Hydraulic drive fracturing pump

Abstract

The invention discloses a hydraulic drive fracturing pump. The pump is provided with an oil inlet P, an oil return port P, a liquid inlet V and a high pressure oil outlet H. The pump includes a pressure cylinder and a pilot operated directional control valve. The pressure cylinder includes a low pressure cylinder, a low pressure piston, a left high pressure plunger, a right high pressure plunger,a left high pressure cylinder and a right high pressure cylinder; when the low pressure piston moves left to the position where the low pressure piston fully covers a first through runner, the pilot operated directional control valve is triggered to reverse, and the low pressure piston is braked by a closed left piston cavity; when the low pressure piston moves right to the position where the lowpressure piston completely covers a second through runner, the pilot operated directional control valve is triggered to reverse, and the low pressure piston is braked by a closed right piston cavity;the fracturing pump has the advantages of simple structure, no need of electric control, and low noise.

Description

technical field [0001] The invention relates to the technical field of oil and gas fracturing, in particular to a hydraulically driven fracturing pump. Background technique [0002] Fracturing operation is one of the important means to transform oil and gas reservoirs. For low permeability oil and gas wells, fracturing operations are generally required to achieve the purpose of stabilizing and increasing production. The fracturing pump is the main engine of the fracturing vehicle and the most direct execution equipment to realize the purpose of the fracturing process. It is mainly composed of power end assembly and hydraulic end assembly and other components. [0003] In the prior art, the fracturing pump used as the delivery mechanism generally adopts the crankshaft type plunger pump, Figure 4 It is a schematic diagram of the structure of this crankshaft plunger pump, such as Figure 4 As shown, the crankshaft plunger pump 1' includes a crankshaft 11', a plurality of conne...

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Problems solved by technology

[0004] In the above-mentioned crankshaft type plunger pump, the stroke is short (such as the stroke of the five-cylinder plunger pump is about 200mm), the number of reversing times is large, the plunger moves frequently, and the life of the wearing parts is short, for example, the valve seat of the fluid end, The service life of valves and valve rubbers is only tens of hours; in addition, the output pressure and flow coverage of this crankshaft plunger pump is relatively narrow. To improve the coverage, it is necessary to replace the liquid end with a different cylinder diameter; in addition, When the plunger changes direction frequently and quickly, the fracturing fluid will be discharged before it is fully sucked in, resulting in low suction efficiency and low work efficiency; in addition, the fracturing pump is integrated with a crankshaft, power input gear, connecting rod, and hydraulic pump. The box body and seat body at the end have complex structure, high manufacturing cost, and inconvenient disassembly and maintenance; in addition, the power input gear rotates at high speed and heavy load, which has high requirements for lubrication and cooling, and it is necessary to arrange a complex lubrication system and corresponding cooling. system

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