a pressure detection sensor powered by the power supply; the controller is connected to the sensor diaphragm through the temperature detection sensor, the acceleration detection sensor, and the pressure detection sensor, respectively; the acceleration detection sensor is used to detect the position and shape of the detection device; the temperature detection sensor and the pressure detection sensor are respectively used to collect the temperature and pressure of the downhole carbon dioxide injection profile through the sensor diaphragm; the controller is used to start recording the position and shape, temperature, and pressure from the temperature detection sensor, the acceleration detection sensor, and the pressure detection sensor according to the start time and the sampling time.

[0007] Optionally, the soluble metal outer layer is made of soluble magnesium alloy; the thickness and weight of the soluble magnesium alloy are set according to the density of the downhole environmental solution, so that the initial density of the detection device is greater than the density of the downhole environmental solution, and it is dissolved according to a preset time.

[0008] Optionally, a fixing boss is provided inside the sealing shell for fixing the detection packaging assembly.

[0009] Optionally, a cavity is provided in the sealed housing;

[0010] When the soluble metal outer layer is dissolved, the density of the detection device is lower than the density of the downhole environmental solution due to the influence of the cavity volume.

[0011] In a second aspect, a recovery device for a carbon dioxide injection profile detection device is provided, comprising: a three-way pipeline, a first valve, a second valve, a third valve, a collecting pipe and a pressure relief valve arranged on the above-mentioned collecting pipe; the inlet of the above-mentioned three-way pipeline is connected to the first oil pipe gate at the wellbore inlet or the second oil pipe gate at the wellbore inlet through the above-mentioned first valve; the first outlet of the above-mentioned three-way pipeline is connected to the second valve, and a filter element for blocking the above-mentioned detection device is provided at the above-mentioned first outlet; the second outlet of the above-mentioned three-way pipeline is connected to the collecting pipe through the third valve; the above-mentioned detection device is driven by the pressure in the well and enters the above-mentioned three-way pipeline from the above-mentioned oil pipe gate; and under the constraint of the above-mentioned filter element, it enters the collecting pipe from the above-mentioned second outlet through the above-mentioned third valve.

[0012] Optionally, the device further comprises a liquid storage device, wherein the liquid storage device is connected to the outlet of the second valve and is used for storing liquid carbon dioxide flowing out of the second valve.

[0013] In a third aspect, a method for detecting a carbon dioxide injection profile is provided, comprising: installing an oil pipe in a wellbore; wherein an injection pipe is installed at the upper end of the oil pipe and is blocked by a test gate, wherein a detection device for the carbon dioxide injection profile is injected into the injection pipe, and each of the detection devices stores its own serial number information; an injection screen is installed at the bottom end of the oil pipe, wherein the aperture of the injection screen is smaller than the radius of the detection device; using a ground liquid carbon dioxide vehicle group to drive the liquid carbon dioxide vehicle into the oil pipe through a first oil pipe gate at the entrance of the wellbore, so that the liquid carbon dioxide vehicle drives the detection device and enters the injection screen from the oil pipe; controlling the opening of the test gate to allow a plurality of detection devices in the injection pipe to follow the liquid carbon dioxide flow through the bottom of the injection screen and to be deposited, wherein the plurality of detection devices are started to collect relevant environmental parameters of the carbon dioxide injection profile according to the start time and the sampling time; after the plurality of detection devices are suspended upward along the oil pipe to the gate, the plurality of detection devices are recovered; obtaining relevant environmental parameters from the plurality of devices, and calculating the carbon dioxide injection profile based on the relevant environmental parameters of the plurality of devices.

[0014] Optionally, after the above-mentioned several detection devices are suspended upward along the above-mentioned oil pipe to the above-mentioned test gate, the above-mentioned method also includes: recovering the above-mentioned detection devices through the recovery device of the above-mentioned carbon dioxide injection profile detection device; when recovering through the above-mentioned first oil pipe gate, first dismantling the ground liquid carbon dioxide vehicle group, and then installing the above-mentioned detection devices.

