Well logging interpretation method for rapidly determining flooding level

Abstract

The invention relates to a logging interpretation method for rapidly determining a flooding level, and belongs to the field of oil-gas exploration and development and petroleum engineering. Aiming at the problems of high cost and long consumed time of determining the flooding level of the existing old area oil field, the method provided by the invention comprises the following steps of: calculating the water saturation by adopting an Archie formula according to a conventional logging curve; drawing a daily production curve according to oil test and production test data to determine a reasonable water content; analyzing the relationship between the water content and the water saturation to fit a calculation formula; and determining the flooding level according to the water content. Meanwhile, the invention further provides software for quickly determining the flooding level. The method has the advantages of rapidness and low cost, and the oilfield development efficiency and economic benefits can be improved.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas exploration and development and petroleum engineering, and specifically is a well logging interpretation method for quickly determining water flooding levels. Background Art

[0002] Determination of the water flooding level of old oil fields is an important indicator for guiding the production plan of oil wells. Currently, the water flooded layer evaluation methods are mainly divided into two categories: one is the water flooded layer evaluation method based on the comparison of new and old wells based on electrical logging, and the other is the water flooded layer evaluation method based on various new logging technologies.

[0003] In the prior art, the evaluation method of water-flooded layers by comparing new and old wells based on electrical logging has the disadvantages of high cost and long time to determine the method, which usually requires complex experiments and analysis, involving a lot of manpower, material resources and time costs. Summary of the invention

[0004] The purpose of the present invention is to provide a well logging interpretation method and device for quickly determining the water flooding level, which can effectively solve the problems in the background technology.

[0005] The technical solution to achieve the above object is: a well logging interpretation method for quickly determining the flooding level, characterized in that it includes the following steps:

[0006] 1) Calculate the water saturation of old wells;

[0007] 2) Determine the reasonable water content of old wells;

[0008] 3) Calculate the water content of the new well; according to the relationship between the reasonable water content and water saturation of the old well, fit the calculation formula for calculating the water content using water saturation, and then substitute the water saturation of the new well into the calculation formula to calculate the water content of the new well;

[0009] 4) Determine the flooding level based on the water content of the new well.

[0010] Furthermore, the calculation formula of the water content and water saturation fitted in step 3) is:

[0011]

[0012] Wherein, FW is the reasonable moisture content, in %, SW is the water saturation, in %, and e is a natural constant.

[0013] Another object of the present invention is to provide a flooding level determination device, comprising:

[0014] The acquisition module is used to obtain conventional logging curves and oil test and production test data of old wells;

[0015] Water saturation calculation module, used to calculate water saturation based on conventional logging curves of old wells;

[0016] Reasonable water content determination module, used to obtain daily production curve according to oil test and production test data, and determine the reasonable water content of old wells according to the daily production curve;

[0017] The water content calculation module is used to fit the calculation formula for calculating the water content using the water saturation according to the relationship between the reasonable water content and water saturation of the old well, and then substitute the water saturation of the new well into the calculation formula to calculate the water content of the new well;

[0018] The flooding level determination module is used to determine the flooding level according to the water content.

[0019] A third object of the present invention is to provide a computer device, characterized in that it comprises a processor and a memory for storing processor-executable instructions, the processor is connected to the memory, and the steps of the method are implemented when the processor executes the instructions.

[0020] Furthermore, the computer device also includes a display connected to the processor.

[0021] The old well and the new well in the method of the present invention are located in the same reservoir.

[0022] The method of the present invention can be applied to various types of oil fields and has wide applicability.

[0023] The method of the present invention can be combined with existing well logging interpretation software to improve work efficiency.

[0024] The method of the present invention can provide accurate water flooding level information for oil field development, help optimize oil well production plans, and improve the recovery rate of the oil field.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) Cost reduction

[0027] The prior art has a high cost for determining the flooding level of old oil fields, but the present invention uses conventional logging curves and oil test and production test data, eliminating the need for complex and expensive experiments, thereby greatly reducing the cost of determining the flooding level.

