Method, system and equipment for correcting visual carbon injection indication curve and medium

Abstract

The invention provides a method, system, equipment and medium for correcting a visual carbon injection indication curve, and the method comprises the following steps: recording the injection pressure of a well mouth and a well bottom at different carbon injection amounts and different temperatures, obtaining the correction coefficients of the injection pressure of the well mouth and the well bottom at different carbon injection amounts and different temperatures, and forming a correction coefficient array; in the injection process, on the basis of the correction coefficient set, the actual temperature and the carbon injection amount, the wellhead injection pressure is corrected to the well bottom on the basis of the correction coefficient set, and the well bottom actual pressure at multiple time points in the well is obtained; obtaining a carbon injection indication curve of the shaft bottom based on the multiple actual pressure of the shaft bottom and the corresponding actual carbon injection amount; according to the method, the wellhead carbon injection pressure, temperature and carbon injection amount are monitored, the wellhead temperature influence is automatically eliminated through the correction coefficient, the relation between the downhole carbon injection pressure and the injection amount can be directly converted, then drawing fitting is conducted, and the carbon absorption index can be obtained and can be used for guiding oil and gas field development and carbon dioxide displacement and storage.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas production in oilfields, and particularly relates to a method, system, device and medium for correcting a visual carbon injection indication curve. Background Art

[0002] The visual carbon injection well indication curve is a curve used to reflect the relationship between the injection flow rate and injection pressure of a carbon injection well. The carbon absorption index of the corresponding formation can be obtained according to the slope of the visual carbon injection well indication curve, which is used to guide the development of oil and gas fields and carbon dioxide capture, utilization and storage.

[0003] The visual carbon injection indication curve is generally obtained by recording different carbon injection amounts and corresponding stable injection pressures at the wellhead, and then plotting the points of different carbon injection amounts recorded and fitting the visual carbon absorption index. Currently, basically liquid carbon dioxide is injected at the wellhead. Affected by the day-night temperature difference (especially in Xinjiang region of China where the day-night temperature difference is large), it is very difficult to meet the stable requirement of the wellhead injection pressure, showing a periodic fluctuating change and unable to be accurately and timely recorded; if a downhole pressure gauge is continuously lowered to record the pressure, it will cost a large amount of monitoring expenses; the conventional method of using the wellhead + wellbore fluid pressure to calculate the bottom hole pressure is affected by the large change of the wellhead pressure and cannot be accurately recorded, and the wellhead pressure is affected by temperature and cannot be kept stable, so it is very difficult to judge whether the bottom hole injection pressure reaches stability. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a method, system, device and medium for correcting a visual carbon injection indication curve, which can eliminate the influence of wellhead temperature, accurately and quickly judge the stable value of the injection pressure, and obtain the carbon injection index curve and carbon absorption index.

[0005] The present invention is realized by the following technical solutions:

[0006] A method for correcting a visual carbon injection indication curve includes the following steps:

[0007] Record the injection pressures at the wellhead and bottom hole at different carbon injection amounts and different temperatures, and obtain the correction coefficients of the injection pressures at the wellhead and bottom hole at different carbon injection amounts and different temperatures, forming a correction coefficient array;

[0008] During the injection process, based on the correction coefficient array, actual temperature and carbon injection amount, correct the wellhead injection pressure to the bottom hole to obtain the actual bottom hole pressure at multiple time points in the well;

[0009] Based on multiple actual bottom hole pressures and corresponding actual carbon injection amounts, plot the corrected carbon injection indication curve of the bottom hole.

[0010] Further, the different temperatures are temperature points between the maximum ambient temperature and the minimum ambient temperature of the well in this area.

[0011] Further, the different temperatures are taken in an arithmetic progression at adjacent temperature points, and the relationship between adjacent temperature points is increasing or decreasing.

[0012] Further, the different carbon injection amounts are the carbon injection amount values between the maximum carbon injection amount and the minimum carbon injection amount under all working conditions during the actual injection process of this well.

[0013] Further, the different carbon injection amounts are taken in an arithmetic progression at adjacent carbon injection amount values, and the relationship between adjacent carbon injection amount values is increasing or decreasing.

[0014] Further, the correction coefficients of the wellhead and bottom-hole injection pressures at different carbon injection amounts and different temperatures are: the ratio between the wellhead and bottom-hole injection pressures.