[0015] Optionally, a packer is provided between the oil pipe and a casing sleeved outside the oil pipe to seal the annular space between the oil pipe and the casing to prevent liquid carbon dioxide from overflowing from the wellhead.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] In the embodiment of the present invention, a soluble metal outer layer is used to change the density of the detection device, thereby forming a density difference with the downhole environmental solution, thereby controlling the detection device to automatically sink and float in the target wellbore, avoiding the need for a large amount of detection equipment and complex installation required by methods such as turbine flowmeters and pulse neutron oxygen activation, reducing the complexity of the test, and making on-site application more convenient.

[0018] After the detection device floats up, the recovery device is driven by the pressure in the wellbore itself and separates the detection device from the downhole environmental solution by controlling the corresponding valves, making it easier to recover the detection device and improving convenience.

[0019] The test method used is to use several detection devices to follow the liquid carbon dioxide flowing through the bottom of the injection screen and deposit, without the need for manual detection equipment below. At the same time, several detection devices start to collect relevant environmental parameters of the carbon dioxide injection profile according to the start time and sampling time; using the timing method, the entire test is automatically run, further improving the convenience of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A structural schematic diagram of a carbon dioxide injection profile detection device provided by the present invention;

[0022] Figure 2 A flow chart of a carbon dioxide injection profile detection method provided by the present invention;

[0023] Figure 3 A schematic diagram of the principle of a carbon dioxide injection profile detection method provided by the present invention;

[0024] Figure 4 A schematic structural diagram of a recovery device of a carbon dioxide injection profile detection device provided by the present invention.

[0025] Figure numerals: 1. Sealing shell; 11. Soluble metal outer layer; 13. Pressure inlet; 2. Detection packaging assembly; 21. Pressure detection sensor; 22. Controller; 23. Acceleration detection sensor; 24. Temperature detection sensor; 25. Power supply; 26. Sensor diaphragm; 3. Cavity; 4. Fixed boss; 5. Carbon dioxide vehicle group; 51. Flow meter; 6. Oil pipe equipment; 61. First oil pipe gate; 611. Second oil pipe gate; 62. Blowout preventer; 63. Injection pipe; 64. Test gate; 65. Oil pipe; 66. Casing; 67. Packer; 68. Injection screen; 7. Oil layer; 8. Recovery device; 81. Three-way pipeline; 82. First valve; 83. Second valve; 84. Third valve; 85. Collection pipe; 86. Pressure relief valve; 87. Filter. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations of the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0031] The technical solution of the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0032] Due to the complex environment in the wellbore and the presence of oil, gas and liquid carbon dioxide, ordinary sensors cannot reach the designated position and effectively recover in this environment. Therefore, the present invention adjusts the density of the detection device so that the detection device can smoothly enter the oil pipe 65 and automatically float up. Specifically, a soluble metal outer layer 11 is provided in the detection device. Before the soluble metal outer layer 11 dissolves, the density of the detection device is greater than the density of the downhole environmental solution, which allows the detection device to move smoothly to the bottom of the oil pipe 65; after the soluble metal outer layer 11 dissolves, the density of the detection device is less than the density of the downhole environmental solution, thereby completing the floating recovery of the detection device.

[0033] Embodiment 1:

[0034] In an embodiment of the present invention, there is provided Figure 1 A carbon dioxide injection profile detection device shown in the figure includes: a sealed shell 1, one or more pressure-inducing holes are opened on the sealed shell 1, and the outer surface of the sealed shell 1 is coated with a soluble metal outer layer 11, and the soluble metal outer layer 11 is used to adjust the density of the detection device; a detection packaging component 2, which is packaged inside the sealed shell 1 and connected to the pressure-inducing hole 13 through a sensor diaphragm 26, and is used to monitor relevant environmental parameters of the downhole carbon dioxide injection profile; before the soluble metal outer layer 11 is dissolved, the density of the detection device is greater than the density of the downhole environmental solution; after the soluble metal outer layer 11 is dissolved, the density of the detection device is less than the density of the downhole environmental solution.

