CCUS-EOR carbon emission reduction accounting method and device, computer equipment and storage medium

Abstract

The invention relates to a CCUS-EOR carbon emission reduction accounting method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring a boundary of a project; confirming a carbon dioxide emission source contained in the boundary; identifying a datum line scene of the item; calculating the carbon emission generated by the datum line scene; calculating carbon emission generated by the project activity according to the boundary and the carbon dioxide emission source included in the boundary; and calculating carbon emission reduction according to the carbon emission generated by the project and the carbon emission generated by the datum line scene. According to the CCUS-EOR carbon emission reduction accounting method, carbon dioxide amount accounting based on CCER carbon voluntary emission reduction CCUS-EOR project can be realized according to the carbon dioxide flooding and sequestered carbon emission reduction accounting model under the current situation of lack of carbon emission responsibility accounting aiming at the carbon sequestration accounting and transaction requirements of the project.

Description

Technical Field

[0001] The present invention relates to the field of carbon emission technology, and in particular to a method, device, computer equipment and storage medium for calculating carbon emission reductions of CCUS-EOR. Background Art

[0002] Carbon dioxide capture and oil recovery storage (CCUS-EOR) is one of the most effective ways to reduce carbon emissions at present. 2 , and can increase oil production, which is currently the most feasible technical means to achieve low-carbon utilization of fossil energy. There is huge room for stabilizing carbon prices and promoting the full flow of carbon factors in the carbon market.

[0003] The accounting of carbon emissions is the basis for trading. Today, there are basic methods for calculating carbon emissions, which provide general framework principles for the accounting of emission reductions from CCUS capture, transportation, injection and storage. Canada, Australia, Finland and other countries have given preliminary calculation methods for emissions for CCS, but have not formed a complete CCUS methodology. At present, there is no carbon dioxide capture and oil recovery storage methodology in China, and there is no effective accounting method. At present, there is an urgent need to effectively calculate the amount of carbon dioxide stored in the process of carbon dioxide capture and oil recovery, and to form a methodological support for the assessment of carbon emission responsibilities and the issuance of carbon credits. Summary of the invention

[0004] Based on this, it is necessary to provide CCUS-EOR carbon emission reduction accounting methods, devices, computer equipment and storage media.

[0005] A CCUS-EOR carbon emission reduction accounting method comprises the following steps:

[0006] Get the bounds of the item;

[0007] Identify the sources of CO2 emissions contained within the stated boundary;

[0008] Identify the baseline scenario for the project;

[0009] Calculate the carbon emissions resulting from the baseline scenario;

[0010] Calculate the carbon emissions generated by the project activity based on the boundary and the carbon dioxide emission sources included in the boundary; and

[0011] The carbon emission reduction is calculated based on the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario.

[0012] The above CCUS-EOR carbon emission reduction accounting method can be used to meet the carbon storage verification and trading needs of the project. In the absence of carbon emission responsibility verification, it can realize the accounting of carbon dioxide emissions reduced by CCUS-EOR projects based on CCER voluntary carbon emission reductions according to the carbon dioxide recovery and storage carbon emission reduction accounting model.

[0013] In one embodiment, the boundary includes: at least one of: carbon dioxide exhaust emission points of energy and industrial facilities, carbon dioxide capture systems, carbon dioxide transportation systems, carbon dioxide injection systems, crude oil lifting systems, oil and gas gathering and transportation systems, carbon dioxide oil recovery storage areas and carbon dioxide geological escape monitoring boundaries.

[0014] By obtaining the boundaries of the above-mentioned projects, the subsequent carbon emissions can be calculated based on the boundaries.

[0015] In one embodiment, the carbon dioxide emission sources include at least one of steam and electricity consumption during capture, fossil fuel fuel and electricity consumption during transportation, electricity consumption during injection, electricity consumption generated during crude oil lifting, fossil fuel combustion and electricity consumption during oil and gas gathering and transportation, escape during reinjection gas transportation, organized venting during operation, carbon dioxide carried by external transmission media during carbon dioxide oil recovery, and electricity consumed for produced gas reinjection.

[0016] Identifying the sources of carbon dioxide emissions within the boundary will facilitate the calculation of subsequent carbon emissions.

[0017] In one embodiment, the baseline scenario includes: identifying an alternative for the capture end of the project as venting the production facility tail gas on-site at the production site without legal or regulatory requirements for treatment or mandatory recovery of the carbon dioxide; and

[0018] An alternative to the recovery end of the project is identified as the project utilizing water for recovery production prior to commencement of the project.

[0019] By replacing the capture end and oil recovery end of the project with corresponding scenarios and setting them as the baseline scenario of the project, the direct exhaust emissions generated by the production facilities in the absence of project activities can be calculated, which is conducive to the subsequent calculation of carbon emission reductions.

