Technical difficulties and development direction of CO2 injection string in offshore oil and gas fields
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Graphical Abstract
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Abstract
With the acceleration of the pace of domestic green and low-carbon transformation, the offshore oil and gas field CCUS project is getting more and more attention from oil and gas field development workers because it can achieve permanent CO2 injection and increase storage and production through CO2 flooding. Due to limited area of offshore platforms, high cost of well repair operations, and the characteristics of multi-layered development, offshore CO2 flooding projects have put forward new requirements for injection string. CO2 injection string suitable for offshore oil and gas fields should be developed based on the development characteristics of these fields. This paper systematically reviews the development history and technology of CO2 flooding injection string in land oilfield, analyzes the requirements and technical difficulties of offshore injection string, and optimizes the offshore CO2 injection string from the two aspects of underground flow measurement and string safety. The development direction and key contents of CO2 injection string technology are proposed to better support the rapid development of offshore CO2 flooding business.
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