Abstract:

From practical constructed of deviated wells in the fields of Cuu Long basin, when working in build and drop sections of the well, the tools and equipments, especially threaded connectors will be affected by fatigue stress. Therefore, the chance of malfunction and destruction is very high. The abrasion level of drilling string and connectors will increase in the well section which is sharply bent. When performing the drilling process in the build and drop sections of the wells, drilling problems cause by sticking bottom hole assembly and equipments are highly occur. On the other hand, while tripping casing or measuring tools in bending section of the well, the chance that equipments can not reach the desired depth is very high. Through this paper, the authors present the method of approaching and specific calculating to test the tripping ability of drill string or casing string though the well sections with high change in inclination on the perspective of mechanical and material strength.