[0020] In one embodiment, in the step of calculating the carbon emissions generated by the baseline scenario, the carbon emissions generated by the baseline scenario are calculated according to the following formula:

[0021] BE y =W iw0,F,j,y *ω iw0,F,m,j,y

[0022] in:

[0023] BE y = Baseline emissions in year y without project activities, in tons of carbon dioxide (tCO 2 );

[0024] W iw0,F,j,y = the mass of fluid injected into the jth injection well in year y, in tons (t);

[0025] ω iw0,F,m,j,y = CO2 mass concentration of the injected fluid at the jth injection well in year y, dimensionless;

[0026] or

[0027]

[0028]

[0029] Where BEy = baseline emissions in year y without project activities, in tons of carbon dioxide (tCO 2 e);

[0030] VF,j,y = the volume of fluid injected into the jth injection well in the yth year under standard conditions, cubic meters (m 3 );

[0031] ω F,V,j,y = CO2 volume concentration of the fluid injected into the jth injection well in year y, dimensionless;

[0032] ρCO 2 ,n,B,j,y=density of carbon dioxide injected into the jth injection well in year y, g / cm3 (g / cm 3 );

[0033] Pn,B,j,y = pressure of fluid injected into the jth injection well in year y, Pascals (Pa);

[0034] MMCO 2 = molar mass of carbon dioxide injected at the injection well, 44.01 kg / kmol;

[0035] Tn,B,j,y = temperature of the fluid injected into the jth injection well in year y, Kelvin (K);

[0036] Ru = ideal gas constant, 8314 Pascal·m3 / kmol·Kelvin (Pa·m 3 / kmol·K).

[0037] The carbon emissions generated under the baseline scenario can be calculated based on the above formula.

[0038] In one embodiment, in calculating the carbon emissions generated by the project activity based on the boundary and the carbon dioxide emission sources included in the boundary, the carbon emissions generated by the project activity are calculated according to the following formula:

[0039] PE y =PE capt,y +PE transport,y +PE inject,y +PE separate,y +PE ri,transport,y +PE reinject,y +PE carrier,y +PE organ,y

[0040] Among them, PE y = Emissions from project activities in year y, in tons of carbon dioxide (tCO 2 e);

[0041] PE capt,y = Project emissions of CO2 capture systems in year y, including emissions from fossil fuel combustion, electricity and steam consumption, in tons of CO2 (tCO 2 e);

[0042] PE transport,y = Project emissions of carbon dioxide from the transport sector in year y, including emissions from fossil fuel combustion and electricity consumption, in tons of carbon dioxide (tCO 2 e);

[0043] PE inject,y = Project emissions of CO2 injection in year y, including emissions from electricity consumption, in tons of CO2 (tCO 2 e);

[0044] PE separate,y = Project emissions from the separation of oil well production gas in year y, including emissions from fossil fuel combustion, electricity and steam consumption, in tons of carbon dioxide (tCO 2 e);

[0045] PE organ,y = Emissions from organized venting of crude oil surface engineering in year y, in tons of carbon dioxide (tCO 2 e);

[0046] PE carrier,y = CO2 emissions from external transport media in year y, in tons of CO2 (tCO 2 e).

[0047] The carbon emissions generated by the project activities are calculated according to the above formula.

[0048] In one embodiment, in the step of calculating the carbon emission reduction amount based on the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario, the carbon emission reduction amount is calculated according to the following formula:

[0049] ERy=BEy-PEy-LEy

[0050] Where ERy = emission reduction of the project in year y, in tons of carbon dioxide (tCO 2 e);

[0051] BEy = baseline emissions in year y, in tons of carbon dioxide (tCO 2 e);

[0052] PEy = Project emissions in year y, in tons of carbon dioxide (tCO 2 e);

[0053] LEy = leakage of the project in year y, in tons of carbon dioxide (tCO 2 e).

[0054] According to the above formula, the carbon emission reduction can be calculated, and the carbon dioxide emission reduction based on CCER voluntary carbon emission reduction CCUS-EOR project can be accounted for.

[0055] A CCUS-EOR carbon emission reduction accounting device, comprising:

[0056] The acquisition module is used to obtain the boundaries of the project;

[0057] A confirmation module, used for confirming the carbon dioxide emission sources contained in the boundary;

[0058] an identification module for identifying a baseline scenario for the project;

[0059] A baseline scenario calculation module, used to calculate the carbon emissions generated by the baseline scenario;

[0060] a project carbon emission calculation module, for calculating the carbon emission generated by the project activities according to the boundary and the carbon dioxide emission sources included in the boundary; and

[0061] The emission reduction calculation module is used to calculate the carbon emission reduction according to the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario.

[0062] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the CCUS-EOR carbon emission reduction accounting method as described in any of the above embodiments are implemented.

[0063] A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the CCUS-EOR carbon emission reduction accounting method described in any of the above embodiments are implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 The figure is a calculation step diagram of a CCUS-EOR carbon emission reduction calculation method according to an embodiment.

[0065] Figure 2 A schematic diagram of the boundaries of a CCUS-EOR carbon emission reduction accounting method according to an embodiment. DETAILED DESCRIPTION

[0066] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0067] like Figure 1 As shown, in one embodiment, the CCUS-EOR carbon emission reduction accounting method is applied to a project of a coal-to-gas device in a fertilizer plant of a certain company, specifically including the following steps:

[0068] Step 110, obtaining the boundaries of the project, where Figure 2 As shown, the project boundaries of this embodiment include:

[0069] Carbon dioxide capture system. The carbon dioxide capture system includes carbon dioxide capture facilities, which specifically include carbon dioxide process production equipment and supporting auxiliary production facilities. The carbon dioxide process production equipment includes compression units, liquefaction and purification units, refrigeration units and fresh air replenishment units. The supporting auxiliary production facilities include tank farms and loading facilities, device transformer substations, initial contaminated rainwater tanks, power supply systems and circulating water systems.

[0070] Carbon dioxide transportation system. The carbon dioxide transportation system includes carbon dioxide transportation facilities. The project of this embodiment uses truck transportation in the first two years and pipeline transportation starting from the third year. The transportation station is equipped with one first station, one terminal and five valve chambers.

