Oil well production initial stage yield splitting method based on logging gas chromatography data, electronic equipment and medium

Abstract

The invention belongs to the technical field of oil and gas exploration and development, and discloses an oil well production initial stage yield splitting method based on logging gas chromatography data, electronic equipment and a medium, and the method comprises the following steps: establishing a standard interpretation evaluation chart marked with a water content interval boundary by using four pieces of water logging degree related data I obtained by early stage oil testing production; and determining the moisture content interval of each single layer according to the position where the water logging degree related data II of each single layer of the to-be-split layer falls into the standard interpretation and evaluation chart, and then performing splitting. According to the method, the influence of different water logging degrees on the single-layer water content is fully considered, the splitting result is closer to the real situation, the accuracy is higher, the application scene of electronic equipment and media based on the method is widened, and the method is suitable for oil well yield splitting so as to evaluate the single-layer remaining oil potential.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas exploration and development technology, and relates to a production splitting method, specifically a production splitting method for oil wells in the initial production stage based on well logging gas chromatography data, as well as electronic equipment and media. Background Technology

[0002] In reservoir development, assessing remaining oil potential is a crucial aspect of reservoir engineering research. To conduct this assessment, the cumulative production of individual layers must first be determined. However, to improve economic efficiency, oil wells commonly employ multi-layer commingled production methods. The total production from commingled production includes the total oil and water production from all producing layers. Therefore, accurately allocating the total oil and water production to each individual layer to obtain more precise individual layer oil and water production figures is critical to determining the cumulative production of different layers, and consequently, to assessing the remaining oil potential of each layer.

[0003] Existing production fractionation methods mainly include dynamic and static methods. The dynamic method relies primarily on production profile data. Its advantage is that all data is based on actual measurements, resulting in high accuracy. However, it suffers from stringent requirements for production profile measurement conditions, particularly regarding total production volume and production tubing. Therefore, in many cases, actual measurements cannot be performed to complete dynamic production fractionation. The static method, relying on reservoir property data, while simple to calculate and applicable throughout the entire production cycle, still suffers from the drawback of considering only a single factor. In particular, the water cut of each individual layer can only be uniformly adopted as the average water cut, leading to low fractionation accuracy.

[0004] Therefore, there is still a lack of a simple calculation method that can determine the specific moisture content of different single layers for yield splitting. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention utilizes well logging gas chromatography data obtained during early-stage oil testing and production to establish a standard interpretation and evaluation chart. This chart determines the water cut range corresponding to different degrees of water flooding. By comparing each well layer in the initial production phase with the standard interpretation and evaluation chart, the water cut range of each layer is obtained. This allows the water cut data of each layer to be incorporated into production segmentation, thereby improving the accuracy of segmentation.

[0006] Another objective of this invention is to provide an electronic device and a computer-readable storage medium for the above-mentioned method of splitting the initial production output of oil wells based on logging gas chromatography data.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for dividing the initial production of oil wells based on well logging gas chromatography data is proposed. It utilizes the water flooding degree related data I obtained from the early oil trial production to establish a standard interpretation and evaluation chart marked with the water cut interval boundary line; the water cut interval of each layer is determined by the position of the water flooding degree related data II of each single layer to be divided falling into the standard interpretation and evaluation chart, and then the division is carried out.

[0009] The data related to the degree of flooding includes: the ratio of pterostilbene to n-heptadecane. The ratio of phytane to n-octadecane Light and heavy component ratio and

[0010] The above four parameters can be directly found in the gas chromatography analysis results table. Their specific meanings are as follows:

[0011] The ratio of psarcosine to nC17. During water flooding, because psarcosine has better stability and corrosion resistance than nC17, this value tends to increase with the degree of water flooding.

[0012] The ratio of phytane to nC18. During water-driven oil recovery, because phytane has better stability and corrosion resistance than nC17, this value tends to increase with the degree of water flooding.

