Well control protection device and method for electric submersible pump

Abstract

The invention discloses a well control protection device and method for an electric submersible pump. The electric submersible pump is arranged in an oil well. The well control protection device comprises a working fluid level monitoring device, an underground temperature monitoring device and an automatic watering device, wherein the working fluid level monitoring device is arranged at the wellhead of the oil well, and is used for monitoring and acquiring the working fluid level data of the oil well and transmitting to the automatic watering device; the underground temperature monitoring device is arranged on a pump head of the electric submersible pump, is used for monitoring and acquiring the temperature value of an electric submersible pump motor and transmitting to the automatic watering device; the automatic watering device is connected with the working fluid level monitoring device and the underground temperature monitoring device, and is used for generating a warning signal according to the working fluid level data or the temperature value of the motor and watering the loop space of the oil well according to the warning signal.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, and particularly designs a well killing protection device and method for an electric submersible pump. Background technique [0002] As the cost of crude oil extraction is getting higher and higher, the proportion of heavy oil in the world and China's crude oil production is increasing. Steam-assisted gravity drainage (SAGD) technology has entered large-scale application at home and abroad, and has achieved large-scale success in major heavy oil blocks in the world. At present, the SAGD lifting technology is dominated by rod pumps. The reliability of rod pumps is low, the surface technology is complex, and the workload of maintenance and repair is large. Due to the limitations of downhole casing and processing technology, the current maximum pump diameter is Φ140mm, and the maximum pump diameter is Φ140mm. -1 case, only 531m 3 / d theoretical displacement, for SAGD oil wells, the displaceme...

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Problems solved by technology

The general setting value is 75% to 80% of the rated working current. This method has certain limitations. The actual working current of the electric pump well in the production state is affected by various factors, so it should not be used as the underload setting value. In addition, the setting of the underload protection value is immediacy. With the change of the oil well output, if the setting value is not adjusted in time or is inaccurate, the electric pump will stop frequently due to the underload setting, which is bound to be greatly reduced. Electric pump service life, causing unnecessary losses

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