A shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method and device

Abstract

The application discloses a shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method and device. The method comprises the following steps: obtaining 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 third month after the maximum daily oil production of the target well; determining a standardization coefficient according to the fracturing section parameters of the target well and the corresponding fracturing section parameter average value, and standardizing the average daily oil production by using the standardization coefficient to obtain a standard average daily oil production; and predicting the ultimate recoverable oil volume of the target well by using a first corresponding relationship between the ultimate recoverable oil volume and the standard average daily oil production. The method realizes rapid and accurate prediction of the ultimate recoverable oil and gas volume by using oil and gas production data in the initial production stage of the production well, and provides technical support for exploration deployment and development plan adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploration and development, and particularly relates to a shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method and device. BACKGROUND

[0002] Shale oil and gas refers to unconventional oil and gas existing in shale series, and can be realized industrialized development by volume fracturing technology. Shale oil and gas has become an important field of global oil and gas exploration and development, and accurate prediction of the ultimate recoverable oil and gas volume of a shale oil and gas production well is of great significance to the formulation of exploration deployment and development plan. However, exploration and development practice has proved that, due to the influence of geological and engineering factors, the oil and gas production of the production well decreases rapidly, and there are many uncertain factors. Many existing ultimate recoverable oil and gas volume prediction technologies need at least two years of oil and gas production of the production well to more accurately predict the ultimate recoverable oil and gas volume of the production well.

[0003] The existing prediction technologies for the ultimate recoverable oil and gas of shale oil and gas production wells mainly include the following: 1. Analytical method, the effective permeability of the reservoir and fracture, the effective half length of the fracture, the fracture conductivity, the fracture control radius and other parameters of the production well section are obtained, the pressure recovery test or unstable production analysis method is used to obtain the relationship between pressure, production time and oil and gas production, the pressure is normalized, the oil and gas production is related to the time balance, according to the production system, the appropriate shale oil production well analysis equation is selected, and the ultimate recoverable oil and gas is predicted. 2. Decline method, according to the actual oil and gas production decline law of the production well, the suitable oil and gas production prediction model is selected, the ultimate recoverable oil and gas is predicted, and the decline method includes the modified hyperbolic decline model, Duong model, harmonic decline model, logical growth model, exponential decline model and the like. 3. Numerical simulation method, the lithology, physical property, oil content, compressibility of the target layer are determined by using geological, logging and three-dimensional seismic data, the reservoir properties are evaluated, the three-dimensional geological model of ground stress, natural fracture, pore pressure, oil saturation and porosity is established, the shale oil adsorption / desorption, multiphase mass transfer, stress sensitivity, phase change numerical model varying with pressure is established according to the test data, the hydraulic fracture propagation simulation is carried out according to the fracturing construction parameters, the bottom hole casing pressure is consistent with the actual bottom hole casing pressure of the fracturing construction, the three-dimensional spatial distribution of the fracturing fracture is obtained, the numerical simulation of the oil reservoir coupled with the fracturing fracture network and the matrix is carried out, the fitting accuracy of the oil and gas production of the production well is determined according to the production well historical data and the research target accuracy requirement, the oil and gas production of the production well is carried out according to the test results of the test well and the unstable production of the production well, the numerical model after fitting is obtained, the production system is formulated, the oil and gas production and the ultimate recoverable oil equivalent of the production well are predicted and calculated. 4. Analog method, in the development area with the same or similar geological conditions in the target well (target well), the typical production well representing the production law of the production well in the development area is selected for comparison, the analog well is determined, the reservoir thickness, hydrocarbon saturation, porosity, matrix permeability, fluid property, natural fracture development degree, fracturing fracture radius length, fracture number, crude oil composition, crude oil viscosity and test pressure of the analog well are determined, the peak oil and gas production of the analog well, the decline rate is calculated, the decline index curve is drawn, the oil and gas production profile of the analog well is drawn, the target well position and the production well section length are determined, the Monte Carlo simulation method is used to evaluate the probability distribution of the oil and gas production and the ultimate recoverable oil equivalent of the target well, and the ultimate recoverable oil equivalent is determined. SUMMARY

