The Design Of Key Components For 3ZB-2000 Fracturing Pump

With the dramatic development of world economy, the fracturing technology emerges at the right moment, considering the increasing demand of energy and production difficulty. For drilling of oil and gas, the fracturing equipment is significant to increase production. The performance of fracturing pump, which is the'heart'of fracturing equipment, has a direct impact on working capability of the whole fracturing equipment. The domestic study on fracturing equipment starts relatively late and mainly concentrates on researching and developing based on introduction and absorption of foreign products. Therefore, the design and research of key components for 3ZB-2000 fracturing pump in this paper have significant meaning to the development of domestic fracturing equipment.The main research content about designing of key components of 3ZB-2000 fracturing pump in this paper is as follow:(1) Based on the design requirements and user need of 3ZB-2000 fracturing pump, the kinetics and structure design of the power end for fracturing pump has been accomplished.(2) The external load and driving of 3ZB105-2000 fracturing pump, which runs smoothly under the working condition of maximum pressure have been analyzed and transformed reasonably. Utilizing the traditional empirical equation and design experience, the design and selection of parameters and structure of 3ZB105-2000 fracturing pump dynamic section critical component-crankshaft connecting rod system, crosshead part and main bearing have been achieved. In addition, the design and selection of parameters and structure of fluid end main components have been finished.(3) Considering the adverse work environment of fracturing pump and cyclical change of complicated load, the dynamic simulation analysis of fracturing pump dynamic section was conducted based on the kinetics analysis software ADAMS. The dynamics resolution problem of crankshaft, which was a multi-support structure, belongs to indeterminate problem, and a virtual variable called dummy element is introduced to solve this over-constrained problem. The force condition of dynamic section parts during the process have been obtained finally, which provides fundamental basis of fatigue life analysis for key parts.(4) As key components of fracturing pump, the crankshaft and connecting rod bear constantly changing load, which leads to elastic and plastic deformation and then crack and fracture. Therefore, the fatigue analysis of crankshaft and connecting rod is an essential issue in design effort for fracturing pump. Fatigue life analysis theory, in this paper, was used to study fatigue life of crankshaft and connecting rod, based on specialty software Fe-safe. In order to obtain the mode of vibration and natural mode, the modal analysis theory was applied to analyze dynamic characteristics of the crankshaft and connecting rod. The strength and rigidity of designed crankshaft and connecting rod have been analyzed to meet design requirements, and the ideas are proposed to optimize weak link and vulnerable elements, which have guiding significance for follow-up optimization design of fracturing pump.