Method, device and equipment for calculating carbon dioxide injection amount of shale oil well and storage medium

Abstract

The invention belongs to the technical field of shale oil development, and provides a shale oil well carbon dioxide injection amount calculation method, device and equipment and a storage medium. Calculating a carbon dioxide absorption section length according to the fracturing section length, and calculating a carbon dioxide action space volume according to the carbon dioxide absorption section length; the volume of a shale oil well fracturing area is calculated according to the fracturing parameters, and the volume of water in the carbon dioxide action range is calculated according to the volume of the shale oil well fracturing area; calculating the volume of crude oil in the carbon dioxide action range according to the first data and the volume of the carbon dioxide action space, and calculating the amount of carbon dioxide according to the volume of the crude oil in the carbon dioxide action range, the first data, the volume of water in the carbon dioxide action range and the volume of the crude oil in the carbon dioxide action range. According to the method, the optimal carbon dioxide injection rate of the well can be quickly calculated, so that the problem that the carbon dioxide injection rate of the shale oil well is not scientifically and efficiently calculated at present is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of shale oil development, and in particular to a method, device, equipment and storage medium for calculating the amount of carbon dioxide injected into a shale oil well. Background Art

[0002] At present, injecting carbon dioxide into shale oil reservoirs to improve recovery has become an effective means to increase production and efficiency of old shale oil wells. At present, the amount of carbon dioxide injected in most shale oil wells is optimized by empirical methods and numerical simulation research methods. Among them, the empirical method is artificially given by designers through field test results, which is one-sided; the numerical simulation research method requires both geological models as support and good numerical models, and the calculation process is relatively complex and time-consuming. Therefore, it is urgent to establish a method for calculating the amount of carbon dioxide injected in shale oil wells based on basic parameters such as reservoir geological characteristics, fracturing and monitoring parameters, oil phase characteristics, and production parameters, so as to provide more reliable guidance and basis for the optimization of shale oil carbon dioxide throughput or carbon dioxide flooding schemes.

[0003] By searching the prior art, it is found that the prior art and research methods similar to this patent include "Oil production method, CO2 injection amount determination method and device for assisting throughput and oil increase (CN111764875A)", "A method for improving the recovery rate of shale oil wells by carbon dioxide composite throughput (CN111022006A)", "A new method for improving shale porosity and permeability conditions (CN113431546A)", "A shale oil reservoir nitrogen-assisted carbon dioxide fracturing and development integrated method (CN112377166A)", "Tang Weiyu, Huang Ziyi, Chen Chao et al. Jimusar shale oil CO_2 throughput scheme optimization and experimental effect evaluation [J]. Special Oil and Gas Reservoirs, 2022, 29 (03): 131-137.", etc. In general, the prior art methods are either too simple or too theoretical, and cannot realize the targeted calculation of carbon dioxide injection amount for shale oil wells.

[0004] The invention with patent number CN111764875A proposes an oil production method, a method and device for determining the amount of CO2 injection for assisting in increasing oil production, and a method for calculating the amount of carbon dioxide injection in heavy oil reservoirs. This method calculates the amount of carbon dioxide based on parameters such as the geology of the heavy oil reservoir and the physical properties of the fluid, and is not suitable for unconventional shale reservoirs.

[0005] The invention with patent number CN111022006A proposes a method for improving the recovery rate of shale oil wells by composite carbon dioxide throughput, and proposes a carbon dioxide injection amount of 50-75t, which is preferably 1.5 times the effective thickness of the formation. This method only considers the formation thickness and fails to fully consider the particularity of shale oil reservoirs.

[0006] The invention with patent number CN113431546A proposes a new method to improve the porosity and permeability conditions of shale, and proposes to inject 500 tons of liquid carbon dioxide every 1,000 meters in the horizontal section of the shale well. The amount of carbon dioxide injected given by this method is too absolute and cannot be implemented in an individualized manner according to the geological conditions, fracturing scale and production stage of different wells.

[0007] The invention with patent number CN112377166A proposes an integrated method for nitrogen-assisted carbon dioxide fracturing and development of shale oil reservoirs, pointing out that the amount of carbon dioxide injected in each throughput cycle is 0.1 times the pore volume. As is known to all, shale oil reservoirs have no concept of pore volume, only fracture volume, so this method cannot be used to guide the calculation of carbon dioxide injection amount in shale oil reservoirs.

[0008] The article titled "Optimization of CO2 Huff-and-Puff Scheme for Jimusar Shale Oil and Evaluation of Experimental Results" describes that according to the reservoir profile, a basic model was established. On the basis of the numerical simulation model, the horizontal section length and oil layer thickness were first optimized, and the optimal injection volume per cycle was selected based on the actual injection rate. According to the numerical simulation process, the entire process is expected to take 7-10 days, requiring many prerequisites and taking a long time.

