0 引言
1 模拟计算依据
1.1 质量和能量守恒
1.2 单相流压降
1.3 两相流压降
1.4 求解方法
1.5 模型验证
Table 1 Parameter list used for calculation表1 计算参数表 |
参数 | 单位 | 数值 |
---|---|---|
井底压力 | bar | 75 |
井底温度 | ℃ | 260 |
质量流量 | kg/s | 50 |
井筒直径 | m | 0.2 |
井深 | m | 1 500 |
井管表面粗糙度 | m | 4.6×10-5 |
二氧化碳质量含量 | % | 0.5 |
1.6 热储特性模拟
2 结果及分析
2.1 质量流量的影响
Fig. 1 (a) Relationship between mass flow rate and wellhead pressure; (b) variation of flashing depth with mass flow rate; (c) variation of wellhead temperature, CO2 partial pressure and dryness with mass flow rate图1 (a)质量流量与井口压力的关系;(b)质量流量与闪蒸深度的关系;(c)井口温度、二氧化碳分压和干度与质量流量的关系 |
Fig. 2 (a) Variation of pressure and temperature with depth; (b) variation of dryness with depth; (c) variation of total pressure, partial pressure and temperature with depth图2 (a)流体压力和温度随深度的变化;(b)流体干度随深度的变化;(c)总压、分压和温度随深度的变化 |
2.2 二氧化碳含量
Fig. 3 (a) Effect of CO2 content on wellhead dryness and flashing depth; (b) effect of CO2 content on wellhead temperature, pressure and CO2 partial pressure; (c) variation of temperature with depth and CO2 content图3 (a)CO2质量含量对井口干度和闪蒸深度的影响;(b)CO2质量含量对井口温度、压力和二氧化碳分压的影响;(c)不同CO2含量条件下,流体温度随深度的变化 |
2.3 热储温度和压力
Fig. 4 (a) Variation of wellhead temperature, pressure and flashing depth with reservoir temperature; (b) relationship of wellhead pressure and CO2 partial pressure with reservoir pressure; (c) effect of reservoir pressure on wellhead dryness, temperature and flashing depth图4 (a)井口温度、压力和闪蒸深度与热储温度的关系;(b)井口压力和CO2分压与热储压力的关系;(c)热储压力对井口干度、温度和闪蒸深度的影响 |
2.4 井管表面粗糙度
Fig. 5 (a) Relationship of wellhead pressure and flashing depth with the surface roughness of well tube; (b) relationship of wellhead temperature and dryness with the surface roughness of well tube图5 (a)井口压力和闪蒸深度与井管表面粗糙度的关系;(b)井口温度和干度与井管表面粗糙度的关系 |
2.5 结垢厚度和结垢长度的影响
Fig. 6 (a) Effect of scale thickness on wellhead pressure; (b) effect of scale length on wellhead pressure图6 (a)结垢厚度对井口压力的影响;(b)结垢长度对井口压力的影响 |