نوع مقاله : مقاله پژوهشی
نویسندگان
دانشکده مهندسی معدن، دانشکدگان فنی، دانشگاه تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Wellbore instability is a major problem in the petroleum industry and mainly because of mechanical, chemical, and thermal factors which result in substantial yearly expenditures. It is a major cause of wellbore failures and represents a serious challenge in the drilling industry. With the increase of drilling depth, the stability of the wellbore in deep fractured formation has received more and more attention. The purpose of this research is to investigate the effect of each parameter on the stability of oil wells and specify the most important of them and order them by importance in oil well stability. In this study, the effect of seven parameters on well stability was investigated using sensitivity analysis. The maximum total displacement created in the well wall is considered as the stability criterion. Finally, these parameters are sorted from maximum to minimum effective parameters. The sensitivity analysis is performed by numerical modeling. In the relevant model, for a set of important parameters that have been selected, the selected basic values are specified and then by changing the value of each parameter in its range of variation and keeping other parameters constant and analyzing it in Phase2 software the stability of oil well will be examined, or in other words, the sensitivity of that parameter will be examined. Then this process was performed for other parameters and in fact the sensitivity of other parameters was analyzed. Finally, it was found that the studied parameters from high to low sensitivity are: pore pressure, drilling mud pressure, horizontal lateral stress ratio, internal friction angle, cohesion coefficient, young’s modulus and Poisson’s ratio.
کلیدواژهها [English]