[0035] It should be noted that the sealed shell 1, as the outermost component, is used to protect the internal structure. It is mainly used to protect the detection package component 2 from external damage. The soluble metal outer layer 11 is used to control the overall density of the detection device, and a soluble magnesium alloy or the like can be used. This embodiment is described by taking the application of the carbon dioxide injection profile detection device in an oil well as an example; specifically, before the measurement begins, the density of the soluble metal material is designed according to the density of the liquid in the oil pipe equipment 6; that is, before the soluble metal outer layer 11 dissolves, the density of the detection device is greater than the density of the downhole environmental solution, so that the detection device moves to the bottom of the wellbore with the liquid carbon dioxide. During the movement, the soluble metal outer layer 11 begins to melt. It should be noted here that the time used for melting is the preset time. In addition to continuous collection, the detection device will also melt before reaching the detection position; therefore, the preset time is set to be greater than the sum of the time for the detection device to reach the detection position and the sampling time. After the soluble metal outer layer 11 dissolves, the buoyancy of the detection device is greater than its own gravity. At this time, it begins to float upward and return to the wellbore entrance, thereby achieving the purpose of recovering the detection device. When the sensor diaphragm 26 is subjected to fluid pressure, the pressure inlet 13 can guide the fluid into the sealed housing 1, thereby causing deformation and pressure change of the sensor diaphragm 26. This pressure change can be transmitted to the measuring instrument or control system through the pressure inlet channel to achieve the measurement of the fluid pressure.

[0036] It should also be noted that the sensor used for detection adopts a detection package component 2. First, the detection package component 2 uses flexible pressure sensing technology to print flexible nano-functional materials with strong adhesion, bending resistance and high sensitivity on flexible and thin materials, so that it can achieve high sensitivity detection of pressure. It can detect small changes in pressure, temperature, displacement, etc., and has a fast response speed, which can achieve fast and accurate measurement of physical quantities. Secondly, since the environment in the oil well is relatively harsh, the detection package component 2 can work stably for a long time in various harsh environments, reducing the probability of failure. And the detection package component 2 will not generate dangerous factors such as electric sparks and high temperatures during the measurement process, ensuring safety in the oil well. Finally, it can also adapt to the measurement needs of various physical quantities, and can be measured in various complex environments, such as high temperature, low temperature, strong magnetism, vacuum and other environments, so as to measure multiple parameters based on this detection device.

[0037] Furthermore, if Figure 1As shown, the detection package component 2 includes a power supply 25 and a temperature detection sensor 24, an acceleration detection sensor 23, a controller 22, and a pressure detection sensor 21 powered by the power supply 25; the controller 22 is connected to the sensor diaphragm 26 through the temperature detection sensor 24, the acceleration detection sensor 23, and the pressure detection sensor 21 respectively; the acceleration detection sensor 23 is used to detect the position and shape of the detection device; the temperature detection sensor 24 and the pressure detection sensor 21 are respectively used to collect the temperature and pressure of the downhole carbon dioxide injection profile through the sensor diaphragm 26; the controller 22 is used to start recording the position and shape, temperature, and pressure from the temperature detection sensor 24, the acceleration detection sensor 23, and the pressure detection sensor 21 according to the start time and the sampling time.

[0038] It should be noted that the acceleration detection sensor 23 adopts a MEMS acceleration sensor, which has the technical characteristics of high precision, high resolution, low noise, low power consumption, low temperature drift, and overload resistance. It has a good response to low-frequency motion in the downhole environment and can provide the downhole position and motion parameters of the sensor. The temperature detection sensor 24 and the pressure detection sensor 21 are used to accurately provide the temperature and pressure parameters of the downhole measurement position. The controller 22 is used to control the startup and data acquisition of each sensor, and a single-chip microcomputer and the like can be used. Specifically, the startup time of each sensor is programmed and set through the controller 22, so as to complete the detection at the oil layer 7 position. After startup, the data detected by each sensor is obtained through the controller 22 and stored based on the memory in the controller 22.

[0039] It should also be noted that, based on the present embodiment, a wireless transmission module, such as a WiFi module and / or a Bluetooth module, etc., can also be provided, so that data can be directly transmitted wirelessly to a computer terminal for data analysis, thereby improving convenience.

