Calculation method for carbon emission in fracturing operation scene

Abstract

The invention discloses a method for calculating carbon emission in a fracturing operation scene, which belongs to the technical field of oil and gas exploitation fracturing operation, and is characterized by comprising the following steps of: a, calculating the carbon emission of a fracturing truck group; b, calculating the fuel consumption of the diesel generator for the field auxiliary facility through a formula 1; c, calculating the carbon emission generated in the transportation process of the materials used on site through a formula 2; and d, calculating the total carbon emission amount of the fracturing operation scene through a formula 3. According to the method, the greenhouse gas emission amount of the fracturing truck with the carbon dioxide equivalent as the result in the fracturing operation process can be accurately obtained in real time, and the greenhouse gas emission amount of the fracturing operation can be managed and controlled more conveniently and accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing operations in oil and gas production, and particularly to a method for calculating carbon emissions in a fracturing operation scenario. Background Art

[0002] Fracturing operation refers to a method of forming fractures in oil and gas reservoirs by using hydraulic action during oil or gas production. Currently, fracturing operation is one of the main ways to increase the production of oil and gas wells. Currently, the main means of fracturing is to use a diesel fracturing truck fleet to provide power and inject high-pressure fluid of 60 - 140 MPa into the formation. Hydraulic fracturing relies on a ground high-pressure pump truck fleet to inject fluid into the well at high speed. With the high pressure built up at the bottom of the well, the oil reservoir rock fractures to generate fractures. To prevent the fractures from closing automatically after the pump truck stops working and the pressure drops, sand several times denser than the formation density is mixed into the injected liquid after the formation fractures. The sand enters the fractures together with the fluid and stays in the fractures permanently to support the fractures in an open state, thus improving the oil flow environment for a long time. Fracturing operations are characterized by being super-large-scale, high-energy-consuming, and high-material-consuming, and the greenhouse gas emissions generated account for a quite large proportion in the oil and gas production industry.

[0003] As the main link in the generation of greenhouse gases during oil and gas field exploitation, due to the large number of personnel involved in fracturing operations and the large number of equipment and facilities equipped, and the greenhouse gas emissions during the operation being affected by temperature, there is currently no method that can relatively accurately provide a calculation method for the carbon emissions of fracturing operations.

[0004] Chinese patent document with publication number CN112070331A and publication date December 11, 2020 discloses a method for evaluating greenhouse gas emissions during unconventional oil and gas development, characterized in that the method includes:

[0005] Dividing the whole life cycle of unconventional oil and gas development into at least one engineering stage, and the at least one engineering stage includes a pre-drilling engineering stage, a drilling engineering stage, a cementing engineering stage, a hydraulic fracturing stage, and a well completion engineering stage;

[0006] Respectively determining the greenhouse gas emission sources in each engineering stage, and determining the greenhouse gas emissions in each engineering stage according to the greenhouse gas emission sources. Among them, the greenhouse gas emission sources in the pre-drilling engineering stage, the drilling engineering stage, the cementing engineering stage, and the hydraulic fracturing stage include the greenhouse gases emitted when power equipment is used; the greenhouse gas emission source in the well completion engineering stage includes the greenhouse gases discharged during the blowout test at well completion;

[0007] Accumulating the greenhouse gas emissions in all engineering stages to obtain the greenhouse gas emissions during unconventional oil and gas development.

[0008] The method for evaluating greenhouse gas emissions in the process of unconventional oil and gas development disclosed in this patent document can systematically evaluate the greenhouse gas emissions in the entire life cycle of the unconventional oil and gas development process, providing a basis for further controlling and adjusting the greenhouse gas emissions. However, it is only limited to the evaluation of greenhouse gas emissions from unconventional oil and gas extraction, and only calculates the direct carbon emissions generated by the transportation of major energy equipment and materials. Therefore, it cannot accurately obtain the greenhouse gas emissions of the fracturing truck in real time, which is not conducive to the control of greenhouse gas emissions from fracturing operations. Summary of the Invention

[0009] In order to overcome the above-mentioned defects of the prior art, the present invention provides a method for calculating the carbon emissions in a fracturing operation scenario. The present invention can accurately obtain the greenhouse gas emissions of the fracturing truck in terms of carbon dioxide equivalent in real time during the fracturing operation process, which is conducive to more convenient and accurate control of greenhouse gas emissions from fracturing operations.