[0013] The light-heavy component ratio is the ratio of the total mass fraction of hydrocarbons before nC21 to the total mass fraction of hydrocarbons after nC22 in a set of chromatographic peaks. During water-driven oil recovery, lighter components are preferentially driven; therefore, this value decreases with increasing water flooding.

[0014] The ratio of the sum of the mass fractions of nC21 and nC22 hydrocarbons to the sum of the mass fractions of nC28 and nC29 hydrocarbons in a set of chromatographic peaks. During water-driven oil recovery, lighter components are preferentially driven; therefore, this value decreases with increasing water flooding.

[0015] The water cut range can be determined according to the relevant oilfield water flooding level classification standards, or it can be adjusted by those skilled in the art based on different geological and development conditions.

[0016] As a limitation of the present invention, it includes the following steps performed sequentially:

[0017] S1. Take the water flooding degree related data I corresponding to each water cut well layer from the well logging gas chromatography analysis results obtained in the early oil trial and production, and establish an interpretation and evaluation chart;

[0018] The degree of flooding is classified according to the level of moisture content, and the moisture content range corresponding to different levels of flooding is determined. The boundary line of the moisture content range is marked in the interpretation and evaluation chart to obtain the standard interpretation and evaluation chart.

[0019] S2. Take the flooding degree related data II for each single layer to be split into layers, and input them into the standard interpretation evaluation chart. Based on the two boundary lines where the flooding degree related data II falls, determine the water content range of each single layer.

[0020] S3. The total liquid production of the layer to be split is divided using the KH coefficient method, and the liquid production of each single layer is calculated.

[0021] S4. Given the water cut value of each layer, calculate the oil production and water production of each layer. Adjust the water cut value of each layer to other values ​​within its water cut range, calculate the corresponding oil production and water production of each layer until the sum of the production of each layer equals the corresponding total production, and output the oil production and water production of each layer.

[0022] As a further limitation of the present invention, the flooding level is divided into no flooding, low flooding, medium flooding, high flooding and extremely high flooding; the corresponding water content ranges are (0, 20%), [20%, 40%), [40%, 80%), [80%, 90%) and [90%, 100%), respectively.

[0023] As a further limitation of the present invention, in step S3, the formula for calculating the liquid production of each single layer is as follows:

[0024]

[0025] In the formula, Q i The yield of a single layer is divided into fractions, t;

[0026] Q represents the total liquid production, in tons.

[0027] K i The permeability of a single layer, in μm²;

[0028] H i Let the thickness of a single reservoir layer be m;

[0029] i represents the single-layer sequence number, and n represents the total number of layers in production.

[0030] As a further limitation of the present invention, the output oil production and water production of a single layer shall satisfy the following conditions:

[0031] f iMin ≤f i ≤f iMax ;

[0032] Q 油i =Qi ×(1-f i );

[0033] Q 水i =Q i ×f i ;

[0034] Q = Q1 + Q2 + ... + Q n ;

[0035] In the formula, f i The water content of a single layer;

[0036] f iMin The lower limit of moisture content for a given single layer;

[0037] f iMax The upper limit of moisture content for a given single layer;

[0038] Q 油i For a single layer of oil production;

[0039] Q 水i The water production of a single layer.

[0040] This invention also provides an electronic device for a method of splitting the initial production of an oil well based on well logging gas chromatography data, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned method of splitting the initial production of an oil well based on well logging gas chromatography data.

[0041] The present invention also provides a computer-readable storage medium storing a computer program that executes the above-described method for splitting the initial production output of an oil well based on logging gas chromatography data.