[0004] The inventors find that the existing shale oil and gas production well ultimate recoverable oil and gas reserves prediction methods have certain limitations. One is the analytical method, which needs to obtain a large number of parameter data of the production well section, and must have pressure recovery testing or unstable production data, so as to predict the ultimate recoverable oil and gas reserves by using the method. However, the large number of parameters required by the technology have many uncertainties, and only a small number of wells have pressure recovery testing or unstable production data. Therefore, the technology has harsh application conditions, and the data is not easy to obtain. At the same time, the prediction accuracy of the ultimate recoverable oil and gas reserves is not high, and it is difficult to accurately predict the ultimate recoverable oil and gas reserves. Two is the decline method, which is the commonly used technology for predicting the ultimate recoverable oil and gas reserves. The prediction accuracy of the result increases with the increase of the production time, but the prediction accuracy of the result is not high in the early production of the production well, and it is difficult to accurately predict the ultimate recoverable oil and gas reserves. Therefore, it is not suitable for predicting the ultimate recoverable oil and gas reserves in the early production of the production well. Three is the numerical simulation method, which is suitable for the development stage. A large number of experimental analysis, geology, geophysics and production well data can be obtained, and a complete and accurate geological model can be established. Only by numerical fitting can a more reliable prediction result of the ultimate recoverable oil and gas reserves be obtained. Therefore, in the absence of complete development data, the technology cannot accurately predict the ultimate recoverable oil and gas reserves of the production well, and is not suitable for predicting the ultimate recoverable oil and gas reserves in the early production of the production well. Four is the analogy method, which needs to have the same or similar geological conditions as the analogy well, and the production well in the analogy area has a long production time of oil and gas production data. However, due to the difference in engineering technology and geological conditions, the prediction accuracy of the result is not high. Therefore, it is impossible to accurately predict the ultimate recoverable oil and gas reserves by using the oil and gas production data in the early production of the production well.

[0005] It can be seen that the existing technology has defects and deficiencies in predicting the ultimate recoverable oil and gas reserves of the production well in the early production, and cannot accurately predict the ultimate recoverable oil and gas reserves.

[0006] In order to at least partially solve the technical problems existing in the prior art, the inventors make the present application, and provide a shale oil and gas ultimate recoverable oil and gas reserves rapid evaluation method and device by specific embodiments, which realizes accurate prediction of the ultimate recoverable oil and gas reserves by using the oil and gas production data in the early production of the production well.

[0007] In a first aspect, the embodiments of the present application provide a shale oil and gas ultimate recoverable oil and gas reserves rapid evaluation method, which comprises:

[0008] The average daily oil production of the 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 of the third month after the maximum daily oil production of the target well;

[0009] According to the fracturing section parameters of the target well and average values of corresponding fracturing section parameters, a standardization coefficient is determined, the average daily oil production is standardized by using the standardization coefficient, and a standard average daily oil production is obtained;

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

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

[0012] A daily production obtaining module is configured to obtain an average daily oil production of a target well, the target well being a shale oil production well, and the average daily oil production being an average daily oil production of the target well in the third month after a maximum daily oil production of the target well;

[0013] A standardization module is configured to determine a standardization coefficient according to fracturing section parameters of the target well and average values of corresponding fracturing section parameters, standardize the average daily oil production by using the standardization coefficient, and obtain a standard average daily oil production.

[0014] A final recoverable volume predicting module is configured to predict a final recoverable oil volume of the target well according to the obtained standard average daily oil production and by using a first correspondence relationship between the final recoverable oil volume and the standard average daily oil production.

[0015] In a third aspect, an embodiment of the present application provides a computer storage medium, which stores computer executable instructions, and the computer executable instructions are executed by a processor to implement the above-mentioned method for quickly evaluating a final recoverable oil and gas volume of shale oil and gas.