[0015] Further, multiple time points in the well are for different carbon injection amounts during the production process of this well.

[0016] A system for correcting the apparent carbon injection indication curve includes:

[0017] An acquisition and processing module, configured to record the injection pressures of the wellhead and bottom-hole at different carbon injection amounts and different temperatures, and obtain the correction coefficients of the wellhead and bottom-hole injection pressures at different carbon injection amounts and different temperatures, forming a correction coefficient array;

[0018] A correction module, configured to correct the wellhead injection pressure to the bottom-hole based on the correction coefficient array, the actual temperature, and the carbon injection amount during the injection process, and obtain the actual bottom-hole pressures at multiple time points in the well;

[0019] An output module, configured to draw the corrected carbon injection indication curve of the bottom-hole based on multiple actual bottom-hole pressures and the corresponding actual carbon injection amounts.

[0020] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of a method for correcting the apparent carbon injection indication curve are implemented.

[0021] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of a method for correcting the apparent carbon injection indication curve are implemented.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The present invention provides a method, system, device and medium for correcting the visual carbon injection indication curve, including the following steps: recording the injection pressures at the wellhead and the bottom hole at different carbon injection amounts and different temperatures, and obtaining the correction coefficients of the injection pressures at the wellhead and the bottom hole at different carbon injection amounts and different temperatures to form a correction coefficient array; during the injection process, based on the correction coefficient array, the actual temperature and the carbon injection amount, correcting the wellhead injection pressure to the bottom hole to obtain the actual bottom hole pressures at multiple time points in the well; based on the multiple actual bottom hole pressures and the corresponding actual carbon injection amounts, plotting to obtain the corrected carbon injection indication curve of the bottom hole; by monitoring the wellhead carbon injection pressure, temperature and carbon injection amount, the present application automatically eliminates the influence of the wellhead temperature through the correction coefficient, can directly convert it into the relationship between the bottom hole carbon injection pressure and the injection amount, and then make a graph for fitting, so as to obtain the carbon absorption index, which can be used to guide the development of oil and gas fields and carbon dioxide displacement and storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flowchart of a method for correcting the visual carbon injection indication curve in an embodiment of the present invention;

[0025] Figure 2 It is a graph of the carbon injection wellhead and bottom hole pressures in an embodiment of the present invention;

[0026] Figure 3 It is a graph of the carbon injection index in an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of a system for correcting the visual carbon injection indication curve in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present invention in detail with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] Figure 1 A method for correcting the carbon injection indication curve in an embodiment of the present invention is shown as Figure 1 shown, and includes the following steps:

[0032] Record the injection pressures at the wellhead and bottomhole at different carbon injection amounts and different temperatures, and obtain the correction coefficients of the injection pressures at the wellhead and bottomhole at different carbon injection amounts and different temperatures, forming a correction coefficient array;

[0033] During the injection process, based on the correction coefficient array, actual temperature and carbon injection amount, correct the wellhead injection pressure to the bottomhole to obtain the actual bottomhole pressure at multiple time points in the well;

[0034] Based on multiple actual bottomhole pressures and the corresponding actual carbon injection amounts, plot the corrected carbon injection indication curve for the bottomhole.

[0035] It should be noted that the carbon injection amount mentioned in this application refers to the amount of carbon dioxide injected into the reservoir. In the petroleum industry, carbon injection is a method to improve oil recovery. By injecting carbon dioxide into the reservoir, the viscosity of the crude oil can be reduced, the fluidity of the crude oil can be increased, and thus the oil recovery can be improved;

[0036] The magnitude of the carbon injection amount is affected by factors such as the properties of the reservoir, production conditions, and the performance of the injection equipment. Among them, a representative influence in the production conditions is the temperature of the environment during the production process. That is, with the change of temperature, when other production conditions are the same, the wellhead and bottomhole pressures of carbon at this time are different;

[0037] Furthermore, there is a correlation between the wellhead and bottomhole pressures of carbon injection, Figure 2 is the wellhead and bottomhole pressure curve diagram of carbon injection in an embodiment of the present invention, as Figure 2 shown, when the pressures at the wellhead and bottomhole tend to be stable, with the change of the external temperature, the pressures at the wellhead and bottomhole will also show corresponding changes;

