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

Abstract

The present application belongs to the technical field of shale oil development, and provides a shale oil well carbon dioxide injection amount calculation method, device, equipment and storage medium, the method comprising: obtaining first data; calculating 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; calculating the shale oil well fracturing area volume according to the fracturing parameters, and calculating the water volume in the carbon dioxide action range according to the shale oil well fracturing area volume; calculating the crude oil volume in the carbon dioxide action range according to the first data and the carbon dioxide action space volume, and calculating the carbon dioxide dosage according to the crude oil volume in the carbon dioxide action range, the first data, the water volume in the carbon dioxide action range and the crude oil volume in the carbon dioxide action range. The present application can quickly calculate the optimal carbon dioxide injection amount of the well, thereby solving the problem that there is no scientific and efficient calculation of the carbon dioxide injection amount of the shale oil well at present.

Description

Technical Field

[0001] This invention relates to the field of shale oil development technology, and more specifically, to a method, apparatus, equipment, and storage medium for calculating the amount of carbon dioxide injected into shale oil wells. Background Technology

[0002] Currently, CO2 injection into shale oil reservoirs has become an effective means to improve the production and efficiency of older shale oil wells. Most current CO2 injection volumes for shale oil wells are optimized using empirical methods and numerical simulations. However, empirical methods, derived from field test results by designers, are inherently biased. Numerical simulations require both geological models and well-fitting numerical models, making the calculation process complex and time-consuming. Therefore, there is an urgent need to establish a method for calculating CO2 injection volumes in shale oil wells based on reservoir geological characteristics, fracturing and monitoring parameters, oil phase characteristics, and production parameters. This would provide more reliable guidance and a basis for optimizing CO2 huff and puff or CO2 flooding schemes for shale oil production.

[0003] A search of existing technologies revealed similar technologies and research methods to this patent, including "Oil Production Methods, Method and Device for Determining CO2 Injection Volume for Assisted Huff and Puff Enhancement (CN111764875A)," "A Method for Improving Shale Oil Well Recovery Rate through Carbon Dioxide Composite Huff and Puff (CN111022006A)," "A New Method for Improving Shale Porosity and Permeability Conditions (CN113431546A)," "An Integrated Method for Nitrogen-Assisted Carbon Dioxide Fracturing and Development of Shale Oil Reservoirs (CN112377166A)," and "Tang Weiyu, Huang Ziyi, Chen Chao, et al. Optimization and Experimental Effect Evaluation of CO2 Huff and Puff Scheme for Jimsar Shale Oil [J]. Special Oil and Gas Reservoirs, 2022, 29(03):131-137." Overall, these existing technologies and methods are either too simplistic or too theoretical, failing to achieve targeted calculation of carbon dioxide injection volume 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 used to assist in oil production through huff and puff, and proposes 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 and fluid properties of heavy oil reservoirs, but it is not applicable to unconventional shale oil reservoirs.

[0005] The invention with patent number CN111022006A proposes a method for improving the recovery rate of shale oil wells through carbon dioxide composite injection and injection. It proposes that the carbon dioxide injection volume should be 50-75t, preferably 1.5 times the effective formation thickness. However, this method only considers the formation thickness and fails to take into account the special characteristics of shale oil reservoirs in a comprehensive manner.

[0006] The invention with patent number CN113431546A proposes a new method to improve the porosity and permeability conditions of shale, suggesting that 500 tons of liquid carbon dioxide be injected every 1000 meters in the horizontal section of a shale well. However, the amount of carbon dioxide injected given by this method is too absolute and cannot be implemented in a personalized 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 huff and puff cycle is 0.1 times the pore volume. As is well known, shale oil reservoirs do not have the concept of pore volume, but only fracture volume. Therefore, this method cannot be used to guide the calculation of carbon dioxide injection in shale oil reservoirs.

