Fracture Analysis Of Oil Tubing

With the strong push forward China's industrialization process, energy demand for oil increasing, there are increasing overseas investment in the oil industry, it also increases the further development of existing domestic oil fields. As the country has experienced many large oil field exploitation for decades, and now has entered the late majority of mining, oil well integrated water content increased, the pipeline is very bad work environment, resulting in frequent accidents of pipeline failure, severely affected the oil production efficiency, safety, economy.Pipeline failure can be divided into three categories:pipeline rupture, leakage and pipeline tubing trip. Tubing and tubing trip in which leakage was mainly due to the precision tubing thread inadequate during installation, seal caused by poor, with the oil production increase on the installation requirements, these two types of failure have become rare. Pipeline rupture is the failure of the mainstream pipeline, and the oil column in the upper part of the higher risk of fracture, when the upper string breaks, the oil column will free fall, not only damaged the pump, but also the lower part of the oil pipeline pier string bending deformation, resulting in a large number of scrap tubing. Thus, the fracture failure of the pipeline to do a detailed analysis, drawn to prevent pipe rupture strength information, on oil production is of great practical significance. Therefore this paper to address the issue of pipeline fracture of the related analysis.Pipeline rupture can be attributed to two problems:One is in the pipeline under cyclic loading fatigue fracture occurred, one due to lack of residual strength of defective pipes under tensile loading occurs in the fracture. Fatigue fracture is due to defects or tubing itself contains a bias stress resulting in cracks in the larger alternating expansion under the action of stress, until fracture. A sense of fatigue fracture is inevitable, but the tubing downhole flow through standardized on the use of measures such as grade tubing, tubing can effectively reduce the fatigue fracture.Residual strength of defective pipeline rupture caused by a lack is due to go down before the estimation of the strength of tubing, which led into the well next to those pipes is not a long time after the occurrence of fracture. Most of these faults can be avoided, through the pipeline with defects finite element analysis to calculate the residual strength of pipelines and the depth of the relationship between the defect and thus the size of the defect exceeds the critical pipeline in a timely manner scrapped to avoid this type of tubing to go down, can effectively reduce the residual strength due to lack of pipeline rupture caused.Chapter 4 in this article use the classical mechanics of materials theory to the analysis carried out the necessary verification, that the analysis of this article Despite the error, but the error is controlled within the allowable range, that can be measured with this article Oil production in the guide. Chapter 5 of this article is the intensity in the pipeline based on the analysis of the effectiveness of pipeline issues, recognizing the failure of tubing in the tubing string in place throughout the distribution range of the distribution was 4. The four interval conditions and the fracture load for different reasons, and can be graded according to the tubing used.Finally, for a full summary and outlook, a brief description of the article can be used in the oil fields of industrial production, and the future of research in that direction.Analytical methods used in this paper and related analysis conclusions of oil production process to prevent the tubing provides a Lilunyiju Fracture, Ye Yan Zheng Zuo for the subsequent tests the theory of a pre-prepared, with some of the Zhi Dao significance in academic research and Gongchengsheji there is a certain reference value.