Energy-saving workover rig based on double metering pumps or motors

Abstract

The invention provides an energy-saving workover rig based on double metering pumps or motors. The energy-saving workover rig is composed of a small power machine, a large power machine, a gearbox, a roller, a small hydraulic pump, a large hydraulic pump, a hydraulic accumulator, the small metering hydraulic pump or motor, the large metering pump or motor, a torque coupler and the like. The small metering hydraulic pump or motor and the large metering pump or motor are respectively connected with a chain wheel of the torque coupler through clutches. In the lifting and dropping process of tubular columns, three force gears are configured, the tubular columns are lifted through different force gears according to different weights of the tubular columns needing lifting, and the power utilization rate of the power machines is increased; energy is recovered through different force gears according to different weights of the dropping tubular columns, and the energy recovery rate of gravitational potential energy of the tubular columns is increased; energy generated in the auxiliary operation period when the tubular columns are lifted by the power machines is stored by the hydraulic accumulator and is used in the tubular column lifting process, and the installed power of the power machines is reduced.

Description

technical field [0001] The invention relates to workover equipment in oil and natural gas industries, in particular to an energy-saving workover machine based on double quantitative pumps / motors. Background technique [0002] One of the most common operations of workover rigs is the operation of raising and lowering pipe strings. The operation of the lifting string is an intermittent cycle process. The workover rig spends about 1 / 4 of the entire lifting cycle, while the time for auxiliary operations such as shackles and placing single strings takes up 3 / 4. Motorized hoisting strings require a power engine to work with high power, while auxiliary operations such as shackles and placement of single pipes require a power machine to work with low power. Conventional workover rigs have relatively large installed power in order to meet the needs of rapid lifting of pipe strings. The high-power power machine works under low power most of the time, the economy is poor, and the po...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the energy waste phenomenon of conventional workover rigs in the operation of lifting and lowering pipe strings, and at the same time overcome the above-mentioned shortcomings of existing hydraulic energy storage workover rigs, the present invention provides a dual-quantitative pump / motor based Energy-saving workover rig

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