Fracturing truck and drive conveying system thereof

Abstract

The invention discloses a fracturing truck and a drive conveying system thereof. The drive conveying system of the fracturing truck comprises one or more engines, a plurality of oil pumps, a control valve set, a first conveying mechanism and a second conveying mechanism. The first conveying mechanism and the second conveying mechanism respectively comprise an oil cylinder and a pressure cylinder. A plug body is arranged at the extending end of a piston rod of each oil cylinder, and each plug body is movably arranged in the corresponding pressure cylinder. When the number of the engine is one, the engine is used for driving multiple oil pumps, and when the number of the engines is multiple, each engine is used for driving at least one oil pump. The control valve set is used for controlling the oil inlet and oil returning state of the oil cylinder in the first conveying mechanism and the oil cylinder in the second conveying mechanism. According to the fracturing trunk and the drive conveying system thereof, the output pressure and flow coverage range can be effectively increased, the model selection difficulty and the cost of related parts can be effectively lowered, meanwhile, the safety redundancy rate of the drive conveying system of the fracturing truck can be effectively improved, and the service life of a conveying mechanism can be prolonged.

Description

technical field [0001] The invention relates to the technical field of fracturing vehicles, in particular to a fracturing vehicle and its transmission system. Background technique [0002] Fracturing operation is one of the important means to transform oil and gas reservoirs. For low permeability oil and gas wells, it is generally necessary to rely on fracturing operations to achieve the purpose of stabilizing and increasing production. The fracturing vehicle is the main equipment for fracturing construction. Its function is to inject high-pressure and large-volume fracturing fluid into the formation, press the formation apart, and squeeze support materials (such as fracturing sand) into the cracks to strengthen the formation. Permeability, increase oil and gas mobility, enhance oil and gas recovery. [0003] At present, common fracturing vehicles adopt the transmission scheme of "diesel engine-torque converter-transmission shaft-fracturing pump". , to drive the fracturing...

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Problems solved by technology

[0004] In addition, in the above-mentioned transmission scheme, the fracturing pump used as the delivery mechanism generally adopts a crankshaft-type plunger pump. This kind of fracturing pump has a high stroke rate, and the plunger moves frequently, so it needs to be replaced frequently, which affects the construction and has high cost. The coverage of the output pressure and flow of the fracturing pump is relatively narrow. In order to improve the coverage, it is necessary to replace the hydraulic end with a different cylinder diameter.

[0005] In addition, in the above-mentioned transmission scheme, due to the need to select a diesel engine that meets the maximum power, when the power exceeds a certain level (such as 1500KW), the required cost will rise rapidly, and the selection of the model is difficult, which also leads to the selection of supporting torque converter and other components. Narrow model range and high price; Another factor that causes the difficulty in selecting the above-mentioned transmission scheme and high cost is that in the world, the technical maturity and industrial chain perfection of the components and components related to fracturing operations in various countries vary greatly , the diesel engine, hydraulic torque converter or transmission shaft constituting the above transmission scheme need to be purchased from certain countries or regions, which will result in high cost of fracturing trucks using this transmission scheme, and is subject to the cycle and source of imported parts. limit

[0006] In addition, the safety redundancy (reliability) of the above-mentioned transmission scheme is low. Once any one of the diesel engine, hydraulic torque converter and transmission shaft fails, the fracturing operation will be stopped. Since the fracturing operation site is generally located in a remote In addition, these parts are expensive and difficult to prepare in one go. Even in countries with relatively mature fracturing technology, it will take a long time to resume fracturing operations

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