Method, system and equipment for determining formation starting pressure carbon absorption parameter and medium

Abstract

The invention belongs to the technical field of oil and gas exploitation, and relates to a method, a system and equipment for determining formation starting pressure carbon absorption parameters and a medium. According to the method, the carbon injection pressure difference is obtained according to the flowing bottomhole pressure, the carbon absorption curve is established according to the daily carbon injection amount and the carbon injection pressure difference, the slope of the carbon injection curve visually represents the stratum carbon absorption index, and the stratum carbon absorption capacity can be rapidly and more accurately evaluated; the starting pressure of the carbon injection stratum is obtained according to the carbon absorption curve, and a basis is provided for model selection of a carbon injection compressor or a carbon injection pump; according to the carbon injection formation starting pressure and the formation static pressure, the carbon injection minimum bottom hole pressure is obtained; the carbon absorption index is obtained according to the flowing bottomhole pressure, the daily carbon injection amount and the starting pressure of the carbon injection stratum, the stratum carbon absorption index accurately represents the stratum carbon absorption capacity, and a powerful basis can be provided for ground engineering construction, carbon dioxide injection oil displacement recovery ratio improving scheme compilation, carbon dioxide injection geological design and the like.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas extraction technology, and relates to a method, system, equipment and medium for determining formation start-up pressure carbon absorption parameters. Background Technology

[0002] Following the application of the water absorption index to evaluate formation water absorption capacity, the carbon absorption index is applied to characterize the formation's carbon absorption capacity. The carbon absorption index is defined as the daily carbon injection rate per unit carbon injection pressure difference under stable carbon injection conditions; specifically, it can be calculated as the ratio of the difference in daily carbon injection rate under two different carbon injection regimes to the difference in carbon injection pressure between the two regimes. However, this method does not consider the formation carbon injection initiation pressure, resulting in calculations that deviate from actual values.

[0003] Carbon injection formation initiation pressure refers to the pressure at which carbon injection begins to flow. Only when the carbon injection pressure differential is greater than the carbon injection formation initiation pressure can the injected carbon begin to flow formally in the formation.

[0004] For carbon-driven oil storage where carbon injection is required, if the formation pressure for carbon injection is not considered, the rated pressure of surface carbon injection pumps or compressors is often too low, which may result in the inability to inject carbon during the actual carbon injection process. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a method, system, equipment, and medium for determining formation start-up pressure carbon absorption parameters. The present invention obtains carbon absorption curves and then combines these curves to quickly, intuitively, and accurately obtain the formation start-up pressure for carbon injection, the minimum bottom-hole flowing pressure for carbon injection, and the carbon absorption index. This provides a strong basis for the selection of carbon injection compressors or pumps, carbon injection pipelines, etc., the preparation of carbon dioxide injection enhanced oil recovery schemes, and the geological design of carbon dioxide injection.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] In a first aspect, the present invention provides a method for determining formation start-up pressure carbon adsorption parameters, comprising the following steps:

[0008] Obtain bottom hole flowing pressure, daily carbon injection volume, and formation static pressure;

[0009] The carbon injection pressure differential is obtained based on the bottom hole flowing pressure, and a carbon absorption curve is established based on the daily carbon injection volume and the carbon injection pressure differential.

[0010] The initiation pressure of the carbon injection formation is obtained from the carbon absorption curve;

[0011] The minimum bottomhole flowing pressure for carbon injection is obtained based on the formation initiation pressure and formation static pressure.

[0012] The carbon absorption index is obtained based on the bottom hole flowing pressure, daily carbon injection volume, and carbon injection formation start-up pressure.

[0013] Furthermore, the process of obtaining the bottom hole flowing pressure and daily carbon injection amount is as follows:

[0014] Before system testing, sufficient carbon dioxide must be injected to ensure that the injected carbon forms a continuous phase from the wellhead to the wellbore, bottom of the well, and formation.