[0008] The article titled "Optimization and Evaluation of CO2 Huff and Puff Scheme in Jimsar Shale Oil" describes how a basic model was established based on the reservoir overview. Building upon the numerical simulation model, optimizations were first made for the horizontal section length and reservoir thickness. Then, based on the actual injection rate, the optimal injection volume per cycle was selected. According to the numerical simulation process, the entire process is expected to take 7-10 days, requiring numerous prerequisites and is time-consuming.

[0009] In summary, existing methods provide carbon dioxide injection figures based on experience and lack a scientifically sound calculation method. Therefore, it is necessary to develop a new, more targeted method for calculating carbon dioxide injection in shale oil reservoirs, taking into account their unique characteristics and incorporating reservoir parameters, geochemical indices, fracturing parameters and fracture monitoring data, and production parameters. Summary of the Invention

[0010] The purpose of this invention is to provide a method, apparatus, equipment, and storage medium for calculating carbon dioxide injection in shale oil wells, in order to improve the above-mentioned problems.

[0011] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0012] On the one hand, embodiments of this application provide a method for calculating the amount of carbon dioxide injected into shale oil wells, the method comprising:

[0013] The first data includes reservoir parameters, fracturing parameters, production data, and the solubility of oil and water in carbon dioxide. The reservoir parameters include reservoir temperature, pressure, crude oil density, final 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 fracturing. The solubility of oil and water in carbon dioxide includes the carbon dioxide solubility of crude oil under reservoir conditions and the carbon dioxide solubility in fracturing water.

[0014] The length of the carbon dioxide absorption section is calculated based on the length of the fracturing section, and the volume of the carbon dioxide-absorbing space is calculated based on the length of the carbon dioxide absorption section.

[0015] The volume of the fracturing zone in the shale oil well is calculated based on the fracturing parameters, and the volume of water within the carbon dioxide action area is calculated based on the volume of the carbon dioxide action space and the volume of the fracturing zone in the shale oil well.

[0016] Based on the first data and the volume of the space where carbon dioxide acts, the volume of crude oil within the range of carbon dioxide's action is calculated. The amount of carbon dioxide used is then calculated based on the volume of crude oil within the range of carbon dioxide's action, the first data, the volume of water within the range of carbon dioxide's action, and the volume of crude oil within the range of carbon dioxide's action.

[0017] Optionally, the length of the carbon dioxide absorption section is calculated based on the length of the fracturing section, and the volume of the carbon dioxide-absorbing space is calculated based on the length of the carbon dioxide absorption section, including:

[0018] Obtain the proportion of the main producing fluid section to the length of the fracturing section, and record the proportion as the carbon dioxide absorption section proportion of the shale oil well. Based on the length of the fracturing section and the carbon dioxide absorption section proportion of the shale oil well, calculate the length of the carbon dioxide absorption section using formula (1), which is:

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

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

[0021] Obtain the lateral and longitudinal radius of action of carbon dioxide injection in shale oil wells, and calculate the volume of the carbon dioxide action space based on the lateral radius, longitudinal radius, length of the carbon dioxide absorption section, and formula (2). Formula (2) is:

[0022] V C =πabL g (2)

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

[0024] Optionally, the volume of the fracturing zone in the shale oil well is calculated based on the fracturing parameters, and the volume of water within the carbon dioxide's effective range is calculated based on the volume of the space where carbon dioxide is applied and the volume of the fracturing zone in the shale oil well, including:

[0025] Based on the fracturing parameters and formula (3), the volume of the fracturing zone in the shale oil well is calculated. Formula (3) is as follows:

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

[0027] In formula (3), V* represents the volume of the fracturing zone in a shale oil well, and L... F For the length of the fracturing section, L C For crack half-length, H C For seam height;

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

[0029]

[0030] In formula (4), V CW V represents the amount of water within the effective range of carbon dioxide. F Q represents the fracturing fluid volume. W This refers to the cumulative water production.