[0071] The production system related to oil production, in this embodiment, specifically includes a carbon dioxide injection system, a crude oil lifting system, and an oil and gas gathering and transportation system. Specifically, the carbon dioxide injection system includes a captured carbon dioxide injection part and a reinjection gas injection part. Among them, the carbon dioxide injection system is separated from the liquid CO 2 The gas is transported to each gas injection station through pipelines, and then pressurized by high-pressure filling pumps, and then transported to the gas injection wells under their jurisdiction through distribution metering valve groups. 2 Cryogenic storage tanks and 28 CO 2 Filling pump. The crude oil lifting system adopts the method of lifting with a rod pump, and the machine-produced well is completed by a pumping unit and an electric pump. The oil and gas gathering and transportation system adopts the gathering and transportation process of "series pipe network, wellhead heating, high-efficiency insulation, and trunk auxiliary heating". It involves booster pumps, external transmission pumps, submersible pumps, water feeding pumps, electric heating furnaces, electromagnetic heaters, etc.

[0072] The carbon dioxide flooding and storage area of ​​the oil field, or the carbon dioxide gas injection reservoir block of the oil field, the flooding end of this embodiment is a block of a certain oil field, and the injection of carbon dioxide into the formation and its migration, dissolution and mineralization are all carried out in this formation.

[0073] Carbon dioxide separation and compression facilities in produced oil and gas. In this embodiment, an associated gas compressor, a dehydration skid, an air compressor room, etc. are set up in a certain oil field processing station to separate the produced oil and gas, and the separated associated gas is directly pressurized and re-injected into the oil production block of this embodiment.

[0074] The storage facility of carbon dioxide. 2 Enter CO 2 Storage in tanks, CO 2 The storage tank adopts vacuum insulation tank.

[0075] The carbon dioxide geological escape monitoring boundary is specifically based on the geographical area where the project oil recovery and storage area is located, and extends outward by 1 to 3 kilometers. In this embodiment, the carbon dioxide geological escape monitoring boundary is based on the geographical area where the project oil recovery and storage site is located, and extends outward by 1 kilometer.

[0076] Step 130, confirm the carbon dioxide emission sources contained in the boundary; specifically, the carbon dioxide emission sources include steam and electricity consumption during capture, fossil fuel fuel and electricity consumption during transportation, electricity consumption during injection, electricity consumption generated during crude oil lifting, fossil fuel combustion and electricity consumption during oil and gas gathering and transportation, escape during reinjection gas transportation, organized venting during operation, carbon dioxide carried by external transmission medium in carbon dioxide oil recovery, and at least one of the electricity consumed for produced gas reinjection. In this embodiment, the carbon dioxide emission sources will be combined with the calculation within the boundary, that is, each system within the boundary will include a corresponding carbon dioxide emission source.

[0077] In this example, the greenhouse gas emission sources and greenhouse gas types included in the project boundary are as follows:

[0078]

[0079]

[0080] Step 150, identify the baseline scenario for the project. Possible alternatives for project activities should be:

[0081] Possible alternatives for the T-discharge end include:

[0082] T1: In the absence of legal or regulatory requirements for the treatment or mandatory recovery of CO2, the exhaust gas from production facilities is discharged on site at the production site.

[0083] T2: The carbon dioxide in the exhaust gas is captured and discharged to other locations, such as being transported to a shipyard for welding protection.

[0084] T3: The carbon dioxide in the exhaust gas is captured and purified, and then used in new or existing production facilities at other locations for food processing, such as beverage production.

[0085] T4: The carbon dioxide in the exhaust gas is captured and purified, and new or existing production facilities are built at the same location for chemical processing, such as the production of ethylene carbonate products.

[0086] T5: The carbon dioxide in the exhaust gas is captured and purified, and new or existing production facilities are built at other locations for chemical processing, such as the production of ethylene carbonate products.

[0087] Possible alternatives for the Q flooding end include:

[0088] Q1: The proposed project activity is not implemented as a voluntary emission reduction project.

[0089] Q2: Before the project started, the project utilized natural energy mining.

[0090] Q3: Before the project started, water was used for oil recovery.

[0091] Q4: Before the project started, nitrogen was used for oil recovery.

[0092] Q5: Before the project started, the project used carbon dioxide mined from carbon dioxide deposits for oil recovery.

[0093] In the baseline scenario of this embodiment, laws and regulations do not require the recycling of carbon dioxide emitted by the coal gasification device, and the carbon dioxide tail gas generated by the device is directly discharged into the atmosphere. Direct discharge is the baseline scenario of the emission end of this embodiment. Before the project started, the block in the embodiment adopted water drive mining. Therefore, the use of water for oil recovery is the baseline scenario of this embodiment.

[0094] Step 170, calculate the carbon emissions generated by the baseline scenario. According to the accounting method of the present invention, the baseline emissions of this embodiment are the direct emissions of tail gas generated by the production facilities without project activities. The fluid captured in the embodiment is 99 mol% carbon dioxide, 0.08 mol% carbon monoxide, and 0.92 mol% nitrogen. The annual injection of carbon dioxide in the embodiment is 700,000 tons, and the mass concentration of carbon dioxide in the injected fluid is calculated to be 99.36 wt%. The calculation formula for the baseline emissions in this embodiment is:

[0095] BE y =W iw0,F,j,y ×ω iw0,F,m,j,y

[0096] Among them: BE y = Baseline emissions in year y without project activities, in tons of carbon dioxide (tCO 2 e); W iw0,F,j,y = the mass of fluid injected into the jth injection well in year y, in tons (t); ω iw0,F,m,j,y = the mass concentration of carbon dioxide injected into the fluid at the jth injection well in the yth year, dimensionless.