[0015] During the system testing process, carbon dioxide needs to be continuously injected to ensure a stable carbon injection rate.

[0016] Furthermore, when obtaining the bottom hole flowing pressure and daily carbon injection volume, at least four carbon injection operating regimes should be designed and the bottom hole flowing pressure and daily carbon injection volume under each regime should be recorded.

[0017] Furthermore, the specific method for obtaining the initiation pressure of the carbon injection formation based on the carbon uptake curve is as follows:

[0018] A linear expression for the daily carbon injection rate and carbon injection pressure difference is obtained based on the carbon absorption curve;

[0019] When the daily carbon injection volume is 0, the carbon injection pressure difference at this time is the carbon injection formation start-up pressure.

[0020] Furthermore, the linear expression for the daily carbon injection quantity and the carbon injection pressure difference is as follows:

[0021] y = ax + b, where y is the daily carbon injection amount, x is the carbon injection pressure difference, and a and b are constants.

[0022] Furthermore, the method for obtaining the minimum bottomhole flowing pressure for carbon injection based on the formation initiation pressure and formation static pressure is as follows:

[0023] The minimum bottomhole flowing pressure for carbon injection is obtained by adding the formation static pressure to the formation initiation pressure.

[0024] Furthermore, the formula for obtaining the carbon absorption index based on bottom hole flowing pressure, daily carbon injection volume, and formation initiation pressure is as follows:

[0025]

[0026] In the formula, Ig represents the carbon absorption index, and G inj Δp represents the daily carbon injection rate, and p represents the unit bottom hole pressure difference. wf p represents the bottom hole flowing pressure. r p represents the static pressure of the formation. q This indicates the initiation pressure of the carbon injection formation.

[0027] Secondly, the present invention provides a system for determining formation initiation pressure carbon absorption parameters, comprising a data acquisition module, a carbon absorption curve establishment module, an initiation pressure acquisition module, a minimum bottomhole flowing pressure acquisition module, and a carbon absorption index acquisition module connected in sequence, wherein:

[0028] Data acquisition module: used to acquire bottom hole flowing pressure, daily carbon injection, and formation static pressure;

[0029] Carbon absorption curve establishment module: used to obtain the carbon injection pressure difference based on the bottom hole flowing pressure, and to establish a carbon absorption curve based on the daily carbon injection volume and the carbon injection pressure difference;

[0030] Start-up pressure acquisition module: used to acquire the start-up pressure of the carbon injection formation based on the carbon uptake curve;

[0031] Minimum bottomhole flowing pressure acquisition module: used to obtain the minimum bottomhole flowing pressure for carbon injection based on the formation initiation pressure and formation static pressure;

[0032] Carbon absorption index acquisition module: used to obtain the carbon absorption index based on bottom hole flowing pressure, daily carbon injection volume, and carbon injection formation start-up pressure.

[0033] Thirdly, the present invention provides an electronic device, comprising: a processor; a memory for storing computer program instructions; and steps for implementing a method for determining formation start-up pressure carbon adsorption parameters when executing the computer program.

[0034] Fourthly, the present invention provides a storage medium storing computer program instructions, which are loaded and executed by a processor, wherein the processor performs a method for determining formation start-up pressure carbon adsorption parameters.

[0035] Fifthly, the present invention provides a computer program product, the computer program product comprising computer instructions, characterized in that the computer instructions instruct a computer to execute a method for determining formation start-up pressure carbon adsorption parameters.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The carbon absorption parameters of this invention include the formation initiation pressure for carbon injection, the minimum bottomhole flowing pressure for carbon injection, and the carbon absorption index. The carbon injection pressure differential is obtained based on the bottomhole flowing pressure. A carbon absorption curve is established based on the daily carbon injection volume and the carbon injection pressure differential. The slope of the carbon injection curve visually represents the formation carbon absorption index, enabling rapid and more accurate evaluation of the formation's carbon absorption capacity. The formation initiation pressure for carbon injection is obtained from the carbon absorption curve, providing a basis for selecting the carbon injection compressor or pump. The minimum bottomhole flowing pressure for carbon injection is obtained based on the formation initiation pressure and formation static pressure. The carbon absorption index is obtained based on the bottomhole flowing pressure, daily carbon injection volume, and formation initiation pressure. The formation carbon absorption index accurately characterizes the formation's carbon absorption capacity and can provide strong support for surface engineering construction, the development of carbon dioxide injection enhanced oil recovery schemes, and the geological design of carbon dioxide injection.

