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产品展厅>>产品销售>>辰工试井系列软件>>热采试井分析

蒸汽热采导致地层温度变化,从而使得地层中流体性质发生变化,为此需要计算地层及井筒中的温度变化,开展热采试井分析,包括产出剖面及吸汽剖面的解释、焖井压降试井解释及产能预测。

井筒及地层温度方程及其求解

热采导致温度变化以后的井底压力计算:当注入蒸汽时温度产生压力影响,由于地层渗流时温度影响流体的粘度,但温度对流动速度不产生影响(或者影响较小),为此地层的渗流方程保持不变,但井筒压力需要修正。

焖井压降试井解释

考虑温度对焖井压力的影响:由于焖井期间蒸汽参数随温度变化较大,考虑蒸汽的黏度、压缩系数、体积系数等随温度变化。

采用多区域复合模型表示温度大致波及的范围。

可对直井、裂缝井等进行分析。

可考虑双重介质油藏。

可考虑各种边界影响。

图1 井筒和地层温度分布曲线 图2 热采实例

Products>>Products on Sale>>Chengong Well Testing Software  Series>>Thermal Production Well Testing  Analysis

The change of the formation temperature is caused by the thermal production of the steam, so that the fluid property in the formation is changed. So the temperature change in the formation and the wellbore needs to be calculated, and the analysis of the thermal production well testing is carried out, including the interpretation of the production profile and the absorption profile, shut-in pressure drop well testing interpretation and the prediction of the productivity.

Wellbore and formation temperature equation and its solution.

Calculation of bottom hole pressure after temperature change caused by thermal production: When steam is injected, temperature affects pressure. Since the temperature influences the viscosity of the liquid in formation seepage, but temperature has no effect on flow velocity (or has little effect), therefore, the seepage equation of formation remains unchanged, but wellbore pressure needs to be modified.

Shut-in pressure drop well testing interpretation

Consider the effect of temperature on shut-in pressure: Because the steam parameters vary greatly with temperature during shut in, the viscosity, compression coefficient and volume coefficient of steam and so on vary with  temperature should be considered.

The multi-region composite model is used  to represent the approximate range of temperature spread.

Straight well, fracture well and so on can be analyzed.Dual medium reservoir can be considered.Various boundary effects can be considered.

Figure1: Temperature distribution curves of wellbore and   formation Figure2: Thermal production example