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

[0017] The above-mentioned technical solutions provided by the embodiments of the present application have at least the following beneficial effects:

[0018] (1) The shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method provided by the embodiment of the present application uses the average daily oil production of the third month after the standardized maximum daily oil production to predict the ultimate recoverable oil volume, overcomes the defects in the prior art that the oil and gas production of the production well is unstable in the initial months, and the ultimate recoverable oil and gas volume is not accurately predicted; improves the prediction efficiency; overcomes the technical defects in the prior art that the decline method needs a long production time of oil and gas production data to accurately predict the ultimate recoverable oil and gas volume; overcomes the technical defects in the prior art that the analytical method needs to obtain a large amount of parameter data of the production well section and must have pressure recovery testing or unstable production data to predict the ultimate recoverable oil and gas volume by using the analytical method; overcomes the technical defects in the prior art that the numerical simulation method needs to establish an accurate geological and reservoir model, and also needs a large amount of long-time production well oil and gas production data to accurately predict the ultimate recoverable oil and gas volume; overcomes the technical defects that the analogy method has low precision in predicting the ultimate recoverable oil and gas volume under the condition that the geological condition parameters of the non-coring well are not certain; therefore, the method solves the defects and deficiencies in the prior art, fills the technical gap in the field, and 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 shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method provided by the embodiment of the present application, in the case of a shale oil and gas production well, also includes using the average daily gas production of the third month after the standardized maximum daily oil and gas production to predict the ultimate recoverable gas volume, so the method is suitable for shale oil production wells and shale oil and gas production wells.

[0020] (3) The shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method provided by the embodiment of the present application, on the basis of accurately predicting the ultimate recoverable oil volume and the ultimate recoverable gas volume, realizes the conversion of the ultimate recoverable oil equivalent by using the conversion factor that a unit of gas volume is equivalent to a unit of oil volume, and overcomes the defects in the prior art that there is a large error in the conversion of the oil equivalent during the prediction of the ultimate recoverable oil equivalent due to different gas-oil ratios of the production well.

[0021] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and the accompanying drawings.

[0022] The technical solutions of the present application will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of the specification. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0024] Figure 1 Flow chart of the method for rapidly evaluating the ultimate recoverable oil and gas volume in shale oil and gas in the first embodiment of the present application;

[0025] Figure 2 Flow chart of the method for rapidly evaluating the ultimate recoverable oil and gas volume in shale oil and gas in the second embodiment of the present application;

[0026] Figure 3 Flow chart of the method for rapidly evaluating the ultimate recoverable oil and gas volume in shale oil and gas in the third embodiment of the present application;

[0027] Figure 4 Diagram of the oil and gas production in the third month after determining the maximum daily oil and gas production of the production well in the third embodiment of the present application;

[0028] Figure 5 Diagram of the relationship between the average daily oil production and the ultimate recoverable oil volume in the third month after standardizing the maximum daily oil and gas production of the production well in the xx work area in the third embodiment of the present application;

[0029] Figure 6 Diagram of the relationship between the average daily gas production and the ultimate recoverable gas volume in the third month after standardizing the maximum daily oil and gas production of the production well in the xx work area in the third embodiment of the present application;

[0030] Figure 7 Diagram of the relationship between the predicted ultimate recoverable oil equivalent and the relative error of the ultimate recoverable oil equivalent predicted by the decline method using different production times in the third embodiment of the present application;

[0031] Figure 8 Structural diagram of the device for rapidly evaluating the ultimate recoverable oil and gas volume in shale oil and gas in the embodiment of the present application. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0033] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Additionally, for a range of values of, for example, the upper limit and lower limit of the range are included in the range. Each intermediate value of the stated range and any other stated or intervening value of the stated range is also encompassed within the application. The upper and lower limits of these smaller ranges can independently be included or excluded in the range.

[0034] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application. All documents mentioned herein are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict, the content of the present specification will control.

[0035] Embodiment one

[0036] Embodiment one of the present application provides a shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method, which is suitable for shale oil production wells, and the flow chart thereof is shown in Figure 1 The method comprises the following steps:

[0037] Step S11: obtaining 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] Further, the average daily oil production is the average value of the daily oil production in 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 state, and the shut-in or shutdown time is not included.

