Liquid level measurement method and apparatus for high-temperature high-pressure oil sample gas-liquid separation tank

The invention relates to a liquid level measurement apparatus for a high-temperature high-pressure oil sample gas-liquid separation tank. The liquid level measurement apparatus comprises an electrode rod and measurement electrodes; the measurement electrodes and a capacitance measuring instrument are connected; and at least two measurement electrodes are installed on the electrode rod successively from top to bottom. In addition, the liquid level measurement apparatus also includes a control unit that is used for receiving a signal from the capacitance measuring instrument and is connected with a drain value of a liquid outlet pipe of the gas-liquid separation tank. The upper measurement electrode and the lower measurement electrode are used for measuring capacitance values of the upper part and the lower part in the gas-liquid separation tank and setting threshold values. On the basis of a measurement ratio of the upper measurement electrode and the lower measurement electrode, location in a gaseous-phase or liquid-phase environment is determined; and when the upper measurement electrode is located in the liquid-phase environment, a liquid discharging signal is sent to the drain valve. The apparatus can carry out measurement on the oil sample liquid level of the system during the petroleum processing; the stability is high; limitation of the ropy characteristic of the oil sample and the quality of the oil sample can be avoided; the apparatus has the good using performance under high temperature and high pressure; and the stable operation of the apparatus can be guaranteed.