High pressure manifold is also called high pressure fluid control parts. High pressure manifold is widely used in petrochemical and natural gas pipelines. Due to the high impact pressure and alternating load, the thickness wear is large. With the increase of service life, fatigue fracture occurs in high pressure manifold. In petrochemical production, pipelines and manifolds are responsible for conveying various materials. Once an accident occurs, it will endanger the normal production of the device, and even cause fire, poisoning, explosion and other malignant accidents. Therefore, the research on damage prediction and service life evaluation of high-pressure manifold is of great concern in the engineering field. This paper will make a more in-depth study, starting from the strength analysis, on this basis, the high-pressure manifold fracture analysis, fatigue fracture life analysis and crack propagation life analysis, at the same time, the principle and results of this paper can also be extended to the oil field and petrochemical industry and other industries, such as tubing, casing, drill pipe, drill stem and other materials and parts damage prediction analysis.
The working pressure of high-pressure manifold of liquid nitrogen pump truck, fracturing truck, sand filling truck and acid fracturing truck currently used by downhole fracturing company of domestic petroleum exploration bureau is more than 40MPa, and the design pressure is 100MPa. According to the code for construction and acceptance of industrial pipeline engineering (gbj235-82), the industrial pipeline is divided into four grades according to the design pressure from low to high. When the pressure in the pipe is more than 10MPa, it is recognized High pressure manifold is the fourth stage. Due to the long service life of high-pressure manifold in downhole fracturing company, and it is often under the action of alternating load, the thickness of the pipeline is worn greatly, and fatigue fracture cracks are easy to appear at the stress concentration. In order to ensure the safe production and provide scientific basis for the correct use of high-pressure manifold, the research results of high-pressure manifold are applied in this paper, and satisfactory results are achieved.
The emergence of finite element method is a great breakthrough in the field of numerical analysis. The basic idea of the finite element method is to discretize the continuous solution domain into a group of finite elements which are connected with each other in a certain way. Since the elements can be combined according to different connection modes, and the element itself can have different shapes, the solution domain with complex geometry can be modeled. Another important feature of the finite element method as a numerical analysis method is to use the approximate function assumed in each element to represent the unknown field function in the whole solution domain. The approximate functions in the element are usually expressed by the values of unknown field functions or their derivatives at each node of the element and their interpolation functions.
In this way, in the finite element analysis of a problem, the values of the unknown field function or its derivatives at each node of the element become new unknowns, thus making a continuous infinite degree of freedom problem into a discrete finite degree of freedom problem. Once these unknowns are solved, the approximate value of each element's internal field function can be calculated by interpolating the vertical number, so as to obtain the approximate solution in the whole solution domain. Obviously, with the increase of the number of elements, that is, the reduction of the element size, or the increase of the element degree of freedom and the improvement of the accuracy of the interpolation function, the approximation degree of the solution will continue to improve. If the element is convergent, the approximate solution will converge to the exact solution.
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