[0031] Optionally, based on the first data and the volume of the space where the carbon dioxide acts, the volume of crude oil within the carbon dioxide's effective range is calculated. The amount of carbon dioxide used is then calculated based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range, including:

[0032] Based on formula (5), the first data, and the volume of the space where carbon dioxide acts, the volume of crude oil within the range where carbon dioxide acts is calculated. Formula (5) is:

[0033]

[0034] In formula (5), V CO ρ is the volume of crude oil within the range of carbon dioxide's effect. S Q represents the density of the oil reservoir shale. O The cumulative oil production before the measures, EUR is the final recoverable reserves, S1* is the free hydrocarbon content, and ρ O Density of crude oil;

[0035] The amount of carbon dioxide used is calculated based on formula (6), the volume of crude oil within the effective range of the carbon dioxide, the first data, the volume of water within the effective range of the carbon dioxide, and the volume of crude oil within the effective range of the carbon dioxide. Formula (6) is as follows:

[0036]

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

[0038] Secondly, embodiments of this application provide a device for calculating the amount of carbon dioxide injected into shale oil wells. The device includes an acquisition module, a first calculation module, a second calculation module, and a third calculation module.

[0039] The acquisition module is used to acquire first data, which includes reservoir parameters, fracturing parameters, production data, and the solubility of oil and water in carbon dioxide. The reservoir parameters include reservoir temperature, pressure, crude oil density, final 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 fracturing. The solubility of oil and water in carbon dioxide includes the carbon dioxide solubility of crude oil under reservoir conditions and the carbon dioxide solubility in fracturing water.

[0040] The first calculation module is used to calculate the length of the carbon dioxide absorption section based on the length of the fracturing section, and to calculate the volume of the carbon dioxide action space based on the length of the carbon dioxide absorption section.

[0041] The second calculation module is used to calculate the volume of the fracturing zone of the shale oil well based on the fracturing parameters, and to calculate the volume of water within the carbon dioxide action area based on the volume of the carbon dioxide action space and the volume of the fracturing zone of the shale oil well.

[0042] The third calculation module is used to calculate the volume of crude oil within the carbon dioxide's effective range based on the first data and the volume of the carbon dioxide's effective space, and to calculate the amount of carbon dioxide used based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range.

[0043] Optionally, the first computing module includes:

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

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

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

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

[0048] V C =πabL g (2)

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

[0050] Optional, the second computing module includes:

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

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

[0053] In formula (3), V* represents the volume of the fracturing zone in a shale oil well, and L... F For the length of the fracturing section, L C For crack half-length, H C For seam height;

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

[0055]

[0056] In formula (4), V CW V represents the amount of water within the effective range of carbon dioxide. F Q represents the fracturing fluid volume. W This refers to the cumulative water production.

[0057] Optionally, based on the first data and the volume of the space where the carbon dioxide acts, the volume of crude oil within the carbon dioxide's effective range is calculated. The amount of carbon dioxide used is then calculated based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range, including:

[0058] The fifth calculation unit is used to calculate the volume of crude oil within the carbon dioxide's effective range based on formula (5), the first data, and the volume of the carbon dioxide's effective space. Formula (5) is:

[0059]

[0060] In formula (5), V CO ρ is the volume of crude oil within the range of carbon dioxide's effect. S Q represents the density of the oil reservoir shale. O The cumulative oil production before the measures, EUR is the final recoverable reserves, S1* is the free hydrocarbon content, and ρ O Density of crude oil;

[0061] The sixth calculation unit is used to calculate the amount of carbon dioxide used based on formula (6), the volume of crude oil within the effective range of the carbon dioxide, the first data, the volume of water within the effective range of the carbon dioxide, and the volume of crude oil within the effective range of the carbon dioxide. The formula (6) is:

[0062]

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

[0064] Thirdly, embodiments of this application provide a device for calculating the amount of carbon dioxide injected into shale oil wells. The device includes a memory and a processor. The memory stores a computer program; the processor executes the computer program to implement the steps of the aforementioned method for calculating the amount of carbon dioxide injected into shale oil wells.

