Precession vortex flow meter for heavy oil measurement

Abstract: The information on heavy oil measurement by precession vortex flowmeter is provided by excellent flowmeter and flowmeter manufacturers. 1 Introduction The membrane wheel and Roots flowmeters widely used in domestic crude oil measuring instruments are flowmeters with rotating parts. These flowmeters have many problems in online metering of high-viscosity crude oil. Due to the serious sand production of heavy oil, the flowmeter with rotating parts is easy to get stuck, correspondingly. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the heavy oil measurement by the precession vortex flowmeter. 1 Introduction The membrane wheel and Roots flowmeters widely used in domestic crude oil measuring instruments are flowmeters with rotating parts. These flowmeters have many problems in online metering of high-viscosity crude oil. Due to the serious sand production of heavy oil, the flowmeter with rotating parts is easy to get stuck, the corresponding maintenance workload is large, and the operating cost is high. Although the ultrasonic flowmeter has no rotating parts, due to the limited measurement range, it can only measure pure medium, easily conductive sewage or clean water, and cannot measure dry and heavy crude oil with poor conductivity, so it is not suitable for heavy oil measurement. Although the mass flowmeter has high measurement accuracy, because the heavy oil is exploited by steam injection, the liquid entering the metering device contains a large amount of steam, which often affects the measurement of heavy oil, and the instrument is expensive. In response to these problems, heavy oil companies The precession vortex flowmeter was jointly tested and developed with Xi'an AVIC Flow Technology Research Institute on the basis of the measurement of the annual division line. The precession vortex flowmeter has no rotating parts. It is a differential pressure flow measurement instrument. The secondary instrument adopts the single-chip technology, which reduces the measurement cost of the team and the line. The flowmeter has a simple structure, convenient maintenance, and small measurement difference. Meet heavy oil measurement requirements. In 2006, 2 units were tested in the 92# station, and 5 units were promoted and applied in the newly built six-zone heavy oil treatment station in 2008, and achieved good results. 2. Heavy oil measurement conditions (1) Heavy oil measurement characteristics The viscosity is 2000~100000mPa.s (20℃), and the density of crude oil is 0.92-0.98g/cm', the average water content is 87%, the oil field is seriously flooded with hot steam and sand is produced, causing heavy oil to carry sand and impurities into the aggregate treatment system. (2) Measurement status of heavy oil The heavy oil recovery process adopts the method of two-level station layout, and the advanced metering station of oil well produced fluid is 60m away.'The tank is then rushed to the crude oil processing station by the tank oil pump of the metering station, which will inevitably cause uneven liquid flow from the crude oil processing station. In the design of the heavy oil treatment station, the selection of the metering instrument is still in accordance with the thin oil design standard, and the selected flowmeter is a positive displacement flowmeter. This flowmeter mainly uses the energy generated when the medium flows to drive the flowmeter to count. The flowmeter The most important bearing lubrication method is self-lubricating method, which can easily cause the flowmeter to be stuck by impurities carried by heavy oil or the bearing is eccentrically worn, causing the flowmeter to stop running. The properties of heavy oil reservoirs (poor reservoir cementation, severe sand production) and oil properties (high viscosity and high naphthenic content) determine that the measurement of heavy oil cannot be measured by conventional rotating measuring instruments, such as Roots, Waistwheel and other flowmeters. High steam injection intensity will cause serious sand production in oil wells. Moreover, heavy oil has strong sand-carrying ability, bringing sand from the wellhead to the surface and passing through the single-well pipeline.→60m'Can→Pump→oil collection line→Entering the crude oil processing station, at this time, the sand is fine silt and heavy oil, which is easy to cause sand stuck. In order to prevent sand sticking, a filter with a denser mesh is selected and installed in the filter in front of the flowmeter to remove sand. However, because the travel net is too fine, even the heavy oil cannot pass through, causing the pipeline pressure and affecting the normal production. To this end, the heavy oil company has successively used centrifugal flowmeters and mass flowmeters for crude oil measurement, but because centrifugal flowmeters have not solved the problem of sand plugging of pressure guiding pipes, they have not been used. Mass flowmeter can solve the problem of heavy oil sub-line measurement, but due to the high dryness of heavy oil, in order to improve the oil recovery effect, sometimes the oil production team mixes a small amount of steam in the oil production pipeline, and this part of the steam reaches the crude oil processing station and affects the mass flowmeter. If the steam volume exceeds 10% in a short time, the mass meter will not be able to measure normally. Therefore, in the selection of heavy oil measuring instruments, it is necessary to consider that heavy oil is produced in an open process and pumped crude oil. The oil production area has uneven liquid flow, large fluctuation, large dryness, high temperature, serious sand production in oil wells, and high water content. Features for instrument selection. 3. The selection of intelligent precession vortex flowmeter has the following characteristics: (1) It has a wide range of measurement functions. (2) The precession vortex flowmeter, in the process of flow measurement, can quickly track the change of the working condition of the fluid, correctly complete the detection and calculation of the relevant parameters, automatically correct the flow measurement deviation, and accurately measure the crude oil flow. (3) The working surface of the precession vortex flowmeter is a smooth arc surface, which has the ability to pass small solid substances through its throat diameter, is not easy to wear, has no rotating parts, has a firm structure and has a long service life.

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