[0038] 2. The system of this invention includes a data acquisition module, a carbon absorption curve establishment module, a start-up pressure acquisition module, a minimum bottom hole flowing pressure acquisition module, and a carbon absorption index acquisition module connected in sequence. Specifically: the data acquisition module is used to acquire the bottom hole flowing pressure, daily carbon injection volume, and formation static pressure; the carbon absorption curve establishment module is used to acquire the carbon injection pressure difference based on the bottom hole flowing pressure and to establish a carbon absorption curve based on the daily carbon injection volume and the carbon injection pressure difference; the start-up pressure acquisition module is used to acquire the carbon injection formation start-up pressure based on the carbon absorption curve; the minimum bottom hole flowing pressure acquisition module is used to acquire the minimum bottom hole flowing pressure for carbon injection based on the carbon injection formation start-up pressure and formation static pressure; and the carbon absorption index acquisition module is used to acquire the carbon absorption index based on the bottom hole flowing pressure, daily carbon injection volume, and carbon injection formation start-up pressure. The various modules work together to accurately obtain carbon absorption curves. By combining these curves, the formation initiation pressure, minimum bottom-hole flowing pressure, and carbon absorption index of carbon injection can be obtained quickly, intuitively, and accurately. This provides a strong basis for the selection of carbon injection compressors or pumps, carbon injection pipelines, the preparation of carbon dioxide injection enhanced oil recovery schemes, and the geological design of carbon dioxide injection.

[0039] 3. The equipment, media, and computer program products of this invention can also accurately obtain carbon absorption curves. In combination with the carbon absorption curves, the formation start-up pressure, minimum bottom hole flowing pressure, and carbon absorption index of carbon injection can be obtained quickly, intuitively, and accurately. This provides a strong basis for the selection of carbon injection compressors or pumps, carbon injection pipelines, etc., the preparation of carbon dioxide injection enhanced oil recovery schemes, and the geological design of carbon dioxide injection. Attached Figure Description

[0040] Figure 1 This is a well carbon uptake curve diagram according to an embodiment of the present invention;

[0041] Figure 2 This is a flowchart of the method of the present invention;

[0042] Figure 3 This is a system module diagram of the present invention. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] The present invention will now be described in further detail with reference to the accompanying drawings:

[0046] See Figure 2 This invention discloses a method for determining formation start-up pressure carbon adsorption parameters, comprising the following steps:

[0047] S1. Obtain bottom hole flowing pressure, daily carbon injection volume, and formation static pressure;

[0048] Preferably, the formation static pressure is obtained by static temperature and static pressure gradient testing.

[0049] Preferably, a system well test is conducted during the process of obtaining bottom hole flowing pressure and daily carbon injection.

[0050] Before system testing, a sufficient amount of carbon dioxide is injected to ensure that the carbon injection volume forms a continuous phase from the wellhead to the wellbore, bottom of the well, and formation.

[0051] During the system testing process, carbon dioxide was continuously injected to ensure a stable carbon injection rate.

[0052] Preferably, when obtaining the bottom hole flowing pressure and daily carbon injection volume, at least four carbon injection working regimes are designed and the bottom hole flowing pressure and daily carbon injection volume under each regime are recorded.