[0038] In this embodiment, the injection pressures at the wellhead and the bottom hole will be recorded at different carbon injection amounts and different temperatures, and the correction coefficients of the injection pressures at the wellhead and the bottom hole at different carbon injection amounts and different temperatures will be obtained, as shown in Table 1:

[0039]

[0040] In this embodiment, the different injection amounts include 20, 40, 60, and 80 tons of carbon dioxide, and the different temperatures include 10, 15, 20, and 25 °C. The pressure detection equipment is used to detect the wellhead and bottom hole pressure data under the corresponding temperature and injection amount conditions respectively, and a correction coefficient group of the injection pressures at the wellhead and the bottom hole is obtained through the processing of the wellhead and bottom hole pressure data.

[0041] Preferably, in this embodiment, the different temperatures are the temperature points between the maximum ambient temperature and the minimum ambient temperature of the well in this area; specifically, the different temperatures are taken in an arithmetic progression with adjacent temperature points, and the relationship between adjacent temperature points is increasing or decreasing; it should be noted that those skilled in the art can select the temperature according to the actual production environment. Generally speaking, the value between adjacent temperature points should be determined according to whether the target well is greatly affected by temperature changes. If the influence is large, multiple temperature points with a smaller difference should be selected. Otherwise, those skilled in the art can appropriately select temperature points with a larger interval.

[0042] Preferably, in this embodiment, the different carbon injection amounts are the carbon injection amount points between the maximum carbon injection amount and the minimum carbon injection amount under all working conditions during the actual injection process of the well; specifically, the different carbon injection amounts are taken in an arithmetic progression with adjacent carbon injection amount points, and the relationship between adjacent carbon injection amount points is increasing or decreasing;

[0043] It should be noted that those skilled in the art can select the carbon injection amount according to the actual production environment. Generally speaking, the value between adjacent carbon injection amounts should be determined according to whether the target well is greatly affected by carbon injection amount changes. If the influence is large, multiple carbon injection amount points with a smaller difference should be selected. Otherwise, those skilled in the art can appropriately select carbon injection amount points with a larger interval.

[0044] Preferably, in this embodiment, the correction coefficients of the injection pressures at the wellhead and the bottom hole at different carbon injection amounts and different temperatures are: the ratio between the injection pressures at the wellhead and the bottom hole.

[0045] Preferably, in this embodiment, multiple time points in the well refer to different carbon injection amounts during the production process of the well.

[0046] The present invention provides a system for correcting the apparent carbon injection indication curve, as Figure 4 shown, including:

[0047] A collection and processing module, configured to record the injection pressures at the wellhead and the bottom hole at different carbon injection amounts and different temperatures, and obtain the correction coefficients of the injection pressures at the wellhead and the bottom hole at different carbon injection amounts and different temperatures, so as to form a correction coefficient array;

[0048] A correction module, configured to correct the wellhead injection pressure to the bottom hole based on the correction coefficient array, the actual temperature, and the carbon injection amount during the injection process, so as to obtain the actual bottom hole pressures at multiple time points in the well;

[0049] An output module, configured to draw a corrected carbon injection indication curve of the bottom hole based on the multiple actual bottom hole pressures and the corresponding actual carbon injection amounts.

[0050] It should be noted that in this embodiment, the collection and processing module is a functional module for realizing data collection and subsequent processing work. This module generally includes other units such as sensors and controllers, which are used to obtain data from the external physical world and process and analyze these data; specifically, the collection and processing module will obtain data from the external environment through various sensors, such as temperature and pressure, and these data will be transmitted into the module and, after being processed and analyzed, can be used for various applications, such as monitoring, control, and decision-making.

[0051] In this embodiment, the correction module is a functional module for correcting or adjusting data. This module generally includes some algorithms and logics for identifying and fixing errors or inconsistencies in the data; specifically, the correction module may use various algorithms and technologies, such as machine learning and deep learning, to identify and fix problems in the data. It may perform operations such as data cleaning, duplicate removal, and filling missing values on the data to ensure the accuracy and consistency of the data; the design and implementation of the correction module need to consider many factors, such as the data source, format, quality, etc., as well as the correction objectives and requirements.

[0052] In this embodiment, the output module is used to realize functions such as signal output and control execution. It is usually connected to the loop bus of the controller and can be installed near the controlled device or in the floor terminal module box.

