Method and device for rapidly evaluating final exploitable gas quantity of shale oil and gas

Abstract

The invention discloses a method and a device for quickly evaluating the final exploitable gas quantity of shale oil and gas. The method comprises the steps that the average daily oil production of a target well is obtained, the target well is a shale oil production well, and the average daily oil production is the average daily oil production in the third month after the maximum daily oil production of the target well; according to the fracturing section parameters of the target well and the average value of the corresponding fracturing section parameters, a standardization coefficient is determined, the average daily oil production is standardized through the standardization coefficient, and the standard average daily oil production is obtained; according to the obtained standard average daily oil production, the final available oil production of the target well is predicted according to the first corresponding relation between the final available oil production and the standard average daily oil production. According to the method, rapid and accurate prediction of the final oil recovery gas quantity by using the oil and gas production data in the early production stage of the production well is realized, and technical support is provided for exploration deployment and development scheme adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration and development, and in particular to a method and device for quickly evaluating the final recoverable oil and gas volume of shale oil and gas. Background Art

[0002] Shale oil and gas refers to unconventional oil and gas found in shale formations, which can be industrially developed using volume fracturing technology. Shale oil and gas has become an important area of ​​global oil and gas exploration and development. Accurately predicting the final recoverable oil and gas volume of shale oil and gas production wells is of great significance for formulating exploration deployment and development plans. However, exploration and development practice has confirmed that due to geological and engineering factors, the oil and gas production of production wells decreases rapidly and there are many uncertainties. There are many existing technologies for predicting the final recoverable oil and gas volume, but they all require at least two years of oil and gas production of the production wells to more accurately predict the final recoverable oil and gas volume of the production wells.

[0003] The existing technologies for predicting the final recoverable oil and gas volume of shale oil and gas production wells mainly include the following: First, the analytical method, which obtains the effective permeability of the reservoir and fractures of the production well section, the effective half-length of the fracture, the fracture conductivity, the fracture control radius and other parameters, and uses the pressure recovery test or unstable production analysis method to obtain the relationship between pressure, production time and oil and gas production. Through the pressure regularization of the relationship between oil and gas production and material balance time, according to the production system, select the appropriate analytical equation for shale oil production wells to achieve the prediction of the final recoverable oil and gas volume. The second is the decline method, according to the actual oil and gas production decline law of the production well, select the appropriate oil and gas production prediction model to achieve the prediction of the final recoverable oil and gas volume. The decline method mainly includes the modified hyperbolic decline model, Duong model, harmonic decline model, logical growth model, exponential decline model, etc. The third is the numerical simulation method, which uses geological, well logging and three-dimensional seismic data to determine the lithology, physical properties, oil content and compressibility of the target layer, evaluate the properties of the reservoir, and establish a three-dimensional geological model of geostress, natural fractures, pore pressure, oil saturation and porosity. Based on the test data, a numerical model of shale oil adsorption / desorption, multiphase mass transfer, stress sensitivity and phase change that changes with pressure is established. According to the fracturing construction parameters, a hydraulic fracture expansion simulation is carried out. The simulated bottom hole casing pressure should be consistent with the actual bottom hole casing pressure of the fracturing construction to obtain the three-dimensional spatial distribution of the fracturing fractures, and a numerical simulation of the reservoir with the coupling of the fracturing network and the matrix is ​​carried out. According to the historical data of the production wells and the accuracy requirements of the research objectives, the fitting accuracy of the oil and gas production of the production wells is determined. Combined with the unstable production test results of the test wells and production wells, the historical fitting of the oil and gas production of the production wells is carried out to obtain the fitted numerical model. The fitted numerical model is used to formulate a production system, and the oil and gas production of the production wells and the final recoverable oil equivalent are predicted and calculated. Fourth, the analogy method is to select typical production wells representing the oil and gas production rules of production wells in the development area, and determine the analog wells in the development area where the target layer of the planned drilling (target well) has the same or similar geological conditions. The analog wells are determined to determine the reservoir thickness, hydrocarbon saturation, porosity, matrix permeability, fluid properties, degree of natural fracture development, radius length of fracturing fractures, number of fractures, crude oil components, crude oil viscosity and test pressure of the analog wells. The peak oil and gas production and decline rate of the analog wells are calculated, the decline exponential curve is drawn, the oil and gas production profile of the analog well is drawn, the target well location and the length of the production well section are determined, and the Monte Carlo simulation method is used to evaluate the oil and gas production of the target well and the probability distribution of the final recoverable oil equivalent, and the final recoverable oil equivalent is evaluated and determined. Summary of the invention