[0065] Fourthly, embodiments of this application provide a storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for calculating the amount of carbon dioxide injected into shale oil wells.

[0066] The beneficial effects of this invention are as follows:

[0067] 1. The purpose of this invention is to provide a method for calculating the amount of carbon dioxide injected into shale oil reservoirs. This method is characterized by sufficient evidence and simple operation. After understanding the 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 method for calculating the amount of carbon dioxide injected into shale oil wells.

[0068] 2. This invention addresses the lack of a scientific and efficient method for calculating the amount of carbon dioxide injected into shale oil wells. It 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 huff and puff or carbon dioxide flooding to increase oil production in shale oil wells.

[0069] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0070] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0071] Figure 1 This is a schematic diagram of the method for calculating carbon dioxide injection volume in shale oil wells as described in this embodiment of the invention;

[0072] Figure 2 This is a schematic diagram of the carbon dioxide injection calculation device for shale oil wells described in this embodiment of the invention;

[0073] Figure 3 This is a schematic diagram of the structure of the carbon dioxide injection calculation device for shale oil wells described in this embodiment of the invention. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0075] It should be noted that similar reference numerals or letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0076] Example 1

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

[0078] Step S1: Obtain first data, which includes reservoir parameters, fracturing parameters, production data, and the solubility of oil and water in carbon dioxide. The reservoir parameters include reservoir temperature, pressure, crude oil density, final 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 fracturing. The solubility of oil and water in carbon dioxide includes the carbon dioxide solubility of crude oil under reservoir conditions and the carbon dioxide solubility in fracturing water.

[0079] Step S2: Calculate the length of the carbon dioxide absorption section based on the length of the fracturing section, and calculate the volume of the carbon dioxide-acting space based on the length of the carbon dioxide absorption section;

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

[0081] Step S21: Obtain the proportion of the main producing fluid section to the length of the fracturing section, and record the proportion as the carbon dioxide absorption section proportion of the shale oil well. Based on the length of the fracturing section and the carbon dioxide absorption section proportion of the shale oil well, calculate the length of the carbon dioxide absorption section using formula (1), where formula (1) is:

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

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

[0084] Step S22: Obtain the lateral and longitudinal radius of action of carbon dioxide injection in shale oil wells, and calculate the volume of the carbon dioxide action space based on the lateral radius, longitudinal radius, length of the carbon dioxide absorption section, and formula (2). Formula (2) is:

[0085] V C =πabL g (2)

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

[0087] Step S3: Calculate the volume of the fracturing zone of the shale oil well based on the fracturing parameters, and calculate the volume of water within the carbon dioxide action area based on the volume of the carbon dioxide action space and the volume of the fracturing zone of the shale oil well;

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

[0089] Step S31: Calculate the volume of the fracturing zone in the shale oil well based on the fracturing parameters and formula (3). Formula (3) is:

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

[0091] In formula (3), V* represents the volume of the fracturing zone in a shale oil well, and L... F For the length of the fracturing section, L C For crack half length, H C For seam height;

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

[0093]

[0094] In formula (4), V CW V represents the amount of water within the effective range of carbon dioxide. F Q represents the fracturing fluid volume. W This refers to the cumulative water production.

[0095] Step S4: Calculate the volume of crude oil within the carbon dioxide's effective range based on the first data and the volume of water within the carbon dioxide's effective range, and calculate the amount of carbon dioxide used based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range.

