2800 Type Fracturing Pump Power End Structure Optimization Design

Fracturing pump is an important oil field drilling fracturing equipment, the fracturing technology widely was used in oil and gas fields, not only can increase the oil and gas well production, greatly accelerate the pace of oil and gas field development, but also can greatly improve oil production.As the shallow Wells oilfield successively after completion, the subsequent oilfield drilling pressure is more and more big, more and more high to the requirement of fracturing equipment, fracturing pump technology structure is more and more strict, at the same time, fracturing pump is also more and more heavy. Each big oilfield wants to get high pressure, large displacement and high power, more excellent performance, weight is lighter, can work under the condition of the fracturing pump. At present, the 2800 tvne fracturine pump hecause nf its hich nressure characteristics has graduallv into the major oil fields in the market.Although our country has already have the ability to develop fracturing units, products have been sold to foreign countries, but due to the fracturing technology in China started late, the core components rely on the import, the basic parts is fake, either to production on the basis of experience. The determination of the size is not very accurate, the structure is lack of innovation, waste materials, not only increase the cost, and fracturing pump large and bulky, will increase a large burden on weight, and the oil Wells in the mountains, the forest need to be small, lightweight high power fracturing pump.So,analysis the fracturing pump structure, understand the principlie, and on this basis,need optimization to the existing structure and sixe of the fracturing pump, in the case of does not affect the use, to meet the purpose of save material, reduce the cost,and light, so as to adapt to the environment in the work environment that is bad to transportation.First of all,need to understand the structure of the fracturing pump and its working principle, and then understand the power end nature of fracturing pump is a slider-crank mechanism, through the fracturing pump power end work and force formula.combined the 2800 type fracturing pump related parameters with the formula derived calculate the crankshaft, connecting rod, piston in the output pressure of the biggest (140 mpa) force, also consider the crankshaft torque when under stress conditions of the different parts of the crankshaft, find the parts most pressure.Secondly, for the existing 2800 type fracturing pump power end, investigate and survey to the size of the crankshaft, connecting rod, piston research, draw 2800 type fracturing pump crankshaft, connecting rod, the three-dimensional mod el.Combined with the previous formula derived various parts’s movement in the process, and loading force according to actual condition to the crankshaft, connec ting rod, piston, finite element analysis by finite element analysis is very intuitiv e to see the result of the crankshaft, connecting rod, piston stress distribution, fo und that the existing maximum stress of the crankshaft, connecting rod, piston is far less than the strength of the material itself can bear, size is relatively surpl us, material waste greatly, need to be optimized.Finally, according to the finite element analysis of the situation, and combined with the actual situation of the existing of crankshaft, connecting rod, piston rod, and optimize the plunger.1) existing crankshaft main journal and the characteristics of the connecting rod neck directly connected, increase more convex convex set and convex set, shaft neck under the stress of the condition of the same force.Under different diameter of the crankshaft axis neck, loaded by axial synthesis and axial force of cosine function, find out the relationship between stress and the diameter, and draw out the optimized mechanical model for finite element analysis to verify the optimized crankshaft can work safety.2) although the existing connecting rod structure size optimization of space, but considering the actual use and assembly disassembly problem of connecting rod small end connection way to change, and the reference design manual on the diesel engine connecting rod design of section size, redesigned the connecting rod and the connecting rod shaft floor grooves and the connection with small head ends rounded part of the finite element analysis, find out the groove depth and stress, and the relationship between the shaft rib plate and the stress drawing optimized mechanics model of connecting rod, and verified by finite element analysis can work safety.3) because of the connecting rod structure changes, the plunger rod also has carried on the corresponding structure design and finite element analysis of the rounded corners and stress of the shaft diameter, draw the optimized mechanics model of piston connecting rod, and verified by finite element analysis piston connecting rod can work safety.4) plunger near by finite element analysis and the relationship between stress and the diameter of the hollow part of the power end, depth and the relationship between stress and connected to the piston connecting rod groove fillet and stress of the relationship, to map the optimization of the connecting rod mechanical model, and verified by finite element analysis plunger can work safety.Based on the principle and movement of 2800 type fracturing pump power end, the stress distribution was analyzed, and summarizes the related movement equation.And with the help of finite element software, analyzed the structure of existing fracturing pump power end is optimized and combined with actual situation, some of the crankshaft, connecting rod, piston rod, and some dimensions of plunger and the relationship between the stress, make people for fracturing pump power end structure had certain understanding, and for the related structure has some knowledge, the relationship between size and stress.For product development and design personnel to the fracturing pump power structure and size optimization direction to provide a reference.For fracturing pump power end structure compact, lightweight played an important role.