[0009] In summary, the amount of carbon dioxide given by the existing methods is based on experience and recommendation, and it is impossible to provide a scientific calculation method. Therefore, it is necessary to establish a more targeted new method for calculating the amount of carbon dioxide injected into shale reservoirs based on the particularity of shale reservoirs, reservoir parameters, geochemical indicators, fracturing parameters and fracture monitoring data, production parameters, etc. Summary of the invention

[0010] The purpose of the present invention is to provide a method, device, equipment and storage medium for calculating the amount of carbon dioxide injected into a shale oil well, so as to improve the above-mentioned problems.

[0011] In order to achieve the above objectives, the present application provides the following technical solutions:

[0012] On the one hand, an embodiment of the present application provides a method for calculating the amount of carbon dioxide injected into a shale oil well, the method comprising:

[0013] Acquire first data, the first data including reservoir parameters, fracturing parameters, production data, and solubility of oil and water in carbon dioxide, respectively. The reservoir parameters include reservoir temperature, pressure, crude oil density, ultimate recoverable reserves, free hydrocarbon content, and reservoir shale density; the fracturing parameters include fracturing section length, fracturing fluid volume, fracture half-length, and fracture height; the production data include cumulative oil production and cumulative water production before measures; the solubility of oil and water in carbon dioxide respectively includes carbon dioxide solubility in crude oil under reservoir conditions and carbon dioxide solubility in fracturing water;

[0014] Calculating the length of the carbon dioxide absorption section according to the fracturing section length, and calculating the volume of the carbon dioxide action space according to the carbon dioxide absorption section length;

[0015] Calculating the volume of the shale oil well fracturing area according to the fracturing parameters, and calculating the volume of water within the carbon dioxide action range according to the carbon dioxide action space volume and the shale oil well fracturing area volume;

[0016] The volume of crude oil within the carbon dioxide action range is calculated based on the first data and the volume of the carbon dioxide action space, and the carbon dioxide usage is calculated based on the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range.

[0017] Optionally, calculating the length of the carbon dioxide absorption section according to the fracturing section length, and calculating the volume of the carbon dioxide action space according to the carbon dioxide absorption section length, includes:

[0018] The proportion of the main liquid production section to the fracturing section length is obtained, and the proportion is recorded as the carbon dioxide absorption section ratio of the shale oil well. According to the fracturing section length and the carbon dioxide absorption section ratio of the shale oil well, the carbon dioxide absorption section length is calculated by formula (1), and the formula (1) is:

[0019] L g =g r *L F (1)

[0020] In formula (1), L g is the length of the carbon dioxide absorption segment, g r is the proportion of carbon dioxide absorption section in shale oil wells, L F is the fracturing section length;

[0021] The lateral action radius and the longitudinal action radius of the carbon dioxide injection into the shale oil well are obtained, and the carbon dioxide action space volume is calculated according to the lateral action radius, the longitudinal action radius, the carbon dioxide absorption section length and formula (2), and the formula (2) is:

[0022] V C =πabL g (2)

[0023] In formula (2), V C is the volume of the carbon dioxide action space, a is the lateral action radius, and b is the longitudinal action radius.

[0024] Optionally, the volume of the shale oil well fracturing area is calculated according to the fracturing parameters, and the volume of water within the carbon dioxide action range is calculated according to the carbon dioxide action space volume and the shale oil well fracturing area volume, including:

[0025] According to the fracturing parameters and formula (3), the volume of the fracturing area of ​​the shale oil well is calculated, and the formula (3) is:

[0026] V*=L C H C L F (3)

[0027] In formula (3), V* is the volume of the shale oil well fracturing area, L F is the fracturing section length, L C is the crack half length, H C For seam height;

[0028] The volume of water within the action range of carbon dioxide is calculated according to formula (4), which is:

[0029]

[0030] In formula (4), V CW V is the amount of water within the action range of carbon dioxide, F is the amount of fracturing fluid, Q W Cumulative water production.

[0031] Optionally, the volume of crude oil within the carbon dioxide action range is calculated according to the first data and the volume of the carbon dioxide action space, and the carbon dioxide usage is calculated according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range, and the volume of crude oil within the carbon dioxide action range, including:

[0032] According to formula (5), the first data and the volume of the carbon dioxide action space, the volume of crude oil within the carbon dioxide action range is calculated. The formula (5) is:

[0033]

[0034] In formula (5), V CO is the volume of crude oil within the range of carbon dioxide action, ρ S is the reservoir shale density, Q O is the cumulative oil production before the measure, EUR is the ultimate recoverable reserves, S1* is the free hydrocarbon content, ρ O is the density of crude oil;

[0035] The carbon dioxide dosage is calculated according to formula (6), the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range, and the volume of crude oil within the carbon dioxide action range. The formula (6) is:

[0036]

[0037] In formula (6), M C is the amount of carbon dioxide injected, P V is the empirical coefficient, S OC is the solubility of carbon dioxide in crude oil under reservoir conditions, S WC is the solubility of carbon dioxide in fracturing water.