[0097] Specifically,

[0098] BE y =W iw0,F,j,y ×ω iw0,F,m,j,y = 700,000t × 99.36wt% = 695,520tCO 2

[0099] The descriptions and data sources of some parameters are as follows:

[0100]

[0101] Step 190, calculating the carbon emissions generated by the project activities according to the boundary and the carbon dioxide emission sources included in the boundary. Specifically, the carbon emissions of the project in this embodiment are calculated using the following formula:

[0102] PE y =PE capt,y +PE transport,y +PE inject,y +PE separate,y+PE ri,transport,y +PE reinject,y +PE carrier,y +PE organ,y

[0103] Among them, PE y = Emissions from project activities in year y, in tons of carbon dioxide (tCO 2 e); PE capt,y = Project emissions of CO2 capture systems in year y, including emissions from fossil fuel combustion, electricity and steam consumption, in tons of CO2 (tCO 2 e); PE transport,y = Project emissions of carbon dioxide from the transport sector in year y, including emissions from fossil fuel combustion and electricity consumption, in tons of carbon dioxide (tCO 2 e); PE inject,y = Project emissions of CO2 injection in year y, including emissions from electricity consumption, in tons of CO2 (tCO 2 e); PE separate,y = Project emissions from the separation of oil well production gas in year y, including emissions from fossil fuel combustion, electricity and steam consumption, in tons of carbon dioxide (tCO 2 e); PE organ,y = Emissions from organized venting of crude oil surface engineering in year y, in tons of carbon dioxide (tCO 2 e); PE carrier,y = CO2 emissions from external transport media in year y, in tons of CO2 (tCO 2 e).

[0104] In this embodiment, the carbon emissions generated by the carbon dioxide capture system are:

[0105] PE capt,y =PE capt,el,y +PE capt,th,y

[0106] Among them: PE capt,y = Project emissions from the CO2 flooding and storage project capture system in year y, in tons of CO2 (tCO 2 e); PE capt,el,y = CO2 emissions from electricity consumed by the CO2 capture system in year y, in tons of CO2 (tCO 2 e); PE capt,th,y = CO2 emissions from heat consumption by the CO2 capture system in year y, in tons of CO2 (tCO 2 e).

[0107] Among them, the project emissions generated by consuming electricity are:

[0108] Project emissions from electricity consumption (PE capt,el,y ) is calculated according to the latest version of the “Baseline, Project and / or Leakage Emissions Calculation Tool for Electricity Consumption”, where PE capt,el,y Equivalent to PE in tools EC,y Project emissions from electricity consumption are calculated as follows:

[0109] PE EC,y =∑EC PJ,j,y ×EF EL,j,y ×(1+TDL j,y )

[0110] Among them: EC PJ,j,y The amount of electricity consumed by source j in year y (tCO 2 / year); EF EL,j,y Electricity emission factor from source j in year y (tCO 2 / year); TDLj,y is the average transmission and distribution loss rate of electricity supplied to power source j in year y. According to the tool, a default value of 20% is selected to calculate project emissions.

[0111] j Project electricity consumption source, follow the "Electricity System Emission Factor Calculation Tool". The electricity emission factor is:

[0112] EF EL,y =0.5×EF OM,y +0.5×EF BM,y

[0113] Among them: EF OM With EF BM They represent the marginal emission factor of electricity and the marginal emission factor of capacity, expressed in tCO 2 / MWh meter.

[0114] In this embodiment, the project emissions generated by consuming heat are:

[0115] PE capt,th,y =HG capt,y ×EF th

[0116] Among them: PE th,y = Emissions from the project of heat consumption for CO2 capture in year y, in tons of CO2 (tCO 2 e); HG capt,y = the amount of heat purchased in year y, in gigajoules (GJ); EF th = Emission factor for heat production, in tons of CO2 / GJ (tCO 2 / GJ).

[0117] In this embodiment, the emission of carbon dioxide transportation is:

[0118] PE transport,y =PE transport,fuel,y +PE transport,el,y

[0119] Among them: PE transport,y = Project emissions from the transportation part of the CO2 flooding and storage project in year y, in tons of CO2 (tCO 2 e); PE transport,fuel,y = CO2 emissions from fossil fuel consumption in the transport sector in year y, in tons of CO2 (tCO 2 e); PE transport,el,y = CO2 emissions from electricity consumption in the transport sector in year y, in tons of CO2 (tCO 2 e).

[0120] In this example, the project consuming fossil fuels emits PE transport,fuel,y Calculated according to the latest version of "Project or Leakage Emission Calculation Tool for Fossil Fuel Combustion", where PE transport,fuel,y Equivalent to PE in tools FC,j,y .

[0121] In this example, the project emissions from fossil fuels are:

[0122] PE AF,y =ΣFC j,y ×EF j,y

[0123] Among them: FC j,y The amount of fuel j burned in year y, kg / year or Nm 3 / year; EF j,y CO of fuel j in year y 2 Emission factor, tCO 2 e / kg or tCO 2 e / Nm 3 EF j,y Two calculation methods are used, A:EF i,y =w C,i,y ×ρ i,y ×44 / 12; B:EF i,y =NCV i,y ×EF CO2,i,y。 A is preferred, and B is selected when A is not available. The carbon content and density of LNG and diesel are not available for this project, so method B is selected to calculate EFi,y.