[0042] By adopting the above-described technical solution, the beneficial effects achieved by this invention compared to the prior art are as follows:

[0043] The splitting method of this invention fully utilizes four water flooding degree-related data from the logging gas chromatography data of similar well layers in the early stage. Using these four specific data as key information, a standard interpretation and evaluation chart marked with water cut interval boundaries is established as a reference standard for newly put into production wells to be split. In this way, the four water flooding degree-related data of a single well layer to be split can be projected onto the standard interpretation and evaluation chart. The two adjacent water cut interval boundaries are found based on the position of the data points on the chart. The boundary line with the larger water cut is the upper limit of the water cut interval of the well layer, and the boundary line with the smaller water cut is the lower limit of the water cut interval, thus finally determining the water cut interval of this single layer.

[0044] This invention incorporates the water cut range of a single layer into the splitting calculation, which, compared to using the average water cut of the entire oil well for splitting, fully considers the differences in water cut at different water flooding levels, resulting in more accurate output results and providing a basis for subsequent wellhead testing and residual oil assessment.

[0045] This invention is applicable to production splitting in the early stages of oil well commissioning, and the electronic equipment and media based on the method of this invention broaden the application scenarios. Attached Figure Description

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] Figure 1 This is the standard interpretation and evaluation diagram obtained in S1 of Embodiment 1 of the present invention;

[0048] Figure 2 This is the explanatory evaluation diagram obtained in S2 of Embodiment 1 of the present invention. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that the described embodiments are only used to explain the present invention and do not limit the present invention.

[0050] Example 1: A method for splitting the initial production output of oil wells based on well logging gas chromatography data.

[0051] In this embodiment, for well C15 (n=4) in a certain oilfield, which has four production layers, the oil and water production during the initial production stage from November 2013 to May 2014 was allocated to specific sand bodies using an oil well production allocation method based on well logging gas chromatography data. The sand body number for each production layer is 70. # 75 # 77 # and 79 # As of May 2014, the well's cumulative total fluid production was Q = 688t, of which 259t was oil and 429t was water.

[0052] The specific method includes the following steps performed sequentially:

[0053] S1. Take the ratio of pterosane to n-heptadecane from the well logging gas chromatography analysis results obtained in the early oil trial and production. The ratio of phytane to n-octadecane Light and heavy component ratio and (Flooding severity data I), establish an interpretation and evaluation chart;

[0054] Referring to the enterprise standard Q / SY 01459-2019 of China National Petroleum Corporation: the identification and compliance rate statistical specification of well logging interpretation conclusions, the water flooding degree of oil wells is divided into levels based on water cut from 0 to 100%, and the water cut range corresponding to different levels of water flooding degree is determined, as shown in Table 1.

[0055] Table 1. Moisture content ranges corresponding to different levels of flooding.

[0056] Flooding severity levels The range (%) of moisture content f Extremely high flood 90≤f＜100 High water level 80≤f＜90 Flooding 40≤f＜80 Low water level 20≤f＜40 Not flooded 0＜f＜20

[0057] In the interpretation and evaluation chart, based on the moisture content range corresponding to each flooding level, the boundary lines of the moisture content ranges are marked, namely the boundary lines of 0%, 20%, 40%, 80%, 90%, and 100% moisture content, resulting in the standard interpretation and evaluation chart, such as... Figure 1 ;

[0058] S2. Take 70 layers from Table 1 to be split. # 75 # 77 # and 79 # The relevant data on the degree of flooding for each individual layer (II) are input into the standard interpretation and evaluation chart.

[0059] Project the relevant data II of each flooding degree of each single layer onto the standard interpretation evaluation chart and connect the points. Then, use the two adjacent boundary lines to determine the water content range of each single layer.

[0060] The boundary line with higher water content is taken as the upper limit of the water content range of the well layer, and the boundary line with lower water content is taken as the lower limit of the water content range. The results of the water content ranges for each layer to be split are shown in Table 2 and 3. Figure 2 As shown, 75 # 77 # and 79 # The relevant data on the degree of flooding (II) are all located between the boundary line of 40% water content and the boundary line of 80% water content. Therefore, the water content range of these three single layers is the same, which is 40% to 80%.