[0040] The daily oil production is the volume of liquid hydrocarbon 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 unit of average daily oil production can be barrel / day or cubic meter / day or cubic foot / day, etc.

[0042] Step S12: determining the standardization coefficient according to the fracturing section parameters of the target well and the average value of the corresponding fracturing section parameters, and standardizing the average daily oil production by using the standardization coefficient to obtain the standard average daily oil production.

[0043] The fracturing section parameters can include engineering parameters such as fracturing section length, fracturing cluster number, support agent amount used per meter, and fracturing fluid amount used per meter.

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

[0045] The fracturing cluster number of the fracturing section is the average fracturing cluster number of each fracturing section.

[0046] The support agent amount used per meter is the average support agent amount used per meter in the range of the fracturing section length.

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

[0048] The standardization coefficient is determined according to the fracturing section length, fracturing cluster number, support agent amount used per meter, and fracturing fluid amount used per meter of the target well and the corresponding average values of the fracturing section parameters.

[0049] The corresponding average values of the fracturing section parameters are the average values of the corresponding fracturing section parameters of the production wells in the work area and / or adjacent areas of the work area where the target well is located.

[0050] If there are enough production wells in the work area where the target well is located, the corresponding fracturing section parameter statistical average values 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 production well data in the adjacent areas need to be taken into account.

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

[0052] (1)

[0053] In formula (1): S is the standardization coefficient of the production well, L i is the fracturing section length of the production well, P i is the support agent amount used per meter of the fracturing section of the production well, F i is the fracturing fluid amount used per meter of the fracturing section of the production well, C i is the fracturing cluster number of the fracturing section of the production well, is the average value of the fracturing section length, is the average value of the support agent amount used per meter, is the average value of the fracturing fluid amount used per meter, is the average value of the fracturing cluster number, n 1、 n 2、 n 3 and n4 is a single-factor nonlinear regression empirical coefficient between the corresponding fracturing section parameters and the ultimate recoverable oil and gas volume.

[0054] Specifically, n 1 is a nonlinear regression empirical coefficient obtained by using the fracturing section length of the production well and the ultimate recoverable oil and gas volume of the corresponding production well in the developed shale oil and gas production area in the work area and / or adjacent area of the work area of the target well by using a single-factor regression method; n 2 is a nonlinear regression empirical coefficient obtained by using the amount of proppant per meter of the fracturing section of the production well and the ultimate recoverable oil and gas volume of the corresponding production well in the developed shale oil and gas production area in the work area and / or adjacent area of the work area of the target well by using a single-factor regression method; n 3 is a nonlinear regression empirical coefficient obtained by using the amount of fracturing fluid per meter of the fracturing section of the production well and the ultimate recoverable oil and gas volume of the corresponding production well in the developed shale oil and gas production area in the work area and / or adjacent area of the work area of the target well by using a single-factor regression method; n 4 is a nonlinear regression empirical coefficient obtained by using the number of fracturing clusters of the fracturing section of the production well and the ultimate recoverable oil and gas volume of the corresponding production well in the developed shale oil and gas production area in the work area and / or adjacent area of the work area of the target well by using a single-factor regression method.

[0055] The standardized coefficient obtained by the above process is used to standardize the average daily oil production by the following formula (2) to obtain the standard average daily oil production:

[0056] (2)

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

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

[0059] The first corresponding relationship is determined in advance by the following method:

[0060] The first corresponding relationship between the ultimate recoverable oil volume and the standard average daily oil production is obtained by fitting according to the ultimate recoverable oil volume and the standard average daily oil production of the sample well. The sample well is the developed shale oil and gas production area in the work area and / or adjacent area of the work area of the target well.