[0004] The inventors found that the existing methods for predicting the final recoverable oil and gas volume of shale oil and gas production wells have certain limitations. First, the analytical method requires obtaining a large amount of parameter data of the production well section, and at the same time, there must be pressure recovery test wells or unstable production data in order to use this method to predict the final recoverable oil and gas volume. However, the large number of parameters required by this technology have many uncertainties, and only a few wells have pressure recovery test wells or unstable production data. Therefore, the application conditions of this technology are harsh and the data is not easy to obtain. At the same time, the prediction accuracy of the final recoverable oil and gas volume is not high, and it is difficult to achieve accurate prediction of the final recoverable oil and gas volume. The second is the decreasing method, which is currently a common technology for predicting the final recoverable oil and gas volume. The accuracy of its prediction results increases with the increase of production time, but the accuracy of the prediction results in the early production of the production well is not high, and it is difficult to accurately predict the final recoverable oil and gas volume. Therefore, it is not suitable for predicting the final recoverable oil and gas volume in the early production stage. The third is the numerical simulation method, which is suitable for the development stage. Under the conditions of having a large amount of experimental analysis, geological, geophysical and production well data, and being able to establish a complete and accurate geological model, numerical fitting can be used to obtain a more reliable prediction result of the final recoverable oil and gas volume. Therefore, in the absence of complete development data, this technology cannot accurately predict the final recoverable oil and gas volume of production wells, nor is it suitable for the prediction of the final recoverable oil and gas volume in the early stage of production wells. The fourth is the analogy method, which requires the same or similar geological conditions as the analog wells, and the production wells in the analog area have oil and gas production data with a long production time. However, due to differences in engineering technology and geological conditions, the prediction results of this technology are not accurate. Therefore, it is impossible to use the initial oil and gas production data of production wells to accurately predict the final recoverable oil and gas volume.

[0005] It can be seen that the existing technologies have defects and shortcomings when predicting the final recoverable oil and gas volume in the early stage of production of production wells, and cannot achieve accurate prediction of the final recoverable oil and gas volume.

[0006] In order to at least partially solve the technical problems existing in the prior art, the inventors have made the present invention, and through a specific implementation method, provide a method and device for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, which can accurately predict the final recoverable oil and gas volume by using the initial oil and gas production data of the production wells.

[0007] In a first aspect, an embodiment of the present invention provides a method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, comprising:

[0008] Obtaining an average daily oil production of a target well, wherein the target well is a shale oil production well, and the average daily oil production is the average daily oil production of the target well in the third month after the maximum daily oil production;

[0009] Determine a normalization coefficient according to the fracturing stage parameters of the target well and the average values ​​of the corresponding fracturing stage parameters, and use the normalization coefficient to normalize the average daily oil production to obtain a standard average daily oil production;

[0010] According to the obtained standard average daily oil production, the final recoverable oil production of the target well is predicted by utilizing the first corresponding relationship between the final recoverable oil production and the standard average daily oil production.

[0011] In a second aspect, an embodiment of the present invention provides a device for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, comprising:

[0012] A daily production acquisition module, used to acquire the average daily oil production of a target well, wherein the target well is a shale oil production well, and the average daily oil production is the average daily oil production of the target well in the third month after the maximum daily oil production;

[0013] A standardization module, used to determine a standardization coefficient according to the fracturing stage parameters of the target well and the average values ​​of the corresponding fracturing stage parameters, and to standardize the average daily oil production using the standardization coefficient to obtain a standard average daily oil production;

[0014] The final recoverable oil prediction module is used to predict the final recoverable oil volume of the target well according to the obtained standard average daily oil production and by utilizing the first corresponding relationship between the final recoverable oil volume and the standard average daily oil production.

[0015] In a third aspect, an embodiment of the present invention provides a computer storage medium, in which computer executable instructions are stored. When the computer executable instructions are executed by a processor, the above-mentioned method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas is implemented.

[0016] In a fourth aspect, an embodiment of the present disclosure provides a server, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for rapidly evaluating the final recoverable oil and gas volume of shale oil and gas when executing the program.