[0010] The present invention is realized through the following technical solutions:

[0011] A method for calculating the carbon emissions in a fracturing operation scenario, characterized by including the following steps:

[0012] a. Calculate the carbon emissions of the fracturing truck fleet;

[0013] b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1;

[0014] E2 = D 柴油 ×0.317 eCO2kg / kg Equation 1

[0015] wherein, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, D 柴油 is the diesel consumption, and 0.317 eCO2kg / kg is the fuel consumption calculation parameter of the diesel generator;

[0016] c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2;

[0017] E3 = 2×D 燃料 ×d 距离 ×β Equation 2

[0018] wherein, E3 is the carbon emissions generated during the transportation of on-site used materials, D 燃料 is the fuel consumption during transportation, d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation;

[0019] d. Calculate the total carbon emissions of the fracturing operation scenario through Equation 3;

[0020] E 总= E1 + E2 + E3 Equation 3

[0021] Where, E 总 is the total carbon emissions of the fracturing operation scenario.

[0022] In step b, the diesel consumption D 柴油 is determined by calculation through Equation 4;

[0023] D 柴油 = D0 - D T Equation 4

[0024] Where, D0 is the initial diesel quantity, and D T is the remaining diesel quantity.

[0025] In step c, the carbon emission coefficient of the transportation process is determined by the maximum emission value in the vehicle exhaust emissions.

[0026] In step c, the fuel consumption during transportation is statistically determined through the fuel consumption records during use.

[0027] Step a specifically includes:

[0028] S1. Determine the carbon emission coefficients of the fracturing trucks under different maximum working pressures, maximum discharge flows, and rated powers;

[0029] S2. Obtain the diesel consumptions of fracturing trucks of different models and different years;

[0030] S3. Analyze the exhaust gas components of fracturing trucks of different models and different years, and combine the diesel consumptions of the fracturing trucks to obtain the relationship between the carbon emissions and the years;

[0031] S4. Calculate the carbon emissions of the fracturing truck fleet through Equation 5;

[0032] E1 = α∑D n Equation 5

[0033] Where, E1 is the carbon emissions of the fracturing truck fleet, α is the influence coefficient of the operating environment on the carbon emissions, and D n is the carbon dioxide equivalent generated per unit time by the fracturing truck.

[0034] In step S1, the carbon emission coefficient of the fracturing truck is specifically determined by collecting the diesel consumptions under different working pressures, discharge flows, and rated powers per unit time, and collecting and analyzing the exhaust gas components of the fracturing truck.

[0035] Step S2 specifically includes:

[0036] S21. Detect the liquid level depth of the oil in the fuel tank through ultrasonic detection and calculate through Equation 6;

[0037] h = θ × t ÷ 2 Equation 6

[0038] Where h is the liquid level depth of the fuel quantity in the fuel tank, θ is the sound velocity value of diesel, and t is the time for the ultrasonic wave to return;

[0039] S22. Obtain the integral equation of the liquid level depth and the fuel quantity in the fuel tank through fitting, and calculate the diesel consumption.

[0040] The step S3 specifically includes:

[0041] S31. Select CO2, CH4, and NO X as the analysis parameters for the tail gas components of the fracturing truck;

[0042] S32. Conduct on-line monitoring of the tail gas of the fracturing truck, collect the tail gas, and determine the true value of the collected tail gas through laboratory testing as the correction of the on-line monitoring result;

[0043] S33. Determine the corresponding relationship between the on-line monitoring and the true value of the laboratory test, and detect and determine the tail gas components corresponding to different working conditions and the same fuel consumption;

[0044] S34. Calculate the carbon dioxide equivalent corresponding to the emissions of different greenhouse gases through Equation 7;

[0045]

[0046] Where eCO2 is the carbon dioxide equivalent, is the global warming potential of methane, is the global warming potential of nitrogen oxide.

[0047] In the step S4, the carbon dioxide equivalent generated by the fracturing truck per unit time is calculated through Equation 8;

[0048] D n = (V × α) × eCO2 Equation 8

[0049] Where α is the carbon emission coefficient of the diesel used in the fracturing operation.

