A New Thermal Fluid Coupling Temperature Inversion for the Formation Characteristics of High-Yield Wells
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摘要:
高探1井试油时，井底流体温度随着产量增大而升高，而现有测试资料分析方法无法解释该现象。为此，根据质量和能量守恒方程，考虑高温流体在地层中的渗流规律和在井筒内的流动规律、渗流和流动时的传热，建立了储层和井筒的热流耦合模型，利用该模型分析了温度瞬态数据，反演了高产井地层温度。高探1井的生产压力和温度数据反演结果表明，反演得到的温度曲线与实测温度曲线吻合良好，可以解释井底流体温度随产量升高的现象。研究表明，高产井地层特征温度反演方法能够定量分析地层热力学和渗流参数、确定高产井流体的产出位置，为生产管柱安全评价、现场生产决策、油藏认识和储量计算提供了理论依据。
Abstract:It was found during the oil test of Well Gaotan-1 that the temperature of bottomhole fluids increased with production, which cannot be explained by existing test data and analysis methods. Therefore, based on the conservation equations of mass and energy and according to the seepage flow law of high-temperature fluid in the formation, the flow law in the wellbore and the heat transfer during the seepage and flow, a model of thermal flow coupling between the wellbore and reservoir was established, and a method for inversion of formation temperature in high-yield wells was proposed by analyzing transient temperature data. This method was used to invert the production pressure and temperature data of Well Gaotan-1, and the temperature curve of the inversion was highly consistent with the measured temperature curve of Well Gaotan-1, which explained the phenomenon that the bottomhole fluid temperature increased with the production. The study indicated that the proposed new method for the inversion of formation characteristic and temperature of high-yield wells could quantitatively analyze the formation thermodynamics and seepage parameters, and in that way, determine the fluids producing location of high-yield wells, and provide important basis for production string safety appraisal, field production decision-making, reservoir recognition and reserves calculation.
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Key words:
- high-yield well /
- thermal flow /
- coupling /
- temperature /
- inversion /
- mathematical model /
- Well Gaotan-1
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图 3 典型烃混合物的Joule-Thomson效应
Figure 3. Joule-Thomson effect of typical hydrocarbons mixture
图 5 高探1井井底流体温度与产量关系的拟合曲线
Figure 5. Fitting curve of relationship between bottomhole fluid temperature and production in Well Gaotan-1
图 6 高探1井关井后的井底温度–压力曲线
Figure 6. Bottomhole temperature-pressure curve after shut-in of Well Gaotan-1
图 7 反演双对数温度曲线及其导数曲线与实测双对数温度曲线及其导数曲线的拟合
Figure 7. Fitting of inversed double logarithmic temperature curve and its derivative curve with measured double logarithmic temperature curve and its derivative curve
表 1 不同产量下井底流体温度的预测值与实测值对比
Table 1. Comparison on the predicted and measured values of bottomhole fluid temperature at different yields
产量/（m3·d–1） 井底流体温度/℃ 相对误差，% 实测 预测 398.70 147.192 148.103 0.619 511.00 149.357 150.004 0.433 619.10 151.557 151.834 0.183 676.80 153.408 152.811 0.389 809.28 155.851 155.054 0.511 
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