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

[0062] (3)

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

[0064] The rapid evaluation method for the final recoverable oil and gas volume of shale oil and gas provided in Embodiment 1 of this invention proposes to predict the final recoverable oil and gas volume using the average daily oil production of the third month after the standardized maximum daily oil production. This overcomes the shortcomings of existing technologies where oil and gas production is unstable in the first few months of production wells, leading to inaccurate predictions of the final recoverable oil and gas volume. It improves prediction efficiency and overcomes the technical deficiency of existing technologies, such as the decline method, which requires a long production period of oil and gas production data to accurately predict the final recoverable oil and gas volume. It also overcomes the technical deficiency of analytical methods, which require a large amount of parameter data for the production well section and pressure recovery testing or unstable production data to predict the final recoverable oil and gas volume. Furthermore, it overcomes the technical deficiency of numerical simulation methods, which require the establishment of accurate geological and reservoir models and a large amount of long-term production well oil and gas production data to accurately predict the final recoverable oil and gas volume. Finally, it overcomes the technical deficiency of the analogy method in predicting the final recoverable oil and gas volume when geological conditions and parameters of non-core wells are uncertain. Therefore, this method solves the defects and deficiencies of existing technologies and fills a technical gap in this field. This method is applicable to the prediction of the final recoverable oil and gas volume of shale oil and gas, and is also applicable to the prediction of the final recoverable oil and gas volume of unconventional oil and gas production wells such as tight oil, tight gas, and coalbed methane.

[0065] Example 2

[0066] Embodiment 2 of this invention provides a rapid evaluation method for the ultimate recoverable oil and gas volume of shale oil and gas, applicable to shale oil and gas production wells. Based on the method for predicting the ultimate recoverable oil volume described in Embodiment 1 above, see [link to Embodiment 2]. 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 of the target well in the third month following the maximum daily oil and gas production; further, the average daily gas production in the third month following the maximum daily oil and gas production is the average daily gas production during the normal production days in the third month following the maximum daily oil and gas production of the production well.

[0069] Daily gas production includes the total volume of C1-C5 gases. That is, average daily gas production includes the average daily total volume of C1-C5 gases.

[0070] The average daily gas production unit can be barrel / day or cubic meter / day or cubic foot / day, etc.

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

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

[0073] (4)

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

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

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

[0077] (5)

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

[0079] In order to simplify the description, the average daily gas production, the standard average daily gas production, the average daily oil production and the standard average daily oil production in the embodiment of the present application are all the average values in the normal production time of the third month after the maximum daily oil and gas production of the production well.

[0080] The shale oil and gas ultimate recoverable oil and gas production rapid evaluation method provided by the second embodiment of the present application further comprises predicting the ultimate recoverable gas production by using the average daily gas production of the third month after the standardized maximum daily oil and gas production in the case of the production well being a shale oil and gas production well, so that the method is applicable to shale oil production wells and shale oil and gas production wells.

[0081] Embodiment three

[0082] The shale oil and gas ultimate recoverable oil and gas production rapid evaluation method provided by the third embodiment of the present application is applicable to shale oil and gas production wells, and refers to FIG. 1, and comprises the following steps: Figure 3

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

[0084] Referring to Figure 4 As shown in FIG. 6, a schematic diagram for determining the average daily oil and gas production of the target well in the third month after the maximum daily oil and gas production of the production well is shown.

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

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

[0087] Step S33: According to the obtained standardized average daily oil production, the ultimate recoverable oil of the target well is predicted by using the first correspondence between the ultimate recoverable oil and the standardized average daily oil production.

[0088] Figure 5 As shown in FIG. 7, the average daily oil production of the target well in the third month after the maximum daily oil and gas production of the production well is standardized to the average value of the length of the production well section, the amount of proppant used per meter, the amount of fracturing fluid used per meter, and the number of fracturing clusters of the fracturing section of the 501 shale oil and gas horizontal development wells in the xx work area with long production time, and the relationship between the average daily oil production of the target well in the third month after the maximum daily oil and gas production of the production well and the ultimate recoverable oil is shown. It can be seen that there is a good linear relationship between the average daily oil production of the target well in the third month after the maximum daily oil and gas production of the production well and the ultimate recoverable oil after standardization (see formula 6), and the positive correlation coefficient between the two is 0.9052. The ultimate recoverable oil can be well predicted by the average daily oil production of the target well in the third month after the maximum daily oil and gas production of the production well after standardization.