[0040] Furthermore, the soluble metal outer layer 11 is made of soluble magnesium alloy; the thickness and weight of the soluble magnesium alloy are set according to the density of the downhole environmental solution, so that the initial density of the detection device is greater than the density of the downhole environmental solution, and it is dissolved according to the preset time.

[0041] Furthermore, if Figure 1 As shown, a fixing boss 4 is provided inside the sealing housing 1 for fixing the detection packaging component 2 .

[0042] It should be noted that, in addition to being used to fix the detection package component 2, the fixed boss 4 can also realize the positioning of the detection package component 2. For example, the detection package component 2 is set in the center position, and its sensor diaphragm 26 can extend equidistantly to the surrounding areas to obtain external data through the pressure-inducing holes. This not only avoids the shaking of the detection package component 2, but also allows for better detection. In addition, the fixed boss 4 is made of resin material to protect the detection package component 2. Specifically, the present embodiment uses two stacked fixed bosses 4 to fix the detection package component 2 in the middle of the detection device.

[0043] The sealed housing 1 is made of resin material with low density and high temperature resistance, such as epoxy resin, which can effectively protect the detection package component 2. The low density helps the detection device float and achieve recovery.

[0044] Furthermore, if Figure 1 As shown, a cavity 3 is provided in the sealed shell 1; when the soluble metal outer layer 11 is dissolved, the density of the detection device is less than the density of the downhole environmental solution due to the influence of the volume of the cavity 3.

[0045] It should be noted that the cavity 3 is provided to adjust the density of the detection device to achieve the purpose of lifting by buoyancy, wherein the adjustment by the cavity 3 is a rough adjustment, while the soluble metal 11 realizes fine adjustment, so that it can sink or float in the environmental solution. For example, when the density needs to be increased, heavier substances such as metals can be filled; and when the density needs to be reduced, the volume of the cavity can be expanded or directly filled with air. In this way, it can also adapt to different liquid environments, improving the applicability of the detection device.

[0046] The sealing housing 1 is spherical because when the detection device moves in the wellbore, if it adopts other shapes, its movement is hindered and it is easy to get stuck. The spherical shape makes it more convenient for the detection device to move.

[0047] Embodiment 2:

[0048] Based on the same inventive concept, an embodiment of the present invention provides a recovery device 8 of a carbon dioxide injection profile detection device, comprising: a three-way pipe 81, a first valve 82, a second valve 83, a third valve 84, a collecting pipe 85 and a pressure relief valve 86 arranged on the collecting pipe 85; the inlet of the three-way pipe 81 is connected to the first oil pipe gate 61 at the wellbore inlet or the second oil pipe gate 611 at the wellbore inlet through the first valve 82; the first outlet of the three-way pipe 81 is connected to the second valve 83, and a filter 87 for blocking the detection device is provided at the first outlet; the second outlet of the three-way pipe 81 is connected to the collecting pipe 85 through the third valve 84; the detection device is driven by the well pressure and enters the three-way pipe 81 from the oil pipe gate; under the constraint of the filter 87, it enters the collecting pipe 85 from the second outlet through the third valve 84.

[0049] It should be noted that, since there is a lot of pressure in the oil well, it is time-consuming and laborious to directly remove the detection device from the oil pipe 65, so a recovery device 8 is set for recovery. Specifically, the three-way pipe 81 is connected to the first oil pipe gate 61 or the second oil pipe gate 611 at the wellbore entrance. Because the liquid in the oil pipe 65 will spray the cap, the first valve 82 is used to control the outflow of the liquid in the oil pipe 65; open the first valve 82, and under the drive of the pressure in the oil pipe 65, the detection device enters the three-way pipe 81 along with the liquid in the oil pipe 65, and a filter 87 (such as a filter net) is set in the three-way pipe 81 to separate the detection device and the liquid; that is, the detection device is driven by pressure and under the constraint of the filter 87, it enters the collection pipe 85 through the second outlet of the three-way pipe 81, and the liquid enters the second valve 83 from the filter 87 and flows out. When it is confirmed that the number of detection devices in the collection pipe 85 reaches the requirement, close the third valve 84, remove the collection pipe 85, and recover the detection device.

