In this paper we develop a higher-order nonlinear Schrodinger equation with variable coefficients to describe how a water wave packet will deform and eventually be destroyed as it propagates shoreward from deep to shallow water. It is well-known that in the framework of the usual nonlinear Schrodinger equation, a wave packet can only exist in deep water, more precisely when kh > 1.363 where k i...

In the downhole operation of horizontal Wells, pipe string is subjected to combined action many kinds loads. The may bend sinusoidal or spiral under axial compressive stress, which will also increase friction between and wellbore wall. Because existence friction, milling, salvage, unstuck, sand other construction bring adverse effects. This paper describes characteristics well in fishing, washi...