[0038] In a second aspect, an embodiment of the present application provides a device for calculating the amount of carbon dioxide injected into a shale oil well, the device comprising an acquisition module, a first calculation module, a second calculation module and a third calculation module.

[0039] An acquisition module is used to acquire first data, wherein the first data includes reservoir parameters, fracturing parameters, production data, and solubility of oil and water in carbon dioxide, respectively. The reservoir parameters include reservoir temperature, pressure, crude oil density, ultimate recoverable reserves, free hydrocarbon content, and reservoir shale density; the fracturing parameters include fracturing section length, fracturing fluid volume, fracture half-length, and fracture height; the production data includes cumulative oil production and cumulative water production before measures; the solubility of oil and water in carbon dioxide, respectively, includes carbon dioxide solubility in crude oil under reservoir conditions and carbon dioxide solubility in fracturing water;

[0040] A first calculation module, used to calculate the length of the carbon dioxide absorption section according to the fracturing section length, and to calculate the volume of the carbon dioxide action space according to the carbon dioxide absorption section length;

[0041] A second calculation module is used to calculate the volume of the shale oil well fracturing area according to the fracturing parameters, and calculate the volume of water within the carbon dioxide action range according to the carbon dioxide action space volume and the shale oil well fracturing area volume;

[0042] The third calculation module is used to calculate the volume of crude oil within the carbon dioxide action range according to the first data and the volume of the carbon dioxide action space, and to calculate the carbon dioxide usage according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range.

[0043] Optionally, the first computing module includes:

[0044] The first calculation unit is used to obtain the proportion of the main liquid production section to the fracturing section length, and record the proportion as the carbon dioxide absorption section ratio of the shale oil well. According to the fracturing section length and the carbon dioxide absorption section ratio of the shale oil well, the carbon dioxide absorption section length is calculated by formula (1), and the formula (1) is:

[0045] L g =g r *L F (1)

[0046] In formula (1), L g is the length of the carbon dioxide absorption segment, g r is the proportion of carbon dioxide absorption section in shale oil wells, L F is the fracturing section length;

[0047] The second calculation unit is used to obtain the lateral action radius and the longitudinal action radius of the carbon dioxide injection into the shale oil well, and calculate the carbon dioxide action space volume according to the lateral action radius, the longitudinal action radius, the carbon dioxide absorption section length and formula (2), and the formula (2) is:

[0048] V C =πabL g (2)

[0049] In formula (2), V C is the volume of the carbon dioxide action space, a is the lateral action radius, and b is the longitudinal action radius.

[0050] Optionally, the second computing module includes:

[0051] The third calculation unit is used to calculate the volume of the shale oil well fracturing area according to the fracturing parameters and formula (3), and the formula (3) is:

[0052] V*=L C H C L F (3)

[0053] In formula (3), V* is the volume of the shale oil well fracturing area, L F is the fracturing section length, L C is the crack half length, H C For seam height;

[0054] The fourth calculation unit is used to calculate the volume of water within the action range of carbon dioxide according to formula (4), wherein formula (4) is:

[0055]

[0056] In formula (4), V CW V is the amount of water within the action range of carbon dioxide, F is the amount of fracturing fluid, Q W Cumulative water production.

[0057] Optionally, the volume of crude oil within the carbon dioxide action range is calculated according to the first data and the volume of the carbon dioxide action space, and the carbon dioxide usage is calculated according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range, and the volume of crude oil within the carbon dioxide action range, including:

[0058] The fifth calculation unit is used to calculate the volume of crude oil within the carbon dioxide action range according to formula (5), the first data and the carbon dioxide action space volume, and the formula (5) is:

[0059]

[0060] In formula (5), V CO is the volume of crude oil within the range of carbon dioxide action, ρ S is the reservoir shale density, Q O is the cumulative oil production before the measure, EUR is the ultimate recoverable reserves, S1* is the free hydrocarbon content, ρ O is the density of crude oil;

[0061] The sixth calculation unit is used to calculate the carbon dioxide usage according to formula (6), the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range, wherein the formula (6) is:

[0062]

[0063] In formula (6), M C is the amount of carbon dioxide injected, P V is the empirical coefficient, S OC is the solubility of carbon dioxide in crude oil under reservoir conditions, S WC is the solubility of carbon dioxide in fracturing water.

[0064] In a third aspect, an embodiment of the present application provides a device for calculating the amount of carbon dioxide injected into a shale oil well, the device comprising a memory and a processor. The memory is used to store a computer program; the processor is used to implement the steps of the above-mentioned method for calculating the amount of carbon dioxide injected into a shale oil well when executing the computer program.