[0053] Systematic well testing, also known as stable well testing, is a commonly used well testing technique in oil and gas field development. It primarily involves systematically and gradually changing the operating conditions of the oil or gas well, such as altering the nozzle diameter, injection rate, stroke, and number of strokes. Then, under each operating condition, parameters such as bottom hole pressure, oil, gas, and water production, sand content, and oil-gas ratio are measured. The main purpose of this testing method is to obtain the flow characteristics of the well and reservoir, providing direct information for rationally determining the development plan for the oil and gas well.

[0054] S2. Obtain the carbon injection pressure difference based on the bottom hole flowing pressure, and establish a carbon absorption curve based on the daily carbon injection volume and the carbon injection pressure difference;

[0055] S3. Obtain the initiation pressure of the carbon injection formation based on the carbon absorption curve, as detailed below:

[0056] A linear expression for the daily carbon injection rate and carbon injection pressure difference is obtained based on the carbon absorption curve;

[0057] The linear expression for the daily carbon injection volume and the carbon injection pressure difference is as follows:

[0058] y = ax + b

[0059] Where y is the daily carbon injection amount, x is the carbon injection pressure difference, and a and b are constants;

[0060] When the daily carbon injection volume is 0, the carbon injection pressure difference at this time is the carbon injection formation start-up pressure.

[0061] S4. Obtain the minimum bottomhole flowing pressure for carbon injection based on the formation initiation pressure and formation static pressure, as detailed below:

[0062] The minimum bottomhole flowing pressure for carbon injection is obtained by adding the formation static pressure to the formation initiation pressure.

[0063] S5. The carbon absorption index is obtained based on the bottom hole flowing pressure, daily carbon injection rate, and carbon injection formation start-up pressure. The specific formula is as follows:

[0064]

[0065] In the formula, Ig represents the carbon absorption index, and G inj Δp represents the daily carbon injection rate, and p represents the unit bottom hole pressure difference. wf p represents the bottom hole flowing pressure. r p represents formation pressure. q This indicates the initiation pressure of the carbon injection formation.

[0066] See Figure 2 In another feasible embodiment of the present invention, the following modifications are made as needed. The bottom hole flowing pressure, daily carbon injection rate, and formation static pressure are obtained. The carbon injection pressure differential is obtained based on the bottom hole flowing pressure. A carbon absorption curve is established based on the daily carbon injection rate and the carbon injection pressure differential. The slope of the carbon injection curve visually represents the formation carbon absorption index, enabling rapid and more accurate evaluation of the formation's carbon absorption capacity. The formation initiation pressure for carbon injection is obtained based on the carbon absorption curve, providing a basis for selecting a carbon injection compressor or pump. The minimum bottom hole flowing pressure for carbon injection is obtained based on the formation initiation pressure and formation static pressure. The carbon absorption index is obtained based on the bottom hole flowing pressure, daily carbon injection rate, and formation initiation pressure. The formation carbon absorption index accurately characterizes the formation's carbon absorption capacity and provides a strong basis for surface engineering construction, the development of carbon dioxide injection enhanced oil recovery schemes, and carbon dioxide injection geological design. Surface engineering construction includes the selection of carbon injection compressors or pumps and carbon injection pipelines. The method of the present invention can accurately obtain three carbon absorption parameters: the formation initiation pressure for carbon injection, the minimum bottom hole flowing pressure for carbon injection, and the carbon absorption index.

[0067] Example 1:

[0068] See Figure 2 This embodiment discloses a method for determining formation start-up pressure carbon adsorption parameters, including the following steps:

[0069] S1. Obtain basic analysis data;

[0070] Basic analysis data is obtained by conducting system well tests. Before the system well test, sufficient carbon dioxide needs to be injected to ensure that the carbon injection volume forms a continuous phase from the wellhead to the wellbore, bottom of the well, and formation. During the system well test, carbon dioxide needs to be continuously injected to ensure that the carbon injection volume is stable. Under the premise of stable carbon injection, at least four carbon injection working systems should be designed and the wellhead carbon injection oil pressure, bottom hole flowing pressure, and daily carbon injection volume under each system should be recorded.