[0017] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0018] (1) The method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas provided in the embodiment of the present invention proposes to use the average daily oil production in the third month after the standardized maximum daily oil production to predict the final recoverable oil volume, thereby overcoming the defects of the prior art that the oil and gas production of the production wells in the initial months is unstable and the prediction of the final recoverable oil and gas volume is inaccurate; the prediction efficiency is improved; the technical defects of the prior art decline method that requires oil and gas production data of a long production time to accurately predict the final recoverable oil and gas volume are overcome; at the same time, the technical defects of the analytical method that requires a large amount of parameter data of the production well section and pressure recovery test wells or unstable production data to use the analytical method to predict the final recoverable oil and gas volume are overcome; the technical defects of the numerical simulation method that requires the establishment of an accurate geological and reservoir model and a large amount of long-term oil and gas production data of the production wells are overcome to accurately predict the final recoverable oil and gas volume; the technical defects of the analog method that the accuracy of predicting the final recoverable oil and gas volume is not high under the condition that the geological conditions and parameters of non-coring wells are not very certain; therefore, the method solves the defects and deficiencies in the prior art and fills the technical gap in this field. This method is suitable for predicting the ultimate recoverable oil and gas volume of shale oil and gas, and is also suitable for predicting the ultimate recoverable oil and gas volume of unconventional oil and gas production wells such as tight oil, tight gas, and coalbed methane.

[0019] (2) The method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas provided in the embodiment of the present invention, when the production well is a shale oil and gas production well, also includes predicting the final recoverable gas volume by using the average daily gas production volume in the third month after the standardized maximum daily oil and gas production volume. Therefore, this method is applicable to shale oil production wells, and is also applicable to shale oil and gas production wells.

[0020] (3) The method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas provided in the embodiment of the present invention, based on the accurate prediction of the final recoverable oil volume and the final recoverable gas volume, realizes the conversion of the final recoverable oil equivalent through the conversion coefficient of unit gas volume equivalent to unit calorific value oil volume, thereby overcoming the defect of large error in oil equivalent conversion caused by different gas-oil ratios of production wells in the process of predicting the final recoverable oil equivalent in the prior art.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a flow chart of a method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas in Example 1 of the present invention;

[0025] Figure 2 This is a flow chart of a method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas in Example 2 of the present invention;

[0026] Figure 3 This is a flow chart of a method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas in Example 3 of the present invention;

[0027] Figure 4 It is a schematic diagram of the oil and gas production in the third month after the maximum daily oil and gas production of the production well is determined in the third embodiment of the present invention;

[0028] Figure 5 This is a relationship diagram between the average daily oil production and the final recoverable oil production of the production wells in the xx work area after the maximum daily oil and gas production in the third month after standardization in the third embodiment of the present invention;

[0029] Figure 6 This is a relationship diagram between the average daily gas production and the final recoverable gas production in the third month after the maximum daily oil and gas production of the production wells in the xx work area after standardization in the third embodiment of the present invention;

[0030] Figure 7 A graph showing the relative error relationship between the predicted final recoverable oil equivalent in Example 3 of the present invention and the final recoverable oil equivalent predicted by the decline method using different production times;

[0031] Figure 8 Schematic diagram of the structure of a device for quickly evaluating the final recoverable oil and gas volume of shale oil and gas in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0034] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0035] Embodiment 1

[0036] Embodiment 1 of the present invention provides a method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, which is applicable to shale oil production wells. Figure 1 As shown, the following steps are included:

[0037] Step S11: Obtain the average daily oil production of the target well.

[0038] The target well is a shale oil production well, and the average daily oil production is the average daily oil production in the third month after the maximum daily oil production of the target well.

[0039] Furthermore, the average daily oil production is the average daily oil production during the normal production time in the third month after the maximum daily oil production of the target well; the normal production time is the oil and gas production time under normal production conditions, and the time of shutting in the well or stopping production is not included.

[0040] Daily oil production is the volume of liquid hydrocarbons under normal temperature and pressure conditions, including the total volume of black oil, light oil and condensate oil. That is, the average daily oil production includes the total volume of average daily black oil, light oil and condensate oil.

[0041] The average daily oil production unit can be barrels / day, cubic meters / day, cubic feet / day, etc.

[0042] Step S12: determining a normalization coefficient according to the fracturing stage parameters of the target well and the corresponding average values ​​of the fracturing stage parameters, and using the normalization coefficient to normalize the average daily oil production to obtain a standard average daily oil production.