[0028] (2) Shortened time

[0029] Traditional methods are time-consuming. The logging interpretation method for quickly determining the water flooding level of the present invention can determine the water flooding level in a relatively short time through a series of concise and efficient steps, including using the Archie formula to calculate water saturation, drawing daily production curves to determine a reasonable water cut, fitting calculation formulas, and determining the water flooding level based on the water cut, thereby gaining valuable time for oilfield development decisions.

[0030] (3) Improved accuracy

[0031] The present invention is based on scientific calculation methods and data analysis to comprehensively determine the flooding level from multiple perspectives. The accuracy of the basic data is guaranteed by calculating the water saturation through the Archie formula. The reasonable water content is determined in combination with the test oil and production data to better fit the actual production situation. The fitted calculation formula further improves the accuracy of the water content calculation, making the final determined flooding level more accurate and reliable, providing more precise guidance for oilfield development.

[0032] (4) Wide applicability

[0033] The method of the present invention can be applied to various types of oil fields, is not limited by factors such as oil field scale and geological conditions, has wide applicability, and can provide an effective flooding level determination solution for oil field development in different regions.

[0034] (5) Software-assisted efficiency improvement

[0035] The present invention also provides software for quickly determining flooding levels, which further improves work efficiency, facilitates operators to quickly and accurately determine flooding levels, and provides support for the informatization and intelligence of oil field development. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the process of the present invention;

[0037] Figure 2 is a system schematic diagram of the computer device of the present invention;

[0038] Figure 3 Schematic diagram of the device for determining flooding level;

[0039] Figure 4 The daily production curve of the old wells in S oil field

[0040] Figure 5 This is the relationship diagram between water content and water saturation. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical methods and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and drawings. The described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1 As shown, an embodiment of the present invention provides a well logging interpretation method for quickly determining the water flooding level, comprising the following steps:

[0043] S101, collect conventional logging curves and oil test and production test data of old wells;

[0044] S102, based on the conventional logging curve of the old well, the water saturation of the old well is calculated using the Archie formula;

[0045] S103, drawing a daily production curve of the old well based on the oil test and production test data, and determining a reasonable water content of the old well;

[0046] S104, analyze the relationship between the reasonable water content and water saturation of the old well, and fit the calculation formula:

[0047]

[0048] Among them, FW is the reasonable water content, the unit is %; SW is the water saturation, the unit is %, and e is the natural constant;

[0049] S105, substituting the water saturation of the new well into a calculation formula to calculate the water content of the new well;

[0050] S106, determining the flooding level according to the water content of the new well. The specific flooding level is shown in Table 1.

[0051] Flooding level classification standard

[0052]

[0053] Table 1

[0054] The following takes the D-group water-flooded reservoir of the S oil field in the Q depression of the S basin as an example to explain in detail the process of determining the water-flooding level by using the present invention.

[0055] (1) Collect conventional logging curves and test production data of old wells in the water-flooded reservoir of Group D in the S oilfield in the Q sag of the S basin.

[0056] (2) According to the conventional logging curve of the old well, the water saturation of the old well is calculated using the Archie formula, as shown in Table 2;

[0057] (3) Draw the daily production curve of the old well based on the test oil and production data (for example Figure 4 As shown in the figure, determine the reasonable water content of the old well. Table 2 is the statistical table of water saturation and reasonable water content of the water-flooded reservoir of Group D in the S oilfield in the Q Sag of the S Basin:

[0058]

[0059]

[0060] Table 2

[0061] (4) Analyze the relationship between the reasonable water content and water saturation of old wells and fit a calculation formula.