[0071] The X well system test recorded basic analysis data of wellhead carbon injection oil pressure, bottom hole flowing pressure, and daily carbon injection volume under four carbon injection regimes (40.08, 65.04, 90.00, and 114.96 t / d), as detailed in Table 1.

[0072] Table 1. Basic Analysis Data of Well X:

[0073] Carbon injection system Wellhead carbon oil injection pressure (MPa) Bottom hole flowing pressure (MPa) Daily carbon injection (t / d) System 1 22.06 64.016 40.08 System 2 25.55 68.406 65.04 System 3 28.15 71.792 90.0 System 4 31.25 76.249 114.96

[0074] S2. Establish carbon absorption curve

[0075] After obtaining the formation static pressure, the formation static pressure is obtained by static temperature and static pressure gradient test. Based on the bottom hole flowing pressure under different carbon injection regimes in the system well test, the carbon injection pressure difference under different carbon injection regimes can be calculated. Then, a carbon absorption curve is established based on the daily carbon injection volume and the carbon injection pressure difference.

[0076] The formation static pressure during the static temperature and static pressure gradient test of Well X was 49.705 MPa. Based on the basic analysis data from the system well test, the carbon injection pressure differential under different carbon injection regimes was calculated, as shown in Table 2. Based on the carbon absorption curve data in Table 2, curves of daily carbon injection rate versus carbon injection pressure differential under different carbon injection regimes were established, i.e., carbon absorption curves. (See Table 2 for details.) Figure 1 .

[0077] Table 2. Carbon absorption curve data table:

[0078]

[0079]

[0080] S3. Calculate the initiation pressure of carbon injection formation;

[0081] According to the linear expression of the carbon injection curve, when the daily carbon injection volume is 0, the corresponding carbon injection pressure difference is the starting pressure of the carbon injection formation.

[0082] Depend on Figure 1 The linear expression for the carbon absorption curve of well X is as follows:

[0083] y = 6.21x - 49.232

[0084] Where y is the daily carbon injection amount, and x is the carbon injection pressure difference;

[0085] When the daily carbon injection volume y is 0, the corresponding carbon injection pressure difference is 7.928 MPa; therefore, the formation initiation pressure for carbon injection in well X is 7.928 MPa.

[0086] S4. Calculate the minimum bottom hole flowing pressure;

[0087] By adding the calculated formation initiation pressure to the formation static pressure, the minimum bottomhole flowing pressure for carbon injection can be obtained. The minimum bottomhole flowing pressure for carbon injection refers to the minimum bottomhole flowing pressure required for carbon injection in a carbon injection well, which determines the selection of the carbon injection device.

[0088] The formation initiation pressure for carbon injection in Well X is 7.928 MPa, the formation static pressure is 49.705 MPa, and the minimum bottomhole flowing pressure for carbon injection is 57.633 MPa.

[0089] S5. Calculate the carbon absorption index;

[0090] The carbon absorption index is defined as the daily carbon injection rate per unit bottom hole pressure differential under stable carbon injection conditions; its magnitude characterizes the formation's carbon absorption capacity, and its calculation expression is as follows:

[0091]

[0092] In the formula, Ig represents the carbon absorption index, and G inj Δp represents the daily carbon injection rate, and p represents the unit bottom hole pressure difference. wf p represents the bottom hole flowing pressure. r p represents formation pressure. q This indicates the initiation pressure of the carbon injection formation.

[0093] To make the calculation results more accurate, the slope of the carbon absorption curve can be used.

[0094] Based on the carbon absorption curve of well X, its slope can be intuitively read as a carbon absorption index of 6.21t / (d.MPa) considering the formation initiation pressure.

