@Article{cmes.2012.089.143,
AUTHOR = {Deli  Gao, Lianzhong  Sun, Hongshu  Wei, Shunwen  Wang},
TITLE = {On Improving the Accuracy of Prediction of the Down-hole Drag \& Torque in Extended Reach Drilling (ERD)},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {89},
YEAR = {2012},
NUMBER = {2},
PAGES = {143--162},
URL = {http://www.techscience.com/CMES/v89n2/26880},
ISSN = {1526-1506},
ABSTRACT = {Due to the complexity of forces acting on the down-hole tubular strings in extended
reach drilling (ERD), the factors which influence the process should be taken into
account as much as possible, in order to predict the down-hole drag & torque more
accurately. This can help us to identify and prevent the problems related to downhole drag & torque in ERD. The effects of such factors, as the tubular buckling, the
buoyancy, the mechanical resistance and the friction reducer, on down-hole drag &
torque, are taken into account in this paper, in order to improve the accuracy of the
prediction of the drag and the torque In addition, the optimization problem for controlling the down-hole drag & torque is solved in this paper. The optimum placement of the friction reducers is determined, in order to minimize the down-hole
drag & torque, while allowing for a moderate contact between down-hole tubular
and wellbore. The consideration of the mentioned effects, and the control methods
presented, were used for the optimization analysis of down-hole drag & torque and
the drilling operation, in extended-reach drilling. Interpretation of the field data
provides us with an insight into the down-hole drag & torque computations.},
DOI = {10.3970/cmes.2012.089.143}
}