Online test system and test method for water content of crude oil

Abstract

The invention discloses an online test system and a test method for the water content of crude oil. The online test system comprises a sampling and measuring barrel, an oil inlet pipe and an electromagnetic conductivity sensor. The oil inlet pipe is provided with control valves, and a crude oil input port is arranged at the bottom of the sampling and measuring barrel and is communicated with oil delivery pipelines via the oil inlet pipe; a heat tracing device for heating the crude oil in the barrel is arranged on the lower portion of the sampling and measuring barrel, a stirring device is arranged inside the sampling and measuring barrel, and an exhaust port is arranged on the top of the sampling and measuring barrel; the electromagnetic conductivity sensor is arranged on the outer wall ofthe sampling and measuring barrel. The online test system and the test method have the advantages that the oil online test system is reasonable in structural design and easy and convenient to operate, and the influence of uncertain factors can be reduced by the heat tracing device and the stirring device during measurement; the reasonable sampling time is set, sampling and comprehensive measurement are carried out in certain time span, and accordingly ultimate water content measurement results have high reference values.

Description

technical field [0001] The invention belongs to the technical field of oil and gas development and testing, in particular to an online testing system and testing method for water content of crude oil. Background technique [0002] At present, most of my country's oil fields have entered the stage of high water-cut exploitation, the difficulty of mining is increasing, and the output is also decreasing year by year. The water content of crude oil is an important data for crude oil production, storage and transportation, and is also an important parameter index for studying the development status of oilfields. Many important oil well information can be predicted through the water content information of crude oil, such as estimating the crude oil production of a single well, predicting the development life of the oil well, etc. A series of measuring equipment or devices are used in petrochemical refining and other production links to realize online real-time monitoring of crude oi...

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Problems solved by technology

[0003] The measurement of crude oil water cut is easily affected by various factors such as oil-water flow state, flow velocity, pressure, temperature, salinity, etc. It is a very complex multivariable nonlinear system, which makes the traditional detection of crude oil water cut have many inherent deficiencies. Defects and constraints also bring large errors to the measurement

[0004] The measurement methods of water content include on-line detection method and offline detection method. The current domestic online crude oil water content detection instruments can be divided into: density method, gamma ray absorption method, microwave absorption method, capacitance method and radio frequency method. These measurement methods have their own advantages and disadvantages, and also have certain limitations. For example, the density method is greatly affected by gas content, crude oil composition, salinity, sand content, scaling, etc.; the gamma ray absorption method has radiation and is expensive The cost of the microwave absorption method is too high, the environmental impact is large, and maintenance is difficult; the scale and wax formation on the electrode surface of the capacitance method is greatly affected by the temperature, and the range is small; the radio frequency method is greatly affected by the interference of environmental stray capacitance; The off-line detection method for measuring the water content of crude oil in the industry generally adopts the distillation method

The sampling time of the distillation method is long, the sampling is random, time-consuming and labor-intensive, and the labor intensity is also high. Moreover, because it uses manual sampling and testing, it cannot reflect the water content of crude oil on-line in real time, and cannot meet the current requirements for the water content of crude oil. Moreover, there is a problem in actual work whether it is online measurement or offline measurement, which is to use "point" (water-containing crude oil sampled at a certain moment) instead of "surface" (a large-scale The water content of crude oil) to calculate the water content of crude oil; in my country's oil exploration, storage and transportation and other production links, the existing detection instruments and devices for the water content of crude oil have been difficult to meet the actual needs of the production site, crude oil water content detection technology and intelligent There is still a lot of room for improvement in the measurement control system

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