Hydraulic double acting pumping unit

Abstract

The invention relates to a hydraulic bidirectional pumping device which comprises a prime motor, a hydraulic oil pump, a hydraulic oil tank, a control valve, a double-action hydraulic cylinder and plunger pumps. The prime motor drives the hydraulic oil pump. The hydraulic bidirectional pumping device utilizes the double-action hydraulic cylinder to drive the plunger pumps on both sides; the cylinder number is increased; stroke times are reduced; the service lives of easily damaged parts are prolonged; the coverage range of flow is effectively enlarged; suction efficiency of fracturing fluid is effectively improved; complexity of the integral structure is reduced; cost of manufacturing, maintenance and the like is reduced; the requirements on a lubricating system are lowered; the double-action hydraulic cylinder reciprocates to do work, so that working efficiency is improved.

Description

Technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a hydraulic bidirectional pumping device applied to field operations of oil and gas wells. Background technique [0002] Fracturing technology is currently one of the important means for the development of oil and gas, especially in China's domestic shale gas development. For low-permeability oil and gas reservoirs, fracturing operations are generally required to achieve stable and increased oil and gas production. As the main operating unit of fracturing construction, the principle of fracturing pump is to use hydraulic action to inject fracturing fluid into oil and gas wells and form a high pressure, which makes the oil and gas reservoirs form larger cracks. The main function of fracturing is to increase the seepage capacity of oil and gas and increase oil and gas production. [0003] At present, the conventional fracturing pump is installed on the fracturing truck. During the...

AI Technical Summary

Problems solved by technology

The output pressure and flow coverage of this type of fracturing pump is relatively narrow. To achieve different ranges of pressure and displacement requirements, due to the limitation of the number of cylinders, the only way is to replace the hydraulic end valve box that meets different plunger diameters.

Due to the frequent reciprocating movement of the plunger during high-displacement operation of this type of fracturing pump, the fracturing fluid is discharged under high pressure before it is fully sucked in, which affects the working efficiency of the whole pump.

In the power end of this type of fracturing pump, the crankshaft, tie rod, connecting rod, input gear, crosshead and other components are highly integrated, the structure is very complicated, and the manufacturing cost is high, the manufacturing cycle is long, and it is not easy to disassemble and maintain after operation.

Crankshafts, connecting rods, crossheads, and input gears rotate at high speeds and are subject to large loads, so the requirements for the lubrication system are very high. Therefore, it is necessary to arrange a reasonable lubrication system in a small space, which increases the difficulty of design. Cost and Manufacturing Precision

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