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

[0097] Step S41: Calculate the volume of crude oil within the carbon dioxide's effective range based on formula (5), the first data, and the volume of the carbon dioxide's effective space. Formula (5) is:

[0098]

[0099] In formula (5), V CO ρ is the volume of crude oil within the range of carbon dioxide's effect. S Q represents the density of the oil reservoir shale. O The cumulative oil production before the measures, EUR is the final recoverable reserves, S1* is the free hydrocarbon content, and ρ O Density of crude oil;

[0100] Step S42: Calculate the amount of carbon dioxide used based on formula (6), the volume of crude oil within the effective range of the carbon dioxide, the first data, the volume of water within the effective range of the carbon dioxide, and the volume of crude oil within the effective range of the carbon dioxide. Formula (6) is:

[0101]

[0102] In formula (6), M C P represents the amount of carbon dioxide injected. V S is an empirical coefficient. OC S represents the carbon dioxide solubility of crude oil under reservoir conditions. WC P represents the solubility of carbon dioxide in fracturing water. V Take 0.4, and 509 in formula (6) is the standard volume 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 shale oil wells. This method can calculate the amount of carbon dioxide required for carbon dioxide huff-and-puff or carbon dioxide flooding to enhance oil production in shale oil wells based on reservoir parameters, fracturing parameters, production data, and dissolved carbon dioxide levels in the oil-water mixture. It is applicable to shale oil reservoirs. This method allows for the rapid calculation of the required carbon dioxide amount for shale oil wells, achieving scientific rigor and efficiency in calculating carbon dioxide huff-and-puff or carbon dioxide flooding, thereby improving the efficient implementation of carbon dioxide injection technology for enhancing shale oil production. It serves as a research tool for the key injection-production parameter—carbon dioxide injection rate—in shale oil wells.

[0104] A comparison of numerical simulation and empirical methods (Table 1) shows that the carbon dioxide injection volume calculated using this invention is close to the numerical simulation results. Compared to the 10-day calculation process of numerical simulation, the calculation time can be effectively shortened by 95%, improving work efficiency. Compared with the empirical method, it reduces carbon injection by 576 tons, saving gas injection volume and lowering the cost of the measure; at the same time, the initial daily oil production increase is 45.22%-84.19%, and the measure's effect 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 shale oil wells. The device includes an acquisition module 701, a first calculation module 702, a second calculation module 703, and a third calculation module 704.

[0109] Acquisition module 701 is used to acquire first data, which includes reservoir parameters, fracturing parameters, production data, and the solubility of oil and water in carbon dioxide. The reservoir parameters include reservoir temperature, pressure, crude oil density, final 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 fracturing. The solubility of oil and water in carbon dioxide includes the carbon dioxide solubility of crude oil under reservoir conditions and the carbon dioxide solubility in fracturing water.

[0110] The first calculation module 702 is used to calculate the length of the carbon dioxide absorption section based on the length of the fracturing section, and to calculate the volume of the carbon dioxide action space based on the length of the carbon dioxide absorption section.

[0111] The second calculation module 703 is used to calculate the volume of the fracturing zone of the shale oil well based on the fracturing parameters, and to calculate the volume of water within the carbon dioxide action area based on the volume of the carbon dioxide action space and the volume of the fracturing zone of the shale oil well.

[0112] The third calculation module 704 is used to calculate the volume of crude oil within the carbon dioxide's effective range based on the first data and the volume of the carbon dioxide's effective space, and to calculate the amount of carbon dioxide used based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range.

[0113] In one specific embodiment of this 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 fracturing section length occupied by the main producing fluid section, and to record the proportion as the carbon dioxide absorption section proportion of the shale oil well. Based on the fracturing section length and the carbon dioxide absorption section proportion of the shale oil well, the carbon dioxide absorption section length is calculated by formula (1), which is:

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

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

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

[0118] V C =πabL g (2)

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

[0120] In one specific embodiment of this 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 fracturing zone of the shale oil well based on the fracturing parameters and formula (3), wherein formula (3) is:

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

[0123] In formula (3), V* represents the volume of the fracturing zone in a shale oil well, and L... F For the length of the fracturing section, L C For crack half-length, H C For seam height;

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

[0125]

[0126] In formula (4), V CW V represents the amount of water within the effective range of carbon dioxide. F Q represents the fracturing fluid volume. W This refers to the cumulative water production.

