Automatic starting and stopping device of pumping well

Abstract

The utility model provides an automatic start-stop device of a pumping well, which relates to the technical field of oil and gas exploitation equipment and comprises an electric cabinet, a temperature monitoring device and a control unit, the temperature monitoring device is preferably an infrared temperature tester, is installed close to the polish rod in a non-contact mode and can monitor the temperature of the polish rod of the pumping well in real time. The control unit comprises a signal processing unit, a logic controller and a relay. And a buffer device is arranged between the temperature monitoring device and the pumping well polish rod packing, so that the monitoring stability and accuracy are improved. When the temperature exceeds a preset threshold value, the control unit automatically controls the pumping unit to stop; and when the temperature is reduced to a safe temperature, the control unit automatically starts the oil pumping unit after time delay of the time relay. The pumping unit is automatically controlled to be started and stopped, packing sealing failure and oil and gas leakage caused by high temperature are effectively avoided, yield loss is reduced, and the working intensity of workers and the labor cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas exploitation equipment technical field, concretely relates to an automatic start and stop device of pumping well. BACKGROUND

[0002] Pumping well is an important part of oil exploitation, and its operation status directly affects oil production and safety production. At present, the start and stop of pumping well usually adopt local manual closing or remote manual issuing control instruction mode. This mode is not intelligent enough for the control of electric elements in the electric control box of pumping well, especially for the monitoring and reaction of pumping well polished rod temperature change.

[0003] Specifically, the current control scheme does not realize the function of real-time monitoring of pumping well polished rod temperature, and cannot ensure timely shutdown when the temperature abnormally rises, which may lead to packing seal failure and cause oil and gas leakage and pollution to the environment; in addition, when the pumping well polished rod temperature returns to normal, there is no automatic control mechanism, and the pumping unit may be in a shutdown state for a long time, resulting in yield loss; finally, the existing start and stop control needs manual intervention, which increases the work burden of operators and the response is not timely. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an automatic start and stop device of pumping well, which monitors the temperature of pumping well polished rod in real time and automatically controls the start and stop of pumping unit, improves the safety and reliability of pumping well operation, and reduces labor cost.

[0005] To achieve the above purpose, the utility model realizes the following technical scheme:

[0006] An automatic start and stop device of pumping well comprises an electric control box, characterized in that it further comprises a temperature monitoring device installed on the pumping well polished rod packing and a control unit electrically connected with the temperature monitoring device.

[0007] The temperature monitoring device is installed non-contact near the polished rod.

[0008] The control unit comprises a signal processing unit, a logic controller and a relay electrically connected in sequence, the signal processing unit is electrically connected with the temperature monitoring device, the relay is connected with a contactor in the electric control box, and the contactor is electrically connected with the motor of pumping well.

[0009] Further, the temperature monitoring device is an infrared temperature tester.

[0010] Further, a buffer device is arranged between the temperature monitoring device and the pumping well polished rod packing.

[0011] Further, the logic controller is a PLC programmable logic controller.

[0012] Further, the relay includes an intermediate relay and a time relay, which are connected in parallel between the logic controller and the contactor.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] I. By installing the utility model, the temperature monitoring device can be used to monitor the temperature of the sucker rod in real time, and when the temperature abnormally rises, the control unit can be used to control the automatic shutdown of the motor of the sucker rod, which effectively avoids the seal failure of the packing and the leakage of oil and gas caused by high temperature, reduces the potential pollution risk to the environment, and improves the safety of the operation of the sucker rod.

[0015] II. When the temperature monitoring device monitors the temperature of the sucker rod to drop to the set safety temperature, the control unit controls the automatic start of the motor of the sucker rod, which avoids the loss of production caused by long-term shutdown.

