UKCCSRC Call 2 project poster: The Development and Demonstration of Best Practice Guidelines for the Safe Start-up Injection of CO2, CSLF Call project poster reception, London, 27.06.16

This poster on the UKCCSRC Call 2 project The Development and Demonstration of Best Practice Guidelines for the Safe Start-up Injection of CO2 into Depleted Gas Fields was presented at the CSLF Call project poster reception, London, 27.06.16. Grant number: UKCCSRC-C2-183. Highly-depleted gas fields represent prime potential targets for large-scale storage of captured CO2 emitted from industrial sources and fossil-fuel power plants. Given the potentially low reservoir pressures as well as the unique thermodynamic properties of CO2, especially in the presence of the various stream impurities, the injection process presents significant safety and operational challenges. In particular, the start-up injection leads to the following risks: • blockage due to hydrate and ice formation following the contact of the cold CO2 with the interstitial water around the wellbore; • thermal stress shocking of the wellbore casing steel, leading to its fracture and ultimately escape of CO2; • over-pressurisation accompanied by CO2 backflow into the injection system due to the violent evaporation of the superheated liquid CO2 upon entry into the wellbore.

本海报介绍了英国碳捕获与封存研究中心（UKCCSRC）第二阶段项目——《富油气田二氧化碳安全注入最佳实践指南的开发与示范》的研究成果，该成果于2016年6月27日在伦敦的CSLF项目海报招待会上展出。项目资助编号：UKCCSRC-C2-183。高度贫化气田作为工业源和化石燃料发电厂捕获的二氧化碳大规模储存的理想目标，具有极高的潜力。鉴于储层压力可能较低以及二氧化碳独特的热力学性质，尤其是在与井筒周围孔隙水的各种杂质接触时，注入过程面临着重大的安全与操作挑战。特别是启动注入可能导致以下风险：①冷二氧化碳与井筒周围孔隙水接触后，由于水合物的形成和冰的生成，可能导致堵塞；②高温液体二氧化碳进入井筒时，对井筒套管钢的热应力冲击，可能导致其断裂，进而导致二氧化碳泄漏；③由于超热液体二氧化碳的剧烈蒸发，导致注入系统压力过高，并伴随二氧化碳回流至注入系统。