Land-sea integrated full-process CO2 geological utilization and storage project technical economic evaluation method and tool

Abstract

The invention discloses a land-sea integrated full-process CO2 geological utilization and storage project technical economic evaluation method and tool. The method comprises the following steps: S1, evaluating and delimiting a full-process CO2 geological utilization and storage range; step S2, an evaluation process; s3, selecting a full-process CCUS technical scheme; and S4, carrying out full-process CCUS technical economic evaluation. The invention relates to the technical field of environmental science and engineering. According to the land-sea integrated full-process CO2 geological utilization and storage project technical economic evaluation method and tool, the problem of how to obtain information such as a technical scheme, cost budget, project layout and planning of a full-process CO2 geological utilization and storage project suitable for an enterprise or a technical and economic environment under the condition of lacking CO2 storage project experience and data is solved; and the feasibility of project development is provided.

Description

Technical Field

[0001] The present invention relates to the field of environmental science and engineering technology, and specifically to a technical and economic evaluation method and tool for a full-process land-sea integrated CO2 geological utilization and storage project. Background Art

[0002] Global climate change is primarily attributed to the continued rise in atmospheric greenhouse gas concentrations, with carbon dioxide emissions being the primary factor. To address this challenge, CCUS technology is considered an important means of mitigating climate change. Land-sea integrated CCUS projects combine the advantages of both land and sea, offering broad application prospects. However, China currently has no operational land-sea integrated CCUS projects, and related techno-economic evaluation methods are relatively scarce. Techno-economic evaluation studies on CO2 storage projects in saline aquifers in marine sedimentary basins are even rarer. Therefore, conducting research on techno-economic evaluation methods for land-sea integrated CCUS across multiple technology routes is of great practical significance.

[0003] Most studies on the technical and economic evaluation of the full-process CCUS are on onshore CCUS projects or offshore CCUS projects. There are fewer studies on integrated land and sea CCUS projects, and even fewer studies on the technical and economic aspects of CCUS with multiple technical routes.

[0004] CCUS technology encompasses CO2 capture, transportation, utilization, and storage. Currently, onshore CCUS projects have a certain level of development experience, with some success in CO2 capture and onshore storage. However, the development of land-sea CCUS projects has lagged behind due to the marine environment and complex transportation and storage conditions. Existing research on CCUS techno-economic assessments primarily focuses on onshore projects, and the assessment methods for land-sea projects lack a systematic approach. Some studies focus solely on the cost assessment of a single link, without considering the techno-economic analysis of the entire process. Furthermore, comprehensive assessments of multiple technical routes are rarely addressed.

[0005] Therefore, a technical and economic evaluation method and tool for full-process CO2 geological utilization and storage projects integrating land and sea is invented to help enterprises, governments or other CCUS-related stakeholders understand the technical methods and costs of full-process CO2 geological utilization and storage projects in onshore sedimentary basins or oil reservoirs, marine sedimentary basins or oil reservoirs, and land-sea integrated sedimentary basins or oil reservoirs, and to solve the problem of how to obtain technical solutions, cost budgets, project layout and planning and other information for full-process CO2 geological utilization and storage projects suitable for the technical and economic environment of enterprises in the absence of CO2 storage project experience and data, and to propose the feasibility of project implementation. Summary of the Invention

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a technical and economic evaluation method and tool for a full-process land-sea integrated CO2 geological utilization and storage project, comprising the following steps:

[0007] Step S1: Assessment and delineation of the scope of CO2 geological utilization and storage throughout the entire process;

[0008] The whole process of CO2 geological utilization and storage includes CO2 capture, compression, transportation, geological utilization and storage;

[0009] Among them, the CO2 capture technology includes post-combustion amine solution absorption method and cryogenic distillation technology;

[0010] The compression technology includes CO2 liquid compression and CO2 supercritical compression;

[0011] The geological utilization and storage include CO2 saline aquifer storage in onshore sedimentary basins, CO2 saline aquifer storage in marine sedimentary basins, and CO2 enhanced oil recovery in onshore oil reservoirs;

[0012] Step S2, evaluation process;