[0061] Table 2. Results of moisture content ranges for each layer to be split.

[0062]

[0063] S3. Treating splitting layers 70 # 75 # 77 # and 79 # The total liquid production Q = 688t. The KH coefficient method is used for partitioning, and the liquid production of each individual layer is calculated using the following formula:

[0064]

[0065] In the formula, Q i The yield of a single layer is divided into fractions, t;

[0066] Q represents the total liquid production, in tons.

[0067] K i The permeability of a certain monolayer, in μm 2 ;

[0068] H i Let be the thickness of a single reservoir layer, in meters (m).

[0069] 70 layers to be split # The calculation process for the liquid production is as follows:

[0070] Physical property parameter K1 = 51.58 × 10 -3 μm 2 , H1=1.4m, K1H1=72.212×10 -3 μm 2 ·m.

[0071] Then 70 # The liquid production rate of a single sand body layer is:

[0072]

[0073] Similarly, calculate the 75 layers to be split. # 77 # and 79 # The liquid production, physical properties and calculation results are shown in Table 3;

[0074] Table 3. Physical properties and calculation results of each layer to be split.

[0075]

[0076] S4. Given any value in the water cut range of Table 2 for each layer, calculate the oil production and water production of each layer. Continuously adjust the water cut value of each layer to other values ​​within its water cut range, and then calculate the corresponding oil production and water production of each layer until the sum of the oil production of each layer equals the total oil production of 259t and the sum of the water production of each layer equals the total water production of 429t. This completes the splitting. Output the oil production and water production of each layer at this time. The results are shown in Table 4.

[0077] At this point, the output oil production and water production of a single layer satisfy the following conditions:

[0078] f iMin ≤f i ≤f iMax ;

[0079] Q 油i =Q i ×(1-f i );

[0080] Q 水i =Q i ×f i ;

[0081] Q = Q1 + Q2 + Q3 + Q4;

[0082] In the formula, f i The water content of a single layer;

[0083] f iMin The lower limit of moisture content for a given single layer;

[0084] f iMax The upper limit of moisture content for a given single layer;

[0085] Q 油i For a single layer of oil production;

[0086] Q 水i The water production of a single layer.

[0087] Table 4. Results of oil and water production for each individual layer

[0088]

[0089] Based on the results in Table 4, the evaluation results for each single layer are: 70 # The first layer has low water flooding and high oil production, making it the main source of oil production; the other three layers have relatively high water flooding, but 75 # 79 # Oil production higher than 77 # Verification has shown that, compared to splitting the sample using average moisture content, the results obtained by this invention are more consistent with subsequent yield conditions. Therefore, this embodiment uses 70... # 75 # 77 # and 79 # The water cut range of each single layer is included in the split calculation. Compared with the general use of the average water cut of the entire oil well for splitting, the difference in water cut of different water flooding levels is fully considered, and the output results are more accurate.

[0090] In other embodiments, the water content range is divided by those skilled in the art according to different geological and development conditions, into low water content, medium water content, high water content, and ultra-high water content levels; the corresponding water content ranges are (0, 25%), [25%, 50%), [50%, 75%), and [75%, 100%), respectively. By adjusting according to the above embodiments, the resulting splitting results, taking into account the differences in water content at different flooding levels, have higher accuracy than those using the average water content.

[0091] Example 2: A computer device

[0092] This embodiment provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, to implement the method for splitting the initial production of oil wells based on logging gas chromatography data according to Embodiment 1.

[0093] This memory is used to store non-transitory computer-readable instructions. Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory. The non-volatile memory may, for example, include read-only memory (ROM), hard disk, flash memory, etc.

[0094] The processor may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. The processor is used to execute computer-readable instructions stored in the memory.

[0095] Those skilled in the art will understand that, in order to solve the technical problem of how to achieve a good user experience, this embodiment may also include well-known structures such as communication buses and interfaces, and these well-known structures should also be included within the protection scope of this disclosure.