[0050] In the step S4, the influence coefficient of the operating environment on the carbon emission is corrected according to the temperature. The value is 1.02 when the temperature is 0 - 10 °C, 1 when the temperature is 10 - 40 °C, and 1.01 when the temperature is above 40 °C.

[0051] The beneficial effects of the present invention are mainly manifested in the following aspects:

[0052] 1. The present invention can accurately obtain the greenhouse gas emissions of the fracturing truck in terms of carbon dioxide equivalent in real time during the fracturing operation, which is conducive to more convenient and accurate control of the greenhouse gas emissions of the fracturing operation.

[0053] 2. Compared with the prior art, during the fracturing operation, the fuel consumption of the diesel generator for on-site auxiliary facilities and the carbon emissions generated during the transportation of on-site used materials are fully considered, ensuring the calculation accuracy of the carbon emissions in the fracturing operation scenario.

[0054] 3. In the present invention, CO2, CH4 and NO X are selected as the analysis parameters for the exhaust gas components of the fracturing truck. The calculated greenhouse gases include N2O, and the analysis parameters for the exhaust gas components of the fracturing truck are more comprehensive, further improving the calculation accuracy of the carbon emissions.

[0055] 4. In the present invention, the specific calculation method is determined based on the greenhouse gas emission calculation data of more than 20 existing fracturing operation scenarios. Among them, the carbon emissions generated by the fracturing truck during the fracturing operation are the main emission source, accounting for about 90%, and the carbon emissions during the transportation of materials account for about 5 - 8%. With a large amount of actual data as support, the calculation is scientific and reasonable.

[0056] 5. In the present invention, compared with the prior art, the diesel consumption is indirectly obtained through the original data in the account books and records, and the data authenticity and accuracy are higher in terms of data quality.

[0057] 6. In the present invention, considering the different carbon emissions of fracturing trucks with different powers, displacements and working years during the actual production process, it is beneficial to improve the calculation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The present invention will be further specifically described below in conjunction with the specification drawings and specific embodiments:

[0059] Figure 1 It is a flow block diagram of the present invention. SPECIFIC EMBODIMENTS

[0060] Example 1

[0061] Refer to Figure 1 , a method for calculating the carbon emissions of a fracturing operation scenario, including the following steps:

[0062] a. Calculate the carbon emissions of the fracturing truck group;

[0063] b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1;

[0064] E2 = D 柴油 ×0.317eCO2kg / kg Equation 1

[0065] Wherein, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, D 柴油is the diesel consumption, and 0.317eCO2kg / kg is the fuel consumption calculation parameter of the diesel generator;

[0066] c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2;

[0067] E3 = 2 × D 燃料 × d 距离 × β Equation 2

[0068] Wherein, E3 is the carbon emissions generated during the transportation of on-site used materials, D 燃料 is the fuel consumption during transportation, d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation;

[0069] d. Calculate the total carbon emissions of the fracturing operation scenario through Equation 3;

[0070] E 总 = E1 + E2 + E3 Equation 3

[0071] Wherein, E 总 is the total carbon emissions of the fracturing operation scenario.

[0072] This embodiment is the most basic implementation method, which can accurately obtain the greenhouse gas emissions of the fracturing truck in terms of carbon dioxide equivalent in real time during the fracturing operation, facilitating more convenient and accurate control of the greenhouse gas emissions of the fracturing operation.

[0073] Embodiment 2

[0074] See Figure 1 , a method for calculating the carbon emissions of a fracturing operation scenario, including the following steps:

[0075] a. Calculate the carbon emissions of the fracturing truck group;

[0076] b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1;

[0077] E2 = D 柴油 × 0.317eCO2kg / kg Equation 1

[0078] Wherein, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, D 柴油 is the diesel consumption, and 0.317eCO2kg / kg is the fuel consumption calculation parameter of the diesel generator;

[0079] c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2;

[0080] E3 = 2 × D 燃料 × d 距离 × β Equation 2

[0081] Among them, E3 is the carbon emission generated during the transportation of on-site used materials, and D 燃料 is the fuel consumption during transportation, and d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation;

[0082] d. Calculate the total carbon emission of the fracturing operation scenario through Equation 3;

[0083] E 总 = E1 + E2 + E3 Equation 3

[0084] Among them, E 总 is the total carbon emission of the fracturing operation scenario.