[0127] In one specific embodiment of this 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's effective range based on formula (5), the first data, and the volume of the carbon dioxide's effective space. The formula (5) is:

[0129]

[0130] In formula (5), V CO ρ is the volume of crude oil within the range of carbon dioxide's effect. S Q represents the density of the oil reservoir shale. O The cumulative oil production before the measures, EUR is the final recoverable reserves, S1* is the free hydrocarbon content, and ρ O Density of crude oil;

[0131] The sixth calculation unit 7042 is used to calculate the amount of carbon dioxide used based on formula (6), the volume of crude oil within the range of carbon dioxide's effect, the first data, the volume of water within the range of carbon dioxide's effect, and the volume of crude oil within the range of carbon dioxide's effect. The formula (6) is:

[0132]

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

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

[0135] Example 3

[0136] Corresponding to the above method embodiments, this disclosure also provides a shale oil well carbon dioxide injection quantity calculation device. The shale oil well carbon dioxide injection quantity calculation device described below can be referred to in correspondence with the shale oil well carbon dioxide injection quantity calculation method described above.

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

[0138] The processor 801 controls the overall operation of the shale oil well carbon dioxide injection calculation device 800 to complete all or part of the steps in the aforementioned shale oil well carbon dioxide injection calculation method. The memory 802 stores various types of data to support the operation of the shale oil well carbon dioxide injection calculation device 800. This data may include, for example, instructions for any application or method operating on the shale oil well carbon dioxide injection calculation device 800, as well as application-related data such as contact data, sent and received messages, images, audio, video, etc. The memory 802 can be implemented using 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 storage, flash memory, magnetic disk, or optical disk. The multimedia component 803 may include a screen and an audio component. The screen may be, for example, a touchscreen, 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 signals may be further stored in the memory 802 or transmitted via the communication component 805. The audio component also includes at least one speaker for outputting audio signals. I / O interface 804 provides an interface between processor 801 and other interface modules, such as a keyboard, mouse, and buttons. These buttons can be virtual or physical. Communication component 805 is used for wired or wireless communication between the shale oil well carbon dioxide injection calculation device 800 and other devices. Wireless communication includes Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, or 4G, or a combination thereof. Therefore, the corresponding communication component 805 may include a Wi-Fi module, a Bluetooth module, and an NFC module.

[0139] In an exemplary embodiment, the shale oil well carbon dioxide injection quantity calculation device 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described shale oil well carbon dioxide injection quantity calculation method.

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

[0141] Example 4

[0142] Corresponding to the above method embodiments, this disclosure also provides a storage medium. The storage medium described below can be referred to in conjunction with the above-described method for calculating the amount of carbon dioxide injected into shale oil wells.

[0143] A storage medium storing a computer program, which, when executed by a processor, implements the steps of the shale oil well carbon dioxide injection calculation method described in the above method embodiments.

[0144] The storage medium can be any storage medium capable of storing program code, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0145] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calculating carbon dioxide injection volume in shale oil wells, characterized in that, include: The first data includes reservoir parameters, fracturing parameters, production data, and the solubility of oil and water in carbon dioxide. The reservoir parameters include reservoir temperature, pressure, crude oil density, final 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 fracturing. The solubility of oil and water in carbon dioxide includes the carbon dioxide solubility of crude oil under reservoir conditions and the carbon dioxide solubility in fracturing water. The length of the carbon dioxide absorption section is calculated based on the length of the fracturing section, and the volume of the carbon dioxide-absorbing space is calculated based on the length of the carbon dioxide absorption section. The volume of the fracturing zone in the shale oil well is calculated based on the fracturing parameters, and the volume of water within the carbon dioxide action area is calculated based on the volume of the carbon dioxide action space and the volume of the fracturing zone in the shale oil well. Based on the first data and the volume of the space where carbon dioxide acts, the volume of crude oil within the range of carbon dioxide's action is calculated. The amount of carbon dioxide used is then calculated based on the volume of crude oil within the range of carbon dioxide's action, the first data, the volume of water within the range of carbon dioxide's action, and the volume of crude oil within the range of carbon dioxide's action.