[0043] Fracturing stage parameters may include engineering parameters such as fracturing stage length, number of fracturing clusters, amount of proppant used per meter, and amount of fracturing fluid used per meter.

[0044] The length of the fracturing section is the length of the stem well section from the bottom of the first fracturing section to the top of the last fracturing section.

[0045] The number of fracturing clusters in a fracturing stage is the average number of fracturing clusters in each fracturing stage.

[0046] The amount of proppant used per meter is the average amount of proppant used per meter within the length of the fracturing section.

[0047] The amount of fracturing fluid used per meter is the average amount of fracturing fluid used per meter within the length of the fracturing section.

[0048] The normalization coefficient is determined according to the length of the fracturing section, the number of fracturing clusters, the amount of proppant used per meter, the amount of fracturing fluid used per meter and the average values ​​of the corresponding fracturing section parameters of the target well.

[0049] The corresponding average value of the fracturing stage parameters is the average value of the corresponding fracturing stage parameters of the production wells in the work area where the target well is located and / or in the neighboring areas of the work area.

[0050] If there are enough production wells in the work area where the target well is located, the statistical average value of the corresponding fracturing stage parameters of the production wells in the work area can be used; if there are not enough production wells in the work area where the target well is located, the data of production wells in the adjacent areas need to be included in the statistics.

[0051] In some embodiments, the normalization coefficient may be determined by the following formula (1):

[0052]

[0053] In formula (1), S is the standardized coefficient of the production well, L i is the length of the fracturing section of the production well, P i F is the proppant dosage per meter of the production well fracturing section, i is the amount of fracturing fluid used per meter of the fracturing section of the production well, C i is the number of fracturing clusters in the fracturing section of the production well, is the average length of the fracturing section, is the average support dose per meter, is the average amount of fracturing fluid used per meter, is the average number of fracturing clusters, n 1 、n 2 、n 3 and n 4 are the single factor nonlinear regression empirical coefficients between the corresponding fracturing stage parameters and the final recoverable oil and gas volume.

[0054] Specifically, 1The nonlinear regression empirical coefficients are obtained by using the single factor regression method based on the length of the production well fracturing section and the final recoverable oil and gas volume of the corresponding production well obtained from the developed shale oil and gas production areas in the work area where the target well is located and / or the adjacent area of ​​the work area; n 2 The nonlinear regression empirical coefficient is obtained by using the single factor regression method to obtain the proppant dosage per meter of the production well fracturing stage and the final recoverable oil and gas volume of the corresponding production well using the developed shale oil and gas production area in the work area where the target well is located and / or the adjacent area of ​​the work area; n 3 The nonlinear regression empirical coefficient is obtained by using the single factor regression method to obtain the volume of fracturing fluid used per meter of the fracturing section of the production well and the final recoverable oil and gas volume of the corresponding production well in the developed shale oil and gas production area in the work area where the target well is located and / or the adjacent area of ​​the work area; n 4 In order to use the number of fracturing clusters in the fracturing section of the production wells and the final recoverable oil and gas volume of the corresponding production wells obtained from the developed shale oil and gas production areas in the work area where the target well is located and / or the neighboring areas of the work area, the single factor regression method is used to obtain the nonlinear regression empirical coefficients.

[0055] Using the standardization coefficient obtained in the above process, the average daily oil production is standardized by the following formula (2) to obtain the standard average daily oil production:

[0056] IPO=IPO i ×S (2)

[0057] In formula (2), IPO is the standard average daily oil production of production wells, IPO i It is the average daily oil production of production wells before normalization.

[0058] Step S13: According to the obtained standard average daily oil production, the final recoverable oil production of the target well is predicted by using the first corresponding relationship between the final recoverable oil production and the standard average daily oil production.

[0059] The first correspondence is predetermined in the following manner:

[0060] According to the final recoverable oil volume of the sample well and the standard average daily oil production, the first corresponding relationship between the final recoverable oil volume and the standard average daily oil production is obtained by fitting. The sample well here is the developed shale oil and gas production area in the work area where the target well is located and / or the neighboring area of ​​the work area.