[0085] Furthermore, in step b, the diesel consumption D 柴油 is determined by calculating through Equation 4;

[0086] D 柴油 = D0 - D T Equation 4

[0087] Among them, D0 is the initial diesel quantity, and D T is the remaining diesel quantity.

[0088] In step c, the carbon emission coefficient during transportation is determined by the maximum emission value in vehicle exhaust emissions.

[0089] In step c, the fuel consumption during transportation is statistically determined through the fuel consumption records during use.

[0090] This embodiment is a preferred embodiment. Compared with the prior art, during the fracturing operation process, the fuel consumption of the diesel generator for on-site auxiliary facilities and the carbon emissions generated during the transportation of on-site used materials are fully considered, ensuring the calculation accuracy of the carbon emissions in the fracturing operation scenario.

[0091] Embodiment 3

[0092] See Figure 1 , a method for calculating the carbon emissions of a fracturing operation scenario, including the following steps:

[0093] a. Calculate the carbon emissions of the fracturing fleet;

[0094] b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1;

[0095] E2 = D 柴油 × 0.317 eCO2kg / kg Equation 1

[0096] Among them, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, D 柴油 is the diesel consumption, and 0.317 eCO2kg / kg is the fuel consumption calculation parameter of the diesel generator;

[0097] c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2;

[0098] E3 = 2 × D 燃料 × d 距离 × β Equation 2

[0099] Among them, E3 is the carbon emissions generated during the transportation of on-site used materials, D 燃料 is the fuel consumption during transportation, d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation;

[0100] d. Calculate the total carbon emissions of the fracturing operation scenario through Equation 3;

[0101] E 总 = E1 + E2 + E3 Equation 3

[0102] Among them, E 总 is the total carbon emissions of the fracturing operation scenario.

[0103] In the said step b, the diesel consumption D 柴油 is determined through Equation 4;

[0104] D 柴油 = D0 - D T Equation 4

[0105] Among them, D0 is the initial diesel quantity, and D T is the remaining diesel quantity.

[0106] In the said step c, the carbon emission coefficient during transportation is determined through the maximum emission value in vehicle exhaust emissions.

[0107] In the said step c, the fuel consumption during transportation is statistically determined through the fuel consumption records during use.

[0108] Furthermore, the said step a specifically includes:

[0109] S1. Determine the carbon emission coefficients of fracturing trucks under different maximum working pressures, maximum discharge flows, and rated powers;

[0110] S2. Obtain the diesel consumption of fracturing trucks of different models and different years;

[0111] S3. Analyze the exhaust gas components of fracturing trucks of different models and different years, and combine the diesel consumption of fracturing trucks to obtain the relationship between carbon emissions and years;

[0112] S4. Calculate the carbon emissions of the fracturing fleet through Equation 5;

[0113] E1 = α∑D n Equation 5

[0114] Wherein, E1 is the carbon emissions of the fracturing fleet, α is the influence coefficient of the operating environment on carbon emissions, and D n is the carbon dioxide equivalent generated by the fracturing vehicle per unit time.

[0115] This embodiment is another preferred embodiment. CO2, CH4, and NO are selected X as the analysis parameters for the exhaust gas components of the fracturing vehicle. The calculated greenhouse gases include N2O, and the analysis parameters for the exhaust gas components of the fracturing vehicle are more comprehensive, further improving the calculation accuracy of carbon emissions.

[0116] Embodiment 4

[0117] Refer to Figure 1 , a method for calculating the carbon emissions of a fracturing operation scenario, comprising the following steps:

[0118] a. Calculate the carbon emissions of the fracturing fleet;

[0119] b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1;

[0120] E2 = D 柴油 × 0.317 eCO2 kg / kg Equation 1

[0121] Wherein, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, and D 柴油 is the diesel consumption, and 0.317 eCO2 kg / kg is the fuel consumption calculation parameter of the diesel generator;

[0122] c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2;

[0123] E3 = 2 × D 燃料 × d 距离 × β Equation 2

[0124] Wherein, E3 is the carbon emissions generated during the transportation of on-site used materials, and D 燃料 is the fuel consumption during transportation, d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation;

[0125] d. Calculate the total carbon emissions of the fracturing operation scenario through Equation 3;

[0126] E 总 = E1 + E2 + E3 Equation 3

[0127] Among them, E 总 is the total carbon emissions of the fracturing operation scenario.