2. The method for calculating carbon dioxide injection volume in shale oil wells according to claim 1, characterized in that, The length of the carbon dioxide absorption section is calculated based on the length of the fracturing section, and the volume of the carbon dioxide-absorbing space is calculated based on the length of the carbon dioxide absorption section, including: Obtain the proportion of the main producing fluid section to the length of the fracturing section, and record the proportion as the carbon dioxide absorption section proportion of the shale oil well. Based on the length of the fracturing section and the carbon dioxide absorption section proportion of the shale oil well, calculate the length of the carbon dioxide absorption section using formula (1), which is: L g =g r *L F (1) In formula (1), L g For the length of the carbon dioxide absorption section, g r The proportion of carbon dioxide absorption section in shale oil wells, L F The length of the fracturing section; Obtain the lateral and longitudinal radius of action of carbon dioxide injection in shale oil wells, and calculate the volume of the carbon dioxide action space based on the lateral radius, longitudinal radius, length of the carbon dioxide absorption section, and formula (2). Formula (2) is: V C =πabL g (2) In formula (2), V C Let be the volume of the space where carbon dioxide acts, a be the lateral radius of action, and b be the longitudinal radius of action.

3. The method for calculating carbon dioxide injection volume in shale oil wells according to claim 2, characterized in that, The volume of the fracturing zone in the shale oil well is calculated based on the fracturing parameters, and the volume of water within the carbon dioxide field is calculated based on the volume of the carbon dioxide-affected space and the volume of the fracturing zone in the shale oil well, including: Based on the fracturing parameters and formula (3), the volume of the fracturing zone in the shale oil well is calculated. Formula (3) is as follows: V*=L C H C L F (3) In formula (3), V* represents the volume of the fracturing zone in a shale oil well, and L... F For the length of the fracturing section, L C For crack half-length, H C For seam height; The volume of water within the effective range of carbon dioxide is calculated according to formula (4), which is: In formula (4), V CW V represents the amount of water within the effective range of carbon dioxide. F Q represents the fracturing fluid volume. W This refers to the cumulative water production.

4. The method for calculating carbon dioxide injection volume in shale oil wells according to claim 3, characterized in that, Based on the first data and the volume of the space where the carbon dioxide acts, the volume of crude oil within the carbon dioxide's effective range is calculated. The amount of carbon dioxide used is then calculated based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range, including: Based on formula (5), the first data, and the volume of the space where carbon dioxide acts, the volume of crude oil within the range where carbon dioxide acts is calculated. Formula (5) is: In formula (5), V CO ρ is the volume of crude oil within the range of carbon dioxide's effect. S Q represents the density of the oil reservoir shale. O The cumulative oil production before the measures, EUR is the final recoverable reserves, S1* is the free hydrocarbon content, and ρ O Density of crude oil; The amount of carbon dioxide used is calculated based on formula (6), the volume of crude oil within the effective range of the carbon dioxide, the first data, the volume of water within the effective range of the carbon dioxide, and the volume of crude oil within the effective range of the carbon dioxide. Formula (6) is as follows: In formula (6), M C P represents the amount of carbon dioxide injected. V S is an empirical coefficient. OC S represents the carbon dioxide solubility of crude oil under reservoir conditions. WC This represents the solubility of carbon dioxide in fracturing water.

5. A device for calculating the amount of carbon dioxide injected into shale oil wells, characterized in that, include: The acquisition module is used to acquire first data, which includes reservoir parameters, fracturing parameters, production data, and the solubility of oil and water in carbon dioxide. The reservoir parameters include reservoir temperature, pressure, crude oil density, final 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 fracturing. The solubility of oil and water in carbon dioxide includes the carbon dioxide solubility of crude oil under reservoir conditions and the carbon dioxide solubility in fracturing water. The first calculation module is used to calculate the length of the carbon dioxide absorption section based on the length of the fracturing section, and to calculate the volume of the carbon dioxide action space based on the length of the carbon dioxide absorption section. The second calculation module is used to calculate the volume of the fracturing zone of the shale oil well based on the fracturing parameters, and to calculate the volume of water within the carbon dioxide action area based on the volume of the carbon dioxide action space and the volume of the fracturing zone of the shale oil well. The third calculation module is used to calculate the volume of crude oil within the carbon dioxide's effective range based on the first data and the volume of the carbon dioxide's effective space, and to calculate the amount of carbon dioxide used based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range.