[0050] Furthermore, the recovery device 8 further comprises a liquid storage device, which is communicated with the outlet of the second valve 83 and is used for storing the liquid carbon dioxide flowing out of the second valve 83 .

[0051] It should be noted that if the liquid in the oil pipe 65 flows out directly through the second valve 83, it will cause waste and also cause certain pollution. Therefore, a liquid storage device, such as a liquid storage tank and a liquid storage tank, is provided for recycling.

[0052] Embodiment 3:

[0053] Based on the same inventive concept, an embodiment of the present invention provides a method for detecting a carbon dioxide injection profile, such as Figure 2 As shown, the carbon dioxide injection profile detection device in Example 1

[0054] The method includes:

[0055] Step S101: Install an oil pipe 65 in the wellbore; wherein an injection pipe 63 is installed at the upper end of the oil pipe 65 and is blocked by a test gate 64, and a plurality of detection devices for carbon dioxide injection profiles are injected into the injection pipe 63, and each detection device stores its own serial number information; an injection screen 68 is installed at the bottom end of the oil pipe 65, and the aperture of the injection screen 68 is smaller than the radius of the detection device;

[0056] It should be noted that although the present embodiment is described with the application of the detection device in an oil well, the detection device can also be used in other places. The difference in the application environment is only the difference in the environmental solution. According to the environmental solution in which the detection device is located, the overall density of the detection device is set to be controlled, that is, when the detection device is placed, the overall density of the detection device is set to be greater than the density of the liquid in the oil pipe equipment 6, that is, the downhole environmental solution, to ensure that the detection device moves below the downhole environmental solution under the action of gravity; specifically, the outer layer of the detection device is increased with soluble metal, and the mass of the soluble metal is used to change the overall density of the detection device, so that it overcomes the buoyancy generated by the downhole environmental solution on the detection device and moves downward. During the movement, the soluble metal outer layer 11 reacts chemically with the downhole environmental solution, gradually falls off over time, and the soluble metal is gradually dissolved, so as to reduce the weight and density of the detection device, so that the buoyancy of the detection device overcomes the gravity of the detection device, and the density of the detection device gradually becomes lighter and suspends upward, so as to facilitate recovery. In detail, the setting method of the overall density of the detection device includes: setting a cavity 3 in the detection device, increasing the thickness of the soluble metal, etc. Before the detection device is placed in the oil pipe 65, each detection device body is numbered and assigned a corresponding number, and this information is written into the memory of each detection device controller 22 for distinction. In addition, since this embodiment is to collect relevant data of the carbon dioxide injection profile, that is, to measure the data of the position of the oil layer 7. Thus, by controlling the time, the data of the target position can be detected; that is, the time when the detection device reaches the oil layer 7 is measured by using the experimental data, and the time period after the movement time is set as the acquisition time, so as to obtain the carbon dioxide injection profile data of the oil layer 7.

[0057] Step S102: Using the surface liquid carbon dioxide vehicle group 5 to drive the liquid carbon dioxide vehicle into the oil pipe 65 through the first oil pipe gate 61 at the wellbore entrance, so that the liquid carbon dioxide vehicle drives the detection device and enters the injection screen 68 from the oil pipe 65;

[0058] When the liquid carbon dioxide injection process is carried out on site using the oil pipe equipment 6, the surface liquid carbon dioxide vehicle group 5 pressurizes the liquid carbon dioxide into the oil pipe 65 through the first oil pipe gate 61 at the wellhead, and a flow meter 51 is installed on the pipeline to obtain the total amount of liquid carbon dioxide injected on the ground. There is a packer 67 between the oil pipe 65 and the casing 66, which seals the annular space between the oil pipe 65 and the casing 66, so that the liquid carbon dioxide cannot return to the wellhead and protects the casing 66 from corrosion. The bottom of the oil pipe 65 is equipped with an injection screen 68, and the aperture of the screen is smaller than the diameter of the micro-detection device to prevent the detection device from flowing into the oil layer 7.

