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在油气生产井的多相流动中,通常利用电容法含水率计识别水和油气混合物。本文从仪器结构及测量原理出发,认为仪器的测量电容(C)与持水率(Y_w)之间的响应关系受地层水矿化度及分布状态制约,高矿化度时,仪器在泡状流动中将失去分辨水和油气混合物的能力。本文提出了新的响应方程,并指出,取样式电容法含水率计是一种很有发展前途的仪器,所给出的实验数据证实了上述观点。取样式电容法含水率计适用于淡水也适用于盐水,其仪器响应与持水率呈线性关系,但测量时间应大于稳定时间。
In multiphase flow in oil and gas production wells, capacitance water cut-off meters are commonly used to identify water and oil-gas mixtures. In this paper, starting from the structure of the instrument and the principle of measurement, it is considered that the response relationship between the measured capacitance (C) and water holding capacity (Y_w) of the instrument is controlled by the salinity and distribution of formation water. When the mineralization degree is high, Flow will lose the ability to distinguish between water and oil and gas mixtures. In this paper, a new response equation is proposed. It is pointed out that the moisture content meter is a very promising instrument. The experimental data provided confirm this view. Take the sample capacitance method moisture meter for fresh water is also suitable for salt water, the instrument response and water retention was linear, but the measurement time should be greater than the stabilization time.