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Constant displacement pump/motor tandem type energy-saving workover rig

A workover rig, tandem technology, applied in drilling equipment, drilling equipment and methods, earthwork drilling and production, etc., can solve problems such as energy waste, achieve the effect of improving energy recovery rate, improving power utilization rate, and low cost

Inactive Publication Date: 2014-07-09
YANTAI UNIV
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  • Claims
  • Application Information

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 quantitative pump / motor series energy-saving Workover rig

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  • Constant displacement pump/motor tandem type energy-saving workover rig

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings. Referring to the accompanying drawings, the quantitative pump / motor series energy-saving workover rig includes a small power machine 1, a large power machine 2, a gearbox 8, a drum 19, a traveling block hook 16, a drum brake 20, a derrick 22 and couplings connecting various parts It also includes a small hydraulic pump 3, a large hydraulic pump 4, a first one-way valve 10, a second one-way valve 11, an overflow valve 9, a hydraulic accumulator, and the first two-position three-way reversing valve 14 , the second two-position three-way reversing valve 15, small quantitative hydraulic pump / motor 5, large quantitative hydraulic pump / motor 6, clutch 7. The displacement of the small hydraulic pump 3 is smaller than that of the large hydraulic pump 4 , and the displacement of the small quantitative hydraulic pump / motor 5 is smaller than that of the large quantitative...

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Abstract

A constant displacement pump / motor tandem type energy-saving workover rig is composed of a small power machine, a large power machine, a transmission, a drum, a small hydraulic pump, a large hydraulic pump, a hydraulic accumulator, a small constant displacement pump / motor and a large constant displacement pump / motor. The small constant displacement pump / motor and the large constant displacement pump / motor are coaxially connected to output power. In the period of auxiliary operation of pipe column lifting, the power machines drive the hydraulic pumps to charge oil into the hydraulic accumulator for storing energy; during pipe column lifting, the power machines drive pressure oil in the hydraulic pumps and the hydraulic accumulator to enter the constant displacement pump / motors to lift a pipe column. Therefore, power of the power machines is reduced greatly as compared with that of a conventional workover rig, and is only about one fourth of that of the conventional workover rig. When the pipe column is lowered, the pipe column is lowered into a well under the action of own gravity, meanwhile, the constant displacement pump / motors are driven to charge oil into the hydraulic accumulator, in other words, the gravitational potential energy of the pipe column is converted into pressure energy in the hydraulic accumulator to be stored, and accordingly energy recovery is realized.

Description

technical field [0001] The invention relates to workover equipment in the petroleum and natural gas industry, in particular to a quantitative pump / motor series energy-saving workover machine. 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 power ...

Claims

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Application Information

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IPC IPC(8): E21B19/00E21B7/00
Inventor 张路军
Owner YANTAI UNIV
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