[0089] (6)

[0090] In formula (6), is the ultimate recoverable oil, 104m3; empirical coefficient a is 0.1044; is the average daily oil production of the target well in the third month after the maximum daily oil and gas production of the production well, m3.

[0091] Step S34: According to the obtained standardized average daily gas production, the ultimate recoverable gas of the target well is predicted by using the second correspondence between the ultimate recoverable gas and the standardized average daily gas production.

[0092] Exemplarily, Figure 6The relationship between the average daily gas production in the third month after the maximum daily oil and gas production and the ultimate recoverable gas reserves is shown in the graph after the production well section length, the amount of proppant used per meter, the amount of fracturing fluid used per meter, and the average number of fracturing clusters of the fracturing section of the 501 horizontal development wells in the xx work area with long production time are standardized to the 501 horizontal production wells. It can be seen that there is a good linear relationship between the average daily gas production in the third month after the maximum daily oil and gas production and the ultimate recoverable gas reserves after standardization (see formula 7), and the positive correlation coefficient of the two is 0.8232. The average daily gas production in the third month after the maximum daily oil and gas production can be used to predict the ultimate recoverable gas reserves after standardization.

[0093] (7)

[0094] In formula (7), is the ultimate recoverable gas reserves, 100 million cubic meters; the empirical coefficient b is 0.0861; is the average daily gas production in the third month after the maximum daily oil and gas production of the production well, 10,000 cubic meters.

[0095] Step S35: Determine the ultimate oil equivalent of the target well using the ultimate oil reserves and the ultimate gas reserves.

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

[0097] (8)

[0098] In formula (8), is the ultimate oil equivalent of the production well, is the ultimate oil reserves of the production well, is the ultimate gas reserves of the production well, is the conversion factor of unit gas volume corresponding to unit oil volume.

[0099] Preferably, the conversion factor is determined according to the equivalent natural gas volume of the unit volume of oil converted from the natural gas heat value of the production well .

[0100] Figure 7This paper illustrates the average relative error between the predicted final recoverable oil equivalent (RPE) and the actual final recoverable oil equivalent (RPE) from 501 shale oil and gas horizontal development wells with long production times in the xx work area. The predictions were made using modified hyperbolic decline models, the Duong model, harmonic decline models, logistic growth models, exponential decline models, and the technology of this invention. It is evident that when the production time of the wells is less than 2 years, the error in the predicted RPE from this invention is the smallest. When the production time of the wells is 5 years, only the modified hyperbolic decline model and the Duong model show smaller errors in the predicted RPE than the technology of this invention. Therefore, the technology of this invention is an effective technique for predicting the final recoverable oil, gas, and oil equivalent in the early stages of shale oil and gas production wells, significantly improving the accuracy of RPE prediction in the initial production phase.

[0101] The rapid evaluation method for the final recoverable oil and gas volume of shale oil and gas provided in Embodiment 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 by using the conversion coefficient of unit gas volume to unit calorific value oil volume. This overcomes the defect of the existing technology in predicting the final recoverable oil equivalent, which has a large error in the oil equivalent conversion caused by the different gas-oil ratio of production wells.

[0102] Based on the inventive concept of this invention, embodiments of this invention also provide a rapid evaluation device for the ultimate recoverable oil and gas volume of shale oil and gas, the structure of which is as follows: Figure 8 As shown, it includes:

[0103] Daily production acquisition module 81 is used to acquire the average daily oil production of the 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] The standardization module 82 is used to determine the standardization coefficient based on the fracturing section parameters of the target well and the corresponding average values ​​of the fracturing section parameters, and to standardize the average daily oil production using the standardization coefficient to obtain the standard average daily oil production.

[0105] The final recoverable quantity prediction module 83 is used to predict the final recoverable quantity of the target well based on the obtained standard average daily oil production and the first correspondence between the final recoverable quantity and the standard average daily oil production.

[0106] In some embodiments, the daily production acquisition module 81 is further configured to acquire 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 following the maximum daily oil and gas production.

