Interface level measurement is very important for oil and gas, chemical tanks. At the same time, Interface level measurement is also a measurement and control challenge.
In today’s increasingly modernized oilfield production, automated crude oil processing has become a guarantee for the quality of refined oil. The performance of the oil-water interface fundamentally affects several key issues in crude oil processing: the water content of crude oil, energy consumption, sewage discharge indicators, etc.
Here we mainly compare the working principle, usage and common failures of several oil-water interface instruments commonly used in North China Oilfield. Hope to help you find a suitable solution when measuring oil-water interface.
Interface level measurement technologies
According to the different measurement principles of the interface instrument, the interface instrument can be roughly divided into: magnetic radio frequency admittance type, short wave absorption type, capacitive type, servo type and so on.
Among them, the magnetic interface instrument is divided into: reed tube type magnetron interface instrument, magnetostrictive interface instrument and other forms.
Interface level measurement using Capacitive
Capacitive interface meter uses the difference in electrical conductivity between oil and water media to make the capacitance and the height of the water have a linear relationship. To achieve the purpose of monitoring the oil-water interface.
Nowadays, radio frequency admittance type is used to replace the traditional capacitive interface instrument.
Capacitive Level Sensors can be used for point level detection and continuous level measurement, particularly in liquids. The measuring principle is based on the change of the capacitance in a capacitor. The electrically conductive tank wall and a probe inside of the tank form a capacitor, The capacity changes of which are used to determine the level. This animation shows the measuring principle in conductive liquids and non-conductive liquids. The Capacitive Level Sensor can convert the changes of various levels and the height of the liquid level into standard current signals. Level Sensors can also support wireless transmission, RS485 digital communication transmission, etc.
Read more about: 7 Level Senors for Tank Level Measurement
In oil field production, oil-water separation is an extremely important link in crude oil processing. After the crude oil enters the joint station, it has to go through treatment processes such as sedimentation and power-off. Oil-water interface control is the key to the separation effect.
Nowadays, oilfields generally use special oil-water interface meters to monitor the process. To achieve the purpose of automatic control.
At present, there are many types of oil-water interface instruments. The performance difference is relatively large. Based on the actual situation of the North China Oilfield, the use of the interface instrument is specifically analyzed.
First, give a general introduction to the basic process flow of oilfield production. After the crude oil is extracted, it is sent to the oil production metering station for measurement, and then enters the joint station.
At the joint station, after metering and heating, the crude oil is sent to the primary settling tank. The crude oil in the primary sedimentation tank is kept at about 60°C all year round.
After sedimentation and separation, it is sent to the intermediate tank. After dehydration pump dehydration. After secondary heating, it enters the secondary settling tank.
The crude oil in the secondary settling tank is kept at about 80℃ all year round. The separated crude oil enters the electric dehydrator for final treatment. After reaching the moisture content standard (0.5%). Finally, it is sent to the refined oil storage tank.
In the whole process, it is necessary to measure the oil-water interface. The accurate monitoring of the oil-water interface is critical to the recovery of water content of oil products and the cost of treatment.
Extended reading: Magnetostrictive Hydraulic Cylinder Position Sensor
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Extended reading: Water Tank Level Controller
Sino-Inst offers over 10 Solutions for Oil-water Interface Level Measurement. About 50% of these are interface liquid level meters, 40% is the level switches.
A wide variety of Solutions for Oil-water Interface Level Measurement options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of Solutions for Liquid Level Measurement instrumentation, located in China.
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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
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