[0061] Specifically, the first corresponding relationship between the final recoverable oil volume and the standard average daily oil production is:

[0062] EUR oil =a×IPO (3)

[0063] In formula (3), EUR oilis the final recoverable oil volume of the production well, IPO is the standard average daily oil production of the production well, and a is the regression empirical coefficient between the standard average daily oil production and the final recoverable oil volume.

[0064] The method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas provided in Example 1 of the present invention proposes to use the average daily oil production in the third month after the standardized maximum daily oil production to predict the final recoverable oil volume, thereby overcoming the defects in the prior art that the oil and gas production of the production wells in the initial months is unstable and the prediction of the final recoverable oil and gas volume is inaccurate; the prediction efficiency is improved; the technical defect that the prior art decline method requires oil and gas production data with a long production time to accurately predict the final recoverable oil and gas volume is overcome; at the same time, the technical defect that the analytical method needs to obtain a large amount of parameter data of the production well section, and must have pressure recovery test wells or unstable production data before the analytical method can be used to predict the final recoverable oil and gas volume is overcome; the technical defect that the numerical simulation method needs to establish an accurate geological and reservoir model, and at the same time, a large amount of long-term production well oil and gas production data is required to accurately predict the final recoverable oil and gas volume is overcome; the technical defect that the analogy method predicts the final recoverable oil and gas volume with low accuracy under the condition that the geological conditions and parameters of non-coring wells are not very certain is overcome; therefore, the method solves the defects and deficiencies in the prior art and fills the technical gap in this field. This method is suitable for predicting the ultimate recoverable oil and gas volume of shale oil and gas, and is also suitable for predicting the ultimate recoverable oil and gas volume of unconventional oil and gas production wells such as tight oil, tight gas, and coalbed methane.

[0065] Embodiment 2

[0066] The second embodiment of the present invention provides a method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, which is applicable to shale oil and gas production wells. On the basis of predicting the final recoverable oil volume using the method in the first embodiment, see Figure 2 As shown, it also includes predicting the final recoverable gas volume through the following steps:

[0067] Step S21: Obtain the average daily gas production of the target well.

[0068] The average daily gas production is the average daily gas production in the third month after the maximum daily oil and gas production of the target well; further, the average daily gas production in the third month after the maximum daily oil and gas production is the average daily gas production in normal production days in the third month after the maximum daily oil and gas production of the production well.

[0069] The daily gas production includes the total volume of C1-C5 gas. That is, the average daily gas production includes the total volume of C1-C5 gas produced on average per day.

[0070] The average daily gas production can be expressed in barrels / day, cubic meters / day, cubic feet / day, etc.

[0071] Step S22: Standardize the average daily gas production using a standardization coefficient to obtain a standard average daily gas production.

[0072] The average daily gas production can be standardized by the following formula (4) to obtain the standard average daily gas production:

[0073] IPG=IPG×S (4)

[0074] In formula (4), IPG is the standard average daily gas production of the production well, and IPG is the average daily gas production of the production well before standardization.

[0075] Step S23: predicting the final recoverable gas volume of the target well according to the obtained standard average daily gas production volume and using the second corresponding relationship between the final recoverable gas volume and the standard average daily gas production volume.

[0076] Specifically, the second corresponding relationship between the final recoverable gas volume and the standard average daily gas production is:

[0077] EUR gas =b×IPG (5)

[0078] In formula (5), EUR gas is the final recoverable gas volume of the production well, IPO is the standard average daily gas production of the production well, and b is the regression empirical coefficient between the standard average daily gas production and the final recoverable gas volume.

[0079] To simplify the description, the average daily gas production, standard average daily gas production, average daily oil production, and standard average daily oil production in the embodiments of the present invention are all average values ​​during the normal production time of the third month after the maximum daily oil and gas production of the production well.

[0080] The method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas provided in Example 2 of the present invention, when the production well is a shale oil and gas production well, also includes predicting the final recoverable gas volume by using the average daily gas production in the third month after the standardized maximum daily oil and gas production. Therefore, this method is applicable to shale oil production wells and also to shale oil and gas production wells.

[0081] Embodiment 3

[0082] Embodiment 3 of the present invention provides a method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, which is applicable to shale oil and gas production wells, see Figure 3 As shown, the following steps are included:

[0083] Step S31: Obtain the average daily oil production and average daily gas production of the target well in the third month after the maximum daily oil and gas production.

[0084] See also Figure 4, which shows a schematic diagram of the average daily oil and gas production in the third month after the maximum daily oil and gas production of the production well is determined.

