Develop A Measuring Instrument For The Crude Oil Sample Moisture Which Based On The Low-energy Rays Absorption Method

In the process of crude oil production, distillation and electric dehydration are two major methods used in crude moisture measurement. Distillation includes procedures as heating, oily water separation, sub sampling and dilution, which bring long testing time and low efficiency; moreover, certain errors may be induced by these procedures. On the other hand, in electric dehydration, oil sample can easily adhere to the container while the indistinct water-oil interface may lead to reading errors as well.Crude oil and water absorption ability is different for two kinds of different low-energy rays. Developing contactless and fast measurement instrument in crude oil moisture based on the character of strong penetration of radiation rays.Measuring the crude oil sample moisture when the crude oil volume and moisture are both changing.59.4KeVγ-ray with americium source and 20-50KeV X-ray by target-shooting are used as radiation source of X and gamma rays, respectively. Signals of two rays are converted to pulse signals to measure the moisture content as well as the thickness of the oil sample. The stability of the system is defined by the error signal of the double-differential discriminator in the spectrum analyser.To measure the crude oil sample moisture of mixing diesel and tap water in laboratory, to measure the crude oil sample moisture in the oil field, this instrument measure a sample takes one minute, compare to the measured value and distillation, error≤2%, the instrument can improve effectively test efficiency and content with demand of test precision when the oil field for settlement of the crude oil output.