[0128] In step b, the diesel consumption D 柴油 is determined by calculation through Equation 4;

[0129] D 柴油 = D0 - D T Equation 4

[0130] Among them, D0 is the initial diesel quantity, and D T is the remaining diesel quantity.

[0131] In step c, the carbon emission coefficient during the transportation process is determined by the maximum emission value in the vehicle exhaust emissions.

[0132] In step c, the fuel consumption during the transportation process is statistically determined through the fuel consumption records during use.

[0133] Step a specifically includes:

[0134] S1. Determine the carbon emission coefficients of fracturing trucks under different maximum working pressures, maximum discharge flows, and rated powers;

[0135] S2. Obtain the diesel consumptions of fracturing trucks of different models and different years;

[0136] S3. Analyze the exhaust gas components of fracturing trucks of different models and different years, and combine the diesel consumptions of fracturing trucks to obtain the relationship between carbon emissions and years;

[0137] S4. Calculate the carbon emissions of the fracturing truck fleet through Equation 5;

[0138] E1 = α∑D n Equation 5

[0139] Among them, E1 is the carbon emissions of the fracturing truck fleet, α is the influence coefficient of the operating environment on carbon emissions, and D n is the carbon dioxide equivalent generated by the fracturing truck per unit time.

[0140] In step S1, the carbon emission coefficient of the fracturing truck is specifically determined by collecting the diesel consumption under different working pressures, discharge flows, and rated powers per unit time, and collecting and analyzing the exhaust gas components of the fracturing truck.

[0141] Step S2 specifically includes:

[0142] S21. Detect the liquid level depth of the oil in the fuel tank through ultrasonic detection, and calculate through Equation 6;

[0143] h = θ×t÷2 Equation 6

[0144] Among them, h is the liquid level depth of the oil quantity in the fuel tank, θ is the sound velocity value of diesel, and t is the time for the ultrasonic wave to return.

[0145] S22. Obtain the integral equation of the liquid level depth and the oil quantity in the fuel tank through fitting, and calculate the diesel consumption.

[0146] This embodiment is another preferred embodiment. The specific calculation method is determined based on the greenhouse gas emission calculation data of more than 20 existing fracturing operation scenarios. Among them, the carbon emissions generated by the fracturing trucks during the fracturing operation are the main emission sources, accounting for about 90%. The carbon emissions during the transportation of materials account for about 5 - 8%. There is a large amount of actual data as support, and the calculation is scientific and reasonable.

[0147] Embodiment 5

[0148] See Figure 1 , a method for calculating the carbon emissions of a fracturing operation scenario, including the following steps:

[0149] a. Calculate the carbon emissions of the fracturing truck fleet;

[0150] b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1;

[0151] E2 = D 柴油 ×0.317 eCO2kg / kg Equation 1

[0152] Among them, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, D 柴油 is the diesel consumption, and 0.317 eCO2kg / kg is the fuel consumption calculation parameter of the diesel generator;

[0153] c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2;

[0154] E3 = 2 × D 燃料 ×d 距离 ×β Equation 2

[0155] Among them, E3 is the carbon emissions generated during the transportation of on-site used materials, D 燃料 is the fuel consumption during transportation, d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation;

[0156] d. Calculate the total carbon emissions of the fracturing operation scenario through Equation 3;

[0157] E 总 = E1 + E2 + E3 Equation 3

[0158] Among them, E 总Is the total carbon emissions in the fracturing operation scenario.

[0159] In step b, the diesel consumption D 柴油 Is determined by calculation through Equation 4;

[0160] D 柴油 = D0 - D T Equation 4

[0161] Wherein, D0 is the initial diesel quantity, and D T Is the remaining diesel quantity.

[0162] In step c, the carbon emission coefficient during the transportation process is determined by the maximum emission value in the vehicle exhaust emissions.

[0163] In step c, the fuel consumption during the transportation process is statistically determined through the fuel consumption records during use.