[0085] Step S32: Standardize the average daily oil production and the average daily gas production using a standardization coefficient to obtain a standard average daily oil production and a standard average daily gas production.

[0086] The normalization coefficient can be determined by the method in step S12 of the first embodiment. The average daily oil production is normalized using formula (2), and the average daily gas production is normalized using formula (4).

[0087] Step S33: predicting the final recoverable oil volume of the target well according to the obtained standard average daily oil production and using the first corresponding relationship between the final recoverable oil volume and the standard average daily oil production.

[0088] Figure 5 The figure shows the relationship between the average daily oil production in the third month after the maximum daily oil and gas production of the production wells and the final recoverable oil after the 501 shale oil and gas horizontal development wells with long production time in the xx work area are standardized to the production well section length, proppant dosage per meter, fracturing fluid volume per meter, and the average number of fracturing clusters in the fracturing section of the 501 horizontal production wells. It can be seen that there is a good linear relationship between the average daily oil production in the third month after the maximum daily oil and gas production after standardization and the final recoverable oil (see formula 6), and the positive correlation coefficient between the two is 0.9052. The average daily oil production in the third month after the maximum daily oil and gas production after standardization can well predict the final recoverable oil.

[0089] EUR oil =0.1044×IPO (6)

[0090] In formula (6): EUR oil is the final recoverable oil volume, ten thousand cubic meters; the empirical coefficient a is 0.1044; IPO is the average daily oil production in the third month after the standardized maximum daily oil and gas production of the production wells, cubic meters.

[0091] Step S34: predicting the final recoverable gas volume of the target well according to the obtained standard average daily gas production volume and using the second corresponding relationship between the final recoverable gas volume and the standard average daily gas production volume.

[0092] Demonstratively, Figure 6The figure shows the relationship between the average daily gas production in the third month after the maximum daily oil and gas production of the production wells and the final recoverable gas volume, using 501 shale oil and gas horizontal development wells with long production time in the xx work area. After the average daily gas production in the third month after the maximum daily oil and gas production of the production wells and the final recoverable gas volume are standardized to the production well section length, proppant dosage per meter, fracturing fluid volume per meter, and the average number of fracturing clusters in the fracturing section of the 501 horizontal production wells, the average daily gas production in the third month after the maximum daily oil and gas production after standardization and the final recoverable gas volume have a good linear relationship (see formula 7), and the positive correlation coefficient between the two is 0.8232. The average daily gas production in the third month after the maximum daily oil and gas production after standardization can well predict the final recoverable gas volume.

[0093] EUR gas =0.0861×IPG (7)

[0094] In formula (7): EUR gas is the final recoverable gas volume, 100 million cubic meters; the empirical coefficient b is 0.0861; IPG is the average daily gas production in the third month after the standardized maximum daily oil and gas production of the production wells, 10,000 cubic meters.

[0095] Step S35: Determine the final recoverable oil equivalent of the target well using the final recoverable oil volume and the final recoverable gas volume.

[0096] The final recoverable oil equivalent of the target well can be determined using the following formula (8):

[0097] EUR BoE =EUR oil +d×EUR gas (8)

[0098] In formula (8), EUR BOE is the final recoverable oil equivalent of the production well, EUR oil is the final recoverable oil volume of the production well, EUR gas is the final recoverable gas volume of the production well, and d is the conversion coefficient of unit gas volume equivalent to unit calorific value oil volume.

[0099] Preferably, the conversion coefficient d is determined by converting the calorific value of the natural gas in the production well into the equivalent volume of natural gas per unit volume of oil.

[0100] Figure 7The figure shows the relationship between the average relative error of the predicted final recoverable oil equivalent and the actual final recoverable oil equivalent produced by using the modified hyperbolic decline model, Duong model, harmonic decline model, logistic growth model, exponential decline model and the technology of the embodiment of the present invention using 501 shale oil and gas horizontal development wells with long production time in the xx work area, and using the oil and gas production data of different production times. It can be seen that when the production time of the production well is less than 2 years, the error of the final recoverable oil equivalent predicted by the technology of the embodiment of the present invention is the smallest. When the production time of the production well is 5 years, only the error of the final recoverable oil equivalent predicted by the modified hyperbolic decline model and the Duong model is smaller than the error of the technology of the embodiment of the present invention. Therefore, the technology of the embodiment of the present invention is an effective technology for predicting the final recoverable oil volume, the final recoverable gas volume, and the final recoverable oil equivalent in the early stage of shale oil and gas production wells, which can greatly improve the prediction accuracy of the final recoverable oil and gas volume in the early stage of production of production wells.

