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刘军,男,1986年生,高级工程师,主要从事地热开发领域研究。E-mail:liujun02@cnnp.com.cn |
收稿日期: 2025-03-26
修回日期: 2025-04-12
网络出版日期: 2025-11-06
基金资助
国家自然科学基金项目(U2344226)
国家自然科学基金项目(42472364)
中国核工业集团有限公司集中研发项目“地热勘查开发利用关键技术研究”
Determination of CO2 content in high-temperature geothermal reservoirs: A combined method of temperature-flow pressure well testing and two-phase flow simulation
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LIU Jun,male,born in 1986,senior engineer,focusing on geothermal development. E-mail:liujun02@cnnp.com.cn |
Received date: 2025-03-26
Revised date: 2025-04-12
Online published: 2025-11-06
Supported by
National Natural Science Foundation of China(U2344226)
National Natural Science Foundation of China(42472364)
CNNC’s centralized R & D project “Research on Key Technologies of geothermal exploration, development and utilization”
CO2是高温地热流体中非凝析气的主要组分,其对地热开发产生重要的影响,确定其在高温地热流体中的含量对地热开发和相关建设具有重要的意义。常规取样测试分析确定CO2含量存在取样代表性不足、实施过程繁琐和取样成本高的问题。提出了联合产能测试中井筒温度-流压试井和两相流动计算确定CO2含量的方法,由于该方法仅利用了相对可靠的温度和压力实测数据,成本低、实用性强和可靠性较好。首先,描述了放喷过程中的井筒温度和压力的测试流程和建立了井筒两相流动模型,然后与商业软件WELLSIM对比验证了其可靠性,其次联合测试和模型建立了CO2含量确定方法,最后该方法应用到西藏谷露和土耳其孜勒代尔地热田,确定了地热储层中CO2质量分数分别为1.1 %和3.2 %。
刘军 , 雷宏武 , 孙国强 , 谢迎春 , 白冰 . 高温地热储层中CO2含量的确定——温度-流压试井和两相流模拟联合方法[J]. 世界核地质科学, 2025 , 42(3) : 607 -618 . DOI: 10.3969/j.issn.1672-0636.2025.03.011
CO2 is the main component of non-condensable gas in high-temperature geothermal fluid and its existence still have important impact on geothermal development. Determining its content in high-temperature geothermal fluid is of great significance for geothermal development. The conventional sampling and testing analysis of CO2 content determination has some drawbacks, such as insufficient sampling representativeness,cumbersome implementation process and high sampling cost. Based on the pressure-temperature measurement in the wellbore during discharge tests and two-phase flow calculation, this paper proposed a new method to determine CO2 content in the geothermal reservoirs. This method only uses a large number of relatively reliable measured data of temperature and pressure, it has low cost, strong practicability and good reliability. This paper first describes the pressure-temperature measurement during discharge tests. Then constructs a model that solves the two-phase flow in the geothermal wellbore, which was verified by comparison with the commercial software WELLSIM, and determine CO2 content by using both the wellbore pressure-temperature measurement and model calculation data. Finally, the method was tested and verified by using the measured data from Gulu geothermal field in Tibet and the Ziledaer geothermal field in Turkey, and the CO2 contents in the geothermal reservoir were determined to be 1.1 % and 3.2 % respectively.
表1 西藏谷露地热田井筒两相流动计算输入参数Table 1 Input parameters for two-phase flow calculation in the Gulu geothermal field |
| 模型参数 | 取值 |
|---|---|
| 井筒直径/m | 0.22 |
| 井筒套管长度/m | 435 |
| 套管底部位置压力/MPa | 4.34 |
| 套管底部位置温度/℃ | 188.1 |
| 质量速率/(kg·s-1) | 86.94 |
| 套管底部位置CO2质量分数 | 反演 |
| 套管摩擦系数/m | 4.5×10-5 |
图5 谷露地热田不同CO2含量计算与测量相对误差Fig. 5 Relative error for different CO2 content between calculations and measurements in the Gulu geothermal field |
表2 土耳其克孜勒代尔地热田井筒两相流动计算输入参数Table 2 Input parameters for two-phase flow calculation in the Kizildere geothermal filed,Turkey |
| 模型参数 | 取值 |
|---|---|
| 井筒直径/m | 0.24 |
| 井筒套管长度/m | 2 195 |
| 套管底部位置压力/MPa | 17.7 |
| 套管底部位置温度/℃ | 237 |
| 质量速率/(kg·s-1) | 49.4 |
| 套管底部位置CO2质量分数 | 反演 |
| 套管摩擦系数/m | 4.5×10-5 |
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