[0059] Step S103: Control the test gate 64 to open, so that the plurality of detection devices in the injection pipe 63 follow the liquid carbon dioxide flow through the bottom of the injection screen 68 and are deposited, and the plurality of detection devices are started to collect relevant environmental parameters of the carbon dioxide injection profile according to the start time and the sampling time; the sampling time is one of the factors that determine the dissolution time of the soluble metal outer layer 11 of the corresponding detection device;

[0060] It should be noted that multiple detection devices are injected into the oil pipe 65, including installing an injection pipe 63 above the wellhead, and a blowout preventer 62 is provided on the top of the injection pipe 63 to prevent overflow blowout. The blowout preventer 62 is opened to put the detection device into the injection pipe 63, and then the blowout preventer 62 is closed. The wellhead test gate 64 is opened, and the detection device moves downhole because its density is slightly greater than that of liquid carbon dioxide. The test gate 64 is closed, and the detection device starts testing during its downward movement. The injection pipe 63 can be removed and can be installed again when the detection device is recovered after the test. The detection device performs detection at a preset position based on the sampling time; the sampling time can be the time period of directly measuring the position of the oil layer 7, or a screen can be set at the position of the oil layer 7 on the oil pipe 65, so as to limit the detection device from continuing to move downward, so that it can measure at the best measurement position of the oil layer 7, and record the temperature, pressure, acceleration and other data of the corresponding layer section downhole, so as to improve the accuracy of the detection.

[0061] Step S104: after the plurality of detection devices are suspended upward along the oil pipe 65 to the gate, the plurality of detection devices are recovered;

[0062] Step S105: Obtaining the relevant environmental parameters of each of the plurality of devices, and calculating the carbon dioxide injection profile based on the relevant environmental parameters of each of the plurality of devices. Specifically, after a certain period of time, the soluble metal outer layer 11 of the detection device gradually corrodes and falls off, the density of the detection device becomes lighter and lighter, and the detection device gradually floats upward along the wellbore, and finally floats below the wellhead test gate 64.

[0063] Furthermore, after the plurality of detection devices are suspended upward along the oil pipe 65 to the test gate 64, the method further includes: recovering the detection devices through the recovery device 8; when recovering through the first oil pipe gate 61, first dismantling the ground liquid carbon dioxide vehicle group 5, and then installing the detection device, so as to prevent the backflow liquid from entering the carbon dioxide vehicle group 5.

[0064] Furthermore, a packer 67 is provided between the oil pipe 65 and a casing 66 sleeved outside the oil pipe 65 to seal the annular space between the oil pipe 65 and the casing 66 to prevent liquid carbon dioxide from overflowing from the wellhead.

[0065] Furthermore, the upper pressure inlet 13 and the lower pressure inlet 13 draw pressure from the external fluid and measure the temperature. The controller 22 obtains the pressure and temperature signals from the upper and lower pressure inlet 13 at the same time and performs average calculation, which can eliminate the error caused by rotation when the detection device moves downward in the oil pipe 65.

[0066] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0067] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for detecting a carbon dioxide injection profile, characterized in that: The detection device comprises: A sealed shell, wherein one or more pressure-inducing holes are provided on the sealed shell, and an outer surface of the sealed shell is coated with a soluble metal outer layer, wherein the soluble metal outer layer is used to adjust the density of the detection device; A detection packaging component is packaged inside the sealed housing and connected to the pressure-inducing hole through a sensor diaphragm, and is used to monitor relevant environmental parameters of the downhole carbon dioxide injection profile; Before the soluble metal outer layer is dissolved, the density of the detection device is greater than the density of the downhole environmental solution; After the soluble metal outer layer is dissolved, the density of the detection device is less than the density of the downhole environmental solution.

