Designing a Mobile High-Pressure Well Service Pump Unit on a Vehicle Chassis

In the oil and gas industry of a number of countries, long-life fields contain a significant amount of hard-to-recover hydrocarbon reserves, the production of which has been hampered by a lack of technology. Reactivation of old wells and stimulation of new wells is a topical issue today. The most effective technology is hydraulic fracturing. For fracturing operations, it is necessary to use modern and reliable equipment, an important part of which is a mobile high-pressure pumping unit. The purpose of this study is to improve the technical and economic parameters of the mobile pumping unit design under different types of external loads. The tasks of the research are selection of the drive part of the high-pressure plunger pump NP 720 with the weighting of the units on the chassis KamAZ 63501 and design of the superframe structure with the use of strength analysis methods in CAE-system. The method of automatic selection of the operating mode of the drive part of the plunger pump is developed, by means of which it is possible to calculate on what gear and at how many engine revolutions the necessary operating conditions for each pump mode will be fulfilled on the base of the given values of torque, speed of rotation of the pump input shaft, as well as gear ratios of the built-in gearbox and automatic gearbox. The method of calculation of the number of places of superstructure fastenings on the chassis is proposed, which is based on the strength calculation of bolt connection on shear. Using the overload experienced by the superstructure and its total weight, changing the diameter of bolts from standard values, the minimum number of fasteners was calculated. Using the finite element method in the MathCad system of mathematical calculations, a statically indeterminate beam was calculated using the finite element method, which was used to determine the optimal location of the fastening nodes of the subframe of the mobile pumping unit.