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油田现场实测井筒温度分布曲线表明,当井底液体沿井筒向上运动时,井筒内温度逐渐降低,当运行至产液层段,由于产层内液体流入,液体之间发生热交换,导致温度发生改变。其温度变化幅度的大小与各层的产量及含水有关。根据这一原理,提出了一种利用井筒内温度分布曲线,进行分层求产的新方法:将整个井筒内温度变化划分为3个过程,分析每个过程温度变化原理,考虑井筒内流体与油、套管和地层之间的热传递,根据能量守恒定律,建立井筒内温度分布的理论数学模型,并进行求解。当已知实测井筒温度分布时,将模型进行转换,反推出每个过程中产液量和含水的隐函数,并利用现场实测井数据对所建立的数学模型进行校正。目前该方法已经在大庆油田成功应用。现场应用表明,计算得到的各层产量和含水率与实际测试数据相对误差在15%以内。该研究为油田提供了一种简便、准确的分层求产方法,但目前只能应用于层间跨距较大的井。
The field measured wellbore temperature distribution curve shows that when the bottom hole liquid moves upward along the wellbore, the temperature in the wellbore gradually decreases. When the liquid layer flows into the production zone due to the inflow of the liquid in the production zone, the temperature occurs between the liquids change. The magnitude of its temperature change is related to the yield and water content of each layer. According to this principle, a new method for stratification production is put forward by using the temperature distribution curve inside the wellbore. The temperature change in the whole wellbore is divided into three processes. The principle of temperature change in each process is analyzed. According to the law of conservation of energy, a mathematical model of temperature distribution in the wellbore is established and solved. When the measured wellbore temperature distribution is known, the model is transformed, the implicit function of fluid production and water content in each process is deduced, and the mathematical model established is calibrated by field well logging data. At present, the method has been successfully applied in Daqing Oilfield. The field application shows that the relative error between the calculated yield and moisture content of each layer and the actual test data is less than 15%. The study provides a simple and accurate method for stratification of production in oilfields, but it is currently only applied to wells with large interlayer spans.