[0065] In a fourth aspect, an embodiment of the present application provides a storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the above-mentioned method for calculating the amount of carbon dioxide injected into a shale oil well are implemented.

[0066] The beneficial effects of the present invention are:

[0067] 1. The purpose of the present invention is to provide a method for calculating the amount of carbon dioxide injected into a shale oil reservoir. The method has the characteristics of sufficient basis, simplicity and ease of operation. After understanding the oil reservoir and engineering parameters of the well, the optimal amount of carbon dioxide injected into the well can be quickly calculated, thereby solving the problem that there is currently no scientific and efficient calculation of the amount of carbon dioxide injected into shale oil wells.

[0068] 2. In view of the problem that there is no scientific and efficient method for calculating the amount of carbon dioxide injected into shale oil wells, the present invention provides a method for calculating the amount of carbon dioxide injected into shale oil wells, which can provide a basis for calculating the amount of carbon dioxide injected for implementing carbon dioxide throughput or carbon dioxide flooding to increase oil production in shale oil wells.

[0069] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0071] Figure 1 1 is a flow chart of a method for calculating the amount of carbon dioxide injected into a shale oil well according to an embodiment of the present invention;

[0072] Figure 2 Schematic diagram of the structure of the device for calculating the amount of carbon dioxide injected into a shale oil well according to an embodiment of the present invention;

[0073] Figure 3 It is a schematic diagram of the structure of the device for calculating the amount of carbon dioxide injected into a shale oil well described in an embodiment of the present invention. DETAILED DESCRIPTION

[0074] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0075] It should be noted that similar reference numerals or letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0076] Example 1

[0077] like Figure 1 As shown, this embodiment provides a method for calculating the amount of carbon dioxide injected into a shale oil well, which includes step S1, step S2, step S3 and step S4.

[0078] Step S1, obtaining first data, wherein the first data includes reservoir parameters, fracturing parameters, production data, and solubility of oil and water in carbon dioxide, respectively. The reservoir parameters include reservoir temperature, pressure, crude oil density, ultimate recoverable reserves, free hydrocarbon content, and reservoir shale density; the fracturing parameters include fracturing section length, fracturing fluid volume, fracture half-length, and fracture height; the production data includes cumulative oil production and cumulative water production before measures; the solubility of oil and water in carbon dioxide, respectively, includes carbon dioxide solubility in crude oil under reservoir conditions and carbon dioxide solubility in fracturing water;

[0079] Step S2, calculating the length of the carbon dioxide absorption section according to the fracturing section length, and calculating the volume of the carbon dioxide action space according to the carbon dioxide absorption section length;

[0080] The specific implementation steps of this step include step S21 and step S22;

[0081] Step S21, obtaining the proportion of the main liquid production section to the fracturing section length, and recording the proportion as the carbon dioxide absorption section ratio of the shale oil well, and calculating the carbon dioxide absorption section length according to the fracturing section length and the carbon dioxide absorption section ratio of the shale oil well by formula (1), the formula (1) is:

[0082] L g =g r *L F (1)

[0083] In formula (1), L g is the length of the carbon dioxide absorption segment, g r is the proportion of carbon dioxide absorption section in shale oil wells, L F is the fracturing section length;

[0084] Step S22, obtaining the lateral action radius and the longitudinal action radius of the carbon dioxide injection into the shale oil well, and calculating the carbon dioxide action space volume according to the lateral action radius, the longitudinal action radius, the carbon dioxide absorption section length and formula (2), the formula (2) is:

[0085] V C =πabL g (2)

[0086] In formula (2), V C is the volume of the carbon dioxide action space, a is the lateral action radius, and b is the longitudinal action radius.

[0087] Step S3, calculating the volume of the shale oil well fracturing area according to the fracturing parameters, and calculating the volume of water within the carbon dioxide action range according to the carbon dioxide action space volume and the shale oil well fracturing area volume;

[0088] The specific implementation steps of this step include step S31 and step S32;

[0089] Step S31, according to the fracturing parameters and formula (3), the volume of the fracturing area of ​​the shale oil well is calculated, and the formula (3) is:

[0090] V*=L C H C L F (3)

[0091] In formula (3), V* is the volume of the shale oil well fracturing area, L F is the fracturing section length, L C is the crack half length, H C For seam height;

[0092] Step S32: Calculate the volume of water within the action range of carbon dioxide according to formula (4), where formula (4) is:

[0093]

[0094] In formula (4), V CW V is the amount of water within the action range of carbon dioxide, F is the amount of fracturing fluid, Q W Cumulative water production.

[0095] Step S4, calculating the volume of crude oil within the carbon dioxide action range according to the first data and the volume of the carbon dioxide action space, and calculating the carbon dioxide usage according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range.