[0016] III. By automatically controlling the start and stop of the pumping unit, the need for manual inspection and manual operation is reduced, and the working intensity and labor cost of employees are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the utility model;

[0018] In the drawings:

[0019] 1, infrared temperature tester; 2, signal processing unit; 3, PLC programmable logic controller; 4, intermediate relay; 5, time relay; 6, contactor. DETAILED DESCRIPTION

[0020] The technical solutions of the utility model will be described below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] In the description of the utility model, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] As Figure 1 shown: an automatic start-stop device of an oil pumping well, comprising an electric control box, characterized in that: further comprising a temperature monitoring device installed on the polished rod packing of the oil pumping well, and a control unit electrically connected with the temperature monitoring device;

[0023] In this embodiment, the temperature monitoring device is preferably an infrared temperature tester 1, which is installed non-contact near the polished rod. A buffer device is arranged between the infrared temperature tester 1 and the polished rod packing of the oil pumping well.

[0024] The control unit comprises a signal processing unit 2, a logic controller and a relay which are electrically connected in sequence. The signal processing unit 2 is electrically connected with the temperature monitoring device. The relay is connected with a contactor 6 in the electric control box. The contactor 6 is electrically connected with the motor of the oil pumping well. The logic controller is a PLC programmable logic controller 3. The relay comprises an intermediate relay 4 and a time relay 5, which are connected in parallel between the PLC programmable logic controller 3 and the contactor 6.

[0025] The working principle of the utility model is as follows:

[0026] The infrared temperature tester 1 is installed above the polished rod packing of the oil pumping well and is installed non-contact near the polished rod, which can monitor the temperature of the polished rod of the oil pumping well in real time. A buffer device is arranged between the infrared temperature tester 1 and the polished rod packing of the oil pumping well to ensure the accuracy and stability of the monitoring.

[0027] The infrared temperature tester 1 converts the temperature signal into an electrical signal through the signal processing unit 2 and transmits it to the PLC programmable logic controller 3 for processing.

[0028] After receiving the signal transmitted by the signal processing unit 2, the PLC programmable logic controller 3 judges according to the preset temperature threshold. In this embodiment, the upper temperature threshold and the lower temperature threshold are selected as 60 DEG C and 20 DEG C respectively. When the temperature exceeds 60 DEG C, the PLC programmable logic controller 3 controls the intermediate relay 4 to act, so that the AC contactor 6 in the electric control box is disconnected, and the oil pumping unit stops working, avoiding the sealing failure of the packing and the oil and gas leakage caused by high temperature. When the temperature drops to 20 DEG C, the PLC programmable logic controller 3 activates the time relay 5, and after a delay of 120 minutes, the AC contactor 6 is attracted, and the oil pumping unit is automatically started, avoiding the yield loss caused by long-term shutdown.

[0029] The above embodiment is only for illustrating the technical concept and characteristics of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it, and it cannot limit the protection scope of the utility model. Any equivalent transformation or modification according to the spirit and essence of the utility model should be covered within the protection scope of the utility model.

Claims

1. An automatic start-stop device for pumping wells, comprising an electric control box, characterized in that: The temperature monitoring device is installed on the polished rod packing of the pumping well, and a control unit is electrically connected with the temperature monitoring device; The temperature monitoring device is non-contact and adjacent to the polished rod; The control unit comprises a signal processing unit, a logic controller and a relay which are electrically connected in sequence, the signal processing unit is electrically connected with the temperature monitoring device, the relay is connected with a contactor in an electric control box, and the contactor is electrically connected with a motor of the pumping well; The temperature monitoring device is used to monitor the temperature of the polished rod of the pumping well in real time, and the control unit is used to control the motor of the pumping well to automatically stop when the temperature of the polished rod exceeds a preset threshold value; when the temperature monitoring device monitors that the temperature of the polished rod of the pumping well decreases to a set safety temperature, the control unit controls the motor of the pumping well to automatically start the pumping unit.

2. An automatic start / stop device for pumping wells according to claim 1, characterized in that: The temperature monitoring device is an infrared temperature tester.

3. An automatic start / stop device for pumping wells according to claim 1, characterized in that: A buffer device is arranged between the temperature monitoring device and the polished rod packing of the pumping well.

4. An automatic start / stop device for pumping wells according to claim 1, characterized in that: The logic controller is a PLC programmable logic controller.

5. An automatic start / stop device for pumping wells according to claim 1, characterized in that: The relay comprises an intermediate relay and a time relay, and the intermediate relay and the time relay are connected in parallel between the logic controller and the contactor.

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