[0101] The method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas provided in Example 3 of the present invention, based on the accurate prediction of the final recoverable oil volume and the final recoverable gas volume, realizes the conversion of the final recoverable oil equivalent through the conversion coefficient of unit gas volume equivalent to unit calorific value oil volume, and overcomes the defect of large error in oil equivalent conversion caused by different gas-oil ratios of production wells in the process of predicting the final recoverable oil equivalent in the prior art.

[0102] Based on the inventive concept of the present invention, an embodiment of the present invention further provides a device for quickly evaluating the final recoverable oil and gas volume of shale oil and gas. The structure of the device is as follows: Figure 8 As shown, including:

[0103] A daily production acquisition module 81 is used to acquire the average daily oil production of a target well, wherein the target well is a shale oil production well, and the average daily oil production is the average daily oil production of the target well in the third month after the maximum daily oil production;

[0104] A standardization module 82 is used to determine a standardization coefficient according to the fracturing stage parameters of the target well and the corresponding fracturing stage parameter average values, and to standardize the average daily oil production using the standardization coefficient to obtain a standard average daily oil production;

[0105] The final recoverable oil prediction module 83 is used to predict the final recoverable oil volume of the target well according to the obtained standard average daily oil production and by using the first corresponding relationship between the final recoverable oil volume and the standard average daily oil production.

[0106] In some embodiments, the daily production acquisition module 81 is further used to acquire the average daily gas production of the target well, where the average daily gas production is the average daily gas production of the target well in the third month after the maximum daily oil and gas production;

[0107] The standardization module 82 is further used to standardize the average daily gas production using the standardization coefficient to obtain a standard average daily gas production;

[0108] The final recoverable gas volume prediction module 83 is further used to predict the final recoverable gas volume of the target well according to the obtained standard average daily gas production volume and by using the second corresponding relationship between the final recoverable gas volume and the standard average daily gas production volume.

[0109] In some embodiments, the above device further includes a final recoverable oil equivalent conversion module 84, which is used to:

[0110] The final recoverable oil equivalent of the target well is determined using the following formula:

[0111] EUR BOE =EUR oil +d×EUR gas

[0112] Among them, EUR BOE is the final recoverable oil equivalent of the production well, EUR oil is the final recoverable oil volume of the production well, EUR gas is the final recoverable gas volume of the production well, and d is the conversion coefficient of unit gas volume equivalent to unit calorific value oil volume.

[0113] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0114] Based on the inventive concept of the present invention, an embodiment of the present invention further provides a computer storage medium, in which computer executable instructions are stored. When the computer executable instructions are executed by a processor, the above-mentioned method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas is implemented.

[0115] Based on the inventive concept of the present invention, an embodiment of the present invention also provides a server, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the above-mentioned method for rapid evaluation of the final recoverable oil and gas volume of shale oil and gas is implemented.

[0116] Unless otherwise specifically stated, terms such as processing, computing, calculating, determining, displaying, etc. may refer to the actions and / or processes of one or more processing or computing systems, or similar devices, which operate and convert data represented as physical (e.g., electronic) quantities within registers or memories of a processing system into other data similarly represented as physical quantities within memories, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0117] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0118] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that an embodiment of the claimed subject matter requires more features than those set forth in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0119] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0120] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0121] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0122] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments can be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to represent "non-exclusive or". The terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

Claims

1. A method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, characterized in that: include: Obtaining an average daily oil production of a target well, wherein the target well is a shale oil production well, and the average daily oil production is the average daily oil production of the target well in the third month after the maximum daily oil production; Determine a normalization coefficient according to the fracturing stage parameters of the target well and the average values ​​of the corresponding fracturing stage parameters, and use the normalization coefficient to normalize the average daily oil production to obtain a standard average daily oil production; According to the obtained standard average daily oil production, the final recoverable oil production of the target well is predicted by utilizing the first corresponding relationship between the final recoverable oil production and the standard average daily oil production.

2. The method according to claim 1, characterized in that: The first corresponding relationship is predetermined by: According to the final recoverable oil volume of the sample wells and the standard average daily oil production, the first corresponding relationship between the final recoverable oil volume and the standard average daily oil production is obtained by fitting.