[0013] Develop a full-process CCUS technology plan including capture, compression, transportation, utilization and storage, and then break down the plan's technical parameters, equipment composition, and engineering workload;

[0014] Investigate the unit cost of each part, form a technical cost list, and finally obtain the technical cost results;

[0015] Step S3: Selection of full-process CCUS technical solution;

[0016] Select appropriate CCUS technologies for each link based on the company's characteristics, determine the technical solutions for each link, analyze technical parameters and engineering workload, and come up with a full-process CCUS technical solution;

[0017] Step S4: Technical and economic evaluation of the entire CCUS process;

[0018] Determine the cost composition list of technical methods in each link and conduct cost assessment through preliminary estimate method.

[0019] Preferably, the investment cost calculation method of the full-process CCUS project is as follows:

[0020] C capi =C capi 1-x +C capi 2-x +C capi 3-x +C capi 4-x ;

[0021] C capi 1-x =∑P 1-i *Q 1-i (i=1,2,……,n);

[0022] C capi 2-x =∑P 2-i *Q 2-i (i=1,2,……,n);

[0023] C capi 3-x =∑P 3-i *Q 3-i (i=1,2,……,n);

[0024] C capi 4-x =∑P 4-i *Q 4-i (i=1,2,……,n);

[0025] Where C capi is the investment cost of the full-process CCUS project, C capi 1-x 、C capi 2-x 、C capi 3-x 、C capi 4- x is the investment cost of capture, compression, transportation, and storage, and x is the technical solution selected for each link. One technical solution is selected for each link; P 1-i is the unit price of the i-th investment in the capture technology solution, Q 1-i is the amount of investment in the capture technology option i; P 2-i is the unit price of the i-th investment in the compression technology solution, Q 2-i is the amount of investment in the i-th item of the compression technology solution; P 3-i is the unit price of the i-th investment in the transportation technology solution, Q 3-i is the amount of investment in the transport technology option i; P 4-i is the unit price of the i-th investment in the storage technology solution, Q 4-i The amount of investment in option i for utilizing storage technology;

[0026] The annual operation and maintenance cost of the full-process CCUS project is calculated as follows:

[0027] C O&M =C O&M 1-x +C O&M 2-x +C O&M 3-x+C O&M 4-x ;

[0028] C O&M 1-x =∑P 1-i *Q 1-i (i=1,2,……,n);

[0029] C O&M 2-x =∑P 2-i *Q 2-i (i=1,2,……,n);

[0030] C O&M 3-x =∑P 3-i *Q 3-i (i=1,2,……,n);

[0031] C O&M 4-x =∑P 4-i *Q 4-i (i=1,2,……,n);

[0032] Where, O&M The annual operation and maintenance cost of the full-process CCUS project is C O&M 1-x 、C O&M 2-x 、C O&M 3-x 、C O&M 4-x are the annual operation and maintenance costs of the capture, compression, transportation, and storage links, respectively; x is the technical solution selected for each link, and one technical solution is selected for each link; P 1-i is the unit price of operation and maintenance of item i of the capture technology solution, Q 1-i is the number of operations and maintenance of the i-th capture technology solution; P 2-i Q is the unit price of the i-th operation and maintenance of the compression technology solution, 2-i is the number of operations and maintenance of item i of the compression technology solution; P 3-i is the unit price of the i-th operation and maintenance of the transportation technology solution, Q 3-i is the number of operations and maintenance of the i-th transportation technology solution; P 4-i Q is the unit price of operation and maintenance of item i using the storage technology solution, 4-i is the number of operations and maintenance items using the storage technology solution item i.

[0033] The preferred technical and economic evaluation tool for the full-process land-sea integrated CO2 geological utilization and storage project includes a data input module A, a technical solution module B, a cost calculation module C, a benefit evaluation module D, and a feasibility evaluation module E;

[0034] The data input module A is used to input basic information of the project;

[0035] Technical Solution Module B evaluates different technical route combinations and analyzes their technical feasibility based on the goals and enterprise characteristics;

[0036] Cost calculation module C calculates the cost of each chain and the entire chain project using cost assessment methods based on the input data;

[0037] Benefit Assessment Module D analyzes the project's social and environmental benefits, economic benefits, and risks;

[0038] The feasibility assessment module E integrates the technical, cost and benefit assessment results to determine the feasibility of the CCUS project.