[0096] The specific implementation steps of this step include step S41 and step S42;

[0097] Step S41, according to formula (5), the first data and the volume of the carbon dioxide action space, the volume of crude oil within the carbon dioxide action range is calculated, and the formula (5) is:

[0098]

[0099] In formula (5), V CO is the volume of crude oil within the range of carbon dioxide action, ρ S is the reservoir shale density, Q O is the cumulative oil production before the measure, EUR is the ultimate recoverable reserves, S1* is the free hydrocarbon content, ρ O is the density of crude oil;

[0100] Step S42, the carbon dioxide dosage is calculated according to formula (6), the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range, and the formula (6) is:

[0101]

[0102] In formula (6), M C is the amount of carbon dioxide injected, P V is the empirical coefficient, S OC is the solubility of carbon dioxide in crude oil under reservoir conditions, S WC is the solubility of carbon dioxide in fracturing water, where P V Take 0.4, and 509 in formula (6) is the standard cubic meter to mass conversion factor of carbon dioxide (1 ton of carbon dioxide = 509 standard cubic meters);

[0103] This embodiment provides a method for calculating the amount of carbon dioxide injected into a shale oil well. The method can calculate the amount of carbon dioxide required for carbon dioxide throughput or carbon dioxide flooding to increase production in a shale oil well based on the reservoir parameters, fracturing parameters, production data, and the amount of carbon dioxide dissolved in oil and water of the shale oil well, and is applicable to shale oil reservoirs. With the help of this method, the amount of carbon dioxide required for a shale oil well can be quickly calculated, and the scientificity and efficiency of calculating the amount of carbon dioxide used for carbon dioxide throughput or carbon dioxide flooding in a shale oil well can be achieved, thereby improving the efficient implementation of carbon dioxide injection technology for increasing production in shale oil wells, and becoming a research tool for the key injection and production parameter of carbon dioxide throughput or carbon dioxide flooding in shale oil wells, namely, the amount of carbon dioxide injected.

[0104] By comparing the numerical simulation method and the empirical method (Table 1), it can be seen that the amount of carbon dioxide injected calculated by the invention is close to the numerical simulation result. Compared with the 10-day calculation process of the numerical simulation, the calculation time can be effectively shortened by 95%, which improves the work efficiency. Compared with the empirical method, the carbon injection is reduced by 576 tons, the gas injection volume is saved, and the cost of the measure is reduced; at the same time, the initial daily oil increase is increased by 45.22%-84.19%, and the effect of the measure is better than the empirical method.

[0105] Table 1 Comparison of different calculation methods

[0106]

[0107] Example 2

[0108] like Figure 2 As shown, this embodiment provides a device for calculating the amount of carbon dioxide injected into a shale oil well, and the device includes an acquisition module 701, a first calculation module 702, a second calculation module 703 and a third calculation module 704.

[0109] The acquisition module 701 is used to acquire the first data, wherein the first data includes reservoir parameters, fracturing parameters, production data, and solubility of oil and water in carbon dioxide, wherein the reservoir parameters include reservoir temperature, pressure, crude oil density, ultimate recoverable reserves, free hydrocarbon content, and reservoir shale density; the fracturing parameters include fracturing section length, fracturing fluid volume, fracture half-length, and fracture height; the production data includes cumulative oil production and cumulative water production before the measure; the solubility of oil and water in carbon dioxide includes carbon dioxide solubility in crude oil under reservoir conditions and carbon dioxide solubility in fracturing water;

[0110] A first calculation module 702 is used to calculate the length of the carbon dioxide absorption section according to the fracturing section length, and calculate the volume of the carbon dioxide action space according to the carbon dioxide absorption section length;

[0111] A second calculation module 703 is used to calculate the volume of the shale oil well fracturing area according to the fracturing parameters, and calculate the volume of water within the carbon dioxide action range according to the carbon dioxide action space volume and the shale oil well fracturing area volume;

[0112] The third calculation module 704 is used to calculate the volume of crude oil within the carbon dioxide action range according to the first data and the volume of the carbon dioxide action space, and calculate the carbon dioxide usage according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range.

[0113] In a specific implementation of the present disclosure, the first calculation module 702 further includes a first calculation unit 7021 and a second calculation unit 7022 .

[0114] The first calculation unit 7021 is used to obtain the proportion of the main liquid production section to the fracturing section length, and record the proportion as the carbon dioxide absorption section ratio of the shale oil well. According to the fracturing section length and the carbon dioxide absorption section ratio of the shale oil well, the carbon dioxide absorption section length is calculated by formula (1), and the formula (1) is:

[0115] L g =gr *L F (1)

[0116] In formula (1), L g is the length of the carbon dioxide absorption segment, g r is the proportion of carbon dioxide absorption section in shale oil wells, L F is the fracturing section length;

[0117] The second calculation unit 7022 is used to obtain the lateral action radius and the longitudinal action radius of the carbon dioxide injection into the shale oil well, and calculate the carbon dioxide action space volume according to the lateral action radius, the longitudinal action radius, the carbon dioxide absorption section length and formula (2), and the formula (2) is:

[0118] V C =πabL g (2)

[0119] In formula (2), V C is the volume of the carbon dioxide action space, a is the lateral action radius, and b is the longitudinal action radius.

