(398f) Ccus Development in Middle China

China has been the second largest CO₂ emitter because the economic boom during the last 20 years. As a consequence, the controls of CO₂ emissions has become more and more important. To realize both the reduction of CO₂ emissions and enhanced oil recovery, several CCUS pilots were built in Ordos Basin which is located in middle China.

Ordos Basin is one of the largest urban agglomerations which can be regarded as the most important industrial center in middle China. Coal industry, oil refinery and steelworks are the pillar industries of Ordos Basin which can emit a large amount of CO₂. Besides, there has natural continental trap structure underground in Ordos Basin which is a geological structure that is suitable for generating and storing oil. These two reasons provided conditions for the development of CCUS in this region.

CCUS contains 3 parts: capture, transport and storage (besides utilization which is EOR in Ordos Basin). In capture part, we researched five different capture methods, including solid amine, ammonia solution, TSA (temperature swing adsorption), PSA (pressure swing adsorption) and membrane separation. Finally, considering various factors, the low-temperature methanol-wash and ammonia solution were proved to be the most suitable methods for the CO₂capture in Ordos Basin.

In transport part, we designed a transportation plan inspired by the transmission network: First, we set up several transfer stations among adjacent emission sources and connect them with branch pipelines. Pretreatment will be done in the transfer stations to unify the pressure, the temperature and the ingredient of CO₂. After that, CO₂ will be injected into the main pipeline and transported to another transfer station in supercritical. The target transfer station is close to storage locations and the supercritical CO₂ will be transformed into the status that is suitable for geological storage and EOR here. At last, CO₂ will be injected into the underground through another branch pipeline.

CO₂ underground storage suitability evaluation, the evaluation of crust stability and the suitability evaluation of reservoirs are necessary in storage part. We collected stratigraphic data and reservoir information, selected evaluation systems to finish the research. Finally, Qiaojiawa block of Jingbian oilfield, Wuqi oil-groove block of Wuqi oilfield and Tangshan block of Dingbian oilfield were proved to be the most suitable places for CO₂ underground storage and EOR. In addition, CO₂ storage potential and EOR effect will be predicted.

At last, several details of the pilots` operation status will be introduced.