[0039] This invention provides a technical and economic evaluation method and tool for a full-process CO2 geological utilization and storage project that integrates land and sea. It has the following beneficial effects:

[0040] The technical and economic evaluation method and tool for the full-process land-sea integrated CO2 geological utilization and storage project. China currently has no land-sea integrated CCUS project in operation, nor a detailed technical and economic evaluation method for land-sea integrated CCUS projects. There is also little research on the technical and economic evaluation of CO2 saline aquifer storage projects in marine sedimentary basins. Therefore, a technical and economic evaluation method and tool for the full-process land-sea integrated CO2 geological utilization and storage project is invented to help enterprises, governments, or other CCUS-related stakeholders understand the technical methods and costs of full-process CO2 geological utilization and storage projects in onshore sedimentary basins or reservoirs, marine sedimentary basins or reservoirs, and land-sea integrated sedimentary basins or reservoirs. It also solves the problem of how to obtain technical solutions, cost budgets, project layout and planning, and other information for full-process CO2 geological utilization and storage projects suitable for enterprises or technical and economic environments in the absence of CO2 storage project experience and data, and proposes the feasibility of project implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the full-process CCUS technical solution composed of the technologies of the present invention;

[0042] Figure 2 Schematic diagram of the module structure of the full-process CCUS technical and economic assessment tool of the present invention. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] See also Figure 1-2 , the present invention provides a technical solution:

[0045] Technical and economic evaluation method for the full-process CCUS on land and sea:

[0046] Assessment scope:

[0047] The full-process CO2 geological utilization and storage (CCUS) includes CO2 capture, compression, transportation, geological utilization, and storage. CO2 capture technologies include post-combustion amine solution absorption and cryogenic distillation; compression technologies include CO2 liquid compression and CO2 supercritical compression; transportation technologies include onshore pipelines, onshore tank trucks, submarine pipelines, and ships; and geological utilization and storage technologies include CO2 storage in saline aquifers in onshore sedimentary basins, CO2 storage in saline aquifers in marine sedimentary basins, and CO2-enhanced oil recovery (CO2-EOR) in onshore reservoirs.

[0048] Evaluation Process:

[0049] First, a full-process CCUS technical plan including capture, compression, transportation, utilization and storage is formed, and then the technical parameters, equipment composition and engineering quantity of the plan are broken down; the unit cost of each part is investigated to form a technical cost list; finally, the technical cost results are obtained.

[0050] Full-process CCUS technical solution selection:

[0051] The feasible full-process CCUS technology solutions for high-concentration CO2 emission sources after technical cost screening are:

[0052] Capture using cryogenic distillation technology → liquid compression → road tanker transportation → onshore saline aquifer storage / onshore CO2-EOR / onshore saline aquifer storage + CO2-EOR;

[0053] Cryogenic distillation capture → liquid compression → road tanker transportation + ship transportation → marine / onshore + marine (onshore and offshore) saline aquifer storage / onshore and offshore saline aquifer storage + CO2-EOR;

[0054] Cryogenic distillation capture → supercritical compression → onshore pipeline → onshore saline aquifer storage / onshore CO2-EOR / onshore saline aquifer storage + CO2-EOR;

[0055] Cryogenic distillation capture → supercritical compression → onshore pipeline + ship / submarine pipeline transportation → ocean / land-sea saline aquifer storage / / land-sea saline aquifer storage + CO2-EOR;

[0056] The feasible full-process CCUS technology solutions for medium and low concentration CO2 emission sources are:

[0057] Chemical absorption capture → liquid compression → road tanker transportation → onshore saline aquifer storage / onshore CO2-EOR / onshore saline aquifer storage + CO2-EOR;

[0058] Chemical absorption capture → liquid compression → road tanker transportation + ship transportation → ocean / inland and sea saline aquifer storage / inland and sea saline aquifer storage + CO2-EOR;

[0059] Chemical absorption capture → supercritical compression → onshore pipeline → onshore saline aquifer storage / onshore CO2-EOR / onshore saline aquifer storage + CO2-EOR;

[0060] Chemical absorption capture → supercritical compression → onshore pipeline + ship / submarine pipeline transportation → ocean / inland and sea saline aquifer storage / / inland and sea saline aquifer storage + CO2-EOR.

