Paraffin removal and viscosity reduction device for oil well

Abstract

The invention provides a paraffin removal and viscosity reduction device for an oil well to provide an underground electric heating device which is good in energy-saving effect, paraffin removal function and viscosity reduction function. The device is characterized in that the device is composed of a transformer, an electric heating body, a sensor, a programmable controller, an optical fiber temperature measuring module, a middle relay, a transformer gear switching contactor, a power adjusting module, a pithead temperature transmitter, an analog quantity I / O expansion module, a control circuit and a power supply circuit, wherein the transformer has multiple voltage output gears, and the control circuit and the power supply circuit are matched with the electric heating body; the pithead temperature transmitter inputs an acquired pithead temperature signal to the programmable controller; the programmable controller controls an output gear of the transformer and the output power of the power adjusting module; work voltage is provided for the electric heating body through the transformer, and the output power of the electric heating body is controlled by the power adjusting module; the sensor is an optical fiber, and the sensor is connected with the optical fiber temperature measuring module through an optical fiber access port to provide underground temperature data for the optical fiber temperature measuring module.

Description

Technical field: [0001] The invention relates to a device used in the process of oil well exploitation to solve the problems of wax removal and viscosity reduction of heavy oil. Background technique: [0002] In the field of oil production, the high-water-cut heavy oil (or wax deposit) well is prone to stuck pumps, which has always restricted the production timeliness of heavy oil (or wax deposit) wells. In order to solve this problem, someone once used the method of downhole electric heating for this field. Due to the harsh environment of downhole operations, the solution is required to meet the requirements of corrosion resistance, high pressure strength, high temperature resistance and high dielectric strength. Because the existing scheme uses a constant power electric heating structure, and the system control method is too simple, it will cause energy waste: ①The existing method is to set the output power of the heating element to the maximum heat dissipation power of c...

AI Technical Summary

Problems solved by technology

Because the existing scheme uses a constant power electric heating structure, and the system control method is too simple, it will cause energy waste: ①The existing method is to set the output power of the heating element to the maximum heat dissipation power of crude oil to ensure The influence of formation temperature gradient changes on electric heating power requirements is ignored; ②The existing control method is generally to measure the temperature of the wellhead. Although this method is intuitive and simple, there are many problems, such as The temperature is mostly set manually, and the set value cannot be corrected in time according to changes in the production situation. In order to meet the demand, the set value is usually set too high, etc., which will cause a waste of energy.

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