3. The method according to claim 2, characterized in that The first corresponding relationship is: EUR oil =a×IPO (1) In formula (1), EUR oil is the final recoverable oil volume of the production well, IPO is the standard average daily oil production of the production well, and a is the regression empirical coefficient between the standard average daily oil production and the final recoverable oil volume.

4. The method according to claim 1, characterized in that The step of determining the normalization coefficient according to the fracturing stage parameters of the target well and the corresponding fracturing stage parameter averages includes: A normalization coefficient is determined based on the length of the fracturing section, the number of fracturing clusters, the amount of proppant used per meter, the amount of fracturing fluid used per meter and the corresponding average values ​​of fracturing section parameters of the target well. The corresponding average value of fracturing section parameters is the average value of corresponding fracturing section parameters of production wells in the work area where the target well is located and / or in the neighboring area of ​​the work area.

5. The method according to claim 4, characterized in that Determining the normalization coefficient according to the fracturing stage parameters of the target well and the corresponding average values ​​of the fracturing stage parameters includes determining the normalization coefficient by the following formula: In formula (2), S is the standardized coefficient of the production well, L i is the length of the fracturing section of the production well, P i F is the proppant dosage per meter of the production well fracturing section, i is the amount of fracturing fluid used per meter of the fracturing section of the production well, C i is the number of fracturing clusters in the fracturing section of the production well, is the average length of the fracturing section, is the average support dose per meter, is the average amount of fracturing fluid used per meter, is the average number of fracturing clusters, and n1, n2, n3 and n4 are the single factor nonlinear regression empirical coefficients between the corresponding fracturing stage parameters and the final recoverable oil and gas volume.

6. The method according to claim 5, characterized in that The step of using the standardization coefficient to standardize the average daily oil production to obtain a standard average daily oil production includes: The average daily oil production is standardized by the following formula (3) using the standardization coefficient to obtain the standard average daily oil production: IPO=IPO i ×S (3) In formula (3), iPO is the standard average daily oil production of the production well, IPO i It is the average daily oil production of production wells before normalization.

7. The method according to claim 1, characterized in that Also includes: Obtaining the average daily gas production of the target well, wherein the average daily gas production is the average daily gas production of the target well in the third month after the maximum daily oil and gas production; The average daily gas production is standardized by using the standardization coefficient to obtain a standard average daily gas production; According to the obtained standard average daily gas production, the final recoverable gas volume of the target well is predicted by utilizing the second corresponding relationship between the final recoverable gas volume and the standard average daily gas production.

8. The method according to claim 7, characterized in that Also includes: The final recoverable oil equivalent of the target well is determined using the following formula (4): EUR BOE =EUR oil +d×EUR gas (4) In formula (4), EUR BOE is the final recoverable oil equivalent of the production well, EUR oil is the final recoverable oil volume of the production well, EUR gas is the final recoverable gas volume of the production well, and d is the conversion coefficient of unit gas volume equivalent to unit calorific value oil volume.

9. The method according to claim 1, characterized in that: The average daily oil production includes the sum of the average daily volumes of black oil, light oil and condensate; The average daily gas production includes the average daily total volume of C1-C5 gases.

10. A device for quickly evaluating the final recoverable oil and gas volume of shale oil and gas, characterized in that: The device comprises: A daily production acquisition module, used to acquire the average daily oil production of a target well, wherein the target well is a shale oil production well, and the average daily oil production is the average daily oil production of the target well in the third month after the maximum daily oil production; A standardization module, used to determine a standardization coefficient according to the fracturing stage parameters of the target well and the average values ​​of the corresponding fracturing stage parameters, and to standardize the average daily oil production using the standardization coefficient to obtain a standard average daily oil production; The final recoverable oil prediction module is used to predict the final recoverable oil volume of the target well according to the obtained standard average daily oil production and by utilizing the first corresponding relationship between the final recoverable oil volume and the standard average daily oil production.

11. A computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, and when the computer executable instructions are executed by the processor, the method for quickly evaluating the final recoverable oil and gas volume of shale oil and gas described in any one of claims 1 to 9 is implemented.

12. A server, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for rapidly evaluating the final recoverable oil and gas volume of shale oil and gas as claimed in any one of claims 1 to 9 is implemented.

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