[0120] In a specific implementation of the present disclosure, the second calculation module 703 further includes a third calculation unit 7031 and a fourth calculation unit 7032 .

[0121] The third calculation unit 7031 is used to calculate the volume of the shale oil well fracturing area according to the fracturing parameters and formula (3), and the formula (3) is:

[0122] V*=L C H C L F (3)

[0123] In formula (3), V* is the volume of the shale oil well fracturing area, L F is the fracturing section length, L C is the crack half length, H C For seam height;

[0124] The fourth calculation unit 7032 is used to calculate the volume of water within the action range of carbon dioxide according to formula (4), wherein formula (4) is:

[0125]

[0126] In formula (4), V CW V is the amount of water within the action range of carbon dioxide, F is the amount of fracturing fluid, Q W Cumulative water production.

[0127] In a specific implementation of the present disclosure, the third calculation module 704 further includes a fifth calculation unit 7041 and a sixth calculation unit 7042 .

[0128] The fifth calculation unit 7041 is used to calculate the volume of crude oil within the carbon dioxide action range according to formula (5), the first data and the carbon dioxide action space volume. The formula (5) is:

[0129]

[0130] In formula (5), V CO is the volume of crude oil within the range of carbon dioxide action, ρ S is the reservoir shale density, Q O is the cumulative oil production before the measure, EUR is the ultimate recoverable reserves, S1* is the free hydrocarbon content, ρ O is the density of crude oil;

[0131] The sixth calculation unit 7042 is used to calculate the carbon dioxide usage according to formula (6), the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range, and the volume of crude oil within the carbon dioxide action range. The formula (6) is:

[0132]

[0133] In formula (6), M C is the amount of carbon dioxide injected, P V is the empirical coefficient, S OC is the solubility of carbon dioxide in crude oil under reservoir conditions, S WC is the solubility of carbon dioxide in fracturing water.

[0134] It should be noted that, regarding the device in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment of the method, and will not be elaborated here.

[0135] Example 3

[0136] Corresponding to the above method embodiment, the embodiment of the present disclosure also provides a device for calculating the amount of carbon dioxide injected into a shale oil well. The device for calculating the amount of carbon dioxide injected into a shale oil well described below and the method for calculating the amount of carbon dioxide injected into a shale oil well described above can be referenced to each other.

[0137] Figure 3 FIG. 8 is a block diagram of a shale oil well carbon dioxide injection amount calculation device 800 according to an exemplary embodiment. Figure 3As shown, the shale oil well carbon dioxide injection amount calculation device 800 may include: a processor 801, a memory 802. The shale oil well carbon dioxide injection amount calculation device 800 may also include one or more of a multimedia component 803, an I / O interface 804, and a communication component 805.

[0138] The processor 801 is used to control the overall operation of the shale oil well carbon dioxide injection amount calculation device 800 to complete all or part of the steps in the above-mentioned shale oil well carbon dioxide injection amount calculation method. The memory 802 is used to store various types of data to support the operation of the shale oil well carbon dioxide injection amount calculation device 800, and these data may include, for example, instructions for any application or method operating on the shale oil well carbon dioxide injection amount calculation device 800, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, disk or optical disk. The multimedia component 803 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 802 or sent via the communication component 805. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 804 provides an interface between the processor 801 and other interface modules, and the above-mentioned other interface modules can be keyboards, mice, buttons, etc. These buttons can be virtual buttons or physical buttons. The communication component 805 is used for wired or wireless communication between the shale oil well carbon dioxide injection amount calculation device 800 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 805 can include: Wi-Fi module, Bluetooth module, NFC module.

[0139] In an exemplary embodiment, the shale oil well carbon dioxide injection amount calculation device 800 can be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, referred to as ASIC), digital signal processors (Digital Signal Processing Device, referred to as DSP), digital signal processing devices (Digital Signal Processing Device, referred to as DSPD), programmable logic devices (Programmable Logic Device, referred to as PLD), field programmable gate arrays (Field Programmable Gate Array, referred to as FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned shale oil well carbon dioxide injection amount calculation method.

[0140] In another exemplary embodiment, a computer storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned method for calculating the amount of carbon dioxide injected into a shale oil well are implemented. For example, the computer storage medium can be the above-mentioned memory 802 including program instructions, and the above-mentioned program instructions can be executed by the processor 801 of the shale oil well carbon dioxide injection amount calculation device 800 to complete the above-mentioned method for calculating the amount of carbon dioxide injected into a shale oil well.

