CAJ | 학술논문

钻杆是石油天然气勘探开发过程中的重要结构件，其服役环境恶劣，易发生失效。基于弹塑性力学中的形变理论建立了纯扭矩作用下钻杆抗扭强度计算的力学模型，根据该模型可以计算钻杆在弹塑性阶段的扭矩。同时，用G105实物钻杆分别进行了轴向载荷下的抗拉测试和纯扭矩下的抗扭测试，抗拉实验得到了钻杆的屈服强度和抗拉强度及断裂时的轴向载荷，抗扭实验得到了钻杆的弹性和塑性极限扭矩。抗扭实验结果和模型的计算结果一致。研究结果为钻柱疲劳、断裂失效机理的进一步研究提供了理论依据，为钻柱强度设计提供了新思路。
찬간시석유천연기감탐개발과정중적중요결구건，기복역배경악렬，역발생실효。기우탄소성역학중적형변이론건립료순뉴구작용하찬간항뉴강도계산적역학모형，근거해모형가이계산찬간재탄소성계단적뉴구。동시，용G105실물찬간분별진행료축향재하하적항랍측시화순뉴구하적항뉴측시，항랍실험득도료찬간적굴복강도화항랍강도급단렬시적축향재하，항뉴실험득도료찬간적탄성화소성겁한뉴구。항뉴실험결과화모형적계산결과일치。연구결과위찬주피로、단렬실효궤리적진일보연구제공료이론의거，위찬주강도설계제공료신사로。
Oil drill pipe is one of most important components for oil and natural gas exploration and development, which is liable to failure because of the poor service environment. In order to avoid the drill string failure, it is necessary to study the failure mechanism of drill string. So, based on the deformation theory of plastic mechanics, the mechanical model which can calculate the twisting strength of drill pipe has been established in this paper. According to this model, the torque of drill pipe can also be calculated in the elastic and plas-tic stage. Simultaneous, the full-scale tensile and torsion test of G105 drill pipe were conducted. The yield strength and tensile strength were obtained through the tensile test. The elastic and plastic limit torque were obtained through the torsion test. The results of torsion test are in excellent agreement with the calculation results. The research results can provide powerful new thoughts and some theoreti-cal basis for the strength design and the further development of the study on the failure mechanism of fatigue for drill pipe respectively.