6. The carbon dioxide injection calculation device for shale oil wells according to claim 5, characterized in that, The first calculation module includes: The first calculation unit is used to obtain the proportion of the main producing fluid section to the length of the fracturing section, and to record the proportion as the carbon dioxide absorption section proportion of the shale oil well. Based on the length of the fracturing section and the carbon dioxide absorption section proportion of the shale oil well, the length of the carbon dioxide absorption section is calculated by formula (1), which is: L g =g r *L F (1) In formula (1), L g For the length of the carbon dioxide absorption section, g r The proportion of carbon dioxide absorption section in shale oil wells, L F The length of the fracturing section; The second calculation unit is used to obtain the lateral and longitudinal radius of action of carbon dioxide injection in shale oil wells, and to calculate the volume of the carbon dioxide action space based on the lateral radius, longitudinal radius, length of the carbon dioxide absorption section, and formula (2), where formula (2) is: V C =πabL g (2) In formula (2), V C Let be the volume of the space where carbon dioxide acts, a be the lateral radius of action, and b be the longitudinal radius of action.

7. The carbon dioxide injection calculation device for shale oil wells according to claim 6, characterized in that, The second calculation module includes: The third calculation unit is used to calculate the volume of the fracturing zone of the shale oil well based on the fracturing parameters and formula (3), where formula (3) is: V*=L C H C L F (3) In formula (3), V* represents the volume of the fracturing zone in a shale oil well, and L... F For the length of the fracturing section, L C For crack half-length, H C For seam height; The fourth calculation unit is used to calculate the volume of water within the effective range of carbon dioxide according to formula (4), which is: In formula (4), V CW V represents the amount of water within the effective range of carbon dioxide. F Q represents the fracturing fluid volume. W This refers to the cumulative water production.

8. The carbon dioxide injection calculation device for shale oil wells according to claim 7, characterized in that, Based on the first data and the volume of the space where the carbon dioxide acts, the volume of crude oil within the carbon dioxide's effective range is calculated. The amount of carbon dioxide used is then calculated based on the volume of crude oil within the carbon dioxide's effective range, the first data, the volume of water within the carbon dioxide's effective range, and the volume of crude oil within the carbon dioxide's effective range, including: The fifth calculation unit is used to calculate the volume of crude oil within the carbon dioxide's effective range based on formula (5), the first data, and the volume of the carbon dioxide's effective space. Formula (5) is: In formula (5), V CO ρ is the volume of crude oil within the range of carbon dioxide's effect. S Q represents the density of the oil reservoir shale. O The cumulative oil production before the measures, EUR is the final recoverable reserves, S1* is the free hydrocarbon content, and ρ O Density of crude oil; The sixth calculation unit is used to calculate the amount of carbon dioxide used based on formula (6), the volume of crude oil within the effective range of the carbon dioxide, the first data, the volume of water within the effective range of the carbon dioxide, and the volume of crude oil within the effective range of the carbon dioxide. The formula (6) is: In formula (6), M C P represents the amount of carbon dioxide injected. V S is an empirical coefficient. OC S represents the carbon dioxide solubility of crude oil under reservoir conditions. WC This represents the solubility of carbon dioxide in fracturing water.

9. A device for calculating carbon dioxide injection volume in shale oil wells, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the method for calculating the amount of carbon dioxide injected into a shale oil well as described in any one of claims 1 to 4.

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 shale oil wells as described in any one of claims 1 to 4.

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