[0061] Full-process CCUS technical and economic assessment method;

[0062] The cost components of each technical approach are determined based on the technology, process, and procedures. Equipment can be adjusted based on the actual conditions of carbon-emitting enterprises. Cost assessment is a preliminary estimate, calculated by multiplying unit price by project quantity. Unit prices for equipment and materials for different technologies, processes, and procedures are determined based on market research, CNPC and Sinopec's budget quotas, and economic evaluation parameters for oil construction. These prices can be adjusted and updated based on market prices, enterprise needs, and quotas.

[0063] The investment cost calculation method for the full-process CCUS project is as follows:

[0064] C capi =C capi 1-x +C capi 2-x +C capi 3-x +C capi 4-x ;

[0065] C capi 1-x =∑P 1-i *Q 1-i (i=1,2,……,n);

[0066] C capi 2-x =∑P2-i *Q 2-i (i=1,2,……,n);

[0067] C capi 3-x =∑P 3-i *Q 3-i (i=1,2,……,n);

[0068] C capi 4-x =∑P 4-i *Q 4-i (i=1,2,……,n);

[0069] Where C capi is the investment cost of the full-process CCUS project, C capi 1-x 、C capi 2-x 、C capi 3-x 、C capi 4- x is the investment cost of capture, compression, transportation, and storage, and x is the technical solution selected for each link. One technical solution is selected for each link; P 1-i is the unit price of the i-th investment in the capture technology solution, Q 1-i is the amount of investment in the capture technology option i; P 2-i is the unit price of the i-th investment in the compression technology solution, Q 2-i is the amount of investment in the i-th item of the compression technology solution; P 3-i is the unit price of the i-th investment in the transportation technology solution, Q 3-i is the amount of investment in the transport technology option i; P 4-i is the unit price of the i-th investment in the storage technology solution, Q 4-i The amount of investment in option i for utilizing storage technology;

[0070] The annual operation and maintenance cost of the full-process CCUS project is calculated as follows:

[0071] C O&M =C O&M 1-x +C O&M 2-x +C O&M 3-x +C O&M 4-x ;

[0072] C O&M 1-x =∑P 1-i *Q 1-i (i=1,2,……,n);

[0073] C O&M 2-x =∑P 2-i *Q 2-i (i=1,2,……,n);

[0074] C O&M 3-x =∑P 3-i *Q 3-i (i=1,2,……,n);

[0075] C O&M 4-x =∑P 4-i *Q 4-i (i=1,2,……,n);

[0076] Where, O&M The annual operation and maintenance cost of the full-process CCUS project is C O&M 1-x 、C O&M 2-x 、C O&M 3-x 、C O&M 4-x are the annual operation and maintenance costs of the capture, compression, transportation, and storage links, respectively; x is the technical solution selected for each link, and one technical solution is selected for each link; P 1-i is the unit price of operation and maintenance of item i of the capture technology solution, Q 1-i is the number of operations and maintenance of the i-th capture technology solution; P 2-i Q is the unit price of the i-th operation and maintenance of the compression technology solution, 2-i is the number of operations and maintenance of item i of the compression technology solution; P 3-i is the unit price of the i-th operation and maintenance of the transportation technology solution, Q 3-i is the number of operations and maintenance of the i-th transportation technology solution; P 4-i Q is the unit price of operation and maintenance of item i using the storage technology solution, 4-i is the number of operations and maintenance items using the storage technology solution item i.

[0077] Technical solutions for each link x Select technical methods for each link based on the characteristics of the enterprise.