[0164] Step a specifically includes:

[0165] S1. Determine the carbon emission coefficient of the fracturing truck under different maximum working pressures, maximum discharge flows and rated powers;

[0166] S2. Obtain the diesel consumption of fracturing trucks of different models and different years;

[0167] S3. Analyze the exhaust gas components of fracturing trucks of different models and different years, and combine the diesel consumption of the fracturing trucks to obtain the relationship between the carbon emissions and the years;

[0168] S4. Calculate the carbon emissions of the fracturing truck group through Equation 5;

[0169] E1 = α∑D n Equation 5

[0170] Wherein, E1 is the carbon emissions of the fracturing truck group, α is the influence coefficient of the carbon emissions based on the operation environment, and D n Is the carbon dioxide equivalent generated by the fracturing truck per unit time.

[0171] In step S1, the carbon emission coefficient of the fracturing truck is specifically determined by collecting the diesel consumption under different working pressures, discharge flows and rated powers per unit time, and collecting and analyzing the exhaust gas components of the fracturing truck.

[0172] Step S2 specifically includes:

[0173] S21. Detect the liquid level depth of the oil in the fuel tank through ultrasonic detection, and calculate through Equation 6;

[0174] h = θ×t÷2 Equation 6

[0175] Among them, h is the liquid level depth of the fuel in the fuel tank, θ is the sound velocity value of diesel, and t is the time for the ultrasonic wave to return;

[0176] S22. Obtain the integral equation of the liquid level depth and the fuel quantity in the fuel tank by fitting, and calculate the diesel consumption.

[0177] Furthermore, the step S3 specifically includes:

[0178] S31. Select CO2, CH4, and NO X as the analysis parameters for the tail gas components of the fracturing truck;

[0179] S32. Conduct on-line monitoring of the tail gas of the fracturing truck, collect the tail gas, and determine the true value of the collected tail gas through laboratory measurement as the correction of the on-line monitoring result;

[0180] S33. Determine the corresponding relationship between the on-line monitoring and the true value of the laboratory detection, and detect and determine the tail gas components corresponding to the same fuel consumption under different working conditions;

[0181] S34. Calculate the carbon dioxide equivalent corresponding to the emissions of different greenhouse gases through Equation 7;

[0182]

[0183] Among them, eCO2 is the carbon dioxide equivalent, is the global warming potential of methane, is the global warming potential of nitrogen oxide.

[0184] This embodiment is another preferred embodiment. Compared with the prior art, the diesel consumption is indirectly obtained through the original data in the account books and records, and the data authenticity and accuracy are higher for the data quality.

[0185] Embodiment 6

[0186] See Figure 1 , a method for calculating the carbon emissions of a fracturing operation scenario, including the following steps:

[0187] a. Calculate the carbon emissions of the fracturing truck group;

[0188] b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1;

[0189] E2 = D 柴油 ×0.317 eCO2 kg / kg Equation 1

[0190] Among them, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, D 柴油 is the diesel consumption, and 0.317 eCO2 kg / kg is the fuel consumption calculation parameter of the diesel generator;

[0191] c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2;

[0192] E3 = 2 × D 燃料 × d 距离 × β Equation 2

[0193] Wherein, E3 is the carbon emissions generated during the transportation of on-site used materials, D 燃料 is the fuel consumption during transportation, d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation;

[0194] d. Calculate the total carbon emissions of the fracturing operation scenario through Equation 3;

[0195] E 总 = E1 + E2 + E3 Equation 3

[0196] Wherein, E 总 is the total carbon emissions of the fracturing operation scenario.

[0197] In step b, the diesel consumption D 柴油 is determined by calculating through Equation 4;

[0198] D 柴油 = D0 - D T Equation 4

[0199] Wherein, D0 is the initial diesel quantity, and D T is the remaining diesel quantity.

[0200] In step c, the carbon emission coefficient during transportation is determined by the maximum emission value in vehicle exhaust emissions.

[0201] In step c, the fuel consumption during transportation is statistically determined through the fuel consumption records during use.

[0202] Step a specifically includes:

[0203] S1. Determine the carbon emission coefficients of fracturing trucks under different maximum working pressures, maximum discharge flows, and rated powers;

[0204] S2. Obtain the diesel consumption of fracturing trucks of different models and different years;

[0205] S3. Analyze the exhaust gas components of fracturing trucks of different models and different years, and combine the diesel consumption of fracturing trucks to obtain the relationship between carbon emissions and years;

[0206] S4. Calculate the carbon emissions of the fracturing truck fleet through Equation 5;

[0207] E1 = α∑D n Equation 5

[0208] Among them, E1 is the carbon emission of the fracturing fleet, α is the influence coefficient of the carbon emission based on the operating environment, and D n is the carbon dioxide equivalent generated by the fracturing vehicle per unit time.

