Abstract:

The bottom-hole assembly may be regarded as the continuous beam to which the axial force and the transverse force apply. This paper uses the elemental principle of least square method of weighted residuals compute the force on a multi--stabilized bottom hole assembly and to deflection，gives the theoretical formulas of computing the internal bending moments at stabilizer The side force on bit and the reactive force at stabilizer. In computing, this paper already considers the condition that the stabilizers are note in line.

Key words: Bottom hole assembly, Deflection of bottom-hole assembly, Side force on bit, Least square method of weighted residuals