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在高温热田的井孔施工及测试实践中,通常由于高温热水在地层或井简内闪蒸汽化,形成复杂的两相流动而无法直接从单井放喷资料中计算地层参数。 西藏羊八井属于高温热水型地热田,第四系热储内热液温度约介于140—155℃之间,埋藏深度大略为70—200米左右,井口闭井压力大多在2—4个大气压之间。热储流体在上述深度、温度和压力的配置下,在地层内处于单相液态,而在开发动态下则在大部分井筒上部达到饱和点而汽化,形成相对稳定的汽化面,构成双相流和单相流之间的界
In the wellbore construction and testing practice of high-temperature thermal fields, formation parameters are usually not calculated directly from single well blowdown data due to the high temperature hot water flashing in the formation or wellbore to form a complex two-phase flow. Yangbajing, Tibet belongs to the high-temperature hot water geothermal field. The temperature of thermal fluid in the Quaternary thermal reservoir is between 140-155 ℃, the buried depth is about 70-200m, and the pressure of wellhead closure is mostly 2-4 Between atmospheric pressure. Under the above configuration of depth, temperature and pressure, the thermal storage fluid is in a single-phase liquid in the formation, and reaches the saturation point in most of the wellbores during development to be vaporized to form a relatively stable vaporization surface and form a dual-phase flow And single-phase flow between the boundaries