水平气井内温度分布影响因素的实验研究

为了建立利用水平气井温度数据定量解释产出剖面的解释模型,需要对水平井温度分布的影响因素进行分析评价。通过室内气液两相流实验平台,研究了产气量、产液量、射孔簇开孔方式、井筒倾角、重力场等因素对井筒温度分布的影响规律。结果表明:单相气和气液两相由射孔簇进入井筒后都会出现焦耳-汤姆逊效应,气量越大,井筒内温度越低,液量越大,井筒内的温降效应越弱;相同条件下,射孔数目越多,流量-温度曲线越平缓,射孔分布越均匀,井筒内温度分布越平缓;气液两相流时管道倾角对温度分布的影响大于单相气时的影响;由于重力作用,同一横截面上温度存在偏差。研究结果丰富了水平井温度分布规律的认识,为利用温度数据解释产出剖面的解释模型建立提供指导,具有重要的工程应用价值和学术意义。

Experimental study on influence factors of temperature distribution in horizontal gas well

In order to establish the model of shale gas production based on horizontal well temperature profile interpretation, the influencing factors of temperature distribution in the wellbore were studied by laboratory experiments. The gas volume, liquid volume, perforation distribution, wellbore inclination and gravity field on the temperature distribution in the horizontal wellbore were studied. The results show that the Joule-Thomson effect occurs when the single-phase gas and the gas-liquid two-phase enter the wellbore from the jet-hole cluster. Under the same conditions, the larger the gas volume, the lower the temperature in the wellbore, while the larger the liquid volume, the weaker the temperature dropping in the wellbore. Under the same conditions, the more perforation, the smoother the flow-temperature curve, the more uniform the perforation distribution, the more gentle the temperature distribution in the wellbore. The influence of the pipe inclination on the temperature distribution for gas-liquid two-phase flow is greater than that of the single-gas flow. Due to the influence of gravity, in the case of single-phase gas, the temperature of a same cross-section is also not uniform. The conclusions of this paper can enrich the understanding of the temperature distribution in horizontal gas wells, and provide a basis for the establishment of gas production model based on temperature profile interpretation, which has great value for engineering and theory.