[0209] In the step S1, the carbon emission coefficient of the fracturing vehicle is specifically determined by collecting the diesel consumption under different working pressures, discharge flows, and rated powers per unit time, and collecting and analyzing the components of the exhaust gas of the fracturing vehicle.

[0210] The step S2 specifically includes:

[0211] S21. Detect the liquid level depth of the oil quantity in the fuel tank through ultrasonic detection and calculate it by Equation 6;

[0212] h = θ × t ÷ 2 Equation 6

[0213] Among them, h is the liquid level depth of the oil quantity in the fuel tank, θ is the sound velocity value of diesel, and t is the time for the ultrasonic wave to return;

[0214] S22. Obtain the integral equation of the liquid level depth and the oil quantity in the fuel tank through fitting and calculate the diesel consumption.

[0215] The step S3 specifically includes:

[0216] S31. Select CO2, CH4, and NO X as the analysis parameters for the components of the exhaust gas of the fracturing vehicle;

[0217] S32. Conduct on-line monitoring of the exhaust gas of the fracturing vehicle and collect the exhaust gas. The collected exhaust gas is determined by the laboratory to obtain the true value, which is used as the correction of the on-line monitoring result;

[0218] S33. Determine the corresponding relationship between the on-line monitoring and the true value detected by the laboratory, and detect and determine the exhaust gas components corresponding to the same fuel consumption under different working conditions;

[0219] S34. Convert the carbon dioxide equivalent corresponding to the emissions of different greenhouse gases by Equation 7;

[0220]

[0221] Among them, eCO2 is the carbon dioxide equivalent, is the global warming potential of methane, is the global warming potential of nitrogen oxide.

[0222] In the step S4, the carbon dioxide equivalent generated by the fracturing vehicle per unit time is calculated by Equation 8;

[0223] D n = (V × α) × eCO2 Equation 8

[0224] Among them, α is the carbon emission coefficient of diesel oil used in the fracturing operation.

[0225] In the step S4, the influence coefficient of the operating environment on the carbon emission is corrected according to the temperature. When the temperature is 0 - 10 °C, the value is 1.02; when the temperature is 10 - 40 °C, the value is 1; when the temperature is above 40 °C, the value is 1.01.

[0226] This embodiment is the best implementation mode. Considering the different carbon emissions of fracturing trucks with different powers, displacements and working years in the actual production process, it is beneficial to improve the calculation accuracy.

[0227] The calculation principle of the model of the present invention is as follows:

[0228] The calculation boundary of greenhouse gases in the fracturing operation scenario is mainly: carbon emissions during the transportation of used materials, carbon emissions generated by the fracturing truck during the fracturing operation, and carbon emissions generated by the operation of the diesel generator for maintaining other auxiliary operations. Among them, the carbon emissions generated by the fracturing truck during the fracturing operation are the main emission source, accounting for about 90%; the carbon emissions during the transportation of materials account for about 5 - 8%; using the statistical data and the maximum emission value in the vehicle emission standards has little impact on the calculation results; while the auxiliary power generation equipment used on site is owned by the site, and during the process of parameter fitting, multiple data can be measured at one time, and the calculation method and the parameter fitting method are the same, and the fitting calculation is more convenient.

Claims

1. A method for calculating carbon emissions in a fracturing operation scenario, characterized in that, It includes the following steps: a. Calculate the carbon emissions of the fracturing truck fleet; b. Calculate the fuel consumption of the diesel generator for on-site auxiliary facilities through Equation 1; E2 = D 柴油 × 0.317 eCO2 kg / kg Equation 1 Among them, E2 is the fuel consumption of the diesel generator for on-site auxiliary facilities, D 柴油 is the diesel consumption, and 0.317eCO2kg / kg is the fuel consumption calculation parameter of the diesel generator; c. Calculate the carbon emissions generated during the transportation of on-site used materials through Equation 2; E3 = 2 × D 燃料 × d 距离 × β Equation 2 Among them, E3 is the carbon emission generated during the transportation of on-site used materials, D 燃料 is the fuel consumption during transportation, d 距离 is the transportation distance, and β is the carbon emission coefficient during transportation; d. Calculate the total carbon emissions of the fracturing operation scenario through Equation 3; E 总 = E1 + E2 + E3 Equation 3 Among them, E 总 is the total carbon emissions of the fracturing operation scenario.

