Бурение грунтовых зондов, установка энергетических колодцев

For the slant portion of the borehole, the forces acting on a unit section of the casing are presented in Fig. 4.5. The tensional load is controlled only by the type of operation, that is, pulling out or running in. At equilibrium, the differential equation is:

dFa

—JT — W(fb sm a + cosa) at

Solving Eq. 4.34 for tensional load while pulling out of the hole, yields:

Fa2 = Fai —W (li — l2) (fb sin ai + cos Qi) (4.35)

and while running in the hole:

Fi2 = Fai + W (li — l2) (cosai — fb sinai) (4.36)

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