[0053] In another embodiment of the present invention, a computer device is provided. The computer device includes a processor and a memory. The memory is used to store a computer program, and the computer program includes program instructions. The processor is used to execute the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function. The processor described in the embodiment of the present invention can be used for the operation of a method for correcting a visual fixation carbon indication curve.

[0054] In another embodiment of the present invention, a storage medium is also provided, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in the computer device and is used to store programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and, of course, the extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, and the operating system of the terminal is stored in this storage space. And, one or more instructions suitable for being loaded and executed by the processor are also stored in this storage space. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. One or more instructions stored in the computer-readable storage medium can be loaded and executed by the processor to implement the corresponding steps of the method for correcting a visual fixation carbon indication curve in the above embodiment.

[0055] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0056] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices produce a means for implementing the functions specified in Figure 1 one or more of the processes or multiple processes and / or blocks Figure 1 one or more of the blocks or multiple blocks.

[0057] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction means that implements the functions specified in Figure 1 one or more of the processes or multiple processes and / or blocks Figure 1 one or more of the blocks or multiple blocks.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, such that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable devices provide steps for implementing the functions specified in Figure 1 one or more of the processes or multiple processes and / or blocks Figure 1 one or more of the blocks or multiple blocks.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calibrating a visual fixation carbon indication curve, characterized in that, Including the following steps: Record the injection pressures at the wellhead and the bottomhole at different carbon injection amounts and different temperatures, and obtain the correction coefficients of the injection pressures at the wellhead and the bottomhole at different carbon injection amounts and different temperatures, forming a correction coefficient array; During the injection process, based on the correction coefficient array, the actual temperature, and the carbon injection amount, correct the wellhead injection pressure to the bottomhole to obtain the actual bottomhole pressures at multiple time points in the well; Based on the multiple actual bottomhole pressures and the corresponding actual carbon injection amounts, plot the corrected carbon injection indication curve for the bottomhole.

2. The method for calibrating a carbon indication curve for visual fixation according to claim 1, wherein, The different temperatures are the temperature points between the maximum environmental temperature and the minimum environmental temperature of the well in this area.

3. The method for correcting the visual fixation carbon indication curve according to claim 1, wherein The different temperatures are taken in an arithmetic progression for adjacent temperature points, and the relationship between the adjacent temperature points is increasing or decreasing.

4. A method for correcting a visual fixation carbon indication curve according to claim 1, characterized in that, The different carbon injection amounts are the carbon injection amount values between the maximum carbon injection amount and the minimum carbon injection amount under all working conditions during the actual injection process of the well.

5. The method for correcting the visual fixation carbon indication curve according to claim 1, characterized in that, The different carbon injection amounts are taken in an arithmetic progression for adjacent carbon injection amount values, and the relationship between the adjacent carbon injection amount values is increasing or decreasing.

6. The method for calibrating the visual fixation carbon indication curve according to claim 1, characterized in that, The correction coefficients of the injection pressures at the wellhead and the bottomhole at different carbon injection amounts and different temperatures are: the ratio between the injection pressures at the wellhead and the bottomhole.

7. A method for correcting a visual fixation carbon indication curve according to claim 1, characterized in that, The multiple time points in the well are when there are different carbon injection amounts during the production process of the well.

8. A system for correcting a visual fixation carbon indication curve, characterized in that, Based on the method for correcting the apparent carbon injection indication curve according to any one of claims 1-7, it includes: An acquisition and processing module, configured to record the injection pressures at the wellhead and the bottomhole at different carbon injection amounts and different temperatures, and obtain the correction coefficients of the injection pressures at the wellhead and the bottomhole at different carbon injection amounts and different temperatures, forming a correction coefficient array; A correction module, configured to, during the injection process, based on the correction coefficient array, the actual temperature, and the carbon injection amount, correct the wellhead injection pressure to the bottomhole to obtain the actual bottomhole pressures at multiple time points in the well; An output module, configured to plot the corrected carbon injection indication curve for the bottomhole based on the multiple actual bottomhole pressures and the corresponding actual carbon injection amounts.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method for correcting the apparent carbon injection indication curve according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for correcting the apparent carbon injection indication curve according to any one of claims 1 to 7.

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