2. The method for calculating carbon emissions in a fracturing operation scenario according to claim 1, characterized in that: In step b, the diesel consumption D 柴油 is determined by calculation according to Equation 4; D 柴油 = D0 - D T Equation 4 Among them, D0 is the initial diesel fuel quantity, and D T is the remaining diesel fuel quantity.

3. The method for calculating carbon emissions in a fracturing operation scenario according to claim 1, characterized in that: In step c, the carbon emission coefficient during transportation is determined by the maximum emission value in vehicle exhaust emissions.

4. The method for calculating carbon emissions in a fracturing operation scenario according to claim 1, characterized in that: In step c, the fuel consumption during transportation is statistically determined through the fuel consumption records during use.

5. The method for calculating carbon emissions in a fracturing operation scenario according to claim 1, characterized in that: Step a specifically includes: S1. Determine the carbon emission coefficients of fracturing trucks under different maximum working pressures, maximum discharge flows, and rated powers; S2. Obtain the diesel consumption of fracturing trucks of different models and ages; S3. Analyze the exhaust gas components of fracturing trucks of different models and ages, and combine the diesel consumption of fracturing trucks to obtain the relationship between carbon emissions and age; S4. Calculate the carbon emissions of the fracturing truck fleet through Equation 5; E1 = α∑D n Equation 5 Among them, E1 is the carbon emissions of the fracturing fleet, α is the influence coefficient of the carbon emissions based on the operating environment, and D n is the carbon dioxide equivalent generated by the fracturing truck per unit time.

6. The method for calculating carbon emissions in a fracturing operation scenario according to claim 5, characterized in that: In step S1, the carbon emission coefficient of the fracturing truck is specifically determined by collecting the diesel consumption under different working pressures, discharge flows, and rated powers per unit time, and collecting and analyzing the exhaust gas components of the fracturing truck.

7. The method for calculating carbon emissions in a fracturing operation scenario according to claim 5, characterized in that: Step S2 specifically includes: S21. Calculate the liquid level depth of the oil in the fuel tank through ultrasonic detection, using Equation 6; h = θ × t ÷ 2 Equation 6 where h is the liquid level depth of the oil in the fuel tank, θ is the sound velocity value of diesel, and t is the time for ultrasonic wave return; S22. Calculate the fuel consumption by fitting the integral equation of the liquid level depth and the oil volume in the fuel tank.

8. A method for calculating carbon emissions in a fracturing operation scenario according to claim 5, characterized in that: Step S3 specifically includes: S31. Select CO2, CH4 and NO X as the analysis parameters for the exhaust gas components of the fracturing truck; S32. Conduct on-line monitoring of the exhaust gas of the fracturing truck, collect the exhaust gas, and determine the true value of the collected exhaust gas through laboratory testing as the correction of the on-line monitoring result; S33. Determine the corresponding relationship between on-line monitoring and the true value of laboratory testing, and detect and determine the exhaust gas components corresponding to the same fuel consumption under different working conditions; S34. Convert the carbon dioxide equivalents corresponding to different greenhouse gas emissions through Equation 7; where eCO2 is the carbon dioxide equivalent, is the global warming potential of methane, is the global warming potential of nitrous oxide.

9. A method for calculating carbon emissions in a fracturing operation scenario according to claim 5, characterized in that: In step S4, the carbon dioxide equivalent generated by the fracturing truck per unit time is calculated through Equation 8; D n = (V × α) × eCO2 Equation 8 where α is the carbon emission coefficient of the diesel used in the fracturing operation.

10. A method for calculating carbon emissions in a fracturing operation scenario according to claim 5, characterized in that: In step S4, the influence coefficient of the operating environment on carbon emissions is corrected according to the temperature. When the temperature is 0 - 10 °C, the value is 1.02; when the temperature is 10 - 40 °C, the value is 1; when the temperature is above 40 °C, the value is 1.01.

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