2. The detection device according to claim 1, characterized in that The detection package assembly comprises: The detection package assembly includes a power supply and a temperature detection sensor, an acceleration detection sensor, a controller, and a pressure detection sensor powered by the power supply; the controller is connected to the sensor diaphragm through the temperature detection sensor, the acceleration detection sensor, and the pressure detection sensor respectively; The acceleration detection sensor is used to detect the position and shape of the device; The temperature detection sensor and the pressure detection sensor are used to collect the temperature and pressure of the downhole carbon dioxide injection profile through the sensor diaphragm respectively; The controller is used to start recording the position, shape, temperature and pressure from the temperature detection sensor, acceleration detection sensor and pressure detection sensor according to the start time and sampling time.

3. The detection device according to claim 1, characterized in that: The soluble metal outer layer is made of soluble magnesium alloy; The thickness and weight of the soluble magnesium alloy are set according to the density of the downhole environmental solution, so that the initial density of the detection device is greater than the density of the downhole environmental solution, and the device is dissolved according to a preset time.

4. The detection device according to claim 1, characterized in that: A fixing boss is provided inside the sealing shell for fixing the detection packaging component.

5. The detection device according to claim 1, characterized in that: A cavity is provided in the sealed housing; When the soluble metal outer layer is dissolved, the density of the detection device is less than the density of the downhole environmental solution due to the influence of the cavity volume.

6. A recovery device for a carbon dioxide injection profile detection device, characterized in that: The recovery device comprises: A three-way pipeline, a first valve, a second valve, a third valve, a collecting pipe, and a pressure relief valve arranged on the collecting pipe; The three-way pipeline inlet is connected to the first oil pipe gate at the wellbore entrance or the second oil pipe gate at the wellbore entrance through the first valve; The first outlet of the three-way pipe is connected to the second valve, and a filter element for blocking the detection device according to any one of claims 1 to 5 is provided at the first outlet; The second outlet of the three-way pipeline is connected to the collecting pipe through the third valve; The detection device is driven by the well pressure and enters the three-way pipeline from the oil pipe gate; under the constraint of the filter element, it enters the collection pipe from the second outlet through the third valve.

7. The recovery device according to claim 6, characterized in that: The device further comprises a liquid storage device, which is communicated with the outlet of the second valve and is used for storing liquid carbon dioxide flowing out of the second valve.

8. A method for detecting a carbon dioxide injection profile, characterized in that: The method comprises: An oil pipe is installed in the wellbore; wherein an injection pipe is installed at the upper end of the oil pipe and is blocked by a test gate, and a plurality of detection devices for the carbon dioxide injection profile according to any one of claims 1 to 5 are injected into the injection pipe, and each of the detection devices stores its own serial number information; an injection screen is installed at the bottom end of the oil pipe, and the aperture of the injection screen is smaller than the radius of the detection device; Using a surface liquid carbon dioxide vehicle group to drive the liquid carbon dioxide vehicle into the oil pipe through the first oil pipe gate at the wellbore entrance, so that the liquid carbon dioxide vehicle drives the detection device to enter the injection screen from the oil pipe; Controlling the test gate to open, so that a plurality of detection devices in the injection pipe follow the liquid carbon dioxide flowing through the bottom of the injection screen and depositing, and the plurality of detection devices start to collect relevant environmental parameters of the carbon dioxide injection profile according to the start time and the sampling time; After the plurality of detection devices are suspended upward along the oil pipe to the gate, the plurality of detection devices are recovered; Relevant environmental parameters of each of the plurality of devices are obtained, and the carbon dioxide injection profile is calculated based on the relevant environmental parameters of each of the plurality of devices.

9. The method according to claim 8, characterized in that After the plurality of detection devices are suspended upward along the oil pipe to the test gate, the method further includes: The detection device is recovered by the recovery device of the carbon dioxide injection profile detection device as claimed in any one of claims 6 to 7; when recovered through the first oil pipe gate, the ground liquid carbon dioxide vehicle group is first dismantled, and then the detection device is installed for recovery.

10. The method according to claim 8, characterized in that A packer is provided between the oil pipe and a casing sleeved outside the oil pipe to seal the annular space between the oil pipe and the casing to prevent liquid carbon dioxide from overflowing from the wellhead.

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