[0124] EF j,y =NCVj,y ×EF CO2,j,y

[0125] Among them: NCV j,y Net calorific value of fuel j in year y (MJ / Nm 3 ). EF CO2,j,y CO of fuel j in year y 2 Emission factor, tCO 2 / MJ;EF CO2,j,y =EF C,j,y ×δ j,y ×44 / 12. Among them, EF C,j,y The carbon content of the fossil fuel j per unit calorific value used in the project in year y, expressed in tC / TJ. j,y is the carbon oxidation rate during the combustion of fossil fuel j used in the project in year y. j is the type of fuel burned during the process in year y.

[0126] In this embodiment, the emission of the carbon dioxide injection part is:

[0127] PE inject,y =PE inject,el,y

[0128] Among them: PE inject,y = Emissions of CO2 injected into the CO2 flooding and storage project in year y, in tons of CO2 (tCO 2 e); PE inject,el,y = CO2 emissions from electricity consumption by CO2 injection wells in year y, in tons of CO2 (tCO 2 e).

[0129] In this embodiment, the discharge of the separated part of the oil well produced gas is:

[0130] PE seperat,y =PE seperat,fuel,y +PE seperat,el,y +PE seperat,th,y

[0131] Among them: PE seperat,y = The project emission of the oil well produced gas separation part of the CO2 flooding and storage project in year y, in tons of CO2 (tCO 2 e); PE seperat,fuel,y = CO2 emissions from the consumption of fossil fuels in the separation of oil well gas in year y, in tons of CO2 (tCO 2 e); PE seperat,el,y = CO2 emissions from electricity consumption for gas separation in oil wells in year y, in tons of CO2 (tCO 2 e); PE seperat,th,y= CO2 emissions from heat consumption during oil well gas separation in year y, in tons of CO2 (tCO 2 e).

[0132] In this embodiment, the amount of carbon dioxide emitted during the transportation of carbon dioxide separated from the produced gas is: PE ri,transport,y =(V F,g,CO2,y -∑ j V F,riw,j,y )×ω riw,F,V,j,y ×ρ riw,n,CO2,n,B,j,y

[0133]

[0134] Among them: PE riw,transport,y = the amount of carbon dioxide emitted during the transportation of carbon dioxide separated from produced gas in year y, in tons of carbon dioxide (tCO 2 e); V F,g,CO2,y = The volume of the reinjected gas separated at the gas separation and boosting station in year y under standard conditions, cubic meters (m 3 );V F,riw,j,y = The volume of reinjected gas injected into the jth reinjection well in year y under standard conditions, cubic meters (m 3 );ω riw,F,V,j,y = CO2 volume concentration of the fluid injected into the reinjection well in year y, dimensionless; ρ riw,CO2,n,B,j,y = CO2 density injected into the reinjection well in year y, g / cm3 (g / cm 3 ). riw,n,B,j,y = Pressure of fluid injected into the reinjection well in year y, Pascal (Pa); MM CO2 = molar mass of carbon dioxide injected into the reinjection well in year y, 44.01 kg / kmol; T riw,n,B,j,y = Temperature of the fluid injected into the reinjection well in year y, Kelvin (K); R u = ideal gas constant, 8314 Pascal·m3 / kmol·Kelvin (Pa·m 3 / kmol·K).

[0135] In this embodiment, the emissions generated by carbon dioxide reinjection are:

[0136] PE reinject,y =PE reinject,el,y

[0137] Among them: PE inject,y = Emissions of CO2 reinjection from the CO2 flooding and storage project in year y, in tons of CO2 (tCO 2 e); PE inject,el,y= CO2 emissions from electricity consumption in CO2 injection wells in year y, in tons of CO2 (tCO 2 e).

[0138] In this embodiment, the carbon dioxide emissions carried by the external transport medium are:

[0139]

[0140] Among them: PE carrier,y = CO in year y 2 The carbon dioxide carried by the external medium (such as crude oil, produced water, and natural gas) of the oil recovery and storage project to the outside of the boundary, in tons of carbon dioxide (tCO 2 e);AD out,j,y = the amount of the jth type of external medium in the yth year, in tons or cubic meters (t or m 3 );Φ out,j,y = mass fraction of carbon dioxide in the jth type of external medium in the yth year, in tons / ton or tons / cubic meter (t / t or t / m 3 );

[0141] In this embodiment, the carbon dioxide emissions generated by the organized venting of crude oil surface engineering are:

[0142] PE organ,y =PE iw,y +PE riw,y +PE pw,y

[0143] Among them: PE iw,y = Project emissions from injection well venting caused by injection well maintenance work in year y, in tons of carbon dioxide (tCO 2 e); PE riw,y = Project emissions resulting from the emptying of the reinjection well due to maintenance work in the reinjection well in year y, in tons of carbon dioxide (tCO 2 e); PE pw,y = Project emissions from well venting caused by maintenance work on the production well in year y, in tons of carbon dioxide (tCO 2 e); When the injection well is emptied due to maintenance work, according to the conservative principle, the carbon dioxide in the injection well is completely emptied, and the carbon dioxide fluid density at the temperature and pressure at the wellhead is the largest, and calculation is carried out.