[0078] CO2 capture method 1-x, x=1,2,3,...,n:

[0079] x=1 Post-combustion amine solution absorption method. This method is suitable for medium and low concentration carbon sources (CO2 concentration 15% to 80%), such as coal-fired power plants, cement, and steel carbon emission enterprises. The method process is as follows:

[0080] Absorption reaction stage: After the CO2 flue gas is pretreated, it comes into contact with the amine solution to complete the CO2 absorption; the amine solution containing the absorbed CO2 is separated from the air flow by cooling and separation.

[0081] Desorption stage: Release the CO2 absorbed in the amine solution by increasing the temperature or reducing the pressure; recover the amine solution for reuse.

[0082] Recirculation stage: The regenerated amine solution is returned to the absorber to continue circulating to absorb CO2.

[0083] Processing stage: compression and storage of CO2.

[0084] Investment costs primarily consist of equipment, auxiliary civil engineering costs, land acquisition fees, and other costs. Equipment primarily includes absorption units (absorption towers, reaction towers), desorption units (regeneration units), energy exchange units (such as lean-rich liquid heat exchangers, lean-liquid coolers, condensers, and condenser reflux units), system power units (such as lean-liquid pumps, rich-liquid pumps, reflux pumps, booster pumps, and fans), and system auxiliary units (such as flue gas pretreatment units, rehydration units, and filtration units). Operation and maintenance costs primarily include electricity and steam consumption, absorbent consumption, labor costs, equipment operation and maintenance fees, water consumption, and pollutant treatment fees.

[0085] x=2 low temperature distillation technology. Suitable for high concentration carbon sources (CO2 concentration ≥ 80%), such as coal chemical enterprises.

[0086] The method flow is:

[0087] Condensation stage: Gas containing CO2 enters a cryogenic condensation device. A condenser or cryocooler cools the gas to a low temperature, causing the CO2 to begin condensing into a liquid or solid state. At this low temperature, the condensed liquid or solid CO2 is separated from the rest of the gas.

[0088] Desorption stage: The separated liquid or solid CO2 is heated to an appropriate temperature to convert it into gaseous state. The gaseous CO2 is separated from other gases to obtain pure CO2 gas.

[0089] Processing stage: compression and storage of CO2;

[0090] Investment costs primarily consist of equipment and auxiliary engineering costs. Equipment primarily includes purification units, condensation units, heating units, drying units, purification units, and storage units. Operation and maintenance costs primarily include electricity consumption, labor costs, equipment operation and maintenance fees, and water consumption.

[0091] CO2 compression method 2-x, x = 1, 2, 3, ..., n: CO2 compression is part of the capture system, during the processing stage. The captured CO2 is typically in a gaseous state and needs to be compressed to the desired state for transportation. Compression utilizes a multi-stage compressor and booster pump. Depending on the mode of transportation, gaseous CO2 can be compressed into either supercritical CO2 or liquid CO2. The compression work required varies depending on the state.

[0092] The investment costs for x=1CO2 liquid compression and x=2CO2 supercritical compression are primarily the compressor and booster pump. Operation and maintenance costs primarily include electricity consumption, labor costs, and equipment operation and maintenance fees.

[0093] CO2 transportation method 3-x, x=1,2,3,…,n: The transportation methods are divided into pipelines, tank trucks, and ships.

[0094] CO2 pipeline: Suitable for large-scale CO2 transportation, the transported CO2 is in supercritical state or dense phase. The transportation process is:

[0095] Pipeline design: including temperature and pressure parameter design, stability and strength analysis, pipe material and wall thickness design, anti-corrosion and thermal insulation design, and auxiliary facilities

[0096] Engineering construction: including route selection, trenching, pipe laying, landfill, installation, and land restoration

[0097] Operation management: including monitoring, safety management, and pipeline maintenance.

[0098] The x=1 onshore CO2 pipeline and the x=2 submarine pipeline differ in pipeline design, construction, and operations management. Submarine pipeline technology primarily includes material selection, pipeline inspection, dredging, trenching, pipeline laying, riser installation, and pressure testing and pigging techniques.

