DEVICE AND METHOD FOR MEASURING THE FLOW RATE OF OIL WELLS Russian patent published in 2018 - IPC E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for measurement of flow rate of wells. Essence of the invention of a device consists in the fact that a gas pipe in a lower part inside a separator is divided across a section into portions by several siphons of different sections, located along the section in series from the maximum section to the minimum section along the level of the gas pipe from the bottom up, and the end of each siphon is made by hydrocyclones installed at the level from the bottom up in a knockout drum, which in turn is installed in the separator along with the siphon, an annular vessel and a separator. Method consists in determining the flow rate of oil well production by alternately measuring the flow rate of a liquid phase and a gas phase by overlapping the discharge of the gas phase by dividing the gas phase flow into several siphon streams of different flow rates and sections and sequential and alternate their overlap from the maximum flow and section to the minimum flow and section, through the preliminary preparation of the measurement of the flow rate of each siphon – the flow of the gas phase by passing through a hydrocyclone, separation and exclusion of liquid phase droplets from each gas phase flow and their deposition in the separator after the hydrocyclone of the knockout drum. As the liquid level in the separator increases, sequential and alternate overlap of the gas phase with the liquid phase is achieved by mixing the flow of the gas phase with the flow of the liquid phase in each siphon, starting with the maximum flow and siphon section, ending with the minimum flow and siphon section of the gas phase. Subsequent preparation of each flow of the gas phase is carried out mixed with the liquid in the siphon to measure the flow rate of the gas phase by passing each flow through the hydrocyclone, in which the droplets of the liquid phase is separated and excluded from the process of measuring the gas phase flow rate by their deposition in the separator through the hydrocyclone, and subsequently, each siphon is successively filled and overlapped by the liquid phase, starting from the maximum siphon section and the gas phase flow, ending with the minimum siphon section and the gas phase flow rate until the gas phase is completely overlapped of the gas phase release by the liquid phase, completion of the formation of a boundary between the gas and liquid phases, without a gas-liquid phase between them and the beginning of extrusion from the separator and subsequent measurement of the liquid phase, with a drop in the level of the liquid phase in the separator and siphons, a gas breaks out of the separator through siphons, the knockout drum, a measuring line into a production header, the gas phase passes through a flowmeter, shutoff valve, pressure and temperature sensors during the discharge of the gas phase into the production header, the gas phase flow rate is determined taking into account the pressure and temperature, and the flow rate of the liquid is determined taking into account the density meter readings.

EFFECT: technical result is aimed at improving the quality and efficiency of measuring the production rate of oil wells.

2 cl, 1 dwg