[0141] Example 4

[0142] Corresponding to the above method embodiment, the embodiment of the present disclosure further provides a storage medium. The storage medium described below and the method for calculating the amount of carbon dioxide injected into a shale oil well described above can be referenced to each other.

[0143] A storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for calculating the amount of carbon dioxide injected into a shale oil well in the above method embodiment.

[0144] The storage medium may specifically be a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or other storage medium that can store program codes.

[0145] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for calculating the amount of carbon dioxide injected into a shale oil well, characterized in that: include: Acquire first data, the first data including reservoir parameters, fracturing parameters, production data, and solubility of oil and water in carbon dioxide, respectively. The reservoir parameters include reservoir temperature, pressure, crude oil density, ultimate recoverable reserves, free hydrocarbon content, and reservoir shale density; the fracturing parameters include fracturing section length, fracturing fluid volume, fracture half-length, and fracture height; the production data include cumulative oil production and cumulative water production before measures; the solubility of oil and water in carbon dioxide respectively includes carbon dioxide solubility in crude oil under reservoir conditions and carbon dioxide solubility in fracturing water; Calculating the length of the carbon dioxide absorption section according to the fracturing section length, and calculating the volume of the carbon dioxide action space according to the carbon dioxide absorption section length; Calculating the volume of the shale oil well fracturing area according to the fracturing parameters, and calculating the volume of water within the carbon dioxide action range according to the carbon dioxide action space volume and the shale oil well fracturing area volume; The volume of crude oil within the carbon dioxide action range is calculated based on the first data and the volume of the carbon dioxide action space, and the carbon dioxide usage is calculated based on the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range.

2. The method for calculating the amount of carbon dioxide injected into a shale oil well according to claim 1, characterized in that: Calculating the carbon dioxide absorption section length according to the fracturing section length, and calculating the carbon dioxide action space volume according to the carbon dioxide absorption section length, including: The proportion of the main liquid production section to the fracturing section length is obtained, and the proportion is recorded as the carbon dioxide absorption section ratio of the shale oil well. According to the fracturing section length and the carbon dioxide absorption section ratio of the shale oil well, the carbon dioxide absorption section length is calculated by formula (1), and the formula (1) is: L g =g r *L F (1) In formula (1), L g is the length of the carbon dioxide absorption segment, g r is the proportion of carbon dioxide absorption section in shale oil wells, L F is the fracturing section length; The lateral action radius and the longitudinal action radius of the carbon dioxide injection into the shale oil well are obtained, and the carbon dioxide action space volume is calculated according to the lateral action radius, the longitudinal action radius, the carbon dioxide absorption section length and formula (2), and the formula (2) is: V C =πabL g (2) In formula (2), V C is the volume of the carbon dioxide action space, a is the lateral action radius, and b is the longitudinal action radius.

3. The method for calculating the amount of carbon dioxide injected into a shale oil well according to claim 2, characterized in that: The volume of the shale oil well fracturing area is calculated according to the fracturing parameters, and the volume of water within the carbon dioxide action range is calculated according to the carbon dioxide action space volume and the shale oil well fracturing area volume, including: According to the fracturing parameters and formula (3), the volume of the fracturing area of ​​the shale oil well is calculated, and the formula (3) is: V*=L C H C L F (3) In formula (3), V* is the volume of the shale oil well fracturing area, L F is the fracturing section length, L C is the crack half length, H C For seam height; The volume of water within the action range of carbon dioxide is calculated according to formula (4), which is: In formula (4), V CW V is the amount of water within the range of carbon dioxide action, F is the fracturing fluid volume, Q W Cumulative water production.

4. The method for calculating the amount of carbon dioxide injected into a shale oil well according to claim 3, characterized in that: The method further comprises: calculating the volume of crude oil within the carbon dioxide action range according to the first data and the volume of the carbon dioxide action space; and calculating the carbon dioxide usage according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range, and the volume of crude oil within the carbon dioxide action range, including: According to formula (5), the first data and the volume of the carbon dioxide action space, the volume of crude oil within the carbon dioxide action range is calculated. The formula (5) is: In formula (5), V CO is the volume of crude oil within the range of carbon dioxide action, ρ S is the reservoir shale density, Q O is the cumulative oil production before the measure, EUR is the ultimate recoverable reserves, S1* is the free hydrocarbon content, ρ O is the density of crude oil; The carbon dioxide dosage is calculated according to formula (6), the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range, and the volume of crude oil within the carbon dioxide action range. The formula (6) is: In formula (6), M C is the amount of carbon dioxide injected, P V is the empirical coefficient, S OC is the solubility of carbon dioxide in crude oil under reservoir conditions, S WC is the solubility of carbon dioxide in fracturing water.

