一种基于组分闪蒸运算的CO驱动态埋存潜力计算方法

A CO flooding dynamic storage potential calculation method based on compositional flash calculation

高冉 吕成远 周凯 伦增珉 周冰

GAO Ran LYU Chengyuan ZHOU Kai LUN Zengmin ZHOU Bing

中国石化石油勘探开发研究院博士后工作站 中国石化石油勘探开发研究院 中国矿业大学地球科学与测绘工程学院

Postdoctoral Workstation, SINOPEC Exploration & Production Research Institute, Beijing 100083, China SINOPEC Exploration & Production Research Institute, Beijing 100083, China College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China

CO₂驱油与埋存具有经济效应和环保作用，计算CO₂埋存潜力对油藏开发方案设计和安全封存意义重大。已有的潜力计算方法主要针对CO₂的静态埋存潜力进行粗略估算，不能考虑油田的生产实际。为此，提出了一种基于组分闪蒸运算的CO₂驱动态埋存潜力计算方法, 方法基于组分闪蒸运算，考虑了油田的生产实际和CO₂驱的埋存机理，可以计算溶解CO₂、束缚CO₂、自由CO₂和总的CO₂埋存潜力。研究表明：随着埋存时间的增加，会有自由CO₂转变成束缚CO₂和溶解CO₂；经历过水驱开发的油藏，地层水含量高，不能忽略CO₂在地层水中的溶解。基于组分闪蒸运算的CO₂驱动态埋存潜力计算方法可以计算不同种类油藏不同开发方式的动态埋存潜力，方法简单实用且符合生产实际。

CO flooding and storage not only has economic effect, but also plays a role in environmental protection. Calculating CO storage potential is of great significance to the design of oil reservoir development scheme and the safe storage. Existing potential calculation methods mainly estimate CO static storage potential roughly without considering actual oilfield production situations. To this end, this paper put forward a new method to calculate the dynamic storage potential of CO flooding based on compositional flash calculation. This method is based on compositional flash calculation while considering the actual oilfield production situations and the storage mechanisms of CO flooding. It can be used to calculate dissolved CO, trapped CO, free CO and total CO storage potential. It is indicated that with the increase of storage time, free CO will transform into trapped CO and dissolved CO. As for the waterflooding oil reservoirs, the formation water content is high, so the dissolution of CO in formation water shall not be neglected. The CO flooding dynamic storage potential calculation method based on compositional flash calculation is simple, practical and in line with the actual production and it can be used to calculate the dynamic storage potential of different types of oil reservoirs under different development modes.

10.13639/j.odpt.2021.01.011