[0144] PE iw,y =∑ j V iw,j,y ×ω F,V,j,y ×ρ CO2,n,B,j,y

[0145]

[0146] Where: V iw,j,y = Volume of injection well j in year y, cubic meters (m 3 );ω F,v,j,y = CO2 volume concentration of fluid injected into the injection well in year y, dimensionless; ρ CO2,n,Bj,y = CO2 density injected into the injection well in year y, g / cm3 (g / cm 3 ). n,B,j,y = Pressure of fluid injected into the injection well in year y, Pascal (Pa); MM CO2 = molecular weight of carbon dioxide, kg / kmol; T n,B,j,y = Temperature of the fluid injected into the injection well in year y, Kelvin (K); R u = ideal gas constant, 8314 Pascal·m3 / kmol·Kelvin (Pa·m 3 / kmol·K).

[0147] In this embodiment, the reinjection well is emptied due to maintenance work. According to the conservative principle, the carbon dioxide in the reinjection well will be completely emptied, and the density is the largest under the temperature and pressure at the wellhead, and the calculation is performed:

[0148] PE riw,y =∑ j V riw,j,y ×ω riw,F,V,j,y ×ρ CO2,n,B,j,y

[0149]

[0150] Where: V riw,j,y = Volume of the jth reinjection well in year y, cubic meters (m 3 );ω riw,F,v,j,y = the volume concentration of carbon dioxide injected into the jth reinjection well in year y, dimensionless; ρ riw,CO2,n,B,j,y = CO2 density injected into the jth reinjection well in year y, g / cm3 (g / cm 3 ). riw,n,B,j,y = Pressure of fluid injected into the jth reinjection well in year y, Pascal (Pa); MM CO2 = molecular weight of carbon dioxide, kg / kmol; T riw,n,B,j,y = Temperature of the fluid injected into the jth reinjection well in year y, Kelvin (K); R u = ideal gas constant, 8314 Pascal·m3 / kmol·Kelvin (Pa·m 3 / kmol·K).

[0151] Maintenance work on the production well causes the carbon dioxide in the formation to be vented through the production well. Monitor the gas-oil ratio of the produced fluid from the production well, as well as the temperature, pressure, and carbon dioxide concentration of the wellhead gas. Monitor the amount of crude oil recovered during the operation.

[0152] PE pw,y =∑ j V pw,oil,j,y ×θ pw,F,j,y ×ω pw,F,v,j,y ×ρ CO2,n,B,j,y

[0153]

[0154] Where: V pw,oil,j,y = the amount of crude oil recovered from the jth operating well in the yth year, tons (t); θ pw,F,j,y = Oil-gas ratio of the fluid produced from the jth production well in the yth year, cubic meters / ton (m 3 / t)ω pw,F,v,j,y = CO2 volume concentration of gas produced from the jth production well in the yth year, dimensionless. ρ pw,CO2,n,B,j,y = Density of gas produced at the jth production well in year y, g / cm3 (g / cm 3 ). n,B = the pressure of the fluid produced at the jth production well in the yth year, Pascal (Pa); MM CO2 = molecular weight of carbon dioxide, kg / kmol; T n,B,j,y = the temperature of the fluid produced at the jth production well in the yth year, Kelvin (K); R u = ideal gas constant, 8314 Pascal·m3 / kmol·Kelvin (Pa·m 3 / kmol·K).

[0155] In this embodiment, there is no need to consider leakage of items, so this item is 0.

[0156] Specifically, in this embodiment, the carbon emissions of the carbon dioxide capture system are:

[0157] PE capt,y =PE capt,el,y +PE capt,th,y =PE EC,y =∑EC PJ,j,y ×EF EL,j,y ×(1+TDL j,y )+HG capt,y ×EF th =185486tCO 2 .

[0158] The descriptions and data sources of some parameters are as follows:

[0159]

[0160]

[0161]

[0162] Specifically, in this embodiment, the carbon emissions of the carbon dioxide delivery system are: PE transport,y =PE transport,fuel,y +PE transport,el,y =ΣFCi,y×NCVi,y×EF CO2,i,y +PE EC,y =∑EC PJ,j,y ×EF EL,j,y ×(1+TDL j,y )

[0163] In the first two years of operation, tank trucks were used to transport carbon dioxide. The calculated emissions from transportation in the first two years were 3764.69 tCO. 2 ; In the third year, it was changed to pipeline transportation, and the emission was 3979.55tCO 2 .

[0164] The emissions from the CO2 injection system are: PE inject,y =PE inject,el,y =PE EC,y =∑EC PJ,j,y ×EF EL,j,y ×(1+TDL j,y )

[0165] The power consumption of the gas injection part in the first two years of operation of the embodiment is 21678.8MWh, and the emission of the transportation part in the first two years is calculated to be 18519.77tCO 2 ; Starting from the third year, the power consumption is 15552MWh and the emission is 13285.76tCO 2 .

[0166] The emissions from the separation of oil well produced gas are: PE seperat,y =PE seperat,fuel,y +PE seperat,el,y =PE EC,y =∑EC PJ,j,y ×EF EL,j,y ×(1+TDL j,y )+ΣFCi,y×NCVi,y×EF CO2,i,y =18289.82tCO 2 .

[0167] The amount of carbon dioxide emissions that escape during the transportation of carbon dioxide separated from produced gas is calculated in advance, and the monitoring data required for the calculation of fugitive emissions cannot be obtained. In addition, this part of the emissions is extremely small and has little impact on the calculation of the overall emission reduction. Therefore, in the pre-calculation stage of the project, the amount of carbon dioxide emissions that escape during the transportation of carbon dioxide separated from produced gas is temporarily ignored and recorded as 0. The data related to this emission will be monitored and recorded during the subsequent project operation.

