CN201193186Y - A frequency conversion device for an electric workover rig - Google Patents

Abstract

The utility model relates to a frequency conversion device for electric workover rigs used for downhole operations in oil and water wells in oil fields. There is a frequency conversion control cabinet and an auxiliary electrical control cabinet on the side, a gearbox and an angle transmission box are installed between the frequency conversion motor and the winch, and a resistance cabinet is installed on the rear side of the winch. connected to the braking resistor in the cabinet. The utility model is novel in structure and reasonable in design. It applies the frequency conversion technology to the electric workover rig to control the speed and direction of the motor, prolongs the service life of the brake belt of the drawworks, reduces the cost of workover operations and the noise and pollution indicators, and improves the well workover. The operation safety is suitable for popularization and application.

Description

A frequency conversion device for an electric workover rig

Technical field:

The utility model relates to an auxiliary device for downhole operation machinery of oil and water wells in oil fields.

Background technique:

With the extension of oil field development and production time of oil and water wells, the workload of downhole operations is increasing. At present, most of the workover rigs used for downhole operations on site use automobile chassis diesel engines as the power source. In recent years, some oil fields have adopted electric motors or motor-diesel engine dual-power workover rigs. Although the electric motor workover rig or the electric motor diesel engine dual power workover rig has certain advantages over the diesel engine workover rig, since the oil pipes are lowered by free fall during the operation of the workover rig, the brake belt of the drawworks is severely worn. The short service life makes the workover operation cost higher, and the noise and well site pollution are relatively large, and the safety is poor.

Utility model content:

The purpose of the utility model is to provide a frequency conversion device for an electric workover rig that can effectively control the lifting and lowering of the tubing of the workover machine, reduce the wear of the brake belt and improve the working performance during the downhole operation of the oil and water well.

The utility model is achieved in this way. This kind of device is applied to the electric workover rig commonly used in the field. The frequency conversion motor, gearbox and related frequency conversion equipment are installed on the original car body, and the power output from the oilfield power grid is used to drive the frequency conversion motor, which is transmitted to the original vehicle transmission device through the reduction box. The input end drives the well workover and downhole operations. In the process of downhole operation, the frequency of the input AC is controlled by the frequency converter, thereby controlling the speed and steering of the motor. At the same time, the motor and reverse drag are used to realize the lifting and controlled descent of the oil pipe, so as to reduce the wear of the brake belt of the winch and prolong its life. service life, reduce the cost of workover operations, reduce noise pollution, and improve safety.

The frequency conversion device of this motor workover rig is composed of a frequency conversion motor, a winch resistance cabinet, an angle transmission box, a gearbox auxiliary electrical control cabinet, and a frequency conversion control cabinet. There is a frequency conversion control cabinet and an auxiliary electrical control cabinet next to the frequency converter. A gearbox and an angle transmission box are arranged between the winches, and a resistance cabinet is arranged at the back of the winch, and the frequency converter in the frequency conversion control cabinet is respectively connected with the frequency conversion motor and the braking resistor in the resistance cabinet through wires.

The transmission route of the workover rig using the frequency conversion device is: frequency conversion motor --- gearbox --- drawworks --- wire rope --- traveling car hook --- tubing, and its working process is as follows: Hoisting conditions: The 380V power AC power is supplied to the frequency converter after being protected by a circuit breaker and a fuse. The driver selects the appropriate lifting gear according to the load, and controls the output frequency of the frequency converter through the gear handle to adjust the speed of the frequency conversion motor and then adjust the lifting gear. Speed up; in the controlled sliding condition, the oil pipe drives the motor to rotate, and the motor is in the state of generating electricity. This part of the energy is transmitted to the frequency converter, and the frequency converter uses the braking resistor connected to it to consume this part of the energy, so that the oil pipe is controlled to slide down.

The new structure is novel and the design is reasonable. Using it to apply frequency conversion technology to the electric workover rig to control the speed and direction of the motor can prolong the service life of the brake belt of the drawworks, reduce the cost of workover operations, noise and pollution indicators, and improve workover The operation safety is suitable for popularization and application.

Description of drawings:

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Figure 2 is a diagram of the electrical working principle of the device.

Detailed ways:

As shown in the figure, the utility model is composed of a frequency conversion motor 1, a winch 2, a resistance cabinet 3, an angle transmission box 4, a gearbox 5, an auxiliary electrical control cabinet 6, and a frequency conversion control cabinet 7. The assembly relationship is as follows: the frequency conversion motor 1 There is a frequency conversion control cabinet 7 and an auxiliary electrical control cabinet 6 on the side, a gearbox 5 and an angle transmission box 4 are provided between the frequency conversion motor 1 and the winch 2, a resistance cabinet 3 is provided on the rear side of the winch 2, and the frequency conversion in the frequency conversion control cabinet 7 The device is connected to the variable frequency motor 1 and the braking resistor in the resistor cabinet 3 respectively through wires.

Claims (1)

1. electric workover rig converter plant, by variable-frequency motor (1), winch (2), resistor box (3), right angle gear box (4), change speed gear box (5), auxiliary electrical control housing (6), variable frequency control cabinet (7) is formed, it is characterized in that: variable-frequency motor (1) side is provided with variable frequency control cabinet (7) and auxiliary electrical control housing (6), be provided with change speed gear box (5) and right angle gear box (4) between variable-frequency motor (1) and the winch (2), winch (2) rear side is provided with resistor box (3), and the frequency converter in the variable frequency control cabinet (7) is connected with the interior braking resistor of variable-frequency motor (1) and resistor box (3) respectively by lead.

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