Oil Gas Tank Liquid Level Dynamic

(Note: black stands for the liquid, yellow for the gas, grey for oil and gas mixture)

While the import three-way valve opened for the left separator, export three-way valve opened for right separator. Then liquid level of left separator started to increase. When it reached to setting position, ΔP would be measured.

ΔP=mg/S

M is the mass of liquid column in the separator, g is acceleration of gravity, S is sectional area of separator. The mass of liquid column in the separator can be calculated by this formula and also obtain the flow of well from the change of the mass of liquid column. Control system controls alternate measurement of left and right separator, thus implement continuous measurement of well. After the measurement, intelligent control system is able to calculate the run of oil in the setting time to convert to daily oil production.

Double tank operation， when liquid flows in one tank, the air pressure pushes the liquid in another tank. The system is airtight expect the access channel. Therefore, under the airtight condition, the reduction of the liquid accumulated value of double tank is the gas increment of airtight system. According to the change of tank sectional area and liquid level, the gas flow under current pressure and temperature is able calculated. The gas flow under stander condition can be converted by gas equation.

Double Separation Weighting flowmeter Device is a kind of MFM2000 series multiphase flowmeter with the following characteristics:

• Alternate work of double tanks, achieves continuous metering.
• It adopts integrated design, compact structure and skid mounted structure, so can be used for mobile or fixed equipment.
• It can be applied to the measurement of foam crude oil and some heavy oil wells.
•  The entire measurement process is automatically controlled by the computer.
• The flow metering device can be equipped with RTU and other equipment, to realize remote data transmission and remote monitoring.

1). In view of the defects of large error of heavy oil and foam oil by the conventional volume method, Sanjack company designed and developed a dual-separation weighing measurement device. The modified device has the following characteristics: double tanks work alternately to achieve continuous measurement; adopt an integrated design, compact structure, skid-mounted structure, can be used for mobile or fixed equipment; the entire measurement process is automatically controlled by the computer; the measurement device can be equipped with RTU and other equipment , to achieve remote data transmission and remote monitoring.

2). The main advantage of multiphase flowmeter is that it doesn’t need complete phase separation for the measured oil gas water mixture, the equipment realizes modular design, skid production, simple on-site installation process, compact structure and small space occupation; the measurement range is wide, which can be used for the measurement of individual oil wells, and also for the overall measurement and evaluation of a certain block in the oilfield. At the same time, the measurement process is real-time and continuous measurement, remote communication and remote real-time monitoring can be realized through the network, which can realize unattended without human intervention; automation and instruments have good reliability and applicable accuracy; primary investment and maintenance costs are low, which has great significance in oil production, especially in offshore oil, desert oil fields, remote oil wells and oil well testing The economic benefit of the project is excellent.

Data Sheet of Double Separation Weighting Multiphase FlowMeter Device