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CN-122014594-A - Thermal insulation and temperature reduction protection device and method for submersible electric pump sensor

CN122014594ACN 122014594 ACN122014594 ACN 122014594ACN-122014594-A

Abstract

The invention relates to the technical field of electric submersible pump oil extraction, in particular to a thermal insulation and cooling protection device and method for a submersible electric pump sensor. The technical scheme is that the sensor comprises an oil-submersible motor, a motor conversion connector, a heat-insulating protection connector and a sensor shell, wherein the lower end of the oil-submersible motor is movably connected with the upper end of the motor conversion connector, the lower end of the motor conversion connector is movably connected with the upper end of the heat-insulating protection connector, the lower end of the heat-insulating protection connector is movably connected with the sensor shell, and the heat-insulating protection connector is made of a nonmetal heat-insulating material. The sensor has the beneficial effects that the heat insulation protection joint is arranged between the submersible motor and the sensor shell to prevent heat generated by the operation of the submersible motor from being transferred to the sensor shell, so that the sensor can be ensured to normally work in a well fluid temperature environment with the pumping depth of 70-80 ℃, and the operation life of the sensor can be prolonged.

Inventors

  • HE BAOXIN
  • ZHANG ZHIHAO
  • ZHANG ZHENHE

Assignees

  • 新疆胜利无杆泵采油技术有限公司

Dates

Publication Date
20260512
Application Date
20260310

Claims (8)

  1. 1. The heat-insulating and temperature-reducing protection device for the submersible electric pump sensor is characterized by comprising a submersible motor (1), a motor conversion connector (3), a heat-insulating protection connector (5) and a sensor shell (7), wherein the lower end of the submersible motor (1) is movably connected with the upper end of the motor conversion connector (3), the lower end of the motor conversion connector (3) is movably connected with the upper end of the heat-insulating protection connector (5), the lower end of the heat-insulating protection connector (5) is movably connected with the sensor shell (7), and the heat-insulating protection connector (5) is made of a nonmetal heat-insulating material.
  2. 2. The heat-insulating and temperature-reducing protection device for the electric submersible pump sensor according to claim 1, wherein the heat-insulating and protecting joint (5) comprises a joint main body (5.1), a joint upper flange (5.2) and a joint lower flange (5.3), the joint main body (5.1) is made of nonmetal heat-insulating materials with an I-shaped structure, the joint upper flange (5.2) is arranged at the upper part of the joint main body (5.1), the joint lower flange (5.3) is arranged at the lower end of the joint main body (5.1), and the upper end of the joint main body (5.1) is movably connected with the lower end of the motor conversion joint (3).
  3. 3. The thermal insulation and temperature reduction protection device for the submersible electric pump sensor according to claim 2 is characterized in that the joint upper flange (5.2) is provided with 6-8 screw holes and is connected with the lower end of the motor conversion joint (3) through a middle connecting bolt (4), and the joint lower flange (5.3) is provided with 6-8 screw holes and is connected to the upper end of the sensor shell (7) through a lower connecting bolt (6).
  4. 4. The heat-insulating and temperature-reducing protection device for the submersible electric pump sensor according to claim 1, wherein the upper end of the motor adapter (3) is connected to the lower end of the submersible motor (1) through an upper connecting bolt (2).
  5. 5. The heat-insulating and temperature-reducing protection device for the submersible electric pump sensor according to claim 3 is characterized in that a sealing ring (5.4) is arranged on the outer side of the upper part of the upper flange (5.2) of the connector and is inserted into the lower end of the motor adapter (3).
  6. 6. The thermal insulation and temperature reduction protection device for the submersible electric pump sensor according to claim 1 is characterized in that a pressure sensor, a temperature sensor, a vibration sensor and a leakage current sensor are arranged in the inner cavity of the sensor shell (7).
  7. 7. The heat-insulating and temperature-reducing protection device for the electric submersible pump sensor according to claim 1, wherein the nonmetal heat-insulating material adopted by the heat-insulating protection joint (5) is PEEK material.
  8. 8. A method for using the thermal insulation and temperature reduction protection device of the electric submersible pump sensor according to any one of claims 1 to 7, which is characterized by comprising the following steps: 1. Before construction, a star point lead wire of the submersible motor (1) is pulled out from the lower end of the motor adapter (3), penetrates through the inside of the heat insulation protection connector (5) and the sensor shell (7), and then the heat insulation protection connector (5) is fixedly connected with the lower end of the motor adapter (3) through the middle connecting bolt (4); 2. The star point lead wire of the submersible motor (1) is firmly connected with the corresponding lead wire in the upper end of the sensor shell (7); 3. the sensor shell (7) is connected and fixed with the heat insulation protection joint (5) by using a lower connecting bolt (6) to be connected to the upper end of the sensor shell (7); 4. Before entering the well, checking whether a pressure sensor, a temperature sensor, a vibration sensor and a leakage current sensor in a sensor shell (7) are normal or not, simultaneously confirming whether a heat insulation protection joint (5) is good or not, then entering the well, blocking heat generated by the operation of a submersible motor (1) through the heat insulation protection joint (5), transferring the heat to the sensor shell (7), ensuring that the pressure sensor, the temperature sensor, the vibration sensor and the leakage current sensor in the sensor shell (7) work normally in a well liquid temperature environment with the pumping depth of 70-80 ℃, and prolonging the service life of the sensor.