[0096] For a detailed description of this embodiment, please refer to the corresponding descriptions in the foregoing embodiments, which will not be repeated here.

[0097] Example 3: A computer-readable storage medium

[0098] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a method for splitting the initial production output of an oil well based on logging gas chromatography data, as described in Embodiment 1.

[0099] The computer-readable storage medium stores non-transitory computer-readable instructions thereon. When the non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the methods of the foregoing embodiments are performed.

[0100] The aforementioned computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or portable hard drive), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

[0101] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for allocating initial production output of oil wells based on well logging gas chromatography data, characterized in that, It uses the water flooding data I obtained from the early oil trial and production to establish a standard interpretation and evaluation chart marked with the water content interval boundary line; and determines the water content interval of the single layer by using the water flooding data II of each single layer to be split into the position of falling into the standard interpretation and evaluation chart, and then splits the layer. The data related to the degree of flooding includes: the ratio of pterostilbene to n-heptadecane. The ratio of phytane to n-octadecane Light and heavy component ratio and 2. The method for allocating initial production output of oil wells based on well logging gas chromatography data according to claim 1, characterized in that, It includes the following steps performed sequentially: S1. Take the water flooding degree related data I corresponding to each water cut well layer from the well logging gas chromatography analysis results obtained in the early oil trial and production, and establish an interpretation and evaluation chart; The degree of flooding is classified according to the level of moisture content, and the moisture content range corresponding to different levels of flooding is determined. The boundary line of the moisture content range is marked in the interpretation and evaluation chart to obtain the standard interpretation and evaluation chart. S2. Take the flooding degree related data II for each single layer to be split into layers, and input them into the standard interpretation evaluation chart. Based on the two boundary lines where the flooding degree related data II falls, determine the water content range of each single layer. S3. The total liquid production of the layer to be split is divided using the KH coefficient method, and the liquid production of each single layer is calculated. S4. Given the water cut value of each layer, calculate the oil production and water production of each layer. Adjust the water cut value of each layer to other values ​​within its water cut range, calculate the corresponding oil production and water production of each layer until the sum of the production of each layer equals the corresponding total production, and output the oil production and water production of each layer.

3. The method for dividing the initial production output of oil wells based on well logging gas chromatography data according to claim 2, characterized in that, The flooding severity is classified into four levels: no flooding, low flooding, moderate flooding, high flooding, and extremely high flooding; the corresponding water content ranges are (0, 20%), [20%, 40%), [40%, 80%), [80%, 90%), and [90%, 100%), respectively.

4. The method for dividing the initial production output of an oil well based on well logging gas chromatography data according to claim 3, characterized in that, In step S3, the formula for calculating the liquid production of each monolayer is as follows: In the formula, Q i The yield of a single layer is divided into fractions, t; Q represents the total liquid production, in tons. K i The permeability of a certain monolayer, in μm 2 ; H i Let the thickness of a single reservoir layer be m; i represents the single-layer sequence number, and n represents the total number of layers in production.

5. A method for allocating initial production output of oil wells based on well logging gas chromatography data according to any one of claims 1-4, characterized in that, The output oil production and water production of a single layer satisfy the following conditions: f iMin ≤f i ≤f iMax ; Q 油i =Q i ×(1-f i ); Q 水i =Q i ×f i ; Q=Q1+Q2+…Q n ; In the formula, f i The water content of a single layer; f iMin The lower limit of moisture content for a given single layer; f iMax The upper limit of moisture content for a given single layer; Q 油i For a single layer of oil production; Q 水i The water production of a single layer.

6. An electronic device for a method of dividing the initial production output of an oil well based on well logging gas chromatography data, 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 method for splitting the initial production of oil wells based on logging gas chromatography data, as described in any one of claims 1-5.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that executes any one of claims 1-5, a method for splitting the initial production output of an oil well based on logging gas chromatography data.

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