[0099] The costs of onshore CO2 pipelines are primarily divided into construction costs, including pipe costs, civil engineering and installation costs (including civil construction costs, pipeline installation costs, geotechnical protection costs, cathodic protection, pipe fitting and valve installation, and cleaning tests), land acquisition costs, and other expenses (monitoring and risk assessment costs). Operation and maintenance costs include wages and benefits, repair and maintenance costs, other operating expenses (power costs, monitoring fees), and management fees. The largest investment is in pipe costs, including pipe materials, pipeline anti-corrosion and insulation, and transportation costs.

[0100] The construction costs of submarine pipelines primarily include pre-construction expenses (pre-construction research fees, environmental impact assessment fees, and engineering geological and geomorphological survey fees), material costs (steel pipes, insulation materials, anti-corrosion materials, concrete protective layer, and anti-corrosion joints), pipeline inspection fees, offshore dredging engineering costs (pre-trenching dredging fees, post-trenching dredging fees, and trench protection measures fees), offshore installation fees (including mobilization of pipe-laying vessels and barges, transportation to site, pipeline laying and restoration fees, pre-construction survey fees, riser installation fees, pigging and pressure testing fees, post-laying survey fees, site cleanup fees, and return voyage fees), and other expenses (including survey and design fees, engineering evaluation fees, engineering supervision fees, and acceptance fees). Operation and maintenance costs include wages and benefits, repair and maintenance expenses, other operating expenses (power costs, monitoring fees), and management fees.

[0101] x = 3 tank trucks: Road tank trucks are a mature technology for transporting CO2 and are often used on a small scale. The transported CO2 is generally in liquid form. The transportation process is as follows:

[0102] Liquefied CO2 is loaded into dedicated pressure vessels or liquid gas tankers to ensure sealing and safety.

[0103] The appropriate temperature needs to be maintained during transportation, which is usually achieved through insulation equipment or constant temperature control systems.

[0104] And the pressure of liquefied CO2 needs to be monitored and controlled to ensure that it is within a safe range.

[0105] The investment cost of tank truck transportation is mainly the storage tank (including insulation equipment and pressure monitoring equipment), and the operation and maintenance costs include personnel expenses, fuel costs, and maintenance costs.

[0106] x = 4 Ships: Ship transportation technology is mature and suitable for CO2 transportation in areas with docks. The CO2 transported is generally liquid. The transportation process includes ship design, CO2 loading, transportation, unloading, and return to port for the next shipment.

[0107] The investment costs for shipping primarily include vessel fees, terminal charges, offshore storage facility fees, and onshore storage and loading system fees. Operation and maintenance costs include personnel expenses, fuel costs, maintenance fees, and terminal charges.

[0108] Geological utilization and storage methods 4-x, x = 1, 2, 3, ..., n: Onshore saline aquifer storage, marine saline aquifer storage, and CO2-enhanced oil recovery (CO2-EOR) in onshore reservoirs. The stored CO2 is generally in a supercritical or liquid state.

[0109] x=1 Onshore saline aquifer storage: Onshore saline aquifers in sedimentary basins have a high CO2 storage potential and are suitable for large-scale carbon emission reduction in the industrial energy sector. The onshore saline aquifer storage process is as follows:

[0110] Storage site selection: including geological exploration, 2D or 3D seismic, well logging, data processing, site assessment, and reservoir caprock determination; injection design: including injection method, injection pressure and temperature, reservoir performance assessment, reservoir injection simulation, and monitoring design; well site design: including the layout of injection wells, production wells, and monitoring wells, and drilling and completion design; drilling construction and CO2 injection and storage; monitoring: pre-injection monitoring, in-injection monitoring, and post-injection monitoring; seismic surveys (2D / 3D / 4D), well monitoring, core logging, surface CO2 concentration monitoring, atmospheric monitoring, and other characterization and monitoring; wellhead closure and restoration.

[0111] The investment cost of onshore saline aquifer storage includes site investigation and evaluation (construction costs and data interpretation fees), drilling construction (drilling, completion, logging, cementing, and monitoring well costs), and equipment costs (injection equipment, pressurization equipment, monitoring equipment, and CO2 pipelines connecting the entire well site). Operation and maintenance costs primarily include maintenance and management expenses (including daily drilling maintenance, consumables, surface equipment maintenance, downhole equipment maintenance, wages and benefits), monitoring fees, and CO2 pressurization costs.