Description

Thermal insulation and temperature reduction protection device and method for submersible electric pump sensor Technical Field The invention relates to the technical field of electric submersible pump oil extraction, in particular to a thermal insulation and cooling protection device and method for a submersible electric pump sensor. Background At present, in the production operation and management of thick oil mixing dilution or water injection electric submersible pump lifting process, the submersible electric pump underground sensor is very important for detection of electric pump operation parameters, underground pressure temperature and the like, and is an important data support for oil extraction engineers for judging the electric pump operation conditions, converting liquid level and other parameters, and especially can realize closed-loop control by matching with a ground variable frequency control system so as to amplify production pressure difference and pursue optimal yield. And the running conditions with diseases such as abnormal temperature rise and vibration can be found in time, signals are sent to the variable frequency control cabinet, the running with diseases is avoided by adopting modes such as frequency reduction, and the service life of the electric pump is prolonged. The chip is influenced by the temperature of the chip, components and the like, particularly the highest grade of the chip is 125 ℃ at present, and the domestic chip is not particularly stable, because the domestic chip is in a downhole high-temperature high-pressure state, once the chip breaks down, the pump cannot be replaced without lifting, the pump lifting needs higher well repairing cost, the yield is influenced, the loss is caused, and the cost of inspecting and maintaining the electric pump is increased. The current widely adopted are imported American chips, american 125 ℃ chips and high Wen Yuan resistant devices, which can be imported into China through third country, 150 ℃ chips and 175 ℃ chips are strictly controlled in the United states, little channel is left in China, and the price is 2-4 times of 125 ℃. The temperature of the oil well in the Tahe oil field is about 126 ℃, the 5500 m in the middle of the oil layer is about 3000 m, the operating environment temperature of the electric pump is about 70-80 ℃, and in the actual running state, the temperature of the sensor actually reaches 120-180 ℃ due to the heating of the submersible motor of the electric pump, so that the down-hole sensor is frequently failed, data cannot be transmitted to the ground, down-hole parameters cannot be always on line, and the correct judgment, analysis and corresponding measures of the production parameters of the oil well are affected. According to the working state of the sensor, the temperature of the electric pump sensor is raised from 70-80 ℃ to 120-180 ℃ to be approximately 50-100 ℃, the heat is mainly from the temperature rise of the operation of the submersible motor (one temperature sensor in the inner cavity of the motor is used for detecting the operation temperature of the motor, the sensor is externally connected with the oil well ring sleeve to detect the environment temperature of the oil well), and the heat conduction mode, conduction, convection and radiation are three modes, namely, the well liquid is discharged from bottom to top, the ring sleeve is filled with liquid and always flows upwards rapidly, and the radiation mode is basically discharged, and referring to FIG. 1, more, the conduction mode that the metal shell of the electric pump submersible motor is connected with the metal shell of the sensor determines the main temperature rise source of the sensor, and the mode of cutting off the heat of the metal shell of the motor to the sensor on the premise that the inlet of the current high temperature resistant chip is limited is a mode which is relatively economical and convenient to realize at present. Disclosure of Invention The invention aims at overcoming the defects existing in the prior art and providing a heat insulation and temperature reduction protection device and a method for a submersible electric pump sensor, and the heat insulation protection joint is arranged to block heat generated by the operation of the submersible motor and transmit the heat to the sensor shell, so that the sensor can work normally under the well liquid temperature environment with the pumping depth of 70-80 ℃ and the operation life of the sensor can be prolonged. The invention relates to a heat-insulating and temperature-reducing protection device for an electric submersible pump sensor, which comprises a submersible motor (1), a motor adapter (3), a heat-insulating protection connector (5) and a sensor shell (7), wherein the lower end of the submersible motor (1) is movably connected with the upper end of the motor adapter (3), the lower end of the motor adapter (3) is movably connected with the upper end of the hea