[0062] Based on the statistical data of water saturation and reasonable water content of old wells in the water-flooded reservoir of Group D in S Oilfield, Q Sag, S Basin, a relationship diagram between reasonable water content and water saturation of old wells was compiled ( Figure 5 The empirical relationship between the reasonable water content and water saturation of the old well is fitted as follows:

[0063]

[0064] Wherein, FW is the water content, unit is %, SW is the water saturation, unit is %, and e is a natural constant.

[0065] (5) Substitute the water saturation of the new well into the calculation formula (1) to calculate the water content of the new well.

[0066] The water saturation of the reservoir No. X in the newly drilled SX well in the S oil field is 28.7% according to the logging. According to formula (1), the water content of the reservoir is 25.6%.

[0067] (6) Determine the flooding level based on the water content of the new well.

[0068] The water content of the X-th reservoir of the D group of the SX well is 25.6%. According to the water flooding grade classification standard of the S oilfield in the Q depression of the S basin, the water flooding grade of this reservoir is determined to be low water flooding.

[0069] Based on the same inventive concept, a flooding level determination device is also provided in the embodiments of the present application, as described in the following embodiments. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable. Figure 3 is a structural block diagram of a device for determining a flooding level in an embodiment of the present application.

[0070] Acquisition module 1, used to obtain conventional logging curves and oil test and production test data of old wells;

[0071] Water saturation calculation module 2, used to calculate water saturation based on conventional well logging curves of old wells;

[0072] The reasonable water content determination module 3 is used to obtain the daily production curve according to the oil test and production test data, and determine the reasonable water content of the old well according to the daily production curve.

[0073] The water content calculation module 4 is used to fit a calculation formula for calculating the water content using the water saturation according to the relationship between the water content and the water saturation of the old well, and then substitute the water saturation of the new well into the calculation formula to calculate the water content of the new well;

[0074] The flooding level determination module 5 is used to determine the flooding level according to the water content of the new well.

[0075] like Figure 2 As shown, a computer device based on a flooding level determination method is also provided in an embodiment of the present application, including a processor 20, a display 10, and a memory 30 for storing processor executable instructions. The display 10, the processor 20, and the memory 30 are communicatively connected via a bus 50. The computer device stores computer program instructions, and when the computer program instructions are executed, the steps of the flooding level determination method described in the above embodiment are implemented.

Claims

1. A well logging interpretation method for quickly determining water flooding level, characterized in that: The steps include: 1) Calculate the water saturation of old wells; 2) Determine the reasonable water content of old wells; 3) Calculate the water content of the new well; according to the relationship between the reasonable water content and water saturation of the old well, fit the calculation formula for calculating the water content using water saturation, and then substitute the water saturation of the new well into the calculation formula to calculate the water content of the new well; 4) Determine the flooding level based on the water content of the new well.

2. A well logging interpretation method for quickly determining water flooding level according to claim 1, characterized in that: The calculation formula for the moisture content and water saturation fitted in step 3) is: Among them, FW is the reasonable water content, the unit is %; SW is the water saturation, the unit is %, and e is a natural constant.

3. A flooding level determination device, characterized in that: include: The acquisition module is used to obtain conventional logging curves and oil test and production test data of old wells; Water saturation calculation module, used to calculate water saturation based on conventional logging curves of old wells; Reasonable water content determination module, used to obtain daily production curve according to oil test and production test data, and determine the reasonable water content of old wells according to the daily production curve; The water content calculation module is used to fit the calculation formula for calculating the water content using the water saturation according to the relationship between the reasonable water content and water saturation of the old well, and then substitute the water saturation of the new well into the calculation formula to calculate the water content of the new well; The flooding level determination module is used to determine the flooding level according to the water content of the new well.

4. A computer device, characterized in that: The invention comprises a processor and a memory for storing processor executable instructions, the processor is connected to the memory, and the processor implements the steps of the method according to any one of claims 1 to 2 when executing the instructions.

5. A computer device according to claim 4, characterized in that: The computer device also includes a display connected to the processor.

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