Tag Archives: напряженно-деформированное состояние
Currently, there are a huge number of packers type of tool for conducting geological and technical measures in open hole. But despite the great diversity of types of packers, all united by the presence of common deficiencies, namely:
– not reliable sealing packer;
– the destruction of the sealing element in rubber re-planting packer in the wellbore;
– inadvertent operation of the packer during tripping operations (SPO)
– the probability of sticking packer in the wellbore.
The above disadvantages packers may cause complications in the wells that increases the downtime or loss of the well and consequently leads to high cost oil and gas companies.
To address the identified shortcomings in the packer, packer radically new design for the open hole was developed. Special attention was given to the design of sliding bearings to prevent leaking of the sealing rubber member due to occurrence of the pressure difference, and provide further breakdown reliable packer. Increasing the number of cycles stall rubber sealing element is achieved by adding a rubber composition belting cord, leading to increasing its stiffness, with slightly decreased rubber elasticity. Specially designed landing node allowed to exclude spontaneous land packer during tripping, thereby eliminating the possibility of complications during tripping. As a result of constructive upgrades for openhole packer column significantly decreased the percentage of no packer leakage, as was improved sealing rubber elements and node responsible for the safety of these elements.
Thus, to the ins developed packer designs include the preservation of the performance of the sealing rubber member by applying belting cord in the rubber and the mechanism of sliding bearings, which allows multiple re-planting packer in open hole. Just packer design allows exclusion of unauthorized operation during tripping. Another advantage of the upgraded design is to improve the packer tightness when working in wells with a large pressure drop.
In article the attention to a problem of slow subcritical development the crack-like defects resulting from influence mechanical (static and cyclic) loadings in the pipeline is paid.
Creation of model of destruction of the main pipeline in the presence in it the crack-like defects, static loadings, corrosion processes, cyclic damages of metal and dynamic effects represents very complex problem. Besides, it is almost impossible to develop the unified model realizing all variety of mechanisms and processes of destruction of metal owing to features of work of metal in the main pipelines.
In this work this problem is solved by definition of the characteristic considering consequences of processes of accumulation of damages and mechanisms of destruction.
The purpose of this work determination of the actual values of such parameter and research of its influence on the intense deformed state. In work the coefficient of linear temperature expansion as it is present at determination of temperature tension was chosen. Its actual values are defined by a dilatometric method. It was offered to solve researches of influence of coefficient of linear temperature expansion on the intense deformed state by means of the program ANSYS complex. The choice of numerical methods of calculation is caused by that it is possible to solve multiple calculations only by means of the COMPUTER, besides the ANSYS program gives out evident dependences of distribution of equivalent tension on length.
On the basis of the obtained data the dependences defining influence of factors at change of properties of material are constructed, on the intense deformed condition of metal.
It is as a result established that the temperature factor has most of all impact on the intense deformed state at change of coefficient of linear temperature expansion.
In order to achieve high technical and economic performance of the kilns is paramount task of optimizing the design of the tubular coil.
Optimization can be carried out by the technical-economic indicators operating kilns in general. In this case, for the optimization criteria can be taken such as: minimum unit costs of materials, subject to the specified performance and reliability indices; providing continuous and stable nominal plant capacity; the maximum yield of the desired products with minimum fuel consumption and energy resources. In this paper, E. Feigin, considered one of the tasks of optimizing the design of the coils, which is to calculate the optimal temperature trajectory along the length of the coil at a given technological parameters of governance.
A large number of accidents at the tube furnace due to the depressurization of the tubular coil and the release of process fluid in the volume of the furnace. In this connection special importance is the optimization of conditions to reduce the probability of failure of the coil.
Another aspect lies in the optimization of the optimal coil design process in order to reduce metal consumption while providing the required strength and rigidity conditions.
The article discusses the most common form in the task of realizing the sequence and content of the various stages of optimization procedures coils using their mathematical counterparts, obtained by computer simulation using ANSYS software system and FlowVision. Determine the direction of the coil and its optimization criteria. We consider algorithms for optimization of the coil according to the velocity of product yield from the oven and provide the desired strength.