[0107] The standardization module 82 is further configured to standardize the average daily gas production by using the standardization coefficient, to obtain a standard average daily gas production.

[0108] The ultimate recoverable reserves prediction module 83 is further configured to predict the ultimate recoverable gas reserves of the target well according to the obtained standard average daily gas production, by using a second corresponding relationship between the ultimate recoverable gas reserves and the standard average daily gas production.

[0109] In some embodiments, the device described above further comprises an ultimate oil equivalent conversion module 84, configured to:

[0110] determine the ultimate oil equivalent of the target well by using the following formula:

[0111]

[0112] wherein, is the ultimate oil equivalent of the production well, is the ultimate oil reserves of the production well, is the ultimate gas reserves of the production well, is a conversion coefficient of unit gas corresponding to unit oil with heat value.

[0113] As to the device in the above embodiments, the specific manner in which each module performs the operation has been described in detail in the embodiments of the method, and thus will not be described in detail here.

[0114] Based on the inventive concept of the present application, the embodiments of the present application further provide a computer storage medium, wherein computer executable instructions are stored in the computer storage medium, and the computer executable instructions are executed by a processor to implement the shale oil and gas ultimate recoverable oil and gas reserves rapid evaluation method.

[0115] Based on the inventive concept of the present application, the embodiments of the present application further provide a server, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the shale oil and gas ultimate recoverable oil and gas reserves rapid evaluation method.

[0116] The terms such as "processing," "computing," "calculating," "determining," "displaying," and the like can refer to one or more processing or computing systems, or similar devices, acting on data

[0117] It should be apparent that the specific order and hierarchy of steps in the processes disclosed are examples of exemplary methods. Based upon design preferences, it should be understood that the specific order and hierarchy of steps in the processes could be reordered or rearranged without departing from the scope of the disclosure. The accompanying methods present the elements of various steps in exemplary order, and are not intended to be limited to the specific order or hierarchy presented.

[0118] Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

[0119] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral to the processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In the alternative, the processor and the storage medium can reside as discrete components in a user terminal.

[0120] For a software implementation, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes can be stored in memory units and executed by processors. The memory unit can be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.

[0121] The above description includes one or more examples of the embodiments. Of course, not all possible combinations of components or methods described above can be claimed as embodiments. One of ordinary skill in the art can recognize that modifications and permutations of various acts described herein can be used to configure other embodiments and that the scope of the disclosure should not be limited to the specific embodiments described herein. Additionally, the term "comprising" is used herein to mean that the claimed components include the referenced components and any additional components. The term "comprising" is used herein to mean the inclusion of the referenced components, but not to the exclusion of additional components. Further, the use of the term "or" is meant to encompass both "and" and "or" unless otherwise indicated. The term "first," "second," "third," etc. are used to describe various components, but are not meant to be a permanent designation.

Claims

1. A method for rapid evaluation of ultimate recoverable oil and gas from shale, characterized in that, The method comprises: obtaining an average daily oil production of a target well, the target well being a shale oil production well, the average daily oil production being an average daily oil production of the target well in the third month after a maximum daily oil production of the target well; determining a standardization coefficient according to a fracturing section parameter of the target well and an average value of a corresponding fracturing section parameter by the following formula: S is the normalized coefficient of the production well, L i is the length of the fracturing section of the production well, P i is the amount of proppant used per meter of the fracturing section of the production well, F 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 of the fracturing section of the production well, is the average value of the length of the fracturing section, is the average value of the amount of proppant used per meter, is the average value of the amount of fracturing fluid used per meter, is the average value of the number of fracturing clusters, n1, n2, n3 and n4 are single-factor nonlinear regression empirical coefficients between the corresponding fracturing section parameters and the final recoverable oil and gas volume, respectively. standardizing the average daily oil production by using the standardization coefficient to obtain a standard average daily oil production; predicting a final recoverable oil volume of the target well by using a first correspondence between a final recoverable oil volume and a standard average daily oil production according to the obtained standard average daily oil production; the first correspondence is determined in advance by the following method: obtaining a first correspondence between a final recoverable oil volume and a standard average daily oil production by fitting according to a final recoverable oil volume and a standard average daily oil production of a sample well.