[0095] The method for determining formation start-up pressure carbon uptake parameters of this invention specifically includes rapidly and accurately calculating the carbon injection start-up pressure based on the carbon uptake curve, and accurately solving the formation carbon uptake index by applying a carbon uptake index that takes the start-up pressure into account. The formation carbon uptake index calculated by this method accurately characterizes the formation's carbon uptake capacity, and can provide a strong basis for surface engineering construction, the preparation of carbon dioxide injection enhanced oil recovery schemes, and the geological design of carbon dioxide injection. Surface engineering construction includes the selection of carbon injection compressors or pumps, carbon injection pipelines, etc.

[0096] In summary, the beneficial effects of the present invention are as follows:

[0097] 1. When the daily carbon injection rate is 0, the carbon injection start-up pressure can be quickly determined based on the carbon injection curve, providing a basis for the selection of carbon injection compressor or carbon injection pump;

[0098] 2. The slope of the carbon injection curve directly represents the carbon uptake index of the formation, and it is a carbon uptake index that takes into account the formation initiation pressure, which can quickly and more accurately evaluate the carbon uptake capacity of the formation.

[0099] 3. When determining the formation static pressure, the formation static pressure is usually obtained by static temperature and static pressure gradient testing, which can determine the minimum bottom hole flowing pressure for carbon injection;

[0100] 4. Various parameters can be obtained quickly, intuitively, and accurately based on the carbon injection curve.

[0101] Based on the above method, this invention also discloses a system for determining formation start-up pressure carbon uptake parameters, see [link to relevant documentation]. Figure 3 It includes a data acquisition module, a carbon absorption curve establishment module, a start-up pressure acquisition module, a minimum bottom hole flowing pressure acquisition module, and a carbon absorption index acquisition module connected in sequence, wherein:

[0102] Data acquisition module: used to acquire bottom hole flowing pressure, daily carbon injection, and formation static pressure;

[0103] Carbon absorption curve establishment module: used to obtain the carbon injection pressure difference based on the bottom hole flowing pressure, and to establish a carbon absorption curve based on the daily carbon injection volume and the carbon injection pressure difference;

[0104] Start-up pressure acquisition module: used to acquire the start-up pressure of the carbon injection formation based on the carbon uptake curve;

[0105] Minimum bottomhole flowing pressure acquisition module: used to obtain the minimum bottomhole flowing pressure for carbon injection based on the formation initiation pressure and formation static pressure;

[0106] Carbon absorption index acquisition module: used to obtain the carbon absorption index based on bottom hole flowing pressure, daily carbon injection volume, and carbon injection formation start-up pressure.

[0107] The various modules work together to accurately obtain carbon absorption curves. By combining these curves, the formation initiation pressure, minimum bottom-hole flowing pressure, and carbon absorption index of carbon injection can be obtained quickly, intuitively, and accurately. This provides a strong basis for the selection of carbon injection compressors or pumps, carbon injection pipelines, the preparation of carbon dioxide injection enhanced oil recovery schemes, and the geological design of carbon dioxide injection.

[0108] An electronic device includes: a processor; a memory for storing computer program instructions; and steps for determining the formation initiation pressure carbon adsorption parameters when executing the computer program.

[0109] A storage medium storing computer program instructions, which, when loaded and executed by a processor, enable the processor to perform a method for determining formation initiation pressure carbon adsorption parameters.

[0110] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0111] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0112] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0113] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0114] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for determining formation start-up pressure carbon uptake parameters, characterized in that, Includes the following steps: Obtain bottom hole flowing pressure, daily carbon injection volume, and formation static pressure; The carbon injection pressure differential is obtained based on the bottom hole flowing pressure, and a carbon absorption curve is established based on the daily carbon injection volume and the carbon injection pressure differential. The initiation pressure of the carbon injection formation is obtained from the carbon absorption curve; The minimum bottomhole flowing pressure for carbon injection is obtained based on the formation initiation pressure and formation static pressure. The carbon absorption index is obtained based on the bottom hole flowing pressure, daily carbon injection volume, and carbon injection formation start-up pressure.

