Crude oil water content on-line detection device and method for preventing oil deposition and wax deposition

Abstract

The invention relates to an online detection device for moisture content of crude oil and a method for preventing oily wax deposits. The online detection device includes a probe, a meter head and a meter connector. The meter connector connects the meter head and the probe and seals the probe. Installed on the pipeline, the probe body in the pipeline is equipped with upper and lower layers of microwave detection lines, and is connected to two sets of microwave detection units on the high-frequency circuit board. The microwave detection unit includes a microwave signal generator and a phase comparator; the probe body is on the There is a heating device between the upper and lower microwave detection lines, an upper layer temperature sensor is installed above the upper layer microwave detection line, and a lower layer temperature sensor is installed below the lower layer microwave detection line; the probe body is also equipped with an oil temperature sensor. , the heating device, the upper temperature sensor and the lower temperature sensor are all connected to the main circuit board; the anti-oil wax method is carried out through the cycle of detection, prevention, detection, and removal, so as to prevent oil wax and reduce the function as much as possible. consumption purpose.

Description

technical field [0001] The invention belongs to the field of on-line detection, and in particular relates to an on-line detection device for the water content of crude oil for preventing overburden oil and wax deposition and a method for preventing overburden oil deposition and wax deposition. Background technique [0002] Online detection of water content of crude oil is a worldwide problem, especially for heavy oil or crude oil with high wax content, online detection is even more difficult. Many methods currently used in oil fields, such as resistivity method, capacitance method, radio frequency attenuation method and microwave method, the probes of these sensors are easily covered by heavy oil or wax deposits, resulting in increased measurement error or even failure. [0003] Heavy oil and wax deposits not only have an impact on online instruments, but also have long-term effects on pipeline transportation, especially in winter, causing oilfields to take viscosity reducti...

AI Technical Summary

Problems solved by technology

After taking these measures, the oil-covered and wax deposits in the crude oil pipeline can be removed, but after a long time after the measures are completed, the oil-covered and wax deposits will be caused again.

[0004] In addition, for sensors that are prone to oil and wax deposits, some manufacturers use mechanical devices to regularly erase the probes, but the mechanical structure is complicated, mechanical failures are prone to occur, the effect is not obvious, and there are hidden dangers of explosion protection

[0005] Therefore, there are the following problems in the online detection of crude oil water content: (1) How to effectively detect and judge that the probe has been covered with oil or wax; currently, it can only be manually analyzed and judged by other parameters such as pressure, and the instrument or other equipment is disassembled for verification ;(2) How to prevent the probe from being covered with oil and wax, and prolong the cycle of oil and wax deposition; currently, the heating is generally done from the outside of the pipe, with high power and low heat conduction efficiency, and the outside of the pipe will be very hot, while the inside of the pipe will be hot. The temperature does not change too much; (3) How to effectively remove the oil and wax deposits on the probe without relying on mechanical erasure; at present, only regular hot washing is available, which is inefficient and expensive, and takes a month or more It can only be hot washed once, and the oily wax may only be full in a few hours or a few days

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