Investigation on the Relationship between Wellhead Injection Pressure and Injection Rate for Practical Injection Control in CO2 Geological Storage Projects
Investigation on the Relationship between Wellhead Injection Pressure and Injection Rate for Practical Injection Control in CO2 Geological Storage Projects
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CO2地质封存工程实际注入控制井口注入压力与注入速度关系研究
DOI：
10.1155/2018/4927415
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发表时间：
2018-06
期刊：
影响因子：
1.7
通讯作者：
Li Xiaochun
中科院分区：
文献类型：
--
作者：
Bai Bing;Wu Haiqing;Li Xiaochun
现有的对井口最大允许注入压力的研究已经找到了井口注入压力的上限，但这并不能为二氧化碳地质封存项目提供实际的井口注入参数设计方案。因此，本工作首先提出井筒注入的完整约束条件，实现井筒压力正逆计算的全过程，然后应用该条件探索井口注入压力与注入速率的关系。结果表明，井口注入压力与注入速度是一对相互约束的物理量。对于某一注入工程，允许井口注入压力和注入速度分别形成一个连续的区间。当一个量在其允许区间内发生变化时，另一个量也会在其允许区间内发生变化，两者共同形成一个封闭区域。因此，控制该封闭区域的井口注入参数，可以同时保证注入的有效性和安全性。随后，本工作进一步研究了影响井口注入压力与注入速率关系的因素，发现所有注入流体温度、饱和度参数、储层特征参数只是在一定程度上改变了它们的上下限，而对它们的关系没有实质影响。将该理论和方法应用于神华CCS示范项目，得到了井口注入压力与注入速率的关系图，发现其实际注入参数正好处于关系图的封闭区域，有效验证了该工作的可靠性。
The existing investigations on the maximum allowable wellhead injection pressure have found the upper limit of wellhead injection pressure, which, however, cannot provide a practical operational designing scheme of wellhead injection parameters for CO2 geological storage projects. Therefore, this work firstly proposes the complete constraint conditions of wellbore injection to realize the whole process of forward and inverse calculations of wellbore pressure and then applies it to explore the relationship between wellhead injection pressure and injection rate. The results show that the wellhead injection pressure and the injection rate are a pair of mutually constrained physical quantities. For a certain injection project, the allowable wellhead injection pressure and injection rate separately form a continuous interval. Change of one quantity within its allowable interval will also change the other within its interval, both jointly forming a closed region. Thus, controlling the wellhead injection parameters in this closed region can simultaneously ensure the effectiveness and safety of injection. Subsequently, this work further studies the factors of impacting the relationship between wellhead injection pressure and injection rate and finds that all the temperature of injected fluid, the parameters of saturation, and the characteristic parameters of reservoirs only change their upper and lower limits to some extent but have no essential effects on their relationship. Application of this theory and method in Shenhua CCS demonstration project obtained the relationship diagram of wellhead injection pressure and injection rate, which found that its actual injection parameters just fall into the closed region of the relationship diagram, effectively verifying the reliability of this work.
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DOI：
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发表时间：
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期刊：
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