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为有效抑制天然气管道中水合物的形成,根据流体在多层圆筒壁圆管中流动的传热学理论,综合考虑大地温度变化、天然气物性参数等多方面因素的影响,给出电伴热埋地天然气管道热力计算的数值方法与计算公式,并应用于现场计算。在气井的井口温度一定的条件下,管道缠有电伴热带的出口温度明显升高,且温度升高的最小值为3.8℃,最大值达19.8℃,计算结果与现场实测结果的相对误差小于5%,表明所推导的温降计算公式和编制的计算软件完全能够满足油田生产的要求。
In order to effectively suppress the formation of hydrate in natural gas pipeline, according to the heat transfer theory of fluid flowing in the multi-layer cylindrical tube, considering the influence of many factors such as the change of the earth’s temperature and the physical parameters of natural gas, Buried natural gas pipeline thermal calculation of numerical methods and formulas, and applied to the field calculation. Under the wellhead temperature of gas well, the outlet temperature of entwined enthalpy is obviously increased, and the minimum temperature rise is 3.8 ℃ and the maximum value reaches 19.8 ℃. The relative error between calculation results and field measurements is less than 5%, indicating that the derived temperature drop calculation formula and the preparation of the calculation software can fully meet the requirements of oilfield production.