[0112] x = 2 Marine saline aquifer storage: Saline aquifers in marine sedimentary basins have significant CO2 storage potential, but the cost is higher than onshore storage. This makes it suitable for large-scale carbon emission reduction in the industrial energy sector, located far from onshore sedimentary basins. The principles of marine geological CO2 storage are similar to those onshore, but the equipment differs slightly. Due to the presence of seawater, marine geological CO2 storage requires an offshore platform to install drilling equipment, store equipment, and conduct drilling and injection operations. The marine saline aquifer storage process is essentially the same as onshore storage, primarily involving: storage site selection, injection design, wellsite design, CO2 injection and storage, monitoring, wellhead closure, and recovery. Each process is designed specifically for marine sedimentary basins. For example, storage site selection must consider the characteristics of marine sedimentary basins; wellsite design, drilling and storage, and injection require additional drilling platforms; and injection and monitoring equipment must be designed with consideration for the corrosion resistance of seawater.

[0113] The investment cost of marine saline aquifer storage increases the investment and maintenance costs of drilling platforms compared to onshore storage, and the unit price of other costs is higher than that of onshore storage.

[0114] x=3 CO2-Enhanced Oil Recovery (CO2-EOR) in Onshore Reservoirs: CO2-EOR in onshore reservoirs primarily uses alternating water and gas injection. The technology is highly mature and in the commercial application stage. The oil recovery process is as follows:

[0115] After being transported and pressurized, CO2 is injected into the injection wells of the oil field alternately with water; in the reservoir, CO2 drives oil through miscible or immiscible phases;

[0116] Some CO2 is stored in immovable oil and voids, while the rest is produced from production wells along with oil, gas and water;

[0117] The produced CO2 is separated and recompressed and then injected into the reservoir together with new CO2 (CO2 in the pipeline is different from CO2 in the reservoir) for CO2-EOR.

[0118] The investment costs for CO2-enhanced oil recovery include site characterization, monitoring, on-site CO2 processing equipment, well pattern / injection / production equipment, pipeline costs, new drilling and completion costs, and repair and modification costs for existing wells. Operations and maintenance costs include corrosion protection, consumables, surface and underground maintenance costs, crude oil hydraulic pumping costs, CO2 recycling and processing costs, and the cost of purchasing and compressing CO2.

[0119] Full-process CCUS technical and economic assessment tool;

[0120] Based on the aforementioned technical and economic assessment method, a modular design concept was adopted to develop an assessment tool, comprising a data input module A, a technical solution module B, a cost calculation module C, a benefit assessment module D, and a feasibility assessment module E. Data input module A is used to input basic project information, such as capture technology type, transportation distance, storage site characteristics, and the entire supply chain. Technical solution module B evaluates different technical route combinations and analyzes their technical feasibility based on objectives and enterprise characteristics. Cost calculation module C, based on the input data, applies cost assessment methods to calculate the costs of each supply chain and the entire supply chain. Benefit assessment module D analyzes the project's social, environmental, economic, and risks. Feasibility assessment module E integrates the technical, cost, and benefit assessment results to determine the feasibility of implementing a CCUS project.

[0121] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0122] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A technical and economic evaluation method for a full-process land-sea integrated CO2 geological utilization and storage project, characterized by: The following steps are involved: Step S1: Assessment and delineation of the scope of CO2 geological utilization and storage throughout the entire process; The whole process of CO2 geological utilization and storage includes CO2 capture, compression, transportation, geological utilization and storage; Among them, the CO2 capture technology includes post-combustion amine solution absorption method and cryogenic distillation technology; The compression technology includes CO2 liquid compression and CO2 supercritical compression; The geological utilization and storage include CO2 saline aquifer storage in onshore sedimentary basins, CO2 saline aquifer storage in marine sedimentary basins, and CO2 enhanced oil recovery in onshore oil reservoirs. Step S2, evaluation process; Develop a full-process CCUS technology plan including capture, compression, transportation, utilization and storage, and then break down the plan's technical parameters, equipment composition, and engineering workload; Investigate the unit cost of each part, form a technical cost list, and finally obtain the technical cost results; Step S3: Selection of full-process CCUS technical solution; Select appropriate CCUS technologies for each link based on the company's characteristics, determine the technical solutions for each link, analyze technical parameters and engineering workload, and come up with a full-process CCUS technical solution; Step S4: Technical and economic evaluation of the entire CCUS process; Determine the cost composition list of technical methods in each link and conduct cost assessment through preliminary estimate method.