2. The method for determining formation initiation pressure carbon uptake parameters according to claim 1, characterized in that, The process of obtaining bottom hole flowing pressure, daily carbon injection, and formation static pressure involves conducting a system well test. Before system testing, a sufficient amount of carbon dioxide is injected to ensure that the carbon injection volume forms a continuous phase from the wellhead to the wellbore, bottom of the well, and formation. During the system testing process, carbon dioxide was continuously injected to ensure a stable carbon injection rate.

3. The method for determining formation initiation pressure carbon uptake parameters according to claim 2, characterized in that, When obtaining the bottom hole flowing pressure and daily carbon injection volume, at least four carbon injection working regimes should be designed and the bottom hole flowing pressure and daily carbon injection volume under each regime should be recorded.

4. The method for determining formation start-up pressure carbon adsorption parameters according to claim 1, characterized in that, The method for obtaining the carbon injection formation initiation pressure based on the carbon absorption curve is as follows: A linear expression for the daily carbon injection rate and carbon injection pressure difference is obtained based on the carbon absorption curve; When the daily carbon injection volume is 0, the carbon injection pressure difference at this time is the carbon injection formation start-up pressure.

5. The method for determining formation initiation pressure carbon uptake parameters according to claim 4, characterized in that, The linear expression for the daily carbon injection amount and carbon injection pressure difference is as follows: y = ax + b Where y is the daily carbon injection amount, x is the carbon injection pressure difference, and a and b are constants.

6. The method for determining formation initiation pressure carbon uptake parameters according to claim 1, characterized in that, The method for obtaining the minimum bottomhole flowing pressure for carbon injection based on the formation initiation pressure and formation static pressure is as follows: The minimum bottomhole flowing pressure for carbon injection is obtained by adding the formation static pressure to the formation initiation pressure.

7. The method for determining formation initiation pressure carbon uptake parameters according to claim 1, characterized in that, The formula for obtaining the carbon absorption index based on bottom hole flowing pressure, daily carbon injection rate, and formation initiation pressure is as follows: In the formula, Ig represents the carbon absorption index, and G inj Δp represents the daily carbon injection rate, and p represents the unit bottom hole pressure difference. wf p represents the bottom hole flowing pressure. r p represents the static pressure of the formation. q This indicates the initiation pressure of the carbon injection formation.

8. A system for determining formation start-up pressure carbon adsorption parameters for implementing the method of any one of claims 1 to 7, characterized in that, It includes, in sequence, a data acquisition module, a carbon absorption curve establishment module, a start-up pressure acquisition module, a minimum bottom hole flowing pressure acquisition module, and a carbon absorption index acquisition module, wherein: Data acquisition module: used to acquire bottom hole flowing pressure, daily carbon injection, and formation static pressure; Carbon absorption curve establishment module: used to obtain the carbon injection pressure difference based on the bottom hole flowing pressure, and to establish a carbon absorption curve based on the daily carbon injection volume and the carbon injection pressure difference; Start-up pressure acquisition module: used to acquire the start-up pressure of the carbon injection formation based on the carbon uptake curve; Minimum bottomhole flowing pressure acquisition module: used to obtain the minimum bottomhole flowing pressure for carbon injection based on the formation initiation pressure and formation static pressure; Carbon absorption index acquisition module: used to obtain the carbon absorption index based on bottom hole flowing pressure, daily carbon injection volume, and carbon injection formation start-up pressure.

9. An electronic device, comprising: A processor; a memory, an electronic device for storing computer program instructions; characterized in that, when executing the computer program, it implements the steps of determining the formation initiation pressure carbon adsorption parameters as described in any one of claims 1-8.

10. A storage medium storing computer program instructions, characterized in that, When the computer program instructions are loaded and run by the processor, the processor executes the method for determining the formation initiation pressure carbon adsorption parameters as described in any one of claims 1-7.

11. A computer program product, said computer program product comprising computer instructions, characterized in that, The computer instructions instruct the computer to execute the method for determining the formation initiation pressure carbon adsorption parameters as described in any one of claims 1-7.

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