[0168] The carbon emissions generated by the carbon dioxide reinjection part are: PE reinject,y =PE reinject,el,y =PE EC,y =∑EC PJ,j,y ×EF EL,j,y ×(1+TDL j,y )=403.13tCO 2

[0169] According to the “CCUS-related energy consumption and carbon emission forecast report for a certain oil production block in the example”, the annual power consumption of the reinjection part is 471.9MWh, and the carbon emission is 403.13tCO 2 .

[0170] The carbon dioxide emissions carried by the external medium are:

[0171] According to the embodiment, in the first year of the project operation, the associated gas is exported as natural gas, and the amount of carbon dioxide carried is:

[0172]

[0173] The carbon dioxide emissions from organized venting of crude oil surface projects are:

[0174] PE organ,y =PE iw,y +PE riw,y +PE pw,y

[0175] Calculate PE iw,y＝ 772.81tCO 2 , the embodiment deploys 73 carbon dioxide injection wells. According to the conservative principle, the maximum injection string volume is used as the injection operation well volume. The maximum injection string inner diameter of the embodiment is 76mm, the maximum injection string depth is 3164.67 meters, and the maximum injection string volume of each well is 14.35m according to the cylinder volume formula. 3 The total volume of all injection wells is 1047.49m 3 .

[0176] The description and data sources of some parameters are shown in the following table:

[0177]

[0178]

[0179] Calculate PE riw,y According to the data, five carbon dioxide reinjection wells are deployed in the embodiment. According to the conservative principle, the maximum injection string volume is used as the volume of the injection operation well. The maximum injection string inner diameter of the embodiment is 76mm, and the maximum injection string depth is 3164.67 meters. According to the cylinder volume formula, the maximum injection string volume of each well is 14.35m 3 The total volume of all reinjection wells is 71.75m 3 The annual emissions are as follows:

[0180]

[0181]

[0182] Step 210, calculate the carbon emission reduction amount according to the carbon emission amount generated by the project and the carbon emission amount generated by the baseline scenario. In this embodiment, the carbon emission reduction amount calculation formula is as follows:

[0183] ER y =BE y -PE y -LE y

[0184] Among them: ER y = Emission reduction of the project in year y, in tons of carbon dioxide (tCO 2 e);BE y = Baseline emissions in year y, in tons of carbon dioxide (tCO 2 e); PE y = Project emissions in year y, in tons of carbon dioxide (tCO 2 e);LE y = Project leakage in year y, in tons of carbon dioxide (tCO 2 e).

[0185] In this embodiment, the estimated emission reduction amount in the project design phase is obtained according to the CCUS-EOR carbon emission reduction calculation method of this embodiment:

[0186]

[0187] In one embodiment, a CCUS-EOR carbon emission reduction accounting device is provided, including: an acquisition module for acquiring the boundary of the project; a confirmation module for confirming the carbon dioxide emission sources contained in the boundary; an identification module for identifying the baseline scenario of the project; a baseline scenario calculation module for calculating the carbon emissions generated by the baseline scenario; a project carbon emission calculation module for calculating the carbon emissions generated by the project activities according to the boundary and the carbon dioxide emission sources included in the boundary; and an emission reduction calculation module for calculating the carbon emission reduction according to the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario. The above-mentioned computer accounting system can realize the accounting of the carbon dioxide emission reduction of CCUS-EOR projects based on CCER carbon voluntary emission reduction according to the carbon dioxide recovery and storage carbon emission reduction accounting model in response to the carbon sequestration verification and trading needs of the project in the absence of carbon emission responsibility verification.

[0188] In one embodiment, a computer device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the following steps are implemented: obtaining the boundary of a project; confirming the carbon dioxide emission sources contained in the boundary; identifying the baseline scenario of the project; calculating the carbon emissions generated by the baseline scenario; calculating the carbon emissions generated by the project activities based on the boundary and the carbon dioxide emission sources contained in the boundary; and calculating the carbon emission reduction based on the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario. In one embodiment, when the computer program is executed by the processor, the following steps are implemented: obtaining the boundary of a project; confirming the carbon dioxide emission sources contained in the boundary; identifying the baseline scenario of the project; calculating the carbon emissions generated by the baseline scenario; calculating the carbon emissions generated by the project activities based on the boundary and the carbon dioxide emission sources contained in the boundary; and calculating the carbon emission reduction based on the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario.

[0189] The computer-readable storage medium provided in this embodiment has similar implementation principles and technical effects as those of the above-mentioned method embodiments, and will not be described in detail here. A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned method embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium, and the computer program, when executed, may include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0190] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0191] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A CCUS-EOR carbon emission reduction accounting method, It is characterized in that The steps include: Get the bounds of the item; Identify the sources of CO2 emissions contained within the stated boundary; Identify the baseline scenario for the project; Calculate the carbon emissions resulting from the baseline scenario; Calculate the carbon emissions generated by the project activity based on the boundary and the carbon dioxide emission sources included in the boundary; and The carbon emission reduction is calculated based on the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario.

2. The CCUS-EOR carbon emission reduction calculation method according to claim 1, It is characterized in that The boundary includes: at least one of: carbon dioxide exhaust emission points of energy and industrial facilities, carbon dioxide capture systems, carbon dioxide transportation systems, carbon dioxide injection systems, crude oil lifting systems, oil and gas gathering and transportation systems, carbon dioxide oil recovery storage areas and carbon dioxide geological escape monitoring boundaries.