2. The method of claim 1, wherein, The first correspondence is: EUR oil = a x IPO (2) In formula (2), EUR oil IPO is the standard average daily oil production of the production well, and a is a regression empirical coefficient between the standard average daily oil production and the ultimate recoverable oil.

3. The method of claim 1, wherein, The average value of the fracturing section length, the average value of the amount of proppant used per meter, the average value of the amount of fracturing fluid used per meter, and the average value of the fracturing cluster number are all average values of corresponding fracturing section parameters of production wells in a work area where the target well is located and / or in a neighboring work area.

4. The method of claim 1, wherein, The standardization of the average daily oil production by using the standardization coefficient to obtain a standard average daily oil production comprises: standardizing the average daily oil production by using the standardization coefficient according to the following formula (3) to obtain a standard average daily oil production: IPO = IPO i x S (3) In formula (3), IPO is the standard average daily oil production of the production well, IPO i is the average daily oil production before standardization of the production well.

5. The method of claim 1, wherein, The method further comprises: obtaining an average daily gas production of the target well, the average daily gas production being an average daily gas production of the target well in the third month after a maximum daily oil and gas production of the target well; standardizing the average daily gas production by using the standardization coefficient to obtain a standard average daily gas production; predicting a final recoverable gas volume of the target well by using a second correspondence between a final recoverable gas volume and a standard average daily gas production according to the obtained standard average daily gas production.

6. The method of claim 5, wherein, The method further comprises: determining a final recoverable oil equivalent of the target well by using the following formula (4): EUR BOE = EUR oil + d x 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 of the production well, EUR gas is the final recoverable gas of the production well, d is a conversion factor of unit gas equivalent to unit oil of heat value.

7. The method of claim 5, wherein, The average daily oil production comprises a total volume of average daily black oil, light oil, and condensate oil; The average daily gas production comprises a total volume of average daily C1-C5 gas.

8. A device for rapid evaluation of ultimate recoverable oil and gas of shale oil and gas, characterized in that, The device comprises: a daily production obtaining module configured to obtain an average daily oil production of a target well, the target well being a shale oil production well, the average daily oil production being an average daily oil production of the target well in the third month after a maximum daily oil production of the target well; a standardization module configured to determine a standardization coefficient according to a fracturing section parameter of the target well and an average value of a corresponding fracturing section parameter by the following formula (1), and to standardize the average daily oil production by using the standardization coefficient to obtain a standard average daily oil production: S is the normalized coefficient of the production well, L i is the length of the fracturing section of the production well, P i is the proppant amount per meter of the fracturing section of the production well, F i is the fracturing fluid amount per meter of the fracturing section of the production well, C i is the number of fracturing clusters of the fracturing section of the production well, is the average value of the length of the fracturing section, is the average value of the proppant amount per meter, is the average value of the fracturing fluid amount per meter, is the average value of the number of fracturing clusters, n1, n2, n3 and n4 are single-factor nonlinear regression empirical coefficients between the corresponding fracturing section parameters and the final recoverable oil and gas amount, respectively. a final recoverable volume predicting module configured to predict a final recoverable oil volume of the target well by using a first correspondence between a final recoverable oil volume and a standard average daily oil production according to the obtained standard average daily oil production; the first correspondence is determined in advance by the following method: obtaining a first correspondence between a final recoverable oil volume and a standard average daily oil production by fitting according to a final recoverable oil volume and a standard average daily oil production of a sample well.

9. A computer storage medium, characterized in that The computer storage medium stores computer executable instructions, and the computer executable instructions are executed by a processor to realize the shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method in any one of claims 1-7.

10. A server, characterized by The computer storage medium stores computer executable instructions, and the computer executable instructions are executed by a processor to realize the shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method in any one of claims 1-7. The computer storage medium stores computer executable instructions, and the computer executable instructions are executed by a processor to realize the shale oil and gas ultimate recoverable oil and gas volume rapid evaluation method in any one of claims 1-7.

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