5. A device for calculating the amount of carbon dioxide injected into a shale oil well, characterized in that: include: An acquisition module is used to acquire first data, wherein the first data includes reservoir parameters, fracturing parameters, production data, and solubility of oil and water in carbon dioxide, respectively. The reservoir parameters include reservoir temperature, pressure, crude oil density, ultimate recoverable reserves, free hydrocarbon content, and reservoir shale density; the fracturing parameters include fracturing section length, fracturing fluid volume, fracture half-length, and fracture height; the production data includes cumulative oil production and cumulative water production before measures; the solubility of oil and water in carbon dioxide, respectively, includes carbon dioxide solubility in crude oil under reservoir conditions and carbon dioxide solubility in fracturing water; A first calculation module, used to calculate the length of the carbon dioxide absorption section according to the fracturing section length, and to calculate the volume of the carbon dioxide action space according to the carbon dioxide absorption section length; A second calculation module is used to calculate the volume of the shale oil well fracturing area according to the fracturing parameters, and calculate the volume of water within the carbon dioxide action range according to the carbon dioxide action space volume and the shale oil well fracturing area volume; The third calculation module is used to calculate the volume of crude oil within the carbon dioxide action range according to the first data and the volume of the carbon dioxide action space, and to calculate the carbon dioxide usage according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range.

6. The device for calculating the amount of carbon dioxide injected into a shale oil well according to claim 5, characterized in that: The first computing module includes: The first calculation unit is used to obtain the proportion of the main liquid production section to the fracturing section length, and record the proportion as the carbon dioxide absorption section ratio of the shale oil well. According to the fracturing section length and the carbon dioxide absorption section ratio of the shale oil well, the carbon dioxide absorption section length is calculated by formula (1), and the formula (1) is: L g =g r *L F (1) In formula (1), L g is the length of the carbon dioxide absorption segment, g r is the proportion of carbon dioxide absorption section in shale oil wells, L F is the fracturing section length; The second calculation unit is used to obtain the lateral action radius and the longitudinal action radius of the carbon dioxide injection into the shale oil well, and calculate the carbon dioxide action space volume according to the lateral action radius, the longitudinal action radius, the carbon dioxide absorption section length and formula (2), and the formula (2) is: V C =πabL g (2) In formula (2), V C is the volume of the carbon dioxide action space, a is the lateral action radius, and b is the longitudinal action radius.

7. The device for calculating the amount of carbon dioxide injected into a shale oil well according to claim 6, characterized in that: The second computing module includes: The third calculation unit is used to calculate the volume of the shale oil well fracturing area according to the fracturing parameters and formula (3), and the formula (3) is: V*=L C H C L F (3) In formula (3), V* is the volume of the shale oil well fracturing area, L F is the fracturing section length, L C is the crack half length, H C For seam height; The fourth calculation unit is used to calculate the volume of water within the action range of carbon dioxide according to formula (4), wherein formula (4) is: In formula (4), V CW V is the amount of water within the range of carbon dioxide action, F is the fracturing fluid volume, Q W Cumulative water production.

8. The device for calculating the amount of carbon dioxide injected into a shale oil well according to claim 7, characterized in that: The method further comprises: calculating the volume of crude oil within the carbon dioxide action range according to the first data and the volume of the carbon dioxide action space; and calculating the carbon dioxide usage according to the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range, and the volume of crude oil within the carbon dioxide action range, including: The fifth calculation unit is used to calculate the volume of crude oil within the carbon dioxide action range according to formula (5), the first data and the carbon dioxide action space volume, and the formula (5) is: In formula (5), V CO is the volume of crude oil within the range of carbon dioxide action, ρ S is the reservoir shale density, Q O is the cumulative oil production before the measure, EUR is the ultimate recoverable reserves, S1* is the free hydrocarbon content, ρ O is the density of crude oil; The sixth calculation unit is used to calculate the carbon dioxide usage according to formula (6), the volume of crude oil within the carbon dioxide action range, the first data, the volume of water within the carbon dioxide action range and the volume of crude oil within the carbon dioxide action range, wherein the formula (6) is: In formula (6), M C is the amount of carbon dioxide injected, P V is the empirical coefficient, S OC is the solubility of carbon dioxide in crude oil under reservoir conditions, S WC is the solubility of carbon dioxide in fracturing water.

9. Equipment for calculating the amount of carbon dioxide injected into shale oil wells, characterized in that: include: Memory for storing computer programs; A processor, used to implement the steps of the method for calculating the amount of carbon dioxide injected into a shale oil well as claimed in any one of claims 1 to 4 when executing the computer program.

10. A storage medium, characterized in that: The storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for calculating the amount of carbon dioxide injected into a shale oil well as claimed in any one of claims 1 to 4.

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