3. The CCUS-EOR carbon emission reduction calculation method according to claim 1, It is characterized in that The carbon dioxide emission sources include at least one of steam and electricity consumption during capture, fossil fuel and electricity consumption during transportation, electricity consumption during injection, electricity consumption generated during crude oil lifting, fossil fuel combustion and electricity consumption during oil and gas gathering and transportation, escape during reinjection gas transportation, organized venting during operations, carbon dioxide carried by external transmission media in carbon dioxide oil recovery, and electricity consumed during reinjection of produced gas.

4. The CCUS-EOR carbon emission reduction calculation method according to claim 1, It is characterized in that The baseline scenario includes identifying an alternative for the capture side of the project as on-site venting of production facility tail gas without legal or regulatory requirements for treatment or mandatory recovery of the CO2; and An alternative to the recovery end of the project is identified as the project utilizing water for recovery production prior to commencement of the project.

5. The CCUS-EOR carbon emission reduction calculation method according to claim 1, It is characterized in that In the step of calculating the carbon emissions generated by the baseline scenario, the carbon emissions generated by the baseline scenario are calculated according to the following formula: BE y =W iw0,F,j,y *ω iw0,F,m,j,y Among them, BE y = Baseline emissions in year y without project activities, in tons of carbon dioxide (tCO 2 ); W iw0,F,j,y = the mass of fluid injected into the jth injection well in year y, in tons (t); ω iw0,F,m,j,y = CO2 mass concentration of the injected fluid at the jth injection well in year y, dimensionless; or Where BEy = baseline emissions in year y without project activities, in tons of carbon dioxide (tCO 2 e); VF,j,y = the volume of fluid injected into the jth injection well in the yth year under standard conditions, cubic meters (m 3 ); ω F,V,j,y = the volume concentration of carbon dioxide in the fluid injected into the jth injection well in year y, dimensionless; ρCO 2 ,n,B,j,y=density of carbon dioxide injected into the jth injection well in year y, g / cm3 (g / cm 3 ); Pn,B,j,y = pressure of fluid injected into the jth injection well in year y, in Pascals (Pa); MMCO 2 = molar mass of carbon dioxide injected at the injection well, 44.01 kg / kmol; Tn,B,j,y = temperature of the fluid injected into the jth injection well in year y, Kelvin (K); Ru = ideal gas constant, 8314 Pascal·m3 / kmol·Kelvin (Pa·m 3 / kmol·K).

6. The CCUS-EOR carbon emission reduction calculation method according to claim 1, It is characterized in that In calculating the carbon emissions generated by the project activities based on the boundary and the carbon dioxide emission sources included in the boundary, the carbon emissions generated by the project activities are calculated according to the following formula: ON y =PE capt,y +PE transport,y +PE inject,y +PE separate,y +PE ri,transport,y +PE reinject,y +PE carrier,y + ON organ,y Among them, PE y = Emissions from project activities in year y, in tons of carbon dioxide (tCO 2 e); PE capt,y = Project emissions of CO2 capture systems in year y, including emissions from fossil fuel combustion, electricity and steam consumption, in tons of CO2 (tCO 2 e); PE transport,y = Project emissions of carbon dioxide from the transport sector in year y, including emissions from fossil fuel combustion and electricity consumption, in tons of carbon dioxide (tCO 2 e); PE inject,y = Project emissions of CO2 injection in year y, including emissions from electricity consumption, in tons of CO2 (tCO 2 e); PE separate,y = Project emissions from the separation of oil well production gas in year y, including emissions from fossil fuel combustion, electricity and steam consumption, in tons of carbon dioxide (tCO 2 e); PE organ,y = Emissions from organized venting of crude oil surface engineering in year y, in tons of carbon dioxide (tCO 2 e); PE carrier,y = CO2 emissions from external transport media in year y, in tons of CO2 (tCO 2 e).

7. The CCUS-EOR carbon emission reduction calculation method according to claim 1, It is characterized in that In the step of calculating the carbon emission reduction amount based on the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario, the carbon emission reduction amount is calculated according to the following formula: ERy=BEy-PEy-LEy Where ERy = emission reduction of the project in year y, in tons of carbon dioxide (tCO 2 e); BEy = baseline emissions in year y, in tons of carbon dioxide (tCO 2 e); PEy = Project emissions in year y, in tons of carbon dioxide (tCO 2 e); LEy = leakage of the project in year y, in tons of carbon dioxide (tCO 2 e).

8. A CCUS-EOR carbon emission reduction accounting device, It is characterized in that include: The acquisition module is used to obtain the boundaries of the project; A confirmation module, used for confirming the carbon dioxide emission sources contained in the boundary; an identification module for identifying a baseline scenario for the project; A baseline scenario calculation module, used to calculate the carbon emissions generated by the baseline scenario; A project carbon emission calculation module, used to calculate the carbon emission generated by the project activities according to the boundary and the carbon dioxide emission sources included in the boundary; and The emission reduction calculation module is used to calculate the carbon emission reduction according to the carbon emissions generated by the project and the carbon emissions generated by the baseline scenario.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program. It is characterized in that When the processor executes the computer program, the steps of the CCUS-EOR carbon emission reduction accounting method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the steps of the CCUS-EOR carbon emission reduction accounting method according to any one of claims 1 to 7 are implemented.

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