2. The technical and economic evaluation method for a full-process land-sea integrated CO2 geological utilization and storage project according to claim 1 is characterized by: The investment cost calculation method for the full-process CCUS project is as follows: C capi =C capi 1-x +C capi 2-x +C capi 3-x +C capi 4-x ; C capi 1-x =∑P 1-i *Q 1-i (i=1,2,……,n); C capi 2-x =∑P 2-i *Q 2-i (i=1,2,……,n); C capi 3-x =∑P 3-i *Q 3-i (i=1,2,……,n); C capi 4-x =∑P 4-i *Q 4-i (i=1,2,……,n); Where C capi is the investment cost of the full-process CCUS project, C capi 1-x 、C capi 2-x 、C capi 3-x 、C capi 4- x is the investment cost of capture, compression, transportation, and storage, and x is the technical solution selected for each link. One technical solution is selected for each link; P 1-i is the unit price of the i-th investment in the capture technology solution, Q 1-i is the amount of investment in the capture technology option i; P 2-i is the unit price of the i-th investment in the compression technology solution, Q 2-i is the amount of investment in the i-th item of the compression technology solution; P 3-i is the unit price of the i-th investment in the transportation technology solution, Q 3-i is the amount of investment in the transport technology option i; P 4-i is the unit price of the i-th investment in the storage technology solution, Q 4-i The amount of investment in option i for utilizing storage technology; The annual operation and maintenance cost of the full-process CCUS project is calculated as follows: C O&M =C O&M 1-x +C O&M 2-x +C O&M 3-x +C O&M 4-x ; C O&M 1-x =∑P 1-i *Q 1-i (i=1,2,……,n); C O&M 2-x =∑P 2-i *Q 2-i (i=1,2,……,n); C O&M 3-x =∑P 3-i *Q 3-i (i=1,2,……,n); C O&M 4-x =∑P 4-i *Q 4-i (i=1,2,……,n); Where, O&M The annual operation and maintenance cost of the full-process CCUS project is C O&M 1-x 、C O&M 2-x 、C O&M 3-x 、C O&M 4-x are the annual operation and maintenance costs of the capture, compression, transportation, and storage links, respectively; x is the technical solution selected for each link, and one technical solution is selected for each link; P 1-i is the unit price of operation and maintenance of item i of the capture technology solution, Q 1-i is the number of operations and maintenance of the i-th capture technology solution; P 2-i Q is the unit price of the i-th operation and maintenance of the compression technology solution, 2-i is the number of operations and maintenance of item i of the compression technology solution; P 3-i is the unit price of the i-th operation and maintenance of the transportation technology solution, Q 3-i is the number of operations and maintenance of the i-th transportation technology solution; P 4-i Q is the unit price of operation and maintenance of item i using the storage technology solution, 4-i is the number of operations and maintenance items using the storage technology solution item i.

3. A technical and economic assessment tool for a full-process land-sea CO2 geological utilization and storage project, characterized by: It includes data input module A, technical solution module B, cost calculation module C, benefit evaluation module D and feasibility evaluation module E; The data input module A is used to input basic information of the project; Technical Solution Module B evaluates different technical route combinations and analyzes their technical feasibility based on the goals and enterprise characteristics; Cost calculation module C calculates the cost of each chain and the entire chain project using cost assessment methods based on the input data; Benefit Assessment Module D analyzes the project's social and environmental benefits, economic benefits, and risks; The feasibility assessment module E integrates the technical, cost and benefit assessment results to determine the feasibility of the CCUS project.

Images